Plug-in type copper aluminum pipe welded joint and method of producing the same

A technology for welding joints and copper-aluminum pipes, applied in welding equipment, pipes/pipe joints/pipes, resistance welding equipment, etc. Quality and strength, not easy to fall off

Inactive Publication Date: 2008-12-10
左铁军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the outer diameter of the welded joint the same as the outer diameter of the aluminum tube, the diameter of the groove that clamps the aluminum tube in the electrode needs to be the same as the outer diameter of the aluminum tube, but in this way the aluminum tube cannot be clamped, and the aluminum tube is easy to fall off
In practice, in order to ensure that the electrode can hold the aluminum tube, the minimum diameter of the groove that holds the aluminum tube in the electrode is usually designed to be a little smaller than the outer diameter of the aluminum tube, so the outer diameter of this part after welding is smaller than that to be welded Aluminum tubes, especially when welding thin-walled copper-aluminum tubes, too small a groove diameter design for clamping aluminum tubes will make the inner diameter of the welded joints become elliptical, the quality standard will be lowered, and the problem will become more prominent

Method used

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  • Plug-in type copper aluminum pipe welded joint and method of producing the same
  • Plug-in type copper aluminum pipe welded joint and method of producing the same
  • Plug-in type copper aluminum pipe welded joint and method of producing the same

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specific Embodiment 1

[0021] refer to figure 1 , the embodiment of the present invention is as follows: select the same copper tube 2 and aluminum tube 12 of pipe outer diameter to carry out initial processing, be about to process the welded part of copper tube pipe end into welding tapered surface 6. Put a welding mandrel 1 in advance in the inside of the copper tube 2, and make the appearance of the welding mandrel 1 coincide with the tapered welding surface of the copper tube 2, and the copper tube 2 is placed in the internal pressure resistance pressure welding machine. The middle of the moving electrode 3; the port of the aluminum tube 12 does not need to be processed, and the wall thickness and diameter are kept as they are. Wavy texture7. Such as image 3 As shown, the nominal diameter D2 of the groove is the same as the outer diameter of the aluminum tube, the minimum diameter D1 of the groove is slightly smaller than the outer diameter of the aluminum tube, and the maximum diameter D3 is...

specific Embodiment 2

[0023] refer to image 3 , the welding tapered surface 6 of the above-mentioned copper tube 2 can also be a broken line welding surface 10, the diameter d at the broken line should be slightly larger than the inner diameter of the aluminum tube 12, which can reduce the resistance when inserting the copper tube when welding thin-walled copper and aluminum tubes , It is beneficial to prevent the deformation and instability of the copper tube, and forms a two-section fusion weld, and improves the welding fusion area and quality.

[0024] The welded joint of the plug-in copper-aluminum pipe prepared by the above method is characterized in that the aluminum pipe of the welded joint has a wave-shaped concave-convex pattern on the surface, referred to as the wave pattern.

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Abstract

The invention relates to an inserting copper-aluminum pipe welded joint and a method of fabrication thereof. A taper face of weld is arranged at the joint welding position of a copper pipe, and raised grains are arranged on the outer wall of an aluminum pipe. During welding, a mosaic block is arranged at the welding position of the fixed electrode; a groove is arranged in the mosaic block, and raised grains are prepared on the groove; and the nominal diameter of the groove which bears raised grains is identical with the outer diameter of the aluminum pipe. The aluminum fluid melted during welding can be filled in the raised grains of the groove of the mosaic block, so that the deformation of the aluminum pipe is avoided, and the quality and strength of the product are improved. By such welding method, the aluminum pipe can be clamped to avoid breaking off; in addition, the outer diameter of the welding position of the copper-aluminum pipe joint is kept identical with the outer diameter of the aluminum pipe.

Description

technical field [0001] The invention relates to a plug-in copper-aluminum pipe welding joint, in particular to a thin-wall plug-in copper-aluminum pipe welding joint. [0002] The invention relates to a welding method for a plug-in type copper-aluminum pipe welding joint, which can significantly improve the damage of the resistance welding electrode to the outer diameter of the welding joint during the welding process, and form an internal pressure plug-in type with novel structure and excellent quality. Copper-aluminum pipe welding joints have remarkable characteristics. Background technique [0003] Refrigerant is the working substance of the refrigeration cycle in the refrigeration device. In the circulation pipeline system using refrigerant as the cooling medium, the cooling effect is related to the amount of refrigerant. The refrigerant is recycled in the system. Leakage will lead to the loss of refrigerant inside the system, which will affect the cooling effect of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L13/02B23K11/02B23K11/30B23K101/06
Inventor 左铁军赵越孙德兴杨训
Owner 左铁军
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