Numerical and Experimental Study on Seam Welding Behavior in Extrusion of Micro-Channel Tube

Abstract:

Micro-channel tube with submillimeter-diameter channels is a kind of newly developed heat transfer tube based on theory of micro-scale heat transfer. As the micro-channel tube has multiple welding points and work under high pressure condition, welding strength is one of the key problems for the extrusion process. This paper presented a new method in evaluation of the seam welding strength formed in the extrusion process. Firstly, FE simulation is carried out for the status of the billet in the welding chamber during the extrusion process. Then, thermo mechanical experiment is done for the relationship between the welding strength and three key factors. Combining the relationship with the numerical results, welding strength of the micro-channel tube can be evaluated. Pressure bearing test shows that the evolution method is reliable. The study is helpful for the optimization the extrusion process and improvement of the seam weld quality.

• Periodical: Key Engineering Materials (Volume 491)
• Pages: 189-195
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.491.189
• Online since: September 2011
• Authors: Ding Tang, Qing Qing Zhang, Da Yong Li, Ying Hong Peng
• Keywords: Aluminum Extrusion, Micro-Channel Tube, Seam Welding

References

[1] Björn, P. (2010) Heat transfer in micro-channels, Nanoscale and Microscale Thermophysical Engineering, Vol. 5, pp.155-175.

[2] Hiramoto, K., Minami, S., Sakihama, H. (2009) Development of the Latest Heat Exchanger Tube Technology. Proceedings of the 9th International.

[3] Lee S. H., J. M. , Lee, Jo, H. H., Jo, H., Kim B. M. (2008) Process analysis and die design in 12 cells condenser tube extrusion of Al3003. Journal of Materials Processing Technology., Vol. 201, pp.53-59.

DOI: 10.1016/j.jmatprotec.2007.11.246

[4] Loukus, A., Subhash, G., Imaninejad, M. (2004) Mechanical properties and microstructural characterization of extrusion welds in AA6082-T4. Journal of Materials Science. Vol. 39, pp.6561-6569.

DOI: 10.1023/b:jmsc.0000044896.46771.ba

[5] Nanninga, N., White, C., Mills, O., Lukowski, J. (2010) Effect of specimen orientation and extrusion welds on the fatigue life of an AA6063 alloy. International Journal of Fatigue. Vol. 32, p.238–246.

DOI: 10.1016/j.ijfatigue.2009.06.004

[6] Akeret, R. (1992) Extrusion welds-quality aspects are now center stage, Proceedings of the Fifth International Aluminum Extrusion Technology Seminar, Aluminum Association, p.319–336.

[7] Donati, L., Tomesani, L., Giacomelli, V. (2004) Evaluation of a new FEM criterion for seam welds quality prediction in aluminum extruded profiles. Proceedings of Eighth International Aluminum Extrusion Technology Seminar. pp.221-235.

DOI: 10.1016/j.jmatprotec.2004.04.215

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

DOI: 10.1016/j.jmatprotec.2007.03.073

[9] Edwards, S. P., Den Bakker, A. J. , Zhou, J., Katgerman, L. (2009) Physical simulation of longitudinal weld seam formation during extrusion to produce hollow aluminum profiles. Materials and Manufacturing Processes. Vol. 24, pp.409-421.

DOI: 10.1080/10426910802714290

[10] Bariani, P.F., Bruschi, S., Ghiotti, A. (2006) Physical simulation of longitudinal welding in porthole-die extrusion. Annals of the CIRP. Vol. 55, pp.11-14.

DOI: 10.1016/s0007-8506(07)60418-1