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采用Nd∶YAG脉冲激光作为焊接热源,对TC4钛合金进行平板拼焊焊接实验,并结合焊接过程中产生飞溅的情况、焊缝表面宏观形貌颜色的变化情况及熔深熔宽的变化情况三个方面,详细分析了峰值功率和脉宽对焊缝成形的影响。实验结果表明:其他工艺参数一定时,满足焊缝表面基本无氧化的峰值功率——脉宽关系图呈近似“直角三角形”;当峰值功率一定时,随着脉宽的增加,熔深和熔宽均增加,当脉宽一定时,随着峰值功率的增加,熔深和熔宽也均增加,且两种情况下熔深的增幅均大于熔宽的增幅。
The Nd: YAG pulsed laser was used as welding heat source to carry out the plate welding welding on TC4 titanium alloy. The changes of the macroscopic topography and the change of melt penetration width On the one hand, the impact of peak power and pulse width on the weld formation is analyzed in detail. The experimental results show that the peak-to-pulse-width relationship of the weld surface with almost no oxidation is similar to the “right-angled triangle” when the other process parameters are constant. When the peak power is constant, as the pulse width increases, Both the depth and the melting width increase. When the pulse width is constant, the penetration depth and the melting width increase with the increase of the peak power. In both cases, the penetration depth increases more than the melting width.