title: Fatigue performance of joints executed in pure titanium structures with several diameters.
abstract: This study evaluated fatigue strength of CP-Ti laser-welded joints. Sixty (20/diameter) CP-Ti casted dumbbell rods with diameters of 1.5, 2.0, and 3.5 mm were sectioned and welded using two joint openings (0.0 (00) and 0.6 mm (06)). Six groups were formed, amounting to a total of 9 (n=10) with inclusion of intact groups. Welding was executed using 360 V/8 ms (1.5 and 2.0 mm) and 380 V/9 ms (3.5 mm). Joints were finished, polished, and submitted to radiographic examination to visually analyze presence of porosity (PP). Specimens were submitted to cyclic tests, and the number of cycles until failure (NC) was recorded. Fractured surfaces were examined by SEM. Kruskal-Wallis and Dunn (α=0.05) tests demonstrated that NC was lower for all diameters with 06, and for 3.5 mm/00. NC and PP were found to have a negative correlation (Spearman Coefficient). For CP-Ti frameworks with thin diameters, laser welding is better when structures are juxtaposed.
authors: Department of Prosthodontics and Periodontology, Piracicaba Dental School.
authors: Juliana Maria Costa
authors: JM
authors: Nuñez-Pantoja
authors: Luis Geraldo
authors: LG
authors: Vaz
authors: Mauro Antônio de Arruda
authors: MA
authors: Nóbilo
authors: Marcelo Ferraz
authors: MF
authors: Mesquita
mesh_terms: D003722:Dental Alloys / Q000737:chemistry*; D003799:Dental Stress Analysis; D008422:Materials Testing; D016062:Porosity; D013314:Stress, Mechanical; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*; D014896:Welding
chemical_list: D003722:Dental Alloys; D014025:Titanium