Abstract: A method of producing aluminum alloy material having a thermal bonding function in a single layer and including 2.00 mass % to 3.00 mass % Si, 0.01 mass % to 0.50 mass % Fe, and 0.80 mass % to 1.50 mass % Mn includes a casting process performing a twin roll type casting to form a plate having a thickness of 3 mm to 12 mm by rotating a roll having a diameter D (mm) at peripheral velocity v (mm/min) being satisfying a following formula of 0.057×v+0.0016×D?33.54.

Abstract: During edgewise bending that is carried out on an aluminum alloy bus bar made of an aluminum alloy rectangular wire, an edgewise bending portion is heated to a temperature between 100 and 250° C. inclusive, and within 5 minutes after the heating, edgewise bending is carried out. In the aluminum alloy bus bar, the ratio A/B of Vickers hardness A in a heated portion to Vickers hardness B in a non-heated portion is at least 0.8. If necessary, flatwise bending is further carried out on the aluminum alloy bus bar, forming the bus bar into a predetermined shape.

Abstract: During edgewise bending that is carried out on an aluminum alloy bus bar made of an aluminum alloy rectangular wire, an edgewise bending portion is heated to a temperature between 100 and 250° C. inclusive, and within 5 minutes after the heating, edgewise bending is carried out. In the aluminum alloy bus bar, the ratio A/B of Vickers hardness A in a heated portion to Vickers hardness B in a non-heated portion is at least 0.8. If necessary, flatwise bending is further carried out on the aluminum alloy bus bar, forming the bus bar into a predetermined shape.