期刊
APPLIED SURFACE SCIENCE
卷 256, 期 6, 页码 1936-1945出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.10.041
关键词
Surface geometry; Surface ripples; Topography; Crack; Fatigue; Hybrid weld
类别
资金
- VINNOVA - The Swedish Innovation Agency [27382-2]
- Nordic Industry Centre
Laser hybrid welding of an eccentric fillet joint causes a complex geometry for fatigue load by 4-point bending. The weld surface geometry and topography were measured and studied in order to understand the crack initiation mechanisms. The crack initiation location and the crack propagation path were studied and compared to Finite Element stress analysis, taking into account the surface macro-and micro-geometry. It can be explained why the root and the upper weld toe are uncritical for cracking. The cracks that initiate from the weld bead show higher fatigue strength than the samples failing at the lower weld toe, as can be explained by a critical radius for the toe below which surface ripples instead determine the main stress raiser location for cracking. The location of maximum surface stress is related to a combination of throat depth, toe radius and sharp surface ripples along which the cracks preferably propagate. (C) 2009 Elsevier B.V. All rights reserved.
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