Abstract
Welding of wood is a well-known joining procedure that offers several advantages over traditional mechanical fasteners or gluing. During welding, extensive solid-state transformation phases occur in the so-called melting zone and the heat-affected zone. The nature and the extension of such transformations are correlated to the energy input and thus to the heat generated during the process at the wood joint interface. In the present work the influence of the welding parameters and wood grain orientation on the temperature profile and distribution and final strength of welded connections was investigated. For this purpose, the characteristics of the joints were evaluated with both destructive and non-destructive techniques. Non-destructive evaluation was performed with infrared thermography, which allowed measurement of the maximal and average peak temperature, temperature profile and distribution, and rate of temperature increase. Thus, this technique can also be used to detect welding defects and to provide information on material modification during welding.
References
Banerjee, P., Govardhan, S., Wikle, H.C., Liu, J.Y., Chin, B.A. (1993) Infrared sensing for on-line weld process monitoring and control. J. Manuf. Sci. Eng.115:907–918.Search in Google Scholar
Davé, V.R., Cola, M.J., Hussen, N.A. (2001) Heat generation in inertia welding of dissimilar tubes. Weld. J. Res. Suppl.10:246–252.Search in Google Scholar
European standard (2003) EN 205, Adhesives – Wood adhesives for non-structural applications. Determination of the tensile-shear strength of lap joints.Search in Google Scholar
Fengel, D., Wegener, G. (2003) Wood – Chemistry, Ultrastructure, Reactions. Verlag Kessel, Remagen, 2003.Search in Google Scholar
Ganne-Chédeville, C., Pizzi, A., Thomas, A., Leban, J.-M., Bocquet, J.-F., Despres, A., Mansouri, H. (2005) Parameter interactions, two-block welding and the wood nail concept in wood dowels welding. J. Adhes. Sci. Technol.19:1157–1174.10.1163/156856105774429037Search in Google Scholar
Gerber, C., Gfeller, B. (2000) Joint connection with welded thermoplastic dowels and Wood Welding Technologies. In: Proceedings of the World Conference on Timber Engineering, British Columbia, Canada.Search in Google Scholar
Gfeller, B., Properzi, M. (2003) Woobration, CTI scientific report. BFH-HSB, Bienne, Switzerland.Search in Google Scholar
Gfeller, B., Pizzi, A., Zanetti, M., Properzi, M., Pichelin, F., Lehmann, M., Delmotte, L. (2004) Solid wood joints by in situ welding of structural wood constituents. Holzforschung58:45–52.10.1515/HF.2004.007Search in Google Scholar
Gliniorz, K.U., Mohr, S., Natterer, J., Navi, P. (2001) Wood welding. In: Proceedings of the 1st International Conference of the European Society for Wood Mechanics, Lausanne, Switzerland.Search in Google Scholar
Kulticova, E.V. (1999) Structure and proprieties relationship of densified wood. M.Sc. Thesis, Polytechnic Institute and State University, Blacksburg, VA, USA.Search in Google Scholar
Leban, J.-M., Pizzi, A., Wieland, S., Zanetti, M., Properzi, M., Pichelin, F. (2004) X-Ray microdensitometry analysis of vibration-welded wood. J. Adhes. Sci. Technol.18:673–685.10.1163/156856104839310Search in Google Scholar
Lin, C.B., Mu, C.K., Wu, W.W., Hung, C.H. (1999) The effect of joint design and volume fraction on friction welding proprieties of A360/SiC (p) composites. Weld. J. Res. Suppl3:100–108.Search in Google Scholar
Meola, C., Squillace, A., Minutolo, F.M.C., Morace, R.E. (2004) Analysis of stainless steel welded joints: a comparison between destructive and non-destructive techniques. J. Mater. Process. Technol.155:1893–1899.10.1016/j.jmatprotec.2004.04.303Search in Google Scholar
Pichelin, F., Pizzi, A., Frühwald, A. (2000) Improving oriented strand board proprieties by using high moisture tolerant adhesives. In: Proceedings of the International Conference on Wood and Wood Fiber Composites, Otto-Graf-Institute, Stuttgart, Germany, pp. 429–438.Search in Google Scholar
Properzi, M., Leban, J.-M., Pizzi, A., Wieland, S., Pichelin, F., Lehamann, M. (2005) Influence of the grain direction in vibrational wood welding. Holzforschung59:23–27.10.1515/HF.2005.004Search in Google Scholar
Stamm, B., Natterer, J., Navi, P. (2005) Joining of wood by friction welding. Holz Roh Werkst.63:313–320.10.1007/s00107-005-0007-6Search in Google Scholar
Sundqvist, B. (2004) Colour change and acid formation in wood during heating. PhD. Thesis, Lulea University of Technology, Sweden.Search in Google Scholar
Sutthoff, B., Franz, U., Hentschel, H., Schaaf, A. (1996) Verfahren zum reibschweissartigen Fügen und Verbinden von Holz. German Patent DE 19620273 C2.Search in Google Scholar
Venkatraman, B., Baldev, R., Menaka, M. (2005) Online infrared detection of inclusions and lack of penetration during welding. Mater. Eval.9:933–937.Search in Google Scholar
Wang, Y., Chin, B.A. (1986) Online sensing of weld penetration using infrared thermography. Opt. Tech. Insp.34:314–320.Search in Google Scholar
Wieland, S., Shi, B., Pizzi, A., Properzi, M., Stampanoni, M., Abela, R., Lu, X., Pichelin, F. (2005) Vibration welding of wood: X-ray tomography, additives, radical concentration. For. Prod. J.55:84–87.Search in Google Scholar
Wikle, H.C., Kottilingam, R.H., Zee, R.H., Chin, B.A. (2001) Infrared sensing technique for penetration depth control of the submerged arc welding process. J. Mater. Process. Technol.113:228–233.10.1016/S0924-0136(01)00587-8Search in Google Scholar
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