Posted by george md on April 12, 2012 at 19:23:00 from (209.213.167.201):
In Reply to: Welding Cast Iron posted by 37Chief on April 11, 2012 at 22:00:48:
Stan,
The rods and flux that you mention are the best way to repair cast iron, on heavy sections or flat areas you will need much preheat minimum of 900 and best at 1200 deg F in fire brick oven, and needs post heat of 1500 and slow cool from 1500 to 1200 (half hour). A fast drop in temp from 1500 to 1200 will harden the cast and make it nonmachinable also makes it brittle and more likely to crack. The preheat,post heat , and slow cooling is why arc weld usually fails as the area around the weld is cool and sucks the heat away from the weld and surrounding area causing it to harden and become less ductile. great recipe for cracks . Below is a link to website , and the hot link is to the photo host. There you can see many things repaired with O/A cast iron welding.
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