A preparation method and product of nuclear power high-temperature nickel-based alloy composite welding wire

A nickel-based alloy, composite welding wire technology, applied in welding equipment, metal processing equipment, welding medium and other directions, can solve the problems of poor molten metal fluidity, affecting the quality of welding seam forming, expensive welding wire, etc., to ensure high temperature plasticity. , The effect of reducing crack sensitivity and low cost

Active Publication Date: 2021-02-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, this brand of welding wire is expensive and has not been widely used in domestic nuclear power construction. In addition, FM-52MSS welding consumables also have other problems. The increase in alloying leads to poor fluidity of molten metal, which affects the quality of weld formation. At the same time, the composition segregation intensifies during solidification, and large heat input can easily lead to another kind of thermal crack, that is, the generation of solidification crack

Method used

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  • A preparation method and product of nuclear power high-temperature nickel-based alloy composite welding wire
  • A preparation method and product of nuclear power high-temperature nickel-based alloy composite welding wire
  • A preparation method and product of nuclear power high-temperature nickel-based alloy composite welding wire

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Effect test

Embodiment 1

[0045] (1) Pretreatment: Clean the surface of the high-temperature nickel-based alloy welding wire, polish the surface with sandpaper, and then polish it, and then in 50°C sodium hydroxide (20g / L), trisodium phosphate (30g / L ) and sodium silicate (30g / L) mixed solution for 10min. Finally, electrolytic polishing was carried out in the mixed acid of 80% acetic acid plus 20% perchloric acid, the electrolytic voltage was 27V, and the electrification was 7s to obtain welding wire I;

[0046] (2) Nickel plating: prepare Watt type electrolyte, electroplating solution comprises nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, nickel layer is electroplated on the surface of welding wire I, makes welding wire II, and electroplating process parameter is current density 3A / dm 2 , electroplating time 10min, electroplating temperature 45 ℃, stirring speed 300r / min;

[0047] (3) Plating TiC: prepare TiC electroplating solution, TiC electroplating solution includes: TiC...

Embodiment 2

[0058] (1) Pretreatment: Clean the surface of the high-temperature nickel-based alloy welding wire, polish the surface with sandpaper, and then polish it, and then in 50°C sodium hydroxide (20g / L), trisodium phosphate (30g / L ) and sodium silicate (30g / L) mixed solution for 10min. Finally, electrolytic polishing was carried out in the mixed acid of 80% acetic acid plus 20% perchloric acid, the electrolytic voltage was 27V, and the electrification was 7s to obtain welding wire I;

[0059] (2) Nickel plating: prepare a Watt-type electrolyte, and the electroplating solution includes 400g / LNiSO 4 , 45g / LNiCl 2 , 50g / L H 3 BO 3 , the balance is water, electroplating a nickel layer on the surface of welding wire I to produce welding wire II, and the electroplating process parameters are current density 3A / dm 2 , electroplating time 10min, electroplating temperature 45 ℃, stirring speed 300r / min;

[0060] (3) Plating TiC: prepare TiC electroplating solution, TiC electroplating so...

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Abstract

The invention discloses a preparation method of high-temperature nickel-based alloy composite welding wire for nuclear power and its products, belonging to the field of welding technology, comprising the following steps: cleaning the surface of the high-temperature nickel-based alloy welding wire, followed by mechanical grinding, polishing, and alkali cleaning Oil and electropolishing treatment to produce welding wire I; electroplating nickel layer on the surface of welding wire I to produce welding wire II; electroplating TiC coating on the nickel layer of welding wire II to produce welding wire III; electroplating on the TiC coating of welding wire III The nickel layer is used to prepare a nuclear power high-temperature nickel-based alloy composite welding wire; the nuclear power high-temperature nickel-based alloy composite welding wire prepared by the invention has low cost and high DDC crack resistance.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a preparation method of high-temperature nickel-based alloy composite welding wire for nuclear power plants and a product thereof. Background technique [0002] Nickel-based superalloy Inconel690 is a key structural material for nuclear power plant core equipment pressure vessels, heat dissipation evaporators, etc. It has excellent high-temperature performance, corrosion resistance, and oxidation resistance. Poor thermal expansion coefficient, poor high temperature fluidity, etc., it is very easy to form coarse columnar crystals during welding, and produce intergranular thermal cracks, especially a microscopic thermal crack of intergranular cracking - high temperature loss of extension cracks ( DDC). [0003] There are many factors affecting DDC, such as alloy system, precipitated carbides, intergranular elements, degree of tortuosity of grain boundaries, grain boun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/40
CPCB23K35/0261B23K35/40B23K35/404
Inventor 陈静青莫涛张鹏举吴俣白文倩陈辉
Owner SOUTHWEST JIAOTONG UNIV
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