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METHOD FOR MINIMIZING FATIGUE DAMAGE IN WELDED STRUCTURE TOOL FOR FORMING STRIKE MARK AND WELDED STRUCTURE
METHOD FOR MINIMIZING FATIGUE DAMAGE IN WELDED STRUCTURE TOOL FOR FORMING STRIKE MARK AND WELDED STRUCTURE
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机译:最小化焊接结构模具中疲劳损伤的方法,以形成划痕和焊接结构
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摘要
A method for minimizing fatigue damage in a welded structure by minimizing the fatigue damage produced in the welded portion of the welded structure. In this method a substantially linear weld bead is curved in an arc shape along a direction that transverses the weld bead at a right angle on the surface of a base material adjacent to the bead in the welded portion and a strike mark is formed through hammer peening or ultrasonic shock peening using a tool for forming a strike mark having at the tip a strike mark forming surface with the center of curvature skewed to one side of two end surfaces mutually parallel along the weld bead; a strike mark is formed on the surface of the base material adjacent to the substantially linear and curved weld bead through hammer peening or ultrasonic shock peening using a tool for forming a strike mark having at the tip a planar strike mark forming surface with an overall circular or elliptical shape; and fatigue damage on the welded portion is minimized by introducing compressive residual stress in the vicinity of a weld bead toe with the tool for forming a strike mark.
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