天井クレーン模擬プログラム荷重下の溶接補修材の疲労強度

概要

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To assess the effectiveness of various repair schemes for components of an overhead crane, weld repaired gusset specimens, several kinds of plate specimens with cracks repaired by welding, and cover plate specimens were fabricated, and the fatigue strength was determined for various specimens subjected to a simulated program loading of an overhead crane. The fatigue strength of weld repaired gusset plate specimens was found to be approximately the same as that of as-welded ones. The fatigue strength of weld repaired specimens with partial-penetration of welds decreased with an increase in the initial crack length. In case of the one-surface weld repaired specimens, the fatigue strength was not enough, while the specimens with cracks completely repaired by welding from both surfaces displayed sufficient fatigue strength to satisfy the requirement of a design code of cranes. In case of the one-surface cover plate specimens, the fatigue strength reduced significantly due to high stress concentration. Hence, this type of cover plate is an inadequate repair method.
1998-10-25