A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Maran, P.
- Numerical studies on convection in GTA Weld Pool
Authors
1 Department of Mechanical Engineering, Thiagarajar College of Engineering, Madurai, IN
2 Department of Mechanical Engineering, Indian Institute of Technology, Madras, Chennai, IN
Source
Indian Welding Journal, Vol 41, No 2 (2008), Pagination: 42-47Abstract
Weld pool convection strongly influences the behaviour of molten metal in the melt pool during fusion welding of metals. The temperature and velocity fields in the melt pool are largely affected by different driving forces causing weld pool convection. Variations in the heat input during welding have significant effects on the peak temperature, maximum velocity in the melt pool and weld bead geometry. Buoyancy, electromagnetic and surface tension are the major driving forces. In the present work, the effects of weld pool convection on weld bead geometry of stainless steel during Gas Tungsten Arc (GTA) welding have been studied for individual and combined driving forces. A two dimensional finite volume model has been used to simulate the welding process. The model uses a modified Gaussian heat distribution to provide the three dimensional effect of linear welding.
Keywords
Modeling, Weld Pool, Fluid Flow, GTA Welding, Stainless Steel, Weld Bead Geometry.- Microstructure and Hardness in GTA Welding of Stainless Steel
Authors
1 Department of Mechanical Engineering, Thiagarajar College of Engineering, Madurai-625015, IN
2 Department of Mechanical Engineering, Indian Institute of Technology, Madras, Chennai-600036, IN
Source
Indian Welding Journal, Vol 41, No 4 (2008), Pagination: 32-37Abstract
The experimental studies on microstructures and micro hardness in the weld metal show that the fluid flow pattern in the weld pool strongly influences the cooling rate, microstructure and hardness. The fluid pattern predicted is correlated with the experimental results for microstructures and hardness. The spatial variations of micro hardness show that the micro hardness values are higher in the low velocity fluid flow region and lower in the remaining region. The variations are due to different cooling rates, micro structures, sizes of the grains and delta ferrite content.