Abstract
An analysis of the stress intensity factor is made for a crack vertically approaching the welding line in an infinite plate. The simple equations proposed by the author and others were employed in the analysis as the distribution function for the residual stress caused by welding. The effects of crack location, or the eccentricity, and the crack length on the stress intensity factor may be obtained not when the crack center coincides with welding line but when the crack front approximately reaches the welding line. For the better understanding of the behavior of a crack approaching the weldment, analysis was also carried out for a crack with various length but constant eccentricity. It was found that the stress intensity factor whips once, when the crack front go accross the welding bead.
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