To examine the statistical fatigue life properties of welded joints, fatigue tests were performed on a number of butt-welded specimens, in parallel with similar tests conducted on small specimens spliced from larger butt-welded plates. Based on a statistical test, it was concluded that the distribution characteristics of crack initiation life for the butt-welded joint were successfully evaluated by the results for the spliced specimens for a certain definition of the crack initiation. The definition of crack initiation was based on a fracture mechanics similitute approach.

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