R. Tamasgavabari, A. Ebrahimi, S. M. Abbasi, A. Yazdipour ,
Volume 5, Issue 1 (9-2019)
Abstract
In this research, the effect of vibration at the resonant range (75 Hz) on the hardness and tensile strength of AA-5083-H321 aluminum alloy, were welded by gas metal arc welding (GMAW) investigated. Vibration forces were ranged from 850 N to 2200 N, under identical welding parameters. Tensile strength and hardness testing of welded samples were performed. After mechanical tests, the fracture surfaces of welds were examined using scanning electron microscope (SEM) and discussed. The results showed that with increasing vibration force, the tensile strength and fracture strength of the specimens were welded during vibration, were increased by about 3 and 9 percent, respectively, compared to the non-vibrated weld sample. However, no significant change was observed in the hardness of the welded specimens. Mean grains size and heat affected zone of the sample was welded was welded with conventional GMAW, were about 200 μm and 1800 μm, but due to inducing vibration, as vibration force increased from 850 N to N 2200 N, Mean grains size was reduced to about 75 μm and HAZ was reduced from about 1000 μm to 700 μm, that is, about 44 to 61%.
Mohammad Reza Borhani, Reza Shoja Razavi, Farid Kermani,
Volume 9, Issue 2 (8-2024)
Abstract
In this study, the effect of friction stir welding (FSW) parameters on the dissimilar joint properties of 5083 aluminum alloys and 316L austenitic stainless steel, with a thickness of 4 mm, has been investigated. The tool speed was considered in the range of 16 to 25 mm/min, and the rotation of tool speed was considered to be equal to a constant speed of 250 rpm. To check the microstructure of different weld areas, optical and scanning electron microscopes were used, to check the mechanical properties, hardness and tensile tests were performed. The results showed the formation of a composite region consisting of steel reinforcement particles in the field of aluminum.
At the steel-aluminum interface, a single layer of discontinuous intermetallic composition with a thickness of about 2 micrometers was observed; Also, by choosing the rotation speed of 250 rpm and the tool speed of 16 mm/min, the tensile strength equal to 298 MPa and ductility of 26% (93% of tensile strength and 50% of ductility of aluminum 5083 alloy) were obtained.
