核电热交换器用耐蚀钛焊管制备工艺研究

Study on Preparation Process of Corrosion Resistant Titanium Weld Tubesfor Nuclear Heat Exchange

采用"W+双半径"反弯成型方法将钛带弯曲成型,用非熔化极钨极氩弧焊进行焊接,试制出规格为?25.4 mm×0.5 mm的核电热交换器用耐蚀钛焊管。采用金相显微镜、电子万能试验机和氧氮氢联测仪等对试制的钛焊管的金相组织、焊缝宏观形貌、力学性能、工艺性能、化学成分等进行了检测和分析。结果表明:当焊接电流为120 A、焊接电压为11 V时,制得的钛焊管焊缝接头质量最好,化学成分、显微组织和力学性能各项指标均满足核电热交换器用耐蚀换热管的技术要求。

The titanium strip was bent by “W+double radius” reverse bending method and welded by non melting tungsten argon arc welding, then the corrosion resistant titanium weld tube with specification of ?25.4 mm×0.5 mm for nuclear heat exchange was produced. The metallographic structure, weld macro morphology, mechanical and technological properties, chemical composition and some other properties of titanium weld tube were tested and analyed by metallographic microscope, electronic universal testing machine and oxygen, nitrogen, hydrogen joint tester.The results show that when the welding current is 120 A and the welding voltage is 11 V, the quality of the welded joint of titanium weld tube is the best, and chemical composition, microstructure and mechanical properties of the tube are all meet the technical requirements of the corrosion resistant heat exchange tube for nuclear heat exchange.