[G.M.]

You have to be careful shorting out the contact tip of
a MIG welder. When shorted the amps go way up. How
high depends on the out put range the machine is set
at. This can burn out the transformer and possibly the
diodes. You can use as a power supply for chrome
platting, starting a car and other applications where a
DC power supply is required. G.M.

I made MIG welders in the 60's. I made the first ones
for body shops, it was called "Fender Mender" They were
sold by welding supply companies and didn't really catch
on until body and paint supplies started selling them. I
sold the company in 1980. They still make welders for
Snap-On. G.M.