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Flash welding method for dissimilar metal

A technology of dissimilar metals and welding methods, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve problems such as overburning of copper pipes, occurrence of dirty, copper and iron pipes that cannot be welded, and improve welding quality , good self-fusion effect

Inactive Publication Date: 2014-04-02
ZHUJI SIBEIDA MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is welded at about 1000°C, the iron cannot be melted, and the welding state at this time is that the molten copper is only attached to the surface of the iron pipe end surface, and no crystals of copper and iron have been formed. average strength
And if it is welded at about 1500°C, the copper pipe will be overheated and dirty, and the copper and iron pipes cannot be welded.

Method used

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  • Flash welding method for dissimilar metal
  • Flash welding method for dissimilar metal
  • Flash welding method for dissimilar metal

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, this embodiment is the butt welding of the copper pipe 11 and the iron pipe 22.

[0029] There is no preheating of the pipe before welding, but the thickness of the iron pipe 22 is about 20%-50% less than that of the copper pipe 11. At the beginning of welding, after the copper tube 11 and the iron tube 22 are assembled in the clamps of the secondary connection of the welding transformer, a large current is applied to them, and the copper tube 11 and the iron tube 22 quickly contact each other and form a closed circuit. Open the circuit to form an intermittent flash, which causes the butt end to generate high heat until the butt end is melted; when the length of the butt end being melted reaches the set melting length, the upsetting force is quickly applied to complete the welding of the copper pipe 11 and the iron pipe 22.

Embodiment 2

[0031] Such as figure 2 As shown, this embodiment is the butt welding of the copper pipe 11 and the iron pipe 22.

[0032] The iron pipe 22 and the copper pipe 11 have the same thickness, but the joint 3 of the iron pipe 22 is cut into a bevel, so that the part that needs to be melted is about 1 / 3 less than that of the copper pipe 22. No preheating of the pipe before welding. The welding operation is the same as in Example 1.

Embodiment 3

[0034] Such as image 3 As shown, in this embodiment, the copper tube 11 and the iron tube 22 are butt welded.

[0035] The thickness of the iron pipe 22 is about 1 / 3 thicker than that of the copper pipe 11. The iron pipe 22 is preheated to 950±50°C before welding. The welding operation is the same as in Example 1.

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Abstract

The invention relates to a flash welding method for dissimilar metal. According to the dissimilar metal, the mass of a portion to be melted through high-melting metal is less than that of a portion to be melted through low-melting metal, or the high-melting metal is preheated before welding, and the high-melting metal required heat for melting the portion is controlled to be reduced to be 0.8 to 1.2 times of the low-melting metal required heat for melting the portion. According to the flash welding method for the dissimilar metal which is welded through a flash welding technology, heat is uniformly distributed to the dissimilar metal to be welded when the flash welding is performed and the dissimilar metal achieves the melting temperature synchronously, good self-melting is achieved, solder is not needed, and meanwhile the welding quality is improved due to the facts that the mass of the portion to be melted through the high-melting metal is reduced and or the high-melting metal is performed preheating before welding.

Description

Technical field [0001] The invention relates to the field of welding. Background technique [0002] In the field of welding, for dissimilar metals, solder is generally required, which is caused by the difference in physical properties of dissimilar metals. [0003] Chinese patent application 201210589384.6 discloses a compressor exhaust pipe, in which a copper pipe section and an iron pipe section are butt welded by flash welding without solder. The preparation process is: a. Preheating: After the copper pipe section and the iron pipe section of the compressor exhaust pipe are assembled in the clamps of the secondary connection of the welding transformer, a large current is applied to the copper pipe section and the iron pipe section. Multiple rapid contacts are closed, and then quickly separated into an open circuit, forming intermittent flashes, causing the butt end to form high heat until the butt end is melted; b. Upsetting: When the length of the butt end being melted reaches...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K11/20
CPCB23K11/04B23K11/20B23K2103/18
Inventor 斯壮伟
Owner ZHUJI SIBEIDA MACHINERY CO LTD
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