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Linear friction welding of spruce boards: experimental investigations on scale effects due to humidity evaporation

Hahn, Benjamin ; Stamm, Bernhard ; Weinand, Yves

In: Wood Science and Technology, 2014, vol. 48, no. 4, p. 855-871

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    Titre
    • Linear friction welding of spruce boards: experimental investigations on scale effects due to humidity evaporation
    Auteur
    • Hahn, Benjamin. Laboratory for Timber Construction IBOIS, EPFL Lausanne, Lausanne, Switzerland
    • Stamm, Bernhard. Laboratory for Timber Construction IBOIS, EPFL Lausanne, Lausanne, Switzerland
    • Weinand, Yves. Laboratory for Timber Construction IBOIS, EPFL Lausanne, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Wood Science and Technology, 2014, vol. 48, no. 4, p. 855-871. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325982
    Summary
    Recent investigations on friction-welded wood-to-wood connections have shown interesting capacities of these adhesive-free joints for further development towards constructional elements. This paper addresses challenges and technical requirements for the enhancement of this technology from small specimens to samples of structural scale. Inhomogeneities in bonding quality and joint strength, herein referred to as scale effects, become relevant with an increase in size of the welded interface. It is assumed that the water vapour and smoke that evolves during the welding process by evaporation of moisture within the cell structure is a reason for these inhomogeneities. In order to achieve a better understanding of these effects, the influence of the water vapour on welded spruce (Picea abies) boards was investigated. It was shown that the vapour increases the internal gas pressure within the welding zone. Thus, it strongly influences the welding process and the quality of the joint. The results of these investigations lead to technical solutions, permitting a significant attenuation of the negative effects and improvement in quality and joint resistance.