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Variation of shear properties of welded spruce at different pressures and welding times

Abstract : This work presents a study of mechanical properties of the wood end-grain welding of spruce wood. The shear properties of butt joints of spruce at different pressure and welding time were studied. Between all the parameters of spruce welding, the welding pressure is one of the most important in relation to the mechanical properties. Thus, a good joint strength was obtained for spruce wood at high pressure. An increase of shear strength is observed with an increase in welding pressure. It is clear that at high pressure the welded material becomes more rigid and this is also coupled to the to the more extensive condensation reaction of lignin. The defibration tendency in end-grain-to-end-grain welding indicates that wood spruce welding is possible and yields sufficient joint strength. The welded interphase in end-grain-to-end-grain spruce welding appears possible and gives a joint with an anatomical appearance of a “natural” fingerjoint. Such “natural” fingerjoints can give equivalent than glued fingerjoints. The advantages of the end-grain-to-end-grain welding are then the very short time of processing, the dispensation of preparing the fingerjoint profiles and to avoid the use of adhesives.
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Submitted on : Monday, October 2, 2017 - 12:13:19 PM
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S. Amirou, A. Pizzi, H. Luo. Variation of shear properties of welded spruce at different pressures and welding times. Biotribology, Elsevier, 2016, 5, pp.61 - 66. ⟨10.1016/j.biotri.2015.09.001⟩. ⟨hal-01599545⟩



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