中文摘要：

实验与镁合金的绕过当前的米格式飞机 weldingbrazing 被执行到电镀的钢在微观结构和臀部关节的机械性质上调查热输入的效果。试验性的结果显示联合效率趋于起初增加然后随热输入的增加减少。当热输入是 155 时，联合效率到达了它大约 70% 的最大值 ? J/mm。在镁合金和钢之间的冶金的结合是薄连续反应层，并且金属间化合的复合的层由 MgZn 和细微 FeAl 阶段组成了。绕过当前的米格式飞机 weldingbrazing 是一个稳定的焊接过程，这被结束，它能被用来完成与好焊接外观的到钢的镁合金的没有缺点的加入。

英文摘要：

Experiments were carried out with bypass-current MIG welding–brazing of magnesium alloy to galvanized steel to investigate the effect of heat input on the microstructure and mechanical properties of lap joints. Experimental results indicated that the joint efficiency tended to increase at first and then to reduce with the increase of heat input. The joint efficiency reached its maximum of about 70% when the heat input was 155 J/mm. The metallurgical bonding between magnesium alloy and steel was a thin continuous reaction layer, and the intermetallic compound layer consisted of Mg–Zn and slight Fe–Al phases. It is concluded that bypass-current MIG welding–brazing is a stable welding process, which can be used to achieve defect-free joining of magnesium alloy to steel with good weld appearances.