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The Lincoln Electric W7005502 PCB HF is a critical internal component designed for specific Lincoln Electric TIG welding power sources, such as the Invertec series. This Printed Circuit Board (PCB) manages the High Frequency (HF) circuit, which is essential for non-contact arc initiation and maintaining arc stability during AC TIG welding. In TIG processes, the HF module generates a high-voltage, low-amperage discharge that ionizes the shielding gas gap between the tungsten electrode and the workpiece, allowing the main welding current to flow without touching the electrode to the metal.
Symptoms of a failing HF board often include the inability to start an arc in "HF Start" mode (forcing the operator to use Lift-Arc or Scratch-Start), erratic arc starting, or an unstable arc when welding aluminum in AC mode. If you have verified that your spark gap points (if equipped) are clean and set correctly, and that your torch and ground connections are sound, the W7005502 PCB is likely the necessary replacement to restore full functionality. This board is engineered to handle the rapid switching and high-voltage spikes inherent in the HF process, ensuring consistent ignition cycle after cycle.
Replacing the W7005502 requires opening the welder's chassis. Warning: Inverter welders contain capacitors that store lethal voltages even after the machine is unplugged. Installation should only be performed by a qualified welding equipment repair technician. Standard ESD (Electrostatic Discharge) precautions must be observed when handling this board to prevent damage to sensitive microchips. Ensure the machine is disconnected from input power and capacitors are properly discharged before attempting replacement.
| Additional Information |
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| Brand:Lincoln Electric |
| Product Type:Printed Circuit Board (PCB) |
| Function:High Frequency (HF) Control |
| Compatible Brand:Lincoln Electric |
| Component Class:Electronic Repair Part |
| Packaging Description:pack of 1 |
