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Welding metallurgy of dissimilar AISI 430/DQSK steels resistance spot welds

Pouranvari, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. Publisher: American Welding Society , 2015
  3. Abstract:
  4. This paper addresses the microstructure and mechanical performance of dissimilar resistance spot welds between AISI 430 ferritic stainless steel and drawing quality special killed (DQSK) low-carbon steel. The mechanical properties of the welds are described by peak load, failure energy, and failure mode during the tensile-shear test. Phase transformations in the fusion zone (FZ) and heat-affected zone (HAZ) are analyzed. The main metallurgical features of the weldment are the formation of a dual-phase, ferrite-martensite microstructure in the FZ, grain growth and martensite formation in the HAZ of the ferritic stainless steel side, and martensitic and eutectoid transformations in the HAZ of the DQSK steel side. It was observed that increasing welding current leads to transition of failure mode from interfacial to double pullout mode. It is shown that the FZ size at sheet/sheet interface in the DQSK side is the key macrostructural feature controlling the load bearing capacity and energy absorption capability of the AISI 430/DQSK dissimilar weld
  5. Keywords:
  6. Failure mode ; Carbon ; Failure modes ; Ferrite ; Ferritic steel ; Grain growth ; Heat affected zone ; Low carbon steel ; Martensite ; Martensitic stainless steel ; Martensitic steel ; Martensitic transformations ; Metal drawing ; Metallurgy ; Microstructure ; Resistance welding ; Spot welding ; Steel metallurgy ; Welding ; Welds ; AISI 430 ferritic stainless steels ; Dissimilar welding ; Energy absorption capability ; Eutectoid transformation ; Ferritic stainless steel ; Mechanical performance ; Resistance spot welding ; Welding metallurgy ; Stainless steel
  7. Source: Welding Journal ; Volume 94, Issue 6 , 2015 , Pages 203s-210s ; 00432296 (ISSN)
  8. URL: https://app.aws.org/wj/supplement/WJ_2015_06_s203.pdf