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  4. Influence of electron beam welding parameters on the weld seam geometry of Inconel 718 at low feed rates
 
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2020
Journal Article
Title

Influence of electron beam welding parameters on the weld seam geometry of Inconel 718 at low feed rates

Other Title
Einfluss der Prozessparameter auf die Nahtgeometrie beim Elektronenstrahlschweißen von Inconel 718 bei reduzierten Vorschubgeschwindigkeiten
Abstract
Ni-based superalloys are well established in various industrial applications, because of their excellent mechanical properties and corrosion resistance at high temperatures. Despite the high development stage and a common industrial use of these alloys, hot cracking remains a major challenge limiting the weldability of the materials. As commonly known, the hot cracking susceptibility during welding increases with the amount of precipitation phases. Hence, a large amount of highstrength Ni-Alloys is rated as non-weldable. A new approach based on electron beam welding at low feed rates shows great potential for reducing the hot cracking tendency of precipitation-hardened alloys. However, geometry and properties of the weld seam differ significantly in comparison to the common process range for practical uses. The aim of this study is to investigate the influence of welding parameters on the seam geometry at low feed rates between 1 mm/s and 10 mm/s. For this purpose, 25 bead on plate welds on a 12 mm thick sheet made of Inconel 718 are carried out. First, the relevant parameters are identified by performing a screening. Then the effects discovered are further studied by using a central composite design. The results show a significant difference between the analyzed weld seam geometry in comparison to the well-known appearance of electron beam welded seams.
Author(s)
Raute, Julius
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Jokisch, Torsten
Marko, Angelina
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Biegler, Max  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Rethmeier, Michael  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Journal
MP materials testing  
DOI
10.3139/120.111614
Language
English
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Keyword(s)
  • electron beam welding

  • Ni-based superalloy

  • Inconel 718

  • low feed rates

  • seam geometry

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