PT4015LPB - Tweco Style #4 MIG Gun 400A 15ft for Lincoln LF72/74 Feeders

Technical Overview and Compatibility

The PT4015LPB is a robust 400 Ampere air-cooled MIG welding gun designed to provide a cost-effective and high-performance solution for industrial welding applications. This assembly is specifically configured to interface with Lincoln Electric wire feeders, such as the LF72 and LF74 series, that are equipped with Tweco-style adapter blocks. The gun features a standard Tweco #4 power pin (approximately 0.625-inch diameter) which ensures a solid electrical connection and efficient current transfer. Uniquely, it is terminated with a Lincoln-specific "Bell Plug" (Amphenol style) trigger connector, eliminating the need for aftermarket splicing or adapter cords when connecting to compatible Lincoln control receptacles.

Constructed to meet the demands of heavy fabrication, the gun is rated at 400 Amps with a 60% duty cycle using CO2 shielding gas. The 15-foot cable assembly utilizes high-grade copper stranding to minimize voltage drop and heat buildup, ensuring consistent arc characteristics even at the upper limits of its amperage range. The outer jacket is manufactured from durable, abrasion-resistant rubber composite, protecting the internal power cable, liner, and control wires from shop hazards such as hot slag, metal shards, and rough concrete surfaces.

From a maintenance perspective, the PT4015LPB is designed for efficiency. It utilizes the industry-standard Tweco #4 consumable platform, including 14-series contact tips, 24-series gas nozzles, and 54-series gas diffusers. This widespread compatibility ensures that replacement parts are readily available and economical, reducing long-term operating costs. The gun comes pre-fitted with a steel liner suitable for standard hard wires (0.035" - 0.045"), making it ready for immediate integration into production lines focused on structural steel, heavy equipment repair, or general manufacturing.