Tweco
Tweco 412-3545 MIG welding gun 400 A 60 % duty cycle 12 ft air-cooled
Air-cooled MIG gun rated at 400 A with a 60 % duty cycle and a 12 ft cable for CO₂, flux-cored and solid wire welding
- TypeWelding Parts & Supplies
- 400 A output handles heavy fabrication
- 60 % duty cycle sustains long production runs
- Air-cooled design keeps weight low for comfort
- 12 ft cable reaches across large workpieces
- Fixed 60° neck gives consistent joint access
400 A air-cooled MIG gun
The Tweco 412-3545 is a 400 A air-cooled MIG welding gun built for flux-cored and gas-shielded processes. It accepts wire up to 0.035 in and runs on CO2 shielding gas with a 60 percent duty cycle. A 12 ft cable and Tweco rear connection fit existing Tweco feeders. The straight handle and fixed 60-degree neck give a familiar grip for production welding.
Best for high-amperage CO2 work
Welders who need a 400 A gun for solid, flux-cored or aluminium wire on CO2 will match the rated output and duty cycle. The fixed neck and straight handle suit operators who prefer a set position. Shops that require water cooling, a different rear connection, a rotatable neck or a higher duty cycle should look at other models.
60 % duty cycle at 400 A
The single figure that decides fit is the 60 percent duty cycle at the full 400 A rating. If the job runs continuous beads above that cycle the gun will overheat; if the cycle stays within it the gun delivers rated current all shift.
Highlights
- 400 A output handles heavy fabrication
- 60 % duty cycle sustains long production runs
- Air-cooled design keeps weight low for comfort
- 12 ft cable reaches across large workpieces
- Fixed 60° neck gives consistent joint access
Specifications
| Brand | TWECO |
|---|---|
| Type | Welding Parts & Supplies |
Questions about this item
How do I confirm the gun is running at its rated 400 A and 60 % duty cycle after setup?
Set the machine to 400 A output, weld continuously for six minutes, then pause for four minutes; the handle and cable should stay cool enough to hold without overheating.
What comes in the box and what must I supply separately?
The gun ships complete with a fixed 60-degree neck, straight handle, standard trigger, 12 ft cable and Tweco rear connection; you add contact tips from the 14 series, shielding gas (CO₂) and your chosen wire up to .035 in diameter.
Which tip series and wire diameter should I choose for this 412-3545 model?
Use Tweco 14 series contact tips and select solid, flux-cored or aluminium wire no larger than .035 in to match the gun’s maximum wire capacity.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
