Posted by dej(Jed) on April 12, 2012 at 10:39:07 from (141.189.113.1):
In Reply to: Welding Cast Iron posted by 37Chief on April 11, 2012 at 22:00:48:
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I have had a lot of luck welding engine block pieces in with Ni rod. It took
a bit of instruction, but what I was taught is as follows. I would heat a section of the block and piece cheery red with a torch. Don't try to heat the whole thing, but about a 6 to 8 inch section. Next weld the section with the Ni rod and then immediately cool it with a sponge and cold water.
Next move on and repeat the process until the whole patch is in place and welded. Cast is porus and the heating seems to facilitate the weld holding. If I just welded , the weld would split as it cooled .
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