Simulation of Heat Transfer and Recrystallization in Aluminum Alloy AA 6070 by TIG Welding Method
Subject Areas : WeldingMir Javad Mir Najd Gerami 1 , Eslam Ranjbarnodeh 2 , Mehdi Farajpour 3
1 - Department of Engineering, Islamic Azad University East Tehran Branch, Tehran, Iran
2 - Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
3 - Department of Engineering, Islamic Azad University East Tehran Branch, Tehran, Iran
Keywords: Finite element method, heat transfer, Recrystallization, TIG Welding, Aluminum 6070,
Abstract :
Aluminum alloys have many applications in transportation industry because of their abundance, ease of production, as well as proper mechanical and physical properties. One of these alloys is obtained by combining aluminum with silicon and magnesium (Al-Mg-Si alloys). Since the plates of this alloy are rolled up, heat transfer and crystallization in the heat-affected zone (HAZ) is an important point in their welding. In this study, we have attempted to investigate welding-induced recrystallization in this alloy using the finite element method. For this purpose, the physics of the problem was defined and simulated using ANSYS software. In the next step, the results of theoretical (simulated) and experimental investigations were compared and the effect of current on the size of weld pool and thermal cycle of different samples was assessed. Then, through microscopic examination of different areas of the welded samples, the size of recrystallized area was measured and compared with the results of mathematical calculations. Finally, the hardness of weld zone and recrystallized area was analyzed. A temperature of 630°C and holding time of about 0.3 seconds is sufficient for recrystallization of this alloy during welding.