High-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel and preparation method thereof

A technology of sintering flux and submerged arc welding, which is applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problem of no flux materials for submerged arc welding, and achieve the effect of improving low temperature impact toughness and welding speed

Inactive Publication Date: 2013-02-06
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the welding wire for submerged arc welding of X100 pipeline steel has also entered the experimental stage, and has achieved preliminary results, but there is no matching flux material for submerged arc welding to ensure that the weld has high strength, high toughness and welding. Required processability, especially low temperature impact toughness

Method used

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  • High-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel and preparation method thereof
  • High-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel and preparation method thereof
  • High-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel and preparation method thereof

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Experimental program
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preparation example Construction

[0017] The present invention also provides the preparation method of above-mentioned flux, implement according to the following steps:

[0018] 1) Weigh the following mineral powders: fluorite, fused magnesia, wollastonite, bauxite, manganese ore, SiFe and light rare earth oxides;

[0019] 2) Put the weighed substances in the same container and mix them so that the content of each substance according to the mass percentage is: 19%~25% CaF 2 , 25%~29% MgO, 5%~8% CaO, 21%~25% Al 2 o 3 , 4%~8% MnO, 1%~2.5%, 0.8%~1.2% Re, the balance is SiO 2 , the sum of the mass percentages of the above components is 100%;

[0020] Of which SiO 2 It is added through mineral powder, and SiO in the finished flux 2 The content should not exceed 20%.

[0021] 3) After mixing evenly, add binder according to 22%~25% of the mass of all components, carry out wet mixing evenly to make it semi-solid, then rub back and forth in the container basin to form granules, and pass through an 8-mesh sieve, ...

Embodiment 1

[0039] Weigh 25% CaF with a balance according to the mass percentage 2 , 29% MgO, 5% CaO, 25% Al 2 o 3 , 8% MnO, 2.5% SiFe, 0.8% Re, and the balance is SiO 2 , the sum of the mass percentages of the above components is 100%.

[0040] According to the formula, use a balance to weigh the required raw materials and place them in the same container. After mixing the powders evenly, add 25% of the binder (K-Na mixed water glass), carry out wet stirring to become semi-solid, and stir evenly. The wet material was rubbed back and forth in the container basin to form granules, and passed through an 8-mesh sieve, and the granulated flux was placed at room temperature and ventilated for 5 hours to dry. Then put it into a drying furnace for drying, the temperature is controlled at 250°C, after drying, put the flux into the sintering furnace and heat it to 900°C, the sintering time is not less than 2 hours, and the sintered flux is sieved through a 30-mesh sieve The finished flux is ob...

Embodiment 2

[0049] Weigh 23% CaF with a balance according to the mass percentage 2 , 26% MgO, 6% CaO, 23% Al 2 o 3 , 6% MnO, 2% SiFe, 1% Re, and the balance is SiO 2 , the sum of the mass percentages of the above components is 100%.

[0050] According to the formula, use a balance to weigh the required raw materials and put them in the same container. After mixing the powders evenly, add 23% binder (K-Na mixed water glass), carry out wet stirring to become semi-solid, and stir evenly The wet material was rubbed back and forth in the container basin to form granules, and passed through an 8-mesh sieve, and the granulated flux was placed at room temperature and ventilated for 4 hours to dry. Then put it into a drying furnace for drying, the temperature is controlled at about 250°C, after drying, put the flux into the sintering furnace and heat it to 750°C, the sintering time is not less than 2 hours, and the sintered flux is passed through a 40-mesh sieve Sieve to get the finished flux....

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Abstract

The invention discloses a high-welding-speed sintered flux for submerged-arc welding of X100 pipeline steel. The high-welding-speed sintered flux comprises the following components in percent by mass: 19 to 25 percent of CaF2, 25 to 29 percent of MgO, 5 to 8 percent of CaO, 21 to 25 percent of Al2O3, 4 to 8 percent of MnO, 1 to 2.5 percent of SiFe, 1.5 to 3 percent of ZrO2, and the balance of SiO2, wherein the sum of the mass percents of the components is 100 percent. When the SiO2 which is carried by mineral powder, a flux material prepared by adoption of a sintering method and a matched soldering wire are used under high input energy at a high welding speed (1.8m/min), the welding manufacturability is excellent, a soldered joint has the properties of high low-temperature impact ductility, high welding seam strength, better capacity of removing S and P, a function of transiting alloys and the like, and the welding seam strength and the tenacity can be completely matched with a base material of high-grade pipeline steel, so that the high-welding-speed sintered flux is suitable for welding pipeline steel of which the ReL is more than or equal to 610MPa.

Description

technical field [0001] The invention belongs to the technical field of material processing. The invention relates to a flux material, in particular to a high-speed submerged arc welding flux for X100 pipeline steel. The invention also relates to a preparation method of the flux. Background technique [0002] The development trend of pipeline construction is to develop towards long distance, high pressure, and large caliber, so that its strength requirements are getting higher and higher; in addition, since the oil and gas production area to the consumption area is often thousands of kilometers long, the geological conditions along the way are complex and the climate is changeable. , the toughness of pipeline steel is also put forward higher and higher requirements. At present, X80 grade steel plate and supporting welding wire have been used in the second line project of "West-to-East Gas Pipeline" and achieved good results. The higher-strength pipeline steel X100 has also a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362
Inventor 张敏陈飞绸李继红
Owner XIAN UNIV OF TECH
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