Abstract
Purpose: The purpose of this study is to improve the quality of permanent stainless-steel connections produced by manual gas tungsten arc welding.
Design/methodology/approach: The impact of welding conditions was studied for the ranges of welding amperage and shielding gas (argon) consumption, and electrode grind angle recommended by the operating procedure (PI 1.4.75 - 2000). The quality of the completed welds was determined and evaluated by visual and radiographic inspection. Ferrite content in the weld metal was measured with a ferrite meter; mechanical properties were determined with the Instron universal testing machine and the Shimadzu microhardness tester for standard coupons; principal alloying element distribution across the cross section of the weld was identified with the Hitachi scanning electron microscope.
Findings: The study statistically analyzed defects in the tungsten inert gas welds (TIG, Procedure 141) of structural elements made of aviation light-gauge stainless steel. The TIG welding conditions were found to affect the risk of internal defects, structure, and mechanical properties of stainless steel welds. A linear regression model capturing a correlation between weld strength and the TIG welding conditions was generated. Recommendations for the fabrication of welded piping elements from aviation stainless steel were made.
Originality/value: Correlations between weld strength and the TIG welding conditions that can optimize process parameters were identified through experiments. Selection principles for welding conditions to develop structural fabrication processes for light-gauge stainless steel were recommended.
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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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Kravchenko, A.S., Bakhmatov, P.V. (2021). Removing Weld Defect Causes in Aviation Stainless Steel Piping Elements. 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_7
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DOI: https://doi.org/10.1007/978-3-030-69421-0_7
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