Tweco 1040-1128 Mig Welding Gun 400A 25 Ft Air Cooled

Product Description

The TWECO 1040-1128 is a Professional No. 4 Classic Series MIG gun rated at 400 amps with a 25-foot lead cable and Miller-style rear connection. Air-cooled and built for semi-automatic welding, it accommodates wire sizes from 0.045 inches to 1/16 inches and operates at a 60% duty cycle with CO2 gas. The oval-shaped handle is molded from high-impact crush-resistant plastic and is balanced to pivot at the center, reducing operator fatigue during extended use. A 60-degree metal jacket conductor tube with full 360-degree swivel and three-layer construction — copper tube, silicon-resin glass insulator, and metal jacket — delivers a reliable current path from handle to contact tip. Licensed welding professionals and fabricators typically install and service this gun.

The 1040-1128 is suited for medium- and heavy-duty fabrication environments including production shops, maintenance and repair operations, and industrial manufacturing. The fully insulated Mig-Kwik connection enables fast attachment and detachment at the wire feeder, minimizing downtime during consumable changes or equipment swaps. Front-end consumables are interchangeable with the Tweco Spray Master series, which helps reduce inventory. The steel spring strain relief supports the Cablehoz at the rear of the handle to reduce wire feed issues across varying positions and orientations.

Key Features

• 400-amp rating with 60% duty cycle using CO2 gas
• Accepts wire sizes 0.045 inches to 1/16 inches
• 25-foot lead cable with Miller-style rear connection and fully insulated Mig-Kwik connector
• 60-degree metal jacket conductor tube swivels 360 degrees around handle; three-layer construction for durability
• Silver-plated trigger contacts with self-cleaning action on each engagement and disengagement
• Two ball-point screws secure the Cablehoz and conductor tube; split-half handle case allows field repair without additional connectors
• Gun hanger at bottom of handle for easy resting when not in use

Compatibility

Front-end consumables are interchangeable with the Tweco Spray Master series and Tweco Professional No. series. Rear connection is Miller style. Designed for semi-automatic MIG welding setups in medium- to heavy-duty fabrication applications.

Installation Notes

Installation and service should be performed by a qualified welding technician or electrician familiar with MIG equipment. Disconnect and power down the wire feeder and welding power source before attaching or removing the gun. Verify that the rear connection style matches the wire feeder before making the Mig-Kwik connection. Inspect the conductor tube, Cablehoz, and contact tip for wear or damage at each service interval.

Technical Specifications

• Amperage: 400 amps
• Duty Cycle: 60% with CO2 gas
• Wire Size Range: 0.045 inches to 1/16 inches
• Lead Length: 25 feet
• Cooling Method: Air cooled
• Conductor Tube Angle: 60 degrees
• Rear Connection Style: Miller
• Package Weight: 17.38 pounds
• Package Length: 23.3 inches
• Package Width: 14.3 inches
• Package Height: 3.3 inches

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1040-1128