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    Wettability of welded wood-joints investigated by the Wilhelmy method: part 1. Determination of apparent contact angles, swelling, and water sorption

    Year: 2021

    Journal: Holzforschung, Volume 75, JAN, page 65–74

    Authors: Vaziri, Mojgan; Karlsson, Olov; Abrahamsson, Lars; Lin, Chia-Feng; Sandberg, Dick

    Organizations: Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS) [2017-01157]

    Keywords: beech; fourier transform infrared spectroscopy (FTIR); pine; scanning electron microscopy (SEM); welding time

    This study presents a novel application of the Wilhelmy plate method on welded joints of Scots pine sapwood and beech. Welding resulted in an increase in the contact angle (increased hydrophobicity) as well as a decrease in the water uptake and swelling of the welded pine-joint compared to non-welded pine. When the welding time was extended from 4 to 5 s, these properties were further pronounced. Welding of beech, on the other hand, led to an increase in the contact angle and a decrease in the water uptake, but an increase in the swelling. Fourier Transform Infrared spectroscopy showed that welding increased the aliphatic C-H and unsaturated C=C stretching absorption bands in pine and beech. Scanning electron microscopy showed a dense structure at the welded joints of the both species, giving evidence of a lower porosity that leads to a lower permeability as a result of the welding.
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