Evaluation of X-shaped welded joints with Co-Cr alloy under different welding parameters: analysis by micro-CT and flexural strength
Keywords:Dental Alloys; Dental Soldering; Flexural strength.
AbstractThis study evaluated the mechanical strength correlated to the percentage of the total volume of weld and porosities of Co-Cr alloy joints welded with TIG technique. Thirty specimens were perpendicularly sectioned to the long-axis and rejoined by using X30-shaped joint design with TIG welding. They were divided into 3 groups (n=10): the CG1 with a 60-A depth and 90-ms pulse; the CG2 with a 60-A depth and 120-ms pulse and the CG3 with a 60-A depth and 160-ms pulse. The specimens were submitted to nondestructive tests: radiographic inspection, penetrant liquid and Micro- CT (to calculate the percentage of the total volume of welding and the porosities) and then tested with 3-point bending. The fracture surfaces were analyzed with scanning electron microscopy (SEM). The data were statistically analyzed with 1-way ANOVA and the Tukey post hoc test for all the variables which were analyzed: flexural strength, total volume of weld and porosities. Pearson correlation test was also applied (ɑ=.05). The 1-way ANOVA showed that the factors machine parameters were not significant for flexural strength values (P=.231), the total volume of weld (P=.057) and porosities (P=.057). There are no significant relationships between any pair of variables after Pearson correlation test (P >.050). This, suggesting that the three machine regulation can be an option for joining prefabricated Co-Cr rods in this kind of union.
Atoui, J. A., Felipucci, D. N. B., Pagnano, V. O., Orsi, I. A., Nóbilo, M. A. A., & Bezzon, O. L. (2013). Tensile and flexural strength of commercially pure titanium submitted to laser and tugsten inert gas welds. Brazilian Dental Journal, 24(6):630-634. https://doi.org/10.1590/0103-6440201302241
Akman, E., Demir, A., Canel, T., & Sinmazçelik, T. (2009). Laser welding of Ti6Al4V titanium alloy. Journal of Materials Processing Technology, 209(8):3705-3713. https://doi.org/10.1016/j.jmatprotec.2008.08.026
Baba, N., & Watanabe, I. (2005). Penetration deph into dental casting alloys by Nd:YAG laser. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 72(1):64-68. https://doi.org/10.1002/jbm.b.30117
Barbi, F. C. L., Camarini, E. T., Silva, R. S., Endo, E. H., & Pereira, J. R. (2012). Comparative analysis of different joining techniques to improve the passive fit of cobalt-chromium superstructures. The Journal of Prosthetic Dentistry, 108(6):377-385. https://doi.org/10.1016/S0022-3913(12)60196-6
Berg, E., Wagner, W. C., Davik, G., & Dootz, E. R. (1995). Mechanical properties of laser-welded cast and wrought titanium. The Journal of Prosthetic Dentistry, 74 (3):250-257. https://doi.org/10.1016/S0022-3913(05)80131-3
Byrne, G. (2011). Soldering in prosthodontics - an overview, part I. Journal of Prosthodontics, 20(3):233-243. https://doi.org/10.1111/j.1532-849X.2011.00691.x
Castro, G. C., Araújo, C. A., Mesquita, M. F., Consani, R. L. X., & Nóbilo, M. A. A. (2013). Stress distribution in Co-Cr implant frameworks after laser or TIG welding. Brazilian Dental Journal, 4(2):147-151. https://doi.org/10.1590/0103-6440201302112
Castro, M. G., Araújo, C. A., Menegaz, G. L., Lyra e Silva, J. P., Nóbilo, M. A. A., & Simamoto-Júnior, P. C. (2015). Laser and Plasma dental soldering techniques applied to Ti-6Al-4V alloy: Ultimate tensile strength and finite elemento analysis. The Journal of Prosthetic Dentistry, 113(5):460-466. https://doi.org/10.1016/j.prosdent.2014.10.008
Chai, T., & Chou, C. K. (1998). Mechanical properties of laser-welded cast titanium joints under different conditions. The Journal of Prosthetic Dentistry, 79(4):477-483. https://doi.org/10.1016/S0022-3913(98)70165-9
Kokolis, J., Chakmakchi, M., Theocharopoulos, A., Prombonas, A., & Zinelis, S. (2015). Mechanical and interfacial characterization of laser welded Co-Cr alloy with diferente joint configurations. The Journal of Advanced Prosthodontics, 7(1):39-46. https://doi.org/10.4047/jap.2015.7.1.39
Lyra e Silva, J. P., Fernandes Neto, A. J., Raposo, L. H. A., Novais, V. R., Araujo, C. A., Cavalcante, L. A. L., & Simamoto-Júnior, P.C. (2012). Effect of plasma welding parameters on the flexural strength of Ti-6Al-4V alloy. Brazilian Dental Journal, 23(6):686-691. https://doi.org/10.1590/S0103-64402012000600010
Matos, I. C., Bastos, I. N., Diniz, M. G., & Miranda, M. S. (2015). Corrosion in artificial saliva of a Ni-Cr-based dental alloy joined by TIG welding and conventional brazing. The Journal of Prosthetic Dentistry, 114(2):278-285. https://doi.org/10.1016/j.prosdent.2015.01.017
Nuñez-Pantoja, J. M. C., Takahashi, J. M. F. K., Nóbilo, M. A. A., Consani, R. L. X., & Mesquita, M. F. (2011). Radiographic inspection of porosity in Ti-6Al-4V laser-welded joints. Brazilian Oral Research, 25(2):103-108. https://doi.org/10.1590/S1806-83242011005000005
Nuñez-Pantoja, J. M. C., Farina, A. P., Vaz, L. G., Consani, R. L. X., Nóbilo, M. A.A., & Mesquita, M. F. (2012). Fatigue strength: effect of welding type and joint design executed in Ti-6Al-4V structures. Gerodontology, 29(2):e1005-e1010. https://doi.org/10.1111/j.1741-2358.2011.00598.x
Rocha, R., Pinheiro, A. L. B., & Villaverde, A. B. (2006). Flexural strength of pure Ti, Ni-Cr and Co-Cr alloys submitted to Nd:YAG laser or TIG welding. Brazilian Dental Journal, 17(1):20-23. http://dx.doi.org/10.1590/S0103-64402006000100005
Silveira-Júnior, C. D., Castro, M. G., Davi, L. R., Neves, F. D., Novais, V. R., & Simamoto-Júnior, P. C. (2012). Welding techniques in dentistry. In: Kovacevic R (Ed.), Welding Processes. (17a ed.), Croatia: In tech.
Simamoto-Júnior, P. C., Novais, V. R., Machado, A. R., Soares, C. J., & Raposo, L. H. A. (2015). Effect of joint design and welding type on the flexural strength and wel penetration of Ti-6Al-4V alloy bars. The Journal of Prosthetic Dentistry, 113(5):467-474. https://doi.org/10.1016/j.prosdent.2014.10.010
Takayama, Y., Nomoto, R., Nakajima, H., & Ohkubo, C. (2012). Effects of argon flow rate on laser-welding. Dental Materials Journal, 31(2):316-326. https://doi.org/10.4012/dmj.2011-158
Takayama, Y., Nomoto, R., Nakajima, H., & Ohkubo, C. (2013) Comparasion of joint designs for laser welding of cast metal plates and wrought wires. Odontology, 101:34-42. https://doi.org/10.1007/s10266-011-0049-7
Taylor, J. C., Hondrum, S. O., Prasad A., & Brodersen C. A. (1998). Effects of joint configuration for the arc welding of cast Ti-6Al-4V alloy rods in argon. The Journal of Prosthetic Dentistry, 79(3):291-297. https://doi.org/10.1016/S0022-3913(98)70240-9
Wang, R. R., & Welsch, G. E. (1995). Joining titanium materials with tungsten inert gas welding, laser welding, and infrared brazing. The Journal of Prosthetic Dentistry, 74(5):521-530. https://doi.org/10.1016/S0022-3913(05)80356-7
Watanabe, I., & Topham, D. S. (2006). Laser welding of cast titanium and dental alloys using argon shielding. Journal of Prosthodontics, 15(2):102-107. https://doi.org/10.1111/j.1532-849X.2006.00082.x
Zupancic, R, Legat, A., & Funduk, N. (2006). Tensile strength and corrosion resistance of brazed and laser-welded cobalt-chromium alloy joints. The Journal of Prosthetic Dentistry, 96(4):273-282. https://doi.org/10.1016/j.prosdent.2006.08.006
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