中碳调质钢30CrNi3焊接工艺及生产应用

摘要

特高压断路器的重要元件密封杆材料为30CrNi3,其结构为两端封闭的中空焊接结构,30CrNi3为中碳调质钢,综合机械性能和工艺性能良,焊接性差.通过对30CrNi3进行焊接性分析,制定焊接工艺方案,进行焊接工艺试验,确定最佳的焊接工艺参数,焊接并制作试件,采用渗透检测、射线检测等无损检测方法对焊缝的表面及内部质量进行检验,同时通过焊接接头拉伸弯曲试验,验证接头的机械性能.将焊接工艺试验研究结果应用于特高压断路器密封杆的焊接,取得了良好效果.%Sealed rod is an important component in UHV circuit breaker,the material is 30CrNi3,its structure is closed at both ends of the hollow welded structure,30CrNi3 is one of the medium carbon quenched and tempered steels,which has better comprehensive mechanical and process performances,but with poor welding performances.The optimal welding technology programs were determined by weldability analysis on 30CrNi3,the welding were determined parameters by welding procedure test.The non-destructive testing of RT and PT were used to verify the welded joints quahty of superficial and internal.Meanwhile,mechanical performance test also used to validate the mechanical properties of welded joint.The above optimal welding parameters were used to weld airproof pole,which possess the good results.