Quote:
Originally Posted by preston
Not sure I would trust fusion welded exhaust pipes though, need the extra strength there. On body patches not so much.
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You got that backwards, ridiculously expensive paint jobs go on the body work.
You have built the exhaust so you know, Have you tacked one joint together and then had to take it apart? 4 good tacks and you have a hell of a time getting it apart.
A 3" tube has over 9" of weld holding it together at each seam. Again, fit up is key. A perfectly fitup joint will fusion weld with no problem. The sanitary guys have automatic welders as well. There are two styles, one that spins the pipe and one that spins the tungsten around the pipe, neither one uses filler of any kind.
Another thing that will make it gray and chalky is dirty tungsten or getting a contaminant in the weld.