Effect of Repair Welding on the Microstructure and Mechanical Properties of Friction Stir Welded 7050-T7451 Aluminum Alloy Joints
ZHANG Bingxian1, CHEN Suming1, HE Wei3, NIU Pengliang2,*, HUANG Chunping4
1 Avic Xi’an Aircraft Industry Group Company. Ltd, Xi’an 710089, China 2 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China 3 First Military Representative Office of Air Force Equipment Department in Xi’an Region, Xi’an 710089, China 4 Graduate School of Chinese Aeronautical Establishment, Yangzhou 225111, Jiangsu, China
Abstract: In order to eliminate the micro-voids in the stir zone of friction stir welded 7050-T7451 aluminum alloy, 1 to 4 times of repair welding with optimized friction stir welding parameters were conducted to repair the stir zone. The repairing parameters are tool rotational rate 600 r/min, welding speed 150 mm/min. The optical microscope, scanning electron microscope, differential scanning calorimeter, microhardness tests and tensile tests at room temperature were utilized to characterize the macro/microstructure, tensile properties and fracture behavior of the repaired joints. Results indicate that sound joints without inner flaws can be obtained. The width of stir zone was increases with the increase of repairing times. The size of second phase particles decreases and homogeneously distributes after repairing. After two times repairing, the joint has the hig-hest tensile properties with tensile strength of 520 MPa and elongation of 8.2%, which are 25 MPa and 46.4% higher than those of the as-welded joint. The fracture location of joint altered from the stir zone to the heat affected zone on the retreating side when four times repairing was conducted.
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2025, Vol. 39 
