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Excessive Indentation

Definition

Excessive Indentation occurs when the depression left by the electrode on the workpiece exceeds the manufacturer’s specification.

Description

Indentation on at least one side of the workpiece is an essential part of resistance welding.

Acceptable indentation and the method of measurement may vary among manufacturers. The weld classification (Class A, Cosmetic, Common, etc.) may also influence the acceptable indentation. Acceptable indentation may be different on each side of the workpiece. Some electrode configurations may produce nonsymmetrical indentations (e.g. truncated cone with flat cap).

Detection

Visual inspection
Measurement per manufacturer’s specification

Significance

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

Possible Causes

Strong Possibilities

Weak Possibilities

Excessive Indentation

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