Tweco
Tweco 315-3545 300 A MIG welding gun 15 ft .035-.045 wire
Air-cooled MIG gun rated at 300 A with 60 percent duty cycle, 15 ft cable and .035-.045 in wire capacity
- 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.
Highlights
- 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
Specifications
| Type | Welding Parts & Supplies |
|---|---|
| Brand | Tweco |
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.
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