The experimental study for fatigue behavior of weld line by third TIG-dressing

In this paper, the third TIG-dressing technology is used for the weld-line after secondary TIG-dressing and its fatigue life is higher in high stress region. But the fatigue life after third TIG-dressing is decreased in low stress region. The effects of third repairing weld and TIG-dressing on the fatigue property of high strength steel weld joints used in platform have been investigated. The life estimating formula is obtained after third repairing weld and TIG-dressing. The S-N curve and the equation after third TIG-dressing are given.