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Preparation method of welded joint of aluminum pipes

A technology for welding joints and aluminum pipes, which is applied in welding equipment, pipes/pipe joints/fittings, resistance welding equipment, etc., can solve the problems of aluminum pipe joint oxidation and other problems, and achieve the effects of anti-seismic joints, no casting structure, and wide welding surface

Inactive Publication Date: 2013-10-16
OCEAN UNIV OF CHINA
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Problems solved by technology

[0007] In view of the problems and deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for preparing welded joints of aluminum tubes, which uses the principles of cold pressure welding, resistance heating, and high-temperature extension to eliminate oxidation on the surface of aluminum tubes. At the same time, it can solve the problem of oxidation of aluminum pipe joints under welding high temperature

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  • Preparation method of welded joint of aluminum pipes
  • Preparation method of welded joint of aluminum pipes
  • Preparation method of welded joint of aluminum pipes

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Embodiment Construction

[0028] The preparation method of the aluminum pipe welded joint of the present embodiment comprises the following steps:

[0029] The first step is shrinking forming: take two sections of aluminum tubes, use one of them as the insertion aluminum tube 2, insert one end of the aluminum tube 2 and shrink it to form a straight tubular port with stepped diameter reduction; the other section of the aluminum tube remains in its original shape as a sleeve Connect aluminum tube 1;

[0030] The second step, pretreatment: before welding, carry out surface treatment on the welding ends of the two sections of aluminum tubes, the treatment method is as follows: alcohol or acetone ultrasonic vibration cleaning→alkaline cleaning→acid cleaning→water washing;

[0031] The third step, positioning: put the sleeved aluminum tube 1 on the fixed electrode group 3, and fix it with a high-pressure cylinder; put the inserted aluminum tube 2 on the moving electrode 4, and extend the front end into the s...

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Abstract

The invention relates to a preparation method of a welded joint of aluminum pipes. The preparation method comprises the following steps: 1, performing necking formation; 2, performing pretreatment; 3, positioning; and 4, welding, wherein before welding, the welding end of one aluminum pipe is necked to form a step diameter-reducing straight pipe shape and the welding end is subjected to surface treatment; in the welding process, the welding part is subjected to argon protection, a moveable electrode pushes the necked aluminum pipe to the aluminum pipe on a fixed electrode, and a contact resistor is used for heating after electrifying, so welding of the aluminum pipes is realized. The preparation method provided by the invention has high efficiency and is suitable for batch production. According to the produced joint of the aluminum pipes, the weld joint has a fine and smooth tissue and has the tissue characteristic of the solid-phase weld joint; and the joint has good shock resistance and good sealing property and can be applied to pipeline connection of aircrafts.

Description

technical field [0001] The invention relates to an aluminum pipe welding joint used for connection in an aircraft oil pipeline, in particular to a preparation method for an aluminum pipe welding joint connected by resistance welding. Background technique [0002] At present, in the aircraft fuel pipeline system, aluminum materials are widely used due to their high strength and good economy. In the process of specific installation and use, a large number of aluminum pipes are required to be assembled and connected on site. The most commonly used methods are mechanical seals, brazing, and argon arc welding. The existing methods have the following shortcomings and deficiencies: [0003] 1. Disadvantages of mechanical seals: large joints and poor shock resistance; [0004] 2. Disadvantages of brazing: the joint is brittle, the shock resistance is poor, there is a potential difference between the weld and the base material, and corrosion is prone to occur in a humid environment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/00B23K11/34F16L13/02
Inventor 赵越李青溪左铁军王昕陈德娟
Owner OCEAN UNIV OF CHINA
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