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Dissimilar gas tungsten arc weld-brazing of Al/steel using Al-Si filler metal: microstructure and strengthening mechanisms

Pouranvari, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2018.03.224
  3. Publisher: Elsevier Ltd , 2018
  4. Abstract:
  5. In this paper gas tungsten arc welding (GTAW) was applied to dissimilar lap joining of Al6061 and Zn-coated galvanized low carbon steels using Al-5 wt% Si filler metal. The joining mechanism was based on a hybrid brazing/welding mechanism. Three factors contributed to the joint strength including (i) low heat input rate of GTAW process which reduce the intermetallic compound layer growth during joining, (ii) the special role of Si in the filler metal which was able to change the nature of reaction layer from predominantly η-Al5Fe2 phase to predominately less brittle Al-Fe-Si phase and (iii) the flux-like action of Zn-coating which ensures complete wetting of steel surface by Al melt. It was found that there is a critical heat input which when exceeded caused degradation of the mechanical strength of the joint due to increased intermetallic compound growth. © 2018 Elsevier B.V
  6. Keywords:
  7. Intermetallic compound ; Zn-coating ; Aluminum ; Brazing ; Fillers ; Galvanized metal ; Gas metal arc welding ; Gas welding ; Intermetallics ; Joining ; Low carbon steel ; Silicon ; Soldering alloys ; Steel ; Tungsten ; Critical heat input ; Dissimilar welding ; Gas tungsten arc welding ; Gas tungsten arc welds ; Intermetallic compound growths ; Intermetallic compound layer growth ; Joining mechanisms ; Strengthening mechanisms ; Aluminum coatings
  8. Source: Journal of Alloys and Compounds ; Volume 749 , 15 June , 2018 , Pages 121-127 ; 09258388 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925838818310946