Mechanics and pyrolysis analyses of rotation welding with pretreated wood dowels

This study examined the mechanics and pyrolysis analyses of rotation welding with treated dowels. Test results indicated that welding specimens with dowels immersed in CuCl 2 solution exhibited higher pullout resistance than untreated specimens. Scanning electron microscopy was used to observe and analyze the welding interface. Wood dowels immersed in CuCl 2 solution provided more flowing molten polymer to obtain better connection than untreated wood dowels. Based on the chemical analyses of X-ray photoelectron spectroscopy, and thermogravimetric analyses, the hydrolysis of cellulose and hemicellulose was detected after immersion of the dowels in a CuCl 2 solution. Pyrolysis of cellulose, hemicellulose and lignin occurred during the welding process. The hydrolysis of cellulose and hemicellulose may promote the pyrolysis and efficient connection of wood components during the welding process.