1 Whether the grounding wire is in poor contact, the grounding wire must be clamped on the workpiece with a special grounding wire clamp. Poor grounding may lead to abnormal incoming line.

2 Whether there is oil stain, embroidery scale, paint moisture and other sundries on the surface of the workpiece, which will also cause abnormal wire feeding due to high resistance and poor contact.

3 whether the contact is seriously worn, whether there is welding current and no load when manual wire feeding. Once the welding is loaded, the wire feeding abnormality caused by the serious wear of the contact nozzle will appear immediately.

4 Whether the extension length of welding wire is appropriate, usually the diameter of welding wire is 10 times the diameter of welding wire, for example, the diameter of welding wire is 1.0 mm, and the extension length of welding wire is about10 mm..

5 Check whether the thread pressing wheel is loose, and adjust the thread feeding pressure clockwise if necessary. No-load wire feeding is normal, and problems will occur immediately when there is load.

6 Check whether the welding torch switch contact is in poor contact. The switch is a vulnerable part, and poor contact after long-term use will also affect wire feeding.

Let's stop here. Please check them one by one.