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The Effects of Surface Topography and Lack of Fusion on The Fatigue Strength of Laser Hybrid Welds
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.ORCID-id: 0000-0003-4180-4710
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2009 (Engelska)Ingår i: Congress proceedings: ICALEO, 28th International Congress on Applications of Lasers & Electro-Optics, 2009, s. 38-46Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The geometrical aspects of laser hybrid welds (before, during and after the process) differ from autonomous laser welding and from arc welding. When studying the fatigue behaviour of laser hybrid welded fillet joints we identified that the micro-topography (i.e. the surface ripples) can be more important than the macrogeometry of the weld surface or lack of fusion (LOF), which frequently was detected. The plastic replica method was applied to measure the toe radii at the weld edges while the micro-topography was identified by interferometric profilometry. From metallurgical analysis of the joint interface, the tendency to LOF can be explained. Stress analysis was carried out by Finite element analysis (FEA) for the complex joint geometry and a bending load situation, showing maximum stress on the weld toes, even when including LOF. It was shown that the position and value of the maximum stress depends on a non-trivial combination of the weld geometry, including possible LOF, and the surface micro-topography. Thus it can be explained that at compressive stress conditions LOF does not contribute significantly to the fatigue strength of laser hybrid welds while the surface topography does. Recommendations for defining and in turn avoiding critical geometrical aspects during the welding process are discussed.

Ort, förlag, år, upplaga, sidor
2009. s. 38-46
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:kth:diva-61569Scopus ID: 2-s2.0-77953905839OAI: oai:DiVA.org:kth-61569DiVA, id: diva2:479370
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International Congress on Applications of Lasers & Electro-Optics. Orlando, Florida, USA. 02-11-09 → 05-11-09
Anmärkning
QC 20120507Tillgänglig från: 2012-01-17 Skapad: 2012-01-17 Senast uppdaterad: 2012-05-07Bibliografiskt granskad

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