High-strength Al-Si alloy welding wire and preparation method thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a high-strength Al-Si alloy welding wire and a preparation method thereof. Background technique [0002] Aluminum alloy has good electrical and thermal conductivity, high strength-to-mass ratio, corrosion resistance and damage resistance, and is widely used in aerospace, rail transit, automobiles, ships, pressure vessels, electronic appliances, furniture and many other fields , is one of the most widely used metal materials in industry. Inert gas shielded fusion welding (MIG welding and TIG welding) is a basic way to realize the connection of aluminum alloy structural materials, and it is also the most common connection method used in industrial aluminum alloy materials today, that is, under the protection of inert gas, through The arc melts the filler wire to join two aluminum alloy workpieces. [0003] At present, the most widely used aluminum alloy welding...

AI Technical Summary

Problems solved by technology

4000 series Al-Si alloy welding wire has good welding fluidity and low welding crack sensitivity, but the strength after welding is low, and it is usually used in areas where welding strength is not required

[0004] Therefore, aiming at the above-mentioned problem that low welding crack sensitivity and high post-weld strength cannot be taken into account at the same time, this application has developed a new type of high-strength aluminum with excellent comprehensive properties such as high post-weld strength, good welding fluidity and low thermal crack sensitivity. Silicon alloy welding wire and its preparation method

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