Reply by SMP

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Posted on Hand tool repairs (welding cast)

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2895 posts in 824 days

#1 posted 10-01-2020 04:47 AM

I weld cast iron quite often. I have a mig and some things i’ve learned that help is to preheat the whole piece and then the area with a heat gun or propane torch, then go slow with the welder, just like an inch or so at a time and let it cool back down a bit. Less likely to get cracks. Also, try to find higher nickel wire/rod, works better and the higher nickel actually blends in more and easier to grind. Are you using the 55 nickel or 99?

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