Welding pipes at an angle of 45 degrees
When carrying out work on the installation of gas or water mains, it often becomes necessary to change the direction of the line, while the pipeline is cut and then welded at the desired angle. Most often, the direction changes by 90 degrees, and the question arises - how to cut the pipe at 45 degrees in order to accurately connect the joints when welding.
You can cope with the problem of cutting edge angles of 45 or 90 degrees if you have the appropriate knowledge and techniques that will help save not only time, but also materials during the work. At other rotation angles, it is impossible to solve the problem using a ruler and a sheet of paper; you will have to call computer technology for help.
Fig. 1 How to cut a pipe at an angle of 45 degrees
45 degree cutting
Typically, in order to rotate a pipe by 45 degrees, fittings and bends with a rotation angle of 45 degrees are used, made of the same material as the pipes themselves; if the pipes are steel, then the turns are welded from steel. For HDPE pipes, there are electric-welded or cast bends at 45 degrees (note that it is almost impossible to find compression fittings with this angle of rotation in Russia).
But, if you still need to cut a round pipe made of steel or various types of plastics, then for this you will need a pattern for cutting pipes at an angle, the shape of which is calculated manually or by machine. The task is greatly simplified if it is necessary to cut a square metal profile at an angle of forty-five degrees.
For quick cutting, you can use a regular sheet of paper folded diagonally to mark the surface for future cutting. When using folded paper, proceed as follows:
- carry out on a straight surface of the profile in the place where the cut is made, strictly perpendicular to the line;
- apply a sheet of paper folded diagonally to the side surface with the sharp end to the line so that the upper edge of the paper triangle is flush with the top side of the metal profile.
Rice. 2 Homemade template for cutting pipes at 45 degrees
- draw a line with a pencil along the side of the sheet at an angle of 45 degrees, after which the paper corner is applied to the other side and traced with a pencil (it is better to use a thin marker).
For sawing, you can use a grinder with a metal disc, first drawing a thin line along the marking, and then gradually deepening it until the edges are completely separated.
When working with an angle grinder, the following factor must be taken into account: if the edges are completely cut, the disk may be damaged by a sharp corner, which will lead to its failure, and in the absence of protection on the angle grinder, even to injury to the worker. Therefore, it is advisable not to cut the corner edges to the end, but to leave a narrow groove and then break them off, subsequently grinding the protrusion.
Making a template for cutting metal profiles
If you need to cut a large number of pipes, you can make a template from a metal profile of a larger diameter using a paper sheet using the above method. The angle of inclination is checked with a protractor or a construction square - in this case, the two edges of the cut parts of the template are connected.
When working, a template is placed on the part to be cut in the right place and pressed tightly, the markings are applied with a sharply sharpened scriber while tracing the template outline. The part is cut in several passes with a gradual deepening of the groove.
Rice. 3 Cutting a metal profile using a miter box
DIY miter box for cutting pipes
Using a template is not very convenient - you have to make a cut along the line, holding the grinder in weight, which leads to large errors. If you have a welding machine, you can make a simple miter box - guides for the grinder disk, preventing it from moving to the side.
To do this, use a previously made template, drill a hole in the side of which and weld a nut. When working, a homemade miter box is placed on the profile, a bolt is screwed into its nut and the device is pressed against the profile surface.
A grinder with a metal disc is used to make a cut, lightly pressing the disc against the side surface of the device. It is clear that with prolonged use, the edges in the miter box are gradually ground down, and although the process occurs simultaneously on all edges, some errors will appear over time.
Therefore, it is better to make the device from hard, wear-resistant metal in order to increase its service life and obtain a more accurate instrument.
Fig.4 Example of making a cut at an angle of 90 degrees
90 degree cutting
To cut a round pipeline or metal profile of rectangular cross-section evenly across, use a sheet of plain paper. They wrap the workpiece so that the edges of the paper sheet coincide, after which it is fixed to the part using tape or glue. Using a grinder, a thin line is drawn near the edge of the paper sheet, after which it is gradually deepened until it is completely cut out.
A metal profile or round pipe can be cut using a template by placing an evenly cut element with a large internal diameter on it.
Collar insert
To obtain branches of metal pipeline lines in the form of tees, a collar insert is used, for which it is necessary to cut the edge of a round pipe adjacent to the walls of another at a right angle. To implement the method proceed as follows:
- cut the edges of the workpiece at right angles using the previously described method.
- On the round end surface, a marker marks four equidistant points located at angles of 90 and 180 degrees to each other.
- The size of the circle is measured, the resulting diameter is divided by 3. The resulting distance is plotted from two diametrically located points, after which these points are connected to two others by a smooth arc, drawing a line with a marker.
Fig.5 Example of a collar section of a pipe
- According to the markings, a cut is made with a grinder and semicircular segments are separated, after which the part is ready for welding. If there are minor inaccuracies in the mating, it can be compacted with a sledgehammer, placing it against the round surface of another element.
Techniques for cutting round pipes at an angle
Round pipes of different diameters are cut at an angle when changing the direction of the pipeline, but it should be taken into account that a straight cut at the desired angle, unlike a rectangular section, will not lead to a tight connection of the edges. Therefore, special patterns are used in which the marked edge has a curved shape, which makes it possible to obtain a high joint density.
Paper pattern for pipe
One of the common ways to make a pattern for pipes with a round surface is a method for which you will need a lined sheet of paper, a ruler and a pencil. To obtain a paper pattern proceed as follows:
- Draw a circle on a piece of paper with the diameter of the pipe being cut, divide the circle into 16 equal segments, each time dividing large segments into two equal ones.
Rice. 6 How to cut a pipe at 45 degrees - paper pattern
- Measure the length of the circle by multiplying its diameter by the number Pi equal to 3.14. Lay this dimension on both sides of the axis of the circle in equal segments, each of which is divided into 8 equal parts.
- Draw vertical lines upward from segments on a straight line and horizontal lines from points placed on the circle.
- The places where they intersect are connected by a smooth line and, as a result, a template is printed on paper, which is cut out and glued to the surface to be trimmed. For trimming, it is better to use a grinder with a disk of small diameter - the surface will be curved and when using a large disk, the error will increase.
Tools used
There are several ways to cut a pipe; for this, construction and industrial tools for metal processing are used. Of all the types, only the grinder allows you to obtain curved surfaces without further processing with the closest arrangement of edges.
For individual use
The following tool is used for cutting steel pipes at home:
Manual pipe cutters. Allows you to cut round parts with an even, right angle of cut due to the cutting edges of the rollers. There are several varieties of products of this type, consisting of single rollers or a series of rollers attached to a chain. In everyday life, such devices are quite rare and are more suitable for professional work.
Source: https://respect-kovka.com/svarka-trub-pod-uglom-45-gradusov/
Methods for marking and cutting metal pipes
The use of [metal pipes] in the production and installation of metal structures involves the need for cutting across, along and at an angle. And you don’t always have special equipment at hand. We will describe in this article how to cut a pipe evenly using available tools.
Methods for cutting metal pipes at an angle
There are several ways to saw off a pipe or cut it into pieces. Of the available tools, a grinder is the best for this task. But the biggest problem remains the need to correctly mark the cutting lines. They can be different, most often you have to maintain either a right angle relative to the axis of the pipe, or 45 degrees. The techniques vary somewhat depending on what products need to be cut:
- pipes for laying water supply, gas and for heating distribution;
- profile products for assembling gates, canopies, and other metal structures;
- large-diameter pipes - as a rule, this is rarely needed at home, where the widest clearance is only in the sewer system;
- pipes made of steel, cast iron, thin-walled of non-ferrous metals and soft alloys.
Both problems can be solved quite simply even without the use of a special pipe angle pattern.
IMPORTANT TO KNOW: Steel water and gas pipe
We cut the pipe at an angle of 90 degrees
To mark the cut [of water and gas pipes] at a right angle, you can use a sheet of standard A4 paper, wide electrical tape or construction tape. If you wrap a wide enough material around the pipe so that the edges line up exactly when applied, you will get a perfect cutting line. If the tape or tape is firmly stuck to the metal, you can go right along the edge.
It is important to be able to use the grinder correctly, hold it with a certain force and follow safety rules. The technique described is the simplest; it is also suitable for cutting a large diameter pipe.
We cut the pipe at an angle of 45 degrees
Most often this has to be done when installing plumbing and heating and assembling frame structures. You can cut the pipe at 45 degrees with a grinder according to the markings, which are made either with a sheet of paper of the same A4 size, or using a regular school (drawing) isosceles square.
Use a sheet of paper or cardboard
You will have to do several operations with the sheet to get the desired angle. If you don't want to get confused with the folds, just make it square and fold it diagonally to get the angle you want. The same can be done with any sheet, as long as its sides are equal to each other. The method is convenient in that it can be applied to both large-diameter pipes and [profile pipes of square and rectangular cross-section].
IMPORTANT TO KNOW: Profile stainless pipe
Marking with a square
If you have a square at hand, you must first determine the exact line of the end of the pipe, including the profile one. By applying the tool and smoothly moving it along the surface, we get a cutting line of 45 degrees. The same technique is used with a 30 degree square.
How to properly cut pipes from different metals
Accurate cutting and trimming of pipes depends not only on well-executed markings. The material is also of great importance - metal of different thicknesses and hardness is cut with different forces and side effects. To properly cut a cast iron pipe, it should not be sawed all the way through. Cast iron is a brittle metal, so several cuts are usually made, and then a specialist knocks a piece out of them with one precise blow of a chisel.
To work with thin-walled pipes, you will have to very accurately check the position of the grinder. At the same time, the master must choose the right [discs for cutting metal with a grinder]. In industrial settings, special pipe cutters, gas cutting machines and welding machines can be used to perform the same tasks.
IMPORTANT TO KNOW: Seamless cold-formed pipes
Safety when cutting a gas pipe
When working with gas pipes connected to the mains, it is important to follow safety precautions. First turn off the gas supply valve, then make sure that there is nothing in the pipe. To do this, just open the stove burners and light the gas - when it runs out, the flame goes out.
Source: https://rezhemmetall.ru/sposoby-razmetki-i-rezki-metallicheskix-trub.html
How to cut a round pipe at an angle
Precise pipe cutting looks simple at first glance. This task is quite problematic, especially if you need to make a cut at a certain angle or a cut of a complex configuration. You can do this either with your own hands or with the help of a specialized tool.
Much here depends on the diameter of the product, the wall thickness, the material from which the pipe is made and, of course, the tool itself.
What tools are there?
Pipe cutting tools, like most existing tools, come in manual and electric versions. Both of these niches, in turn, contain specialized professional and applied amateur tools (find out here how to cut threads on a pipe at home).
For example, the question of how to cut a metal-plastic pipe can be solved in two ways.
On the one hand, there is a professional pruner, but on the other hand, you can use a regular hacksaw.
- If we talk about pipes made of various types of plastic, then for material with a cross-section of up to 75 mm, a lot of special scissors are produced; professionals call them pruning cutters . Since plastic material is quite dense, all pruners are equipped with a gear mechanism that serves to increase the compression force. The price for such scissors starts from $10 and, depending on the quality, can reach up to $150.
- The next professional in cutting plastic is the disc pipe cutter . If the pruner works on the principle of ordinary scissors, then the cut is made using a sharp, heavy-duty disc. He presses himself against the wall and, rolling around it, makes an incision.
A pipe cutter is indispensable for thin-walled products, since cutting a metal-plastic pipe with a thin wall with pruning shears is difficult because it wrinkles.
- The question of how to evenly cut a large-diameter pipe is easily solved by professionals; for this purpose, there is a guillotine adapted for cutting round products . Its operating principle is classic, with a knife on top and a semicircular bed on the bottom.
The device can be electrically driven and cut using hydraulics. There is also a guillotine with a manual, screw drive.
- In addition, there are a lot of specialized machines . Thus, lathes are used for perpendicular cuts. If the question arises of how to cut a pipe at 45 degrees or at any other angle, then, as a rule, band saws are needed.
Important: the main difference between a professional tool and an amateur one is that the cut is performed with extreme precision. Plus, the edge does not require additional processing after finishing the work.
- But the necessary device is not always at hand, and buying it separately is expensive and does not always make sense . The leader among amateur tools is considered to be an ordinary hacksaw. It can easily cope with both metal and plastic, the main thing is to mark it correctly, but more on that later.
- Every good owner always has an angle grinder . With its help, having a certain skill, you can quite accurately unravel pipes of small and medium diameter. The big advantage of the grinder is that it can be used to work on any material, from polyethylene to cast iron or steel.
- At the end of our rating is a jigsaw. It is undoubtedly possible to work with it, but it is difficult to make precise cuts, plus the edges of the pipe will need to be further refined.
Some tips for cutting pipes
Using a tool such as a pruning shear or a disc pipe cutter does not require special training; it is easy to work with them efficiently. It's a completely different matter when you have to use improvised means.
Making a perpendicular cut
There are several opinions on the topic of how to cut a pipe at 90 degrees. As in any business, a lot depends on the correctness of the markings. The most reliable folk method is to use a paper sheet or masking tape.
It is easier to work with tape; you need to carefully, without creases or distortions, stick it around the perimeter of the pipe. If both sides of the strip meet clearly, without shifts, then you already have 90º.
The product must be securely fastened before cutting, otherwise the pipe will rotate and you will not be able to unravel it smoothly. Ideally, of course, it is better to clamp it in a vice, but at the dacha you don’t always have such luxury. A small diameter pipe can be tied to a stool or table.
To a large-diameter product, you need to attach 2 wooden support bars in parallel, which will prevent the pipe from rotating. It is most convenient to fasten with tape; a few turns made on both sides of the cut will securely fix the product.
Advice: before cutting the pipe evenly with a grinder, in some cases it is better to fasten it only on one side, leaving the other hanging. You need to cut from top to bottom to avoid pinching the disc.
Returning to how to cut a large-diameter pipe, it should be noted that with a hacksaw or grinder, such a product should be cut into sectors, gradually.
In the case of a cast iron pipe, the instructions are slightly different:
- It is necessary to make a shallow cut around the perimeter;
- After this, use a chisel and hammer to “tap” this cut;
- At a certain point, the pipe should burst according to the markings.
Oblique cut
In this topic, the most pressing question is how to cut the pipe at 45 degrees. Among the folk methods, there is a unique way of marking: you need to take a square sheet of paper and carefully fold it in half diagonally, after which it is wrapped around the pipe with the folded side. The ends of the sheet should be connected, and the oblique border of the sheet will be the 45 degree mark.
Another alternative method is to use a basin of water. The pipe is lowered into the water at the desired angle. The boundary between dry and wet areas is marked and a cut is made.
But the most famous, simple and convenient device for corner cutting is the miter box. This tool is a U-shaped product consisting of strips. The two opposing planks have precise cuts at the desired angle. The pipe is placed inside the miter box, secured and cut with a hacksaw according to the ready-made markings.
Source: https://stroyka.ahuman.ru/kak-otrezat-krugluju-trubu-pod-uglom/
How to cut a profile pipe at 45 degrees
When installing a pipeline, it is often necessary to cut the pipe at a certain angle. Accuracy plays a big role in this task. There are several simple ways to cut a pipe at an angle.
An incorrect pipe cut will make it impossible to install the structure of the shape that was originally intended. For example, if you plan to rotate the system by 45 degrees, then it is necessary to cut the pipe at 45 degrees. To complete the task, you will need marking tools and a grinder (it can be replaced with a hacksaw).
Marking a corner with a piece of paper
Marking with a paper sheet is one of the simplest ways to complete the task. A square sheet is required. It folds exactly diagonally. The resulting template for cutting pipes must be wrapped around the product so that the long side runs parallel to its cross-section.
Then an angle of 45 degrees is formed on the smaller side. All that remains is to mark the cut line using a construction pencil or marker on a sheet of paper.
It is recommended to wrap the marking area with narrow tape to prevent it from being accidentally erased. This method is excellent for long, large pipes with the cut location approximately in the middle of the product.
Method of marking using a container of water instead of a pattern
This marking method is suitable for small-diameter pipes that are planned to be cut at a certain angle close to the edge. First you need to prepare a deep container of water. The planned angle of inclination is marked on it. Now you need to carefully immerse the end of the product in the liquid, tilt it towards the mark, and then pull it out.
As a result of such actions, a clear line of contact with water will appear on it; it needs to be highlighted. The pipe is cut along it at an angle. This method is best suited for jobs that require multiple markings.
Using the computer program
To implement this method of marking pipes for cutting, you will need a computer with special programs. First, you need to draw up a drawing that shows the transverse dimensions of the product, as well as the planned cut angle. You need to get a virtual template.
Source: https://morflot.su/kak-razrezat-profilnuju-trubu-pod-45-gradusov/
Cutting pipes at an angle: advantages and disadvantages of different methods
07.12.2018 10:52
During installation and plumbing work, it is often necessary to cut workpieces at a certain angle. Changing the direction of the cut line is necessary for further joining and welding with other pipes of the same configuration, or for installation of shut-off and control valves.
It is worth considering that precision cutting at the desired angle is necessary to obtain a high joint density of rolled metal. To do this, you need to have the necessary equipment, a high-quality pipe cutter and have relevant experience in carrying out pipe processing work.
In this article we will look at techniques for cutting pipes at various angles.
1. Methods for marking pipes at an angle of 45 degrees
Cutting pipe blanks at an angle of 45° is most in demand when installing heating mains, sewer networks, and gas pipeline systems. For these purposes, pipes made of ferrous metals and stainless steels of cylindrical cross-section, small and medium diameter - 20-500 mm are used.
One of the main tasks when cutting pipes at an angle of 45 degrees is the accuracy of measuring the angle and the evenness of the pipe cut, so that when joining, the joined elements coincide with an accuracy of a millimeter. This is especially true for thin-walled pipes - with the slightest cutting error, the walls of the connected pipes will not be able to connect in the desired configuration. Therefore, close attention must be paid to cutting accuracy.
Marking round pipes
If you don’t have a production template, you can use a pattern made from a square paper sheet. To mark the pipe, perform the following steps:
- Fold the square sheet strictly diagonally, aligning opposite corners. The length of the diagonal of the pattern should be equal to the circumference of the workpiece.
- The folded sheet is wrapped around the pipe.
It is important to ensure that the side of the pattern located closer to the end of the workpiece is strictly perpendicular to the central axis.
- Dotted markings are made at the location of the future cut.
- Next, the pipe is cut.
Important! When considering cutting methods, it is necessary to take into account the material of the pipes. It is easier to cut copper and steel blanks with a diameter of up to 65 mm using paper patterns.
To mark thick-walled steel pipes of large cross-section, it is better to use paronite templates.
Marking square and rectangular pipes
To make a pattern for marking a profile pipe, it is more advisable to use a similar blank only with a larger cross-section. Marking on the workpiece is performed once using an engineering ruler or protractor. A profile is inserted into the cavity of the finished template, marking is carried out and subsequent cutting is carried out.
2. Marking pipes at an angle of 90 degrees
Marking the pipe at a 90 degree angle is quite easy. If necessary, you can use a sheet of paper: the sheet is wrapped on the pipe, secured and marked. It is important to ensure that the edges of the sheet coincide along the entire circumference, then the cut will be even.
How to cut a profile pipe at an angle of 90 degrees?
To cut square or rectangular pipes, it is preferable to use a triangle. This device alternately marks with a marker on each side of the profile. After drawing the dotted line, the pipe is cut.
3. Marking pipes at other angles
To cut pipes at angles of other values, you will need patterns with the appropriate values. You can prepare a template using Excel or other computer programs by entering the values of the pipe diameter, desired angle, etc. in the appropriate interface.
In calculation programs, you can calculate the cutting of pipes of any diameter and at any angle. But most often this method is used to create patterns for cutting pipes of small and medium diameter. For cutting large diameter pipes and in large volumes, it is preferable to use programmable cutting machines.
How to cut a pipe using the collar method?
Often, when installing water supply networks, pipe blanks are required that have a cut at the end in the form of a triangle. This pipe configuration is necessary to connect to another round pipe at a right angle.
To perform a collar cut proceed as follows:
- The circumference of the pipe is measured.
- The pipe is cut at an angle of 90 degrees.
- At the end of the pipe, equidistant points are marked, which are located at angles of 90 and 180 degrees relative to each other.
- Calculations are performed: the diameter of the pipe is divided by three.
- The resulting value is plotted from two diametrically located points and marked with dots.
- These points are connected to other smooth arcs.
- After cutting with a pipe cutting tool, semicircular segments are separated, which are ready for subsequent welding work.
How to order a pipe cutting tool
For advice on the selection of equipment for pipe cutting, please contact our managers:
Source: https://obrabotkatrub.ru/articles/rezka-trub-pod-uglom.html
How to cut a pipe at an angle
When installing a pipeline, quite often you have to cut the pipe at an angle. Moreover, the angle should have exactly the degree that is needed for the structure.
If the angle is made incorrectly, it is impossible to produce exactly the dimensions of the pipeline that were supposed to be made. For example, the pipe will rotate 45 degrees during installation, therefore, you need to know how to cut the pipe at 45 degrees.
To do this we need marking tools, a grinder or a hacksaw.
Marking using a sheet of paper
One of the easiest ways is to mark the corner using a sheet of paper. We fold the square sheet strictly diagonally. We take the pipe and wrap it with a folded page so that the edges of the diagonals are opposite each other.
So, on the smaller side of the page we have an angle of 45 degrees. We take any marking tool and mark the location of the future pipe cut along the line of the page. To prevent the markings from being accidentally erased, you can use narrow tape.
This marking method is convenient for a long pipe of enormous diameter, and the cut point of which is somewhere in the middle.
Using a water container
What should we do if we are dealing with a small-diameter pipe, and we need to cut the pipe at an angle somewhere near the edge? A deep container filled with water will come to the rescue. Before you start working, you need to calculate the angle of inclination and make a mark on the container.
Then all we have to do is carefully lower the edge of the pipe into the water and tilt it towards the mark on the container. We remove the pipe, mark the line of contact with the water, and boldly cut along the markings. This method is optimal when marking a huge number of pipes.
A ready-made template from a container of water will speed up the process of our work.
Computer program to help
I would also like to consider the method of marking using a computer program. This is a super complicated method for those who are not used to working with a computer. It requires knowledge of a PC, programs for developments and drawings. We begin work by making a drawing indicating the size of the circle and the slope. We make a so-called virtual template.
Source: https://moy-instrument.ru/podelki/kak-sdelat-srez-truby-pod-uglom.html
How to properly cut a pipe at 45 degrees: tools
In various situations, home craftsmen often come to the question of correct marking for precise cutting of pipe blanks at an angle of 45 degrees. Today there is a huge selection of tools for both domestic and industrial cutting of pipes at any angle. The cost of such devices can be quite high.
How to cut a pipe at an angle
It is proposed to consider methods for marking workpieces for cutting at an angle of 45 degrees in domestic conditions without the use of expensive professional equipment.
Marking and cutting the pipe
Pipe Angle Cutting Tool
The process of marking the workpiece to be cut seems quite simple. But it should be noted that roundings made during the manual marking process will create an irreparable error after cutting, which will lead to inconsistencies and the formation of defective products.
In order to eliminate such defects, it is necessary to make a simple tool for clearly marking the profile parts.
At the same time, cutting products at an angle of 450 is much easier. A regular piece of U-shaped steel profile, made at an angle of 45 degrees, will be a reliable tool for accurately cutting pipes.
In this case, the size of the profile for the ruler must be selected so that it becomes possible to easily position the profile pipe to be cut in it.
Manual pipe cutting tool
To perform such a tool marking the correct angle, you must have the following additional tool:
- Goniometer;
- Metal scriber;
- Bulgarian;
- Cutting disc;
- File.
Device for cutting pipes at an angle How to cut a pipe at an angle correctly
Making a measuring tool for cutting pipes is easy. To do this, it is necessary to cut a segment 20-30 cm long from a profile blank. Using a protractor, mark an angle of 45 degrees at any end of the segment. Next, use a grinder to cut off the profile. The resulting template must be tested for accuracy.
In case of deviations, process the measuring device with a file.
Using such a home-made marking tool makes the process of cutting pipes much easier, especially if they are large in volume.
To mark, you just need to place the profile pipe to be cut in the made device and draw the correct angle using a scriber. During the marking process, the length of the products is controlled. Next, you need to cut the pipe clearly along the marking lines using a grinder.
It is worth noting that first the pipe is cut along diagonal marks on both sides, then straight marked lines are cut. Such templates for cutting pipes at an angle of 45 degrees will save enough time and money.
Marking and cutting round pipes
Pattern for cutting pipes at an angle; pipe pattern at an angle of 45
When cutting round pipes at a 45 degree angle, a tool made for rectangular pipes is not quite suitable. For a more accurate, streamlined drawing of the cutting line at an angle, it is recommended to use a paper pattern that is wound on the workpiece.
Patterns are developed in the modern world using computer programs.
The cutting line changes depending on the angle and pipe diameter specified in the program. Common patterns can be found on the Internet or you can remember our painted rulers from school.
Source: https://o-trubah.com/montazh-i-remont/razrezanie-trub-pod-uglom-45-gradusov/
How to cut a pipe at an angle - marking options for round and profile pipes
:
When installing a pipeline, it is often necessary to cut the pipe at a certain angle. Accuracy plays a big role in this task. There are several simple ways to cut a pipe at an angle.
An incorrect pipe cut will make it impossible to install the structure of the shape that was originally intended. For example, if you plan to rotate the system by 45 degrees, then it is necessary to cut the pipe at 45 degrees. To complete the task, you will need marking tools and a grinder (it can be replaced with a hacksaw).
Technologies for welding fixed pipe joints
Careful execution of preparatory work, which can usually take up a significant portion of working time, is the most important element of any type of work activity. Welding fixed pipe joints is no exception.
First you need to clean the connected elements from paint, rust, etc. This happens through mechanical processing. Cutting the blank element can be done either with a power tool or using a thermal method. The blanks must be combined with each other.
In order to fix the elements, tacks are applied, which look like light welding seams. Their parameters are based on the size of the connected pipes. Welding technology requires that all metal parts of the welding device be grounded. The transformer frame and table are also subject to grounding.
The coating of the wires and cables of the welding machine must be insulating.
There are three directions that determine the basic technologies for joining metal parts by filling the spaces between them with molten metal:
- Horizontal;
- Vertical;
- At a 45 degree angle.
The angle of inclination of the electrode during welding. A - angle for vertical welding; B - angle for horizontal welding
The choice of a specific technology depends on the following factors:
- placement of pipes;
- tilt angle during the welding process;
- thickness of the pipeline wall layer.
If the pipe wall thickness reaches 12 mm, the metal parts are connected using a three-layer seam. Each layer should not be more than 4 mm in height, and the width of the bead should not go beyond 2-3 times the diameter of the welding electrode.
Welding rotary pipe joints, unlike non-rotary ones, is easier to implement. It allows you to turn the pipe in the desired direction when necessary. This helps prevent the creation of complex seams (ceiling and vertical).
Welded pipe joints: a – rotary, b – fixed
Method of working with a horizontal joint
The method of dealing with fixed pipeline joints in a horizontal position differs in that it is not necessary to completely cut the edges. These actions must be carried out using medium arc welding. You can only maintain an insignificant 10-degree cut.
Such actions ensure an improvement in the process of joining metal parts and maintaining their quality at the same level. It is better to weld horizontal pipeline joints in separate, narrow layers. The root of the seam is welded with the first roller, using electrodes 4 millimeters in diameter.
The force limit according to Ohm's law should be set in the range from 160 to 190 A. The electrode receives a characteristic reciprocating movement, while a thread-like roller 1-1.5 mm high should appear inside the joint. The coating of layer No. 1 must be thoroughly cleaned.
Layer No. 2 is made in such a way that it covers the previous layer when the electrode moves in a reciprocating manner and when it swings almost imperceptibly between the edges of the upper and lower edges.
Table of the ratio of welding currents depending on various indicators
The direction of the second layer is no different from the first. Before performing the third layer, the current must be increased to 250-300 A. To make the process of joining metal elements more productive, you need to use electrodes with a diameter of 5 millimeters. The direction of cooking of the third layer is opposite to the directions of the previous two layers.
The third roller is recommended to be performed at higher settings. The speed must be chosen so that the roller is convex. It is necessary to cook at a “back angle” or at a right angle. The third roller should fill two-thirds of the width of roller #2. The fourth roller should be performed in the same modes as the third roller.
The inclination angle of the electrode is 80-90 degrees from the surface of the pipe, which is located vertically. The direction of the fourth roller remains the same.
The technology for performing electric welding with horizontal joints in the presence of more than 3 layers has its own peculiarity: the third layer with all subsequent ones are performed in directions, each of which is opposite to the previous one. Pipes reaching a diameter of 200 mm, as a rule, must be welded with continuous seams. The reverse-step method is typical for the welding process of pipeline joints with a diameter of more than 200 mm. It is recommended that each section be approximately 150-300mm long.
Methodology for working with vertical pipeline joints without turning
The process of electric welding with vertical joints is similar to the process of working with horizontal elements. It must be carried out using short arc welding. The main difference is the need to regularly change the angle of the electrode, while simultaneously viewing it relative to the perimeter of the seam. The technological process of carrying out this type of welding is determined by the following main blocks:
- You need to “cook” the root seam in two passes. In the process of setting up the second roller, layer No. 1 must be melted - this ensures the quality of the root weld. The size of the pipe wall and the size of the gap between the connected components directly affects not only the pace of the process, but also the amount of current.
- The edges must be filled at a fairly high speed, while the electrode position is used at a "back angle" or 90 degrees.
- Locks of adjacent layers are carried out taking into account a shift of 5-10 mm. The length of the “lock” directly depends on the diameter of the pipeline.
- The flatness of the resulting surface largely depends on the welding rate; the facing layer is fused using narrow beads.
Sequence of seams for non-rotary welding
Welding a pipeline at a 45-degree angle
When performing this type of welding, the weld seam is located at a certain angle. It is formed only when a significant number of actions are carried out with the electrode: changing the direction of welding; changing the angle of inclination.
This is the main feature of this type of welding, which, in turn, requires a certain level of professionalism and universal skills from the performer. This requirement especially applies to pipelines with high requirements for the tightness of welded elements.
It is important to remember that the choice of technology for welding a pipeline at an angle of 45 degrees directly depends on the diameter of the pipes being welded:
- Gas pipes up to 200 mm in diameter need to be “cooked” in several layers in a row. For this purpose, during operation, the pipe is smoothly rotated as the weld seam is filled.
- When working with other types of pipes up to medium sizes in diameter, their circumference is divided into 4 segments and they are welded sequentially. After deposition of the metal of the first two segments, the pipeline is turned half a turn, after which work continues.
- The circumference of the pipe should be divided into a larger number of segments if work is carried out on a pipe of significant size (from 50 cm). The size of the segments should be from 150 to 300 mm.
Source: https://samsvar.ru/stati/svarka-trub-pod-uglom-45-gradusov.html
How to cut a pipe at 45 degrees
When carrying out work on the installation of gas or water mains, it often becomes necessary to change the direction of the line, while the pipeline is cut and then welded at the desired angle. Most often, the direction changes by 90 degrees, and the question arises - how to cut the pipe at 45 degrees in order to accurately connect the joints when welding.
You can cope with the problem of cutting edge angles of 45 or 90 degrees if you have the appropriate knowledge and techniques that will help save not only time, but also materials during the work. At other rotation angles, it is impossible to solve the problem using a ruler and a sheet of paper; you will have to call computer technology for help.
Fig. 1 How to cut a pipe at an angle of 45 degrees
Cutting pipes at an angle: pros and cons of different methods
Among branded devices that could be used in everyday life to make cuts at an angle, you can pay attention to Italian-made equipment. The Mini Cut band saw from the MASS company is a small-sized device with manual clamping, for working not only with pipes, but also with angles, rods, and profile elements.
A convenient and productive device for cutting pipes of small and medium diameters. The cutter is made on the basis of a steel strip, which can be installed to make cuts at an angle
The machine supports setting the cutting angle from 0 to 45º. The procedure is carried out using a tape at a speed of 45 reciprocating movements per minute. The device is equipped with a 370 W electric motor, which is powered from a household network. The maximum permissible diameter of a round pipe to be cut is 65 mm.
Oblique cut
In this topic, the most pressing question is how to cut the pipe at 45 degrees. Among the folk methods, there is a unique way of marking: you need to take a square sheet of paper and carefully fold it in half diagonally, after which it is wrapped around the pipe with the folded side. The ends of the sheet should be connected, and the oblique border of the sheet will be the 45 degree mark.
But the most famous, simple and convenient device for corner cutting is the miter box. This tool is a U-shaped product consisting of strips. The two opposing planks have precise cuts at the desired angle. The pipe is placed inside the miter box, secured and cut with a hacksaw according to the ready-made markings.
Source: https://ManRem.ru/rezka-trub-uglom-plyusy-minusy-raznykh-sposobov/
If the pipe is profiled
But, for example, we have a profile pipe, not a round one. Manual marking of a profile pipe can lead to a huge error. The best way out of this situation would be to make a template from the same profile of a larger diameter.
Take a small piece of profile pipe and use a protractor to mark an angle of 45 degrees. We cut along the markings with a grinder and grind the edges so as not to get hurt by the burrs while working.
Then all we have to do is insert a profile of a smaller diameter into the template and, having made markings, cut it off.
In this article we looked at how to cut a pipe at 45 degrees. Using one of the methods listed above, mark and make a cut. For a more even cut, it is better to use a grinder. When cutting by welding, experience is required, otherwise the cuts will end up with unevenness. As a last resort, you can use a hacksaw. Currently, there are a large number of different devices for cutting pipes at an angle on sale, but purchasing them requires extra costs. It’s easier and cheaper to make a template for yourself once and use it as needed.
That is why the video will show you how to cut a pipe at an angle of 45 or 90 degrees using a computer program:
Cutting a profile pipe using a pipe cutting device at forty-five degrees:
Source: https://uchebniksantehnika.ru/truby/kak-razrezat-trubu-pod-45-gradusov.html
How to cut a pipe evenly with a grinder at 45 and 90 degrees | Cutting methods
When working with construction or plumbing tasks, you need to know how to cut a pipe evenly with a grinder. In this article we will look at quick and easy ways of how to properly cut a pipe with a grinder so that the result is perfect.
Cutting pipe at an angle of 45 and 90 degrees
If you need to cut a pipe at an angle of 45 degrees, which is often required when laying water and heating pipes. Often steel and cast iron pipes that have a cylindrical shape are used. In installation work, rectangular or profile pipes are used. However, you should cut the pipe correctly with a grinder so that you can easily connect it later. Therefore, you should carefully mark the pipe.
Some craftsmen try to mark the cutting area using a tape measure, but we warn you that the result will most likely be negative. And for a positive result, consider the following recommendation from professionals.
Take a sheet of paper or cardboard, preferably A4, fold it diagonally and wrap it around the pipe where you plan to make an even cut. The edges of the paper must be absolutely aligned with each other. And the side of the paper that is closer to the end of the pipe was perpendicular to the axis. Then mark a cutting line in a circle.
If you need to cut exactly at an angle of 90 degrees, then solve the problem quickly using paper or masking tape. Wrap it around the pipe so that the ends match. Make an even mark and saw off.
How to cut a profile pipe evenly?
Craftsmen advise using a square when cutting a profile pipe. To do this, apply the square to the sides one by one, and turn and apply marks with smooth movements. After the steps, secure the pipe and cut. Prepare yourself a template that will be useful in the future and will save time. It is better to carry out the action with a grinder, so the cut will be smoother.
How to cut a cast iron pipe?
When working with cast iron pipe, keep in mind that it is a fragile material. Therefore, we will find a way to cut such metal without damage.
Before starting work, make notes for the cut, as you would when working with steel pipes. Place a wooden beam for support. Run a grinder around the circumference of the pipe, making small cuts. Then take the chisels, insert them into the groove and hit them hard with a hammer. Please note that Bakelite-based cutting discs are used to cut cast iron pipes.
If you don’t have a grinder at hand to cut a cast-iron sewer pipe or other purposes, use a hacksaw, chisels or special pipe cutters.
How to cut a gas pipe?
Cutting a gas pipe is a dangerous action, so it is best to leave it to professionals. But if you are confident in your abilities, then use a grinder, welding, hacksaw, or gas welding to cut metal.
Trimming instructions:
- Before work, turn off the gas supply riser. Then release the rest of the gas from the pipe. To do this, light the gas in the burners and wait for it to go out.
- After these steps, cut. Using a welding method, the metal base burns when exposed to high temperature. The result is fast and effective. But remember that cutting or rooting gas pipes again requires experience.
Methods for cutting large diameter pipes
For cutting large diameter pipes, such as sewer pipes, there are a number of reliable tools available. Next, let's look at some of them in detail:
- The grinder is an inexpensive and accessible option, but it is considered not the safest when working with such materials. If you decide to use this method, be careful and use protective equipment.
- A roller machine (pipe cutter) is a tool adapted for such manipulations. The device is attached and material removal begins. The clamping force is adjusted using mechanical devices. It is important to note that machine models differ in shape, so before use, consider the size relationship with the pipe.
- Gas cutting is the most popular option for cutting larger diameter pipes and sheet metal. The cut occurs due to the action of a high intensity flame, the metal melts and leaves the cut zone with a gas flow. This method is convenient and effective.
How to cut a pipe lengthwise correctly?
A quick way to cut a pipe lengthwise using a grinder:
- Pay main attention to the markings.
- For this case, use painting thread, which is widely used when marking walls.
- Before starting work, secure the pipe and, using small movements, carefully saw the pipe.
- It’s better not to rush, but delicately and slowly process the parts of the pipe, so that the cutting disc does not jump off the marking lines. Remember safety precautions.
How to cut thin-walled pipes?
Thin-walled pipes are made of non-ferrous metals: aluminum, copper. Such work should be done delicately, as there is a high probability of deformation of the material. For cutting, fillers such as sand are used. Actions can be carried out using a grinder or a special machine.
To summarize, we emphasize that cutting metal pipes is a complex process, but every willing craftsman can improve it. Using the advice of professionals, you can easily cope with cutting pipes of various sizes and materials.
Also, do not forget to process the edges of the pipes after cutting with a file or sandpaper. And the most important thing to remember when starting such actions is safety precautions. When starting work, wear a special suit (casing), mask or closed-type glasses.
Your hands should also be reliably protected from sparks, so use thick gloves.
Source: http://UkrAbraziv.com.ua/novosti/43-kak-rovno-otrezat-trubu-bolgarkoj
