EFFECT OF ZINC COATING THICKNESS IN GAP-FREE LASER WELDING OF GALVANIZED SHEET STEELS
Laser beam welding is used for joining zinc coated steel in the automotive industry. However, overlap laser welding of these steels remains difficult because of the low boiling temperature of the zinc compared with the melting temperature of the steel. It has been shown in some recent research that overlap welds are feasible without deliberately introducing a gap between the sheets before welding. In this paper results of overlap welding performed on coated steel with different zinc coating thickness are presented, which, contrary to expectations, suggest that steels with a thicker zinc coating have more stable laser welding process behaviour. A transient gap between the two sheets due to thermal deformation, coupled with the motion of liquid zinc around the weld, are put forward to explain the phenomena observed. It is also shown that the clamping system has a nonnegligible influence on the root face weld quality, dependent on the volume of the efflux channel.
Y. Pan I. M. Richardson
Netherlands Institute for Metal Research, Delft, Netherlands Netherlands Institute for Metal Research, Delft, Netherlands Delft University of Technology, Delft,
国际会议
第三届太平洋国际激光与光学应用会议(PICALO 2008)
北京
英文
185-190
2008-04-16（万方平台首次上网日期，不代表论文的发表时间）