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Method of manufacturing inserted aluminum pipe welded joint

A welding joint and plug-in technology, which is applied in the direction of welding equipment, welding equipment, welding medium, etc., can solve the problems of high activation temperature, low welding efficiency, complicated brazing process, etc., and achieve increased working pressure and roundness , limit the effect of splash overflow

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

[0003] In the refrigeration industry, aluminum tubes, as the most ideal material to replace copper tubes, have attracted more and more attention. However, the welding efficiency between aluminum tubes is very low. At present, argon arc welding is recognized as the best welding method between aluminum tubes. Welding method, but it has disadvantages such as not suitable for thin tubes, thin-walled tubes, and limited joint positions; aluminum tubes can also be connected by using NOCOLOK as a brazing flux to complete the connection, but the NOCOLOK brazing process is complicated and difficult to operate Large, too high activation temperature, especially unfavorable for automatic welding of aluminum evaporators with fins and dense pipes
[0004] In short, due to the easy formation of oxide film on aluminum, especially in the refrigeration industry, it is difficult to achieve high-efficiency mechanized welding, which limits the application of aluminum tubes in the refrigeration industry

Method used

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  • Method of manufacturing inserted aluminum pipe welded joint
  • Method of manufacturing inserted aluminum pipe welded joint
  • Method of manufacturing inserted aluminum pipe welded joint

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specific Embodiment 1

[0019] refer to figure 1 , one embodiment of the present invention is: select the hard aluminum tube 2 and the soft aluminum tube 12 with the same outer diameter, and process the welding part of the hard aluminum tube 2 tube end into a shape with an outer diameter slightly smaller than the inner diameter of the soft aluminum tube 12 To weld the tapered surface, a welding mandrel 1 is preliminarily placed inside the hard aluminum tube 2, and the hard aluminum tube 2 together with the welding mandrel 1 is placed on the moving electrode 3 of the internal pressure resistance pressure welding machine. The end of the soft aluminum tube 12 is not further processed, and the wall thickness and diameter are kept as they are. The soft aluminum tube 12 is placed on the fixed electrode 5 of the internal pressure resistance pressure welding machine. In order to improve the welding quality, titanium alloy mosaic pieces 4 are inlaid on the fixed electrode 5 and the moving electrode 3 respecti...

specific Embodiment 2

[0020] refer to figure 2 , the tapered welding surface of the hard aluminum tube 2 can also be in the shape of a broken line such as figure 2 In middle 10, the diameter d of the broken line should be slightly larger than the inner diameter of the soft aluminum tube 12, which reduces the resistance of the soft aluminum tube to the insertion of the hard aluminum tube, helps prevent the deformation and instability of the hard aluminum tube, and forms a two-stage fusion Weld seam, and improve welding fusion area and quality.

[0021] The welded joint of the aluminum pipe prepared by the above method has a wave-shaped concave-convex pattern on the surface of the soft aluminum pipe of the welded joint, referred to as the wave pattern.

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Abstract

The invention relates to a preparation method of spliced type aluminum pipe welding joints, which is characterized in that a welding part at the pipe end of a hard state aluminum pipe is processed to be a conical welding surface; a welding mandrel is inserted into the hard state aluminum pipe in advance before the welding; the hard state aluminum pipe with the inserted welding mandrel, a soft state aluminum pipe are fixed at a movable electrode and a fixed electrode respectively; the electrodes are moved to drive the hard state aluminum pipe to be inserted into the soft state aluminum pipe movably, meanwhile, the electrodes are electrified until the conical welding surface of the hard state aluminum enters the soft state aluminum pipe completely. The welding mandrel can improve the working pressure of the aluminum pipe joints and the roundness of the soft state aluminum pipe during the propelling process of the welding initial stage; the welding mandrel can restrict the overflowing of spattering matters during the electrifying welding process.

Description

technical field [0001] The invention relates to a preparation method of a plug-in type aluminum tube welded joint, which can complete high-density welding between thin-walled aluminum tubes, and form a plug-in type aluminum tube welded joint with novel structure and excellent quality, which has remarkable advantages features. Background technique [0002] Refrigerant is the working substance of the refrigeration cycle in the refrigeration device. In the circulation pipeline system with 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 product and eventually cause the cooling product to lose its cooling performance. Therefore, it is very necessary to ensure the tightness of the pipeline system, especially the tightness of the pipeline welded joints. [0003] In the refrigeration in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/00B23K11/36B23K11/30B23K33/00B23K35/04B23K101/06
Inventor 左铁军赵越孙德兴杨训
Owner 左铁军
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