Challenges and opportunities in the arc welding of offshore steels

Gáspár, Marcell Gyula and Sisodia, Raghawendra Pratap Singh and Tervo, Henri and Javaheri, Vahid and Kaijalainen, Antti (2023) Challenges and opportunities in the arc welding of offshore steels. In: 76th IIW Annual Assembly and International Conference on Welding and Joining, 16-21 Júl 2023, Szingapúr.

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Abstract

Offshore steels are required not only good strength properties but also outstanding toughness at low temperatures to ensure the safety of the structures in an extremely cold environment. The new generations of offshore steels, in the range of S420-S500 range, exhibit remarkable toughness characteristics which must be preserved as much as possible during welding. However, welding processes, can significantly reduce the toughness properties due to the welding heat input. Furthermore, it is a challenge to guarantee the impact energy level in the dendritic, mostly multi-pass weld, is the same as that in the fine-grained and micro-alloyed steel plate, which is rolled through specific rolling processes, including thermomechanical controlled process (TMCP). The welding process and its’ parameters, as well as the filler material selection, play a significant role in the formation of an ideal weld and heat-affected zone (HAZ) microstructure with appropriate strength and toughness properties. The effect of microalloying elements on the formation of acicular ferrite (AF) in weld and HAZ has a determining role in terms of the toughness properties. This paper provides a detailed literature review of the characteristics, processing routes and weldability of advanced offshore steels. Gas Metal Arc Welding (GMAW) and Submerged Arc Welding (SAW) are the most frequently used technologies for offshore steels. The research results demonstrate that special attention is needed during the welding process, parameter and filler material selection to ensure the high impact safety of the welded joints under low temperatures.

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