摘要
采用瞬时液相扩散连接技术进行了45MnMoB地质钻杆焊接试验,探讨了两种焊接工艺下接头的组织和力学性能。结果表明,在两种焊接工艺下,焊缝区晶粒已实现跨界面连续生长,焊缝区组织与母材组织相同,都为回火索氏体。与传统单温焊接工艺相比,1250～1230℃双温焊接工艺获得的接头无异质界面、焊合率高,接头抗拉强度为890MPa,弯曲180°不裂,达到了地质钻杆焊接接头技术要求。另外,采用瞬时液相扩散连接工艺获得的地质钻杆接头成形好,焊后无需机械加工,降低了钻杆的制造成本。
The geological drill pipe(45MnMoB steel)was joined by transient liquid phase bonding with a novel two-step heating process.The mechanical properties and microstructures of the joint were investigated,and compared with those of the joint produced by the conventional heating process.The results showed that both the heating processes produced a homogenous joint with microstructure and composition equivalent to the base metal.Compared with the conventional one-step heating process,the two-step heating process(1 250 ℃,1 min and 1 230 ℃,2 min)remove the dissimilar interfaces,and increased the bonded ratio,and get the joint with tensile strength of 890 MPa and bending degree of 180°,which exceeded the technical criterions of geological drill pipe.As this technology can be applied in drill pipe production without postweld machining process,and the production costs will be reduced.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第5期53-56,共4页
Transactions of The China Welding Institution
基金
国家科技成果重点推广计划资助项目(2005EC000213)
关键词
地质钻杆
45MnMoB
瞬时液相扩散连接
双温工艺
力学性能
geological drill pipe
45MnMoB steel
transient liquid phase bonding
two-step heating
mechanical properties
