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采用钨极氩弧焊工艺焊接TC6钛合金,并进行焊前预热和焊后真空热处理,对获得的焊接接头进行了气密性和无损检测,以及X射线衍射试验,分析了焊缝区、热影响区的显微组织和接头性能。结果表明:采用焊前预热和焊后真空热处理工艺得到的焊接接头满足使用性能的要求,在焊接接头的焊缝金属中有少量的针状α′,并形成了编织状的α组织,热影响区为α+β双相组织,同时在焊接接头中产生了少量脆性Al3Ti相。
The TC6 titanium alloy was welded by the TIG welding process, and the preheating and post-welding vacuum heat treatment were performed. The obtained welded joints were tested airtightly and non-destructively, and the X-ray diffraction tests were carried out. The weld zone, Heat affected zone microstructure and joint properties. The results show that the welded joint obtained by preheating and post-weld vacuum heat treatment process meets the requirements of serviceability. There is a small amount of needle-like α ’in the weld metal of the welded joint and a braided α-structure is formed. The heat The influence zone is α + β duplex structure, and a small amount of brittle Al3Ti phase is produced in the welded joint.