Tweco 1040-1112 Mig Gun 400A 12 Ft Air Cooled

Product Description

The TWECO 1040-1112 is the Professional No. 4 Classic Series MIG gun rated at 400 amps, designed for semi-automatic MIG welding in medium to heavy-duty fabrication environments. It accommodates wire sizes up to 1/16 inches and ships with a 12-foot lead cable that uses a Tweco-style rear connection for reliable wire feedability. The air-cooled design delivers a 60% duty cycle when run with CO2 gas. A 60-degree metal jacket conductor tube swivels a full 360 degrees around the handle, and the three-layer conductor tube construction — copper tube, silicon-resin glass insulator, and metal jacket — provides a consistent current path to the contact tip. Licensed welding technicians and industrial fabricators install this gun in production and maintenance settings.

This gun is suited for a wide range of applications including shop fabrication, production welding, maintenance and repair, and light industrial work such as farm and garage environments. The oval-shaped handle is balanced to pivot at its center, reducing operator fatigue across extended welding sessions. The Mig-Kwik connection allows quick hookup and disconnection at the wire feeder. Front-end consumables are interchangeable with the Tweco Spray Master series and other Tweco Professional No. Series guns, which reduces inventory requirements for shops running multiple guns.

Key Features

• 400A rating with 60% duty cycle at CO2 gas for medium to heavy-duty fabrication
• Accommodates wire up to 1/16 inches with 12-foot Tweco-style rear-connection lead cable
• 60-degree metal jacket conductor tube swivels 360 degrees for positioning flexibility
• Silver-plated trigger contacts with self-cleaning action on every actuation
• Steel spring strain relief supports the Cablehoz at the rear of the handle to minimize wire feed issues
• Split-half handle case allows field repair without additional connectors
• Gun hanger at the bottom for safe, easy resting when not in use
• High-impact crush-resistant handle made from special plastic composition for industrial durability

Compatibility

Front-end consumables are interchangeable with the Tweco Spray Master series and Tweco Professional No. Series guns. An adapter plug is required for wire feeder connection. Designed for semi-automatic MIG welding systems using CO2 or compatible shielding gas.

Installation Notes

Installation and setup should be performed by a qualified welding technician familiar with MIG welding equipment and applicable safety standards. Disconnect and de-energize the wire feeder before connecting or disconnecting the gun at the feeder connection. Verify that the conductor tube and Cablehoz are secured with both ball-point screws before initiating a weld. Do not exceed the rated 400A output or the specified duty cycle to avoid heat damage to the gun or cable assembly.

Technical Specifications

• Amperage Rating: 400A
• Duty Cycle: 60% at CO2 gas
• Lead Cable Length: 12 feet
• Maximum Wire Size: 1/16 inches
• Cooling Method: Air Cooled
• Conductor Tube Angle: 60 degrees
• Connection Type: Tweco-style rear connection with Mig-Kwik feeder connection
• Package Weight: 10.35 pounds
• Package Length: 23.1 inches
• Package Width: 14.3 inches
• Package Height: 3.4 inches

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1040-1112