15001100 - Tweco 35-50 Gas Diffuser for No. 3 & 4 MIG Guns (5-Pack)

Precision Engineering for Professional MIG Welding

The Tweco 35-50 Gas Diffuser (Stock No. 1500-1100) represents the standard of excellence in MIG welding consumables. Designed specifically for the widely used Tweco Professional No. 3 and No. 4 series MIG guns, as well as the Spray Master series, this component plays a critical role in the welding circuit. It serves as the mechanical and electrical interface between the conductor tube and the contact tip, requiring high-grade materials and precise machining to function correctly under thermal stress.

Manufactured from a specialized brass alloy, the 35-50 diffuser offers exceptional thermal and electrical conductivity. This ensures that welding current is transferred efficiently from the gun's cable assembly to the 14 Series contact tip with minimal resistance heating. The component is engineered with precision-drilled gas ports that distribute shielding gas evenly around the weld pool. This laminar flow control is essential for preventing atmospheric contamination and porosity, particularly in high-amperage applications where turbulence can disrupt the shield.

The 35-50 is designed to work in conjunction with the 34A insulator. The external surface of the diffuser provides the seating area for the insulator, which in turn secures the slip-on nozzle (typically 23 or 24 Series). This system allows for rapid nozzle changes and cleaning without the need for tools. The internal threads are machined to tight tolerances to prevent cross-threading on the conductor tube, a common failure point in inferior aftermarket copies. For industrial environments requiring reliable performance at 300 to 450 amps, the genuine Tweco 35-50 remains the industry benchmark.

Technical Specifications

• Material: High-Conductivity Brass
• Amperage Rating: Up to 450 Amps (depending on gun model)
• Tip Compatibility: Tweco 14 Series (e.g., 14-35, 14-45)
• Nozzle System: Slip-On (requires 34A Insulator)
• Connection: Threaded to Conductor Tube