Optimization of friction stir welding parameters for improved corrosion resistance of AA2219 aluminum alloy joints  

作　　者：G.RAMBABU D.BALAJI NAIK C.H.VENKATA RAO K.SRINIVASA RAO G.MADHUSUDAN REDDY 

机构地区：[1]Department of Mechanical Engineering,Andhra University [2]Department of Metallurgical Engineering,Andhra University [3]Defence Metallurgical Research Laboratory

出　　处：《Defence Technology（防务技术）》2015年第4期330-337,共8页Defence Technology

摘　　要：The aluminium alloy AA2219(Al—Cu—Mg alloy) is widely used in the fabrication of lightweight structures with high strength-to-weight ratio and good corrosion resistance.Welding is main fabrication method of AA2219 alloy for manufacturing various engineering components.Friction stir welding(FSW) is a recently developed solid state welding process to overcome the problems encountered in fusion welding.This process uses a non-consumable tool to generate frictional heat on the abutting surfaces.The welding parameters,such as tool pin profile,rotational speed,welding speed and axial force,play major role in determining the microstructure and corrosion resistance of welded joint.The main objective of this work is to develop a mathematical model to predict the corrosion resistance of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters.In this work a central composite design with four factors and five levels has been used to minimize the experimental conditions.Dynamic polarization testing was carried out to determine critical pitting potential in millivolt,which is a criteria for measuring corrosion resistance and the data was used in model.Further the response surface method(RSM) was used to develop the model.The developed mathematical model was optimized using the simulated annealing algorithm optimizing technique to maximize the corrosion resistance of the friction stir welded AA2219 aluminium alloy joints.The aluminium alloy AA2219 （Al-Cu--Mg alloy） is widely used in the fabrication of lightweight structures with high strength-to-weight ratio and good corrosion resistance. Welding is main fabrication method of AA2219 alloy for manufacturing various engineering compo- nents. Friction stir welding （FSW） is a recently developed solid state welding process to overcome the problems encountered in fusion welding. This process uses a non-consumable tool to generate frictional heat on the abutting surfaces. The welding parameters, such as tool pin profile, rotational speed, welding speed and axial force, play major role in determining the microstructure and corrosion resistance of welded joint. The main objective of this work is to develop a mathematical model to predict the corrosion resistance of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters. In this work a central composite design with four factors and five levels has been used to minimize the experimental conditions. Dynamic polarization testing was carried out to determine critical pitting potential in millivolt, which is a criteria for measuring corrosion resistance and the data was used in model. Further the response surface method （RSM） was used to develop the model. The developed mathematical model was optimized using the simulated annealing algorithm optimizing technique to maximize the corrosion resistance of the friction stir welded AA2219 aluminium alloy joints.

关 键 词：2219铝合金 耐腐蚀性能 搅拌摩擦焊 焊接接头 参数优化 数学模型 摩擦搅拌焊接 模拟退火算法 

分 类 号：TG453.9[金属学及工艺—焊接] V261.34[航空宇航科学与技术—航空宇航制造工程]