1. Contact Tip Inspection and Replacement
When the contact tip wears and the bore diameter increases, arc instability, poor weld appearance, or wire burn-back can occur. If spatter adheres to the contact tip end, wire feeding becomes uneven. If the contact tip is not tightened properly, the threaded connection can overheat and weld itself.
2. Spring Liner Cleaning and Replacement
After long-term use, spring liners accumulate iron powder, dust, and wire plating debris, causing unstable wire feeding. Regular cleaning is important:
- Coil the liner and tap lightly to shake out accumulated material, then blow with compressed air.
- Use a brush in oil to clean oil deposits, then blow with compressed air.
- If the liner is kinked or severely deformed, replace it with a new one.
- When replacing, confirm it matches the wire diameter and length. Ensure the cut end has no burrs.
3. Insulation Ring Inspection
If welding without the insulation ring, spatter will adhere inside the nozzle and conduct between the nozzle and live parts. The torch may burn out due to short circuit. To ensure uniform shielding gas flow, always install the insulation ring.
