Table 1: Nominal chemical composition of materials used (wt.%).

Si Fe Cu Mn Mg Cr Zn Ti Al 6061 0.4–0.8 0.7 0.15–0.4 0.15 0.8–1.2 0.10 0.25 0.15 Balance 4043 4.5–6.0 <0.8 0.30 0.05 0.05 — 0.10 <0.02 Balance