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Tweco 412-3545 MIG welding gun air-cooled 12 ft cable straight handle fixed 60 degree neck

Tweco

Tweco 412-3545 MIG welding gun 400 A 60 % duty cycle 12 ft air-cooled

SKU CH-133A-7WHYA MPN 412-3545

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

  • Product 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.

How it compares

Measured against everything we stock in Welding Equipment & Positioners, at today’s prices. Recalculated every night.

Price $464.99
Pricier than about 90% of the 1,978 comparable items (median $50.99).

Specifications

Product
Brand nameTWECO
Product typeWelding 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.

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