Evaluation of X-shaped welded joints with Co-Cr alloy under different welding parameters: analysis by micro-CT and flexural strength

Authors

DOI:

https://doi.org/10.33448/rsd-v10i4.14308

Keywords:

Dental Alloys; Dental Soldering; Flexural strength.

Abstract

This 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.

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Published

17/04/2021

How to Cite

SILVERIO, M. G. de C.; RAPOSO, L. H. A.; LOPES, R. T.; SIMAMOTO JÚNIOR, P. C. . Evaluation of X-shaped welded joints with Co-Cr alloy under different welding parameters: analysis by micro-CT and flexural strength. Research, Society and Development, [S. l.], v. 10, n. 4, p. e44510414308, 2021. DOI: 10.33448/rsd-v10i4.14308. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/14308. Acesso em: 8 may. 2021.

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Section

Health Sciences