以7075铝合金试样的搅拌摩擦焊接头为对象,利用激光喷丸和常规喷丸工艺对其进行后续处理,通过试验对比分析了激光喷丸工艺对表面粗糙度、显微硬度、接头残余应力、裂纹扩展、疲劳寿命的影响.结果表明,经激光喷丸处理的搅拌摩擦焊接头的表面粗糙度远小于常规喷丸处理的接头表面,而对接头显微硬度的影响差异不大.激光喷丸可改变接头的残余应力分布,是增强搅拌摩擦焊接头抗疲劳性的有效方法,对其他焊接接头及构件的激光喷丸处理具有一定的参考价值.
The effect of laser peen and shot peen trentments on the friction stir welding(FSW) joints of 7075 a-luminum alloy was investigated. The effect of these treatments on surface roughness, micro-hardness, residual stress, crack extension and fatigue life was analyzed. The test results show that the surface roughness of laser peened FSW joint is much better than that of shot peened FSW joint, the micro-hardness of FSW joints is similar for different treat-ments. The residual stress distribution of FSW joints can be changed by laser peen, so laser peen is an effective way to increase fatigue strength for FSW joints. The test results may serve as a reference for laser peen on some other weld-ing joints and components.
参考文献
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