JPS6117396A - Flux used by electroslag welding process employing plate electrode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to welding technology and in particular to fluxes used in electroslag welding processes in which the plate electrodes are melted under the influence of an external magnetic field with high magnetic induction.

Electroslag welding using a grate electrode should be understood as electroslag welding in which a grate with a large cross section corresponding to the size of the gap between the parts to be welded is used as an electrode.

The deleterious effect of external magnetic fields on welding processes can be seen in non-ferrous metallurgy and in the chemical industry where external magnetic fields act when installing heavy aluminum wires in electrolytic cells used.

(Capital) Advanced Technology and Problems] Until now, the problem of performing a welding process using an external magnetic field has not been satisfactorily solved. Manual electric arc welding using tungsten electrodes and 7 lux in an inert atmosphere used for assembly requires high-quality welding and Must not be. Such parts are generally advantageously welded together by means of a grate electrode. However, welding processes carried out with strong external magnetic fields are unsuitable. This is due to the nature of electroslag welding, where the metal is melted by the heat of the molten slag heated by the passing current (5l
ovar-spravochnik po 5vark
a"Naukova Dumka" Publishing, 1974, p. 187).

The external magnetic field acts on the liquid slag and metal as a current-carrying conductor, creating melt flows that destabilize the process and cause large fluctuations on the welding bath surface.

It has been found that a satisfactory weld joint can be obtained if the weld bath surface swings less than 15' out of plane. If the shaking angle of the welding bath surface exceeds 15°, incomplete melting on one side will occur as well as scattering of the welding bath.

USSR Inventor Certificate No. 1.49166″″0tkriti
a.

izobreteniaypromyshlennye
obraztay ztovarnyie zn
aki” No. 15, 1962, is known in the art. This method is known in the art for electroslag welding using plate electrodes. It incorporates a mold apparatus having a bottom plate with a top and outlet strap that maintains the slag bath in stages. A portion of the welding flux is charged into the recess of the bottom plate and a plate electrode is then introduced into the gap. The electrode is connected to one end of the welding current source, which in turn connects the workpiece to be welded and the end of the base metal blank.The welding process begins with the bottom of the recess touching the end of the electrode, and an electric arc melts the flux. is generated to form a slag bath.

The molten slag, which is a conductor of current, moves the arc and conducts the electroslag process where the welding current passes through the molten slag, causing the molten slag to overheat.

In the region where the overheated slag contacts the electrode and the end of the member, the heating of the molten slag generates localized strong heat in the welded member and the electrode, melting the material of the member and the electrode. The molten metal and molten slag disposed thereon form a welding bath. A side section of the welding bath is formed below the non-molten metal at the end having the shape of a root surface whose width corresponds to the depth of the melting zone at the end.

As the metal melts down into the gap, the height of the melt increases continuously, thereby heating and melting the new part end and electrode.

As a result, the root surface and the welding bath move upward continuously. At the same time, the metal solidifies in the lower part of the welding bath to form a weld. As the welding bath advances, a weld is formed. The resulting weld is of high quality due to the uniformity of the metal and good fusion of metal and component metal.

However, when this method is carried out using an external magnetic field, for the above-mentioned reasons, large shaking of the welding bath surface (90° or less with respect to the horizontal plane) accompanied by splashing of the welding bath from the gap occurs. The above phenomenon is caused by a relatively large opening in the welding bath surface, so the magnetic field of the electrode created by the welding current cannot eliminate the influence of the external magnetic field over the entire area of the opening in the welding bath, causing the melt to flow up and down. without being able to prevent
Its motion causes an angular swing of the opening of the welding bath surface.

The term "opening of the weld bath surface" is used to denote a part of the melt surface, defined by the projection in the gap region with respect to this surface.

The term "gap area" is used to indicate the area defined by the ends of the parts to be welded, which area is equal to the product of the width of the ends and the width of the gap.

Due to the angular oscillation of the opening of the welding bath surface, the area of wetting one of the edges to be welded with melt increases and the welding current is therefore redistributed over the edge. This is due to incomplete melting of one of the ends and strong melting of the other end. As a rule, the root surface requires a slightly sloped profile so that the melt previously confined by the root surface can be moved under the action of an external magnetic field.

This causes angular shaking of the entire surface of the welding bath and scattering of melt from the gaps.

A gap large enough to adjust the area of the opening in the welding bath surface is necessary to prevent the creation of undesirable turbulence in the welding bath. This is because the reduced gap prevents the heating of the slag-forming slack from actively escaping gas and fills the welding bath with gas phase.

The term "slag-forming flux" is used herein to refer to the welding flux used to create the slag bath.

The active outflow of gas in the welding process quickly causes the used flux to easily boil and volatile compounds to flow out under the action of high welding temperatures. Such a flux may contain, for example, the following components in weight percent: Lithium fluoride... 20 to 22 Sodium fluoride... 28 to 30
There is a flux for welding aluminum that contains potassium chloride...15 to 20 and sodium chloride...30 to 35.

The object of the present invention is to provide a flux for use in the electroslag welding process using a grate electrode, which is achieved by optimizing the size of the opening in the welding bath surface and increasing the boiling temperature of the flux. Characterized by stability in external magnetic fields.

[Problems to be Solved by the Department] The above purpose is to produce a flux which is used in welding and which contains lithium fluoride and sodium fluoride, which according to the present invention further contains potassium fluoride and calcium fluoride in the following weight percentages: Lithium chloride... 60.0 to 90.0
Sodium fluoride... 5.0 to 20.0 Calcium fluoride... 1.0 to 5.0 Potassium fluoride... 4.0 to 15.0 This is achieved by a flux containing the ratio.

The temperature of the slack is higher than the working boiling temperature of electroslag welding, which sharply reduces gas outflow during the welding process and does not require large gaps between the ends of the parts for gas venting. This makes it possible to reduce the open area of the welding bath surface and, as mentioned above, stabilize the welding process in external magnetic fields.

Furthermore, the above objective was to obtain a ratio between calcium fluoride and sodium fluoride of 1:5 and a ratio of the compounds as follows: lithium fluoride.
・・60.0 to 90.0 sodium fluoride・
・・5.0 to 20.0 calcium fluoride・
... 1.0 sili, 4.0 potassium fufluoride...
- Achieved by a flux that is 4.0 to 15.0% by weight.

The above ratio of calcium fluoride and sodium fluoride is such that the flux to the metal to be welded is most activated.

According to the present invention, the horizontal cross-sectional area "A" of the electrode and the horizontal cross-sectional area "B" of the gap between # the members to be welded,
The relationship between the projection area of the welding bath surface on the horizontal plane (horizontal cross-sectional area of the welding bath surface) and C# is A:B:C: 1: (1,2 to 1.5): (2,5 to 4.5 ), the electric insulating material '5c is formed by applying it in advance to the end of the part to be welded, and the vertical movement of the side surface of the welding bath surface is restricted by the movable root surface and by the magnetic field of the electrode relative to the horizontal plane. The swing angle is maintained in the range of 0 to 15 degrees, and the side part is 40 to 7 degrees of the surface area of the welding bath.
It is preferable to set the number to 5.

The above A knee B: C ratio is determined by the stability of electroslag welding when an external magnetic field is applied. The ratio of the horizontal cross-sectional area of the electrode to the horizontal cross-sectional area of the gap is to provide an open surface of the slag bath, and the ratio of the horizontal cross-sectional area of the electrode to the horizontal cross-sectional area of the welding bath is to sufficiently melt the end surface of the workpiece to be welded. It's about letting people know. Horizontal cross-sectional area C of the welding bath
is larger than the slag bath surface by the molten area on the end face of the welded part.

The above electroslag welding method using a plate electrode provides a stable welding method in an external magnetic field,
The size of the open area on the surface of the welding bath in the above proportions of the areas A, B, and C is such that the magnetic field of the plate electrode eliminates the influence of a strong external magnetic field and prevents the melt from scattering within its limits. It becomes possible. This is the case if the movable root surface has a sufficient size and suitable shape that the side parts of the welding bath do not move under the influence of external magnetic fields.

The movable root surface is formed by pre-applying an insulating material to the end of the welded part, and the breakdown temperature (T,) of the insulating material is 1.0% higher than the melting temperature (Tm) of the metal of the welded part.
Advantageously, it is greater than 1 to 1.5 times.

Forming the movable root surface in any shape, such as a horizontally extending shape, can be supported by the root surface on the side of the weld bath surface even when swinging at a reliable large angle under an external magnetic field. I can do it. The root surface requires a predetermined shape in order to limit the intensity of the heating action by the area where the insulating material wets the non-molten metal with the melt and thus by a predetermined member. If Td(1, I Tm), the electrical insulation material disappears above the surface of the slag bath, making it impossible to obtain a root surface with a predetermined shape.
If >1.5 Tm, the electrical insulation will withstand temperatures at which the metal bath reaches temperatures with slag in the melt.

The electrical insulating material is an inorganic compound, namely Z 1 # Na
+ to + Mgl Cat Zn+ n, salt of At,
or a mixture thereof and/or an oxide thereof and/or a carbide thereof. This is because such compounds have the necessary thermal properties.

Advantageously, the electrical insulation material comprises an organic compound such as cellulose, veneer, organic resin. This is because such materials have the necessary thermal properties and, moreover, adhere easily to the surfaces of the ends of the parts to be welded.

〔Example〕 The present invention will be described in detail below based on the drawings.

The method according to the invention is carried out in a magnetic field with a magnetic induction of less than (40-45,).1O-3T.

Components 1 and 2 to be welded, such as busbars
The ends of the material 3 are covered with an electrically insulating material 3 whose breakdown temperature (T, ) exceeds the melting temperature of the component by a factor of 1.1 to 1.5. More than 50% of the end face area of the member is covered with an electrically insulating material, and the ends of the member are spaced apart.

Assemble parts 1 and 2 into the mold apparatus. The mold apparatus consists of a bottom plate 4 with a recess 5, a side mold 6 and an upper exit strap 7. In the hollow 5, the following ingredients 7 lithium fluoride...
60.0 to 90.0 Sodium fluoride...
5.0 to 20.0 calcium fufluoride...
1.0 to 5.0 potassium fluoride...4
．． Charge a portion of the slag forming a flux of 0 to 15.0.

Next, the grate electrode 8 is introduced into the gap. The electrode 8 is connected to one of the terminals of a welding current #t (not shown), and - the phallic welding members 1, 2 and the bottom plate 4 are connected to the other terminal of the same current source.

Set members 1 and 2 so that a gap is formed between them,
The area “B′” is the area of the horizontal cross section of the electrode =A”
:B=1 :(1,2-1,5).

Welding is started by bringing the bottom of the depression 5 into contact with the end of the electrode 8, thereby creating an electric arc to melt the flux portion and form a slag bath 9. The molten slag moves the arc to induce the electroslag process. The welding current passes through the molten slag causing it to overheat. In the areas where the melt is in contact with the electrodes and the ends of the part, the metal melts intensely and flows into the recess 5.

A molten metal wire solution bath 10 is formed with a slag layer (bath) on top of which the sides of the bath 10 are formed below non-molten metal parts in the form of shoulders 11 and 12. Note that the width of the root surface corresponds to the melting depth at the end.

The horizontal cross-sectional area of the area "A" and the electrode is 1:(2,5-4,5) in the horizontal cross-sectional area 1C# of the welding bath surface.

This is achieved by controlling the following welding method functions: ■ and U, where W 1. s·■ is the welding current value, and Ui,s is the open stroke voltage of the welding current source.

Since the ends of the members 1 and 2 are covered with the electrically insulating material 3, the shape of the movable root surfaces 11 and 12 is substantially horizontal. This is because the area of intense heat action of the slag bath 9 on the metal of the parts 1 and 2 is limited by the area of simultaneous contact between the slag bath and the parts.

The external magnetic field acts on the conductive welding bath 10, thereby initiating bath movement. Since the proportions of areas A', B, and C are as described above, the size of the open part on the surface of the welding bath 100 is such that the magnetic field of the great electrode eliminates the influence of external magnetic fields, and the movable root surfaces 11 and 12 are such that the sides of the welding tower are exposed to the outside. It has sufficient size and shape so that it does not move under the influence of a magnetic field. This allows the swing angle of the welding bath to be maintained in the range 0 to 15 degrees from the horizontal plane, thereby eliminating the influence of undesirable external magnetic fields. Once the welding bath becomes stable, the end metal and electrode melt and the welding bath moves up into the gap as the root surfaces 11 and 12 move. At the same time, the metal solidifies in the lower part of the welding bath to form a weld.

Example 1 The method of the present invention was applied to a thick aluminum busbar 1 with 140 questions.
and 2 were used for welding in a magnetic field using magnetic induction 40.IOT'. The ends of the busbars to be welded were completely coated in advance with a NaCt-based electrical insulation material. Destruction temperature of material 3 (
T, ) was 800 to 900°C, which is 1.2 to 1.3 times the melting temperature of aluminum, 660°C. The aluminum welding grate electrode 8 was 205 m thick. The width of the gap between the welded ends was set to 24 wm, and the weld width of the welded ends was set to 13 mm. The width of the plate electrode is approximately equal to the thickness of the material to be welded, 140 m, and the horizontal cross-sectional area A of the plate electrode is 140×20=2800wn. In addition, the horizontal cross-sectional area B of the gap between the parts to be welded is the product of the thickness of the aluminum busbar, 140 mm, and the gap width, 24 mm, that is, B, , = 1
40X24=3360 area. The projected area C of the welding bath surface on a horizontal plane is the sum of the horizontal cross-sectional areas of the gap of the welding material and the molten regions of the two end faces of the welding material.

That is, C= 3360 + 2 X 13 X 14
0 = 7000 ttan2.

Therefore, the ratio of A:B:C is 1:1.2:2.5
becomes.

According to the settings, bus bars 1 and 2 were set to form a gap of 24 mm width between the end faces.

Guess bars 1 and 2 were fitted with a molding apparatus comprising a bottom plate 4 with a recess 5, a side mold 6 and a top exit strap 7.

Since the boiling temperature of the slag-forming flux should be higher than the welding temperature of the aluminum busbar (T = 1200-1400°C), all blacks have the following weight components: Lithium fluoride... 60.0 Sodium fluoride... 20.0 Calcium fluoride...
5.0 Potassium fluoride... 15.0 was selected.

The boiling temperature (T, ) of the slag forming flux is 1500℃
Met.

A portion of the slag-forming flux was charged into the depression 5. Next, the plate electrode 8 was introduced into the gap and the electroslag process was started.

To obtain a predetermined fusion depth, the welding method is as follows: Iw=7. The test was carried out under the following conditions. Shoulders 11 and 12 formed during the welding process
Is t't horizontal? ·Ta. The rebound angle of the weld bath surface was within 15''.

As a result of this welding method, a high quality welded part with a width of 50 m was obtained.

Example 2 Four 140mm thick I/cots made of an aluminum-based alloy containing 5.8% magnesium
It was used for welding in a magnetic field with a magnetic induction of 0.10-3T.

The melting temperature of (Tm) was 654°C. Na5AtF6 was used as an electrically insulating material covering the ends of the member. The breakdown temperature (Td) of the material was 1000°C.

Grate electrode thickness... 20a+A:B:C area ratio... 1:2.3:3.5 Gap width...
・ 26 Melting width of end face... 22 questions Welding conditions: IW... 9.5kA U,... 42V l Hibiki a+ Working temperature (TW)... 1200 to 14
The 00°C flux had the following components in weight%.

Lithium fluoride... 90.0 Sodium fluoride... 5.0 Calcium fluoride... 1.0 Potassium fluoride... 4.0 The boiling temperature (T,) of 7 lux is 1510°C. Ta.

The assembly of the molding equipment source and the start-up of the electroslag process were carried out according to Example 1. The swing angle of the welded yukata was within 15° with respect to the horizontal plane. High quality 701+II+
A weld of + thickness was obtained.

Example 3 The method of the invention was used to weld forged pieces in a magnetic field.

The magnetic induction value was 40·10-3T.

The forged piece and electrode were made of CnO, 10; silO, 5
4; Mn+1.10: Cr, 17.75; Ni
, 9.3;T.

Made from iron-based material containing 0.51;

The melting temperature (Tm) was 1385°C.

The ingot was 200m thick.

A mixture of MgSO4 and At203 was used as the coating material at 1=
It was used at a ratio of 1:1.

The breakdown temperature (Td) was 1530°C.

A coating was applied to 50 inches of each upper end area (Figure 2). This makes the welding more intense while maintaining the horizontal shape of the shoulder at the start of welding.

Thickness of great electrode... 12mmA:B:C
Area ratio... 1:1.5:4.5 Gap width...
・ Melting depth of the 18 helical end... 18 m Welding conditions ■7... 6 kA U... 38 V l ・S... Working temperature (TV)... 1540℃ The selected flux is the following weight percentage The components were 0 Lithium fluoride... 70.0 Sodium fluoride... 20.0 Calcium fluoride...
4.0 Potassium fluoride... 6.0 The boiling temperature (T) of Blacks was 15.20°C.

Installation of the mold equipment and initiation of the electroslag process was carried out according to Example IK. The rebound angle of the surface of the welding bath was within 15° with respect to the horizontal plane.

A high quality 54 mm thick weld was produced.

Example 4 A method of the invention was used to weld forged parts in a magnetic field.

The magnetic induction value was 40·10-'T.

Forged parts and electrodes are based on ferronickel and Cto
,04;siIO,51;Mn+0.27
+Cr.

19.6; Ni, 27.8; B, 4.7
8; Mo, 2.90; Nb, 1.05: The remainder was manufactured from an alloy containing Fe.

The melting time (Tm) was 1320°C.

The steel ingot was 100+w thick. Na2 as coating material
O, K2O, Li2CL CaO at 1:1. :1:1 ratio.

The fracture temperature (T, ) was 1440°C.

For economical purposes, only the ends to be welded were coated to cover 50% of the area. This means that the shape of the movable root surface has become nearly horizontal.

Thickness of the great electrode... 10m + Ratio of A:B:C area... 1: 1.3: 3.5 Gap width
... Melting depth at the 13sog end ...
11+W welding conditions IW... 20 kA tr... 36V Working temperature... 1500°C The flux had the following weight % components.

Lithium fluoride... 85.0 Sodium fluoride... 4.0 Calcium fluoride... 4.0 Potassium fluoride... 7.0 The boiling temperature (T,) of the flux was 1515°C .

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The swing angle of the surface of the welding bath was within 15° with respect to the horizontal plane. A high quality 355m wide weld was produced.

Example 5 The method of the invention was used to weld busbars in a magnetic field.

The magnetic induction value was 4o·10-'T.

Forged parts and electrodes were made of copper.

The melting temperature (Tm) was 108 (l).

The busbar was 100m thick.゛The roof covering material is NaF.
Based on.

The fracture temperature (T, ) was 1420°C.

Thickness of great electrode...20m Ratio of A:B:C area...1:1.5:
4.5 Gap width... 3 (1 m) Welding conditions ■7... l, OkA tri... 44V Working temperature... 1450°C The flux had the following weight components.

7) Lithium chloride river 90.0' Sodium fluoride... 5.0 Calcium fufluoride... 1.0 Potassium fluoride...4.0 The boiling temperature (T, ) of the flux was 1505°C.

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The swing angle of the surface of the welding bath was within 15° with respect to the horizontal plane. A high quality 90-width weld was produced.

Example 6 The method of the invention was used to weld aluminum busbars in a magnetic field. Gesper 1 was made in the form of an ingot, while Buspar 2 was made in the form of a set of sheets.

The magnetic induction value was 40·10-'T.

The Guesbar was 140cm thick.

The melting temperature (Tm) was 660°C.

The cladding was a 2+m thick plywood sheet.

The breakdown temperature (T,) was 730-750°C.

The end of the bus bar 2 was completely covered, and the end of the bus bar 1 was also covered from the top to the center (Fig. 5). This is because the heat removal values of bus bars 1 and 2 are different.

Thickness of great electrode... 20m Ratio of A:B:C area... 1: 1.2: 2
．． 5 Gap width... 24m Melting depth at the end... 13m Welding conditions I... 7.0 kh U,... 44V l Heat working temperature (Tw)... 1200℃ Flux is It had the following weight components.

Lithium fluoride... 75.0 Sodium fluoride... 15.0 Calcium fluoride...
3.0 Potassium fluoride... 7.0 The boiling temperature (T) of the flux was 1500° C., and the installation of a mold device and the start of the electroslag method were carried out based on Example 1. The swing angle of the surface of the welding bath was within 15° with respect to the horizontal plane. A high quality 50cm wide weld was produced.

Example 7 The method of the invention was carried out in a magnetic field. The magnetic induction value is 40.
It was 10T. The materials of the forged parts and electrodes are based on iron, C, 0,10; 0.54: Mn, 1.
10: Ctrl 7.75: Ni, 9.3
:Ti.

0.51: The alloy contained the remaining F.

The melting temperature (Trn) was 1320°C.

The thickness of the forged part was 1405 m.

The steel ingot was 100 m thick.

The coating material was rosin with added CaO.

The fracture temperature (T, ) was 1530°C.

Thickness of great electrode... 12m + Ratio of A:B:C area... 1: 1.5: 4.5 Gap width
... 18 m Melting depth at the end ... 18 + m Welding conditions ■, ... 6 kA Ui, s, ... 38 V Working temperature ... 1540°C The flux had the following weight i% components.

Lithium fluoride... 65.0 Sodium fluoride... 20.0 Calcium fluoride...
5.0 Potassium fluoride... 10.0 The boiling temperature (T, ) of flux was 1550°C.

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The swing angle of the surface of the welding bath was within 15° with respect to the horizontal plane. A high-quality 54-gate wide weld was manufactured.

Example 8 The method of the invention was used to weld forged parts in a magnetic field.

The magnetic induction value was 40.10T.

The forged parts and electrodes were manufactured from an aluminum-based alloy containing 5.8% magnesium.

The melting temperature (Tm) was 1320°C.

The ingot was 140 pieces thick.

The coating material was a cellulose-based material and had a failure temperature (T,) of 730°C.

Thickness of plate electrode...20 Ratio of A:B:C area...1: 1.3:3.
5 Gap width... 26 Melting depth at the end of the weld... 22 Welding conditions ■1... 9.5kA Ul, s,... 42V Working temperature (Tw)... 1100℃ Flux is The components were in the following weight %.

Lithium fluoride... 7.5.0 Sodium fluoride... 15.0 Calcium fluoride...
3.0 Potassium fluoride...7.0 The boiling temperature (T, ) of the flux was 1490°C.

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The oscillation angle of the surface of the welding bath was within 15" with respect to the horizontal plane. High quality 70yan thick welds were produced.

Example 9 The method of the invention was used to weld forged parts in a magnetic field.

The magnetic induction value was 40.10T.

Forged parts and electrodes are made of Cr based on ferronickel.
O,04;Sir O,51;Mn+ 0.27;C
r.

19.6; Ni, 27.8; B, 4.78;
An alloy containing W, 2.90; Nb, 1.05; remainder Fe) was produced.

The melting temperature (Tm) was 1320°C.

The ingot was between 100 mm thick.

The dressing material is Getinax.

The fracture temperature (T, ) was 1460°C.

Thickness of plate electrode...10 Ratio of A:B:C area...1: 1.3: 3
．． 5 Gap width... 13m + fusion depth at the end... 11 Welding conditions ■,... 2.0kA Ui, s,..." 36V Working temperature... 1500℃ The flux is as follows in weight%. It was an ingredient.

Lithium fluoride... 75.0 Sodium fluoride... 15.0 Calcium fluoride...
3.0 Potassium fluoride... 7.0 Boiling temperature of flux (T) 1.510℃ tared.

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The swing angle of the surface of the welding bath was within 15° with respect to the horizontal plane. A high quality 35+m++ wide weld was produced.

Example 10 The method of the present invention was used to weld Gess bars in a magnetic field.

The magnetic induction value was 40.10T.

The ingot and electrodes were made from copper.

The melting temperature (Tm) was 1080°C.

The ingot was 100m thick.

The covering material was Tex Dryde.

The breakdown temperature (T, ) was 1420C.

Great electrode thickness...20rtanA:B:C
Area ratio... 1 : 1.5 : 4.5 Gap width... 30 Edge fusion depth... 30I+Il++ Welding conditions ■,... 10kA U,... 44V 1.11 ° Working temperature (Tw)... 1450°C Franks had the following components by weight.

Lithium fluoride... 80.0 Sodium fluoride... 10.0 Calcium fluoride...
2.0 Potassium fluoride... 8.0 Frank's boiling temperature (T) was 1505°C.

The installation of the mold equipment and the start of the electroslag process were carried out according to Example 1. The swing angle of the surface of the welded part was within 15° with respect to the horizontal plane. High quality 90Ill11
Produced thick welds.

〔Effect of the invention〕

The fluxes used in the above-mentioned electric slag welding process are utilized for welding electrical equipment, especially heavy conductors in non-ferrous metallurgy and the chemical industry. The welding method is carried out in a region where a strong magnetic field is generated, depending on the equipment.

[Brief explanation of the drawing]

FIG. 1 is a general front view in which a member to be welded is incorporated into a molding device for carrying out the electroslag welding method according to the present invention. FIG. 2 is a diagram illustrating a part to be welded installed in a molding device, and the part to be welded is covered with an electrically insulating material. FIG. 3 is a plan cross-sectional view of a member to be welded installed in the mold device, and the member is coated with an electrically insulating material. FIG. 4 is a plan sectional view of one member, one monolith member, and the member assembled in a mold device. FIG. 5 is a front sectional view incorporating a molding apparatus coated with an electrically insulating material, such as when welding materials with different heat removal. 1.2... bus bar, 4... bottom plate, 5... recess,
6... Side mold, 7... Upper exit strap, 8...
...Great electrode.

Claims (1)

[Claims] 1. In a flux containing lithium fluoride and sodium fluoride; The flux has the following weight %: Lithium fluoride...60.0 to 90.0 Sodium fluoride...5. 0 to 20.0 Calcium fluoride...1.0 to 5.0 Potassium fluoride...4.0
15.0 and further contains potassium fluoride and calcium fluoride. 2. The ratio of calcium fluoride and sodium fluoride is 1
:5 and the flux components are in the following weight% ratio: Lithium fluoride...60.0 to 90.0 Sodium fluoride...5.0 to 20.0 Calcium fluoride...1.0 or 4.0 Potassium fluoride...4.0
15.0 to 15.0.