Method for 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 under the assistance of rotary friction is disclosed, relating to the field of thermal compression welding process and solving the problem that the used aluminum pipe has an interior oxide film which is hardly removable and also has low production efficiency and high cost when professional welding equipmentis used to weld the copper-aluminum combined pipeline fitting in the prior art; the method comprises the steps that: 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 surfaceof 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 temperaturereaches 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...

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Problems solved by technology

[0004] The present invention solves the problem that in the prior art, when professional welding equipment is used to weld copper-aluminum composite pipe fittings, the dense oxide film inside the aluminum tube used is difficult to remove, resulting in low yield and low production efficiency in production. In order to solve the problem of high cost, a method of hot-press welding of copper-aluminum composite piping parts assisted by rotating friction is proposed, which is completed by the following steps:

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