Steel coils are welded end to end for processing in a continuous galvanizing line of a cold rolling mill. Failure of the welds in the line during processing results into mill stoppages causing huge production downtime. An automated ultrasonic-based non-destructive measurement system for assessing the weld integrity of 0.6–2-mm-thick steel sheets immediately after welding is described. The system was designed to detect any physical weld defects, viz., lack of fusion, expulsion, cracks, etc., which compromises the integrity of weld leading to its failure in the processing line. A high-frequency ultrasonic probe with an integrated water chamber was designed for enabling high-speed non-contact automated inline inspection of the weld considering the limited inspection time available in the mill (40 s). A prototype scanning system was made using the developed ultrasonic probe which was successfully able to detect the weld defects formed in actual plant samples.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Jan 24, 2017
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