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Diffusion welding method of copper alloy and stainless steel

A stainless steel and copper alloy technology, applied in the field of diffusion welding, can solve problems such as low joint strength, reduce the overall cost, increase the effective welding area, and improve the production efficiency.

Inactive Publication Date: 2011-06-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency of low joint strength when welding copper alloy and stainless steel by the instantaneous liquid phase diffusion welding method in the prior art, the present invention provides a copper alloy and stainless steel diffusion welding method, which adopts tin bronze as the welding intermediate layer for diffusion welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Diffusion welding of T2 copper alloy and 1Cr18Ni9Ti stainless steel.

[0018] Tin bronze QSn6.5-0.1 foil material 6 with a thickness of 0.1 mm is used as the connecting material for the intermediate layer. use 2000 # The surface of the QSn6.5-0.1 foil 6 and the surface to be welded of the T2 copper alloy 2 and the 1Cr18Ni9Ti stainless steel 3 were polished with SiC sandpaper. Then immerse QSn6.5-0.1 foil 6, T2 copper alloy 2 and 1Cr18Ni9Ti stainless steel 3 in acetone solution, ultrasonically clean for 5 minutes, and dry with cold air. The above materials are clamped: the QSn6.5-0.1 foil material 6 is placed between the T2 copper alloy 2 and the 1Cr18Ni9Ti stainless steel 3 . Put the workpiece to be welded into the vacuum furnace, and place it between the upper indenter 1 and the lower indenter 4 in the vacuum diffusion welding furnace, between the upper indenter 1 and T2 copper alloy 2, the lower indenter 4 and 1Cr18Ni9Ti stainless steel 3 A solder mask l...

Embodiment 2

[0020] Example 2: Diffusion welding of H96 copper alloy and 00Cr19Ni10 stainless steel.

[0021] Tin bronze QSn7-0.2 foil material 6 with a thickness of 0.1mm is used as the connecting material of the intermediate layer. use 2000 # The surface of the QSn7-0.2 foil 6 and the surface to be welded of the H96-Cu copper alloy 2 and the 00Cr19Ni10 stainless steel 3 were polished with SiC sandpaper. Then immerse QSn7-0.2 foil 6, H96 copper alloy 2 and 00Cr19Ni10 stainless steel 3 in acetone solution, ultrasonically clean for 5 minutes, and dry with cold air. The above materials are clamped: the QSn7-0.2 foil material 6 is placed between the H96 copper alloy 2 and the 00Cr19Ni10 stainless steel 3 . Put the workpiece to be welded into the vacuum furnace, and place it between the upper indenter 1 and the lower indenter 4 in the vacuum diffusion welding furnace, between the upper indenter 1 and H96 copper alloy 2, the lower indenter 4 and 00Cr19Ni10 stainless steel 3 A solder mask lay...

Embodiment 3

[0023] Embodiment 3: Diffusion welding of QSn4-0.3 copper alloy and 0Cr17Ni12Mo2 stainless steel.

[0024] Tin bronze QSn8-0.3 foil material 6 with a thickness of 0.1mm is used as the connecting material of the intermediate layer. use 2000 # The surface of the QSn8-0.3 foil 6 and the surface of the QSn4-0.3 copper alloy 2 and the 0Cr17Ni12Mo2 stainless steel 3 to be welded were polished with SiC sandpaper. Then immerse QSn8-0.3 foil 6, QSn4-0.3 copper alloy 2 and 0Cr17Ni12Mo2 stainless steel 3 in acetone solution, ultrasonically clean for 5 minutes, and dry with cold air. The above materials are clamped: the QSn8-0.3 foil material 6 is placed between the QSn4-0.3 copper alloy 2 and the 0Cr17Ni12Mo2 stainless steel 3 . Put the workpiece to be welded into the vacuum furnace, and place it between the upper indenter 1 and the lower indenter 4 in the vacuum diffusion welding furnace. 3 place a solder resist layer 5 between them. Apply a pre-pressure of 0.5MPa to the workpiece t...

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Abstract

The invention discloses a diffusion welding method of copper alloy and stainless steel, which is used for increasing the strength of a welded joint of the copper alloy and the stainless steel. The method thereof comprises the following steps that: a processed tin bronze foil is placed between the copper alloy to be welded and the stainless steel; then the whole tin bronze foil is placed into a vacuum diffusion welding furnace; the temperature is raised from room temperature to 880 to 920 DEG C, the pressure is applied by 4 to 8MPa, and the temperature is preserved for 30 to 60min; and coolingis carried out with the furnace after the temperature preservation is finished. Since the tin bronze is adopted for carrying out diffusion welding on a middle layer, a zigzag welding interface is formed by using the characteristic that a Cu-Sn liquid phase is formed by clustering of Sn element in the tin bronze toward the welding interface as well as the corrosion effect of the liquid phase to the stainless steel crystal boundary, thus improving the effective welding area and leading the tensile strength of the joint to be improved to be more than 93 percent from 80 percent to 88 percent of the strength of the copper alloy base material of the prior art.

Description

technical field [0001] The invention relates to a diffusion welding method, in particular to a diffusion welding method of copper alloy and stainless steel. Background technique [0002] The welding of copper alloy and stainless steel is widely used in the manufacture of components with requirements such as wear resistance, thermal conductivity and electrical conductivity. [0003] Document 1 "Influence of brazing conditions on the strength of brazed joints of aluminum dispersion-strengthened copper to 316 stainless steel, Nishi H, Kikuchi K.Journal of Nuclear Materials, 258-263 (1998): 281-288." discloses an Al 2 o 3 Dispersion strengthened copper alloy and 316 stainless steel brazing method, the tensile strength of the joint welded by this method is equivalent to the strength of the copper alloy to be welded, but the intermediate layer connection material used is Au80Cu20 alloy containing a large amount of precious metals, and the intermediate layer alloy It is not a gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/22
Inventor 熊江涛李京龙张赋升李鹏李雪飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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