Artículos de revistas
Mechanical and fatigue strength assessment of friction stir welded plates of magnesium alloy AZ31B
Avaliação da resistência mecânica e à fadiga de chapas soldadas por atrito com pino não consumível da liga de magnésio AZ31B
Fecha
2018-01-01Registro en:
Soldagem e Inspecao, v. 23, n. 1, p. 52-59, 2018.
1980-6973
0104-9224
10.1590/0104-9224/SI2301.06
S0104-92242018000100052
2-s2.0-85053275088
S0104-92242018000100052.pdf
Autor
Servicio Nacional de Aprendizaje – SENA
Escuela de Ingeniería de Materiales
Laboratório Nacional de Nanotecnologia – LNNano
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Light-alloys play a significant role in saving weight in automotive and aerospace industries; however, a few joining methods guarantee mechanical and fatigue strengths for high performance application. Even conventional arc welding processes do not offer constant quality joints. Therefore, this study uses an alternative solid-state welding process, friction stir welding (FSW), to analyze post processing microstructures and assess mechanical and fatigue strength. Magnesium alloy AZ31B plates were welded using different welding parameters in a dedicated FSW machine. The effect of the spindle speed (ω) and welding speed (ν) on the microstructure, the tensile strength and fatigue were studied. The stirred zone (SZ) at the FS-welded joints presented a microstructure composed by homogeneous equiaxial grains, refined by dynamic recrystallization. A rise in grain size, weld bead width, tensile and fatigue strengths with the increase of speed ratio (ω/ν) were observed. Results of the fatigue and mechanical strength here presented outperformed results from welds made with conventional milling machines.