TA12钛合金电子束焊接接头性能和断口分析

利用电子束焊接方法,焊接厚6mm的TA12钛合金板材.通过拉伸实验、持久实验和疲劳实验对焊接接头的力学性能进行研究,同时对疲劳断口进行分析.结果表明:在室温和550℃时,焊接接头强度与母材相当；在室温时,焊接接头的塑性与母材存在明显差异,焊接接头的延伸率与母材相比有所下降；而在550℃时,焊接接头塑性与母材相当或略大....

Analysis on the properties and fractures of welding joints of TA12 alloy electron beam

The electron beam welding is used for TA12 alloy of 6mm thickness in this paper.The properties of TA12 alloy joints welded by the electron beam are investigated by tensile test,lasting test and fatigue test,at the same time the fatigue fractures are analyzed.The results show that at room temperature or 550 ℃,the tensile strength of welded joints are not less than the base;the plasticity of joints especially under room-temperature are obviously different with it of the base and the elongation of the welded joint declined comparing with the elongation of the basethe plasticity of welded joints are correspond the bases or slightly larger at 550℃.Fatigue fracture position is usually at fuse zone near fuse line,and crack is under sub surface source area.Blow holes exist in welded joints,but crack source caused by blow hole is no observed.Blow holes accelerated crack propagation in fatigue experiment,and the closer to the surface they influence the more massive for fatigue performance.