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以AZ31镁合金与Q235镀锌钢板为研究对象,进行旁路分流MIG电弧熔钎焊接工艺试验,在获得稳定可靠的焊接过程和美观的焊缝成形的同时,实现了镁/钢异种金属的可靠连接.同时采用金相显微镜,高速摄像机和拉伸试验机对焊接接头的组织、熔滴过渡过程以及力学性能进行观察与分析.结果表明,焊接过程中熔滴的排斥过渡增加了熔滴过渡的时间,使得熔滴润湿铺展更为均匀,且保证了界面层元素的充分结合.拉伸试验表明,焊接接头的抗拉强度达133 MPa,约为母材强度的70%,接头断裂发生在镁合金焊缝处,呈韧性断裂的形貌特征.
Taking AZ31 magnesium alloy and Q235 galvanized steel as the research object, the bypass shunt MIG arc brazing welding process test was carried out. In addition to the stable and reliable welding process and the beautiful weld formation, the magnesium / steel dissimilar metal Reliable connection.Microscopic microscope, high-speed camera and tensile testing machine were used to observe and analyze the microstructure, transfer process and mechanical properties of the welded joints.The results showed that the droplet transfer during the welding process increased the droplet transfer Of the time, making the drop spread wetting more uniform, and to ensure the full integration of the interface layer elements Tensile test showed that the tensile strength of welded joints up to 133 MPa, about 70% of the strength of the base material, joint fracture occurs In the magnesium alloy weld at the appearance of toughness fracture characteristics.