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Ultralow-hydrogen type high-alkalinity high-toughness sintered flux

A sintered flux, high basicity technology, used in ultra-low hydrogen type high basicity and high toughness sintered flux, welding of thick-walled pressure vessels, automatic submerged arc welding of low-alloy steel, can solve serious silicon infiltration, low temperature impact The problems of poor toughness and high content of impurity elements can achieve the effect of excellent technical effect

Pending Publication Date: 2020-12-11
BEIJING JINWEI WELDING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previous studies have shown that low-alkalinity slag-based sintered flux is easy to obtain good process performance, but the flux contains a large amount of acidic oxides such as SiO2 or TiO2, the weld has high oxygen content, serious silicon infiltration, high content of impurity elements, low temperature The impact toughness is poor; and the high alkalinity slag is due to the addition of more basic oxides such as CaO and MgO, which increases the alkalinity of the flux, reduces the oxygen content of the weld, and improves the low temperature toughness of the weld, but the welding process poor performance

Method used

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  • Ultralow-hydrogen type high-alkalinity high-toughness sintered flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] a, flux component (dry powder material): the MgO of 18 weight parts, the CaF of 21 weight parts2, the Al2O3 of 25 weight parts, the CaCO3 of 18 weight parts, the SiO2 of 5 weight parts, the BaCO of 4 weight parts3, the BaCO of 2 weight parts Li2CO3, 3 parts by weight of K2O+Na2O (1:1), 3 parts by weight of ferrosilicon manganese alloy.

[0054] b. Flux alkalinity: 2.44.

[0055] c. Preparation method: sieve the raw materials, weigh according to the formula, put each dry powder material into a dry mixer for dry mixing, put it into a wet mixer after dry mixing evenly, add water glass (binder water The weight ratio of glass to dry powder is 20:100) for wet mixing. After the wet mixing is even, put the wet powder on the granulation tray for granulation. After the granulation is completed, send it to the drying furnace and dry it at 280°C to 380°C. to remove moisture, and then sieve the flux, and send the sieved flux within the standard particle size range (16-80 mesh) into...

Embodiment 2

[0061] a, flux component (dry powder material): the MgO of 20 parts by weight, the CaF of 18 parts by weight2, the Al2O3 of 23 parts by weight, the CaCO3 of 20 parts by weight, the SiO2 of 4 parts by weight, the BaCO3 of 5 parts by weight3, the BaCO3 of 3 parts by weight Li2CO3, 4 parts by weight of K2O+Na2O (1:1), 2 parts by weight of ferrosilicon manganese alloy.

[0062] b. Flux alkalinity: 2.61.

[0063] c. Preparation method: sieve the raw materials, weigh according to the formula, put each dry powder material into a dry mixer for dry mixing, put it into a wet mixer after dry mixing evenly, add water glass (binder water The weight ratio of glass to dry powder is 20:100) for wet mixing. After the wet mixing is even, put the wet powder on the granulation tray for granulation. After the granulation is completed, send it to the drying furnace and dry it at 280°C to 380°C. to remove moisture, and then sieve the flux, and send the sieved flux within the standard particle size ...

Embodiment 3

[0069] a, flux component (dry powder material): the MgO of 23 parts by weight, the CaF of 15 parts by weight2, the Al2O3 of 20 parts by weight, the CaCO3 of 17 parts by weight, the SiO2 of 7 parts by weight, the BaCO3 of 3 parts by weight3, the BaCO of 2 parts by weight Li2CO3, 3 parts by weight of K2O+Na2O (1:1), 4 parts by weight of ferrosilicon manganese alloy.

[0070] b. Flux alkalinity: 2.36.

[0071] c. Preparation method: sieve the raw materials, weigh according to the formula, put each dry powder material into a dry mixer for dry mixing, put it into a wet mixer after dry mixing evenly, add water glass (binder water The weight ratio of glass to dry powder is 20:100) for wet mixing. After the wet mixing is even, put the wet powder on the granulation tray for granulation. After the granulation is completed, send it to the drying furnace and dry it at 280°C to 380°C. to remove moisture, and then sieve the flux, and send the sieved flux within the standard particle size r...

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Abstract

The invention relates to an ultralow-hydrogen high-alkalinity high-toughness sintered flux. The sintered flux is specifically prepared from dry powder of multiple components and binder water glass, and the dry powder comprises the following components in parts by weight: 12-23 parts of MgO, 15-25 parts of CaF2, 16-26 parts of Al2O3, 10-20 parts of CaCO3, 1-8 parts of SiO2, 1-5 parts of BaCO3, 1-5parts of Li2CO3, 2-5 parts of K2O+Na2O, and 1-5 parts of silicon-manganese-iron alloy. The ultralow-hydrogen type high-alkalinity high-toughness sintered flux is prepared through the method includingthe following steps that the dry powder materials are evenly mixed according to the proportions, the water glass is added, wet mixing is conducted, then granulation is conducted, drying is conducted at the temperature of 280-380 DEG C to remove the moisture, screening is conducted, high-temperature sintering is conducted at the temperature of 750-850 DEG C, cooling and screening are conducted, andthe ultralow-hydrogen type high-alkalinity high-toughness sintered flux is obtained. The ultralow-hydrogen type high-alkalinity high-toughness sintered flux has the excellent technical effects as shown in the specification.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an ultra-low hydrogen type high-alkalinity and high-toughness sintered flux, which is mainly suitable for submerged arc automatic welding of low alloy steel, and is especially suitable for welding of thick-walled pressure vessels. Background technique [0002] With the development of modern industry and the improvement of automation level, submerged arc automatic welding is widely used in the production of large-scale welding structures such as pipelines, ships, boilers, and thick-walled pressure vessels due to its high degree of automation, fast welding speed, and stable weld performance. be widely used. For example, thick-walled pressure vessels such as hydrogenation reactors in the petroleum refining and chemical industry work under high temperature, high pressure, and hydrogen exposure for a long time. Therefore, in addition to high strength and high tou...

Claims

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Application Information

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IPC IPC(8): B23K35/362
CPCB23K35/362
Inventor 边境王学东李伟王士山王立志李柱白建斌曲维春
Owner BEIJING JINWEI WELDING MATERIAL
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