Abstract In this work, a new lateral ultrasonic-assisted droplet transfer controlling method was innovatively developed in the underwater wet welding process. The ultrasonic acoustic streaming can overcome the resistance caused by arc bubble rising, promote the metal transfer and reduce the proportion of droplet repelled spatter from 9% to 5%. The proportion of unstable droplet transfer mode decreased from 64% to 41%, which obtain a welded joint that was smooth and free of defects. The proportion of pro-eutectoid ferrite was decreased while the weld metal presented a finer microstructure. As a feasible and high-efficiency method, it is expected to spread the application of underwater wet welding in ocean and coastal engineering.

中文翻译：

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一种利用超声波辅助方法控制水下湿焊中金属转移的新策略

摘要 在这项工作中，在水下湿焊过程中创新地开发了一种新的横向超声波辅助液滴转移控制方法。超声波声流可以克服电弧气泡上升引起的阻力，促进金属转移，将液滴排斥飞溅的比例从9%降低到5%。不稳定熔滴转移模式的比例从64%下降到41%，获得了光滑无缺陷的焊接接头。先共析铁素体的比例降低，而焊缝金属呈现出更精细的显微组织。水下湿焊​​作为一种可行且高效的方法，有望在海洋和海岸工程中推广应用。