![]() Some ERW tube ends up being Drawn Over a Mandrel (DOM, or sometimes, Cold Drawn Welded), which removes the internal weld ridge, and mechanically strengthens and perfects the whole tube to its finished dimension. The welded variety tube (ERW – Electric Resistance Welded) begins as a strip of steel which is shaped between rollers and has a visible weld seam along its length. It is also made from mild steel, and sometimes rolled and welded too. ![]() Structural or mechanical tube on the other hand, is (at least, externally) dimensionally accurate and has a bright finish. It is not dimensionally accurate material either and is often visibly out-of-round with a scaly black appearance. It is identifiable by a visible internal weld ridge. ![]() Its size refers to its Nominal Bore, as it is this dimension that is used to calculate the flow.ĬHS is rolled and then welded from thick, mild (low-carbon) steel and withstands being pressurised, but CHS is not intended for structural use. The purpose of pipe (CHS – Circular Hollow Section), is to carry either gas or fluids. Well, for a start, round tube is stronger both in torsion and deflection than square tube of the same weight. Admittedly, butt-welding square tube is simplicity itself, but mitring round tube – given a little thought and patience- is also very simple….once you know how! And once it’s done, how good does it look! What’s the difference between tube and pipe? Why would you choose to work with round tube? Want to know a little more about tubes and how to work with them? This is the place to start.
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