Resistance Tube
What is an Electric resistance weld (ERW) tube?
Steel tubes
This is either a pipe or tube (i.e. muffler pipe for your automtoive is made this way) that has ben bend from flat metal into a tube shape and then welded together to form a solid pipe/tube.
A good explanation can be found at:
http://www.thefabricator.com/ResistanceWelding/ResistanceWelding_Article.cfm?ID=89
Other sites that will give more inforamtion:
http://files.aws.org/wj/supplement/01-2004-CHOI-s.pdf
http://www.usstubular.com/facilities/erw.htm
http://www.lbfoster.com/piling/pipepile.html
http://www.weldingengineer.com/1%20Resistance.htm
http://www.ipsco.com/Products/TubularProductManual/TubularProductManualERWIntro.pdf
http://www.phamitech.com/pd_tubemill.htm
Hope that you find these sites useful.
Good Luck.
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