Tweco 1040-1904 Mig Welding Gun 400 Amp 15 Ft

Product Description

The TWECO 1040-1904 is a VELOCITY2 Classic No. 4 air-cooled MIG welding gun rated at 400 amps and 60% duty cycle, designed for heavy-duty industrial and fabrication environments. It accepts wire diameters from 0.035 inches to 0.045 inches and comes with a 15-foot cable assembly. The gun features a solid copper conductor path with a centered liner that fits inside the contact tip, reducing connection points and improving both thermal and electrical efficiency. VELOCITY2 gas-ported contact tips run cooler, resist threading damage, and can be rotated to extend service life. This gun is built for welders who need consistent arc performance and lower consumable costs over long service intervals.

The 1040-1904 is suited for heavy-duty fabrication applications including shipbuilding, offshore yards, steel industry work, automotive production, and industrial maintenance and repair. It is available with Tweco, Miller, Lincoln, and Euro-Kwik style rear connectors, making it adaptable to a wide range of wire feeders and power sources used across professional welding operations. Air-cooled construction keeps the setup simple and portable for shop and field use alike.

Key Features

• 400 amp rating at 60% duty cycle for sustained heavy-duty operation
• Accepts 0.035-inch to 0.045-inch wire diameters
• VELOCITY2 gas-ported contact tips run cooler and last significantly longer than standard tips — up to 2-3 times longer on short arc solid wire, 4-5 times on spray transfer, and 8-10 times on gas-shielded flux core
• Solid copper conductor path with fewer connection points for optimized electrical contact and heat dissipation
• Tool-free, threadless VELOCITY2 tip design allows rotation to prolong tip life and simplify changeover
• Centered liner seated inside the contact tip for smooth, consistent wire feedability and arc stability
• Compatible with Tweco, Miller, Lincoln, and Euro-Kwik style rear connectors

Compatibility

Compatible with Tweco, Miller, Lincoln, and Euro-Kwik style rear connectors. Designed for use with 0.035-inch to 0.045-inch solid wire, spray transfer wire, and gas-shielded flux core wire processes on heavy-duty MIG welding systems.

Installation Notes

Installation and setup should be performed by a qualified welding technician or trained operator. Always power down the welder and disconnect the gun from the feeder before changing consumables or connecting the rear fitting. Verify that the selected rear connector style matches the wire feeder output before assembly. Follow applicable AWS and manufacturer guidelines for cable routing and connection torque to maintain safe, reliable operation.

Technical Specifications

• Amperage: 400 amps
• Duty Cycle: 60%
• Wire Diameter Range: 0.035 inches to 0.045 inches
• Cable Length: 15 feet
• Cooling Type: Air-cooled
• Weight: 12.15 pounds
• Length: 23.3 inches
• Width: 3.4 inches
• Height: 14.3 inches

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1040-1904