Composite solder for brazing high-nitrogen steel and preparation method thereof

A technology of composite brazing filler metal and high nitrogen steel is applied in the field of brazing filler metals in the field of metal welding to achieve the effects of improving connection strength and mechanical properties, enhancing joint strength and enhancing mechanical properties

Active Publication Date: 2019-01-01
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the difficulties in selecting the ratio of weld depth and width and the high In order to solve the serious problem of nitrogen element loss in nitrogen steel, the invention provides a composite solder for high nitrogen steel brazing and its preparation method. When the composite solder of the present invention is used to braze high nitroge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of composite solder for high-nitrogen steel brazing, according to the weight ratio, its active ingredient is composed of 25 parts of Pd, 8 parts of Ni, 36 parts of Cr, 2.5 parts of nickel-coated graphene or vanadium-coated graphite Alkene, 5.6 parts of Mo, 23 parts of Mn, 7 parts of Re, 3 parts of Si, 2 parts of B and 0.35 parts of Nb;

[0057] The preparation method of above-mentioned composite solder is as follows:

[0058] 1) Weigh the alloy powder containing the above ingredients, and mix it with nickel-coated graphene or vanadium-coated graphene powder to form a mixed powder, and the weight ratio of each component in the mixed powder meets the above requirements;

[0059] 2) According to the weight ratio, weigh 15 parts of distilled water, 15 parts of water-based binder and 5 parts of acetone to mix, and stir evenly until no precipitation occurs to form a mixed solution, then weigh 45 parts to prepare in step 1) mixed powder, and added to the mixed solution...

Embodiment 2

[0077] A kind of composite solder for high-nitrogen steel brazing, according to the weight ratio, its active ingredient is composed of 28 parts of Pd, 13 parts of Ni, 41 parts of Cr, 3.9 parts of nickel-coated graphene or vanadium-coated graphite Alkene, 6.8 parts of Mo, 27 parts of Mn, 11 parts of Re, 6 parts of Si, 4.5 parts of B and 0.6 parts of Nb;

[0078] The preparation method of above-mentioned composite solder is as follows:

[0079] 1) Weigh the alloy powder containing the above ingredients, and mix it with nickel-coated graphene or vanadium-coated graphene powder to form a mixed powder, and the weight ratio of each component in the mixed powder meets the above requirements;

[0080] 2) According to the weight ratio, weigh 30 parts of distilled water, 30 parts of water-based binder and 12 parts of acetone to mix, and stir evenly until no precipitation occurs to form a mixed solution, then weigh 70 parts to prepare in step 1) mixed powder, and added to the mixed solu...

Embodiment 3

[0098] A kind of composite solder for high-nitrogen steel brazing, according to the weight ratio, its active ingredient is composed of 26.5 parts of Pd, 10.5 parts of Ni, 38.5 parts of Cr, 3.2 parts of nickel-coated graphene or vanadium-coated graphite Alkene, 6.2 parts of Mo, 25 parts of Mn, 9 parts of Re, 4.5 parts of Si, 3.25 parts of B and 0.45 parts of Nb;

[0099] The preparation method of above-mentioned composite solder is as follows:

[0100] 1) Weigh the alloy powder containing the above ingredients, and mix it with nickel-coated graphene or vanadium-coated graphene powder to form a mixed powder, and the weight ratio of each component in the mixed powder meets the above requirements;

[0101] 2) According to the weight ratio, weigh 22.5 parts of distilled water, 22.5 parts of water-based binder and 8.5 parts of acetone to mix, and stir evenly until no precipitation occurs to form a mixed solution, then weigh 57.5 parts of the preparation in step 1) mixed powder, and...

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PUM

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Abstract

The invention relates to a composite solder for brazing high-nitrogen steel and a preparation method thereof. The composite solder is prepared from the effective components including Pd, Ni, Cr, nickel-plated graphene or vanadium plated graphene, Mo, Mn, Re, Si, B and Nb. In the brazing process by using the composite solder, high-nitrogen steel base metal is hardly melted, so that nitrogen is notlost. The defect of apore in the traditional welding mode is overcome, and the nitrogen almost has no loss. Moreover, as the high-nitrogen steel base metal is hardly melted, no deformation can occur,the connection strength and mechanical properties of a joint are improved to some extent, and awelded joint is well formed.

Description

technical field [0001] The invention relates to a brazing filler metal in the field of metal welding, in particular to a composite brazing filler metal used for high nitrogen steel brazing and a preparation method thereof. Background technique [0002] High-nitrogen steel has properties such as corrosion resistance, oxidation resistance, wear resistance and excellent mechanical properties. These excellent properties make it one of the important materials in the manufacture of aviation, ship and weapon equipment, and welding technology determines its application scope. important process link. Due to the high nitrogen content of high-nitrogen steel itself, the welding porosity problem is often caused by the precipitation of base metal nitrogen during the welding process. The precipitation of nitrides in the heat-affected zone is a major loss of solid-solution nitrogen, and induces the appearance of other hard and brittle phases, thereby weakening the weld. Material properties...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/40
CPCB23K35/24B23K35/40
Inventor 王星星李帅郑鹏杜全斌宋晓国石磊
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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