February 2010 - The DP 3545-20 Spool Gun is designed for soft alloy wire welding. The gun plugs into Hobart’s IronMan 230 MIG welder’s wire drive system—no tools required. This spool gun, rated at 200 amp at 60 percent duty cycle, uses 0.030 to 0.047 in. aluminum, steel and stainless steel wire.