Excessive Indentation

Excessive Indentation occurs when the weld has formed, but the Weld Tips penetrated the surface of the metal by more than 30% of the metal thickness.

Probable Causes:

	Weld tip force is too low.
	Weld current is too high.
	Weld tip cooling is insufficient.
	Weld time is too long.
	Squeeze time is too short.
	Hold time is too long.

Detecting this condition with Ultrasonic Inspection:
Ultrasonic inspection allows you to non-destructively identify acceptable and defective Weld Nuggets. During ultrasonic inspection, a transducer probe sends sound waves through a weld nugget and the results are displayed graphically. The three conditions that are analyzed from the graph are Attenuation, Spacing, and Interface Echoes.

What a good weld ultrasonic inspection graph looks like:

	Good Weld Attenuation Graph
	Good Weld Spacing Graph
	Good Weld Interface Echoes Graph

What an excessive indentation ultrasonic inspection graph looks like:

	Excessive Indentation Attenuation Graph
	Excessive Indentation Spacing Graph
	Excessive Indentation Interface Echoes Graph