title: Effect of plasma welding parameters on the flexural strength of Ti-6Al-4V alloy.
abstract: The aim of this study was to assess the effect of different plasma arc welding parameters on the flexural strength of titanium alloy beams (Ti-6Al-4V). Forty Ti-6Al-4V and 10 NiCr alloy beam specimens (40 mm long and 3.18 mm diameter) were prepared and divided into 5 groups (n=10). The titanium alloy beams for the control group were not sectioned or subjected to welding. Groups PL10, PL12, and PL14 contained titanium beams sectioned and welded at current 3 A for 10, 12 or 14 ms, respectively. Group NCB consisted of NiCr alloy beams welded using conventional torch brazing. After, the beams were subjected to a three-point bending test and the values obtained were analyzed to assess the flexural strength (MPa). Statistical analysis was carried out by one-way ANOVA and Tukey's HSD test at 0.05 confidence level. Significant difference was verified among the evaluated groups (p<0.001), with higher flexural strength for the control group (p<0.05). No significant differences was observed among the plasma welded groups (p>0.05). The NCB group showed the lowest flexural strength, although it was statistically similar to the PL 14 group (p>0.05). The weld depth penetration was not significantly different among the plasma welded groups (p=0.05). Three representative specimens were randomly selected to be evaluated under scanning electron microcopy. The composition of the welded regions was analyzed by energy dispersive X-ray spectroscopy. This study provides an initial set of parameters supporting the use of plasma welding during fabrication of titanium alloy dental frameworks.
authors: Department of Occlusion, Fixed Prosthodontics and Dental Materials, Dental School, UFU - Universidade Federal de Uberlândia, Uberlândia, MG, Brazil. joaodf22@hotmail.com
authors: João Paulo
authors: JP
authors: Lyra e Silva
authors: Alfredo Júlio
authors: AJ
authors: Fernandes Neto
authors: Luís Henrique Araújo
authors: LH
authors: Raposo
authors: Veridiana Resende
authors: VR
authors: Novais
authors: Cleudmar Amaral
authors: CA
authors: de Araujo
authors: Luisa de Andrade Lima
authors: Lde A
authors: Cavalcante
authors: Paulo Cezar
authors: PC
authors: Simamoto Júnior
mesh_terms: D000497:Alloys; D001128:Argon / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D012994:Dental Soldering / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D058626:Plasma Gases / Q000737:chemistry*; D018583:Pliability; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014896:Welding / Q000295:instrumentation / Q000379:methods
chemical_list: D000497:Alloys; D002858:Chromium Alloys; D003722:Dental Alloys; D058626:Plasma Gases; C031462:titanium alloy (TiAl6V4); D001128:Argon; D014025:Titanium