采用CO_2激光焊接方法对10 mm厚的AZ31镁合金进行焊接.利用光学显微镜、扫描电镜、X射线衍射仪等手段分析焊接接头的宏观形貌、显微组织、元素分布和焊缝物相等.结果表明:焊缝正面凹陷,背部成形较好;焊缝组织为细小的等轴晶粒,物相主要为Mg,未出现Al-Mg低熔点相;接头强度均值为212MPa,在断口处存在大量的气孔.
The 10 mm thick AZ31 magnesium alloy was welded by the laser welding. The macro-morphology, microstructure, element distribution and phases of welded joint were analyzed by means of OM, SEM, and XRD, etc. The results show that the front side of weld is depressed and the shape of back side is welL The microstructure of magnesium alloy weld is fine equiaxed grains. Phase in the weld is mainly Mg, and Al-Mg low melting point phase does not exist The average strength of the welded joint is 212 MPa, and there are some pores on the fracture surface.
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