Abstract
Purpose: This project aims to identify the correlation between the conditions, materials, structure, and properties of multi-pass stainless steel pipe connections made by manual arc welding.
Design/methodology/approach: This project includes the following multicenter study: The patterns of the multi-pass heat cycle effects on the structure and properties of the weld metal and weld-affected zone of the permanent 12Kh18N10T austenitic steel connection made by manual arc welding with the different coated electrode classes (MMA, Procedure 111) caused by a highly concentrated heat source are analyzed. Microhardness and internal stress distribution across the weld cross section and weld-affected zone, and changes in alloying elements between the layers are studied, and static tensile tests are performed.
Findings: A consistent pattern between welding conditions and weld corrosion resistance has been identified; it is shown that the coupons welded in gentle conditions (lower welding amperage) have the highest percentage of weight loss while speed-up conditions substantially reduce this indicator. Changes in alloying elements in different zones have been determined: between the beads, along the fusion line, and in the heat-affected zone in different welding conditions and when using different electrode classes.
Originality/value: The completed multicenter study is often unavailable to the covered welding electrode manufacturers that define the combination of the wire, coating, and base metal, and welding conditions by trial and error. The study gives a complete picture of the processes occurring in the weld metal and the weld-affected zone and facilitates a reasonable selection of welding consumables and welding conditions for multi-pass austenitic steel connections.
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Acknowledgments
The research project was performed at the Welding and Metallurgical Engineering Department of FGBOU VO Komsomolsk-on-Amur State University using the scientific equipment of the New Materials and Technology Resource Sharing Center and FEB RAS, Institute of Machine Science and Metallurgy.
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Bakhmatov, P.V., Mamadaliev, R.A., Kravchenko, A.S. (2021). Change in Weld Metal Structure and Properties for Multi-pass Butt Welding of Stainless Steel Process Piping. In: Shakirova, O.G., Bashkov, O.V., Khusainov, A.A. (eds) Current Problems and Ways of Industry Development: Equipment and Technologies. Lecture Notes in Networks and Systems, vol 200. Springer, Cham. https://doi.org/10.1007/978-3-030-69421-0_53
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DOI: https://doi.org/10.1007/978-3-030-69421-0_53
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