What is the difference between seamless and welded pipes?

Seamless (SMLS) pipe is formed by drawing a solid billet over a piercing rod to create the hollow shell. Seamless pipe withstands pressure better than other types, and is often more easily available than welded pipe.

Welded pipe is formed by rolling plate and welding the seam. The weld flash can be removed from the outside or inside surfaces using a scarfing blade. The weld zone can also be heat treated to make the seam less visible.

Why call seamless pipe?Most pipes are made by taking a strip of metal, rolling it up and then fusing the seam together. They're almost always weaker along the seam than anywhere else. There are ways of making pipes where the wall is a single piece that hasn't been welded shut. They're stronger , more expensive and they're called seamless.

What is the Difference of erw and seamless pipes?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

What is ERW pipe?Share In Plumbing, Industrial Engineering, Mechanical Engineering

What is ERW pipe?

Answer by Osama Albar Confidence votes 259ERW 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.