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

doi:10.1117/12.253135

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 +

Proceedings Volume 2888, Laser Processing of Materials and Industrial Applications; (1996) https://doi.org/10.1117/12.253135
Event: Photonics China '96, 1996, Beijing, China

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available