How is DOM tube better than ERW tube?
DOM (Drawn Over Mandrel) round tube is superior to ERW (Electronic Resistance Welding) round tube due to the following additional manufacturing processes of creating a seamless tube. First, a strip of steel is cold formed and passed through an electric resistance welder which joins the edges together, under pressure, to complete the tubular shape. At this point, the tube is labeled ERW. For DOM, the tube is drawn through one or more dies and over mandrels. Metallurgically, drawing improves the tube’s concentricity, tensile strength, and hardness. This process creates approximately 30% greater strength and stiffness in DOM-tube over its ERW-tube counterpart.
