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Welding method of dissimilar metals and its products and applications

A technology of dissimilar metals and welding methods, applied in welding/welding/cutting items, applications, welding equipment, etc., can solve the problems of high welding process requirements, over-burning and other problems, achieve low welding process requirements, reduced weld bead brittleness, The effect of improving mechanical properties

Active Publication Date: 2017-11-07
佛山晓世科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the direct heating of copper and iron to melting requires precise heat distribution, high requirements for welding technology, and overburning is prone to occur.

Method used

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  • Welding method of dissimilar metals and its products and applications
  • Welding method of dissimilar metals and its products and applications
  • Welding method of dissimilar metals and its products and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 , figure 2 As shown, in this embodiment, a copper pipe 1 and an iron pipe 2 are adopted, and the copper pipe 1 is sleeved on the outside of the iron pipe 2 to form a weld. The wall thickness t of the copper pipe 1 is 1mm, and the wall thickness of the iron pipe is 0.8mm. The socket depth of the two is ≥1.5mm. After the copper tube 1 is socketed on the iron tube 2, the unilateral gap is 0-0.4mm. Since the expansion coefficient of copper is larger than that of iron, even if the unilateral gap is 0, once the copper tube 1 is heated and expanded, it will still contact the outer wall of the iron tube 2. A gap greater than 0 is formed.

[0032]Argon arc welding is used for welding, and the welding temperature is lower than the melting temperature of iron and higher than the melting temperature of copper. In this embodiment, the welding temperature is about 1200°C. The edge of the copper pipe 2 to be welded is melted as solder to seal the weld seam, and a...

Embodiment 2

[0038] Such as image 3 , Figure 4 As shown, in this embodiment, a copper plate 4 and a stainless steel plate 5 are used, and the edge of the copper plate 4 is overlapped with the edge of the stainless steel plate 5 to be welded. The thickness t of the copper plate 4 is 3 mm, and the thickness t of the stainless steel plate 5 is 2 mm. The overlapping depth of the two is ≥1.5mm.

[0039] Argon arc welding is used for welding, and the welding temperature is lower than the melting temperature of iron and higher than the melting temperature of copper. In this embodiment, the welding temperature is about 1200°C. The edge of the copper plate 4 to be welded is melted as solder to seal the weld, and after cooling, a smooth slope with a certain radian is formed. The height of the slope is h=3mm, and the molten copper part is also filled into the weld. The width of the track is more than 3mm, so that the dissimilar metal plates including the copper plate 4 and the stainless steel pl...

Embodiment 3

[0042] When welding, nickel-based solder with a nickel content of more than 8% is used to melt the nickel solder and copper to form a mixture, which penetrates into the iron together to form a solid solution.

[0043] Others are with embodiment 1.

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Abstract

The invention relates to a welding method, a product and an application of a dissimilar metal. The welding method of the dissimilar metal comprises a high-melting-point material to be welded and a low-melting-point material to be welded, the high-melting-point material and the low-melting-point material are mutually overlapped or connected in a sleeving manner to form a welding seam, the welding seam is welded by the aid of electric arc welding, electron beam welding, laser welding or high-frequency welding, the welding temperature is lower than the melting temperature of the high-melting-point material and higher than the melting temperature of the low-melting-point material, the low-melting-point material is melted to serve as a welding material to seal the welding beam and cooled to form a welding channel, and the width L of the welding channel is larger than or equal to 1.5mm. The melted low-melting-point material directly serves as the welding material to seal the welding beam to form the welding channel with a certain width, so that the melted low-melting-point material and the high-melting-point material are mutually permeated in a certain area range to form solid solution, the permeation quantity of high-melting-point metal to low-melting-point metal is controlled, overall strength sufficiently meets use requirements, more importantly, frangibility of the welding channel is reduced, mechanical properties are improved, the requirements for a welding process are low when welding is performed, and the welding method is easier to control.

Description

technical field [0001] The present invention relates to the field of welding. Background technique [0002] In the field of welding, it is generally necessary to use solder for the welding connection between two dissimilar metals, which is due to the difference in physical properties of the dissimilar metals themselves. For example, copper and iron, the melting point of copper is about 1000°C, and the melting point of iron is about 1500°C. [0003] Current copper-iron welding is generally by flame brazing with silver solder. When flame brazing is used, the copper and iron materials do not melt, and the silver solder is heated and melted by the flame to fill the gap between the copper and iron materials and interpenetrate with the copper and iron materials to form copper atoms in the solder. The copper and iron sides infiltrate to form a partial solid solution, and the copper and iron are welded together after cooling. The soldering temperature during this soldering is hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/12B23K103/18B23K101/18B23K101/06
CPCB23K31/12B23K2101/06B23K2101/185B23K2103/22
Inventor 温爱春
Owner 佛山晓世科技服务有限公司
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