Cause: Electrode Faces Not Parallel to Workpiece

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Definition
Electrode faces not parallel to workpiece after tips have been closed.

Description
Line joining center points of contact areas is not perpendicular to workpiece.

Detection
A nonparallel electrode face condition may be detected through one or more of the following symptoms:

• Excessive indentation
• Expulsion/burn through
• Nonround weld
• Poor Class A appearance
• Sheet metal distortion
• Sticking/stuck tips
• Undersized weld
• Uneven indentation
• Visible nonparallelism of faces when the gun/fixture is closed

Significance
Quality, Workplace Issues, Cost, Downtime, Maintenance, Throughput (cycle time; PPH), are all potentially affected by this condition.

Subordinate Causes

• Incorrect electrode dressing
• Wrong shank
• Wrong tips