The effect of multiple repairing weld and TIG-dressing on T-shape joints weld bead fatigue strength

摘要

The effects of multiple repairing weld on the stress concentration and the fatigue property of high strength steel weld joints used in platform have been investigated. Through the fatigue tests on high strength welded joint specimens,the life estimating formula and S-N curves are obtained after each time of repairing weld. The stress concentration factors of weld toe change because of changes of toe angles induced by outward-move of toe. The relation of the stress concentration factor between the times of multi-as-welded is found. By comparison and analysis of test results of each time,prolong the platform life and the effect of the times of repairing weld has been examined. Weld bead property of the high strength steel welding joints is studied in this paper.