KR20040028000A - Wire typed welding rod and manufacturing process thereof - Google Patents

Abstract

PURPOSE: A wire type welding rod and a method for manufacturing the same are provided to improve welding quality by uniformly forming welding arc and to allow the wire type welding rod to be easily wound around a bobbin. CONSTITUTION: A steel strip(2) of a wire type welding rod(1) is wound around a bobbin. The steel strip(2) is fed into primary and secondary molding devices by means of a pay-off device. At this time, a cleaning process is carried out in order to remove impurities from a surface of the steel strip(2). The steel strip(2) passes through a linear unit before the steel strip(2) is introduced into the primary and secondary molding devices so as to allow the steel strip(2) to be formed in a straight line. The steel strip(2) passes through a plurality of rollers so that the shape of the steel strip(2) is changed from a rectangular shape into a trapezoid shape.

Description

Wire type welding rod with built-in flux and manufacturing method thereof {Wire typed welding rod and manufacturing process}

The present invention relates to a wire-type welding rod with a flux embedded in the field of heavy industry such as automobiles and shipyards, and a method for manufacturing the same.

In order to join the iron plate and the iron plate are joined by melting the joining portion, in this case a welding rod is used to fill the space formed between the base material.

In order to prevent the electrode from being oxidized to weaken its strength because the electrode is usually melted and adhered under a high temperature atmosphere, as shown in FIG. 6, flux (Flux, 32) is applied to the outer surface of the core wire 31 of the electrode 30. The coating is applied to cover the surface of the base material and the core wire 31 which melts during the welding process to prevent oxidation and to improve the quality of the arc by improving the characteristics of the arc.

However, in the case of the rod-shaped welding rod 30, the length is only about 30 ~ 50 ㎝, the welding rod 30 is quickly consumed to stop the work in the middle of the welding operation and continue to replace the new welding rod 30 to work Since the speed is very slow and the welding must be continued from the previous welding work point at the time of stopping the work, there is a problem that the welding quality is greatly deteriorated according to the temperature difference or the degree of overlap of the melt, which has been a major obstacle to the welding automation.

The reason why the rod-shaped electrode 30 is not an obstacle to welding automation is because when the core wire 31 is continuously wound around the drum, the layer of flux 32 surrounding its outer surface is detached. This is due to the fact that it has no choice but to take a short straight line.

For this reason, in recent years, the flux 40 is built in the central core portion as shown in FIG. 7 for the automation of welding work, and the round core material 41 is wrapped around the outer periphery of the flux 40 in a circular line. Wire-shaped welding rods 42 incorporating the flux of the form in which the shape is formed have been developed and used.

When the welding rod 42 has such a structure, the welding rod 42 is continuously formed in a long wire shape and wound around the outer circumference of the bobbin to be used for welding. Since the flux 40 is safely maintained and there is no fear of detachment, the supply of the electrode 42 can be continuously performed, thereby bringing about an innovation in welding automation.

The wire-shaped welding rod 42 incorporating the flux 40 is manufactured through a manufacturing process as shown in FIG. 8, wherein a flat iron band 43 continuous in the longitudinal direction is wound around the bobbin 44 to form a vertical roller ( When the 45 and 46 are supplied through the molding apparatus section 47 which is continuously arranged, the flat iron band 43 becomes the U-shaped bending member 48 in the first half section of the molding process, and the flux supply device ( While passing through 49, the flux 50 is supplied to be received in the recess of the U-shaped bending member 48, and when passing through the second half of the molding device section 47, the U-shaped bending member 48 is completely rolled up. By forming the circular core material 51 to protect the flux 50 embedded in the core portion 52 of the center, the circular core material 51 is stretched while passing through the stretching device section 53 to the thickness of the desired standard Wire-weld with internally completed and completed flux (42) It will be formed, which will be used to withdraw the continuous welding electrode 42 is fed to a number of plant automatic welding process is wound on a bobbin 54.

However, in the case of the welding rod 42 manufactured through the above process, the joint end 55 of the circular core material 41 formed by rolling the flat iron band 43 in a circular shape is a simple one-shaped seam as shown in FIG. 7. The end 55 is opened to form a gap, or to have a double overlapping seam 56, or to have a seam 57 immersed inward, so that a welding arc does not uniformly occur in all radial directions during the welding operation, thereby melting The spreading amount of the metal is not uniform, which causes the welding quality to be deteriorated, and it is difficult to wind the bobbin.

Accordingly, the present invention has been proposed in view of the above point, and its object is to have a constant thickness without allowing gaps in the joint ends of the circular core wires surrounding the flux, so that the welding arc is constant, thereby greatly improving the quality of the welding. SUMMARY OF THE INVENTION An object of the present invention is to provide a wire-shaped welding rod having a flux in which a bobbin is easily wound and which has a structure in which no loss of flux occurs during winding.

In order to achieve the above object, the present invention is a wire-shaped welding rod containing a flux, and a flux consisting of a circular core material wrapped around the flat iron strip in a circular shape so that the flux is kept in the central core portion,

Both ends of the flat strip is a parallelogram shape chamfered inclined in the same direction, it characterized in that the inclined surfaces of both sides when the circular core is rolled in a circular shape to have a joint end in close contact with each other.

The method for manufacturing the electrode is a step of supplying a flat iron band;

A primary forming step of continuously passing a flat iron strip between a pair of upper and lower rollers to gradually increase the amount of bending deformation to form a U-shaped bending member;

A flux supply step of supplying flux into the recesses of the U-shaped bending member;

A secondary forming step of successively passing a U-shaped bending member accommodating the flux between a pair of upper and lower rollers to gradually increase the amount of bending deformation so that the flux is rolled in a circular shape so as to retain the flux in the core portion to form a circular core material;

An extension process of pulling the circular core in the longitudinal direction and stretching the rod to a desired thickness to obtain a completed electrode;

A winding step of winding the stretched electrode on the bobbin; In the method for producing a wire-shaped electrode with a flux built-in, prior to the first forming step And forcibly passing a roller having a cylindrical circumferential groove to plastically deform to a parallelogram shape such that both end portions of the flat iron strip are inclined surfaces.

1 is a cross-sectional view showing a wire-shaped electrode with a flux according to the present invention

Figure 2 is a schematic diagram illustrating the process for manufacturing a welding rod of the present invention

3 is a view showing a step-by-step change process of forming a welding rod of the present invention

4 and 5 are views showing the structure of a roller for rolling a parallelogram-shaped material of the present invention.

6 is a cross-sectional view of a conventional rod-shaped electrode

7 (a) to 7 (c) are cross-sectional views of wire-shaped welding rods incorporating a flux of a conventional structure.

8 is a view showing a manufacturing process of a wire-shaped welding rod incorporating a conventional flux

※ Explanation of codes for main parts of drawing

1: wire type electrode with flux

2: flat iron strip 3: bobbin

4,5 molding machine 6: forming rollers

7,8: roller 9: parallelogram material

10: Type circumferential groove 9A: Primary deformation material

11,12: inclined surface 13: U-shaped bending member

14 flux supply device 15 flux

16: groove 17: core portion

18: circular core material 19: joint end

20: drawing device 21: bobbin

Hereinafter, the configuration of the present invention will be described with reference to FIGS. 1 to 5.

The flat iron strip (2), which is an outer material of the flux-embedded wire welding rod (1), is wound around the bobbin (3) and supplied to the primary and secondary forming apparatuses (4) and (5) using a machine called pay-off. In this case, the washing process is selectively performed to remove various foreign substances such as rolling oil and chips on the surface of the flat iron strip 2, and when the cleaning process is performed, a lubrication function is performed on the surface of the flat iron strip. It is advisable to carry out the lubricant supply process as the material that can be removed is increased and the friction increases as it passes between the forming rollers in the forming process, which shortens the life of the forming rollers 6A, 6B -----. In addition, it is preferable that the flat iron strip 2 supplied to the primary and secondary molding apparatuses 4 and 5 passes through a straightening device to hold the bent material in a straight line and then enter the molding operation.

Thin rectangular flat iron strip (2) by rolling through a pair of upper and lower rollers (7A) (7B) (8A) (8B) up and down in the first half of the primary forming process by the primary forming apparatus (4). Is plastically deformed into a parallelogram material (9).

One side of the rollers 7A, 7B, and 8A, 8B is inclined to one side of the rollers 7B, 8A. A cylindrical circumferential groove 10A, 10B is formed, and the counter rollers 7A, 8B which rotate against each other have a smooth circumferential surface, so that the circumferential grooves of the primary rollers 7A, 7B are formed. 10A) passes through the primary deformable material 9A having the shape as shown in FIG. 3, and passes through the circumferential groove 10B of the secondary rollers 8A, 8B. It is plastically deformed into the parallelogram 9 of the inclined surfaces 11 and 12.

Thus, the plastically deformed parallelogram material 9 passes through the primary forming apparatus 4 composed of a plurality of upper and lower rollers 6A, 6B ---- and gradually increases the amount of bending deformation to form a U-shaped bending member 13. In this case, while the U-shaped bending member 13 passes the flux supply device 14, the flux 15 drop-fed from the flux supply device 14 is accommodated in the recess 16.

In this state, when passing through the secondary forming apparatus 5 composed of a plurality of up and down rollers 6D ....., the U-shaped bending member 13 is rolled up to form a perfect circle and the flux 15 in the core portion 17. Is to be formed of a circular core material 18 so as to be safely kept.

In this state, both side inclined surfaces 11 and 12 of the circular core material 18 of the welding rod 1A in the intermediate stage have a joint end portion 19 in contact with each other to form a boundary.

On the other hand, the electrode 1A of the intermediate stage is subjected to the stretching operation through the stretching device 20 to make the diameter of 1.2m / m, 1.4m / m, 1.6m / m mainly used in the welding machine of the desired diameter The finished welding rod 1 is obtained, which is continuously produced for a long time, so that the welding work is performed while winding the bobbin 21 and sending it to the work site where welding is required to continuously release it from the bobbin 21.

In the case of the completed welding rod 1, both inclined surfaces 11 and 12 of the joint end portion 19 are in close contact with each other, so that the gap disappears and the thickness is maintained almost the same as the other portions, so that the arcing or bias of the arc is generated. The gap is compensated for by the misalignment of the inclined surfaces 11 and 12 even if the seam end 19 is prevented or at least widened when the bobbin 21 is wound and removed. It is effective to reduce the leakage to the outside through the gaps 15) and to increase the winding speed.

Claims (2)

In the wire-shaped welding rod containing the flux and the flux consisting of a circular core material wrapped around the flat iron strip in a circular shape so that the flux is kept in the central core portion, Both ends of the flat iron strip are parallelograms chamfered inclined in the same direction, and when the circular core is rolled in a circular shape, the inclined surfaces on both sides have seam ends to be in close contact with each other. Mold welding rod. Supplying a flat iron band; A primary forming step of continuously passing a flat iron strip between a pair of upper and lower rollers to gradually increase the amount of bending deformation to form a U-shaped bending member; A flux supply step of supplying flux into the recesses of the U-shaped bending member; A secondary forming step of successively passing a U-shaped bending member accommodating the flux between a pair of upper and lower rollers to gradually increase the amount of bending deformation so that the flux is rolled in a circular shape so as to retain the flux in the core portion to form a circular core material; An extension process of pulling the circular core in the longitudinal direction and stretching the rod to a desired thickness to obtain a completed electrode; A winding step of winding the stretched electrode on the bobbin; In the manufacturing method of a wire-shaped welding rod containing a flux of Prior to the first molding process, a flat iron band A method of manufacturing a wire-shaped welding rod with flux, comprising performing a step of forcibly passing a roller having a circumferential groove of a die to plastically deform to a parallelogram shape so that both end portions of the flat iron strip are inclined surfaces.