TC2钛合金薄板CO_2激光焊接接头组织与性能研究

Research on Microstructure and Mechanical Properties of TC2 Alloy CO_2 Laser Welded Joints

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 properties of TC2 titanium alloy was analyzed. The results show that the macro-appearance of the welding joints changes from X pattern to U pattern using high power but the macro-appearance of the welding joints changes from T pattern to U pattern with low power. The laser welded joints are composed of weave structure with α, acicular martensite α′ and β-phases. The microhardness of the weld zone is highest, about 60 HV more than that of the base material. The microhardness of the HAZ is lowest and different. The tensile strength of the welded joint is 945-975 MPa and the fracture position is around the HAZ.