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30 September 1996 Influence of gas jet on weld formation during CO2 laser penetration welding
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A nozzle which consist of two co-axial pipes was applied to weld stainless steel with a 2.5kw CO2 laser. Helium through the outer pipe and argon through the inner one were used as the shielding and plasma controlling gases. The influences of the gas flow rate, the angle of nozzle and the gas jet position relative to the laser beam on the weld depth, the ratio of the weld depth to width and the weld formation were studied. When the argon flow rate is 10 1/min with the nozzle angle greater than 45 degrees, the plasma can be suppressed in the keyhole, and then a weld with great penetration and ratio of weld depth to width can be obtained. At a certain welding speed, there is an optimal helium flow rate to get the deepest weld. The optimal helium flow rate corresponding to the deepest weld decreases with the increase of the welding speed. However, improper gas jet position will destroy the keyhole and cause bad weld formation.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rongshi Xiao, Hanhua Mei, and Tiechuan Zuo "Influence of gas jet on weld formation during CO2 laser penetration welding", Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996);


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