ABSTRACT

Welded Joints long-term integrity is of particular importance to large vessels, such as frigates or bulk carriers. Downtime due to corrosion concerns can be onerous. Ship classification organisations, such as The American Bureau of Shipping (ABS), standardises processes and product approval programmes for materials manufacturers. High-strength steels are of particular interest due to their high strength to cost ratio for large marine vessel construction. The corrosion performance of such steels has been studied, but data on the specific degradation of such metals when welded and for the welds themselves are scarce. The present paper reports marine immersion corrosion pit depth data for several ABS steel grade weld permutations and exposed to different sites for up to 2.5 years. The implications of the presented results are discussed as well as the possible influence of alloying elements and microstructural differences on the underlying corrosion kinetics.

摘要

焊接接头的长期完整性对于大型船舶尤其重要，例如护卫舰或散货船。由于腐蚀问题导致的停机时间可能很繁重。船舶分类组织，例如美国船级社 (ABS)，为材料制造商制定流程和产品批准程序标准化。高强度钢因其在大型船舶建造中的高强度成本比而受到特别关注。已经研究了这种钢的腐蚀性能，但是关于这种金属在焊接时和焊缝本身的具体退化的数据很少。本论文报告了几种 ABS 钢级焊接排列的海洋浸没腐蚀坑深度数据，并在不同地点暴露长达 2.5 年。