Impact of liquid metal embrittlement cracks on resistance spot weld static strength

Advanced high strength steels used in automotive structural components are commonly protected using zinc coatings. However, the steel/zinc system creates the potential for liquid metal embrittlement (LME) during welding. Although LME cracks are known to form, limited research has found any detriment...

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Bibliographic Details
Published inScience and technology of welding and joining Vol. 24; no. 3; pp. 218 - 224
Main Authors DiGiovanni, Christopher, Biro, Elliot, Zhou, Norman Y.
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 03.04.2019
SAGE Publications
Subjects
advanced high strength steel
cracking
galvanised coating
lap shear testing
Liquid metal embrittlement
resistance spot welding
weld strength
resistance spot welding
advanced high strength steel
weld strength
galvanised coating
Liquid metal embrittlement
cracking
lap shear testing
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Summary:Advanced high strength steels used in automotive structural components are commonly protected using zinc coatings. However, the steel/zinc system creates the potential for liquid metal embrittlement (LME) during welding. Although LME cracks are known to form, limited research has found any detrimental impact of LME cracks on weld strength. In this work, a comparison of zinc coated and uncoated advanced high strength steel joints showed LME decreased strength in welds from transformation induced plasticity type microstructures and an 1100 MPa ultimate tensile strength by 43.6%. LME cracks were observed to propagate until final fracture. However, only cracks located in the periphery of the weld area were found contribute to a loss in strength.
ISSN:1362-1718
1743-2936
DOI:10.1080/13621718.2018.1518363