Genuine OEM service parts for the Lincoln Square Wave TIG 200 (K5126-1) — Lincoln's mid-range AC/DC TIG welder for aluminum, stainless, and carbon steel TIG welding in shop and light production environments. WeldingMart stocks in-demand Square Wave TIG 200 service parts for minimum downtime.
The Square Wave TIG 200 delivers AC TIG for aluminum and DC TIG for steel and stainless from a portable 200A inverter platform. Its high-frequency arc start circuit, AC frequency control board, and output stage components are the most common service items on this machine. When diagnosing a Square Wave TIG 200 fault, confirm whether the issue presents on AC, DC, or both processes before ordering a board — AC and DC output stages are on separate circuits in this machine. Use your serial number for revision-specific board confirmation.
Square Wave TIG 200 Parts by Category
Electronic Components
- PC Boards & Control Boards
- Switches & Circuit Breakers
- Terminals, Connectors & Receptacles
- Wiring Harnesses & Internal Cables
Torch & Output Components
Mechanical & Structural
Related TIG Resources
- Lincoln Square Wave TIG Welders
- All Lincoln Electric OEM Service Parts
- Lincoln Electric Service Parts Hub
Order by Lincoln part number or call WeldingMart with your Square Wave TIG 200 serial number for part confirmation. Most in-stock parts ship same or next business day.