10401903 - Tweco Classic 4 MIG Gun, 400A, 15ft, Tweco Connection

The Industry Standard for Heavy-Duty MIG Welding

The Tweco Classic No. 4 MIG Gun (1040-1903) is a legend in the welding industry, known simply as the "Classic 4." For decades, professional fabricators and industrial shops have relied on this 400-amp air-cooled gun for its rugged durability and straightforward design. When your production line or fabrication project demands a tool that can withstand the heat and abuse of daily operation, the Classic 4 is the go-to choice available at Josef Gas.

This model features a 15-foot cable, providing ample reach for working around large assemblies without constantly moving the wire feeder. The gun comes equipped with a standard Tweco rear connection, making it compatible with a vast range of wire feeders and power sources commonly found in Canadian workshops. Its air-cooled design is efficient and reliable, rated for a 60% duty cycle at 400 amps when using CO2 shielding gas.

One of the biggest advantages of the Tweco Classic 4 is its consumable system. It utilizes the ubiquitous 14 Series contact tips and 24 Series gas nozzles, which are readily available and cost-effective. The handle is ergonomically designed to reduce operator fatigue during long welds, while the metal-jacketed conductor tube provides superior protection against impact and heat. Whether you are welding structural steel, heavy equipment, or general fabrication, this gun delivers consistent wire feeding and arc stability.

Key Benefits for Josef Gas Customers:

• Proven Durability: Built to last in tough shop environments.
• Easy Maintenance: Simple design allows for quick liner and tip changes.
• High Capacity: Handles up to 400 amps for heavy plate welding.
• Universal Parts: Uses standard consumables you likely already stock.