Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Abstract

Water as the welding environment determines some essential problems influencing steel weldability. Underwater welding of high strength steel joints causes increase susceptibility to cold cracking, which is an effect of much faster heat transfer from the weld area and presence of diffusible hydrogen causing increased metal fragility. The paper evaluates the susceptibility to cold cracking of the high strength S355G10+N steel used, among others, for ocean engineering and hydrotechnical structures, which require underwater welding. It has been found from the CTS test results that the investigated steel is susceptible to cold cracking in the wet welding process.

Cold Cracking of S460N Steel Welded in Water Environment

“…The developing offshore industry demands to make the repairs in water environment , without disassembling the elements and moving them into air [1,2]. The most widely used repair method is wet welding which, for economic reasons, is carried out generally with covered electrodes [3,4]. However in wet welding FCAW method is also common used [5].…”

“…For structural elements working under water high strength steels are more and more widely used. Weldability of these steels in the air is a well investigated issue but transferring the process into water environment still produces many problems [3,4]. The joints made by using wet method show presence of welding imperfections such as gas porosity, shape failures and cracks [8,9].…”

Badania spawalności stali S460N w środowisku wodnym z wykorzystaniem próby Tekken

“…Wywołane są one równoczesnym oddziaływaniem następujących czynników [1,4,6,14,18,19]: -kruchej mikrostruktury w SWC; -wysokich naprężeń w obszarze o niekorzystnej mikrostrukturze; -obecności wodoru dyfundującego.…”

The effect of shot peening on the corrosion behaviour of Ti-6Al-4V alloy made by DMLS

“…Whereas, in accordance with the authors' own research and source literature [2], as a result of shot peening process, shot grains can penetrate into subsurface layer (depositing permanently) and change the corrosion resistance of modified products. Therefore, all experimental studies associated with assessment of the technical condition of products contribute to the improvement of their durability [11,12].…”