Welder Maintenance

In my "Day job" I am a maintenance electrician. Basically I am sad enough to fix things at work and at home
While stripping and repairing the mass-o-migs I have, I found this.

The pitting was caused by the nuts being loose on the stud. The nuts were holding the lug supplying current to the mig gun.
A bad joint here has caused arcing and damage to the threads.

Best result of this is a loss of weld quality. Worst case- fire

I have been sanding all contacts smooth and tightening them to effing tight.
These connections are usually in a location that the user can get to and check.
A little care and they will last a lot longer. I can't help but wonder if this was part of the reason these welders were offloaded in the first place.
by the end of today one more will be functioning. Resurrected
thanks

1 down 6 to go

now have the Safmig sorted. it was a blown bridge rectifier on the wire feed circuit
attached is a video that helped me work the feller out

and a shot of the ugly but functional welder

thanks

mig deliverys!

just had 5 more migs dropped off tp the shop making 7 n total in the workshop. none working
my old Safmig 180 has a minor issue that needs sorting before i sell it.
the hobart seems to need a new pot then it's cooking.
ive got 4 porta mig 300's that are a little sorry. will be a real hunt to fix them up
and a mig-o-mag 300A in unknown condition.
things have been slow as far as Blog fodder but these migs need fixin and sellin so i'd better yank my finger right out

rollin off Toms truck!