Electric resistance welding method

A technology of resistance welding and electric current, which is applied in the resistance welding field of welding copper or copper alloy and steel or steel alloy, can solve the problems of high welding cost, poor welding environment and low efficiency, and achieve the effect of meeting the sealing and strength requirements

Active Publication Date: 2008-12-10
HERON INTELLIGENT EQUIP CO LTD
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Problems solved by technology

[0002] At present, in the field of metal welding, most of the welding between ferrous metals such as iron and steel and non-ferrous metals such as copper adopts the method of flux and flame brazing, that is, adding solder (silver copper) between copper and iron. Then use the high-temperature flame of oxygen and acetylene to melt the solder to achieve the purpose of welding. There are also composite materials made of iron on copper for welding, but these welding methods have disadvantages such as low efficiency, high welding cost, and poor welding environment.

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Embodiment Construction

[0026] A resistance welding method of the present invention can be used for welding copper or copper alloy pipe fittings and iron or iron alloy plate parts or shells, refer to figure 1 The pressure and current waveform diagram in the welding process is shown. When welding, the upper electrode tip presses the metal pipe, and the lower electrode tip presses the metal shell or plate. The welding process includes the following steps:

[0027] (1) Installing the welding workpiece;

[0028] (2) Preset the pressure for the first time on the two welding objects through the upper electrode tip and the lower electrode tip;

[0029] (3) Maintain the preset pressure, use the first intermediate frequency pulse current for pre-welding, and stop the pre-welding after welding and pressing the two welding objects to form a good conductor for a period of time;

[0030] (4) Apply a second pressure to the two welding objects;

[0031] (5) Keep the pressure constant, increase the current at the ...

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Abstract

The invention discloses a resistance welding method for welding the copper or copper alloy and the steel or steel alloy, which adopts general principles of the resistance welding to carry out the spot welding or the loop projection welding of the copper or the copper alloy and the steel or the steel alloy to obtain complete liquid phase nuggets by using the technique of applying pulse currents and pressures by sections on special electrode tips of the resistance welding and a special welding power, and the real welding can be realized, wherein, the welding power provides direct current for welding and the discharging time is 110ms to 280ms, the maximum current is 36KA to 280KA, the current frequency before the rectification is 1000Hz, 1200Hz or 1500Hz, the welding current between work pieces and the electrode tips is the direct current, and the pressure is 1 to 5.9Kgf / cm<2>.

Description

technical field [0001] The invention relates to a resistance welding method, in particular to a resistance welding method for welding copper or copper alloy and steel or steel alloy. Background technique [0002] At present, in the field of metal welding, most of the welding between ferrous metals such as iron and steel and non-ferrous metals such as copper adopts the method of flux and flame brazing, that is, adding solder (silver copper) between copper and iron. Then use the high-temperature flame of oxygen and acetylene to melt the solder to achieve the purpose of welding. There are also composite materials on copper and iron for welding, but these welding methods have disadvantages such as low efficiency, high welding cost, and poor welding environment. [0003] Resistance welding is to use the resistance heat generated by the resistance of the metal to be welded through the current, and at the same time apply a certain pressure to the metal to be welded to achieve the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/02B23K11/34B23K103/22
Inventor 邹春芽邹春华
Owner HERON INTELLIGENT EQUIP CO LTD
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