Paper
30 September 1996 Influence of thermal deformation and shielding gas on topography of weld in deep-penetration laser welding
Hongliang Qiang, Zhaogu Cheng, Jiangtao Luo, Gang Chen, Runwen Wang
Author Affiliations +
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hongliang Qiang, Zhaogu Cheng, Jiangtao Luo, Gang Chen, and Runwen Wang "Influence of thermal deformation and shielding gas on topography of weld in deep-penetration laser welding", Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); https://doi.org/10.1117/12.253135
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Cited by 2 scholarly publications.
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KEYWORDS
Laser welding

Laser processing

Gas lasers

Carbon monoxide

High power lasers

Liquids

Metals

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