Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof

A low-alloy steel, narrow gap technology, used in welding equipment, welding media, metal processing equipment, etc., can solve the problems of poor slag removal, can not meet narrow gap groove welding, etc., to reduce consumption rate, high-quality alloys Transition ability, effect of less melting

Active Publication Date: 2015-06-03
TIANJIN HEAVY EQUIP ENG RES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing low-alloy steel general-purpose fluxes often cannot meet the requirements of narrow-gap groove welding, especially when welding deep and narrow grooves with a wall thickness exceeding 200 mm, the slag removal performance is generally not good

Method used

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  • Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof
  • Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof
  • Submerged-arc welding flux for low-alloy-steel narrow-gap welding and preparation method thereof

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preparation example Construction

[0025] Obtain the preparation method of the flux containing above-mentioned composition and content, comprise the steps:

[0026] (1) Weigh 25-35% magnesia (MgO), 20-25% calcium fluoride (CaF), 10-20% aluminum oxide (Al 2 o 3 ), 10-15% wollastonite (CaO·SiO 2 ), 5-13% marble (CaCO 3 ), 0.5% ferrosilicon (Si-Fe), 0.5-2.0% ferromanganese (Mn-Fe), batching and dry blending;

[0027] (2) The dry-mixed material is sieved, and the mesh number of the sieve is selected as 40 orders. Strictly speaking, the material that should be weighed is all passed through the sieve, so that few inclusions and hardened substances in the material can be removed, and carry out preliminary mixing;

[0028] (3) After reweighing the material under the sieve, add binder, and wet mix the material evenly;

[0029] (4) Transfer the wet-mixed material to the granulation tray for granulation;

[0030] (5) Baking the granulated material and then sintering it at high temperature;

[0031] (6) Sieve the ma...

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Abstract

The invention relates to a submerged-arc welding flux for low-alloy-steel narrow-gap welding and a preparation method thereof. A high-alkalinity MgO-CaO-Al2O3-CaF slag system is adopted, and the submerged-arc welding flux is mainly made from raw materials including calcium fluoride, aluminum oxide, wollastonite, marbles, silicon iron and ferromanganese iron. The preparation method of the submerged-arc welding flux mainly comprises the steps of 1 dry mixing in proportion, 2 impurity removal, 3 bonding agent adding for wet mixing and 4 baking and high-temperature sintering. The alkalinity of the welding flux ranges from 2.0 to 3.0, low-hydrogen and low-oxygen deposited metal containing ultra low P and S impurity contents can be obtained through welding, and accordingly it can be ensured that the deposited metal has excellent comprehensive mechanical property. When the submerged-arc welding flux is matched and welded with a low-purity low-alloy steel welding wire, S and P are not added into the deposited metal by adopting the welding flux. The submerged-arc welding flux has excellent alloy transition capacity.

Description

technical field [0001] The invention belongs to the field of welding materials, and is a general-purpose submerged arc welding flux for welding low-alloy steel and a preparation method thereof. It has good adaptability to large thick-walled deep and narrow grooves, and is mainly suitable for nuclear power reactors, petrochemical vessels, Welding of pressure vessels such as fertilizer synthesis towers. Background technique [0002] With the rapid development of my country's economy, the demand for electricity, oil and natural gas and other resources is continuing to grow rapidly. Pressure vessels such as nuclear reactor pressure vessels and petroleum hydrogenation reactors are not only increasing in number, but individual vessels are also becoming thicker and larger. direction development. Because these pressure vessels have to work under the conditions of high temperature, high pressure, strong radiation, and hydrogen exposure, the requirements for the manufacturing technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362
CPCB23K35/362B23K35/40
Inventor 张秀海高蕊王赞张帆马志宝刘学利
Owner TIANJIN HEAVY EQUIP ENG RES
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