Local Flame Heating Ultrasonic Brazing Method of Aluminum Alloy Sealing Structure

Abstract

The invention discloses an aluminum alloy seal structure local flame heating ultrasonic braze welding method which is used for conducting sealing and braze welding encapsulation on aluminum alloy cavities of built-in electronic components. The aluminum alloy seal structure local flame heating ultrasonic braze welding method comprises the first step of polishing and clearing an aluminum alloy surface of a joint to be brazed through abrasive paper; the second step of placing low-temperature Sn-based brazing filler metal on one side of the lap joint end of an aluminum alloy sealing surface; the third step of conducting local reciprocating heating on the brazing filler metal through gas flame flow to make the brazing filler metal melt and maintain a liquid state, and no heating on parent metal; the fourth step of applying ultrasonic vibration on a cavity of the aluminum alloy to be welded; the fifth step of finishing sealing the test piece through natural cooing after the ultrasonic vibration is finished. According to the aluminum alloy seal structure local flame heating ultrasonic braze welding method, overall heating is not conducted when the aluminum alloy seal structure is welded, local heating is conducted only on the brazing filler metal area, heating on a sealing element is extremely small, and the electronic components in the sealing element are not affected by heat. The aluminum alloy seal structure local flame heating ultrasonic braze welding method has the advantages of being simple in technology, high in welding efficiency, and suitable for the engineering application.

Description

technical field [0001] The invention relates to a brazing process for an aluminum alloy sealing structure, in particular to a local flame heating ultrasonic brazing method for an aluminum alloy sealing structure. Background technique [0002] In the equipment of electronics, communication and other industries, some electronic components are required to be used in a specific environment, so these electronic components need to be sealed to avoid contamination of the device by dust in the air and pollution of harmful atmosphere in the environment, thus ensure its reliability. [0003] The aluminum alloy structural parts have the characteristics of high strength, low density and good corrosion resistance, so they are used in the sealing structure of electronic components. For example, high-frequency components such as aluminum waveguides, aluminum shielding boxes, and aluminum microstrip boxes are sealed by brazing processes. The first few steps of the brazing process of these...

AI Technical Summary

Problems solved by technology

However, magnetron sputtering to coat a layer of Cu on the surface of aluminum alloy is complex, costly, and time-consuming, which is not conducive to engineering applications.

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