Metal composite pipe and manufacturing method thereof

Abstract

The invention discloses a metal composite pipe and a manufacturing method thereof, and belongs to the technical field of metal pipe fittings. The metal composite pipe comprises a metal composite strip material part and a welding seam part, the metal composite strip material part is formed by curling a metal composite strip material which takes iron or stainless steel as a base material and covers one surface or two surfaces of the base material with different metals from the base material, so that two opposite longitudinal side end surfaces of the metal composite strip material are opposite to form a longitudinal straight seam; welding the two opposite longitudinal side end surfaces, heating a welding seam, cladding the welding seam with metal which is the same as the metal layer covered by the metal composite strip, crystallizing and solidifying the clad metal on the welding seam to form a clad metal layer, and forming an atom interpenetration welding seam bonding layer between the clad metal layer and the welding seam; the bonding force between the inner metal layer and the outer metal layer is improved, the technical purpose that the inner face and the outer face of the base material can be covered with the metal layers on the basis that the strong bonding force between the inner metal layer and the outer metal layer is guaranteed is achieved, the long-size metal composite pipe can be prepared, and manufacturing is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pipe fittings, and in particular relates to a metal composite pipe and a manufacturing method thereof. Background Art

[0002] A metal composite pipe is a pipe composed of different metal materials radially combined and stacked. The currently popular composite methods include: explosive composite method, drawing composite method, hydraulic composite method, mechanical rolling method, etc. These methods all use different types of metal forming pipes with different diameters to form composite pipe liners and / or outer jackets. The inner and outer metal layers are mechanically bonded, and the bonding strength is relatively low. In order to improve the bonding strength between the inner and outer metal layers, a continuous casting composite method has been developed. The preheated solid substrate tube is passed through another molten metal liquid. A layer of metal liquid is clad on the surface of the substrate tube, and then melted and crystallized to form a multi-layer metal composite tube. An atomic interpenetration bonding layer is formed between the inner and outer metal layers, and the bonding strength is strong. However, such a manufacturing method still uses a formed tube as a substrate tube, and can only composite a metal layer on the outer surface. Summary of the invention

[0003] The purpose of the present invention is to solve the defects of the existing metal composite tube manufacturing method using a formed tube as a base tube, that the bonding force between the inner and outer layers of the metal is not strong or the metal layer can only be composited on the outer surface of the base tube, and to provide a metal composite tube with strong bonding force between different metal layers and capable of covering dissimilar metals on both sides of the base tube and a manufacturing method thereof.

[0004] To this end, the present invention adopts the following technical scheme: a metal composite pipe, characterized in that the metal composite pipe includes a metal composite strip portion and a weld portion, the metal composite strip portion is formed by curling the metal composite strip, the metal composite strip uses iron or stainless steel as a substrate, one side or both sides of the substrate are covered with a metal different from the substrate to form a covering metal layer, an atomic interpenetration bonding layer is formed between the covering metal layer and the substrate, the weld portion includes a weld and a weld cladding metal layer clad on the outer surface of the weld, the weld cladding metal layer and the covering metal layer are the same metal, and an atomic interpenetration weld bonding layer is formed between the weld cladding metal layer and the weld.

[0005] The metal of the covering metal layer is copper, aluminum or zinc.

[0006] The thickness of the covering metal layer or weld cladding metal layer is not less than 0.03 mm.

[0007] The manufacturing method of the metal composite pipe is characterized in that the manufacturing process of the metal composite pipe includes the following steps: using a metal composite strip with a base material of iron or stainless steel and one or both sides covered with a metal different from the base material, curling it transversely into a cylindrical metal composite strip portion at room temperature, so that the two opposite longitudinal side end faces of the metal composite strip are opposite to each other to form a longitudinal straight seam, and then welding the two opposite longitudinal side end faces, and then heating the weld and cladding the weld with the same metal as the metal layer covered by the metal composite strip, so that the cladding metal crystallizes and solidifies on the weld to form a cladding metal layer, and an atomic interpenetration weld bonding layer is formed between the cladding metal layer and the weld.

[0008] The welding is performed by argon arc welding, laser welding or high frequency welding.

[0009] The present invention can achieve the following beneficial effects: a metal composite strip material with different metals covered on a substrate is used for room temperature curling straight seam welding to form a metal composite pipe, and then a metal is clad on the weld to form an atomic interpenetration bonding layer. The bonding force between the inner and outer metal layers is strong, and a common steel strip pipe making machine can be used to make the pipe. Long-sized metal composite pipes can be prepared, and the manufacturing is convenient. Both the inner and outer sides of the substrate can be covered with a metal layer, which expands the types and application range of metal composite pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the main viewing direction structure of the present invention.

[0011] Figure 2 yes Figure 1 AA section view.

[0012] Figure 3 yes Figure 2 A partially enlarged view of an implementation method at a in the figure.

[0013] Figure 4 room Figure 2 A partial enlarged view of another implementation method at a in the middle. Implementation

[0014] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. The described embodiments are only for illustration and explanation of the invention and do not constitute the sole limitation of the invention.

[0015] like Figure 1 to Figure 3As shown, the present invention is a metal composite pipe, comprising a metal composite strip portion 1 and a weld portion 2, wherein the metal composite strip portion is formed by curling a metal composite strip, wherein the metal composite strip has iron or stainless steel as a substrate 11, and one or both sides of the substrate 11 are covered with copper to form a covering metal layer 12 with a thickness of not less than 0.03 mm, and an atomic interpenetration bonding layer 13 is formed between the covering metal layer 12 and the substrate 11. The weld portion comprises a weld 21 and a weld cladding metal layer 22 clad on the outer surface of the weld, wherein the weld cladding metal layer 22 and the covering metal layer 12 are of the same metal, and an atomic interpenetration weld bonding layer 23 is formed between the weld cladding metal layer and the weld.

[0016] like Figure 4 As shown, the weld portion may further include a weld 21 and a weld cladding metal layer 22 clad on the outer surface and the inner surface of the weld.

[0017] The metal of the aforementioned covering metal layer may also be aluminum or zinc.

[0018] The manufacturing process of the metal composite pipe includes the following steps: using a base material of iron or stainless steel that can be directly purchased on the market, one side or both sides of which are covered with a metal different from the base material, and curling it horizontally at room temperature so that two opposite longitudinal side end faces are relative to each other to form a longitudinal straight seam, and then welding the two opposite longitudinal side end faces by argon arc welding, and then heating the weld and cladding the weld with the same metal as the metal layer covered by the metal composite strip, so that the cladding metal crystallizes and solidifies on the weld to form a cladding metal layer, and an atomic interpenetration weld bonding layer is formed between the cladding metal layer and the weld.

[0019] As another method, the two opposite longitudinal side end surfaces may also be welded by laser welding or high frequency welding.

Claims

1. Metal composite pipe, characterized by: The metal composite pipe comprises a metal composite strip portion and a weld portion. The metal composite strip portion is formed by curling the metal composite strip. The metal composite strip uses iron or stainless steel as a substrate. One or both sides of the substrate are covered with a metal different from the substrate to form a covering metal layer. An atomic interpenetration bonding layer is formed between the covering metal layer and the substrate. The weld portion comprises a weld and a weld cladding metal layer clad on the weld surface. The weld cladding metal layer and the covering metal layer are the same metal. An atomic interpenetration weld bonding layer is formed between the weld cladding metal layer and the weld.

2. The metal composite pipe according to claim 1, characterized in that: The metal of the covering metal layer is copper, aluminum or zinc.

3. A method for manufacturing a metal composite pipe according to claim 1, characterized in that: The manufacturing process of the metal composite pipe includes the following steps: using a metal composite strip with a base material of iron or stainless steel to curl it transversely into a cylindrical metal composite strip portion, so that the two opposite longitudinal side end faces of the metal composite strip are opposite to each other to form a longitudinal straight seam, and then welding the two opposite longitudinal side end faces, and then heating the weld and cladding the weld with the same metal as the metal layer covered by the metal composite strip, so that the cladding metal crystallizes and solidifies on the weld to form a cladding metal layer, and an atomic interpenetration weld bonding layer is formed between the cladding metal layer and the weld.

4. The method for manufacturing a metal composite pipe according to claim 3, characterized in that: The welding is performed by argon arc welding, laser welding or high frequency welding.

5. The method for manufacturing a metal composite pipe according to claim 3, characterized in that: The metal composite strip whose base material is iron or stainless steel is transversely rolled into a cylindrical shape. The metal composite strip is rolled at room temperature.

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