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Update: Colleague at work is a dab hand at welding, and put a blob of stainless in the damaged area. now need to file it back to original shape. I'll use this thread as a log of the repair in case it helps anyone.
Tig welder settings from my colleague:
Think it was about 70 amps, modulated with pedal, pulse on, set to about 40hz. Pulse current 65%, pulse time probably 40-50%. It was stainless rod, probably 316.
Also the material did react weird at first, but the second attempt worked.
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