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Showing 3 results for Alavi zaree
Optimization of pulesd current gas tungsten arc welding process parameters to attain maximum weld metal toughness ofAISI 316/A387 Gr.91 weld joints with Taguchi method
Mohammad Jula, Reza Dehmolaei, Seyed Reza Alavi Zaree,
Volume 2, Issue 2 (Journal OF Welding Science and Technology of Iran 2016)
Abstract

In this paper, maximum value of energy to break at Charpy impact test as a criterion of fracture toughness of AISI 316/A387 Gr.91 weld joints with ERNiCrMo-3 filler metal were obtained by optimization of pulesd current gas tungsten arc welding process parameters. The selected parameters were peak current, background current, frequency and on time percentage that were changed in three levels. Therefore a L9 orthogonal array of Taguchi design including nine experiments for four parameters with three levels (34) was used. Analysis of signal to noise (S/N) ratio indicated that optimized values of peak current, background current, frequency and on time percentage were 120A, 90A, 10Hz and 80%, respectively. The welded specimen with optimized parameters showed an energy to break at Charpy impact test value of 65J at -20°c. The obtained results also demonstrated that the most influence on energy to break values belonged to background current, frequency, peak current and on time percentage, respectively. 


Investigation of the effect of heat input on the properties of HSLA 100 steel weld joints produced by SMAW process
Mehdi Asle Taghipour, Reza Dehmolaei, Seyed Reza Alavi Zaree, Mohammad Reza Tavakoli Shoushtari,
Volume 7, Issue 1 (Journal OF Welding Science and Technology 2021)
Abstract
The microstructure and mechanical properties of HSLA-100 steel weld joints was investigated. Welding with three heat input of 0.820, 1.176 and 1.392 kJ / mm was performed using E12018 electrode. Microstructural studies were performed using scanning electron and optical microscopes. The mechanical properties of welded joints were evaluated by impact and microhardness tests. Microstructural studies showed that with increasing the heat input, the amount of acicular ferrite in the weld metal decreased and the amount of polyhedral and quasi-polygonal ferrite increased. It was found that with increasing the heat input, the amount of layered bainite in the heat affected zone increased and the amount of granular bainite decreased. Due to the decrease in the amount of acicular ferrite in the weld metal microstructure with increasing inlet temperature, the amount of hardness and impact energy decreased. The results showed that the increase in heat input due to the reduction of the acicular ferrite of the weld metal and the dissolution of precipitates in the coarse grain heat affected zone has caused a decrease in hardness in these zones. It was found that with increasing the heat input due to decreasing the acicular ferrite, the impact energy of the weld metal decreased by 29% (from 45 joules at an heat input of 0.82 to 32 joules at an heat input of 1.392 kJ / mm). It was found that at all heat inputs, the impact energy of the base metal is greater than the impact energy of the weld metal.
 

Effect of diffusion bonding temperature on microstructure properties of Zr/Ti interlayer in the diffusion bonded joints of Zr702 to A516 steel
A. Pourjafar, R. Dehmolaei, R. Alavi Zaree, Kh. Ranjbar, M.r. Tavakoli Shoushtari,
Volume 8, Issue 2 (Journal OF Welding Science and Technology 2023)
Abstract
In this study, the effect of temperature on the microstructure and reactive layer at the interface between the Ti interlayer and the base metal related to the diffusion bonding of Zr702 to A516 low alloy steel was investigated. The joining was done using the spark plasma sintering technique at temperatures of 900, 950 and 1000°C for 30 minutes. Field Emission Scanning Electron Microscope (FESEM) equipped with EDS analysis was used to investigate the microstructure of the interfaces in various joints. Investigations showed that at all temperatures, with the diffusion of atoms and the formation of a reactive layer between the Ti interlayer and Zr702, no intermetallic phases, cracks, porosity and discontinuities were formed at their interfaces. . It was found that increasing the bonding temperature did not cause the formation of new phases and compounds in the interface and only increased the thickness of the reaction layer. The measurement of the thickness of the reactive layer showed that the maximum and minimum amounts of diffusion were 84 microns at 1000 °C and 64 microns at 900 °C respectively

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