Abstract Separate control of heat input and metal transfer is an essential way to resolve the contradiction between low heat input and stable metal transfer in GMAW, to meet the possible requirement from different welding tasks, e.g., the thin plate welding. To this end, the resonance of the pendant droplet excited by mechanical means is utilized to achieve current-independent metal transfer at any reasonably low current that can sustain the arc. The natural frequency of the pendant droplet decreases with the rise of the droplet size. When the natural frequency declines to close to the excitation frequency with the droplet growth, resonance occurs, and the oscillation amplitude of the droplet increases significantly. In the resonant region, the downward inertial force resulting from the downward moving droplet induces the drop detachment in advance, resulting in much faster metal transfer and smaller detached drop diameter compared with conventional GMAW with the same welding parameters. The improved metal transfer process leads to an enhancement of the continuity and uniformity of the bead formation.

中文翻译：

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在气体保护金属电弧焊中利用熔滴共振实现与电流无关的金属转移

摘要 热输入和金属转移的分离控制是解决GMAW中低热输入和稳定金属转移之间矛盾的重要途径，以满足不同焊接任务的可能要求，例如薄板焊接。为此，通过机械方式激发的悬垂液滴的共振被用来在任何可以维持电弧的合理低电流下实现与电流无关的金属转移。悬垂液滴的固有频率随着液滴尺寸的增加而降低。当固有频率随着液滴的生长而下降到接近激发频率时，发生共振，液滴的振荡幅度显着增加。在谐振区，与焊接参数相同的传统 GMAW 相比，向下移动的熔滴产生的向下惯性力提前引起熔滴脱离，从而导致金属转移速度更快，分离的熔滴直径更小。改进的金属转移过程导致焊道形成的连续性和均匀性的增强。