The dynamic characteristics of droplet transfer is extremely complicated with the combined effects of gravity force and weaving motion during the weaving vertical-up welding on thick plate. In this paper, we firstly observed the droplet transfer behavior under various weaving parameters with high-speed photography and electrical signals during pulsed gas metal arc welding (P-GMAW). Then we investigated the influences of different weaving parameters on the arc shape and molten pool as well as droplet characteristics. By establishing a novel weaving-force model based on static-force balance theory (SFBT), we further revealed the drop transfer mechanism in weaving P-GMAW process. Extensive experimental results demonstrated that the suitable weaving parameters could effectively improve the droplet transfer stability and suppress welding defects including incomplete root penetration and lack of sidewall fusion. The findings of this paper will provide a basis for enhancing the welding process stability and obtaining a high-quality weld joint.

中文翻译：

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编织参数对电弧编织P-GMAW工艺液滴转移动态特性及稳定性控制的影响

厚板编织立向上焊过程中，受重力和摆动运动的共同作用，熔滴传递的动态特性极其复杂。在本文中，我们首先通过高速摄影和电信号观察了脉冲气体保护金属电弧焊（P-GMAW）过程中各种编织参数下的熔滴转移行为。然后我们研究了不同编织参数对电弧形状和熔池以及熔滴特性的影响。通过建立基于静力平衡理论（SFBT）的新型织造力模型，我们进一步揭示了织造P-GMAW过程中的液滴转移机制。大量实验结果表明，合适的编织参数可以有效提高熔滴转移稳定性，抑制根部未熔透和侧壁未熔合等焊接缺陷。本文的研究结果将为提高焊接工艺稳定性和获得高质量的焊接接头提供依据。