Joining of Commercial Pure Copper via Self-reacting Friction Stir Welding

Document Type : Research Paper

Authors

Department of Materials Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Abstract

Three mm thick plates of commercial pure copper were welded via friction stir welding method using a floating bobbin tool. The effect of different process variables such as the tool transverse speed and the tool rotation speed were examined in order to create a weld with the desired properties. A defect-free weld was obtained at a rotation speed of 1400 rpm and a transverse speed of 18 mm/min with a shoulder pinching gap of 2.7 mm. After the welding process, the soundness of the welds was confirmed by non-destructive methods of visual inspection and X-ray radiography. The results of the transverse tensile test showed that the as-weld joint efficiency was 86.4%, which was higher than the joint efficiency made by the fusion welding method. The strength of the welds was such that the fracture of the workpiece was in the heat affected zone after the tensile test. On the other hand, the grain size of the weld was significantly less than the base metal. The lowest hardness around 40VHN was attributed to the middle of the thickness of the weld, while the highest hardness was in the vicinity of the lower shoulder of the tool, which was about 80 VHN.

Keywords

References

[1] Y. M. Hwang, P. L. Fan, C. H. Lin, Experimental study on Friction Stir Welding of copper metals, Journal of Materials Processing Technology 210 (2010) 1667-1672.
[2] K. Nakata, Friction stir welding of copper and copper alloys, Welding International 19 (2005) 929-933.
[3] Y. F. Sun, H. Fujii, Investigation of the welding parameter dependent microstructure and mechanical properties of friction stir welded pure copper, Materials Science and Engineering: A,  527 (2010) 6879-6886.
[4] N. Srirangarajalu, G. M. Reddy, S. R. K. Rao, A. Rajadurai, Microstructure and Mechanical Behaviour of Friction Stir Welded Copper, Springer Berlin Heidelberg (2012) 458-465.
[5] L. Cederqvist, T. Öberg, Reliability study of friction stir welded copper canisters containing Sweden's nuclear waste, Reliability Engineering & System Safety 93 (2008) 1491-1499.
[6] K. Okamoto, Fabrication of Backing Plates of Copper Alloy by Friction Stir Welding, 3rd International Friction Stir Welding Conference, Kobe, Japan, 2001.
[7] Z. Y. Ma, A. H. Feng, D. L. Chen, J. Shen, Recent Advances in Friction Stir Welding/Processing of Aluminum Alloys: Microstructural Evolution and Mechanical Properties, Critical Reviews in Solid State and Materials Sciences 43 (2017) 269-333.
[8] S. W. Kallee, Industrial applications of friction stir welding, Friction Stir Welding, Woodhead Publishing (2010)118-163.
[9] L. Cederqvist, A Weld that Lasts for 100,000 Years: Friction Stir Welding of Copper Canisters, MRS Proceedings 807 (2003).
[10] K. Fuse, V. Badheka, Bobbin tool friction stir welding: a review, Science and Technology of Welding and Joining, 24 (2018) 277-304.
[11] G.Q. Wang, Y.-H. Zhao, Y.-Y. Tang, Research Progress of Bobbin Tool Friction Stir Welding of Aluminum Alloys: A Review, Acta Metallurgica Sinica (English Letters) 33 (2019) 13-29.
[12] M. K. Sued, D. Pons, J. Lavroff, E. H. Wong, Design features for bobbin friction stir welding tools: Development of a conceptual model linking the underlying physics to the production process, Materials & Design 54 (2014) 632-643.
[13] Y. X. Huang, L. Wan, S. X. Lv, J. C. Feng, Novel design of tool for joining hollow extrusion by friction stir welding, Science and Technology of Welding and Joining 18 (2013) 239-246.
[14] F. F. Wang, W. Y. Li, J. Shen, Q. Wen, J. F. dos Santos, Improving weld formability by a novel dual-rotation bobbin tool friction stir welding, Journal of Materials Science & Technology 34 (2018) 135-139.
[15] S. Chen, H. Li, S. Lu, R. Ni, J. Dong, Temperature measurement and control of bobbin tool friction stir welding, The International Journal of Advanced Manufacturing Technology 86 (2015) 337-346.
[16] W.-B. Lee, S.-B. Jung, The joint properties of copper by friction stir welding, Materials Letters 58 (2004) 1041-1046.
[17] G. M. Xie, Z. Y. Ma, L. Geng, Development of a fine-grained microstructure and the properties of a nugget zone in friction stir welded pure copper, Scripta Materialia 57 (2007) 73-76.
[18] T. Sakthivel, J. Mukhopadhyay, Microstructure and mechanical properties of friction stir welded copper, Journal of Materials Science 42 (2007) 8126-8129.
[19] H. J. Liu, J. J. Shen, Y. X. Huang, L. Y. Kuang, C. Liu, C. Li, Effect of tool rotation rate on microstructure and mechanical properties of friction stir welded copper, Science and Technology of Welding and Joining 14 (2013) 577-583.
[20] J. J. Shen, H. J. Liu, F. Cui, Effect of welding speed on microstructure and mechanical properties of friction stir welded copper, Materials & Design 31 (2010) 3937-3942.
[21] P. Xue, B. L. Xiao, Q. Zhang, Z. Y. Ma, Achieving friction stir welded pure copper joints with nearly equal strength to the parent metal via additional rapid cooling, Scripta Materialia 64 (2011) 1051-1054.
[22] Y. F. Sun, H. Fujii, The effect of SiC particles on the microstructure and mechanical properties of friction stir welded pure copper joints, Materials Science and Engineering: A, 528 (2011) 5470-5475.
[23] H. Khodaverdizadeh, A. Mahmoudi, A. Heidarzadeh, E. Nazari, Effect of friction stir welding (FSW) parameters on strain hardening behavior of pure copper joints, Materials & Design 35 (2012) 330-334.
[24] A. Kumar, L. S. Raju, Influence of Tool Pin Profiles on Friction Stir Welding of Copper, Materials and Manufacturing Processes 27 (2012) 1414-1418.
[25] H. Khodaverdizadeh, A. Heidarzadeh, T. Saeid, Effect of tool pin profile on microstructure and mechanical properties of friction stir welded pure copper joints, Materials & Design 45 (2013) 265-270.
[26] I. Galvão, R. M. Leal, D. M. Rodrigues, A. Loureiro, Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets, Journal of Materials Processing Technology 213 (2013) 129-135.
[27] J.W. Lin, H.C. Chang, M.-H. Wu, Comparison of mechanical properties of pure copper welded using friction stir welding and tungsten inert gas welding, Journal of Manufacturing Processes 16 (2014) 296-304.
[28] J. Teimurnezhad, H. Pashazadeh, A. Masumi, Effect of shoulder plunge depth on the weld morphology, macrograph and microstructure of copper FSW joints, Journal of Manufacturing Processes 22 (2016) 254-259.
[29] N. Xu, Q. Song, Y. Bao, Enhanced strength and ductility of friction stir welded Cu joint by using large load with extremely low welding and rotation speed, Materials Letters 205 (2017) 219-222.
[30] X. C. Liu, Y. F. Sun, T. Nagira, K. Ushioda, H. Fujii, Experimental evaluation of strain and strain rate during rapid cooling friction stir welding of pure copper, Science and Technology of Welding and Joining 24 (2018) 352-359.
[31] P. Sahlot, A. K. Singh, V. J. Badheka, A. Arora, Friction Stir Welding of Copper: Numerical Modeling and Validation, Transactions of the Indian Institute of Metals 72 (2019) 1339-1347.
[32] A. Heidarzadeh, Ö. M. Testik, G. Güleryüz, R. V. Barenji, Development of a fuzzy logic based model to elucidate the effect of FSW parameters on the ultimate tensile strength and elongation of pure copper joints, Journal of Manufacturing Processes 53 (2020) 250-259.
 [33] A. Moaref, A. Rabiezadeh, Microstructural evaluation and tribological properties of underwater friction stir processed CP-copper and its alloy, Transactions of Nonferrous Metals Society of China 30 (2020) 972-981.
[34] R. M. Leal, N. Sakharova, P. Vilaça, D. M. Rodrigues, A. Loureiro, Effect of shoulder cavity and welding parameters on friction stir welding of thin copper sheets, Science and Technology of Welding and Joining 16 (2013) 146-152.
[35] L.J. Zhang, A comparative study on the microstructure and properties of copper joint between MIG welding and laser-MIG hybrid welding, Materials & Design 110 (2016) 35-50.
[36] N. Xu, R. Ueji, Y. Morisada, H. Fujii, Modification of mechanical properties of friction stir welded Cu joint by additional liquid CO2 cooling, Materials & Design  56 (2014) 20-25.
[37] P. Nagabharam, D. Srikanth Rao, J. Manoj Kumar, N. Gopikrishna, Investigation of Mechanical Properties of Friction Stir Welded pure Copper Plates, Materials Today: Proceedings 5 (2018) 1264-1270.
[38] H. Jamshidi Aval, S. Serajzadeh, A.H. Kokabi, Theoretical and experimental investigation into friction stir welding of AA 5086, The International Journal of Advanced Manufacturing Technology 52 (2010) 531-544.
[39] L.E. Murr, A Review of FSW Research on Dissimilar Metal and Alloy Systems, Journal of Materials Engineering and Performance 19 (2010) 1071-1089.
Iranian Journal of Materials Forming
Volume 7, Issue 2 - Serial Number 2
October 2020
Pages 44-55

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