Abstract 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.

中文翻译：

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通过 Wilhelmy 方法研究的焊接木接头的润湿性：第 1 部分。表观接触角、溶胀和吸水率的测定

摘要 本研究介绍了 Wilhelmy 板法在苏格兰松边材和山毛榉焊接接头上的新应用。与非焊接松木相比，焊接导致接触角增加（疏水性增加）以及焊接松木接头的吸水和溶胀降低。当焊接时间从 4 秒延长到 5 秒时，这些性能进一步显着。另一方面，榉木的焊接导致接触角增加和吸水量减少，但膨胀增加。傅里叶变换红外光谱表明，焊接增加了松树和山毛榉的脂肪族 C-H 和不饱和 C=C 伸缩吸收带。扫描电子显微镜显示两种物种的焊接接头处都有致密的结构，