Large heat input electro-gas welding flux-cored wire and preparation method thereof

A technology of flux-cored welding wire and gas-electric vertical welding, which is applied to welding equipment, welding media, manufacturing tools, etc., and can solve problems such as coarse microstructure of weld metal, poor mechanical properties, and inability to realize high-efficiency welding of medium and thick plates. , to achieve the effect of ensuring mechanical properties and improving welding manufacturing efficiency

Active Publication Date: 2019-09-10
LONGYAN UNIV
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  • Claims
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Problems solved by technology

However, under the condition of high heat input welding, the traditional welding materials in our country will form a coarse microstructure of the weld metal and seriously deteriorate the mechanical properties, which are far from meeting the requirements of construction progress and mechanical properties, and cannot realize high-efficiency welding of medium and thick plates. Effect

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  • Large heat input electro-gas welding flux-cored wire and preparation method thereof

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preparation example Construction

[0044] A method for preparing a large heat input gas-electric vertical welding flux-cored wire, comprising the following steps:

[0045] (1) Weigh each raw material component according to the stoichiometric ratio, and then fully stir, mix and dry in order to prepare the flux-cored wire formula powder;

[0046] (2) Cut the steel strip with preset specifications, and then perform ultrasonic cleaning, degreasing, rust removal, drying and rolling into a U-shaped groove in sequence, and then pour the flux cored wire formula powder into the U-shaped groove of the steel strip After closing, reducing diameter, drawing, and winding up, the high heat input gas-electric vertical welding flux-cored wire is produced.

[0047] Further, the steel strip in step (2) has a thickness of 0.8 mm and a width of 12 mm.

[0048] Further, the powder filling rate of the high heat input gas-electric vertical welding flux-cored wire prepared in step (2) is 18%±5%.

[0049] Further, the diameter of the ...

Embodiment 1

[0052] A method for preparing a large heat input gas-electric vertical welding flux-cored wire, comprising the following steps:

[0053] (1) According to reduced iron powder 53.5%, low carbon ferromanganese powder 19%, nickel powder 8%, magnesium powder 1.2%, fluoride 2.3%, quartz 3.3%, rutile 3.5%, molybdenum iron 1%, boron iron 0.5% %, ferro-titanium 5.5%, aluminum powder 2.2% stoichiometrically weigh various powder raw materials, fully stir, mix evenly, and dry to obtain flux-cored wire formula powder;

[0054] (2) Cut the steel strip with a thickness of 0.8mm, use ultrasonic cleaning, degrease, derust, dry, and roll into a U-shaped groove, pour the metal mixed powder described in step (1) into the U-shaped groove, and pass Closing, diameter reduction, drawing, wire take-up, and finally forming a flux-cored wire with a diameter of 1.6mm.

[0055] The prepared large heat input flux-cored wire was welded under the welding condition of 276 kJ / cm gas-electric vertical welding....

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Abstract

The invention discloses a large heat input electro-gas welding flux-cored wire and a preparation method thereof. Flux core powder of the wire is formed by mixing rutile, quartz, low-carbon ferromanganese powder, nickel powder, magnesium powder, ferroboron, calcium fluoride and iron powder, and drawing a mixture through a low-carbon steel band until the mixture becomes the flux-cored wire with thediameter being 1.6 mm. According to the wire provided by the invention, under large heat input welding conditions, a large quantity of tiny dispersed non-metal inclusions are formed in weld metal; part of the inclusions are distributed on austenite grain boundaries and can be pinned to the austenite grain boundaries in the heating process, and austenite grains are stopped from growing up; and theother part of the inclusions are distributed in the austenite grains, in the weld metal cooling and phase changing process, the inclusions serve as the core, a large quantity of lathy needlelike ferritic (AF) structures are generated in an inducive mode, structures in the austenite grains are refined, in addition, AF grains are interlaced with one another, crack propagation is effectively hindered, and the flux-cored wire can be used for welding of ship plate steel, constructional steel and equal-thickness plates.

Description

technical field [0001] The invention relates to the technical field of welding wire materials and preparation, in particular to a large heat input gas-electric vertical welding flux-cored welding wire and a preparation method thereof. Background technique [0002] In the field of large-scale equipment manufacturing such as shipbuilding, containers, offshore platforms, buildings, and bridges, medium and thick plates are generally used as welding base materials, which prolongs the welding operation time and greatly increases time and labor costs. In this context, large heat input Welding technology has been widely used. Usually, the welding method with welding heat input ≥ 50kJ / cm is called high heat input welding. At present, large heat input welding methods such as automatic gas-electric vertical welding, electroslag welding, and submerged arc welding have been obtained in the related manufacturing fields of medium and heavy plates. It is widely used and greatly reduces the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 宋峰雨
Owner LONGYAN UNIV
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