Welding flux for X70 pipeline steel longitudinal submerged arc welding and preparation method of welding flux

A technology of straight seam submerged arc welding and pipeline steel, applied in arc welding equipment, welding equipment, welding equipment, etc., to achieve the effect of reducing labor intensity, improving one-time pass rate, and good low-temperature impact toughness

Inactive Publication Date: 2018-01-09
巩义市广大焊业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluxes with higher alkalinity generally have fewer impurities in the weld seam and are more beneficial to the alloy, which can meet the requirements of higher mechanical properties, but have strict requirements on the quality of the groove surface, and should use DC power supply, reverse polarity operation

Method used

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  • Welding flux for X70 pipeline steel longitudinal submerged arc welding and preparation method of welding flux
  • Welding flux for X70 pipeline steel longitudinal submerged arc welding and preparation method of welding flux
  • Welding flux for X70 pipeline steel longitudinal submerged arc welding and preparation method of welding flux

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preparation example Construction

[0020] A kind of preparation method of above-mentioned X70 pipeline steel straight seam submerged arc welding flux, described steps are as follows:

[0021] (1) Raw material preparation, MnO, GaF, Al2O3, MgO, SiFe raw materials with good quality and high purity;

[0022] (2) Processing the raw materials in step (1) into 100-mesh fine powder respectively to obtain the raw material fine powder;

[0023] (3) Weigh out the raw material fine powder prepared in step (2) according to the formula and mix evenly to obtain the mixed raw material;

[0024] (4) Adding the mixed raw material prepared in step (3) into sodium silicate and stirring to obtain millet-shaped granules;

[0025] (5) drying the semi-solid raw material prepared in step (4), and controlling the moisture content within 5% after drying;

[0026] (6) Sintering, heat the flux dried in step (5) at a temperature of 790-810 degrees for 90-110 minutes;

[0027] (7) Pass the flux sintered in step (6) through a 10-26 mesh s...

Embodiment 1

[0029] A kind of flux for straight seam submerged arc welding of X70 pipeline steel, the chemical formula of described flux comprises MnO9wt.%, GaF20wt.%, Al 2 0 3 20 wt.%, MgO32 wt.%, siFeO.9 wt.%.

[0030] The above-mentioned flux for linear submerged arc welding of X70 pipeline steel, the basicity of the flux for linear submerged arc welding of X70 pipeline steel is 1.2.

[0031] A preparation method of flux for X70 pipeline steel longitudinal submerged arc welding as described above, the steps are as follows:

[0032] (1) Prepare raw materials, prepare high-quality MnO, GaF, Al203, MgO, SiFe raw materials;

[0033] (2) Processing the raw materials in step (1) into 100-mesh fine powder respectively to obtain the raw material fine powder;

[0034] (3) Weigh out the raw material fine powder prepared in step (2) according to the formula and mix evenly to obtain the mixed raw material;

[0035] (4) Adding the mixed raw material prepared in step (3) into sodium silicate and ...

Embodiment 2

[0040] A kind of flux for straight seam submerged arc welding of X70 pipeline steel, the chemical formula of described flux comprises MnO10wt.%, GaF25wt.%, Al 2 0 3 23wt.%, MgO36 wt.%, siFe1.05 wt.%.

[0041] For the X70 pipeline steel longitudinal submerged arc welding flux described above, the basicity of the X70 pipeline steel longitudinal submerged arc welding flux is 1.4.

[0042] A preparation method of flux for X70 pipeline steel longitudinal submerged arc welding as described above, the steps are as follows:

[0043] (1) Prepare raw materials, prepare high-quality MnO, GaF, Al203, MgO, SiFe raw materials;

[0044] (2) Processing the raw materials in step (1) into 100-mesh fine powder respectively to obtain the raw material fine powder;

[0045] (3) Weigh out the raw material fine powder prepared in step (2) according to the formula and mix evenly to obtain the mixed raw material;

[0046] (4) Adding the mixed raw material prepared in step (3) into sodium silicate a...

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Abstract

The invention relates to welding flux for X70 pipeline steel longitudinal submerged arc welding and a preparation method of the welding flux. The welding flux comprises 9 wt.%-11 wt.% of Mn, 20 wt.%-30 wt.% of GaF, 20 wt.%-26 wt.% of Al2O3, 32 wt.%-40 wt.% of MgO and 0.9 wt.%-1.2 wt.% of siFe. The defects of slag inclusion, air holes and the like prone to being caused in the welding process are reduced, the process performance obtained when a welding seam has good low temperature impact toughness is met, the one-time passing rate of pipe detection is increased, and the labor intensity of workers is reduced.

Description

technical field [0001] The invention relates to the field of flux, in particular to a flux for straight seam submerged arc welding of X70 pipeline steel and a preparation method thereof. Background technique [0002] Medium-thick plates and coils used in the manufacture of oil, natural gas gathering and long-distance pipelines or coal, building material slurry pipelines, etc. are called pipeline steel (steel for pipeline). Generally, medium and thick plates are used to make thick-walled straight seam welded pipes, while coils are used to produce straight seam resistance welded pipes or submerged arc spiral welded pipes. The country has a production capacity of 700,000 t / a of spiral welded pipes with diameters within 1800mm, and has established a production line for straight seam thick-walled pipes with diameters within 1600mm. It is only over 10 years since China has been able to produce pipeline steel that meets API5L standard pipeline engineering design requirements. Most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/40B23K9/18
Inventor 郑学敏马长权
Owner 巩义市广大焊业有限责任公司
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