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What is ERW pipe?
An ERW pipe is a steel tubular product that has been welded using an electric resistance welding process to join the material together permanently. Electric resistance welding involves heating the metal components with an electric current and melting them at the point of join.
How is ERW pipe made?
By cold-forming a flat sheet of steel pipe into a cylindrical shape, and passing a current through the edges of the sheet, the edges are fused together to form an ERW pipe. There are two main types of ERW pipes:
- High frequency welding
- Rotary contact wheel welding
High frequency welding
An A.C current is passed through the edges of the metal pipe parts in high frequency ERW welding, which results in better bonding and crack prevention than low frequency ERW welding, which uses a lower frequency A.C current. High frequency ERW welding is commonly used in the manufacturing of ERW pipes.
Rotary contact wheel welding
As part of the rotary contact wheel welding process, an electric current is passed through a contact wheel at the weld point, which applies some pressure in order for the welding process to be successful.
Types of Erw Pipes
Carbon Steel ERW Pipes
In order to create Electric Resistance Weld (ERW) carbon steel pipes, a carbon steel plate is rolled into the shape of the pipe and the seam is then electrically welded together to finish the pipe. The carbon steel plate is rolled into the shape of the pipe and the seam is then welded together.
As a leading enterprise in the industry, RatnaExports.com is renowned for pipe and steel industrial its ability to manufacture, export, stock, and supply a wide range of Carbon Steel ERW Pipes to its domestic and international clients. As we have procured this CS ERW Pipes range in the best raw materials, we are able to guarantee our clients that the offered range is of high quality.
In addition to being available in various specifications per industrial standards, the Carbon Steel Electric Resistance Welded Pipe range has a wide range of applications in the oil and gas industries as well as being available in a variety of sizes and thicknesses. As a result of our dedication to providing quality raw materials of both national and international standards, we are also able to deliver these CS Electric Resistance Welded Pipes in customized sizes and thicknesses tailored to meet the specific needs of our esteemed clients.
Stainless steel ERW pipe
A Stainless Steel ERW Pipe is a type of pipe which is manufactured by passing a high voltage current through the piping component to longitudinally weld it steel&pipe.These pipes are usually made with a maximum outer diameter of 609mm, in addition to having good corrosion resistance and oxidation resistance properties. The pipes contain a good amount of chrome, which makes them ideal for transportation of fluids and gases in a wide variety of applications. As far as you can tell, stainless steel EFW pipes are only produced through the high frequency welding process at high temperatures. At high temperatures, these pipes are usually used to join dissimilar welding pipes metal materials that need to be held together.
A welded stainless steel pipe is made by rolling strips of metal, followed by welding in place, using a standard welding procedure. These pipes are used in moderate to low-pressure systems and are available at a very competitive price, since they are suitable for moderate to low-pressure systems. The Schedule 40 Welded Stainless Steel Pipe is one of the most common schedules of pipe within this grade. It is possible to move and transfer moderate to low pressures through these pipes.
The Schedule 80 SS Welded Pipe, on the other hand, has a slightly higher pressure holding capacity than the Schedule 40 pipe, what does schedule 40 mean thus allowing metal tubes it to handle higher volumes of fluids and gases than the Schedule 40 pipe. In the construction of structural modules used in oil and gas applications, it is frequently the use of large diameter welded stainless steel pipes. These pipes are usually welded in ERW, SSAW, or LSAW processes. In a Stainless Steel Spiral Welded Pipe, an inert gas weld overlay is used to provide a continuous penetration through the metal in order to create a strong weld. Welding eliminates distortions that may occur in a component due to unbalanced stress that may result from normal welding procedures. We can customize our products in order to meet all customer requirements, as our esteemed workers have the expertise to do so.
ERW PIPE MANUFACTURING PROCESS
ERW pipes are manufactured from steel coils, which are uncoiled, then cut, drilled, processed, welded and tested before they are shipped to the end user, as can be seen in the picture below.
A common welding technique for oil and gas pipes is the so-called welding galvanized pipe “high-frequency induction technology” (ERW-HFI), a welding process that uses an induction current to produce a robust seam weld that is able to bind the two sides of the steel coil in a very tight manner. This process is accomplished by applying an induction current to metal water pipe the outside surface of the pipe.