Abstract Underwater welding technology has become indispensable to the construction, maintenance, and repair of many offshore structures in oceanographic engineering industry. However, the existing disadvantages of current underwater welding technologies make them be unpopular and limited. An innovative organic adhesive assisted underwater submerge-arc welding was proposed to avoid the water disturbances to the maximum extent in wet condition. The mixture composed of bisphenol-A epoxy resin (EP) and welding flux in a weight ratio of 4:6 was placed on the metal surface before welding. Welding arc totally submerged in the mixture and maintained stable burning between the wire and base metal. The coverage effectively isolated the serious direct disturbances from surrounding water and greatly reduced the cooling rate of the welded joints to 19.57 °C/s. High-performance and defect-free welded joints were achieved with fine microstructures. The average tensile strength and maximum bending angle of the welded joints obtained by underwater submerged arc welding reached 463 MPA and 180°, respectively. Especially, low temperature impact toughness still keep 63 J/cm2 in 0 °C, which means far better mechanical properties compared with underwater wet welding. For the wet condition, this provides a possibility to acquire high-quality underwater welded joints comparable to that in air.

中文翻译：

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有机粘合剂辅助水下埋弧焊

摘要 水下焊接技术已成为海洋工程行业众多海上结构物的建造、维护和修理中不可或缺的技术。然而，目前水下焊接技术存在的缺点使它们不受欢迎和受到限制。提出了一种创新的有机粘合剂辅助水下埋弧焊，以最大限度地避免潮湿条件下的水扰动。将双酚A型环氧树脂（EP）与焊剂按重量比4:6组成的混合物在焊接前置于金属表面。焊接电弧完全浸没在混合物中，并在焊丝和母材之间保持稳定的燃烧。覆盖层有效地隔离了来自周围水体的严重直接扰动，并大大降低了焊接接头的冷却速度至 19.57°C/s。通过精细的微观结构实现了高性能和无缺陷的焊接接头。水下埋弧焊获得的焊接接头的平均抗拉强度和最大弯曲角分别达到463 MPA和180°。特别是低温冲击韧性在0°C下仍保持63 J/cm2，这意味着与水下湿焊相比，机械性能要好得多。对于潮湿条件，这提供了获得与空气中相当的高质量水下焊接接头的可能性。这意味着与水下湿焊相比，机械性能要好得多。对于潮湿条件，这提供了获得与空气中相当的高质量水下焊接接头的可能性。这意味着与水下湿焊相比，机械性能要好得多。对于潮湿条件，这提供了获得与空气中相当的高质量水下焊接接头的可能性。