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An ultrasonic-assisted DC resistance brazing aluminum alloy method

A DC resistance, ultrasonic-assisted technology, used in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve problems such as blasting, affecting the formation of welded joints, and inability to provide large currents to increase energy. Input, ensure grain refinement, reduce the effect of heat affected zone

Inactive Publication Date: 2020-06-02
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The existing ultrasonic-assisted AC resistance brazing technology cannot provide a large current, otherwise a violent explosion will occur during the welding process, and a large amount of molten solder will be ejected out of the weld with the explosion, seriously affecting the quality of the welded joint. form

Method used

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  • An ultrasonic-assisted DC resistance brazing aluminum alloy method
  • An ultrasonic-assisted DC resistance brazing aluminum alloy method
  • An ultrasonic-assisted DC resistance brazing aluminum alloy method

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specific Embodiment

[0031] The following are specific embodiments of the present invention, including the following steps:

[0032] one. Preparation before welding:

[0033] Before welding, process a 6mm×8mm arc groove with a depth of 0.15mm at the joint of the lower workpiece, and polish the surface of the upper and lower workpieces to be welded to remove the continuous and dense oxide film on the aluminum alloy surface, and then wipe it with cotton dipped in acetone solution Remove grease and other impurities on the surface of the workpiece to be welded, and then clean the surface of the workpiece to be welded with absolute ethanol to remove residual acetone solution; combine the previous practical experience and existing equipment, install the upper and lower workpieces on the existing insulating sliding device, Use bolts and insulating caps to connect the assembly holes on the base metal and the positioning holes of the upper insulation, lower insulation plate, upper slide plate, and lower p...

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Abstract

The invention discloses an ultrasound-assisted direct-current resistance aluminum alloy brazing method. The method comprises the steps that firstly, an aluminum alloy plate and a groove in a joint aremachined, the aluminum alloy plate is mounted on an insulation sliding welding clamp, and an electrode and a workpiece are connected through a bolt and an insulation cap (2); secondly, foil-piece-shaped brazing filler metal is placed in the groove to be welded, through a steel wire rope (3), a loading balance weight is fixed to the top end of an upper workpiece, a pressure sensor is used for carrying out real-time precise measuring on pressure changes; thirdly, direct-current resistance brazing parameters are set, the first-stage welding current is 3.5 to 4 KA, the welding time ranges from 500 ms to 900 ms, the interval time ranges from 100 ms to 500 ms, the second-stage welding current ranges from 7.5 to 9.9 KA, the welding time is 1 to 2s, the lower workpiece joint surface is subject toultrasound operation, and the welding pressure is kept constant at 80 N; fourthly, a direct-current resistance device is started, and a welding part is subject to air cooling to the room temperature.

Description

technical field [0001] The invention relates to pressure brazing technology, in particular to the brazing technology intersected by ultrasonic metal brazing and resistance brazing technology. Background technique [0002] Aluminum alloy has the advantages of low density, high thermal conductivity and electrical conductivity, strong corrosion resistance, no stress corrosion tendency and good process performance, and has an increasingly important position in modern industrial materials. Due to the continuous and dense oxide film on the surface of aluminum alloy, the further application of aluminum alloy in material processing is limited. Brazing is regarded as an important method for joining aluminum alloys due to its advantages such as small welding deformation, convenient operation, and high dimensional accuracy. However, on the one hand, the existing brazing method has a large amount of energy input and uneven heat distribution, and a brazed joint with good comprehensive p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00B23K1/06B23K1/20B23K103/10
CPCB23K1/0004B23K1/06B23K1/20B23K1/206
Inventor 吴炜杰俞伟元陈玮烨林巧力刘英宗李富祥邢春晓孙学敏吴保磊孙军刚雷震
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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