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Alkaline smelting flux used for submerged arc welding and application

A technology of smelting flux and submerged arc welding, which is applied in arc welding equipment, welding medium, welding equipment, etc., can solve the problem of poor welding process performance, poor surface shape and slag removal performance, difficult process performance and low temperature toughness, and weld metal impact toughness Poor problems, good slag removal performance, good slag removal performance, and smooth weld bead surface

Active Publication Date: 2016-11-09
NANJING CHEM CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that 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, but welding Process performance such as poor surface shape and slag release of the weld bead
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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  • Alkaline smelting flux used for submerged arc welding and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the mass percentage, weigh 14% CaF respectively 2 , 7% CaO, 11.2% MgO, 28% SiO 2 , 22% Al 2 o 3 , 10% MnO 2 , 1.5% TiO 2 , 1.5% K 2 CO 3 , 3% B 2 o 3 , 1.8% 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. Weld the 12MnNiVR structural steel with the obtained smelted flux and US-49 welding wire, and 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 112.9J, and t...

Embodiment 2

[0018] According to the mass percentage, weigh 10% CaF respectively 2 , 13% CaO, 20.8% MgO, 19% SiO 2 , 19% Al 2 o 3 , 8% MnO 2 , 2% TiO 2 , 2% K 2 CO 3 , 3.5% B 2 o 3 , 2.7% 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 696MPa, the bending test (side bending 180°) is qualified, the impact absorption energy (weld area) is 129.1J, and the s...

Embodiment 3

[0020] According to the mass percentage, weigh 10% CaF respectively 2 , 20% CaO, 32% MgO, 15% SiO 2 , 10% Al 2 o 3 , 8% MnO 2 , 1% TiO 2 , 1% K 2 CO 3 , 2.5% B 2 o 3 , 0.5% 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 682MPa, the bending test (side bending 180°) is qualified, the impact absorption energy (weld area) is 153.4J, and the sla...

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Abstract

The invention discloses an alkaline smelting flux used for submerged arc welding. The alkaline smelting flux used for submerged arc welding is characterized by comprising, by mass percentage, 5%-15% of CaF2, 7%-20% of CaO, 11.2%-32% of MgO, 8%-30% of SiO2, 7%-23% of Al2O3, 5%-10% of MnO2, 0.5%-2% of TiO2, 0.5%-2% of K2CO3, 2%-4% of B2O3 and 0.2%-3% of FeO, the proportion of the above CaO and the above MgO is strictly controlled at 1: 1.6, and the total sum of the mass percentage of the above components is 100%. The novel smelting flux is obtained through preparation, the method is simple, and a high-quality smelting flux material is provided for connection of 12MnNiVR low-alloy high-strength steel after US-49 welding wires are used for cooperation.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a smelting flux for submerged arc welding that can be used for low-alloy high-strength structural steel used in large-scale oil and gas storage and transportation containers. Background technique [0002] Submerged arc automatic welding has the characteristics of high degree of automation, fast welding speed and stable weld performance, and is widely used in the production of large-scale welded structures such as boilers and pressure vessels. Welding not only requires the weld metal to have high strength and high toughness (especially low temperature toughness), but also to maintain good process performance during welding (such as good slag removal performance, excellent crack resistance, Smooth weld bead surface shape and no defects in radiographic inspection, etc.). For submerged arc automatic welding, in addition to the welding wire, the quality of the m...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/40B23K9/18
CPCB23K9/182B23K35/3602B23K35/361B23K35/40
Inventor 黄可中付猛孔祥艺李海陈智栋葛乐通
Owner NANJING CHEM CONSTR
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