Abstract
The 7A04-T6 aluminum (Al) alloys were bonded via a friction stir welding (FSW) technique. The tensile strength of this FSW joint was the highest when the welding speed was 120 mm/min and the rotation speed was 1000 r/min, which reached 77.93 % of that of the base material (BM). The nugget zone (NZ) consisted mainly of the fine grains; the grain boundary misorientation angle in NZ was about 15°, indicating that the propagation of micro-crack was hindered to a certain degree, improving the toughness of this joint. The S-N curve of this joint showed that the fatigue strength decreased with an enhancement of the fatigue life when N was below 105, also N was above 106. The fatigue limit (141 MPa) of the joint was calculated through an up-and-down test method, the fatigue fracture position occurred in HAZ, exhibiting the ductile fracture. Then a laser local heat treatment (LLHT) process was carried out on this weld seam, which refined the microstructure, strengthening the mechanical property of this FSW joint.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
