We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Tweco 300 A air-cooled MIG gun 15 ft straight handle fixed 60-degree neck .035-.045 wire

Tweco

Tweco 315-3545 300 A MIG welding gun 15 ft .035-.045 wire

SKU CH-RD9Q-PR17G MPN 315-3545

Air-cooled MIG gun rated at 300 A with 60 percent duty cycle, 15 ft cable and .035-.045 in wire capacity

  • Product typeWelding Parts & Supplies
  • 300 A maximum current handles heavy fabrication
  • 60 % duty cycle sustains long production runs
  • Air-cooled design simplifies setup and maintenance
  • 15 ft cable length gives wide work reach
  • Fixed 60° neck tube angles for comfortable access

300 A MIG gun for 0.035–0.045 in wire

The Tweco 315-3545 is a Classic No. 3 air-cooled MIG gun rated at 300 A with a 60 % duty cycle. It accepts solid or aluminium wire from .035 to .045 in diameter and ships with 15 ft of cable. The gun is built for professional MIG (GMAW) work where a Tweco-compatible rear connection is required.

Fixed 60° neck with Tweco-compatible rear

A fixed 60° neck tube and straight handle position the tip for consistent access in typical fabrication setups. The Tweco-compatible rear connection mates directly with feeders using the same pattern, so no adapter is needed. Standard trigger operation and Tip Series 14 consumables keep parts interchangeable with existing shop stock.

Air-cooled at 60 % duty cycle

Air cooling handles the heat generated at 300 A when the gun runs within its 60 % duty cycle. The 15 ft lead length adds resistance, so the power source must deliver sufficient voltage at the feeder. Operators should pause between long seams to let the barrel and cable dissipate heat without exceeding the rated cycle.

How it compares

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

Price $427.99
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

At what point does the 60 percent duty cycle limit continuous welding with the 300 A rating?

The gun is rated for 300 A at a 60 percent duty cycle, so after six minutes of welding in a ten-minute period it must cool for the remaining four minutes.

How much heat does the air-cooled Classic No. 3 design produce during all-day operation?

Air cooling relies on ambient airflow around the cable and handle; sustained 300 A output at 60 percent duty cycle will make the neck and cable warm to the touch, so plan regular pauses.

Which wire feeder rear connection is required for the Tweco-compatible 15 ft leads?

The gun terminates in a Tweco-compatible rear connector, so your feeder must accept that same interface for the 15 ft cable to mate correctly.

More in Welding Equipment & Positioners

Similar items