JPS5950427B2 - Method and device for high-frequency welding flange material and web material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to welding associated with electrical resistance heating for joining edges of one material to faces of another material, and more particularly to a method for high frequency welding of flange material and web material. , as well as a device for implementing the same.

The present invention is most advantageously used for the continuous production of thin-walled open sections of steel and non-ferrous metals, such as T-shaped, H-shaped, etc.
It is mainly used when it is not possible from an economic point of view to produce such pieces by rolling, pressing or drawing methods.

Additionally, the invention can be used in a variety of technical fields, such as applying fins to pipes or welding panels using high frequency metal welding processes.

The process of continuous high frequency welding of metals is well known and widely used in the metallurgical industry for producing welded pipes from ferrous and non-ferrous metals.

This process is essentially based on the welding method proposed by Mr. A. V. Ulitovsky (see USSR Inventor's Certificate No. 72, No. 290 Classification 21, 29/30).
This method utilizes the "skin effect" and "edging effect" of alternating current flowing along the V-shaped gap between the edges to be joined. Successfully using high frequency welding to manufacture pipes
This has been encouraged, on the one hand, by the customary technical methods of pipe welding that have been used in the industry for many years, and on the other hand, by the edge assembly conditions and Conditions for high frequency current welding method (both edges are 1
This was facilitated by the fact that the two edges of the metal sheet were heated under exactly the same heating conditions. In addition, in the pipe manufacturing process, the edges themselves inherently form a certain V-shaped angle, and the apex is at the matching point of the edges. V formed between edges to be joined
A constant angle is a basic condition for uniform heating in high-frequency welding, so it is crucial that the pipe welds be of high quality. Unlike pipe welding, there are still limitations to the use of this welding method to manufacture general parts, even recently.

Most of the pieces are manufactured by rolling, and sometimes by pressing. This imposes some restrictions on the type and quality of the pieces. Generally, the mass production of thin-walled sections with wide flanges, T-shapes, variable thicknesses, and other shapes that are difficult to manufacture is limited by the complexity of their rolling. The special properties of the high-frequency welding process make it possible to substantially improve the conditions for producing the above-mentioned parts.

However, the success of this process will depend on whether critical challenges are resolved.

The open pieces (angular pieces, T-pieces, H-pieces, etc.) basically include a T-shaped joint between a web element and a flange element, the joint being essentially It will be understood that this is the object of welding. Unlike welding pipes, welding flange-type blanks to web-type blanks requires joining the edges of one sheet of web stock to a flat area of the other flange blank. From the point of view of radio frequency heating, the areas to be joined are in unequal and asymmetric conditions, and therefore, unless special heating techniques are used, the edges of the web material will overheat, while the flat edges of the flange material will overheat. The area becomes underheated. If the materials to be joined are not heated sufficiently and uniformly, the quality of the weld will be poor. Another point of view is to ensure a constant V-shaped angle where the image materials meet. Since the moment of resistance to bending the flange blank in the desired direction is less than the moment of the web blank, the simplest way to obtain the V-angle consists of bending the flange blank as it approaches the weld point. However, in order to maintain a constant V-shaped angle, it is necessary to stabilize the bent shape of the flange material. This involves resolving important issues. Yet another challenge relates to the need to create optimal temperature gradients in both the flat areas of the flange stock and the edges of the web stock.

This need arises because welded joints are attempted to be made by pressing together materials heated by high frequency current. Given the required temperature distribution, it is possible to obtain a welded joint with a preset shape and ensure a high quality weld during the deformation process of the materials when they are pressed together. Various methods are known to solve the above problems. It has been proposed to change the degree of heating of the picture material by increasing the distance between the contact point that supplies current to the flange material and the meeting point of the picture material (
July 18, 1974, IEEE Transact
iOnsOnIndustryAppllcatlOn
s〃, IA-10. ．． Tsuta 4, pages 485 to 49
Page 5 and U.S. Patent No. 2,821,619, Class 2
19-107). However, just by using this method, it is not possible to substantially increase the heating temperature of the flange material. A more promising approach is to use passive current concentrators to increase the heating temperature of the flange material and reduce the heating temperature of the web material.
(Soviet inventor certificate No. 287,722, classification B23Kl3
/02). According to this solution, an insert (current concentrator) made of highly conductive non-magnetic material is inserted into the gap between the materials to be welded.

This insert is placed to split the magnetic flux in the gap into two components. By changing the geometry of the insert, the relationship between these two flux components can be changed, thereby reducing the degree of heating of the web material. This ensures more favorable conditions for welding. However, this method does not completely uniformize the heating temperature of the material, and it is only when the current concentrator has a substantial length that this non-uniformity in heating temperature is significantly reduced, so it is not sufficient. This is not an effective method. Additionally, this method increases the depth of heating of the flange blank, which is also undesirable. The use of passive current concentrators therefore does not allow for the production of high quality welded joints, especially when welding thin-walled parts and parts made of difficult-to-weld materials.

A high-frequency welding process used to weld flange-type stock and web-type stock, in which one end of the picture stock to be welded is bent by bending the flange stock until it contacts the web stock at the point of confluence. Heat the picture material by heating and pressing the picture material by passing a high-frequency current through the contact point to the other end of the side where the picture materials are separated from each other, heating and pressing the picture material, and inducing an electromotive force in the flange material. High-frequency welding methods are known in which the degree of
(see 7).

This method contributes to achieving uniform heating and often results in high quality welded joints. In this method, a so-called "active" current concentrator is used essentially as part of the circuit and is placed in the gap between the web material and the flange material. The entire welding current flows through this active current concentrator, and its effectiveness depends on the length of the current concentrator and on the size of the gap between the current concentrator and the flange blank. In the flat area of the flange material to be welded near the point of confluence with the web material, the current is concentrated due to the opposite direction of the current flowing along the web material, creating a ``fringing effect''. Below the concentrator, the current is concentrated by interaction with the opposite current of the concentrator. However, when this method is implemented, the space formed between the image materials is such that the current concentrator is energized with the entire welding current and advances the current concentrator at maximum speed toward the moving flange material. Therefore, it is possible to increase the gap between the welded materials in the path of bringing them together, i.e. increase the merging angle, and at the same time place the current concentrator at a sufficient distance from the joining point of the materials. It is necessary to place the

This leads to a deterioration in the uniform heating of the picture element and requires the use of additional means to later equilibrate the temperature of the picture element to be welded. In this known method, this temperature equilibrium can be achieved simply by shortening the heating time of the web material, but this necessarily results in a temperature field with a steep gradient from the edge of the metal to its depth. will occur later, and its highest value will be at the edge of the metal. In particular, this is a characteristic of materials with low thermal conductivity and when attempting to ensure efficiency of the welding process at the expense of high welding speeds. In this case, the temperature and deformation conditions set for the web material reduce the quality and processing efficiency of the welded joint, and the penetration at the edge also deteriorates. Moreover, the attempt to reduce the distance between the confluence of the picture material and the contact point supplying the current to the web material introduces significant complications when implementing this welding method for industrial applications. It will be accompanied. This is because it is necessary to provide means for stabilizing the position of the web material in the space formed at the end of the welding zone. Although this known method allows varying the degree of heating of the flange blank, it cannot ensure its stability and therefore cannot weld the blanks to a high quality. This is caused by the gap between the current concentrator and the flange material taking on various values due to the instability of the merging V-shaped angle of the material when the material is moved. This variation in the value of the gap is caused, in this known method, by bending the flange blank with a smooth radius in a constant direction; It is not possible to keep the convergence V-shaped angle of the material constant, and it is naturally necessary to use special guide means to maintain the bent shape of the flange material, and there are It is necessary to stabilize the position by applying force to the side receiving the heat. There are practical drawbacks to such a solution.

This is because the above-mentioned means must be installed in areas subjected to the action of strong electromagnetic fields and high heating temperatures, while the space for accommodating the above-mentioned guide means is limited by the arrangement of the current supply device and the clamping roll. This is because they are subject to restrictions. A high-frequency power supply is provided that electrically engages a current-carrying conductor, and the current-carrying conductor is provided with a contact chip for passing a high-frequency current to the mutually separated ends of the flange and web material on which the tightening roll acts, and the rotation of the roll Devices are known for high-frequency welding of flange material and web material, the axis of which is in a plane perpendicular to the web material, and further comprising a device for inducing an electromotive force in the flange material.
(See U.S. Pat. No. 3,610,869).

The above-mentioned device for inducing an electromotive force in the flange material is made in the form of a current-carrying bus bar and a concentrator. However, this known device does not allow high-quality welded joints to be obtained, especially when used to weld thin-walled parts or parts made of difficult-to-weld materials, and under factory conditions This does not guarantee the stability of the welding process.

The reason for this is that the gap between the bus bar and the flange material is unstable, and a large current load is imposed on the bus bar. The structure of the means for stabilizing the position of the web material in order to place it close to the material became a problem.
Despite difficult operating conditions and high loads, it is necessary to reduce the physical dimensions of each part of this means;
The high temperature gradients at the edges of the web material and the low plasticity of the layers adjacent to the edges of the material result in overloading of the clamping rolls by applying high pressures to the weld zone. The present invention essentially consists of a method for high-frequency welding of flange-type and web-type materials, and an apparatus for carrying out the same, in which a predetermined bending of the flange material allows for the welding of image materials, especially when welding thin-walled materials. A method and apparatus for increasing the stability of the merging V-angle of the web material, equalizing the temperature of the area of the material to be heated for welding, and optimizing the distribution of the temperature field at the edge of the web material. The purpose is to provide.

The purpose of this is to bring together one end of the picture material to be welded together by bending the flange material until it contacts the web material at the point of confluence, and then to the other end of the picture material, which is separated from each other, by applying high frequency In a method of high-frequency welding of flange-type material and web-type material, in which the degree of heating of the image material is varied by applying an electric current, heating and pressing the image material, and inducing an electromotive force in the flange material. According to the present invention, the flange material is bent round in various directions, and at the same time an electromotive force is induced in the flange material, an additional electromotive force is induced in the web material on its side. will be achieved.

By subjecting the flange material to bending in various directions while applying a slight tension along its length, and by maintaining the feeding and ejection of the flange material in one and the same direction after welding, the flange material will bend at the contact point. The bending shape of the flange material can be strictly stabilized from the moment it passes through until the moment it meets the web material.

In this case, it is sufficient to apply normal pressure in the heating region only to the opposite side of the flange blank that is not directly welded. This facilitates implementation of the high frequency heating operation, provides the required distance from the point of contact to the flange blank to the meeting point of the picture blank, and provides the required temperature uniformity. By inducing an electromotive force in the flange material subjected to bending in various directions and at the same time inducing an additional electromotive force on the side of the web material, a portion of the welding current is directed directly from the edge of the web material. It can be shifted to the sides, thereby reducing overheating of the web material and lowering the edge heating gradient. By increasing the length of the edge of the web material to be heated and increasing the heating time of the edge of the web material even though the specific heat capacity of a portion of that length is decreased, only the surface layer of the metal is melted and the web material is melted. The temperature will gradually decrease in the direction from the edge to its depth. Therefore, an optimum temperature gradient and optimum conditions for welding occur. As a result, when pressing the image material, the liquid metal is completely removed from the joint area, and the temperatures required for welding and the adjacent layer of metal with high plasticity are deformed to create a mushroom-shaped thickness at the base of the web material. It is formed. Thus, insufficient penetration of the edges of weld joints and other defects are removed from the thickness of the web stock, which may be removed mechanically if desired. When carrying out the invention, the flange blank can simply be bent appropriately at a constant radius within the welding zone from the joint where the current is supplied to the flange blank to the confluence of the picture elements.

This is because in this way the deformation energy expended in bending is the lowest and this is the easiest technique to implement from a technical point of view. Along with this, it is desirable to ensure that this radius-to-thickness ratio of the flange material is at least 50. In this case, the level of residual weld stress and the residual curvature of the parts after welding are reduced. The method of the invention comprises a high-frequency power supply electrically connected to a current-carrying conductor, said current-carrying conductor having contact tips for passing a high-frequency current to the mutually separated ends of the flange material and web material on which the clamping roll acts. , the rotational axis of the roll is in a plane perpendicular to the web material, and the apparatus is further provided with a device for inducing an electromotive force in the flange material,
The invention further comprises a tension roll configured to have a gap with respect to the tightening roll acting on the flange material, the gap being sufficient to pass the flange material between the rolls, and Furthermore,
A device for inducing an additional electromotive force in the web material is disposed between the clamping roll and a contact tip of a conductor that supplies current to the web material, and the device for inducing an electromotive force in the flange material This is achieved by a device characterized in that it is made in the form of a current-carrying busbar, which is arranged opposite the web material and equidistant to the outer surface of the clamping roll acting on the material. Since the quality and stability of high-frequency heating is mainly based on the constant V-shaped convergence angle of the heated image material, such technical solutions can improve the quality of heating for welding. can be substantially improved.

When the present invention is used, the flange material has the same shape as the tightening roll acting on it, so the convergence angle can always be kept constant. Furthermore, by using devices that induce additional emfs on the sides of the web material, the contacts supplying the current to the web material can be located essentially remote from the clamping rolls, thereby A reliable structure can be devised for the unit that stabilizes the position of the web material and the overall efficiency of the welding equipment can be increased. In addition, high durability and efficiency of this device are ensured by eliminating breakdown caused by the device that induces electromotive force in the flange material.
The device for inducing an electromotive force in the flange material is always arranged so that a gap is maintained with respect to the flange material.
Another feature of the present invention is that the flange blank can be simply bent to an appropriate radius in the welding zone from the point of contact supplying current to the flange blank to the meeting point of the picture blank.

With such a solution, only a minimum amount of deformation energy is required for bending the flange blank, and this is the solution that is easiest to implement from a technical point of view.

Furthermore, the present invention provides a high-frequency welding device in which a device for inducing an additional electromotive force on the web material is made in the form of an electromotive force induction wire, one end of which is connected to a high-frequency power source and the other end is connected to the web material. Connected to a conductor supplying a current, the active surface of this electromotive force-inducing wire is directed towards the side of the web material and is arranged parallel thereto.

Such a technical solution simplifies the structure of the current supply system and improves the operating efficiency when varying the degree of heating of the web material.

Referring to FIG. 1, the method of the present invention for high-frequency current welding of a flange material and a web material will be described below.

Based on the desired geometric dimensions of the resulting piece, two sheet materials of the required width and length are prepared.

In the case of a three-element piece, such as an H-shaped piece, three pieces of material are each prepared. For simplicity of explanation, and taking into account the similarities of the techniques, the present invention will be summarized below for a preferred embodiment of welding a T-shaped or chevron-shaped two-element piece. One of the materials is hereinafter referred to as flange material 1, and the second
The material will be hereinafter referred to as web material 2. The picture materials 1 and 2 are gradually brought together (in the direction of movement along arrows A and ; Ru. In this case, the flange material 1 is first bent round in a certain direction by applying a distributed load Q, acting on the inner surface D of the material 1, and then a distributed load Q acting on the outer surface E of the flange material 1. , is bent in the opposite direction. Next, a high-frequency current supplied from the high-frequency power source 9 is passed through the respective contact portions 7 and 8 to the other ends 5 and 6 of the materials 1 and 2, which are separated from each other (the current path is indicated by a broken line with an arrow). (indicated by 〃). In order to obtain the required bending shape of the flange material 1, the tensions N1 and N, which ensure the desired tensile state, are equal to the loads Q and Q,
is applied to its ends 3 and 5 simultaneously with the application of . What is the concentration of the current flowing along the arrow "a" in the heating region 10 of the flange material 1? In order to increase the heating, the degree of heating can be varied by inducing an electromotive force in the material 1. This electromotive force is induced on the inner surface D of the flange material 1 by a current flowing from the high frequency power source 11 to the vicinity of the heating region 10 (the current path is indicated by a broken line with an arrow b). In this case, arrows 〃a〃 and 〃b〃! The currents flowing along l are in antiphase. At the same time, the current 〃a〃 is applied to the web material 2.
An additional electromotive force is induced on the side surface F of the web material 2 so as to be distributed over the edges of the web material 2. This facilitates removing overheating of the edge 12 and creating an optimal deformation zone there. The additional electromotive force is induced on the side surface F by a current flowing from the high frequency power source 13 near the side surface F in the direction of arrow C. Currents [C] and [a] have opposite phases. Materials 1 and 2 are thus heated to equal welding temperatures. The heated areas are then pressed together at point C with the required force P. Now, if you refer to Figure 2,
A modification of the high-frequency welding method of the present invention is shown, in which the current flowing along the arrow "a" is applied to the flange material 1 via the contact portion 7 from the point 14 to the junction of the image materials 1 and 2. In the welding zone up to C, the flange blank 1 is simply bent with a constant radius RcOnst.

The value of this ratio of radius R to the thickness of flange blank 1 is generally greater than 50. The apparatus shown in FIG. 3 for high-frequency welding of flange blanks and web blanks includes clamping rolls 5 and 4 acting on edges 3 and 4 of picture blanks 1 and 2.
6, the axes of rotation of these rolls are parallel to each other and in a plane perpendicular to the plane of the web material 2.

If T-shaped or chevron-shaped two-element pieces are to be welded, the clamping roll 15 acts directly on the end 3 of the flange blank 1 and the clamping roll 16 acts on the end 4 of the web blank 2. The high-frequency welding device comprises a high-frequency power source 17 electrically connected to replaceable contact tips 7 and 8, which are separated from each other in the flange blank 1 and the web blank 2 on which clamping rolls 15 and 16 act. A high frequency current is sent to ends 5 and 6.

In the device proposed herein, the power source 17
performs the functions of all power supplies 9, 11 and 13. Thereby, the adjustment during operation of these power supplies and the control of the heating of the material is substantially simplified. The power source 17 is electrically connected to the contact chips 7 and 8 via fixed current-carrying conductors 18 and 19 and movable current-carrying conductors 22 and 23;
and 23 are fixed current-carrying conductors 1 via pins 20 and 21.
8 and 19 respectively and terminate in replaceable contact tips 7 and 8, respectively. The fixed current-carrying conductor 18 is configured to pass a high frequency current to the flange material 1 and is connected to the power source 17 via a bus bar 24. Furthermore, this high-frequency welding device is equipped with a device that induces an electromotive force in the flange material 1.

According to the invention, a tension roll 25 (FIG. 3) is fixed to the side of the tightening roll 15. The tension roll 25 and the tightening roll 15 are installed so as to have a gap d sufficient to pass the flange material 1 between them. In order to weld three-element pieces such as a double T-shape or a channel-shape, a second tension roll installed on the side of the tightening roll 16 and configured similarly to the tension roll 25 is provided in this device. It will be done.

In this case, the tightening roll 16 also acts on the second flange material. For simplicity of illustration, FIG. 3 shows an embodiment of the apparatus used to weld two-element pieces. A roll 26 that stabilizes the position of the web material 2 is mounted between the clamping rolls ]5 and ]6.

The clamping rolls 5 and 16 and the position stabilizing roll 26 are provided with a mechanism for adjusting the distance between them, which allows this distance to be varied based on the size of the material. The design of the device also contemplates a mechanism for varying the relative positioning of the stabilizing rolls 26 laterally with respect to the clamping rolls 15 and 16. The high-frequency welding device according to the invention is provided with a device for inducing an additional electromotive force in the web material 2, and this device connects the contact tip 8 of the current-carrying conductor 23 that supplies current to the web material 2, the clamping roll 15 and 16, the side surface F of the web material 2
placed along the

This device is actually a water-cooled electromotive force induction line 27.
The end G of this electromotive force-inducing wire 27 adjacent to the clamping rolls 15 and 16 is directly connected to a high-frequency power source 17, and the other end H is connected to a fixed current-carrying conductor 19 that supplies current to the web material 2. . The electromotive force-inducing wire 27 is mounted so that its acting surface J (FIG. 4) faces the side surface F of the web material 2, extends parallel to the side surface, and is spaced a certain distance e from the side surface. Ru. An energizing bus bar 28 serving as a device for inducing an electromotive force in the flange material 1 is fixed between the bus bar 24 and the tightening roll 15.

This bus bar 28 is installed equidistantly from the outer surface of the tightening roll 5 so as to have the required gap f (FIG. 5). The working surface K of the bus bar 1 28 is the web material 2
edge] 2. In addition, the high-frequency welding device includes a power element for pressing the image material during the welding process, a system for applying and taking in cooling liquid, a system for lubricating friction parts, and other components required for the functioning of the device. means, but these are not shown.

The apparatus of the present invention for high frequency welding of materials operates as follows.

Materials 1 and 2 to be welded are sent to the device.

The web material 2 is passed under the contact tip 8 and the electromotive force induction wire 27 and introduced between the position stabilizing rolls 26. An adjustment mechanism brings these position stabilizing rolls 26 together until they come into contact with the web material 2. The flange blank 1 is placed on the tension roll 25, bent around the roll, and passed into the gap d between the tension roll 25 and the tightening roll 15. Further, the contact tip 7 is pushed out, and the flange material 1 is bent in the opposite direction while the contact tip 7 is pushed out.
and passes under the bus bar 18. Next, flange material 1
continues to be fed, and the flange material 1 is bent against the tightening roll 15 so as to gradually surround this roll, and is further fed so that the front end 3 of the flange material 1 is in contact with the web material 2. . Thereafter, the picture materials are fed together in their feeding direction so that their ends pass over the clamping rolls 15 and ]6. In order to ensure a high-quality bonding of the picture materials during subsequent heating, the required tension is applied to these materials and the required welding force is applied to the clamping rolls 15 and 16. The material feed mechanism and high frequency power source 17 are switched on. At a certain period of time, a current flowing from the high-frequency power source 17 (FIG. 3) through the bus bar 24 and the current-carrying conductors 18, 20 along the arrow "a" (FIG. 1) is applied to the flange material by the contact chip 7. given to side D of 1. The current flowing from there along the arrow a is the current flowing to the bus bar 28 (arrow b
It depends on the interaction with (denoted by ).

In the bus bar 28 (for example, made in the form of a short-circuit winding that is inductively coupled to the current flowing along the arrow "a"), which constitutes a device that induces an electromotive force on the surface of the flange material 1, the arrow "b" The current flowing along the arrow "a" is in opposite phase to the current flowing along the arrow "a". Due to the "fringing effect" of the currents flowing in opposite directions along the arrows "a" and "b", the currents flowing along the arrows "a" are concentrated in the narrow heating area 10 on the surface D of the flange material 1. Ru. This surface D
The position of the upper heating area 10 is determined by the position of the bus bar 28 relative to the flange blank 1. Since the bus bar 28 is placed exactly opposite the edge 12 of the web material 2, the position of the concentrated heating area 10 on the surface D corresponds exactly to the next welding zone of the edge 12 of the web material 2.
The current flowing through the flange material 1 along the arrow "a" flows to a point C where the picture materials 1 and 2 are in contact, and then to the web material 2. The nature of the current flowing through the web material 2 along arrow "a" is determined by a number of factors. In the section from point C to the area of action of the electromotive force induction line 27,
The factors that determine the properties of the current are the "edging effect" caused by the reverse current flowing through the flange material 1 along the arrow "a" and the "skin effect" of the high frequency current flowing from the high frequency power source 17. In this section, a strong heating of the edges 12 of the web material 2 occurs. In the area of action of the device for inducing an additional electromotive force on the side surface of the web material 2, i.e. the electromotive force induction line 27, the nature of the current flowing along the arrow "a" is similar to that of the current flowing along the arrow "C". It is determined by the interaction with the current flowing through the electromotive force induction line 27. Since these currents 〃a〃 and 〃C》 are in opposite phase, their interaction causes a part of the current flowing in the web material 2 along the arrow 〃a〉 to be transferred from the edge 12 of the web material 2 to its side surface F.
will be moved to. Next, the current flowing along the arrow "a" passes through the contact chip 8, through the movable current-carrying conductor 23 and the fixed current-carrying conductor 19, which are pivotally connected to each other by a pin 21, and through the electromotive force induction line 27 to the arrow "C". 〃 direction, and then flows to the high frequency power source 17. The above-described flow and distribution of the welding current along the arrow "a" occurs continuously whenever the materials 1 and 2 approach the confluence point C, so that the materials are welded at the temperature conditions required to obtain a high quality joint. Make it possible to advance to the point. A force P transmitted by a power element of the device (for example a hydraulic cylinder) to the clamping rolls 15 and 16 presses the picture elements 1 and 2 to form a welded joint. When the heated materials 1 and 2 are pressed, the position stabilizing roll 26 always supports the web material 2 so that the longitudinal stability of the web material 2 is not lost. The blanks 1 and 2, joined by the welded seam, emerge from the device in one piece in the form of a flange web, which is then sent for further processing. Compared to known methods and devices, the stability and quality of high-frequency welding, especially of thin-walled, small-sized parts and parts made of difficult-to-weld materials, can be substantially improved using the present invention. can.

In addition, the maintenance of the device is simplified and the reliability of its operation is increased.

[Brief explanation of the drawing]

FIG. 1 shows the method of the present invention for high-frequency welding a flange-type material and a web-type material, in which one end of the picture material to be welded is brought together by bending the flange material until the flange material contacts the web material. FIG. 2 is a schematic diagram showing the operation of supplying a high-frequency current to the other end of the picture material through the contact portion, FIG. A vertical cross-sectional view of the apparatus according to the present invention for high-frequency welding a flange material and a web material, FIG. 4 is a cross-sectional view taken along the line IV-1V in FIG. 3,
FIG. 5 is a sectional view taken along the line V--V in FIG. 3. 1...Flange material, 2...Web material, C...
・Confluence point of image materials, 8...Contact chip, F...Side surface of material, 15, 16...Tightening roll,] 7.
... Power source, 19, 23... Current-carrying conductor, 25... Tension roll, d... Gap, 27... Electromotive force induced line, J... Action surface of electromotive force induced line, 28... ... Current-carrying bus bar, G, H ... End of electromotive force induced wire.

Claims (1)

[Claims] 1. Bring one end of both materials together by bending the flange material until it contacts the web material at the confluence point, and then bring the two materials together at the other end where they are separated from each other at the contact point. A method of high-frequency welding the flange material and web material, in which a high-frequency current is passed through the flange material to heat and press both materials, and the degree of heating of both materials is varied by inducing an electromotive force in the flange material. A method characterized in that the flange material 1 is bent round in various ways, and at the same time as an electromotive force is induced in the flange material 1, an additional electromotive force is induced in the web material 2 on its side face F. . 2. According to claim 1, the flange material 1 is simply bent at a constant radius R in the welding zone from the contact part that supplies current to the flange material 1 to the confluence C of the two materials 1 and 2. the method of. 3. A high-frequency power source electrically connected to the current-carrying conductor is provided, and the current-carrying conductor is provided with a contact chip that causes a high-frequency current to flow to the mutually separated ends of the flange material and the web material on which the tightening roll acts, In an apparatus for high-frequency welding a flange material and a web material, the axis of rotation of the roll is in a plane perpendicular to the web material, and the flange material a tension roll 25 installed with a gap d relative to the tightening roll 15 acting on the tension roll 15, the gap being sufficient to allow the flange material 1 to pass between these rolls 15 and 25; Further, a device for inducing an additional electromotive force in the web material 2 is connected to the tightening roll 15.
and 16, and a conductor 2 for supplying current to the web material 2.
3 and the device for inducing an electromotive force in the flange material 1 is located equidistant from the outer surface of the tightening roll 15 acting on the flange material 1 and facing the web material 2. A device characterized in that it is made in the form of an energized busbar 28 arranged. 4 The above device for inducing an additional emf in the web material 2 is essentially an emf inducing wire 27, one end G of which is connected to the high frequency power source 17 and the other end H of which is connected to the web material 2.
according to claim 3, in which the active surface J of the electromotive force-inducing wire 27 is directed towards the side surface F of the web material 2 and is arranged parallel thereto. equipment.