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焊接热过程经典理论不考虑熔滴过渡传入熔池的热量对熔池中流体流动及传热过程的影响,而将MIG与TIG焊接热过程的区别主要体现在电弧功率有效利用系数η的选取上。本文提出了一种处理MIG焊接热过程的新方法,这就是除了考虑电弧热流密度q(r)作用在工件表面上之外,还有熔滴过渡带入熔池的热量△H(r,z)作用在熔池内部,并考虑熔池中流体流动状态对热过程的影响。所建立的MIG传热模型首次从传热学和流体动力学的角度用数值方法模拟出了射流过渡时MIG焊缝的指状熔深。
The classical theory of welding thermal process does not consider the influence of the heat transferred by molten droplet transfer into the molten pool on fluid flow and heat transfer process. The difference between MIG and TIG welding thermal process is mainly reflected in the selection of arc power effective utilization factor η on. In this paper, we propose a new method to deal with the thermal process of MIG welding. In addition to considering the effect of arc heat flux q (r) acting on the surface of the workpiece, the amount of heat ΔH (r, z ) Acts inside the bath, taking into account the influence of fluid flow conditions in the bath on the thermal process. The MIG heat transfer model is established for the first time to simulate the finger penetration depth of MIG weld during jet transition from the view of heat transfer and fluid dynamics.