Smelting flux for submerged-arc welding and preparation method and application of smelting flux

A smelting and submerged arc welding technology, which is applied in the direction of arc welding equipment, welding equipment, welding equipment, etc., can solve the problems of poor welding process performance, surface shape and slag removal performance, difficult process performance and low temperature toughness, and weld metal impact toughness Poor and other problems, to meet the requirements of the welding process, excellent fit, the effect of smooth weld bead surface

Active Publication Date: 2016-10-26
CHANGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, when the basicity of the melting flux is low, it is easier to obtain good process performance, but the impact toughness of the weld metal is poor; when the basicity of the melting flux is higher, it is easier to obtain High toughness welds are obtained, but the welding process properties such as the surface shape of the weld bead and slag release are poor
Aiming at the difficulty of excellent and suitable combination of process performance and low-temperature toughness faced by smelting flux in industrial production, it is necessary to prepare a flux with excellent performance, which can not only realize the excellent combination of weld metal strength and low-temperature toughness, but also have smooth Excellent weld bead surface shape, good slag removal performance and no defects in radiographic inspection to meet the urgent needs of current industrial production

Method used

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  • Smelting flux for submerged-arc welding and preparation method and application of smelting flux

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the mass percentage, weigh 24% CaF 2 , 8% CaO, 17% MgO, 20% SiO 2 , 15% Al 2 o 3 , 6% MnO 2 , 2% TiO 2 , 1% K 2 CO 3 , 1% Li 2 O, 5% BaCO 3 , 1% FeO. Mix and stir the above-mentioned weighed raw materials, and get a uniform mixed powder after stirring evenly. Put the uniform mixed powder into a graphite crucible and put it in a melting furnace for melting. State semi-finished products. The obtained glass semi-finished product was placed in a drying oven for drying at a drying temperature of 120° C. and kept for 48 hours. Crushing the dried glassy semi-finished product to a particle size within the range of 250-350 μm to obtain the finished smelted flux. Welded the 12MnNiVR structural steel with the obtained smelted flux and US-49 welding wire. The obtained performance indicators are as follows: the tensile strength is 675MPa, the bending test (side bending 180°) is qualified, the impact absorption energy (weld area) is 129.6J, and the slag remova...

Embodiment 2

[0018] According to the mass percentage, respectively weigh 39% of CaF 2 , 13% CaO, 10% MgO, 14% SiO 2 , 9% Al 2 o 3 , 5% MnO 2 , 1% TiO 2 , 1% K 2 CO 3 , 1% Li 2 O, 6% BaCO 3 , 1% FeO. Mix and stir the above-mentioned weighed raw materials, and get a uniform mixed powder after stirring evenly. Put the uniform mixed powder into a graphite crucible and put it in a melting furnace for melting. State semi-finished products. The obtained glass semi-finished product was placed in a drying oven for drying at a drying temperature of 120° C. and kept for 48 hours. Crushing the dried glassy semi-finished product to a particle size within the range of 250-350 μm to obtain the finished smelted flux. Welded the 12MnNiVR structural steel with the obtained smelted flux and US-49 welding wire. The obtained performance indicators are as follows: the tensile strength is 710MPa, the bending test (side bending 180°) is qualified, the impact absorption energy (weld area) is 136.4J, and...

Embodiment 3

[0020] According to the mass percentage, respectively weigh 48% of CaF 2 , 16% CaO, 5% MgO, 11% SiO 2 , 7% Al 2 o 3 , 4% MnO 2 , 1% TiO 2 , 1% K 2 CO 3 , 1% Li 2 O, 5% BaCO 3 , 1% FeO. Mix and stir the above-mentioned weighed raw materials, and get a uniform mixed powder after stirring evenly. Put the uniform mixed powder into a graphite crucible and put it in a melting furnace for melting. State semi-finished products. The obtained glass semi-finished product was placed in a drying oven for drying at a drying temperature of 120° C. and kept for 48 hours. Crushing the dried glassy semi-finished product to a particle size within the range of 250-350 μm to obtain the finished smelted flux. Welded the 12MnNiVR structural steel with the obtained smelted flux and US-49 welding wire. The obtained performance indicators are as follows: the tensile strength is 653MPa, the bending test (side bending 180°) is qualified, the impact absorption energy (weld area) is 148.7J, and ...

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Abstract

The invention discloses a smelting flux for submerged-arc welding and a preparation method of the smelting flux. The smelting flux comprises the following components in percent by mass: 24-48 percent of CaF2, 8-16 percent of CaO, 5-27 percent of MgO, 10-30 percent of SiO2, 7-20 percent of Al2O3, 4-10 percent of MnO2, 0.5-2 percent of TiO2, 0.5-2 percent of K2CO3, 0.5-2 percent of Li2O, 5-10 percent of BaCO3, and 0.2-3 percent of FeO. The ratio of CaF2 to CaO is strictly controlled to be within the range of (3:1). The total mass percent of the components is 100%. The novel smelting flux prepared according to the preparation method is simple in preparation method, and a high-quality flux material is provided for welding low-alloy high-strength steel after an appropriate amount of welding wires are added.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a CaO-MgO-Al for submerged arc welding 2 o 3 ~CaF 2 ~SiO2 2 The preparation method of the slag-based smelting flux is mainly used in the welding of low-alloy high-strength structural steel for large oil and gas storage and transportation containers. Background technique [0002] Flux is a filler for submerged arc automatic welding, which is mainly divided into two categories: melting flux and sintering flux. The smelting flux is made of various ores smelted in an electric arc furnace and crushed. It has the characteristics of continuous production, no pollution, and adjustable alkalinity. Among them, acid smelting flux is the most widely used, and it is widely used in the welding of carbon steel and low alloy structural steel after it is matched with appropriate welding wire. When welding high-strength steel with high strength, neutral or alkaline melting flux must be selec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40B23K35/362B23K9/18
CPCB23K9/18B23K35/362B23K35/40
Inventor 付猛刘鹏王世颖李海陈智栋葛乐通
Owner CHANGZHOU UNIV
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