补焊对7050-T7451高强铝合金搅拌摩擦焊接头组织与性能的影响

doi:10.11896/cldb.24040146

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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.

Key words： 7050-T7451 aluminum alloy friction stir welding repair welding microstructure mechanical property

Published: 25 May 2025 Online: 2025-05-13

CLC number:

TG453.9

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	Articles by authors
	ZHANG Bingxian
	CHEN Suming
	HE Wei
	NIU Pengliang
	HUANG Chunping

Cite this article:

ZHANG Bingxian,CHEN Suming,HE Wei, et al. Effect of Repair Welding on the Microstructure and Mechanical Properties of Friction Stir Welded 7050-T7451 Aluminum Alloy Joints[J]. Materials Reports, 2025, 39(10): 24040146-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24040146 OR https://www.mater-rep.com/EN/Y2025/V39/I10/24040146

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