Friction stir welding-braze welding composite welding method for dissimilar metal bonding structure

A technology of friction stir welding and dissimilar metals, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of reducing the effective bearing thickness of the interface, difficult to remove, structural failure, etc., to avoid brittle metal The effect of compound
CN104923927AInactive Publication Date: 2015-09-23NANCHANG HANGKONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANCHANG HANGKONG UNIVERSITY
Publication Date
2015-09-23
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A friction stir welding-braze welding composite welding method for a dissimilar metal bonding structure is provided. The operation process of the method is as follows: before welding, a material with low hardness is placed on the upper layer, a material with high hardness is placed on the lower layer, and a soft solder with a low melting point, such as pure Zn or a Zn-matrix solder, is placed between two plates; a stirring head which rotates at a high speed is inserted into the metal in the upper layer, a stirring pin enters the metal in the lower layer, and the solder which is clamped between two types of metal is melted by stirring friction heat; and finally excess melted solder is extruded under the pressure action of a shaft shoulder, the purification of the interface is realized, diffusion bonding is formed, and the purpose of welding is achieved. According to the method, composite welding seams can be obtained; the effective bonding width of the bonding structure can be increased; stress concentration and the interface effect of the bonding interface are reduced; and the service performance of joints is improved.
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Description

technical field

[0001] The invention belongs to the field of metal welding, and relates to a composite welding method for simultaneously realizing friction stir welding connection and brazing connection of dissimilar metal overlapping structures. Background technique

[0002] Dissimilar metal welded joints are widely used in many fields because they have the properties of two metals and have the effect of complementing each other's advantages and avoiding weaknesses. For example, in the field of automobile industry, the use of aluminum / steel bimetallic joints can greatly reduce the weight of the structure on the premise of ensuring the bearing capacity of the joints, laying a foundation for reducing the weight of the body and reducing fuel consumption. Studies have shown that when the weight of the car Every 25% reduction can save 50% of fuel consumption; in the field of aviation industry, "reducing weight and increasing thrust-to-weight ratio" has become an important design...

Claims

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