Fig. 3 — Macrostructure and microhardness of Aural2T7 to Aural2T7 spot weld: A — Aswelded sample for welding schedule 1; B — aswelded sample for welding schedule 2. Fig. 4 — Macrostructure and microhardness of Aural2T7 to AA5754O spot weld: A — Aswelded sample; B — baked sample. A B microhardness change was seen in the AA5754-O, Aural-2-T7 sides before and after the e-coat. However, in the Aural-2-T7 to AA6022-T4 spot welds shown in Fig. 5, an increase of 10 Hv is observed after the e-coat at a spot 6 mm away from the center of the weld nugget. This is the area of interest chosen for the shear test of the HAZ. Shear angle measurements from the shear tests of the three types of dissimilar aluminum alloy spot welds under as-welded and baked conditions WELDING RESEARCH were all obtained in-situ during the shear tests. For the sake of simplicity, only the shear angle maps at maximum load for the weld nuggets and HAZ in the as-welded condition are shown in Figs. 6 and 7. Based on these measurements, the shear strains over JULY 2016 / WELDING JOURNAL 251-s A B A B Fig. 5 — Macrostructure and microhardness of Aural2T7 to AA6022T4 spot weld: A — Aswelded sample; B — baked sample.
Welding Journal | July 2016
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