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

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...

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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 large dispersion of low-temperature impact toughness, and even some individual impact values ​​are low. Therefore, it is necessary to innovate and improve the formula design and preparation process of self-shielding flux cored welding wire

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