Preparation method of aluminum-silicon alloy welding rod for soldering

Abstract

The invention provides a preparation method of an aluminum-silicon alloy welding rod for soldering. The preparation method comprises the steps that aluminum-silicon alloy powder and soldering flux powder are evenly mixed and then pressed into a bar billet with the diameter of 20 mm through a tablet press, and then an insulation barrel is placed into a microwave sintering furnace; then a furnace chamber is vacuumized till the vacuum degree in the furnace chamber is lower than 0.1 Pa, then argon with the purity of 99.99% is introduced into the furnace chamber, the output power of the microwave sintering furnace is controlled, the temperature is increased at a certain speed, and heat preservation is conducted; afterwards, the microwave sintering furnace is stopped, so that a sample is cooledalong with the furnace to obtain an aluminum-silicon alloy bar; and finally, the bar is placed into an extrusion die so as to be hot-extruded at a time to make the diameter of the bar reach 3 mm, andthus, the aluminum-silicon alloy welding rod for soldering is obtained. The preparation method is easy and convenient to implement, low in equipment requirement, high in production efficiency, low inenergy consumption and suitable for industrial production; and the welding rod has the advantages that the wettability of the welding rod is as good as that of base metal, and the soldering strength is high.

Description

technical field [0001] The invention relates to a preparation method of an electrode, in particular to an aluminum-silicon alloy electrode for brazing and a preparation method thereof. Background technique [0002] Due to the advantages of low density and high specific strength, aluminum alloys have been more and more widely used in aviation and aerospace industries. For example, many traditional copper alloy waveguides and high-frequency devices have been replaced by aluminum alloys. It is the most ideal method to manufacture complex aluminum structures by brazing. With the lightening of vehicles, the application range of aluminum alloys is gradually widening, and its connection, especially welding, has received extensive attention. One of the commonly used aluminum alloy welding methods is brazing. Aluminum-silicon alloy solder has good wetting properties. It is the most widely used aluminum brazing material in aluminum alloy brazing, and the current aluminum-silicon allo...

AI Technical Summary

Problems solved by technology

With the lightening of vehicles, the application range of aluminum alloys is gradually widening, and its connection, especially welding, has received extensive attention. One of the commonly used aluminum alloy welding methods is brazing. Aluminum-silicon alloy solder has good wetting properties. It is the most widely used aluminum brazing material in aluminum alloy brazing, and the current aluminum-silicon alloy welding rods often use non-vacuum casting, extrusion, rolling It is made by processes such as welding and annealing, which requires high equipment, low production efficiency, large energy consumption, and uneven flux mixing.

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