Welding technology for copper pipe and steel pipe

Abstract

The invention discloses a welding technology for a copper pipe and a steel pipe. The copper pipe and the steel pipe are circular pipes. The technology comprises the steps that (1) the copper pipe and the steel pipe which are in insertion connection or butt connection are integrally fixed to a clamp body rotating on a machine tool at a constant speed; (2) the current of an argon arc welding gun is adjusted, the electric arc heating temperature of the argon arc welding gun is made to reach more than 1000 DEG C, the angle of the argon arc welding gun is adjusted, and the argon arc welding gun is made to be aligned with the portion where the copper pipe is combined with the steel pipe; (3) the argon arc welding gun is started to heat the circumference of the portion where the copper pipe is combined with the steel pipe when the copper pipe and the steel pipe rotate at the constant speed, after heating for 5 s, copper at the portion where the copper pipe is combined with the steel pipe is in the molten state, and steel at the portion where the copper pipe is combined with the steel pipe is in the semi-molten state, the copper and the steel naturally permeate each other and are blended, the copper pipe and the steel pipe are taken out to be cooled, and the copper pipe is tightly connected with the steel pipe. The welding technology is good in environment-friendly performance, easy and convenient to implement, low in cost and safe to use.

Description

technical field [0001] The invention relates to the connection of metal circular pipes, in particular to a welding process between copper pipes and steel pipes. Background technique [0002] At present, in various industries, the welding process of copper pipes and steel pipes generally adopts gas welding (brazing), and the solders are all high-silver electrodes. Higher, if you are not careful, the welding slag will cause the surface of the pipe to be uneven and affect the appearance; after welding, the pipe will be severely oxidized and must be chemically treated in cleaning, anti-rust and other processes, which will affect environmental protection and high processing costs; chemical treatment It is difficult to completely clean the chemical composition residues on the surface of the finished pipe fittings, especially around the weld seam. Some residues will remain in the weld seam for a long time, which is not conducive to safe use. SUMMARY OF THE INVENTION [0003] The...

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Problems solved by technology

[0002] At present, in various industries, the welding process of copper pipes and steel pipes generally adopts gas welding (brazing), and the solders are all high-silver electrodes. Higher, if you are not careful, the welding slag will cause the surface of the pipe to be uneven and affect the appearance; after welding, the pipe will be severely oxidized and must be chemically treated in cleaning, anti-rust and other processes, which will affect environmental protection and high processing costs; chemical treatment After the pipe fittings, the chemical residues on the surface are difficult to clean completely, especially around the welds, some residues will remain in the welds for a long time, which is not conducive to safe use

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