激光深熔焊中侧吹保护气体方法用于降低等离子体中的电子密度抑制等离子体，TIG中活性焊剂也有吸收电子的作用。
The method of blow, side protecting gas in laser deep welding is used to reduce the electronic density of plasma, also, the active flux in TIG can absorb electron.
以动量守恒原理为基础，建立了侧吹射流轴轨迹的数学模型。
A mathematical model for the trajectory of the jet axis was proposed on the principle of momentum conservation.
结果表明，侧吹喷嘴高度和侧吹流速的变化对光致等离子体行为和焊缝形貌有显著的影响；
The result shows that laser induced plasma and weld geometry are sensitive to side nozzle height, its inclination angle and side gas flow rate;
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