Aluminum-magnesium alloy welding wire for gas shield welding of aluminum-alloy car body and preparation method thereof

Abstract

The invention discloses an aluminum-magnesium alloy welding wire for the gas shield welding of an aluminum-alloy car body and a preparation method thereof. The preparation method of the aluminum-magnesium alloy welding wire comprises the following steps: smelting and refining, continuously casting and rolling, drawing the wire and carrying out surface polishing treatment on the welding wire. The aluminum-magnesium alloy welding wire disclosed by the invention has the advantages of high performance and stable and good joint performance.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy gas shielded arc welding welding materials, and in particular relates to an aluminum-magnesium alloy welding wire used for gas shielded welding of aluminum alloy car bodies and a preparation method thereof. Background technique [0002] In recent years, with the adjustment of my country's automobile industry policy and the implementation of new energy policy and low-carbon environmental protection policy, as well as the development of high-speed and efficient transportation of rail vehicles, high-strength, high-toughness, corrosion-resistant aluminum alloys are used to replace steel, and thin-walled Complex section aluminum profiles and thin plate stamped aluminum structural parts have become the main way to realize the weight reduction of car bodies as car body materials. Since car body manufacturing is an industry in which welding is the leading process, the depth of development of aluminu...

AI Technical Summary

Problems solved by technology

The traditional aluminum-magnesium alloy welding wire has been finalized as early as the 1970s and has been used until now. Its chemical composition design is relatively simple. The trace alloy elements in the welding wire have not been fully utilized, and the mechanical, physical and chemical properties of the welding wire are not high, especially the process performance is even more backward.

Traditional aluminum-magnesium welding wire has a weak grain refinement effect, and cannot suppress the tendency of the welding wire, especially the weld metal grains, to be coarse, and the joint strength is generally low; the traditional aluminum-magnesium welding wire lacks the ability to automatically remove hydrogen, The ability of inclusions, the effect of purifying the grain interface is poor, and there are many impurities in the weld metal; the traditional aluminum-magnesium welding wire does not automatically reduce the surface tension of the molten metal, the fluidity is poor, and the weld crack tendency is large

The traditional aluminum-magnesium welding wire has poor fusion with the base metal, and is not suitable for the arc welding technology with low energy input, and the arc welding technology with low energy input is the key to solve all technical problems of traditional arc welding, such as out-of-tolerance deformation of the base metal, thermal influence The strength of the zone is too low, there are too many defects such as cracks, pores, and inclusions, and the amount of metal evaporation and dust generation is too large.