Service and Maintenance
B-36
GLC 353/503/553 MC3
- No welding current or very little supplied by machine:
1. Loose contact or arcing at:
- welding current connection lug (P)
- welding current connection lug (N)
- torch connection
- central connection (wire drive unit)
- earth connection
- workpiece clamp (welding ground)
2. Fault in the welding machine
Wire drive unit does not work properly:
1. The wire feed parts (wire drive roller etc.) fitted are for the wrong diameter wire.
2. The wire is bent.
3. The surface is not clean.
4. Counter pressure roller is loose.
5. Wire coil brake is too tight.
6. Tolerance within wire drive is not correct.
Weld seams are porous:
1. Component severely rusted or contaminated by paint/oil or double plate.
2. Distance between welding torch and workpiece is too large.
3. Leaking gas supply.
4. Porosity caused by magnetic blowing action of the welding material. As
preventive measure always keep welding movement away from the workpiece
clamp.
5. Welding torch is held too flat.
6. Gas flow is set too high or too low.
7. Polluted or incorrect gas.
8. Cross wind blows away the shielding gas, i.e. due to open doors or fans.
S1 Problems during operation
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