Composition differs from standard 5083 and 5383 mainly in terms of higher Mg-content, higher Mn-content, higher Zn-content, and defined Zr-content. The increased Mg-content in the Alustar alloy increases the strength after welding. Together with an increased Mn-content, a higher Mg-content enhances the ductility. To compensate for the deterioration in corrosion resistance caused by the higher Mg-content, an optimal amount of Zn is required. By precipitating Mg-Zn-containing phases in the Al matrix, potential differences between the grain boundaries and grain interiors are eliminated. Zr additions to Alustar alloy cause the formation of a finer grained heat affected zone which leads to a stronger bond in the fusion zone. The effect of Zr is the same in welding wires. Therefore, in addition to the standard filler alloys such as AA5183, Zr-containing filler wires (such as AA 5087) can also be used to weld Alustar alloy plates.