673579 - ESAB High Frequency Spark Gap Unit with Heatsink

Restore Precision Ignition with the ESAB 673579 Spark Gap Assembly

The ESAB 673579 Heatsink Spark Gap Assembly is a critical internal component designed for specific ESAB welding power sources. In the world of TIG welding and plasma cutting, the ability to establish an arc without touching the electrode to the workpiece is paramount for maintaining tungsten integrity and preventing weld contamination. This functionality is achieved through a High-Frequency (HF) start circuit, and at the heart of many of these circuits lies the spark gap assembly.

Over time, the high-voltage electrical discharges that occur across the spark gap points can cause erosion, pitting, or oxidation. When this happens, the welder may experience "hard starting," erratic arcs, or a complete failure of the HF system. This genuine ESAB replacement part is engineered to restore your machine's original performance. It comes as a complete assembly, featuring precision-aligned conductive points and a robust heatsink. The heatsink is essential for dissipating the thermal energy generated during the rapid electrical discharges, ensuring the longevity of the component and the stability of the arc.

Using genuine OEM parts like the 673579 ensures that the electrical resistance, gap spacing, and thermal properties match exactly what the machine's control board expects. Generic replacements or attempted repairs of worn spark gaps can often lead to further issues, including damage to the high-voltage transformer or inconsistent welding output. This assembly is designed for straightforward installation by qualified repair technicians, allowing you to get your equipment back into production with minimal downtime.

Whether you are troubleshooting an older Heliarc machine or a modern inverter that utilizes a spark gap oscillator, verifying the condition of this assembly is a standard maintenance step. If your machine struggles to initiate an arc or if the HF buzzing sound has become weak or intermittent, the ESAB 673579 is likely the solution required to bring your equipment back to peak operating condition.