Efficient butt-joint laser welding method for laminated duplex-metal composite material

Abstract

The invention discloses an efficient butt-joint laser welding method for a laminated duplex-metal composite material. The efficient butt-joint laser welding method comprises the steps that a base layer retaining layer is arranged at the portion, close to one side of a composite layer, of a base layer to form an I-type groove; the characteristic that in the laser penetration-type welding process, liquid metal at the upper portion and liquid metal at the lower portion inside a molten bath conduct Marangoni convection at the respective positions under the action of metal vapor friction and the temperature gradient, and little convection exchange happens between the liquid metal at the upper portion and liquid metal at the lower portion is used for being matched with the laminated characteristic of the laminated duplex-metal composite material, and the performance characteristics of two metal materials in a weld joint are ensured. The efficient butt-joint laser welding method has the advantages that one-time butt-joint welding forming of metal of the composite layer and some metal of the base layer is achieved, the working procedures of sealing and welding of a transition layer during a traditional composite board or composite pipe butt-joint welding are omitted, and the depth and the width of the remaining groove in the base layer are reduced, in other word, the welding amount of the base layer is reduced.

Description

【Technical field】 [0001] The invention belongs to the technical field of material processing, and relates to a high-efficiency butt joint laser welding method for layered bimetallic composite materials. 【Background technique】 [0002] Layered structure bimetallic composite material refers to the mechanical or metallurgical combination of different metals with extremely different strength, melting point and thermal expansion coefficient through explosive welding, rolling and other processes to obtain a new composite structural material. Its characteristics It is to integrate the advantages of different materials, give full play to the characteristics of different materials, and at the same time, greatly save rare and precious metal materials, reduce the manufacturing cost of equipment, and make the application of rare and precious metals in many fields possible, for example, in corrosive environments. In the fields of petroleum, petrochemical enterprises, nuclear industry, me...

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Problems solved by technology

[0005] The object of the present invention is to provide a high-efficiency butt laser welding method for layered bimetallic composite materials to solve the problems of complex procedures and low welding efficiency during butt welding of layered bimetallic composite materials

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