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采用２．５ｋＷＣＯ２激光器焊接不锈钢，设计一个由两个同轴圆管组成的双层喷嘴，研究了Ａｒ和Ｈｅ的组合方式、流量、喷嘴角度等对光致等离子体控制效果的影响。当内管通Ａｒ，外管通Ｈｅ且喷嘴角度大于４５°时可将等离子体完全抑制在蒸发沟槽之内，从而获得具有大的熔深和深宽比的焊缝。控制等离子体所需的Ｈｅ气流量与焊接速度有关，焊接速度增加，Ｈｅ气流量减小
A 2.5kW CO2 laser was used to weld stainless steel. A double nozzle consisting of two coaxial circular tubes was designed. The effects of Ar and He combination, flow rate, nozzle angle and so on on the control effect of photoplethysmography were studied. When the inner tube passes Ar and the outer tube passes He and the nozzle angle is greater than 45 °, the plasma can be completely restrained within the evaporation trench to obtain a weld with a large penetration depth and aspect ratio. The amount of He gas flow required to control the plasma is related to the welding speed, the welding speed increases, the He flow rate decreases