Reduction of the hot cracking susceptibility of laser beam welds in AlMgSi alloys by increasing the number of grain boundaries

The grain structure of laser welded AlMgSi-alloys was varied by adapting the welding parameters and alloying additives. The hot cracking susceptibility was determined by the critical strain rate, measured by the application of digital image correlation in a self-restrained hot cracking test. A direc...

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Bibliographic Details
Published inScience and technology of welding and joining Vol. 24; no. 4; pp. 313 - 319
Main Authors Hagenlocher, Christian, Weller, Daniel, Weber, Rudolf, Graf, Thomas
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 19.05.2019
SAGE Publications
Subjects
aluminium alloys
critical strain rate
digital image correlation
grain refinement
grain structure
Hot cracks
laser beam welding
thermomechanical load
grain structure
digital image correlation
aluminium alloys
grain refinement
thermomechanical load
Hot cracks
critical strain rate
laser beam welding
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Summary:The grain structure of laser welded AlMgSi-alloys was varied by adapting the welding parameters and alloying additives. The hot cracking susceptibility was determined by the critical strain rate, measured by the application of digital image correlation in a self-restrained hot cracking test. A direct relation was found: The hot cracking susceptibility decreases with increasing number of grain boundaries across the width of the weld seam, i.e. along the effective load direction of transverse strain rates. It was shown, that the hot cracking susceptibility can be reduced by an optimisation of both the welding parameters and the alloying additives, which promote nucleation.
ISSN:1362-1718
1743-2936
DOI:10.1080/13621718.2018.1534775