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The Tweco 1040-1140 is a member of the renowned Classic No. 4 series, widely regarded as the standard of the industry for air-cooled MIG welding. Designed for heavy-duty fabrication and industrial manufacturing, this gun is rated at 400 Amps at a 60% duty cycle when using CO2 shielding gas. Its robust construction ensures longevity even in the most demanding environments, such as structural steel fabrication, heavy equipment manufacturing, and shipyards. This specific configuration features a 10-foot (3-meter) cable assembly, providing a balance of reach and wire feedability, and is terminated with a Lincoln-style rear connector, making it a direct replacement or upgrade for compatible Lincoln wire feeders and power sources.
Maintenance and consumable management are simplified with the Tweco No. 4. It utilizes the ubiquitous 14 Series contact tips, 24 Series gas nozzles, and 54 Series gas diffusers. These consumables are among the most widely available in the welding market, ensuring that downtime due to parts shortages is minimized. The gun features a metal-jacketed conductor tube (neck) which offers superior resistance to impact and heat compared to plastic-molded alternatives. The cable assembly is constructed with high-quality copper stranding and a durable outer jacket that resists cuts, burns, and abrasion, protecting the internal gas hose and control leads.
For facility managers and procurement specialists, the Tweco 1040-1140 represents a low-risk, high-value investment. Its modular design allows for the replacement of individual components—such as the trigger switch, handle case, or gooseneck—rather than requiring the purchase of an entirely new gun if damage occurs. This repairability significantly lowers the total cost of ownership over the lifespan of the equipment. The gun is capable of running wire diameters ranging from .035" up to 5/64" (with the appropriate liner change), making it versatile for various welding procedures.
Key Technical Specifications:
| Additional Information |
|---|
| Amperage:400A |
| Cable Length:10 ft |
| Connection Type:Lincoln |
| Cooling Method:Air Cooled |
| Wire Diameter Capacity:0.035" - 5/64" |
| Series:Classic No. 4 |
| Duty Cycle:60% @ 200A (Argon/Mix), 60% @ 400A (CO2) |
| Neck Angle:60 Degrees |
| Consumable Series:14 Series Tips, 24 Series Nozzles, 54 Series Diffusers |
| Handle Type:Standard Trigger |
