Low-hydrogen high-tenacity self-protection flux-cored wire and preparation method thereof

A flux-cored wire, high toughness technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of low impact value, large dispersion of low-temperature impact toughness, etc., to avoid rust, good welding process performance, good The effect of all-position welding adaptation

Inactive Publication Date: 2018-09-18
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, high-grade pipeline steel puts forward higher requirements on the quality of the weld metal, especially the low-temperature toughness. The current self-shielding flux-cored wire semi-automatic welding weld metal has a lar

Method used

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  • Low-hydrogen high-tenacity self-protection flux-cored wire and preparation method thereof
  • Low-hydrogen high-tenacity self-protection flux-cored wire and preparation method thereof
  • Low-hydrogen high-tenacity self-protection flux-cored wire and preparation method thereof

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Embodiment

[0058] A method for preparing a low-hydrogen high-toughness self-shielding flux-cored welding wire, mainly comprising the following steps:

[0059] Step 1, material preparation:

[0060] As shown in Table 1, according to the core ratio of low-hydrogen high-toughness self-shielding flux-cored welding wire, weigh fluoride, oxide, carbonate and sodium borate, and mix the fluoride, oxide and carbonate in the mixer Dry mix evenly to obtain mixed dry powder, dissolve sodium borate in distilled water to make a sodium borate aqueous solution with a concentration of 0.4-2.0 mg / ml;

[0061] Step 2, preprocessing:

[0062] Add sodium borate aqueous solution to the mixed dry powder for wet mixing, and granulate through a granulator to obtain spherical or ellipsoidal particle powder with a particle size of 2-10mm. Sinter the above-mentioned particle powder in a resistance furnace, sintering temperature, heat preservation The time is shown in Table 2. After air-cooling to room temperature...

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Abstract

The invention discloses a low-hydrogen high-tenacity self-protection flux-cored wire and a preparation method thereof and belongs to the field of metal welding materials. The low-hydrogen high-tenacity self-protection flux-cored wire is composed of low-carbon steel steel strip and a flux core, wherein the flux core is composed of the following components in percentage by mass: 45-55% of fluoride,10-20% of oxide, 2-8% of carbonate, 0.2-1.0% of sodium borate, 2-6% of metallic aluminium, 10-16% of aluminium magnesium alloy, 3-7% of metallic manganese, 5-13% of metallic nickel, 0-5% of metallic cobalt and 0.1-0.4% of metallic zirconium, and the sum of the mass percent of the components is 100%. The preparation method comprises the following steps: mixing fluoride, oxide, carbonate and sodiumborate to obtain a mixture, carrying out sintering pretreatment on the mixture, then, adding other raw materials, uniformly mixing to obtain flux core powder, adding the flux core powder in the steelstrip, and carrying out reducing, straightening, disc winding and packaging to obtain the finished product of the welding wire.

Description

technical field [0001] The invention belongs to the field of metal welding materials, and particularly relates to a low-hydrogen high-toughness self-shielded flux-cored welding wire and a preparation method thereof. Background technique [0002] Self-shielded flux-cored wire is a new type of welding material that does not require additional protection measures during welding, and only relies on flux-cored components to protect the welding process. It is especially suitable for field operations and occasions where the air source is not easy to reach. It is one of the main welding materials for field construction such as oil and gas pipelines, offshore platforms, and high-rise buildings. In recent years, oil and gas pipelines, especially natural gas pipelines, have developed rapidly. An important feature is long distance, large diameter, high pressure, and the selection of higher-grade steel pipes. The same gas transmission volume can be reduced when high-pressure transportati...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/40B23K35/02
CPCB23K35/0266B23K35/3605B23K35/406
Inventor 张占伟国旭明莫春立马琳徐荣正田状
Owner SHENYANG AEROSPACE UNIVERSITY
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