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Pre heat CM tube
Posted: Wed Feb 02, 2011 9:21 pm
by pro mod steve
I have read to pre heat CM tube in cold temperatures but can any one explain technically why?
Re: Pre heat CM tube
Posted: Thu Feb 03, 2011 10:01 am
by jpence38
The tube should be at the very least 70 deg. before welding. As you know heat control is a critical factor in welding CM. As for my 2 cents worth, hydrogen embrittlement is the issue . There must be suffucient heat for a sufficient amount of time to allow the hydrogen to diffuse fron the HAZ. If not, CRACK. And we all know that CRACK kills.