8 April 1996 Laser welding of Zn-coated sheet steels
Author Affiliations +
Compared to other welding processes, laser welding of sheet steels coated with various zinc- rich layers (galvanized, electrogalvanized, galvannealed, etc.) can permit weight reduction of automobiles plus increase in productivity. Some instances of laser welding of such coated steels have been reported. However, wider applications of lasers for this purpose are hampered by the low boiling temperature of zinc compared to the melting temperature of steel. During laser welding in the lap-joint configuration, the presence of vaporized zinc between the steel sheets often leads to expulsion of the weld metal or considerably weld porosity. Attempts to overcome this problem using Nd:YAG laser welding are reviewed. For the lap-joint configuration, techniques examined include provision of a gap between the sheets, use of geometrical solutions such as concave or convex surfaces, and pulsing or modulating the laser waveform. The effects on weld quality of power density, pulse time and pulse shaping (for pulsed welding), the coating type and weight, the location of the beam axis and beam focus with respect to the sheet surface(s) and the joint geometry (lap and edge) have been examined. The results provide insight into the weldability of coated sheet steels by the laser welding process as well as better assessment of viable approaches to this problem.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marianne P. Graham, Marianne P. Graham, Hugh W. Kerr, Hugh W. Kerr, David C. Weckman, David C. Weckman, } "Laser welding of Zn-coated sheet steels", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); doi: 10.1117/12.237726; https://doi.org/10.1117/12.237726


SHADOW a new welding technique: basics and applications
Proceedings of SPIE (October 07 2004)
Out of the SHADOW watch parts in the spotlight...
Proceedings of SPIE (October 16 2003)
Nd:YAG laser welding: an overview
Proceedings of SPIE (April 08 2003)
High-speed single-pulse welding with Nd:YAG lasers
Proceedings of SPIE (April 11 2005)
Fine micro welding of thin metal sheet by high speed...
Proceedings of SPIE (June 11 2007)
Thick-plate welding with Nd:YAG laser and COIL
Proceedings of SPIE (March 02 2003)

Back to Top