Millermatic 252 MIG Welder has multiple settings The Millermatic 252 (250 amps at 40 percent duty cycle) features a large digital display and a built-in digital timer menu for setting standard wire feed run-in, shielding gas pre/post flow, wire burn-back and spot/delay (used to set repeatable tack welding parameters and ensure consistency). A push-pull gun direct connect feature allows a push-pull gun to plug directly into the machine without the need for extra modules, and a patented Auto Gun Detect feature allows the operator to simply pull the trigger on a connected MIG gun, spool gun or push pull gun while the machine recalls the voltage, wirefeed speed and timers of the active gun.