Method for using ultrasonic vibration to process plug welding porous structure aluminium base composite material

Abstract

A method which adopts the ultrasonic vibration to carry out the plug welding of porous structure aluminum-based composite material relates to the plug welding method of the aluminum-based composite material. The method solves the problems that the existing porous structure has more welding connectors and complicated operation, the diffusion welding method needing high vacuum and great pressure isnot applicable, by adopting the conventional melt welding method, the usage of the high-temperature heating can cause a strengthening phase ceramics and a substrate aluminum alloy to generate the harmful reaction, thus leading the strengthening phase to be seriously burned and reducing the strength of the connector. The method of the invention is that: 1) the surface of an alloy column (1) is firstly carried out the pretreatment; 2) the aluminum-based composite material (4) is carried out the preheating and the ultrasonic vibration is applied; 3) the alloy column (1) which is coated with a brazing filler metal on the surface is arranged in a hole (5) of the aluminum-based composite material (4), the aluminum-based composite material (4) is preheated, the wall of the hole (5) is heated, theultrasonic vibration is applied after a brazing filler metal ring (8) is melted and a gap is filled, thus completing the welding. The welding connector of the invention has great shear strength, highstrength and reliable performance.

Description

technical field [0001] The invention relates to an aluminum-based composite material plug welding method. Background technique [0002] It is widely used to design structural parts with multiple threaded holes for fastening fittings on the panel, but when the panel material is made of materials that are difficult to machine, such as aluminum matrix composites with a volume fraction of ceramic particles as high as 20-55%. , then it is not possible to directly drill the thread and insert the threaded alloy column after drilling. When the bonding technology is used to inlay the alloy pillars, the bonding strength is low. During the tapping process, some alloy pillars will peel off and debond from the bonding interface of the composite material, and the connection quality cannot be guaranteed. Since the inner wall of the aluminum matrix composite material hole is very smooth after processing, the purely mechanical connection can only adopt the interference fit method, but the a...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing porous structure has many welded joints, the operation is complicated, and the method of diffusion welding requiring high vacuum and high pressure is not applicable, the high-temperature heating of the conventional fusion welding method will cause harmful reactions between the reinforced phase ceramics and the matrix aluminum alloy, causing The reinforcement phase is severely burned, reducing the strength of the joint, and even destroying the structure of the aluminum matrix composite material. The brazing method under non-vacuum conditions is difficult to wet between the reinforcement existing on the surface of the aluminum matrix composite material of the ceramic reinforcement phase and the filler metal. ; The use of traditional flux can not achieve the role of complete wetting of the solder and the base metal, there will be defects such as pores and unconnected after welding, and if the content of the reinforcing phase is high, the liquid solder cannot even spread on the surface of the composite material; Moreover, it can only realize the welding of the aluminum alloy column and the hole wall of the aluminum matrix composite material, and the joint after welding will also have defects such as unconnected, and cannot form a reliable connection. The method of material plug welding, the specific technical solution to solve the above problems is as follows:

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