Indian Journal of Science and Technology

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Objectives: This study aims to investigate the mechanical properties and phase transformations in dissimilar metal joints between AISI 301 Austenitic Stainless Steel and AISI 409M Ferritic Stainless Steel, joined by resistance spot welding. Methods/Analysis: Mechanical properties such as tensile shear strength, failure energy, failure mode, nugget size and surface indentation were analysed at varying current ratings. Macrostructure was examined for size and shape. Microstructure at various locations such as, fusion zone and heat affected zones were investigated. Micro hardness measurement was done at various locations along the weld. Findings: Peak load incremented progressively with rise in welding current, till the commencement of severe expulsion. Weld zone hardness showed a higher value than that of nearby heat affected zones and parent metals. Increment in welding current resulted in enlargement of weld nugget and rise in energy absorption capacity. Electrode indentation values were seen to be correlated with welding current values positively. Fusion zone microstructure consists of marten site and ferrite. Asymmetrical nugget shape was observed. Novelty/Improvement: This study explores the properties, both mechanical and microstructure of AISI 409M-AISI 301 steel dissimilar joint, joined by resistance spot welding.

Keywords

AISI301, AISI409M, Failure mode, Microstructure, Peak load.
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