Different kinds of cast iron, more or less carbon in it, makes for a different response to welding. I've had good luck with peening as well. Some "magic" filler metal rod with tig, supposed to make life easier with no preheat or post heat or peening necessary on cast.
I have a Panasonic Tig set up, bought it and took a course for stainless.
A good friend of mine is a metal fabricator welder. I have utmost respect for his skills with a diversity of welding methods. His welds are so clean and even and things that are notoriously difficult to weld he does a...
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