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Proceedings Paper

Influence of thermal deformation and shielding gas on topography of weld in deep-penetration laser welding
Author(s): Hongliang Qiang; Zhaogu Cheng; Jiangtao Luo; Gang Chen; Runwen Wang
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Paper Abstract

The thermal deformation in penetration welding with a laser has been investigated as a factor which results in the elevation on the surface of the weld. Qualitative analysis of the course of thermal deformation during which elevation is made has been presented in detail. A series of comparison laser welding experiments was done with a 5kW CO2 laser. The experimental results showed that there were always a slight warp and a lateral shrinking of the workpiece together with the elevation on the surface, which had been predicted by the analysis. The influence exerted by shielding gas on the topography of the weld has also been discussed. The shielding gas is supposed to affect the pressure above the surface of the welding pool. The shape of the surface of the welding pool is determined by the difference between pressures on both sides of the surface in term of Laplace equation. When the distribution of the gas pressure was homogeneous within the range of the welding pool, a fairly smooth topography was experimentally obtained. Otherwise, obvious ripples were observed along the weld.

Paper Details

Date Published: 30 September 1996
PDF: 7 pages
Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); doi: 10.1117/12.253135
Show Author Affiliations
Hongliang Qiang, Shanghai Institute of Optics and Fine Mechanics (China)
Zhaogu Cheng, Shanghai Institute of Optics and Fine Mechanics (China)
Jiangtao Luo, Shanghai Institute of Optics and Fine Mechanics (China)
Gang Chen, Shanghai Institute of Optics and Fine Mechanics (China)
Runwen Wang, Shanghai Institute of Optics and Fine Mechanics (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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