Transition layer-free butt welding method for layered double-metal composite

Abstract

The invention discloses a transition layer-free butt welding method for a layered double-metal composite. The transition layer-free butt welding method comprises the following steps of opening grooves in the multilayer side and the basement layer side of the composite or a composite tube respectively, filling connecting metal in the groove of the basement layer side by adopting a melt welding method, and then preparing a metal weld seam in the groove of the multilayer side by adopting a spraying method. The transition layer-free butt welding method has the technical effects that in the process of preparing the multilayer weld seam by adopting a hot or cold spraying method, the weld seam of a basement layer and a parent material cannot be obviously melted, and therefore, bonding of multilayer weld seam metal and basement layer metal is pure mechanical bonding or "localized melting" metallurgical bonding, mixing of a multilayer material and a basement layer material can be effectively inhibited, a great quantity of brittle intermetallic compounds are prevented from producing near a multilayer / basement layer interface, and thus the mechanical property of a butt joint of the layered double-metal composite is improved.

Description

technical field [0001] The invention belongs to the butt welding in the technical field of material processing, in particular to a transition layer-free butt 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, corrosion resistance, melting point, and thermal expansion coefficient through explosive welding, rolling, etc., to obtain a new layered structure. The composite material is characterized by combining the advantages of different materials and giving full play to the characteristics of different materials. At the same time, it greatly saves rare and precious metal materials, reduces the manufacturing cost of equipment, and enables equipment and structures with the performance advantages of rare and precious metals to be used in many fields. Widely used, for example, in the fields...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the transition layer in the weld metal that exists in the butt fusion welding of double-layer metal composites is easy to form a brittle phase, resulting in a decrease in the plasticity and toughness of the joint, as well as the problems of internal gaps, stress concentration, and overall mechanical performance decline when the lap cover is used for connection, waste of materials, low production efficiency, etc., the object of the present invention is to provide a transition layer-free butt welding method for layered bimetallic composites. The most essential feature of this method is that there is no Transition layer welds to enhance the mechanical properties of layered bimetallic composite butt joints

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