Welding process for copper aluminum tube

A welding process, copper-aluminum tube technology, applied in the field of copper-aluminum tube production, can solve problems such as large melting point gap, uneven penetration, virtual welding, etc., and achieve the effects of prolonging service life, improving welding quality, and improving reliability

Pending Publication Date: 2020-07-31
CHANGZHOU CHANGZHENG EVAPORATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding of copper-aluminum pipe joints is very difficult, because the melting point of copper and aluminum is very different, the melting point of copper is much higher, and the temperature difference of melting point of aluminum is very small. Some copper-aluminum tubes often have missing welding, virtual welding, many gap bubbles, uneven penetration, etc. Therefore, it is necessary to improve the existing production process

Method used

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  • Welding process for copper aluminum tube

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Effect test

Embodiment 1

[0020] Embodiment 1: a kind of welding process of copper-aluminum pipe, comprises the following steps:

[0021] S1. Reference figure 1 , cutting copper tubes and aluminum tubes, machining a flared conical copper tube connection at one end of the copper tube, after processing, the inner wall of the conical copper tube connection is pickled, water washed, After drying and grinding, one end of the aluminum tube is machined into a tapered aluminum tube connection, and at the same time, a ring-shaped protrusion is processed at the joint between the tapered aluminum tube connection and the aluminum tube body. The cross section of the ring-shaped protrusion is arc-shaped, and the height of the ring-shaped protrusion is 0.05mm. Then, the outer wall of the conical aluminum tube connection part is pickled, washed, dried and polished in sequence. The welding wire is wound on the outer wall of the connecting part of the shaped aluminum tube, and then the conical aluminum tube connecting ...

Embodiment 2

[0026] Embodiment 2: a welding process for copper-aluminum pipes, comprising the following steps:

[0027] S1. Reference figure 1 , cutting copper tubes and aluminum tubes, machining a flared conical copper tube connection at one end of the copper tube, after processing, the inner wall of the conical copper tube connection is pickled, water washed, After drying and grinding, one end of the aluminum tube is machined into a tapered aluminum tube connection, and at the same time, a ring-shaped protrusion is processed at the joint between the tapered aluminum tube connection and the aluminum tube body. The cross section of the ring-shaped protrusion is arc-shaped, and the height of the ring-shaped protrusion is 0.2mm. Then, the outer wall of the conical aluminum pipe connection is sequentially pickled, washed, dried, and polished. The welding wire is wound on the outer wall of the connecting part of the shaped aluminum tube, and then the conical aluminum tube connecting part of t...

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Abstract

The invention relates to the technical field of copper aluminum tube production, in particular to a welding process for a copper aluminum tube. The welding process comprises the following steps: S1, processing out a tapered copper tube connecting part at one end of an unloading copper tube, one end of an aluminum tube and one end of a copper tube in a machining way, processing out a tapered aluminum tube connecting part on the end part of one end of the aluminum tube in the machining way, winding a welding wire on the tapered aluminum tube connecting part of the aluminum tube, and inserting the tapered aluminum tube connecting part of the aluminum tube into the tapered copper tube connecting part of the copper tube to obtain a pre-fitted tube; S2, inserting a mandrel into the pre-fitted tube, placing the pre-fitted tube onto spinning equipment, spinning the outer part of the tapered copper tube connecting part of the copper tube to obtain a semi-finished product tube; S3, placing the semi-finished product tube onto welding equipment to weld at a welding temperature of 420-660 DEG C; and S4, cooling and packaging after welding to obtain a copper aluminum tube finished product. Copper aluminum tube welding quality is high, phenomena such as solder skips, insufficient soldering and more seam gas bubbles are reduced, and the service life is longer.

Description

technical field [0001] The invention relates to the technical field of copper-aluminum tube production, in particular to a copper-aluminum tube welding process. Background technique [0002] Copper-aluminum tube is a kind of connection tube often used in evaporators. It is generally welded by a section of copper tube and a section of aluminum tube. The welding of copper-aluminum pipe joints is very difficult, because the melting point of copper and aluminum is very different, the melting point of copper is much higher, and the temperature difference of melting point of aluminum is very small. Some copper-aluminum tubes often have missing welding, virtual welding, many gap bubbles, uneven penetration, etc. Therefore, the existing production process needs to be improved. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a copper-aluminum pipe welding process for the above-mentioned defects. The welding quality of th...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 洪伟国汪益平陈兰花刘明星
Owner CHANGZHOU CHANGZHENG EVAPORATOR
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