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Proceedings Paper

Influence of gas jet on weld formation during CO2 laser penetration welding
Author(s): Rongshi Xiao; Hanhua Mei; Tiechuan Zuo
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Paper Abstract

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.

Paper Details

Date Published: 30 September 1996
PDF: 7 pages
Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); doi: 10.1117/12.253143
Show Author Affiliations
Rongshi Xiao, Beijing Polytechnic Univ. (China)
Hanhua Mei, Beijing Polytechnic Univ. (China)
Tiechuan Zuo, Beijing Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 2888:
Laser Processing of Materials and Industrial Applications
Shu-Sen Deng; S. C. Wang, Editor(s)

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