Mechanism of Production of Residual Stress due to Slit Weld

概要

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In actual structures, slit weld connections are used frequently. In this case, large portion of weld cracks is detected in the first weld. In order to avoid weld cracks, it is important to investigate the mechanical behavior of slit type connection. It has been reported that the conventional concept of restraint intensity cannot predict the resulting residual stress due to slit weld on small size of specimen. A series of thermal elastic-plastic analysis was performed on plates different in size and slit length. It may be concluded that there are three kinds of deformation which cause thermal stress ; (1) the shrinkage of the weld metal, (2) locally confined thermal deformation of the base plate, and (3) over-all deformation of the base plate. In case of short slit, the over-all deformation is the main cause of thermal stress. In case of long slit, this does not play an important role and then the conventional concept of restraint intensity is applicable to estimate the residual stress.
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