I did a few tests on an end of life Mightymig, before I broke it up. The test failed was OCVs on the two power settings: 75 V and 90 Vdc! So I assumed a failed transformer. When remove, I wired it 'direct' and the output was 30 Vac, about right. Thoughts folks? If I was making welders, I would try to weld them together better.... Now I have another handy spare / or a door stop. Shane to scrap it for a fivers worth of copper?