14AH-364 - Tweco Style 14AH-364 Contact Tip 3/64" for Aluminum - 25 Pack

Precision Engineered for Aluminum Welding Applications

The 14AH-364 Contact Tip is a premium-grade consumable designed specifically to address the unique challenges of Gas Metal Arc Welding (GMAW) with aluminum wire. Unlike standard steel tips, this heavy-duty component is manufactured from a specialized copper alloy tubing that provides superior thermal conductivity and wear resistance, essential for high-amperage applications up to 400 amps. The "AH" designation indicates its specific optimization for aluminum (A) and heavy-duty (H) service, making it a critical component for industrial fabrication environments.

One of the primary failure modes in aluminum welding is micro-arcing and burnback caused by poor electrical contact or feeding friction. This contact tip features a precision-machined internal diameter (ID) held to a strict tolerance of +/- .003 inches. This specific clearance accommodates the higher thermal expansion rate of aluminum compared to steel, preventing the wire from seizing inside the tip as it heats up. Furthermore, the internal bore is finished to an exceptionally smooth surface to minimize friction, ensuring that soft aluminum wires (such as 4043 or 5356 series) feed consistently without shaving or birdnesting at the drive rolls.

Designed for compatibility with Tweco-style MIG guns, the 14AH-364 fits standard 52 and 52FN gas diffusers. Its threaded base ensures a solid mechanical connection that maximizes current transfer efficiency from the diffuser to the wire. This tip is rated for use with 3/64" (1.2mm) wire diameters and is an ideal replacement for the OEM part number 1140-1213. By maintaining consistent arc stability and reducing downtime associated with tip failures, this consumable significantly enhances process control in automated and manual aluminum welding operations.