The effect of TIG-dressing on fatigue strength in support of the fillet weld of offshore platform was investigated experimentally in the paper. According to the causes in which most cracks are produced in actual structure, the model tests have been performed based upon cruciform weld bead characteristic. The TIG-dressing technique parameters were established by the actual structure and the fatigue specimen tests were done also. The life estimation equation after TIG-dressing is presented by least square method. The fatigue life used by TIG-dressing has increased over 100%. Therefore the TIG-technique gives a big potential for engineering application.
The effects of multiple repairing-weld and TIG-dressing on the fatigue property of high
strength steel weld joints used in platform have been investigated. Through the fatigue tests on high
strength steel welded joint samples, the life estimating formula is obtained after each time of
repairing weld and TIG-dressing. The S-N curve and the equation after repairing weld and
TIG-dressing are given. The work in this paper offers an important basis for the multiple
repairing-weld of platforms.
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