Welder as a power supply transformer

I have a 130A sears ac welder that I bought for $10 at a
yard sale. As a welder it is a piece of junk, it welds and
the amps are OK but compared to the Millers we have at work
it is not very good, so I was thinking to use the
transformer for my power supply for a Gekko G320 servo
setup. I haven't taken the cover off recently but I believe
the windings are aluminum and the transformer is multi
tapped therefore making the voltage adjustable. I was
wondering if anyone has any thoughts or experience with such
things?