RU2056250C1 - Electrode coating composition - Google Patents

Abstract

FIELD: welding. SUBSTANCE: electrode coating contains complex ferroalloy used as reducer and obtained from manganese ore. Electrode coating further contains, % by weight: titanium oxide bearing component 30-55; metal carbonate 5-20; ferroalloy 10-15; cellulose 1-3; phlogopite concentrate 8-35; sodium alumosilicate 2-10. Powdered iron may be introduced into electrode coating in an amount of 8-10% by weight to increase surfacing coefficient and improve welding characteristics (component grinding, molding, spraying coefficient, easy arc excitation, coating depth etc.). Ferroalloy contains, % by weight: manganese 26-32; aluminum 4-5.5; silicon 4-8; titanium 13-22. EFFECT: increased welding and technological characteristics and improved quality of electrode. 2 cl

Description

 The invention relates to welding, in particular to compositions of electrode coatings, and can be used in the manufacture of electrodes for manual arc welding of low carbon and low alloy steels in all spatial positions using a DC and AC power source.

 It is known to use low and medium carbon brands FMN-1 and FMN-1,5 in amounts not exceeding 14 parts by weight in electrode coating compositions as a deoxidant of ferromanganese.

 However, ferromanganese is a scarce and expensive material, it is obtained by multi-stage smelting from natural manganese ores. The ferromanganese used has several disadvantages that affect the technological properties of the coating and the welding and technological properties of the electrodes.

 When grinding the components, a weakly controlled process of regrinding of ferromanganese is observed. When the over-crushed ferromanganese fraction enters the coating, the activity of the latter increases, which reduces the plastic properties of the coating and the quality of crimping the electrodes. The classification of ferromanganese entails additional costs. In addition to this drawback, the fraction of ferromanganese less than 0.05 mm reduces the conversion coefficient of manganese in the weld metal.

 The known composition of the electrode coating for welding low carbon and low alloy steels, containing the following components, wt.

Titanium containing
concentrate 45-52
Marble 8-13
Mica Concentrate
muscovite rat 17-21
Ferromanganese 11-13
Aluminosilicate
sodium 2-5
Pulp 1-3
Ferromanganese grade FMn-1, FMn-1,5 is used as a deoxidant in this coating [1]
The coating provides welded joints at the level of GOST 9466-75. Electrodes with the above coating have good technological and welding-technological properties.

 However, the mechanical characteristics of the weld metal can be improved by increasing the toughness and elongation while maintaining the ultimate tensile strength. In this case, the spatter coefficient is 5%. The mechanical characteristics of electrodes coated with the specified composition can be improved due to more complete release of metal and gas inclusions from the weld metal.

This occurs as a result of creating the optimal ratio of Mg60 ₃ CaCO ₃ carbonates and deoxidants Al, Ti, Si, Mn, which entails a decrease in the content of silicon oxides in the metal and slag phase.

 Closest to the invention is the composition of the electrode coating [2] mainly for welding low carbon and low alloy steels, containing the following components, wt.

The component contains
chewing titanium oxide 35-55
Metal Carbonate 5-20
Ferromanganese 10-15
Pulp 1-3
Phlogo Concentrate
pit 8-35
Electrodes with a coating of this composition provide guaranteed characteristics of the mechanical properties of the deposited metal and are technologically advanced to manufacture, however, the plastic properties of the coating and the conversion coefficient of manganese from the coating to the weld metal are not high enough and can be increased. Particularly in need of improvement are characteristics such as arc burning stability and spatter ratio.

 The purpose of the invention is to increase the technological properties of the coating, welding and technological properties of the electrodes and reduce the cost of their manufacture.

 This is achieved by the fact that the electrode coating, mainly for welding low-carbon and low-alloy steels containing titanium oxide concentrate, metal carbonate, cellulose, manganese deoxidizer and phlogopite concentrate, introduces a complex ferroalloy containing Fe, Mn, Si, Al, as a deoxidant Ti, as well as a small amount of aluminosilicate to preserve the plastic properties of the coating in the following ratio, wt.

The component contains
chewing titanium oxide 30-55
Metal Carbonate 5-20
Ferroalloy 10-15
Pulp 1-3
Phlogo Concentrate
pit 8-35
Aluminosilicate
sodium 2-10
When this ferroalloy contains the following elements, wt.

Mn 26-32
Al 4.0-5.5
Si 4-8
Ti 13-22
Fe rest
C ≅ 0.5
S ≅ 0.1
P ≅ 0.22
A small amount of impurities of other elements do not have a significant effect and are not given in the composition. Due to the fact that the complex ferroalloy contains up to 22 wt. titanium, which is the most preferred deoxidizer, a well deoxidized degassed weld metal with high plastic properties is formed.

 At the same time, the total silicon content in the ferroalloy and phlogopite concentrate is lower than the total content in the mica muscovite concentrate and ferromanganese grade FMn-1, FMn-1,5.

 As a result of obtaining the optimal ratio of deoxidizers and metal carbonates, short, easily separable slags are formed. Arc excitation is stable, which allows to improve welding conditions when performing vertical and ceiling seams.

 The price of ferroalloy is 10-30% lower than the price of ferromanganese grade FMn-1.0, FMn-1.5, since ferroalloy is the result of the 1st stage of a 2-stage process in the smelting of FMN-1.0 and FMn-1.5. In addition to the above, with constant grinding conditions, the dust content of the particle size distribution decreases by 1.5-2 times and reaches the norm.

 For experimental verification of the proposed composition, a pilot batch of electrodes was produced in a volume of 25 tons. The composition of the electrode coating included the following components in the ratio, wt.

Option I
Rutile concentrate
Rat GOST 22938-78 45
Feldspar
PShK GOST 4422-73
(sodium aluminosilicate) 10
Marble electrode
GOST M-97B
4416-73 10
Phlogopite mica
ground electronic
native SFE-1
TU36.44.1578-90 18
Ferromanganese
with titanium
TU14-141-19-92 14
Cellulose EC 3
Option II
Rutile concentrate
Rat GOST 22938-78 45
Feldspar
PShK GOST 4422-73 10
Marble electrode
ny M97B 10
Mica phlogopite
ground electronic
native SFE-1
TU 36.4415-18-90 16
Ferromanganese
with titanium
TU14-141-19-22 16
Cellulose EC 3
As a deoxidizer, a complex ferroalloy of the following composition was used, wt.

Mn 31.6
Ti 17.0
Al 4.9
Si 6.7
S 0.01
P 0.22
As a component containing titanium oxide, a rutile concentrate, metal carbonate marble, was introduced. Crimping was carried out on a Sv-08A wire with a diameter of 4 mm, the coating mass coefficient, K _mp 28-34%
As a binder used liquid potassium-sodium glass with the following characteristics:
Module 2.87
Density 1.46
37 s viscosity
at a temperature of 19 ^about C.

 When crimping, high plasticity of the coating mass and good appearance of the coating were noted.

 Quality assessment was carried out in accordance with GOST 9466-75.

 The results obtained are summarized in the table.

 The ease of arc excitation and the high stability of its burning in all spatial positions are noted. Good weld formation is observed due to the lower silicon oxide content in the coating composition compared to the base.

Claims (1)

1. COMPOSITION OF ELECTRODE COATING mainly for welding low-carbon and low alloy steels, containing a component including titanium oxide, metal carbonate, cellulose, concentrate phlogopite and manganese deoxidizer, characterized in that the composition additionally contains sodium aluminosilicate, and a complex ferroalloy is introduced as the deoxidizer in the following the ratio of components, wt.%:
Component containing titanium oxide - 30 - 55
Metal Carbonate - 5 - 20
Ferroalloy - 10 - 15
Cellulose - 1 - 3
Phlogopite Concentrate - 8 - 35
Sodium Aluminosilicate - 2 - 10
while the ferroalloy contains the following components, wt.%:
Manganese - 26 - 32
Aluminum - 4 - 5.5
Silicon - 4 - 8
Titanium - 13-22
Carbon - Not more than 0.5
Sulfur - Not more than 0.1
Phosphorus - Not more than 0.22
Iron - Else
2. The composition according to claim 1, characterized in that it additionally contains iron powder in an amount of 8 to 10 wt.%.

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