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钛合金激光焊接过程的不稳定性并不是由于焊接工艺参数波动而引起的偶然现象，而是激光焊接方法所固有的一种规律性，其特征表现为，在一定的焊接工艺区间，焊缝熔深和熔宽无规则剧烈波动，焊接模式在稳定热导焊和稳定深熔焊之间来回跳变，因此，钛合金的激光焊接应具有上下两个能量临界点。在小孔形成的临界条件附近，光导致等离子体对激光能量吸收的波动与钛合金材料汽化过程的非平衡特性是产生钛合金激光焊接过程不稳定性的根本原因。本文在深入分析钛合金激光焊接过程不稳定性产生机理的基础上，结合激光焊接过程能量传输的特点，提出钛合金激光焊接稳定性临界条件的计算模型。
The instability of titanium alloy laser welding process is not due to accidental fluctuations caused by the welding process parameters, but a regularity of the laser welding method, which is characterized by that in a certain welding process interval, Irregular deep and melting wide fluctuations, the welding mode in the stable thermal welding and stable welding between the transition back and forth, therefore, titanium alloy laser welding should have two energy up and down the critical point. Near the critical conditions of the formation of small holes, the fundamental reason for the instability of laser welding of titanium alloys is the non-equilibrium nature of the fluctuation of laser energy absorption caused by light and the vaporization process of titanium alloy. Based on the in-depth analysis of the mechanism of instability in laser welding of titanium alloy and the characteristics of energy transmission in laser welding process, a computational model of the critical conditions of laser welding stability of titanium alloy is proposed.