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  4. The Influence of Electrode Indentation Rate on LME Formation during RSW
 
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2022
Journal Article
Titel

The Influence of Electrode Indentation Rate on LME Formation during RSW

Titel Supplements
This paper investigates the liquid metal embrittlement cracking tendency in third-generation advanced high-strength steels during resistance spot welding
Abstract
During resistance spot welding of zinc-coated advanced high-strength steels (AHSSs) for automotive production, liquid metal embrittlement (LME) cracking may occur in the event of a combination of various unfavorable influences. In this study, the interactions of different welding current levels and weld times on the tendency for LME cracking in third-generation AHSSs were investigated. LME manifested itself as highpenetration cracks around the circumference of the spot welds for welding currents closely below the expulsion limit. At the same time, the observed tendency for LME cracking showed no direct correlation with the overall heat input of the investigated welding processes. To identify a reliable indicator of the tendency for LME cracking, the local strain rate at the origin of the observed cracks was analyzed over the course of the welding process via finite element simulation. While the local strain rate showed a good correlation with the process-specific LME cracking tendency, it was difficult to interpret due to its discontinuous course. Therefore, based on the experimental measurement of electrode displacement during welding, electrode indentation velocity was proposed as a descriptive indicator for quantifying cracking tendency.
Author(s)
Böhne, Christoph
Laboratory for Material and Joining Technology, Paderborn, Germany
Meschut, Gerson
Laboratory for Material and Joining Technology, Paderborn, Germany
Biegler, Max
Fraunhofer-Institut fĂĽr Produktionsanlagen und Konstruktionstechnik IPK
Rethmeier, Michael
Fraunhofer-Institut fĂĽr Produktionsanlagen und Konstruktionstechnik IPK
Zeitschrift
Welding journal
Project(s)
Methodenentwicklung zur Vermeidung von Liquid Metal Embrittlement während des Widerstandspunktschweißens von hochfesten Stahlwerkstoffen
Funding(s)
Sachbeihilfen
Funder
Deutsche Forschungsgemeinschaft -DFG-, Bonn
Thumbnail Image
DOI
10.29391/2022.101.015
Language
English
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Fraunhofer-Institut fĂĽr Produktionsanlagen und Konstruktionstechnik IPK
Tags
  • Liquid Metal Embrittl...

  • Crack

  • Advanced High-Strengt...

  • Resistance Spot Weldi...

  • Welding Current

  • Heat Input

  • Simulation

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