Composite zinc-aluminum flux cored wire containing beryllium and magnesium and rubidium salt and preparation method of flux cored wire

Abstract

The invention discloses a composite zinc-aluminum flux cored wire containing beryllium and magnesium and rubidium salt. The composite zinc-aluminum flux cored wire comprises a wire body consisting of an outer metal skin and core brazing flux powder, wherein the outer metal skin is prepared by the following raw materials by weight percent: 80.5 to 98.5% of zinc, 0.01 to 6.5% of silver, 0.01 to 3% of copper, 0.001 to 2% of nickel, 0.001 to 0.5% of beryllium, 0.001 to 1.2% of magnesium, 0.001 to 0.5% of rare earth element and the balance of aluminum; and the brazing flux powder is prepared by the following raw materials by weight percent: 15 to 35% of aluminum fluoride, 30 to 75% of cesium fluoride, 2.5 to 10% of rubidium fluoride, and the balance of potassium fluoride. The invention also provides a preparation method of the composite zinc-aluminum flux cored wire. The preparation method has the advantages that trace Be and Mg are introduced based on the conventional Zn-Al-Ag-Cu alloy system in the brazing filed, so that the cleanness of the wire can be improved, the quality and the reliability of a brazing joint are ensured, and the intercrystalline corrosion resistance of the wire can be greatly improved, and as a result, the phenomenon of 'embrittlement' can be delayed or inhibited.

Description

technical field [0001] The invention relates to a zinc-aluminum welding wire, in particular to a method for manufacturing a composite flux-cored zinc-aluminum welding wire containing beryllium magnesium and rubidium salt. Background technique [0002] Copper and its alloys have excellent electrical conductivity, thermal conductivity, corrosion resistance and good processing and forming properties. They are metals that were developed and utilized in the early stage. However, due to the premature and excessive development of copper, copper resources are exhausted, making copper a metal in short supply. Aluminum and its alloys have excellent qualities such as low density, high specific strength, good low temperature performance, high thermal conductivity and electrical conductivity, and good processing performance. They are more and more widely used in various fields of national economy and national defense construction, and the amount is second only to Compared with steel, it ...

AI Technical Summary

Problems solved by technology

[0004] However, there are still some deficiencies in the existing composite flux-cored zinc-aluminum welding wire: metal impurities (such as Fe, Pb) and gas impurities (such as O 2 , H 2 ) are more, and the cleanliness is not high. On the one hand, the welding wire is greatly affected by the humid and hot environment during storage (Fe, Pb, O 2 , H 2 Such impurities can easily lead to intergranular corrosion of zinc-aluminum alloy in hot and humid environment), often with the extension of time, the wire will gradually become brittle and hard, and the brazing performance will deteriorate accordingly, which is usually called "corrosion" or "brittleness". ”; on the other hand, slag inclusions and pores are generated during the welding process, which reduces the brazing rate, and the strength and reliability of the joint cannot be guaranteed

For example, when used on refrigeration equipment, if the soldering rate of the welding wire is low, the copper-aluminum pipe joint will leak, and the toxic refrigerant may cause personal injury; for example, in the electric power and automobile industry equipment, the failure of the copper-aluminum joint will lead to " "Sparking" phenomenon may cause accidents, which limit the application of composite flux-cored zinc-aluminum welding wire