The invention relates to the technical field of
metal material preparation, and particularly discloses a high-strength Al-Si
alloy welding wire and a preparation method thereof. The method comprises the following steps that an Al-Ti-B intermediate
alloy with TiB2 particles in-situ generated is subjected to violent plastic deformation to obtain the Al-Ti-B intermediate
alloy containing the nano TiB2 particles, wherein the size of the nano TiB2 particles ranges from 50 nm to 1000 nm; the Al-Ti-B intermediate alloy containing the nano TiB2 particles is used as a matrix
raw material, and an Al-Scintermediate alloy and an Al-Si intermediate alloy are added for
smelting treatment to obtain an alloy melt; the alloy melt is prepared into a wire blank with the
diameter of 8-10 mm; and hot rolling,cold drawing, intermediate annealing and surface treatment processes are carried out on the wire blank to obtain the aluminum-
silicon alloy
welding wire with the nano-scale TiB2 particles. Accordingto the aluminum-
silicon alloy
welding wire prepared through the method, the
mechanical property of a welding seam is remarkably improved while the original excellent welding mobility and the low welding crack sensitivity are inherited, the aluminum-
silicon alloy welding wire can be used for welding high-strength and ultrahigh-strength aluminum alloys, is especially suitable for alloys which are high in welding crack sensitivity (such as a 7000 series aluminum alloy) and the field which has high requirements on the welding strength, and has high industrial application value.