Environment-friendly and pollution-free aluminum product brazing wire and manufacturing process thereof

Abstract

The invention discloses an environment-friendly and pollution-free aluminum product brazing wire. The melting temperature of the brazing wire ranges from 520 DEG C to 560 DEG C, and the diameter of the brazing wire ranges from 1.6 mm to 4.0 mm. The brazing wire comprises, by mass, 5%-10% of potassium fluoride, 5%-15% of rare earth, 10%-25% of aluminum, 5%-15% of silicon, 2%-10% of bismuth and the balance of copper. All materials adopted for the aluminum self-fluxing material are environmentally friendly and meet the ROHS standard, so that zero environment pollution is achieved, and accordingly the health of operators is protected; no corrosive material is adopted, so that acid pickling after brazing is omitted, and accordingly the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to an environmentally friendly and pollution-free aluminum brazing wire and a preparation process thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection and the increasingly perfect and strict environmental regulations, although tin-lead solder has excellent wettability, solderability, good mechanical properties, low melting point and low price, etc., lead and its compounds are harmful to human beings. Harmful and toxic substances that are harmful to health and pollute the environment, so lead-free solder is needed in the electronics industry to replace traditional tin-lead solder, especially with the improvement of the weight, miniaturization and miniaturization of electronic products, the quality of electronic products The requirements are more stringent. Most of the existing lead-free solders are SnAg, SnCu, SnAgCu...

AI Technical Summary

Problems solved by technology

[0004] 1) The melting point of aluminum brazing material is around 580°C, which is very close to the melting point of the base metal (630°C), and the rate of defective welding is high. Skilled aluminum welding technicians must be used in actual brazing production, and the production cost is relatively high

[0005] 2) Use corrosive brazing flux, once it enters the pipe, it is easy to cause brazing filler metal corrosion

[0006] 3) Since the brazing flux and solder are separated, it is difficult to realize automatic welding, which directly restricts the realization of batch-scale automatic process