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The impact of weld shape on fatigue cracking of eccentric geometry laser hybrid welds under bending load
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0002-3569-6795
Royal Institute of Technology, Department of Aeronautical and Vehicle Engineering, Stockholm.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0003-0910-7990
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2010 (English)In: Istanbul IIW 2010: proceedings of the International Conference on Advances in Welding Science & Technology for Construction, Energy & Transportation, AWST 2010, Swissôtel "The Bosphorus", Istanbul/Turkey, from July 15 - 16. July, 2010 ; [is being held in conjunktion with the 63rd Annual Assembly & International Conference of the International Institute of Welding] / [ed] Mustafa Kocak, Istanbul: Ridgeview Publishing Company, 2010, p. 253-259Conference paper, Published paper (Refereed)
Abstract [en]

A butt joint of two 10 mm thick stainless steel plates, but 5 mm vertically eccentric to each other, was laser hybrid welded. The weld experiences four point bending fatigue load such that the root stress remains compressive. Thus only the stress formation at the top of the weld was studied, both by fatigue testing and by linear elastic fracture mechanics analysis. The location of the peak stress for crack initiation as well as the direction and speed of crack propagation can be well explained. Weld throat depth, weld toe radii and surface roughness compete against each other for determining the peak stress. It was also shown why occasional lack of fusion has only limited impact on the peak stress and fatigue life. Optimization of the laser beam contribution is responsible for full penetration and for avoiding lack of fusion. Optimization of the MIG-process is essential, as governing the top shape. Beside stress analysis including the topography, the propagation of the cracks along surface resolidification ripples was an indicator that surface roughness has essential impact. Several approaches were developed and studied for systematic documentation and generalization of the discovered knowledge.

Place, publisher, year, edition, pages
Istanbul: Ridgeview Publishing Company, 2010. p. 253-259
National Category
Manufacturing, Surface and Joining Technology Applied Mechanics
Research subject
Manufacturing Systems Engineering; Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-26961Local ID: 03d4143a-1fe4-4b73-b597-be0600948168ISBN: 978-6-05-614191-1 (electronic)OAI: oai:DiVA.org:ltu-26961DiVA, id: diva2:1000142
Conference
International Conference on Advances in Welding Science & Technology for Construction, Energy & Transportation : 15/07/2010 - 16/07/2010
Note
Godkänd; 2011; 20110406 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-09-05Bibliographically approved

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Kaplan, AlexanderAlam, Md. MinhajJonsén, PärHäggblad, Hans-ÅkeIlar, Torbjörn

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Kaplan, AlexanderAlam, Md. MinhajJonsén, PärHäggblad, Hans-ÅkeIlar, Torbjörn
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Product and Production DevelopmentMechanics of Solid Materials
Manufacturing, Surface and Joining TechnologyApplied Mechanics

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