The Tweco Spray Master MS420 (Part Number 1040-1059) is a heavy-duty, air-cooled MIG welding gun designed for industrial fabrication environments. Rated at 400 Amps at a 60% duty cycle using CO2 gas, this gun is engineered to handle high-deposition welding processes including Spray Transfer and Flux Cored Arc Welding (FCAW). The unit comes pre-configured with a 20-foot (6.1 meter) cable assembly and is set up for 1/16-inch (1.6mm) welding wire, making it ready for immediate deployment in structural steel and heavy manufacturing applications.
This model features a standard Tweco backend connection, ensuring compatibility with wire feeders and power sources equipped with Tweco-style receptacles. The Spray Master series is renowned for its simplified maintenance; the conductor tube, trigger, and consumables are easily accessible and replaceable. The gun utilizes standard Tweco consumables, including the 11 Series contact tips and 24 Series nozzles, which are widely available and cost-effective. The cable assembly is reinforced to withstand the rigors of the shop floor, resisting cuts, abrasion, and heat.
Technical specifications include an ergonomic handle design that minimizes operator fatigue and a 360-degree rotatable conductor tube (on select configurations) or fixed heavy-duty neck options. The MS420 excels in heat dissipation, allowing for prolonged welding intervals without overheating the handle. It is an optimal choice for MRO, shipbuilding, and construction equipment manufacturing where durability and high-amperage performance are critical.
| Additional Information |
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| Brand:Tweco |
| Amperage:400 |
| Length:20 ft |
| Wire Size:1/16" |
| Back End:Tweco |
| Cooling Method:Air Cooled |
| Duty Cycle:60% |
| Process Type:MIG (GMAW), Flux Cored (FCAW) |
| Cable Length:20 ft |
| Wire Diameter:1/16" |
| Connection Type:Tweco Style |
| Packaging Description:pack of 1 |
