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中文摘要：
为实现小电流CO2焊熔滴自由可控过渡，需对此条件下熔滴的受力状态和临界过渡尺寸及其影响因素进行研究．为此在主要考虑斑点电磁阻力、重力和表面张力的前提下，建立了基于SurfaceEvolver的CO2焊熔滴形态的数值模型，依据能量最小原理仿真获得了静力平衡状态下自由过渡熔滴的形态．进而重点研究了斑点电磁阻力对熔滴过渡临界尺寸的影响．结果表明，电流负脉冲可消除斑点阻力使熔滴由托起状态转为自然下垂，为下一步实现附加外力小电流的熔滴自由过渡提供了依据．
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