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试验研究了TC2钛合金CO2激光焊接接头的组织与静态力学性能。研究表明,高功率下焊接接头的横截面形貌随着线能量的增大由X型向U型转变,低功率时焊接接头的横截面形貌随着线能量的增大由T型向U型转变。激光焊接接头的焊缝区显微组织由α、针状马氏体α′和少量β相组成。力学性能分析表明,焊缝区的硬度比母材高约60 HV,热影响区硬度最低且相邻位置变化较大,静态拉伸时焊接试片一般断裂于接头热影响区附近,强度为945~975 MPa。
The microstructure and static mechanical properties of TC2 titanium alloy CO2 laser welded joints were studied experimentally. The results show that the cross-sectional morphology of welded joints changes from X-type to U-type at high power, and the cross-sectional morphology of welded joints decreases with the increase of linear energy from T-type to U- Type change. The weld zone microstructure of laser welded joints consists of α, acicular martensite α ’and a small amount of β phase. Mechanical analysis shows that the hardness of the weld zone is about 60 HV higher than that of the base metal, the hardness of the HAZ is the lowest and the change of the adjacent position is relatively large. The welding test strip generally breaks near the HAZ of the joint under static tensile strength and has a strength of 945 ~ 975 MPa.