Butt joint method of thin-wall metal pipe

Abstract

The invention relates to a butting method for metal thin-walled pipes. The method comprises the following steps: firstly, expanding one port of two butting ports of the metal thin-walled pipes to be butted; secondly, carrying out flange formation processing on the expanded position of the end of the expanded pipe, forming the other port of the two butting ports by bulge stamping, and making the maximum diameter of bulge equal to the maximum diameter of the flange; and finally, inserting the end formed by bulge stamping into the port which is subjected to expanding and flange forming, and tightly combining the butting positions of the metal thin-walled pipes by a lathedog, a bolt and a nut to complete the butting. The method has the advantages of simple process and reliable assembly; the butting positions of the metal thin-walled pipes have higer toughness and strong impact resistance, so that defects of rupture, disjoint and deficient tensile-strength easily occurred after the butting of the prior metal thin-walled pipes can be overcome; the butted metal thin-walled pipes in not only have the advantages of material conservation, beautiful molding, smooth curve and concise structure, but also effectively improve stopping property and inoxidability.

Description

technical field [0001] The invention relates to a method for butt jointing of metal thin-walled pipes, which belongs to the structural field of butt jointed metal thin-wall pipes. Background technique: [0002] At present, the butt joint structure of metal thin-walled pipes commonly used in the market generally adopts flange type, plug-in type, and butt welding. The process is cumbersome and the directionality is also constrained, and the oxidation of the material during welding shortens the service life of the pipe fittings, and the tensile strength is not enough to easily break; the plug-in type metal thin-walled pipe is inserted in parallel with the pipe end, and the installation is relatively simple. However, it is easy to fall off and leak during use; the butt welded metal thin-walled pipe is to weld two sections of steel pipe together, the process is simple, but the aesthetics is poor, and the material is oxidized during welding, which shortens the service life and ten...

AI Technical Summary

Problems solved by technology

[0002] At present, the butt joint structure of metal thin-walled pipes commonly used in the market generally adopts flange type, plug-in type, and butt welding. The process is cumbersome and the directionality is also constrained, and the oxidation of the material during welding shortens the service life of the pipe fittings, and the tensile strength is not enough to easily break; the plug-in type metal thin-walled pipe is inserted in parallel with the pipe end, and the installation is relatively simple. However, it is easy to fall off and leak during use; the butt welded metal thin-walled pipe is to weld two sections of steel pipe together, the process is simple, but the aesthetics is poor, and the material is oxidized during welding, which shortens the service life and tensile strength of the pipe fittings. It is not easy to break easily enough, there is no adjustment margin after the metal thin-walled tube is formed, and the design and manufacturing requirements are strict

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