Posted by colekicker on March 31, 2014 at 08:51:44 from (63.71.120.26):
In Reply to: Re: welding a block posted by dej(Jed) on March 31, 2014 at 08:41:10:
I would definitely not recommend this method. I hardly every disagree with someone on here, but I do disagree with his advice. Heating both pieces up is correct. The cooling part is what is wrong. Cast iron needs to cool slowly. You have different materials you are trying to cool at the same time that contract at different amounts. One method many use when welding cast iron is to heat both pieces. After welding, burying the pieces in sand and keeping heat on them (usually propane) for a while and letting it cool with the insulation. This extends the cooling time and helps it form together.
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