中文摘要：

通过单旁路耦合电弧熔化极惰性气体保护焊（DE-GMAW）对AZ31B镁合金薄板进行堆焊试验,探讨旁路电流大小的改变对整个熔滴过渡机制的影响。在不同的旁路电流下,重力和等离子流拉力促进熔滴过渡,表面张力阻碍熔滴过渡;电磁力在整个熔滴过渡过程中起决定性作用,旁路电流越大,电磁力越大,电磁力的方向改变取决于电弧根部夹角θ,θ〈70°电磁力阻碍熔滴过渡,θ〉70°电磁力促进熔滴过渡。

英文摘要：

By single bypass coupling arc inert gas welding（DE-GMAW） for AZ31 B alloy plate, including the stress analysis of the droplet transfer model, the influence of bypass current on the droplet transfer mechanism was studied. Under different bypass current, the force of plasma flow and gravity promote the droplet transfer; on the contrary, the surface tension hinders the droplet transfer; the electromagnetic force plays a decisive role in the whole process of droplet transfer, with the bypass current increasing, the electromagnetic force is greater, the change of the direction of the electromagnetic force depends on the arc root angle, when the θ70° electromagnetic force hinders the droplet transfer, θ70° electromagnetic force can promote the droplet transfer.