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采用超声波对Q415NH耐候结构钢焊接接头进行冲击处理,并对超声波处理前后的两组试样分别进行了透射电镜分析、显微维氏硬度测试、疲劳强度试验,研究其超声波处理前后疲劳性能的性能变化。结果表明:超声波冲击处理能明显细化焊趾表面处晶粒,有助于提高其力学性能;处理后的焊接接头表面硬度得到一定程度的提高,强度提高;超声波冲击后焊件的疲劳性能得到大幅度提高。
The welded joint of Q415NH weatherable structural steel was impacted by ultrasonic waves. The transmission electron microscopy, micro Vickers hardness test and fatigue strength test of two groups of samples before and after ultrasonic treatment were carried out to study the performance of fatigue properties before and after ultrasonic treatment Variety. The results show that the ultrasonic impact treatment can remarkably refine the grain size at the weld toe surface and improve the mechanical properties of the weld toe. The surface hardness of the welded joint is improved to a certain degree and the strength is improved. The fatigue property of the weldment after ultrasonic impact is obtained substantial improvement.