Study correlating the bubble phenomenon and electrical signals in underwater wet welding with covered electrodes

Oliveira, Frederico de Rosa; Soares, William Rodrigues; Bracarense, Alexandre Queiróz

doi:10.1080/09507116.2014.932980

Cited by 13 publications

(1 citation statement)

References 3 publications

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“…The arc stability is affected by the dynamics of bubble formation and detachment [4]. When the bubble breaks or leaves the welding area, the arc extinguishes, which deteriorates the stability of the welding process [5]. In addition, since the thermal conductivity of water is much higher than that of air, the cooling rate of an underwater joint is much faster than that in air.…”

Section: Introductionmentioning

confidence: 99%

Process Stability, Microstructure and Mechanical Properties of Underwater Submerged-Arc Welded Steel

Zhang

Han

Jia

et al. 2021

Metals

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In underwater wet welding, the unstable welding process caused by the generation and rupture of bubbles and the chilling effect of water on the welding area result in low quality of welded joints, which makes it difficult to meet the practical application of marine engineering. To improve the process stability and joining quality, a mixture of welding flux with a water glass or epoxy resin was placed on the welding zone before underwater welding. In this paper, welds’ appearance, geometry statistics of welds’ formation, welding process stability, slag structure, microstructure, pores and mechanical properties were investigated. It was found that with the addition of water glass in the mixture, the penetration of weld was effectively increased, and the frequency of arc extinction was reduced. Though the porosity rose to a relatively high level, the joints’ comprehensive mechanical properties were not significantly improved. Notably, the applied epoxy resin completely isolated the surrounding water from the welding area, which greatly improved process stability. Furthermore, it benefited from the microstructure filled with massive acicular ferrite, the average elongation and room temperature impact toughness increased by 178.4%, and 69.1% compared with underwater wet welding, respectively, and the bending angle of the joint reaches to 180°.

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Section: Introductionmentioning

confidence: 99%