Posted by John G. Hasler on November 06, 2013 at 08:26:05 from (174.124.81.100):
In Reply to: Heat on Cast Iron posted by Bob Landers on November 06, 2013 at 07:38:47:
When using heat to loosen rusted bolts in a casting one usually heats the bolt, not the casting. Get the bolt head red hot quickly and then let it cool completely. This drives the water out of the rust reducing its volume. The expansion and shrinkage also causes a bit of motion of the bolt in the hole, helping to break it loose.
It isn"t practical to loosen bolts by heating the metal around them so that the hole swells more than the bolt does because the thermal contact between bolt and casting is so great and the thermal mass of the bolt so small that the bolt will never be significantly colder than the casting.
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