Sticking is a term that refers to the tendency of the electrode tip to adhere to the workpiece.
Same as: Electrode pick-up.
Elevated temperature at the electrode/workpiece interface can produce alloying conditions. Zinc coating allows a zinc copper alloy to develop at the electrode tip, promoting adhesion.
When bare steel is welded, a carbon layer forms on the tip. This layer acts as a barrier to fusion of electrode and workpiece, thereby minimizing sticking.
Sticking may also result from melting and refreezing of the workpiece coating [e.g. zinc], prior to tip removal from the work piece.
- Gun will not open
- Part pulled from fixture
- Gun open; Tips stuck to work piece
- Water flowing from electrode
- Machine control fault
- Irregular weld
Quality, Workplace Issues, Cost, Downtime, Maintenance, Throughput (cycle time; PPH) are all potentially affected by this condition.