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Seamless welding process of copper tube

A technology of seamless welding and copper tubes, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of complex process, low yield, flame temperature control, high standard of interface socket progress, etc., to ensure uniformity Effect of heating and temperature

Inactive Publication Date: 2019-05-21
TIANJIN ERJIAN WATER & ELECTRICAL INSTALLATION ENG
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  • Abstract
  • Description
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Problems solved by technology

[0003] Compared with the traditional electric welding of steel pipes, copper pipes are more and more popular because of their high-quality properties such as high temperature resistance, high pressure, corrosion resistance, and water quality assurance. However, the brazing process has high technical content and complicated processes. The temperature control and interface socket progress standards are high, and the selection of solder and flux, annealing treatment, welding tools and welding gas are strict. Operators must have high technical ability to be able to weld well, resulting in no copper tubes. Seam welding yield is low

Method used

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with embodiments.

[0040] 1. Pre-welding treatment: remove the oil, oxide, burr and other debris on the surface of the copper pipe and the joint before welding, to ensure that the end of the copper pipe and the joint surface are clean and dry, and the solder must be clean and dry. You can first remove the oil stains and debris on the surface of the welding joint end you need, wipe off the oxide scale with a fine emery cloth, then clean it with organic solvents such as alcohol, acetone, and finally dry it with a towel, and perform brazing immediately to avoid the normal temperature of the weldment. Oxidation occurs below. In order to ensure the gap of brazed joints, the joint surface of brazed joints should meet the requirements of reasonable surface roughness, which should generally reach Ra6.3um.

[0041] 2. Inspection: After the cleaning process, it is still possible that the surface of the copper pip...

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Abstract

The invention discloses a seamless welding process of a copper tube, which aims at solving the problem of low brazing yield of the copper tube; the key points of the technical scheme are (1) pre-welding treatment; (2) inspection; (3) cutting; (4) installation of socket-and-spigot joint; (5) brazing clearance; (6) axial deviation of the copper tube; (7) selection of a welding torch and a welding nozzle; (8) selection of combustible gas; (9) flame regulation; (10) preheating and heating; (11) brazing connection; (12) heating and maintaining; (13) cooling operation; (14) post-welding treatment. The seamless welding process of the copper tube provided by the invention can improve the finished product rate of seamless welding, so that the copper tube has long service life and high stability after brazing.

Description

Technical field [0001] The invention relates to a copper tube welding process, more specifically, it relates to a copper tube seamless welding process. Background technique [0002] Copper pipe brazing is to heat copper pipes and copper pipe fittings with copper-phosphorus solder or tin solder with a lower melting point than copper. When the copper pipes and copper pipe fittings do not melt, heat until the solder is melted, and then make The molten solder fills the gap of the socket, cools and crystallizes to form a brazed joint, which becomes a firm joint. [0003] Compared with traditional electric welding of steel pipes, copper pipes are more and more popular because of their high-temperature resistance, high pressure resistance, corrosion resistance, and water quality. However, the brazing process has high technical content and the process is more complicated. The temperature control and the high progress standard of interface sockets, the selection of solder and flux, anneali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20B23K1/00
Inventor 李彦彰赵骏谢辉田德君
Owner TIANJIN ERJIAN WATER & ELECTRICAL INSTALLATION ENG
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