Characteristics of tensile process in double-sided laser beam welded T-joints of Ti-6Al-4V alloy
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摘要: 采用双侧同步激光焊接的方法获得Ti-6Al-4V合金T形接头，借助红外热成像的方法，研究激光焊接T形接头拉伸过程中典型缺陷如咬边、未熔合、气孔等的影响及特征. 结果表明，拉伸过程中温度的升高虽然出现在两侧蒙皮母材中，但随着变形量的增加，接头咬边处的应力集中效应凸显，温度也在该区域出现了大幅上升，塑性变形增大，并最终在此处发生断裂. 未熔合及气孔缺陷一般处于硬化区中部，不影响该区域的强化作用，温度的大幅增加仍位于蒙皮一侧母材处，最终在温度最高点处发生断裂.
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关键词:
- Ti-6Al-4V合金 /
- 双光束激光焊接 /
- 红外热成像 /
- 拉伸过程 /
- 焊接缺陷
Abstract: T-joints of Ti-6Al-4V alloy were fabricated by double-sided synchronized laser beam welding with homologous filler wire. The influence and characteristics of the weld defects such as undercut, lack of fusion, and porosity defects during tensile process were investigated by the method of infrared thermal imaging. Results show that the temperature increased at the base metal on both sides of the skin. The stress concentration of T-joint was obvious with the increasing of deformation. The temperature and plastic deformation increased at the zone of stress concentration where the fracture occurred finally. The lack of fusion and porosity defects were located at center position of the hardening zone, the influence of strengthening effect for welded T-joint had little change. The temperature increased in base metal on one side of the skin because of plastic deformation, and the fracture occurred in base metal at the peak temperature. -
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