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379-6705 - Tweco Style 400A MIG Gun 15ft .045 Wire Ready

Packaging: 1 of each
$494.46/ea $353.19/1 of each only $353.19/eaSave 29%

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OVERVIEW

High-Performance Tweco-Style 400 Amp MIG Gun

Upgrade or replace your existing welding torch with the KK R4015-45, a premium quality 400 Amp MIG gun modeled after the industry-standard Tweco Spray Master series. This gun is built to deliver superior performance in high-duty cycle applications, making it a staple for heavy fabrication, shipbuilding, and structural steel work. The air-cooled design is efficient and lightweight relative to its power rating, reducing operator fatigue during extended welding sessions.

The R4015-45 is outfitted with a 15-foot cable assembly, offering a balance between reach and wire feedability. It comes ready to weld with .045" (1.2mm) wire, complete with the appropriate liner and contact tip installed. The backend connection is a Standard Tweco plug (metal body with O-rings), which is the most common connection type in the North American market. This ensures seamless compatibility with Lincoln, Miller, and ESAB feeders that are equipped with Tweco adapters or direct connections.

Maintenance is straightforward thanks to the gun's compatibility with standard Tweco consumables. It utilizes the heavy-duty 14 Series contact tips and 24 Series nozzles, known for their longevity and heat resistance. The conductor tube (gooseneck) is rotatable on many compatible models, allowing for better access in tight joints. The cable itself features a durable outer jacket that resists cuts, burns, and abrasion, protecting the copper stranding and gas hose inside.

Technical Specifications:

  • Amperage Class: 400 A
  • Duty Cycle: 60% with CO2
  • Wire Diameter: .045" (1.2mm)
  • Cooling: Air / Gas Cooled
  • Connection: Tweco #4 Style

Whether you are replacing a damaged gun or outfitting a new feeder, the KK R4015-45 offers professional-grade performance at a competitive price point.

Additional Information
Brand:Tweco Style
Amperage:400
Length:15 ft
Wire Size:0.045"
Back End:Tweco
Item:Accessory
Cooling Method:Air Cooled
Duty Cycle:60%
Connection Type:Tweco #4 (Standard)
Cable Type:Coaxial
Handle Style:Curved / Ergonomic
Packaging Description:1 of each
Front End:Tregaskiss
Amps:400amp

INCLUDED

  • 1 x KK R4015-45 400A MIG Gun (15ft)
  • 1 x Contact Tip (.045")
  • 1 x Nozzle
  • 1 x Gas Diffuser
  • 1 x Liner (Pre-installed for .045")

APPLICATIONS

  • Structural Steel Fabrication
  • Heavy Equipment Manufacturing
  • Shipbuilding and Repair
  • General Industrial Fabrication
  • Trailer Manufacturing
  • Railcar Repair

FAQ

This gun is rated for 400 Amps, typically at a 60% duty cycle when using CO2 shielding gas.

It features a Standard Tweco connection (often called Tweco #4), which is a metal plug with two O-rings and a trigger lead connection.

It uses standard Tweco-style consumables, including 14-series contact tips, 24-series nozzles, and 54-series gas diffusers.

Yes, the liner is replaceable. It comes with a liner for .045" wire, but you can change it to accommodate other wire sizes.

Yes, but you will need to change the contact tip to a .035 size and ideally switch the liner to one sized for .030-.035 wire for optimal feeding.

It works with Miller welders if the feeder has a Tweco adapter. If your Miller has a direct Miller pin connection, this gun will not fit without an adapter kit.

The KK R4015-45 is an air-cooled MIG gun.

The cable is 15 feet long.