Ddaddy said

I’m glad you are ok, but I am forced to wonder why the breakers didn’t trip before you found the issue?

An overheating and shorting circuit should have tripped them long before you decided to pull the plug.

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Cope said

It's strange. It didn't even trip the small breaker on the TIG let alone trip the 50 amp on the wall?

The TIG was still running when I turned it off.

My big question is why a machine that can draw 40 amps came with a 20 amp cord and plug?

It was a Lincoln square wave, about a year old.

Even after the cord blew out the 50 amp breaker was still hot.

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