论文部分内容阅读
以0.3 mm厚的H62黄铜片为中间层,采用TIG焊的方法对AZ31B镁合金和304不锈钢板材进行搭接熔钎焊,观察分析了熔钎焊接头的宏观形貌及显微组织,测定了元素分布及力学性能。结果表明,在交流电流70 A、焊接速度100 mm/min的条件下,实现了镁合金和不锈钢的TIG熔钎焊。接头由焊缝区、钎缝区和熔合区三部分组成,钎缝区不锈钢一侧发生了不规则溶解,钎缝区显微组织由α-Fe、α-Mg及沿α-Mg晶界分布的少量的Mg-Cu-Al共晶体组成。熔钎焊接头的拉伸断裂发生在焊缝区,抗拉强度达到130 MPa。钎缝区钢一侧形成的不规则嵌入式组织结构明显提高了不锈钢与镁合金的界面的结合强度。
A 0.3 mm thick H62 brass sheet was used as the intermediate layer. TIG welding was used to lap-weld the AZ31B magnesium alloy and the 304 stainless steel sheet. The macroscopic morphology and microstructure of the solder joint were observed and analyzed. The element distribution and mechanical properties. The results show that TIG brazing of magnesium alloy and stainless steel is realized under the condition of alternating current 70 A and welding speed 100 mm / min. The joint consists of three parts: weld zone, brazing seam zone and fusion zone. The stainless steel side of the brazing seam zone is irregularly dissolved. The microstructure of the brazing seam zone is distributed by α-Fe, α-Mg and along the α-Mg grain boundary Of a small amount of Mg-Cu-Al eutectic composition. Tensile fracture of fusion brazed joints occurs in the weld zone with a tensile strength of 130 MPa. The irregular embedded structure formed on one side of the brazed seam steel significantly improves the bonding strength of the interface between the stainless steel and the magnesium alloy.