High strength low heat cracking aluminium copper serial alloy welding wire, its preparation method and application

Abstract

A welding Al-Cu alloy wire for MIG welding and AC TIG welding contains Cu (5.5-6.5 Wt%), Mn (0.2-0.6), Ti (0.15-0.30), Zr (0.15-0.35), V (0.05-0.20), Ag (0.2-0.5), Si (0-0.1), Fe (0-0.15) and Al (rest). Its preparing process includes such steps as smelting in graphite crucible, refining, removing slag, dehydrogenating, casting, soaking, removing scale, extruding, drawing and scraping. Its advantages are high strength, high plasticity and high cracking resistance.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a high-strength and low-thermal-crack aluminum-copper alloy welding wire and its preparation method and application, which are mainly used for melting gas shielded welding (MIG) and alternating tungsten argon arc welding (TIG) for welding aluminum Copper-based high-strength aluminum alloy. Background technique [0002] Aluminum-copper alloys are precipitation-strengthened alloys, which can be strengthened by heat treatment. They have high room temperature strength and good high-temperature and ultra-low-temperature performance. They are widely used in aviation, aerospace and other military and civilian vehicles, such as: storage of space shuttles and launch vehicles. Fuel tanks for liquid hydrogen and liquid oxygen, structural parts for supersonic aircraft and automobiles, and armor for light combat vehicles. The recently developed howitzer mount also uses a large number of new ...

AI Technical Summary

Problems solved by technology

The weld structure of this kind of welding wire is composed of dendrites and coarse eutectics distributed along the grain boundaries. The strength of the weld metal is low. When welding 2219 and 2519 high-strength aluminum-copper alloys with it, the strength of the welded joint can only reach that of the base metal. About 55% to 60%, and the arc crater crack is more serious