Flux-cored wire for welding stainless steel used in high-temperature environment

A technology of flux-cored welding wire and high temperature environment, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of increased production cost, decreased toughness and plasticity, difficulty in component adjustment, etc.

Active Publication Date: 2021-12-10
BEIJING JINWEI WELDING MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for the welding of stainless steel in high temperature environment and stainless steel and dissimilar steel, solid welding wire and welding rod are mainly used. Solid welding wire is generally welded by argon arc welding, which has problems such as low efficiency and difficult composition adjustment. Sometimes even high-alloy welding materials are used. The production cost is greatly increased, and the mechanical propert

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: Preparation of flux-cored welding wire

[0066] Flux-cored welding wire for high-temperature heat treatment of stainless steel welding, which is made by filling flux-core powder in a stainless steel (309 stainless steel) strip with a filling rate of 21% and rolling. The mass composition ratio of the flux-core powder is as follows: 26 parts Metal chromium powder, 18.2 parts of metal nickel powder, 3.6 parts of medium carbon ferromanganese, 4.6 parts of chromium nitride, 24 parts of rutile, 4 parts of silicon calcium barium alloy, 7 parts of sillimanite, 2 parts of fluorite, 2.8 parts of rare earth fluoride , 6 parts of magnesia, 1.8 parts of aluminum powder.

[0067] After being rolled and drawn by the flux-cored wire production line, the flux-cored wire uses a variety of shielding gases (100% CO 2 Gas, 80%Ar+20%CO 2 Mixed gas and 100% Ar) were used to weld 309 stainless steel respectively, and the mass percentages of the chemical components of the deposi...

Embodiment 2

[0068] Embodiment 2: Preparation of flux-cored welding wire

[0069] Flux-cored welding wire for high-temperature heat treatment of stainless steel welding, which is made by filling flux-core powder in a stainless steel (309 stainless steel) strip with a filling rate of 20% and rolling. The mass percentage of the flux-core powder is as follows: 27.5 parts Metal chromium powder, 17.5 parts of metal nickel powder, 4.1 parts of medium carbon ferromanganese, 2.5 parts of chromium nitride, 20 parts of rutile, 3 parts of silicon calcium barium alloy, 5.7 parts of sillimanite, 4 parts of fluorite, 4 parts of rare earth fluoride , 5 parts of magnesia, 3 parts of aluminum powder.

[0070] After being rolled and drawn by the flux-cored wire production line, the flux-cored wire uses a variety of shielding gases (100% CO 2 Gas, 80%Ar+20%CO 2 Mixed gas and 100% Ar) were used to weld 309 stainless steel respectively, and the mass percentages of the chemical components of the deposited met...

Embodiment 3

[0071] Embodiment 3: Preparation of flux-cored welding wire

[0072] Flux-cored welding wire used for high-temperature heat treatment of stainless steel welding, which is made by filling flux-core powder in a stainless steel (309 stainless steel) strip with a filling rate of 23% and rolling. The mass percentage of the flux-core powder is as follows: 25.5 parts Metal chromium powder, 19.7 parts of metal nickel powder, 3.1 parts of medium carbon ferromanganese, 3.2 parts of chromium nitride, 23 parts of rutile, 5 parts of silicon calcium barium alloy, 6 parts of sillimanite, 5 parts of fluorite, 3 parts of rare earth fluoride , 4 parts of magnesia, 2.5 parts of aluminum powder.

[0073] After being rolled and drawn by the flux-cored wire production line, the flux-cored wire uses a variety of shielding gases (100% CO 2 Gas, 80%Ar+20%CO 2 Mixed gas and 100% Ar) were used to weld 309 stainless steel respectively, and the mass percentages of the chemical components of the deposite...

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Abstract

The invention relates to a flux-cored wire for welding stainless steel used in a high-temperature environment. The flux-cored wire is composed of flux-cored powder and a stainless steel band wrapping the flux-cored powder, wherein the flux-cored powder accounts for 15-25% of the total weight of the flux-cored wire, for example, 20-25% of the total weight of the flux-cored wire, and the flux-cored powder comprises, by mass, metal chromium powder, metal nickel powder, medium-carbon ferromanganese, chromium nitride, rutile. silicon-calcium-barium alloy, sillimanite, fluorite, rare earth fluoride, magnesia and aluminum powder. The flux-cored wire is prepared according to the following method: rolling the stainless steel band into a U shape, and adding prepared flux-cored powder into a U-shaped groove; after the U-shaped groove is closed, sequentially conducting rolling forming and continuous drawing diameter reducing treatment to obtain a welding wire; and mechanically cleaning the surface of the welding wire to obtain a final product of the flux-cored wire. The invention also provides a method for preparing the flux-cored wire. The flux-cored wire has the excellent technical effects as described in the specification.

Description

technical field [0001] The invention belongs to the field of welding materials, and relates to a flux-cored welding wire for stainless steel welding, in particular to a flux-cored welding wire for welding stainless steel used in high-temperature environments. The flux-cored welding wire of the present invention is mainly used for welding stainless steel used in high-temperature environments or welding stainless steel and other dissimilar steels. Background technique [0002] Judging from the current level of thermal power generation technology in the world, the technologies that are vigorously developed include clean coal power generation technology that improves the efficiency of thermal power units and reduces pollution. The main way to improve the efficiency of thermal power units is to increase the pressure and temperature of steam, and develop supercritical and ultra-supercritical units. With the development of electric power industry and boiler equipment technology, i...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40
Inventor 王立志李伟王磊张杰曲维春李柱
Owner BEIJING JINWEI WELDING MATERIAL
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