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High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof

A sintered flux, high toughness technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of high content of diffusible hydrogen in the deposited metal, easy cracks in the weld metal, and good flux performance, to reduce diffusible hydrogen. content, the effect of solving weld cracking and reducing the tendency of weld cracking

Active Publication Date: 2012-07-25
BAOJI YUSHENG WELDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-alkalinity, high-toughness, low-hydrogen type sintered flux, which is especially suitable for multi-wire submerged arc welding of marine oil and gas transmission thick plate pipeline steel, and solves the problem of poor toughness of the existing flux weld metal. The weld metal is prone to cracks due to high hydrogen content in the deposited metal, and the flux performance is good

Method used

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  • High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof
  • High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof
  • High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the mass percentage, weigh 18% MgO and 33% CaF respectively 2 , 15% Al 2 o 3 , 17% SiO 2 , 4% CaO, 5% MnO, 5% BaCO 3 , 3% FeO, mixed and dry-stirred each of the raw materials weighed, and mixed powder was obtained after stirring evenly, then added water glass binder accounting for 20% of the weight of the mixed powder, then fully wet stirred until uniform, and then mixed Wet and evenly mixed materials are sent to the granulator for granulation. The granular flux produced is dried by hot air and then enters the drying furnace. It is dried at a temperature of 180 ° C. After being released from the furnace, it is screened and then enters the sintering furnace. After sintering in a sintering furnace for 1 hour at a temperature of ℃, it is released from the furnace, then passed through a sieve, and cooled to obtain the product.

[0032] After testing:

[0033] Solder alkalinity (B IIW ): 2.42.

[0034] At atmospheric pressure of 102.6kPa, 26°C, 69% humidi...

Embodiment 2

[0038] According to the mass percentage, weigh 21.5% of MgO and 35% of CaF respectively 2 , 15% Al 2 o 3 , 21% SiO 2 , 3.5% CaO, 1% MnO, 2% BaCO 3 , 1% FeO, mixed and dry-stirred each raw material weighed, and obtained mixed powder after stirring evenly, then added water glass binder accounting for 20% of mixed powder weight, then fully wet stirred until uniform, and then mixed Wet and evenly mixed materials are sent to the granulator for granulation. The granular flux produced is dried by hot air and then enters the drying furnace. It is dried at a temperature of 230 ° C. After being released from the furnace, it is screened and then enters the sintering furnace. After sintering in a sintering furnace for 2 hours at a temperature of ℃, it is released from the furnace, then passed through a sieve, and cooled to obtain the product.

[0039] After testing:

[0040] Solder alkalinity (B IIW ): 2.39.

[0041] At atmospheric pressure 101.8kPa, 24°C, 56% humidity, after 72 ho...

Embodiment 3

[0045] According to the mass percentage, weigh 18% MgO and 33% CaF respectively 2 , 20% Al 2 o 3 , 17% SiO 2 , 8% CaO, 1% MnO, 2% BaCO 3 , 1% FeO, mixed and dry-stirred each raw material weighed, and obtained mixed powder after stirring evenly, then added water glass binder accounting for 20% of mixed powder weight, then fully wet stirred until uniform, and then mixed Wet and evenly mixed materials are sent to the granulator for granulation. The granular flux produced is dried by hot air and then enters the drying furnace. It is dried at a temperature of 200 ° C. After being released from the furnace, it is screened and then enters the sintering furnace. After sintering in a sintering furnace for 1.5 hours at a temperature of ℃, it is released from the furnace, then passed through a sieve, and cooled to obtain the product.

[0046] After testing:

[0047] Solder alkalinity (B IIW ): 2.35.

[0048] At atmospheric pressure 101.6kPa, 25°C, 53% humidity, after 72 hours, the...

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Abstract

The invention discloses a high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the following components by weight: 18-21.5% of MgO, 33-35% of CaF2, 15-20% of Al2O3, 17-21% of SiO2, 3.5-8% of CaO, 1-5% of MnO, 2-5% of BaCO3, and less than or equal to 3% of FeO, wherein the total weight of the components is 100%. The invention further discloses a preparation method of the high-alkalinity high-tenacity low-hydrogen agglomerated flux, which comprises the steps of: mixing the raw materials and performing dry agitation, adding sodium silicate that accounts for 20wt% of the mixed powder, performing wet agitation, sending the materials to a pelletizer to pelletize, entering into a drying furnace after being dried by hot wind, drying at 180-230 DEG C, screening after discharge and then entering into a sintering furnace, sintering in the sintering furnace at 830-860 DEG C and discharging, and finally, screening and cooling to obtain the high-alkalinity high-tenacity low-hydrogen agglomerated flux. The flux provided by the invention solves the problems that a current flux is poor in toughness of weld metal and high in diffusible hydrogen content in deposited metal.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to a high-alkalinity, high-toughness, low-hydrogen type sintered flux mainly used for multi-wire submerged arc welding of thick-plate pipeline steel for marine oil and gas transmission. The invention also relates to a preparation method of the flux . Background technique [0002] Flux is a material for submerged arc automatic welding, which is divided into two categories: melting flux and sintering flux. Sintered flux has the advantages of continuous production, no pollution, high alkalinity, suitable for welding of higher strength steel, and can obtain higher plasticity and toughness. It is widely used in bridges, pressure vessels, metal structures, shipbuilding, vehicles and Welding and manufacturing of oil and gas transmission pipelines, etc. The sintered flux with low alkalinity, high silicon and high manganese slag can easily obtain good process performance, but the i...

Claims

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Application Information

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IPC IPC(8): B23K35/362
Inventor 孟钰竣何少卿
Owner BAOJI YUSHENG WELDING MATERIAL
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