ERW (Electric Resistant Welding) is one of the ways the seam in seamed pipe is joined.
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Original poster: ERW pipe is made by welding flat rolled steel "skelp" into a tubular section, using electrical resistance as ozzb has described.
Seamless pipe is made by piercing solid "round billets" on a pipe mill.
I have no idea at all what you mean when you say SEAM pipe. Seams would be rejectable imperfections on the product in my experience.
There are a number of applicable standards that could apply, depending on the country of your project.
milo
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piping
Re: piping
