In order to check the feasibility of the FSC process for joining alclad AA2024-T3 sheets, the effects of each important processing parameter on the failure load, failure mode and fatigue life of FSC joints should be carefully examined.
Then the admissible processing parameters for FSC joints in alclad AA2024-T3 sheets will be obtained.
The other fatigue crack (crack 2) emanates from the left original crack tip and grows along the alclad layer.
Under these processing parameters, the average failure loads of FSC joints in lap-shear and cross-tension specimens of alclad AA2024-T3 sheets are 7523 N and 4220 N, respectively.
X., et al., "Microstructures and mechanical properties of friction spot welded Alclad 7B04-T74 aluminium alloy," Sci.
Materials characterization by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was performed using a JEOL-JSM-6000 operating at 15 kV in order to verify the Alclad 7075 cladding, core, and corrosion product elemental analysis (i.e., red corrosion product containing 7.71 mass% Cu).
Upon visual inspection of the Alclad medium scale test panel, shallow irregularly shaped corrosion patches are fairly evenly distributed over the panel surface.
Five distinct regions of corrosion behavior were observed: (1) The surface of the clad spots experienced general corrosion, where the Alclad layer was depleted as a sacrificial anode, protecting the overall panel surface.
Figure 3 shows one of the large corrosion patches distributed over the Alclad test panel surface.
From the visual observations and representative cross sections of the medium scale test panels, it is apparent that the cladding layer of the Alclad test panel successfully protected the high strength aluminum core from the corrosion environment.
From the tensile strength results, the partially clad test panel had the smallest reduction in tensile strength after corrosion exposure with a percent decrease of 3.4% while the Alclad and bare panels had percent decreases of 4.0% and 5.3%, respectively.
In this instance, the Alclad test panel outperformed the partially clad test panel but the partially clad panel performed much better than the bare panel.