Soldering aluminum and brazing flux of aluminum alloy

Abstract

A flux of a welding aluminum and aluminum alloy relates to a brazing material. The aluminum alloy-aluminum alloy and the aluminium-aluminium alloy brazing flux of the invention is calculated by the mass percentage, with eutectic AIF3-CsF flux ranging from 97.0 to 99.9, zinc fluoride ranging from 0.1 to 3.0, tin fluoride ranging from 0 to 0.5. The invention is the flux for the aluminum alloy-aluminum alloy and the aluminium-aluminium alloy with high tensile strength.

Description

technical field [0001] The invention relates to a brazing material, in particular to a brazing material for aluminum alloy-aluminum alloy and aluminum-aluminum alloy brazing. Background technique [0002] Compared with other metals, aluminum and aluminum alloys are more difficult to braze, mainly because a layer of dense and chemically stable Al is easy to form on the surface of aluminum. 2 o 3 film, difficult to remove. There are many research results on fluxes for aluminum alloy brazing at home and abroad. Professor Zhang Qiyun of Peking University published a paper in ["(Thermochimica Acta", 303(1997)]: "A study on the phase diagram of AlF 3 -CsF system", which exposes AlF 3 -CsF system phase diagram, pointing out that the eutectic composition is AlF 3 :CsF=42.0:58.0 (molar ratio), melting temperature is 471°C. This type of flux has high brazing performance, special activity to aluminum alloys with high magnesium content, and high stability to flames. It can be use...

AI Technical Summary

Problems solved by technology

AlF 3 -CsF series flux with 80:20 zinc-aluminum solder, under high-frequency induction pressure, brazing aluminum alloy 4047-aluminum alloy 6063, the measured tensile strength is 108-126MPa, brazing aluminum (Al99.70)-aluminum Alloy 4047, the measured tensile strength is 115-130MPa, the tensile strength is low, and the application range is limited