Al-Mg-Zn aluminum alloy welding wire and preparation method thereof

Abstract

The invention relates to an Al-Mg-Zn aluminum alloy welding wire and a preparation method thereof, and belongs to the technical field of aluminum alloy welding wires. The Al-Mg-Zn aluminum alloy welding wire is prepared from the components in percentage by mass: 0.5 to 3.0 percent of Zn, 4.5 to 5.5 percent of Mg, 0.05 to 0.20 percent of Mn, less than or equal to 0.15 percent of Ti, less than or equal to 0.15 percent of Cr, less than or equal to 0.25 percent of Fe, less than or equal to 0.25 percent of Si, less than or equal to 0.15 percent of the total amount of other impurity elements, less than or equal to 0.05 percent of the content of single impurity element, and the balance Al. The preparation method comprises the steps of smelting, casting, heating to 440 DEG C to 470 DEG C, keepingwarm for 3h to 6h, carrying out hot extrusion, heating to 480 DEG C to 550 DEG C, keeping arm for 3h to 6h, rolling, intermediate annealing, scaling, and multi-pass drawing. According to the method, high-temperature long-time homogenization treatment is not needed, so that the energy is saved, and the welding wire production process is shortened; and excess crystal phase particles in the welding wire are fine in size and uniform in dispersion and distribution, so that wire breakage caused by drawing is reduced, the welding wire yield is improved, the production cost is reduced, and a welding performance and the weld seam metal strength of the welding wire can be improved.

Description

Technical field [0001] The invention belongs to the technical field of aluminum alloy welding wire, and specifically relates to an Al-Mg-Zn aluminum alloy welding wire and a preparation method thereof. Background technique [0002] With the development of society and economy, the rapid development of safe, environmentally friendly, and comfortable rail train transportation, the application of aluminum alloy in high-speed train bodies has become a research focus in countries around the world. Since vehicles are usually made of large aluminum profiles and aluminum plates, the application of welding technology in car body manufacturing will greatly shorten the production cycle. Take a high-speed train as an example. The car body is a welding member with a large, flat, wide and thin-walled aluminum alloy profile as the framework. The welding can reduce the workload of vehicle manufacturing by 40%. The welding method of aluminum alloy can be divided into: molten extremely inert gas pr...

AI Technical Summary

Problems solved by technology

Among them, the homogenization process is the most energy-consuming and time-consuming link in the production process of high-quality welding wire except alloy melting. It is worth noting that the spheroidization and growth of excess crystal phases will also occur during the homogenization process, which is not conducive to subsequent Hot deformation and cold deformation processing will also affect the arc stability during welding and the microstructure and performance of welded joints

Images