Seam Welds Modeling and Mechanical Properties Prediction in the Extrusion of AA6082 Alloy

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This work summarizes the outcome of recent research by the authors on modeling the formation of seam welds in aluminum extrusion and on evaluating the related mechanical properties on the final products. A profile with a seam weld in the middle section was produced with different die designs in order to investigate the relation between die design and local welding parameters, such as contact pressure, temperature, time of contact, strain and strain rate paths. The local welding conditions were evaluated by complete thermo-mechanical 3D FEM simulation of the processes. Specimens were extracted from the profiles and tensile tested, the resulting mechanical properties being discussed with respect to the local welding conditions. The possibility to adopt criteria for assessing the welding quality is discussed, together with the effect of high speed damage cracking.

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Edited by:

Luca Tomesani and Lorenzo Donati

Pages:

125-136

Citation:

L. Donati and L. Tomesani, "Seam Welds Modeling and Mechanical Properties Prediction in the Extrusion of AA6082 Alloy", Key Engineering Materials, Vol. 367, pp. 125-136, 2008

Online since:

February 2008

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$38.00

[1] Akeret R., Properties of pressure welds in extruded aluminum alloy sections, journal of the institute of metals, 10, (1972), p.202.

[2] Akeret R., Extrusion welds-Quality aspects are now center stage, Proceedings of ET 1992, vol. I, (1992) pp.319-336.

[3] Valberg H., Extrusion welding in aluminium extrusion, Int. J. of Materials and Product Technology, Vol. 17, N. 7, 2002, pp.497-556.

DOI: https://doi.org/10.1504/ijmpt.2002.001317

[4] Valberg H., Loeken T., Hval M., The extrusion of hollow profiles with a gas pocket behind the bridge, Int. J. of Materials and Product Technology, Vol. 10, Nos 3-6, (1995), pp.222-267.

[5] Plata M., Piwnik J., Theoretical and experimental analysis of seam weld formation in hot extrusion of aluminum alloys, Proc. 7 th Int. aluminum extrusion technology seminar ET 2000, vol. I, (2000), pp.205-211.

[6] Bourqui B, A. Huber, C Moulin, A. Bunetti, Improved weld seam quality using 3D FEM simulations in correlation with practice, Proceedings of first EAA (European Aluminum Association-extruders division-) Montichiari -BS-, (2002).

[7] Donati L., Tomesani L., The prediction of seam welds quality in aluminum extrusion, Journal of Material Processing Technology, 153-154, (2004), pp.366-373.

DOI: https://doi.org/10.1016/j.jmatprotec.2004.04.215

[8] Donati L., Tomesani L., Evaluation of a new FEM criterion for seam welds quality prediction in aluminum extruded profiles, Proceedings of 8 th Int. Conf. Aluminum Extrusion technology Seminar (ET2004), Orlando, 18-21 May 2004, vol. 2, pp.221-235.

[9] Donati L., Tomesani L., The effect of die design on the production and seam weld quality of extruded aluminium profiles, J. of Material Processing Technology, 164-165 (2005) pp.1025-1031.

DOI: https://doi.org/10.1016/j.jmatprotec.2005.02.156

[10] Fratini L., Tomesani L., Donati L., Buffa G., Solid state bonding in extrusion and FSW: process mechanics and analogies, J. Mat. Processing Technology, 177/1-3 (2006), pp.344-347.

DOI: https://doi.org/10.1016/j.jmatprotec.2006.04.042

[11] J. Lof, J. Heutink, FEM simulations of the material flow in the bearing area of the aluminum extrusion process, Proc. 7 th Int. aluminum extrusion technology seminar ET 2000, vol. II, (2000) pp.211-222.

[12] Edwards S. -P., Bakker A.J. den, Neijenhuis J.L., Kool W.H., Katgerman L., JSME International Journal, Series A 49/1, (2006), pp.63-68.

[13] Donati L., Tomesani L., Minak G., Characterization of seam weld quality in AA6082 extruded profiles Journal of Materials Processing Technology 191 (2007) pp.127-131.

DOI: https://doi.org/10.1016/j.jmatprotec.2007.03.073

[14] Donati L., Tomesani L., Deformability prediction in aluminum extruded hollow profiles by means of process simulation, Acts 7° Conf. AITEM Lecce, September 2005, pp.123-124.

[15] Donati L., Tomesani L., Prediction of hot damage in aluminum extrusion by means of FEM simulations, Proc. 7th WCCM (World Congress on Computational Mechanics) Los Angeles (2006).