Welding agent and manufacturing process thereof

Abstract

The soldering agent consists of copper powder of granularity of 20-100 mesh with copper oxide in 15-70 wt% in 100 weight portions, aluminum powder of granularity of 80-200 mesh in 5-60 weight portions, calcium fluoride in 0.1-15 weight portions, silica in 0.1-8 weight portions, metasilicate in 0.1-10 weight portions, carbon in 0.1-3 weight portions and sliver powder in 0.1-10 weight portions. The production process includes the following steps: stoving, mixing, stirring and packing. The present invention has the advantages of firm soldering and raised conducting performance of joint, raised copper flowability under molten state for complete separation of Al2O3 from Cu, stable replacing reaction between copper oxide and aluminum powder resulting in stable soldering, simple preparation process and easy operation.

Description

technical field [0001] The present invention relates to a flux for welding metals and a method for producing the same. Background technique [0002] Usually, metal welding all needs external power supply or combustible gas, like this, is very inconvenient for operating in the field, high mountain, sea vessel. Therefore, in this construction environment, the electrical connection process traditionally uses bolts, peripheral pressure, crimping and other methods for connection. However, the joints of this connection method age quickly, and the resistance of the joints is generally too large. When a large current passes through, there are great hidden dangers and the service life is not long, especially in the lightning protection grounding grids of large petrochemical bases, substations, and power plants. It is very easy to cause accidents in the grounding system of laying and intelligent high-rise buildings. There was also a kind of exothermic flux before, as the publication...

AI Technical Summary

Problems solved by technology

Although the welding quality of this product has been improved, there are serious defects, because the formula of this flux still lacks some necessary ingredients. During the welding process, when the flux reacts, the reaction is very unstable. At the same time, it is difficult to remove the gas generated in the reaction during the reaction, and it stays in the copper water in the molten state, resulting in honeycomb pores inside the joint, which relatively increases the resistance of the joint, reduces the strength of the joint, and makes the joint The welding fastness and conductivity of the welding are greatly reduced, so that the service life of the welding joint is greatly reduced, and unnecessary economic losses are caused to the user; and the conductivity is reduced, and the joint will generate heat and be burned when a large current passes. However, the current passing through the lightning protection power grid is a very large high-voltage current, so there is a great hidden danger

This will not only cause economic losses to users, but also cause serious accidents during use, such as electric leakage, damage to electrical appliances and fires, etc., which will endanger people's lives in serious cases; In the process, the generated dregs such as Al2O3 are not completely separated from the welded joints, causing a large amount of dregs to mix with copper and accumulate in the welded joints. At the same time, the reduced copper content is low, which directly affects the quality of the joints. Resistivity increases the resistance of the joint, while the tensile strength of the joint decreases and the surface finish is rough. As we all know, aluminum oxide is a non-conductive substance, and the combination with copper cannot achieve the bonding fastness of the molecular structure. Obviously, the service life of the joint will be further reduced, and the increase in resistance will also cause the joint to heat up, shorten the service life of the joint and cause accidents, resulting in unsafe use by users and unnecessary economic losses.

And the preparation method of above-mentioned welding agent is also more complicated, so above-mentioned formula and its manufacture method all remain to be improved