Even if it is pot metal, you looking at a melting point around 400 Celcius since at least 65% of the metal compound is Zinc.
Standard solder for electronics melts at 200-250 Celcius, but that paste is great stuff if you can get your hands on it.
I've been welding for years and have never seen a succesfully repaired pot metal using TIG or any other methods. Not saying Chaos is wrong, but I've never seen it done.
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