工艺参数对钛合金激光T型接头焊缝成形及剪切力的影响

文摘采用连续激光焊工艺焊接TC4/TA15激光T型接头,运用体式显微镜及拉伸试验机对接头进行测试分析,研究工艺参数对激光T型接头焊缝成形及剪切性能的影响。结果表明:在其他参数保持不变的情况下,随着激光功率在一定范围内的提高,焊接速度在一定范围内的降低,骨架熔宽及骨架熔深增加;骨架熔宽是影响激光T型接头剪切性能的决定性参数,匹配激光功率超过4.1 kW、焊接速度低于80 mm/s、离焦量为-5~+10 mm,可使骨架熔宽超过0.51 mm,接头剪切力达到14 kN以上水平。

Effect of Weld Parameters on Weld Appearance and Shearing Resistance of Laser Welding T-Joints of Titanium Alloys

T-joints of TC4 and TA15 titanium alloys have been welded by continuous wave laser beam.The effect of weld parameters on weld appearance and shearing resistance of the joints have been analyzed using metalloscope and tensile testing machine. The experimental results showed that when other parameters were fixed, the weld width and depth of skeleton was improved with the increase of laser beam power and decrease of weld speed. The weld width of skeleton was the determining parameter of shearing resistance of laser welding T-joints. With the laser beam power over 4.1 kW, weld speed less than 80 mm/s and defocusing amount between -5 and +10 mm, the weld depth of skeleton reached 0.51 mm, the shearing resistance of the joints reached 14 kN.