Miller Maxstar 400 DC TIG Welder – 3-400A Amp Range, P/N 907716

Description

During continuous 8-hour heavy industrial fabrication shifts, the bare Miller Maxstar 400 DC TIG welder (P/N 907716) delivers non-stop 400-amp welding output at 100 percent duty cycle on three-phase lines. Heavy equipment manufacturing plants face thermal trip cutouts when running 5/16-inch carbon gouging rods on smaller 200-amp and 300-amp powerheads. This 400-amp industrial DC inverter operates on three-phase power from 208V to 575V, delivering laboratory arc stability from 3 amps up to 400 amps on heavy structural plate.

Auto-Line technology accepts primary electrical service across diverse commercial drops, maintaining constant arc voltage during plant power fluctuations. High-speed pulse TIG controls modulate current up to 500 Hz, constricting the plasma arc to pinpoint penetration while cooling the puddle to prevent stainless pipe wall sagging. Wind Tunnel technology routes cooling air across aluminum heatsinks while completely sealing internal circuit boards from conductive grinding grit.

Technical Specifications of Miller Maxstar 400 (P/N 907716)

• 3-400A Heavy Industrial Output Range: Fuses delicate 3-amp aerospace tubing up to 1/2-inch structural carbon steel plate.
• Heavy Industrial 100% Duty Cycle at 400A: Delivers non-stop welding current on heavy stainless fabrications without cooling stops.
• Auto-Line Universal 208V to 575V Input: Connects to single-phase or three-phase shop power lines without internal reconnection jumpers.
• High-Speed Pulse TIG up to 500 Hz: Controls heat input to narrow the heat-affected zone and prevent burn-through on thin alloy sheets.
• Dedicated Carbon Arc Gouging Terminal: Burns carbon gouging electrodes up to 5/16-inch diameter for rapid metal removal.
• Wind Tunnel Component Isolation: Protects internal circuit boards from airborne metal shavings by directing air through a central duct.

Heavy-Duty Architecture & Low Maintenance

Built for structural manufacturing plants, this bare 400-amp powerhead delivers extreme duty-cycle stamina with low power draw.

• Massive 400A output at 100 percent duty cycle burns continuously, slashing fabrication hours on heavy pressure vessels.
• Inverter power conversion draws lower primary current than conventional transformer powerheads, lowering monthly factory utility bills.
• Wind Tunnel isolation prevents conductive iron dust from shorting internal power switches during heavy fabrication shifts.

Equipment Integration & Fitment Specs

Measuring 24.75 inches long by 13.75 inches wide and weighing 134 pounds dry, this heavy industrial inverter mounts on factory assembly racks or mobile cylinder carts.

Commercial Coverage & Maintenance Upkeep

• Miller Electric covers the Maxstar 400 power source with a 3-Year True Blue warranty against electrical component defects.

Clean internal cooling passages every 100 hours with dry shop air, verify secondary cable connection tightness, and check primary electrical connections annually. Order the Miller Maxstar 400 DC TIG welder from Mulmotor.com for guaranteed factory-fresh units, complete manufacturer warranty coverage, and dedicated commercial equipment support.