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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Mechanical properties of duplex steel welded joints in large-size constructions

Nowacki J., Zając P.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 54, nr 1

39--48

Purpose: On the basis of sources and own experiments, the analysis of mechanical properties, applications as well as material and technological problems of ferritic-austenitic steel welding were carried out. It was shown the area of welding applications, particularly welding of large-size structures, on the basis of example of the FCAW method of welding of the UNS S3 1803 duplex steel in construction of chemical cargo ships. Design/methodology/approach: Welding tests were carried out for duplex UNS S31803 steel plates, 9.5, 14.5 and 18.5 mm thick, with flux-cored wire The effect of welding with increased threshold space on mechanical properties of welded joints was determined when compared to those obtained in result of welding with 6 mm threshold space as well as to recommendations of DNV regulations and rules Findings: It was shown that widening of threshold space tolerance and wide-gap welding of duplex steel is possible, i.e. completion of welded joints by one-side vertical bottom-top welding (PF) with no need for applying the process of edge pad welding in case of weld groove geometry with the threshold space ranging 6 to 10 mm, from the point of view of meeting requirements with respect to mechanical properties by welded joints Research limitations/implications: The welding heat input exceeding the recommended values might influence the precipitation processes in the HAZ, what need further experiments. Practical implications: Application of high value of the welding heat input will be profitable in terms of the welding costs. Originality/value: An original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.