Porosity

Porosity is when pockets of air become trapped in the weld nugget.

Probable Causes:

	Concave surface on weld tips.
	Incorrect Machining of weld tips.
	Weld tips with ridge around the diameter of the tip surface.

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 a porosity ultrasonic inspection graph looks like:

	Porosity Attenuation Graph
	Porosity Spacing Graph
	Porosity Interface Echoes Graph