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FAILURE ANALYSIS & MODELLING LABS

Manufacturing Failures

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An ASTM A 234, Grade WPB, carbon steel 8 inch standard wall long radius 90degree elbow was submitted for a cause of failure analysis when it was found to be leaking after being placed in service.

The leak had taken place through a crack on the inner radius of the elbow.

Metallurgical examination had shownthat the crack in the bend was caused by a material defect, a sizable slag inclusion on the inside radius of the bend.

Slag inclusion and the metal around it   150X Magnification

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