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300A MIG Welding Gun, 15ft, Tweco Connection with 4-Pin Plug

$358.14/ea $252.19/1 per each only $252.19/eaSave 30%

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OVERVIEW

Upgrade Your Welding Setup with the ATT 300A MIG Torch

When your welding projects demand more power and reliability, the ATT315-35 300 Amp MIG gun is the tool you need. Built to handle the heat of high-amperage welding, this torch is a workhorse for any fabrication shop. The 15-foot lead gives you the freedom to access hard-to-reach joints without being tethered too closely to your machine. It’s the perfect upgrade or replacement for worn-out OEM guns, offering professional-grade performance at a competitive price point.

Built for the Real World

We know that welding environments are tough. That's why this gun features a rugged outer jacket that resists cuts, burns, and abrasion. The knuckle-joint strain relief at the handle allows for flexible movement without stressing the cable, preventing the common failure points found in lesser torches. The Tweco-style backend provides a solid, high-conductivity connection to your feeder, ensuring that the welding current gets to the arc where it belongs. The inclusion of a 4-pin trigger plug means it's ready to plug and play with specific machines that utilize this control configuration, saving you the headache of rewiring plugs.

Consumables Available Everywhere

Nothing is worse than running out of tips in the middle of a job and waiting days for proprietary parts. This gun solves that problem by using standard Tweco-style consumables. You likely already have these parts in your toolbox. It accepts:

  • 14 Series Contact Tips: The industry standard for durability and conductivity.
  • 24 Series Nozzles: Available in various bore sizes and styles (flush, recessed, stick-out) to suit your specific joint configuration.
  • 52/54 Series Gas Diffusers: For smooth gas flow and reliable tip seating.

Smooth Feeding, Stable Arc

The internal liner is designed to minimize friction, ensuring smooth wire feeding even when the cable is looped or bent. This results in less bird-nesting and a more stable arc, which translates to better weld bead appearance and less cleanup. Whether you are running solid wire with mix gas or flux-cored wire, this 300A gun provides the consistent performance professional welders demand. It's an investment in your productivity that pays for itself with every smooth bead you lay down.

Additional Information
Amperage:300
Length:15 ft
Back End:Tweco
Front End:Tweco
Brand:Tweco Style
Torch Type:MIG
Cooling Method:Air Cooled
Cable Length:15 ft
Trigger Connection:4 Pin
Duty Cycle:60% @ 300A
Packaging Description:1 per each

INCLUDED

  • 1 x 300 Amp MIG Gun (15 ft Cable)
  • 1 x Installed Liner (Standard .035-.045)
  • 1 x Contact Tip
  • 1 x Nozzle

APPLICATIONS

  • General Fabrication
  • Structural Steel Welding
  • Heavy Equipment Repair
  • Automotive Manufacturing
  • Shipbuilding
  • Farm and Ranch Welding
  • Maintenance and Repair Operations (MRO)

FAQ

This gun uses standard Tweco-style consumables. Specifically, it typically uses 14 Series contact tips, 24 Series nozzles, and 52 or 54 Series gas diffusers.

The gun is generally rated for 300 Amps at a 60% duty cycle when using CO2 shielding gas. If using mixed gas (Argon/CO2), the duty cycle rating may be slightly lower due to the higher heat generation of Argon.

This gun features a Tweco-style backend connection (often called a Tweco #4 connection) and a 4-pin trigger plug. You must verify that your wire feeder accepts a Tweco adapter and that the trigger receptacle matches the 4-pin configuration provided.

Yes, but you will need to change the liner to a Teflon or polymer liner to prevent wire shaving and feeding issues. You may also need specific aluminum contact tips.

Out of the box, 300A guns are typically set up for .035" (0.9mm) or .045" (1.2mm) wire. However, with the correct liner and contact tips, it can handle wire sizes ranging from .023" up to 1/16".

Yes, the liner is fully replaceable. It is recommended to replace the liner periodically or when you experience feeding issues to maintain optimal performance.

This designation usually indicates that the gun has a Tweco-style backend connection (where it plugs into the machine) and uses Tweco-style front-end consumables (nozzle, tip, diffuser).

Check your welder's manual or the face of the machine. The 4-pin Amphenol-style plug is common on certain Miller and older Lincoln or generic feeders, but pin configurations can vary. Ensure the pinout matches your machine's trigger circuit.
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