10401105 - Tweco Classic 4 MIG Gun, 400A, 25ft, Tweco Connection, .035-.045 Wire

Industry Standard 400A MIG Gun for Heavy Fabrication

The Tweco Classic No. 4 MIG Gun (1040-1105) represents the benchmark for air-cooled welding performance in industrial environments. Designed for durability and ease of maintenance, this 400-amp welding gun is engineered to handle the rigors of high-volume fabrication, shipbuilding, and heavy equipment manufacturing. With a generous 25-foot cable, it offers exceptional reach, allowing operators to move freely around large workpieces without constantly repositioning the wire feeder.

This specific configuration comes ready to weld with a setup optimized for .035" to .045" wire diameters, covering the most common range for structural steel applications. The gun features a standard Tweco backend connection, making it compatible with a vast array of wire feeders and power sources that utilize the Tweco-style adapter. The air-cooled design relies on heavy copper construction to dissipate heat effectively, ensuring a 60% duty cycle at 400 amps using CO2 shielding gas.

Maintenance managers appreciate the Classic No. 4 for its serviceability. The consumables—including the famous 14 Series contact tips and 24 Series nozzles—are widely available and easy to swap out. The mechanical cable connections are field-repairable, meaning a damaged cable doesn't necessarily mean buying a whole new gun. The rugged handle and heavy-duty spring strain reliefs at both the feeder and gun ends protect the internal cabling from kinking and abrasion, ensuring a long service life even in the toughest shops.

Key Features for Industrial Use:

• High Amperage Output: Rated for 400A, suitable for spray transfer and flux-cored applications.
• Extended Reach: 25-foot cable length maximizes workspace flexibility.
• Proven Consumables: Utilizes standard Tweco consumables known for longevity and arc stability.
• Robust Construction: Metal-jacketed conductor tube and impact-resistant handle.