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Welding flux for carbon steel submerged arc strip surfacing and preparation method for welding flux

A strip surfacing and flux technology, which is applied in arc welding equipment, welding equipment, welding equipment, etc., can solve problems such as non-fusion, high requirements for welding equipment, and easy hydrogen stripping, so as to improve fluidity and good detachment. Slag property, arc stability improvement effect

Inactive Publication Date: 2014-04-30
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For strip electroslag surfacing, since the welding process is an electroslag process, the melting of the steel strip is completed by the current through the resistance heat generated by the molten slag in advance. This process requires stable welding parameters and cannot fluctuate too much, so for The requirements for welding equipment are relatively high. At the same time, due to the shallow weld penetration in the electroslag process, defects such as incomplete fusion and slag inclusion are prone to occur. For the surfacing layer, hydrogen stripping is prone to occur during subsequent use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] SiO 2 36kg, MgO 32kg, Al 2 o 3 12kg, CaF 2 28 kg, CaO 3.0 kg, MnO 6.0 kg powders were placed in a mixer, stirred and mixed evenly, then 18 kg of sodium water glass was added to mix and granulate, and then baked at 150°C, sintered at 700°C, and sieved. A flux product is produced.

[0052] The flux is matched with DT4A welding strip (the composition of the welding strip is: C 0.003, Mn 0.14, Si 0.018, S 0.004, P 0.006, Cr 0.023, Ni 0.020, Al 0.41, Cu 0.005, Ti0.001, and the balance is Fe), the submerged arc welding experiment was carried out on the 40mm thick Q345E steel plate. The welding process performance is excellent, the welding process is stable, the fusion between the weld beads is good, the slag is easy to remove, the surface of the weld bead is beautiful, the edge of the weld is neat, and there are no welding defects such as undercut, pores, and cracks. According to the relevant regulations in NB / T 47013-2012: Ultrasonic (100% UT) and surface penetration...

Embodiment 2

[0055] SiO 2 33kg, MgO 30kg, Al 2 o 3 13kg, CaF 2 Put 10 kg, CaO 3.0 kg, MnO 6.0 kg of industrial pure powder in a mixer, stir and mix evenly, add 18 kg of sodium water glass to mix and granulate, then bake at 150 °C, sinter at 700 °C, sieve Points, that is, the flux product is obtained.

[0056] The flux is matched with a special welding strip (the composition of the welding strip is: C 0.033, Mn 0.21, Si 0.01, S 0.006, P 0.009, Cr 0.033, Ni 0.021, Cu 0.02, and the balance is Fe), for a thickness of 40mm Q345E steel plate for submerged arc welding experiment. The welding process performance is excellent, the welding process is stable, the fusion between the weld beads is good, the slag is easy to remove, the surface of the weld bead is beautiful, the edge of the weld is neat, and there are no welding defects such as undercut, pores, and cracks. According to the relevant regulations in NB / T 47013-2012: Ultrasonic (100% UT) and surface penetration (100% PT) are both Cla...

Embodiment 3

[0059] SiO 2 30kg, MgO 27kg, Al 2 o 3 16kg, CaF 2 Put 12 kg, CaO 5.0 kg, MnO 7.0 kg of industrial pure powder in a mixer, stir and mix evenly, add 18 kg of sodium water glass to mix and granulate, then bake at 150°C, sinter at 700°C, and sieve Points, that is, the flux product is obtained.

[0060] The flux is matched with DT4A welding strip (the composition of the welding strip is: C 0.003, Mn 0.14, Si 0.018, S 0.004, P 0.006, Cr 0.023, Ni 0.020, Al 0.41, Cu 0.005, Ti0.001, and the balance is Fe), the submerged arc welding experiment was carried out on the 40mm thick Q345E steel plate. Excellent welding process performance, stable welding process, good fusion between weld beads, easy slag removal, beautiful weld bead surface, neat weld edges, no undercut, pores, cracks and other welding defects according to NB / T 47013- Relevant regulations in 2012: Ultrasonic (100% UT) and surface penetration (100% PT) are both Class I. (Transverse and longitudinal) side bending (D=4...

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Abstract

The invention provides welding flux for carbon steel submerged arc strip surfacing and a preparation method for the welding flux, and belongs to the field of welding materials. The welding flux for carbon steel submerged arc strip surfacing comprises the following components in percentage by weight: 30-45% of SiO2, 25-35% of MgO, 8-20% of Al2O3, 8-20% of CaF2, 2-8% of CaO, 5-12% of MnO, 1-2% of Na2O and 1-2% of K2O. By using the welding flux for the carbon steel submerged arc strip surfacing and the preparation method for the welding flux, surfacing on a transition layer of the surface of carbon steel is performed by the welding flux and a welding strip, a welding process is stable, an effect of fusion between welding ways is high, residues are removed easily, surfaces of the welding ways are formed attractively, edges of welding joints are neat, and requirements of thin-walled pressure vessels such as a boiler and a nuclear power station on surfacing of the transition layer of the carbon steel can be met.

Description

[0001] technical field [0002] The invention belongs to the field of welding materials, and in particular relates to a flux for carbon steel submerged arc strip surfacing welding and a preparation method thereof. Background technique [0003] Hydrogenation reactors, raw flow synthesis towers, coal liquefaction reactors, and thick-walled pressure vessels in nuclear power plants in the petrochemical industry all need to operate in high-temperature and high-pressure environments. Most of them are corroded by the medium, and ordinary materials cannot withstand them. If these containers are made of stainless steel as a whole, the cost will be greatly increased, and since the strength of stainless steel itself is not high, if the wall thickness is increased, the difficulty of processing and manufacturing will be increased. The current common practice is to carry out large-area surfacing welding of high-temperature resistant, oxygen-resistant, hydrogen sulfide-resistant stainless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/40
CPCB23K35/3602B23K9/04B23K9/18B23K35/306B23K35/362B23K2103/04
Inventor 杨飞彭祺珉
Owner ATLANTIC CHINA WELDING CONSUMABLES
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