ERW stands for Electric Resistance welded pipe. A plate rolled to become a pipe and welded using Electric Resistance Welding process. Usully for for high diemeter. (cheapest process avaiable)
ERW tubing or Electric Resistance Welded tubing is not as strong as DOM tubing or Drawn Over Mandrel tubing. Usually when tube is made, it starts off as a flat sheet and this is rolled up into a tube and welded. DOM tubing is usually made the same way but there is an extra process where this tube is drawn through a die along with a mandrel to control the outer and inner diameters of the tube. This extra process strengthens the steel since it is cold formed by up to 20%. Another type of common tubing is Chrome-Moly also known as Chromium / Molybdenum Steel. This type of steel also uses the same process but has these additional elements within the steel alloy which increase strength even more. Chrome-Moly is usually used in tubing for cars and other applications over 3500 lbs.
Motorcycle Frames and ERW Steel Tubing...
Motorcycle frames are made with both ERW tubing and DOM tubing. For small engines with not a tremendous amount of horse power a 1" x 1/8" mild steel ERW tube should be fine. Modern engines with a lot more horsepower as well as stretched frames require at least 1 1/4" x 1/8" wall thickness at a minimum. Bigger choppers even use 1 3/8" x 1/8" walls. More on the overkill side done for design or aesthetics is 1 1/2" tube with 1/8" wall. All applications under 3500 lbs pretty much can get away with using ERW. Roll cages and dune buggies, car frames are almost always made with DOM tubing.
All three, Chrome-Moly, DOM and ERW tubing weigh about the same but it is important to note that Chrome-Moly is the strongest, followed by DOM and finally ERW being the weakest of the three. You can take advantage of this by replacing a larger diameter tube with a smaller diameter tube of stronger material. For example, you can replace a 1 1/2" ERW tube with a 1 1/8" DOM or Chrome-Moly tube.
The advantage here is that you can reduce your frame weight by making such a change. It is very critical to confirm that it is ok to make this kind of change on your frame. Each frame has a different geometry and different loads that will bend and twist the steel in various ways. Finite Element Analysis (FEA) conducted by a qualified engineer can provide you with correct tube diameters and wall thickness that can be replaced for your specific frame design.
ERW has the weld seam on the inside of the tube (see image above). DOM, although made the same way has the additional process of being drawing and the mandrel removes this seam and provides a nice smooth surface on the inside of the tube.
The image and diagram is courtesy of the fabricator.
They have many uses in industry from making motorbike frames to large machinery.
ERW: Electric Resistance Welding tube - tubes are rolled and joined With welding - fin cut is there CRW: Cold Drawn tube - without fin cut - Draw process
Sch 40 electric resistance welded pipe is generally used for utility lines such as compressed air and water lines.
A CEW pipe stands for a cold drawn electrically wielded pipe. Pipes can be made in a number of ways. One such method is to make pipes from sheet steel. The sheet is cut to the required width and rolled along the length. The ends are to be joined so that is forms a pipe. When they are welded using resistance then they are called ERW pipes and when they are electrically welded they are cold drawn electrically welded pipes or CEW pipes.
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
ERW (Electric Resistance Welding) pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; hence ERW pipe has a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.
low pressure lines
ERW pipes are round pipes welded from steel plates with longitudinal welds. It is used to transport oil, natural gas and other vapor-liquid objects, and can meet various requirements of high and low pressure. Shashwat Stainless Inc. is a premier ERW pipe manufacturer in India. ERW pipes manufactured in Shashwatβs plants, surpass all national and global quality standards, leading to their international acclamation. The company is a reputed ERW pipe supplier and ERW pipe exporter, based in Mumbai. Contact us! Phone: +912267437930 Address: 52/52A, Mulshi Thakarsi Building, Islampura Street, Near Alankar Cinema, Mumbai β 400004, India.
It increases only cost..
Mild Steel ERW Pipe is very popular in India. Tube Trading Co offers Mild Steel ERW Pipes to different industries and for varied applications. All Mild Steel ERW Pipes of Tube Trading comply by the Mill Test Certificate. Robust design, wear resistance, superior finish and durable quality of the Mild Steel ERW Pipes of Tube Trading make it an ideal choice for the Oil & Gas, Petroleum, Petrochemical, Chemical, Machine Building, Automobile and much more industries.Β If you are looking for a bulk supplier of MS ERW pipes in India, you may contact Tube Trading. Tube Trading originates from Vadodara, India offers products pan India.
One pipe is electric resistance welded (erw) the other is extruded through a thimble. In other words one has a seam the other doesn't.
it covers both
ERW: Electric Resistance Welding tube - tubes are rolled and joined With welding - fin cut is there CRW: Cold Drawn tube - without fin cut - Draw process
Sch 40 electric resistance welded pipe is generally used for utility lines such as compressed air and water lines.
A CEW pipe stands for a cold drawn electrically wielded pipe. Pipes can be made in a number of ways. One such method is to make pipes from sheet steel. The sheet is cut to the required width and rolled along the length. The ends are to be joined so that is forms a pipe. When they are welded using resistance then they are called ERW pipes and when they are electrically welded they are cold drawn electrically welded pipes or CEW pipes.
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
Look back at the history of failures with ERW and it explains itself. The liklihood of a failure is higher and the consequences are enormous.
Steam carrying pipes