Posted by Engloid on 1/8/2006, 7:36 pm, in reply to "Re: Cu-Ni Pipe welding" I've welded a lot of this stuff, in accordance to ASME and Mil 248-D. I tig welded it. Try a feather edge, and add in very little filler on the root. For the most part, you want to fuse it, and many guys did. I felt more comfortable dabbing a touch of wire every 1/4" or so of travel. RN67 works great on it. As with most nickel alloys, there will be a lot of trash that floats on the puddle, but that's ok. Enough heat will push it to the sides of the puddle. I have never had hot cracking issues and have never preheated it. http://mywebpages.comcast.net/engloid/workpics/cunipipe.jpg http://mywebpages.comcast.net/engloid/workpics/flange2.jpg Below, this skid was all cuni pipe, but had been sandblasted for paint prep, so the color doesn't look the same:
68.47.171.32
I'll have to disagree with Leroy on this one...
http://mywebpages.comcast.net/engloid/workpics/lhd2.JPG
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