Abstract In order to explore the influence of different welding heat inputs on the dilution rate and corrosion performance of marine steel welds, this study conducts a comparative analysis of weld formation, weld dilution rate, microstructure, composition distribution, hardness, and corrosion performance characteristics, and influencing mechanisms in the cases of different heat inputs through comparative study. The results show that the dilution rate of single-wire GMAW increases as heat input rises, while the dilution rate of CWW GMAW remains relatively stable. The composition peak distribution of both welding methods decreases as welding heat input increases. Additionally, the peak height of CWW GMAW is lower than that of single-wire GMAW due to the higher heat input in CWW GMAW. The hardness of both welding methods decreases as welding heat input rises, while the maximum hardness of CWW GMAW is lower than that of single-wire GMAW. The corrosion resistance of the joints obtained by two welding methods decreases with the increase of heat input, while the corrosion resistance of CWW GMAW welded joint is lower than those of the joints produced by single-wire GMAW employing different heat inputs.
Yang et al. (Thu,) studied this question.