Method of manufacturing inserted aluminum pipe welded joint

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...

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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

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