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  4. Prevention of liquid metal embrittlement cracks in resistance spot welds by adaption of electrode geometry
 
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2020
Journal Article
Title

Prevention of liquid metal embrittlement cracks in resistance spot welds by adaption of electrode geometry

Abstract
Advanced high strength steels are usually coated by a zinc layer for an increased resistance against corrosion. During the resistance spot welding of zinc coated steel grades, liquid metal embrittlement (LME) may occur. As a result, cracking inside and around the spot weld indentation is observable. The extent of LME cracks is influenced by a variety of different factors. In this study, the impact of the used electrode geometry is investigated over a stepwise varied weld time. A spot welding finite element simulation is used to analyse and explain the observed effects. Results show significant differences especially for highly increased weld times. Based on identical overall dimensions, electrode geometries with a larger working plane allow for longer weld times, while still preventing LME within the investigated material and maintaining accessibility.
Author(s)
Böhne, Christoph
Meschut, Gerson
Biegler, Max  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Frei, Julian
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Rethmeier, Michael  
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Journal
Science and technology of welding and joining  
DOI
10.1080/13621718.2019.1693731
Language
English
Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK  
Keyword(s)
  • liquid metal embrittlement

  • advanced high strength steels

  • resistance spot welding

  • electrode geometry

  • weld time

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