While many pipe manufacturing methods exist, the most prominent discussion in the industry compares electric resistance welded (ERW) vs. seamless (SMLS) steel pipe. Both ERW and seamless steel pipe manufacturing methods have been in use for decades; over time, the methods used to produce each have advanced.

Mar 19, 2025 · ERW Steel Pipe adopts the welding process, cold bending and forming as the core, bending and welding the steel plate or steel strip into a pipe through precision molds. ERW out adopts the resistance welding technology to achieve seamless welding.

Dec 20, 2018 · Key insights on the different types of pipes in the O&G industry: use of Seamless vs. Welded (ERW/HFW, EFW, LSAW/DSAW/SSAW) and differences.

SMLS, ERW, LSAW, and SSAW are some of the common production methods used in the production of steel pipes. Understanding the differences between these steel pipes can help ensure that the material best suited to the project's needs is selected to optimize performance, cost, and durability.

Feb 21, 2001 · ERW pipe typically has a manufacturing tolerance of 0.01" while seamless has a tolerance of 12.5%. This will affect the wall thickness calculations. It is also easier for the manufacturer to make the wall thickness on ERW pipe closer to the -0.01" tolerance than the -12.5% on seamless.

In this article, we will explore the basic concepts and differences between four primary types of pipes: SMLS, long seam electric resistance welded (ERW), submerged arc welded (LSAW), and spiral submerged arc welded (SSAW).

The main differences between seamless pipes (SMLS) and ERW pipes are as follows: 1. Appearance. The outer surface defects of the blanks used in seamless steel pipes cannot be eliminated by the hot rolling process.

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

Aug 1, 2024 · ERW Steel Pipe: Superior wall thickness uniformity and ovality enhance anti-collapse performance compared to seamless pipes. - Impact Test. ERW Steel Pipe: Higher base material impact toughness, with weld impact energy ensured to meet high standards through meticulous control of welding parameters. - Burst Test

Jan 10, 2025 · SMLS Elbow: Seamless elbows have a uniform, smooth appearance without visible weld lines. This makes them aesthetically pleasing and reduces the risk of weak points caused by weld seams. ERW Elbow: ERW elbows, on the other hand, typically have a visible weld seam along their surface.