welding hardened steel

What problems, if any, arise when welding hardened steel by TIG?
Josh

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JD Fowler wrote:

I'll add that I've had good luck using 312 or 309 stainless filler.
Ted
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Shrinkage cracking.Would advise some preheat to slow the cooling rate through the critical range 100deg.c-room temp.
--
Gwyn Phillips

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