Laser seal welding technique for 3A21 aluminum alloy casing

An aluminum alloy shell, 3A21 technology, applied in the field of micro-assembly component packaging and testing process, can solve the problems of complex 4047 aluminum alloy production process, affecting product yield and reliability, complex circuit and bare chip structure, etc. The appearance of the weld is beautiful and the thermal deformation is small.

Active Publication Date: 2015-11-25
48TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the cover plate of the aluminum alloy microwave component shell used for airtight packaging generally adopts the aluminum alloy of the grade 4047, and the shell generally adopts the aluminum alloy of the grade 6061 or 6063, but the production process of the 4047 aluminum alloy is complicated, the cost is high, and the material source Unstable, seriously affecting product yield and reliability
The aluminum alloy with the grade 3A21 is an anti-rust aluminum alloy, which is characterized by strong corrosion resistance and low cost, but the general laser welding process is prone to various welding defects, such as excessive weld porosity, slag inclusions, and joint mechanical properties Not up to standard, etc.
Due to the complex structure and high cost of the circuits and bare chips inside electronic devices and components, it is of great significance to study a suitable laser welding process to realize the airtight packaging of 3A21 aluminum alloy electronic devices and component shells

Method used

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  • Laser seal welding technique for 3A21 aluminum alloy casing
  • Laser seal welding technique for 3A21 aluminum alloy casing

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Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the 3A21 aluminum alloy shell to be sealed and welded by laser is 30mm×30mm, and the inner cavity volume is about 3.7cm 3 , the 3A21 aluminum alloy shell includes a 3A21 aluminum alloy shell and a 3A21 aluminum alloy cover plate, the welded joints are butt jointed, the thickness of the cover plate is 1mm, and the fit gap between the shell and the cover plate is 0.06mm. A laser sealing welding process of the above-mentioned 3A21 aluminum alloy casing of the present invention, such as figure 1 shown, including the following steps:

[0030] (1) Cleaning: Soak the 3A21 aluminum alloy casing with acetone and absolute ethanol in sequence. After soaking, wipe the inside and outside of the 3A21 aluminum alloy casing with dust-free paper to remove oil stains on the surface of the casing, and then dry the casing with nitrogen.

[0031] (2) Vacuum baking: place the cleaned 3A21 aluminum alloy shell on the heating plate in a vacuum oven, and bake the shell for ...

Embodiment 2

[0038] In this embodiment, the 3A21 aluminum alloy shell to be sealed and welded by laser is 30mm×30mm, and the inner cavity volume is about 3.4cm 3 , the 3A21 aluminum alloy shell includes a 3A21 aluminum alloy shell and a 3A21 aluminum alloy cover plate, the welded joints are butt jointed, the thickness of the cover plate is 1.5mm, and the fit gap between the shell and the cover plate is 0.1mm. A laser sealing welding process of the above-mentioned 3A21 aluminum alloy casing of the present invention, such as figure 1 shown, including the following steps:

[0039] (1) Cleaning: Soak the 3A21 aluminum alloy casing with acetone and absolute ethanol in sequence. After soaking, wipe the inside and outside of the 3A21 aluminum alloy casing with dust-free paper to remove oil stains on the surface of the casing, and then dry the casing with nitrogen.

[0040] (2) Vacuum baking: place the cleaned 3A21 aluminum alloy shell on the heating plate in a vacuum oven, bake the shell for 4 h...

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Abstract

The invention discloses a laser seal welding technique for a 3A21 aluminum alloy casing. The laser seal welding technique comprises the following steps of visual alignment, laser spot welding location and laser seal welding. The technological parameters of the laser seal welding are that the laser pulse peak power is 3000W-3500W, the impulse waveform is preheating thermal-insulation wave, the pulse width is 4ms-8ms, the pulse repetition frequency is 10Hz-20Hz, the welding speed is 108mm / min-180mm / min, and the defocusing amount is -1mm to -2mm. The laser seal welding technique for the 3A21 aluminum alloy casing can effectively remove cracks and air holes on welding seams of laser welding of the 3A21 aluminum alloy casing. The sealed 3A21 aluminum alloy casing has the beneficial effects of being attractive in welding seam appearance, high in air tightness, high in reliability, high in efficiency and low in cost.

Description

technical field [0001] The invention belongs to the technical field of packaging and testing technology of micro-assembled components, and in particular relates to a laser sealing welding process of a 3A21 aluminum alloy shell. Background technique [0002] With the further improvement of electronic machine and system performance, high-tech performance and high reliability have become two key parameters of military electronic equipment and other high-tech electronic products, and the reliability of electronic devices and components plays a decisive role in it . Electronic devices and components mostly adopt advanced microwave multi-chip assembly technology, and a large number of microwave bare chips are used to protect the metal plating of these chips and packages from various harsh environmental conditions, such as moisture, acid rain and salt spray. Corrosion and mechanical damage , the metal casing of electronic devices and components must be hermetically encapsulated in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/32B23K26/60B23K26/12B23K26/70B23K101/36B23K103/10
CPCB23K26/123B23K26/24B23K2101/36B23K2103/10
Inventor 赵瓛邓斌万喜新王学仕周水清杨金文正何永平
Owner 48TH RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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