NONDESTRUCTIVE MONITORING OF VARIATIONS OF RESIDUAL STRESSES IN STEEL WELDMENTS BY MAGNETIC BARKHAUSEN NOISE METHOD

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GÜR C. H., Erian G., BATIGÜN C., ÇAM İ.

ASME Pressure Vessels and Piping Conference (PVP-2013), Paris, France, 14 - 18 July 2013, (Full Text)

• Publication Type: Conference Paper / Full Text
• City: Paris
• Country: France
• Middle East Technical University Affiliated: Yes

Abstract

Variations of surface residual stresses as a function of weld runs in API 5L X70 steel plates were non-destructively monitored by Magnetic Barkhausen Noise (MBN) method. After each weld run, MBN signal and hardness distributions were recorded. MBN signals were converted into stress values by using a specific calibration procedure. The results were analyzed by considering microstructure investigations and hardness measurements, and then, they were compared with the results of X-ray diffraction measurements. MBN method seems to be a good candidate for monitoring the variation of surface residual stresses. It may also provide critical data for computer simulation and process design of welding processes.