Studies on post weld heat treatment of dissimilar aluminum alloys by laser beam welding technique

[摘要] The present study mainly focuses on post weld heat treatment (PWHT) of AA5083 and AA6061 alloys by joining these using laser beam welding at three different laser power and two different beam spot sizes and three different welding speeds. Effects of these parameters on microstructural and mechanical properties like hardness, tensile strength were studied at PWHT condition and significant changes had been observed. The PWHT used was artificial aging technique. The microstructural observations revealed that there was a appreciable changes were taken place in the grain size. The microhardness observations proven that the change in the hardness profile in AA6061 was appreciable than in the AA5083. The tensile strength of 246 MPa was recorded as highest. The fractured surfaces observed are predominantly ductile in nature.

[发布机构] Department of Mechanical Engineering, MVGR College of Engineering, Andhra Pradesh; 535005, India^1;Department of Mechatronics Engineering, Kyungsung University, Busan; 48434, Korea, Republic of^2;Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology Tiruchirappalli, Tamil Nadu; 620015, India^3;Department of Metallurgical and Materials Engineering, National Institute of Technology Tiruchirappalli, Tamil Nadu; 620015, India^4

[效力级别] 机械制造

[关键词] Artificial aging;Beam spot size;Dissimilar aluminum alloy;Fractured surfaces;Hardness profiles;Micro-structural;Micro-structural observations;Post weld heat treatment