>> > The second one provides the +5V (at 125A or something)
>> That's a MIG welder, Tony...
> I thought welders typically used tens of volts...
> But I haev no intention of short-circuiting my 11/44 PSU to see if I can
> weld a screwdriver to the terminals.
A Long, LONG time ago, I had a 11/750.
Believe me, it can weld. Been there, done that :o)