激光冲击处理对TC4氩弧焊焊缝力学性能的影响

Influence of Laser Shock Processing on Mechanical Properties of TC4 Titanium Alloy TIG Welding Bead

摘要:

采用激光冲击处理 (LSP) 工艺对TC4钛合金钨极氩弧焊焊缝进行焊后处理，分别检测经过激光处理的焊缝及未经处理的焊缝的表面显微硬度、接头的拉伸性能、接头的疲劳寿命。结果表明：与未经LSP处理的接头相比，TC4钛合金TIG焊焊缝经过激光冲击强化处理后，焊缝区域表面显微硬度降低，而焊缝热影响区表面显微硬度增大；焊接接头的抗拉强度、屈服强度、断后延伸率、疲劳寿命均得到了不同程度的提高

Abstract:

Laser shock processing (LSP) was employed to treat TC4 titanium alloy Tungsten Inert Gas (TIG) welding joints. HV hardness, tensile property and fatigue life of the TC4 titanium alloy TIG welding joints and the untreated joints were studied. Compared with those joints keeping primal TIG weld bead, microhardness of LSP treatment welding bead zone surface is reduced; however, that of welding heat affected zone surface is are increased. Tensile strength, yield strength, specific elongation, and fatigue life of LSP treatment joints are improved to different extent.