AZ91镁合金的YAG脉冲激光焊接

为了研究AZ91镁合金的焊接性,采用YAG脉冲激光焊单面焊双面成型的工艺对厚1.5mm的AZ91变形镁合金进行了焊接试验研究,由试验研究结果可知,焊缝中的组织主要是细小的等轴晶区,熔合线清晰,无明显的热影响区,缺陷较少,焊缝的晶粒尺寸明显小于母材;由于Mg的蒸发,最终导致了焊缝区Al和Zn含量的相对增加,使得焊缝的显微硬度都高于母材。结果表明,采用合理的工艺措施,AZ91镁合金具有良好的YAG脉冲激光焊接性。

YAG pulsed laser welding for AZ91 magnesium alloy

In order to study the weldability of magnesium alloy AZ91,1.5mm thick AZ91 magnesium alloy was welded with YAG pulsed laser through the art and craft of one side welding with back formation.Analysis showed that the organization of the joint were mainly fine equiaxed grains,with clear fusion line,no significant heat-affected zone and fewer defects.The grain size of the joints was significantly smaller than the base material's.And because of a large number of Mg evaporation which eventually leads to a corresponding increase of Al and Zn in the welding zone,the micro-hardness of the joint was higher than that of the base material.The results show that AZ91 magnesium alloy has good weldability for YAG pulsed laser based on reasonable technological measures.