Tensile and flexural strength of commercially pure titanium submitted to laser and tungsten inert gas welds.
This study evaluated the tensile and flexural strength of tungsten inert gas (TIG) welds in specimens made of commercially pure titanium (CP Ti) compared with laser welds. Sixty cylindrical specimens (2 mm diameter x 55 mm thick) were randomly assigned to 3 groups for each test (n=10): no welding (control), TIG welding (10 V, 36 A, 8 s) and Nd:YAG laser welding (380 V, 8 ms). The specimens were radiographed and subjected to tensile and flexural strength tests at a crosshead speed of 1.0 mm/min using a load cell of 500 kgf applied on the welded interface or at the middle point of the non-welded specimens. Tensile strength data were analyzed by ANOVA and Tukey's test, and flexural strength data by the Kruskal-Wallis test (α=0.05). Non-welded specimens presented significantly higher tensile strength (control=605.84 ± 19.83) (p=0.015) and flexural strength (control=1908.75) (p=0.000) than TIG- and laser-welded ones. There were no significant differences (p>0.05) between the welding types for neither the tensile strength test (TIG=514.90 ± 37.76; laser=515.85 ± 62.07) nor the flexural strength test (TIG=1559.66; laser=1621.64). As far as tensile and flexural strengths are concerned, TIG was similar to laser and could be suitable to replace laser welding in implant-supported rehabilitations.
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Juliana Abdallah
JA
Atoui
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Daniela Nair Borges
DN
Felipucci
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Valéria Oliveira
VO
Pagnano
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Iara Augusta
IA
Orsi
Department of Prosthodontics and Periodontics, Piracicaba School of Dentistry, UNICAMP - University of Campinas, PiracicabaSP, Brazil.
Mauro Antônio de Arruda
MA
Nóbilo
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Osvaldo Luiz
OL
Bezzon
D007834:Lasers; D016062:Porosity; D033081:Shear Strength; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D014414:Tungsten; D014896:Welding / Q000379:methods*
D014025:Titanium; D014414:Tungsten