大连起重机器厂与大连铁道学院焊接教研室合作,对起重机主梁焊接后的残余应力进行了测量。测量采用两种方法,即X射线法与小孔松弛法。为了保证测量数据的可靠,选用了5吨10.5米的桥吊主梁一段作试件,在大连铁道学院试验室进行试验,以比较两种测量方法 Dalian Crane Factory and Dalian Railway Institute Welding Department cooperation, crane crane girder residual stress after welding were measured. Two methods of measurement are used, X-ray method and pinhole relaxation method. In order to ensure the reliability of the measurement data, a 5-ton 10.5-meter bridge crane girder section was selected as a test piece and tested in the laboratory of Dalian Railway Institute to compare the two measurement methods