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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。
The welding of AZ31B magnesium alloy sheet was done by single-pass coupled arc melting inert gas arc welding (DE-GMAW), and the influence of the change of bypass current on the droplet transfer mechanism was investigated. Under different bypass currents, the pull of gravity and plasma flow promote the droplet transfer, and the surface tension hinders the droplet transfer. The electromagnetic force plays a decisive role in the droplet transfer. The larger the bypass current is, the larger the electromagnetic force is. The direction of force changes depends on the angle between the root of the arc θ, θ <70 ° Electromagnetic force impedes the droplet transition, θ> 70 ° Electromagnetic force to promote droplet transition.