Posted by dej(Jed) on March 31, 2014 at 08:41:10 from (141.189.113.1):
In Reply to: welding a block posted by Brian806 on March 31, 2014 at 07:17:05:
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Cast is very porous. I have welded several large pieces into blocks before. Use Ni rod, but that alone won't get the job done. What will happen is that as you weld, it will crack behind on what you have already done. I used a torch to preheat the cast to a red hot color. Next I welded several inches, stopped and cooled what I had done with water on a sponge. I next reheated the area and repeated that procedure until I had welded the whole thing. The pre heating takes the cast to near a flowing state and you then flow the Ni rod into the mix. The cooling enables the metal to stay consistent across the surface.
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