CO_2激光深熔焊接光致等离子体控制的研究  

Study of the Control of Laser Induced Plasma during CO 2 Laser Penetration Welding

作　　者：肖荣诗[1] 左铁钏[1] 

机构地区：[1]北京工业大学应用激光所国家产学研激光技术中心

出　　处：《中国激光》1997年第5期461-466,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金

摘　　要：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。A nozzle which consists of two co axis pipes was designed to weld stainless steel with a 2.5 kW CO 2 laser. The influences of the supplying way and flow of argon and helium, and of the angle of nozzle on the control of laser induced plasma were studied. When the angle of the nozzle to the workpiece is greater than 45° with helium flowing through the outer pipe and argon through the inner one, the laser induced plasma is completely suppressed in the keyhole, and then a weld is obtained of great weld depth and great ratio of depth to width. The required flow of helium to control the plasma decreases with the increase of welding speed.

关 键 词：激光深熔焊接 喷嘴 等离子体 焊缝成型 

分 类 号：TG456.7[金属学及工艺—焊接]