Inductive ballast (Welders)

Fellow coilers,
Lincoln electric makes a welder that appears to be well suited
for our purpose.  Model AC225C is a 225amp variable inductance
welder that uses a threaded thermo-plastic rod to move the 
shunts.  I have not had the opportunity to try mine out yet,
so first hand info on actual performance I cannot comment on.
The price of these is fairly reasonable.  I bought mine on sale
at home depot harware for 159.00 us.  Stripped from lincolns
original cabinet I was disappointed to find aluminum windings,
but the duty cycle is still 20% and when the core is mounted
in my control cabinet with fans blowing on it, I would think
that there will be no problems.  The big advantage appears to
be that we could use this core to vary current without shutting
down the power and a reasonable purchase price.