Experimental Assessment by Finite Elements Method of the Residual Stress State and of the Heat Flow from the Laser Weldings of the Alloys of CoCrMo Used in RPD (Removable Partial Dentures) Technology

Abstract:

The welded joints are used in the technology of the removable partial dentures for the rehabilitation of their metal component. The welding procedure and the adequate equipment are established according to the components dimension, the quality of the alloys used and the dentures section. The modifications within the welded structures can be investigated by means of non-destructive tests such as the radiography or the analysis with finite elements. The work was based on the experimental checking of the optimal procedures of welded joint of the alloys of CoCrMo in order to increase their durability. The welded joints were performed in a butt joint configuration with addition of material on the alloys of CoCrMo used in the technology of the framed dentures. The finite elements method was used (software Solid works 2007) in order to simulate the welding process (thermal analysis) and to assess the residual stress areas appeared after the various welding procedures.

• Periodical: Key Engineering Materials (Volume 399)
• Pages: 185-191
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.399.185
• Online since: October 2008
• Authors: Cristina Bortun, Nicolae Faur, Anghel Cernescu, Liliana Sandu
• Keywords: Numerical Analysis with Finite Elements, Technology of Framed Removable Partial Dentures, Weld Joint

References

[1] Apotheker H, Nishimura I, Seerattan C. Laser welded vs soldered non precious alloy dental bridges: A comparative study. Lasers in surgery and medicine 1984; 4: 207-213.

DOI: 10.1002/lsm.1900040213

[2] Bertrand C. La soudure au laser : une technique d'avenir au laboratoire de prothèse. Arts et Technique Dentaires, 1995; 6: 363-368.

[3] Bortun, C., N. Faur, A. Cernescu, S. Porojan, O. Gomboş, L. Sandu, B. Ghiban: Finite Element Analysis For Stress Distribution In Welded Zones Used In RPD Technology, 14th Swiss Conference on Biomaterials, Basel, 8 mai (2008).

[4] Borţun Cristina, Mitelea I., Miloş L., Bîrdeanu V., Sandu Liliana: Analysis of laser welded joints on C alloy used in removable partial dentures technology, European Cells and Materials, vol. 10 Suppl 1, 2005, pg. 31. ISSN 1473-2262.

[5] Borţun Cristina., S. Porojan, L. Sandu, M. Iacob, B. Ghiban: Thermic Treatments For Some Welded CoCrMo Alloys Used In Removable Partial Dentures Tehnology Program and Abstracts Swiss Society for Biomaterials, 13th General Meeting, 9 may 2007, Neuchatel, Elveţia Europeean Cells and Materials vol 13. Suppl. 3. 2007 (pg. 32), ISSN 1473-2262.

[6] Brooks J A. Effect of alloy modifications on HAZ Cracking of A286 stainless Steel. Welding Journal 1974; November: 517s-523s.

[7] Cieslak M J, Stephens J J, Carr J J. A study of weldability and weld related microstructure of Cabot alloy 214. Metallurgical Transactions A 1988 19A: 657-67.

DOI: 10.1007/bf02649280

[8] Dobberstein H, Orlick H, Fisher P, Zhurt R. Experimental studies of the laser welding of Cr-Co alloys using a pulse laser 6d-Yag. Zahn, Mund, Und Kieferheilkunde Mit Zentralblatt 1989; 77: 578-579.

[9] Dobberstein H. Orlick H. Zuhrt R. The welding of cobalt-chromium, nickel-chromium and silver-palladium alloys using a solid state laser. - Zahn Mund, Und Kieferheilkunde Mit Zentralblatt 1990; 78: 259-61.

[10] Faur N: Elemente finite - fundamente, Ed. Politehnica, Timişoara, (2002).

[11] Frolov V A et al. Light beam welding thin sheets of titanium alloy. - Welding International 1994; 8: 41-42.

DOI: 10.1080/09507119409548541

[12] Hoffman J. Dental laser welding technique. Procedural report. 1. Quality, expense, and risks of innovative bonding technique. Dental labor 1992; 40 : 1221-4.

[13] Hoffmann J. Dental laser welding technique. Procedural report 2. Indications for use of innovative technique. Dental Labor 40: 1321-28.

[14] Kou Sindo: Welding Metallurgy, Second edition, Ed. Wiley Interscience, a John Wiley &Sons, Inc. Publication, (2002).

[15] Lindgren Laers-Erik: Computational welding mechanics, Thermomechanical and microstructural simulations, Woodhead Publishing Limited, (2007).

[16] Matsuda S, Veyama T. Solidification crack susceptibility of laser weld metal in 0. 2C-6i-Cr-Co steels: effects of bead configuration and S and P contents. Welding International 1993; 7: 686-92.

DOI: 10.1080/09507119309548473

[17] Ninh, N.T., M.A. Wahab, The effect of residual stresses and weld geometry on the improvement of fatigue life, J. Mater. Process. Technol. 48 (1995) 581-588.

DOI: 10.1016/0924-0136(94)01697-y

[18] Sandu Liliana, Cristina Borţun: Three Dimensional Finite Element Analysis of Thermal Stresses in the Cast Clasps, 12th International Dental Congress of the Egyptian Dental Clinical Society, march 22-24, 2006, Cairo, pg. 54.

[19] Sandu Liliana, V. Bîrdeanu, Cristina Borţun, F. Topală: Laser welding procedures applied to removable partial dentures frameworks repairs, European Cells and Materials, Vol. 11, Suppl. 2, 2006, pg. 29. ISSN 1473-2262.

[20] Sjogren G, Anderson M, Bergman M. Laser welding of titanium in dentistry. Acta Odontol Scand 1988; 46: 247-253.

[21] Van Benthem H. Advantages of laser welding compared to conventional joining. Quintessenz Der Zahntechnick 17: 1178-1193.

[22] Yajiang Li *, Wang Juan, Chen Maoai, Shen Xiaoqin: Finite element analysis of residual stress in the welded zone of a high strength steel. Bull. Mater. Sci., Vol. 27, No. 2, April 2004, pp.127-132. © Indian Academy of Sciences.

DOI: 10.1007/bf02708494

[23] Yang, Y.S., K. -J. Son, S. -K. Cho, S. -G. Hong, S. -K. Kim, K. -H. Mo, Effect of residual stress on fatigue strength of resistance spot weldment, Sci. Technol. Weld. Joi. 6 (2001) 397-401.

DOI: 10.1179/stw.2001.6.6.397