Abstract
Prevention of solidification cracking is a major concern in pulsed laser welding of aluminium-magnesium alloys. Laser parameters can affect both Mg evaporation and the solidification rate. In this study the interactive effects of Mg evaporation and solidification rate on solidification cracking susceptibility (SCS) as a function of pulsed laser parameters in welding of aluminium-magnesium alloys was investigated. The results of calculations were verified by experimental measurements. It is shown that due to the rapid solidification of Al-Mg alloys during laser welding, SCS increases and the maximum cracking susceptibility is shifted to higher concentrations. Hence, the range of composition susceptible to solidification cracking is increased as the rate of solidification is increased. The calculations show that when the overlapping factor was increased, SCS decreases due to the reduction of solidification rate. On the other hand, due to successive evaporations, the Mg content of the final weld metal decreases, and that increased SCS. However, interactive analysis of SCS shows that the effect of decrease in solidification rate is more pronounced than the effect of the decrease in the Mg content on SCS.
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