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Erw (Electric Resistance Welded)

This ERW process refers to a specific welding process which involves both spot welding as well as seam welding. It is common for seam welding to be used in the manufacturing of round, square, and rectangular steel tubing. As soon as the steel strip is removed from the coil, it is side-trimmed to control its width as well as condition its edges so that they are ready to be welded. After passing through a series of contoured rollers, the material is cold-formed into a circular or square shape by passing them through a series of contoured rollers. 

Difference between ERW, DOM and Seamless Tube

This method involves pressing the edges together as butt joints under pressure, then heating the materials to temperatures above 2000 degrees Fahrenheit to fuse them together as one. The flash weld that has formed is now removed from the outside diameter of the tube so the tube will be straightened and cut to length once the weld is tested. The tube then passes through a series of sizing rolls in order to determine its exact size, following which the tube is straightened and cut.

In the process of manufacturing this product, SAE 1010 is typically used, and it can be made in Cold Rolled Steel (CREW) with 0.060” walls and lighter, or Hot Rolled Steel (HREW) with 0.083” walls and heavier. As soon as the product is manufactured, it will come in an “as-welded” condition (often referred to as a “flash-in” condition), referring to the flash of the weld being left on the inside of the tube and not being removed or controlled during the manufacturing process.

It is known that these stainless steel pipes are known as ERW pipes because they involve some of the most popular types of welding processes, such as spot welding and seam welding. These types of welding processes are most commonly used when manufacturing round, square, and rectangular stainless steel pipes. For welding, the stainless steel band is unwound from its coil and trimmed in order to control the width and adjust the edge. Having the strip pass through a series of shaped rolls that cold form the material into a circular (square or rectangular) shape, it is then ready. 

The edges of the pipe are joined under pressure in the form of butt joints and then the welding process is conducted by heating the material to over 2000 degrees Fahrenheit. During this process, the flash weld that has formed is removed along the pipe’s outer diameter. 

When the weld has been tested, it is then passed through a series of sizing rolls in order to obtain the exact dimensions, and then the stainless steel pipe is straightened and cut to the exact size required by the customer.

It is important to remember that during the manufacturing process, the weld state of the product (usually called the flash condition) usually means that when the weld flash remains inside the pipe, the ERW pipe will usually not be removed or the production process will be controlled in some way.

(Dom) Drawn Over Mandrel

Difference between ERW, DOM and Seamless Tube

Technically, DOM is not a type of steel tube, but rather a process by which it is finished. It’s considered a high-grade tube made from SAE 1020 or SAE 1026 steel, and is normally made of these materials. As part of the initial process of manufacturing, the tube is manufactured in a similar manner to electric resistance welded tubes, but in the finishing stages, the entire flash weld is removed and the tube is cold drawn over a mandrel in place of the flash wel. 

When formed by cold drawing, DOM tubing has nearly impossible dimensional tolerances (similar to threads), better surface finish, and the strongest welding strength. Cold drawn tubes are often misinterpreted as flawless when in fact, they have a seam (although it is virtually indiscernible).

This is a high-quality pipe that is considered to be a high-quality pipe despite the fact that DOM is technically not a steel pipe, but a stainless steel pipe that is completed. mandrel definition ,A similar process of manufacturing an electric resistance welded pipe occurs in the first stage of manufacture, but it is followed by a cold draw on the mandrel to remove the entire flash weld, resulting in a pipe that is in excellent shape, has the highest weld strength possible, and has the best surface finish. By using cold drawing, the pipe can be made with better tolerances, improved surface finish, and improved weld strength. 

When the DOM actually does have a seam (though barely visible), the hot dom is often incorrectly referenced as “seamless.”

Drawn Over Mandrel Tubing Manufacturing Process

When we make DOM, we start by cutting a large coil of steel into strips that are approximately the same width as the tubes we want to make. Once the strip has been cold-formed, tubing factory it is passed through an electric resistance welder to join the edges of the strip together, creating a tubular shape. Once the tube has been cleaned and annealed, it is then drawn through one or more dies and over the mandrel. By drawing the tube over the mandrel, you remove the weld seam from the inside diameter of the tube and leave a smooth, clean finish.

Benefits Of Drawn Over Mandrel Tubing

This type of tubing’s tight tolerances, its high concentricity and the superior surface quality on the OD/ID surfaces make it very cost-effective for cost-conscious organizations to use. Due to its tight tolerances, mechanical tubing can typically be used without extensive downstream processing, making the tubing very cost effective. 


Seamless Mechanical Tubing

Difference between ERW, DOM and Seamless Tube

The method of manufacturing seamless steel pipes is referred to as “extrusion.” During the process, a solid steel rod is passed through the center and a mold is used to make the solid circle into a circular pipe.

In terms of seamless steel pipes, there are basically two types to choose from:

It consists of cold drawn seamless define(CDS), which is typically produced by SAE 1018, and comes with highly precise tolerances and a good surface finish whereas hot formed seamless (HFS), which is usually produced by SAE 1026, has less critical tolerances and scales, but is not as strong as CDS.

There are certain advantages that can be attributed to the cold drawn seamless (CDS) method, including excellent surface finish, excellent processability, increased dimension tolerances, and high strength to weight ratio, while the seamless (HFS) method benefits from cost-effective materials, good processability, and a wide size range.

It is our mission to be a professional pipeline supplier, that is what we do. Our products include steel pipes (ERW steel pipes, seamless steel pipes, casing steel pipes,etc. ), fittings (e.g. elbows, bends, tees, caps, reducers, etc.) and flanges

Cold Drawn Seamless Manufacturing Process

CDS is produced from hot solid round billets that are pierced in order to create tubes that are subsequently rolled. In order to make sure that the tubes are accurate, they will need to be slowly cooled before passing them over a die and over a mandrel plug in order to be rolled and reduced in diameter.

Benefits Of Cold Drawn Seamless

In the process of manufacturing CDS tubing, tubing meaning the tube is able to be manufactured with higher physical properties, size accuracy, and improved appearance thanks to the CDS manufacturing process. Even though the tolerances for CDS tubing aren’t as tight as those for DOM tubing, this type of tubing can be manufactured with a much thicker wall than its counterpart, DOM tubing. As a result of the superior strength and hardness of this tubing, after the machining is completed to the part, the component looks a lot better. Many industries have come to appreciate the advantages of using CDS tubing.