Tensile Properties of Friction Stir Welded Joints of AA 2024-T6 Alloy at Different Welding Speeds

[摘要] The influence of welding speed on the friction stir welded joint properties of hardness, tensile properties, defects and microstructure characterization are studied in the present study. The friction stir welding was conducted on AA2014-T6 heat treated alloy with 5 mm thickness plate in butt joint configuration. The welding speed was varied from 8 mm/min to 120 mm/min at the fixed travel speed and load conditions. It is observed that the welding speeds at higher rate with wide range can be possible to weld this alloy at higher rates of tool revolution suggesting that the inherent capability of friction stir welding technique for aluminum 2014 alloys. The strength of the joints gradually increases with enhancing of welding speed. The micro structural observations exhibited the formation of equiaxed grains in the stir zone and slightly in the thermo-mechanically affected zone. In addition, the size of the grains decreases with increase in welding speed owing to the presence of low heat input. Hence the hardness of the joints slightly increased in the stir zones over the other zones of the weld nugget. The joint strength initially increases with the welding speed and starts to decreases after reaching to the maximum value. The relationship between the welding conditions and friction stir welded joint properties has been discussed.

[发布机构] Department of Mechanical Engineering, Government Polytechnic Rajampet, Andhra Pradesh; 516126, India^1;Department of Mechanical Engineering, Marri Laxman Reddy Institute of Technology and Management, Telangana; 500043, India^2;Department of Mechatronics Engineering, Kyungsung University, Busan; 48434, Korea, Republic of^3;Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand; 247667, India^4

[效力级别] 机械制造

[关键词] Equi-axed grains;Friction stir welded joints;Heat treated alloy;Low heat inputs;Micro-structural observations;Microstructure characterization;Thermomechanically affected zones;Welding conditions