Mechanical properties of friction stir welded armor grade Al-Zn-Mg alloy joints
(1. Rustamji Institute of Technology, BSF Academy, Tekanpur, Gwalior, Madhyapradesh 475005, India;
2. Mechanical Engineering Department, National Institute of Technology Patna, Patna 800005, India;
3. Mechanical and Industrial Engineering Department, I.I.T. Roorkee, Uttarkhand 247667, India)
2. Mechanical Engineering Department, National Institute of Technology Patna, Patna 800005, India;
3. Mechanical and Industrial Engineering Department, I.I.T. Roorkee, Uttarkhand 247667, India)
Abstract: The influence of different welding speeds and rotary speeds on the formation and mechanical properties of friction stir weld joints of armor grade aluminum alloy was presented. The developed weld joints were characterized by bend tests, micro-hardness tests, tensile tests, optical and scanning electron microscopies. Mechanical properties (i.e., micro-hardness, ultimate tensile strength and elongation to fracture) increased with the increase in rotary speed or decrease in welding speed. The effect of welding speed on micro-hardness of heat affected zones was more profound than the rotary speeds. The welding speeds and rotary speeds influenced the mechanical properties and their effects on various mechanical properties of the friction stir welded joints can be predicted with the help of regression models.
Key words: friction stir welding; welding parameters; mechanical properties; fractography; regression modeling