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01-06-2015 | Case History---Peer-Reviewed | Issue 3/2015

Journal of Failure Analysis and Prevention 3/2015

Analysis of Micro Cracks Near Weld Line in ERW Pipe of API 5L X70M Grade

Journal:
Journal of Failure Analysis and Prevention > Issue 3/2015
Authors:
Tushal Kyada, J. Raghu Shant, Devendra Goyal, Rajesh K. Goyal, T. S. Kathayat

Abstract

A metallurgical root cause analysis was performed on Electric Resistance Welded (ERW) pipes having Ultrasonic Test (UT) indication near the weld line. Fine subsurface cracks have been observed in the ERW cracks which are found to be parallel to the weld flow line. A metallurgical cross section was drawn at UT indicated area on the ERW pipes of 406.40 mm (16 inch) diameter by 7.40 mm wall thickness and API 5L X70 PSL2 grade. Failure analysis is carried out by optical microscope and scanning electron microscopy with energy dispersive spectroscopy.

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