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Welding method of copper tube

A welding method and technology for copper pipes, which are applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of good fluidity of copper liquid, poor adhesion, and difficult to control welding, and improve welding quality. , Reduce the generation of pores and ensure the effect of welding strength

Active Publication Date: 2014-05-21
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Abstract
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Problems solved by technology

In addition, the fluidity of copper liquid is good, the adhesion is poor, and it is difficult to control during welding

Method used

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  • Welding method of copper tube

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0019] The invention provides a copper tube welding method, comprising:

[0020] Step 1. Clean the surface of the copper tube 1 to be welded. Before welding, the oxide film, oil and other dirt on the bevel edge and surface of the copper tube must be cleaned to avoid defects such as pores. After cleaning, use a copper wire wheel or The stainless steel wire wheel is polished near the groove until it reveals a metallic luster;

[0021] Step 2. Preheat the bevel 2 and both ends of the copper tube to be welded. The preheating temperature should not be too high, otherwise the mechanical properties of the welded joint will be easily reduced;

[0022] Step 3. Place the copper tube to be welded vertically. Compared with flat welding, the connection surface of the vertical welding tub...

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Abstract

The invention relates to the technical field of welding, in particular to a welding method of a copper tube. The welding method comprises the following steps: a surface of the copper tube to be welded is cleaned; a groove and two ends of the copper tube to be welded are preheated; a clamping device is arranged at the groove of the copper tube to be welded, the inlet / the outlet for a welding torch is formed in the clamping device, when the welding torch is placed in the inlet / the outlet, the clamping device and the outer wall of the copper tube to be welded form a closed space, the groove of the copper tube to be welded is heated after vacuumizing, a flux is coated at welding parts, a chromium nickel stainless steel electrodes and silver electrodes are respectively placed at different welding parts to carry out a primary welding and a secondary welding, the silver electrodes are fixed between the outer wall of the copper tube to be welded and the clamping device by the clamping device; after the silver electrodes are molten completely, the power is shut off, and heat preservation is carried out, and the clamping device is removed. The welding method of the copper tube disclosed by the invention enhances the welding strength and sealing of the copper tube, and further reduces the generation of air holes in welding parts and improves the quality for the welded copper tube.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a copper tube welding method. Background technique [0002] Copper has extremely high electrical conductivity, thermal conductivity and excellent plasticity. The high thermal conductivity makes the local heating condition worse, the heat cannot be concentrated, and the heat is lost quickly, which requires the preheating of the base metal before welding. Copper is also a metal with a high thermal expansion coefficient, which is 1.5 times higher than that of low-carbon steel. When welding, it will produce large deformation or increase welding stress to cause cracks. In addition, liquid copper has good fluidity and poor adhesion, making it difficult to control during welding. When the temperature is around 550°C, the mechanical properties of copper drop significantly, which is also a cause of defects during welding. In addition, in the welding of red copper, pores are prone to oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
CPCB23K31/02B23K2103/12
Inventor 陈金华宋清波李均分罗德鹏
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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