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The Tweco Classic No. 4 is an air-cooled MIG welding gun designed for heavy-duty industrial applications, specifically configured with a Miller-style rear connector for compatibility with ITW/Miller welding power sources. This gun features the signature oval-shaped handle with a molded-in yellow Tweco logo and is engineered for high heat resistance and continuous operation in MIG (GMAW), Flux Cored (FCAW), and Aluminum (GMAW) processes.
Features
Oval-shaped handle reduces grip force required and minimizes operator fatigue
High-impact crush-resistant handle utilizes special plastic composition for durability
Balanced handle design pivots at center for ease of use in multiple welding positions
Metal jacketed conductor tube improves electrical conductivity and heat dissipation
Self-cleaning silver-plated trigger contacts engage/disengage with every pull
Field repairable Cablehoz system requires no additional connectors for maintenance
Integrated gun hanger located at the bottom for convenient storage when not in use
Split handle case provides rapid access for internal repairs and component replacement
Front and rear steel spring strain relief minimizes wire feed issues at cable exit points
Interchangeable front end consumables compatible with Tweco Spray Master series
Specifications
Amperage: 400 Amps
Duty Cycle: 60% at 400 Amps (using CO2 gas); 100% at 275 Amps
Wire Size Capacity: .045" (1.2 mm) to 1/16" (1.6 mm)
Cable Length: 15 ft (4.6 m)
Cooling Method: Air-Cooled
Rear Connector Style: Miller Style
Conductor Tube: 360-degree swivel; Metal jacketed three-layer construction (copper tube/silicon-resin glass insulator/metal jacket)