Hi guys, first time posting. I recently acquired an old airco 330 amp welder from my dad. He got it to try tig but never got around to it so he gave it to me. Long story short, I went to weld some angle and couldn't strike an arc. Remote set to standard, contactor set to standard, HF off, straight polarity, 125 amps 6011 rod. I let the machine run for about 10 minutes while I was checking all cables to make sure I wasn't missing something. Well lo and behold, a contactor? under the fan started to smoke. I Shut the machine down and flipped the breaker off to be safe. I called my dad and he said something about a knife switch but I don't see it anywhere. He said he flipped it for tig so I'm assuming it's still in that position.
Here's a picture of the part that started to smoke, can anyone identify it for me and explain how to check if I fried it?