Abstract
From many years, the high strength low alloy steels are often used for offshore constructions. This constructions, due to the environment in which they work, require more frequent repairs than the constructions from the land. For economic reasons, repairs take place in the underwater conditions, however water significantly decreases the weldability of steel. The paper presents the results of the CTS weldability test for S460ML and S460 steels, which have a similar value of the yield point, but different carbon equivalent (CeMIS) values. The welded joints were cut into specimens, which were then subjected to Vickers HV10 hardness measurements. The experiment has shown that as the CeMIS value increases, the hardness in the heat affected zone (HAZ) of joints and in the weld metal increases.
Highlights
This constructions, due to the environment in which they work, require more frequent repairs than the constructions from the land
The most common method for this process is the variation of underwater welding with covered electrodes, during which the resulting joint, welding arc and diver are not separated from the surrounding environment [5÷8]
In each of the selected sample pairs, significantly higher hardness values in heat affected zone (HAZ) were noted for samples made of S460N steel characterized by a higher value of carbon equivalent
Summary
The study used fine-grained steels with increased durability of S460ML and S460N with a thickness of 12 mm. The selection of these two steels was determined by the fact that they have a similar value of the yield point at different CeMIS values. The chemical composition was analyzed by emission spectroscopy with spark excitation, and the test results are presented in table I. The selection of electrodes was determined by the fact that they had to provide good metal properties of the weld metal and, in addition, should maintain the stability of the electric arc. The chemical composition and mechanical properties of the additive material are shown in table III
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
