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大连机车车辆厂焊接科于今年1月和2月上旬,先后作了二次铸钢件缺陷应用多条焊补的试验,并已获得满意的结果。该厂原来是用炭极弧焊修补铸钢件缺陷,经试验证实,这种焊补方法因焊池缺乏脱氧和气体保护等作用,而熔敷金属质量低劣,远不能满足产品的机械性能。以后改用优质焊条(该厂自制З-42型焊条)进行焊补,
Dalian Locomotive and Rolling Stock Plant Welding Branch in January of this year and early February, has made a second cast steel defects applied a number of welding test, and have been satisfied with the results. The factory originally used carbon arc welding to repair steel castings defects confirmed by the test, this welding method due to the lack of welding deoxidation and gas protection and other functions, and deposited metal quality is poor, far from meeting the mechanical properties of products. After the switch to high-quality welding rod (the factory-made З-42 electrode) welding repair,