Quote:
Originally Posted by Model_A
I'm just learning Model As but know a thing or two about welding and metalwork.
Welding cast iron is a PITA and half the people who claim they can, can't. Its preheat, post cool, the right filler/electrodes, and its always risky. An old saying in the welding trade is "The correct way to weld cast iron is to get someone else to do it..."
If you can braze it, that's considerably easier.
Use a scribe to alternate-mark your faint end-cracks and groove them with a cutting wheel (they tend to vanish when you grind groove them and are hard to keep track of). A 3" wheel on a die grinder is super handy for this.
JB Weld in applications like this is basically like 'hard caulk'. There's little surface adhesion and its not going to really get into the light cracks, which is where the risk is that they get worse.
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I have always heard that you reverse the leads on the welder....