K940-75 - Lincoln Electric STT Voltage Sensing Lead 75ft

Maximize Your STT Performance

Unlock the full potential of your Lincoln Electric welding system with the K940-75 STT Sense Lead Kit. Designed specifically for the Surface Tension Transfer (STT) process, this 75-foot accessory is more than just a cable—it is the communication link that ensures your welds are flawless. The STT process is renowned for its ability to weld thin gauge materials with low heat input and minimal spatter, but it requires precise feedback to function correctly. This sense lead kit provides that feedback by monitoring voltage directly at the arc, independent of the welding current cables.

Accurate Feedback for Superior Welds

In any welding circuit, the heavy cables carrying the welding current naturally resist the flow of electricity, causing a drop in voltage between the machine and the work. This voltage drop fluctuates with current and cable length. The K940-75 acts as a dedicated sensing line that carries virtually no current, meaning it experiences no voltage drop. It reports the exact voltage at the weld puddle back to the power source. This allows the Lincoln Electric power source to react in microseconds to changes in the arc, maintaining the perfect conditions for the STT waveform. The result is a stable arc, excellent fusion, and a drastic reduction in post-weld cleanup.

Ready for the Shop Floor

The K940-75 is constructed with the professional welder in mind. Its 75-foot length (22.8 meters) offers significant flexibility, allowing operators to move freely around large workpieces without moving the power source. The cable is flexible yet durable, capable of withstanding the wear and tear of daily shop use. Whether you are welding pipe, automotive components, or performing critical maintenance, this sense lead kit is the key to consistent, code-quality welds. Don't let cable resistance compromise your work; ensure accuracy with the Lincoln K940-75.