Manufacturing method of high performance brazing aluminum alloy

Abstract

The invention discloses a manufacturing method of a high performance brazing aluminum alloy. The manufacturing method comprises six steps: smelting, refining, degassing, cast rolling, cold rolling, finishing and detecting and packaging. In the six steps, three times of variation treatment are mingled. An aluminum and strontium intermediate alloy which is a long-term alterant selected in first timevariation is long in alterative lasting time and is suitable for earlier stage alteration; an aluminum and barium intermediate alloy selected in second time variation is free of an inhaling phenomenon, so that the degassing effect is not affected; an Al-5Ti-1B alloy wire is selected for the last variation to ensure the refined grain effect of the Al-5Ti-1B alloy wire, and the integral refined grain effect is intensified. The previous two alterants are the aluminum and strontium intermediate alloy and the aluminum and barium intermediate alloy capable of coexisting. According to the manufacturing method disclosed by the invention, bulky eutectic silicon tissues in a 4045 alloy can be refined effectively. The cold rolling difficulty is reduced and the process efficiency is improved while the low melting point of the brazing aluminum alloy is guaranteed and the mechanical property is stable.

Description

technical field [0001] The invention relates to the field of production of aluminum alloy flux sheets, in particular to a method for manufacturing aluminum alloys for high-performance brazing. Background technique [0002] Aluminum alloys are lightweight and have high thermal conductivity, so they can be used in automotive heat exchangers, such as radiators, condensers, evaporators, heater cores, intercoolers, etc. [0003] Aluminum alloy soldering flux has the characteristics of low melting point, smooth surface, good air tightness, stable shape and size, and the structure of the weldment is uniform and the performance changes fluctuate. Therefore, it is often used in the welding of heat sinks in automotive heat exchangers. [0004] Most of the current aluminum alloy flux sheets use 4045 alloy aluminum foil as the core material of aluminum alloy flux sheets, and laminate sacrificial anode materials and brazing filler metals. The production cycle is long, the yield is low, a...

AI Technical Summary

Problems solved by technology

[0004] Most of the current aluminum alloy flux sheets use 4045 alloy aluminum foil as the core material of aluminum alloy flux sheets, and laminate sacrificial anode materials and brazing filler metals. The production cycle is long, the yield is low, and the production process is long. high cost

[0005] The main reason is that the 4045 alloy has a long temperature span in the crystallization region and contains a relatively high content of silicon, which leads to the coarse eutectic silicon structure in the cast-rolled slab, which makes it impossible to roll in cold rolling.