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概要

Weld pass sequence generally affects residual stress profiles. In this study, the profiles of a multi pass bead on plate specimen were experimentally and analytically examined. Material used in this study was the low alloy steel SQV2A (JIS G 3120). Phase transformation usually occurs around welded area in SQV2A and also affects the profiles. Five pass bead on plate specimen was fabricated. Residual stress profiles of the specimen were measured by using the strain relief method. Longitudinal residual stress around the last pass area of the specimen was lower than that around the previously welded pass area. The longitudinal residual stress profile in the previous welded area, where passes from the 1st to the 4th were welded, was higher than that of the last pass area. Residual stress analysis with considering phase transformation strain was carried out. The analysis results show good agreement with the experimentally measured results. These findings show that residual stress occurred around the welded area and that residual stress around the last pass area was lower than that of the previous pass area due to phase transformation strain.

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