ERW Pipe

ERW Pipe stands for Electric Resistance welded pipe. Electric Resistance Welding process is usually for large diameter which is also the cheapest available process. 
 
Generally when tube is made, it starts off as a flat sheet and this is rolled up into a tube and welded. This extra process strengthens the steel since it is cold formed by up to 20%.  The ERW pipes are typically used in applications over 3500 lbs. 

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