Lamination preparation process of metallic laminated tube of homogeneous or heterogeneous materials

Abstract

The invention relates to a lamination preparation process of a metallic laminated tube of homogeneous or heterogeneous materials. The method comprises the following steps: treatment of raw material tubes: selecting two metal tubes, i.e., an outer tube and an inner tube as required, and separately carrying out superplastic treatment on the outer tube and the inner tube before lamination, so as to obtain a superplastic texture structure, wherein the outer tube and the inner tube are matched in tube diameter, and thus, the gap between the tubes is as small as possible before lamination; preparation of bonded faces: carrying out mechanical or chemical treatment on the bonded faces of the outer and inner tubes; fitting of the outer and inner tubes; welding lamination: carrying out heated welding lamination after the outer and inner tubes are fit, wherein a heating temperature is in accordance with one metal tube, which has a lower temperature interval and has superplasticity, of the metal tubes of two materials. Thick-walled homogeneous metallic tubes or laminated metallic tubes with small tube diameters can be produced, the doorsill requirements of production equipment are lowered, fusion casting equipment is not required, welding lamination is carried out without employing welding materials, thorough-metallurgical-bonded weld joints are obtained, and the bond strength between tubes is improved.

Description

technical field [0001] The invention relates to the technical field of steel plate processing, in particular to a composite preparation process for metal composite pipes made of the same or different materials. Background technique [0002] When the internal and external properties of steel pipes are required to meet different requirements, composite metal pipes are generally used. At present, there are four manufacturing methods: 1. Melting and casting method, one side of a metal tube blank is melted and cast another metal hot melt with a low freezing point to prepare the tube blank. Then heat and roll into a composite metal pipe. This composite method requires metallurgical casting equipment and rolling equipment; 2. Liquid phase diffusion welding / brazing: pretreatment is carried out on the joint surface of the pipe to be composited, and brazing is added to the gap between the inner and outer pipes Flux or a layer of brazing material is coated on the outside of the inner t...

AI Technical Summary

Problems solved by technology

[0002] When the internal and external properties of steel pipes are required to meet different requirements, composite metal pipes are generally used. At present, there are four manufacturing methods: 1. Melting casting method, casting another metal hot melt with a low freezing point on one side of a metal tube blank to prepare the tube blank. Then heat and roll into a composite metal pipe. This composite method requires metallurgical casting equipment and rolling equipment; 2. Liquid phase diffusion welding / brazing: pretreatment is carried out on the joint surface of the pipe to be composited, and brazing is added to the gap between the inner and outer pipes Flux or a layer of brazing material is coated on the outside of the inner tube, and the two layers of tubes are tightly bonded by processing measures, heated under the atmosphere protection, and an infiltration brazing joint is formed between the tubes, which has considerable connection strength; but this This kind of connection requires the addition of brazing flux, and the distribution of brazing flux is not easy to be uniform, which increases the complexity of the process; 3. Mechanical composite method: the inner and outer pipes are tightly bonded after taking processing measures, but there is no metallurgical bonding between the pipes. When in use, additional treatment needs to be done on the pipe joints to ensure the airtightness of the joints; 4. Metal composite plate pipe welding method: the composite metal plate is used to make the pipe, the outer layer and inner layer metal are respectively welded to each other, and welding materials are added. The layered metal pipes need to be beveled respectively, and a welding transition layer is required at the transition of the two-layer metal interface. The production process is complicated and the efficiency is low.

There are also metal pipes of the same kind that are difficult to produce by the current rolling and piercing process due to special specifications, such as small diameter thick-walled metal pipes