期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 24, 期 4, 页码 313-319出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2018.1534775
关键词
Hot cracks; laser beam welding; aluminium alloys; digital image correlation; grain structure; critical strain rate; grain refinement; thermomechanical load
资金
- Constellium
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.
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