Method for removing the thermal compression welding of copper-aluminum combined pipeline fitting under the assistance of rotary friction

Abstract

A method for the thermal compression welding of a copper-aluminum combined pipeline fitting with the assistance of rotary friction to remove an aluminium tube oxidation film relates to the field of thermal compression welding process and solving the problem that the prior connection method of the conventional aluminum tube has poor connection compactness and low finished product ratio due to the compact oxidation film in the used aluminum tube. The method comprises the following steps: the outer wall of one end of a copper pipe to be welded is processed into a tapered surface, the copper pipe is secured at a drill chuck of a drilling and milling machine while the aluminum pipe is secured on a clamp of the drilling and milling machine, one end with tapered surface of the copper pipe is inserted into one end of the aluminum pipe, and the sleeved section between the copper pipe and the aluminum pipe is heated up using an acetylene flame gun, when the temperature reaches 400-500 DEG C, the copper pipe is rotated and the other end of the copper pipe is pressurized so that the copper pipe is inserted into the aluminum pipe, and heating is ceased to accomplish total welding between the copper pipe and the aluminum pipe. The method in the invention is applied to welding the combined pipeline fittings in refrigeration products.

Description

technical field [0001] The invention relates to a method for hot-press welding of copper-aluminum composite pipeline parts assisted by rotating friction, in particular to a copper-aluminum pipe hot-press welding process using a drilling and milling machine as auxiliary welding equipment and applying flame heating. Background technique [0002] At present, the refrigeration industry uses a large number of copper pipes in its refrigerators, air conditioners and other products, but due to the high price of copper, it is difficult to reduce the cost of products. If part of the copper tubes can be replaced by aluminum tubes, the cost can be greatly reduced. For the refrigeration pipeline, only a part of it needs to withstand the action of specific load, temperature and medium, so copper tubes must be used, and other pipeline parts can be completely replaced by aluminum tubes. Aluminum alloy has the advantages of low density, high strength, corrosion resistance, high thermal cond...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor connection density and low yield due to the dense oxide film inside the aluminum tube used in the existing conventional copper-aluminum tube connection method, the present invention proposes a method that uses rotating friction to assist removal A method for thermocompression welding of copper-aluminum composite pipe fittings with an oxide film on an aluminum tube, the method is completed by the following steps:

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