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Title: Charpy toughness of ERW seam welds
Downloadable: Yes 
Catalog No.: 2411s
Date of Publication: 2017-09-01
Price: $25.00 US
Authors: Dr Su Xu, Andrew Laver, Jim Gianetto, Jie Liang, Dr William R. Tyson, and Shinya (Matt) Matsuno
Abstract: TEN CONTEMPORARY ERW pipes were examined to investigate the influence of Charpy notch position on measured impact toughness of electric-resistance-welded (ERW) pipe in the seam-weld region. The weld bond line (BL) regions have been found to be quite narrow (width approximately 0.2-0.25 mm), with microstructures similar to or finer than the adjacent regions and base steels. Little texture was present in the BL regions after the ERW weld and post-weld heat-treatment (PWHT) processes. Micro- hardness profiles in the ERW weld region showed small through-thickness variations (average standard deviation/average: 5.4%) and indicate that contemporary ERW BL regions normally have a small weld strength over-match over the base metal but not necessarily at every through- thickness position. Charpy bond-line toughnesses showed relatively large scatter. The toughness is lowest within a narrow zone ±? 0.5 mm of the weld-fusion line. The results have been used as a scientific basis for revising the ERW pipe toughness requirements in the Canadian linepipe standard.
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