16401101 - Tweco 64A45 Conductor Tube | 45 Degree | No. 4 MIG Gun Replacement

Technical Overview of the Tweco 64A45 Conductor Tube

The Tweco 64A45 Conductor Tube (SKU: 1640-1101) is a critical replacement component designed for the Tweco Classic No. 4 air-cooled MIG gun series. Engineered to meet the rigorous demands of industrial welding, this conductor tube—commonly referred to as a gooseneck—facilitates the transfer of welding current, shielding gas, and wire from the gun cable to the contact tip. The '64' in the part number designates its compatibility with the No. 4 series (rated at 400 amps), while the '45' indicates a standard 45-degree bend angle, which is the most versatile configuration for general fabrication tasks.

Constructed from high-grade copper alloy, the 64A45 ensures minimal electrical resistance, thereby reducing heat buildup during prolonged welding operations. The tube is encased in a durable, heat-resistant insulating material that prevents electrical shorts if the neck accidentally contacts the workpiece or fixture. This insulation is vital for maintaining operator safety and protecting the equipment from damage. The precise machining of the threads at both the diffuser end and the gun handle end ensures a gas-tight seal, preventing shielding gas leaks that could lead to porosity in the weld.

This component is an OEM (Original Equipment Manufacturer) part, ensuring perfect dimensional compatibility with other Tweco consumables, such as the 54A gas diffuser and standard nozzle assemblies. Regular inspection of the conductor tube is recommended; signs of wear such as internal blockage, thread damage, or insulation breakdown necessitate immediate replacement to maintain weld quality and equipment longevity. The 1640-1101 is a direct fit for legacy Tweco No. 4 guns and compatible systems utilizing the Tweco backend and frontend geometry.