Tweco
Tweco M412-3545 MIG Gun 400 A 0.045 in 12 ft Miller
Air-cooled MIG gun rated 400 A at 60 % duty cycle, accepts 0.035 in wire and connects to Miller equipment
- TypeWelding Parts & Supplies
- 400 A capacity handles heavy fabrication jobs
- 60 % duty cycle sustains long welding runs
- Miller-compatible rear connection fits existing equipment
- 12 ft cable gives wide workspace reach
- Fixed 60° neck tube positions wire precisely
Air-cooled MIG gun for Miller
The Tweco M412-3545 is an air-cooled MIG gun rated at 400 A with a 60 % duty cycle. It ships with a 12 ft cable and a Miller-compatible rear connection. The straight handle and standard trigger suit everyday fabrication and repair work.
Suits CO2 and mixed-wire jobs.
Welders running CO2 shielding gas with solid, flux-cored or aluminium wire up to .035 in will find this gun a direct fit. Shops that require a water-cooled torch for continuous high-amperage production or a different rear connection should look at other models.
400 A / 60 % duty cycle decides fit
The 400 A rating at 60 % duty cycle is the single figure that determines whether this gun matches your welding procedure. If your process demands a higher continuous current or a longer duty cycle, this unit will not meet that requirement.
Highlights
- 400 A capacity handles heavy fabrication jobs
- 60 % duty cycle sustains long welding runs
- Miller-compatible rear connection fits existing equipment
- 12 ft cable gives wide workspace reach
- Fixed 60° neck tube positions wire precisely
Specifications
| Type | Welding Parts & Supplies |
|---|---|
| Brand | TWECO |
Questions about this item
How much heat builds up when the 400 A gun runs at its 60 percent duty cycle all day?
The air-cooled design relies on ambient airflow, so continuous operation at 60 percent duty cycle keeps the handle and cable warm but within the rated thermal limits for the 12 ft length.
What power source and wire feeder does the Miller-compatible rear connection require?
It plugs directly into a Miller-style feeder with a standard power pin, so you need a compatible Miller or Miller-interface power source and feeder already in place.
Will the fixed 60-degree neck and 0.035 in maximum wire diameter work with the older solid wire spools I already have?
Yes, the gun accepts solid, flux-cored and aluminium wire up to 0.035 in, and the fixed 60-degree neck fits existing joint access the same way as earlier Classic No. 4 models.
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