JP3098024U - Induction heating hybrid arc welding equipment - Google Patents

Abstract

To provide an induction heating hybrid arc welding apparatus capable of improving productivity and reducing equipment cost and production cost.
A high-frequency induction heating coil is wound several turns, and comprises a combination of an induction heating device having a ferrite core in the center of the high-frequency induction heating coil and an arc welding device. Further, in the induction heating hybrid arc welding apparatus, when there is a groove in the metal joint to be induced, the ferrite core is in the groove. Further, in the induction heating hybrid arc welding apparatus, the temperature of the metal joint by the induction heating is 100 ° C. to 200 ° C. Further, in the induction heating hybrid arc welding apparatus, the distance between the terminal end of the high frequency induction ferrite cored coil and the arc generating point is 50 mm to 150 mm.
[Selection] Fig. 6b

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to an induction heating hybrid arc welding apparatus for pipes of various metallic materials and large structures by a combination of induction heating and arc welding (TIG welding, MIG / MAG welding, submerged arc welding).
[0002]
[Prior art]
Conventional arc welding is a single-electrode electrode or multi-electrode arc welding in which two to four electrodes are arranged in a series, in which the metal to be joined is melted using arc heat and the welding wire is also melted and joined. .
As an induction heating method combining different heat sources, there is a method combining a laser heat source with MIG and MAG welding.
[0003]
In addition, a prior art (Japanese Patent Laid-Open Publication No. H10-163,1992) comprising an induction heating coil having a constant length having substantially the same cross-sectional shape as the groove of the welding portion, and a welding device main body disposed behind the induction heating coil in the welding direction. No. 7-40051).
[0004]
[Problems to be solved by the invention]
In the prior art, when performing automatic welding only by arc welding, it is necessary to simultaneously melt the wire while melting the metal surface in the groove by arc heat, and naturally according to the thermal conductivity of the metal. At the same time, heat is diffused and the loss due to thermal diffusion from the arc column is large, so that not all of the applied power energy is used for welding. In the case of hybrid arc welding, it is expensive. (5 to 20 times as compared)), it is difficult to apply to thick plate welding that requires groove processing, that is, it is extremely difficult to heat the inside of the groove because the groove is processed at the joint. In the case of the prior art (for example, Japanese Patent Laid-Open Publication No. 7-40051), the method can be applied to a wide groove based on a V-groove, but cannot be applied to a narrow groove. , Again Core is not used, and there the problem that the efficiency is poor in is the magnetic flux intensity and heating effects a coil of one turn.
[0005]
Accordingly, an object of the present invention is to provide an induction heating hybrid arc welding apparatus that can increase productivity and reduce equipment costs and production costs.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the induction heating hybrid arc welding apparatus of the present invention has an induction heating apparatus in which a high-frequency induction heating coil is wound several turns, and a ferrite core is provided at the center of the high-frequency induction heating coil. It consists of a combination with an arc welding device.
Further, in the induction heating hybrid arc welding apparatus, when there is a groove in the metal joint to be induced, the ferrite core is in the groove.
Further, in the induction heating hybrid arc welding apparatus, it is preferable that the temperature of the metal joint by the induction heating is 100 ° C to 200 ° C.
In the induction heating hybrid arc welding apparatus, it is preferable that the distance between the terminal end of the high-frequency induction ferrite cored coil and the arc generating point is 50 mm to 150 mm.
[0007]
[Embodiment of the invention]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1a shows a conventional TIG welding apparatus, in which a welding power source 3, a shield nozzle 1, an electrode (tungsten electrode) 2, a weld metal 4, and the like are shown.
FIG. 1b is a diagram showing a conventional MIG / MAG welding apparatus, showing a welding power source 3, a shield nozzle 1, an electrode (wire) 2, a weld metal 4, a contact tip 5, a wire feed roller 6, a droplet 7, and the like. Have been.
As shown in FIGS. 1A and 1B, general arc automatic welding (TIG, MIG / MAG welding) uses an arc heat to melt a metal to be joined, and also fuses and joins a welding wire.
[0008]
FIG. 2 is a view showing a conventional induction heating apparatus, in which a high-frequency power supply 8 and a high-frequency water-cooling coil 9 are arranged on a heating metal 21 (carbon steel rod), and an eddy current 10 due to a skin effect is shown. .
As shown in FIG. 2, in the conventional induction heating method, a high-frequency water-cooling coil for generating a high-frequency magnetic flux is arranged around a metal, and rapid heating is performed by inducing an eddy current by a skin effect on the metal surface. It is used for hot forging, induction hardening, induction brazing, shrink fitting, and the like.
[0009]
However, in the case of the conventional arc welding and induction heating methods, there are the above-mentioned problems. Therefore, the present invention solves the problems by applying high-frequency induction heating to the weld metal 4 as shown in FIGS. 3A and 3B. It has been devised that the coil 11 is wound several turns and a ferrite core 12 is provided at the center of the high-frequency induction heating coil 11.
[0010]
FIG. 3A is a view showing the induction heating apparatus of the present invention in a case where the groove 15 is shallow, in which the weld metal 4 has the groove 15 and the ferrite core 12 is inserted into the groove 15 and the ferrite core 12 is inserted. Shows a state in which the high-frequency induction heating coil 11 is wound several turns. The high-frequency induction heating coil 11 has a water-cooled copper tube 14 wound with an insulating material 13.
[0011]
FIG. 3b is a view showing the induction heating apparatus of the present invention when the groove 15 is narrow and deep. The weld metal 4 has the groove 15, the ferrite core 12 is inserted into the groove 15, and the ferrite core is inserted. Since the high frequency induction heating coil 11 is wound several turns around the groove 12 and the groove 15 is narrow and deep, the length of the ferrite core 12 is larger than in the case where the core is shallow.
Although not shown in FIG. 3a, water-incoming and outgoing water-cooled copper tubes 16, 17 and a high frequency power supply 18 are shown.
[0012]
Normally, the magnetic flux flows through the ferrite core 12 more easily than the metal, so that the magnetic flux concentrates and passes through the ferrite core 12, passes through the metal in the groove 2, and can form a magnetic flux closed circuit. A heating section by eddy current can be secured on the surface. Also, since the coil is wound several turns, the efficiency is extremely high in the magnetic flux intensity, heat generation effect, and the like.
[0013]
4a and 4b show a state where the thermocouple is attached to the weld metal 4 at points A, B and C. FIG. 4a is a view from the front, and FIG. 4b is a view from the side.
Arrows indicate the direction of travel.
[0014]
FIG. 5 is a diagram showing the result of measuring the temperature change by heating the surface of the weld metal 4 at three points A, B, and C shown in FIG. 4 by changing the moving speed by the induction heating device of the present invention. As can be seen from FIG. 5, when the temperature of the inner bottom of the groove, the back surface of the weld metal and the surface of the weld metal is relatively slow as 100 mm / min, the difference is as high as 110 ° C. but as high as 900 mm / min. The difference in the movement is as low as 10 ° C., indicating that the inside of the groove is sufficiently heated. Therefore, when the high-frequency induction heating coil 11 with the ferrite core 12 developed in the present invention is arranged in front of the arc welding torch and the arc welding is performed while heating the inner surface of the groove, productivity can be greatly improved. You can do it.
[0015]
FIG. 6A is a front view of the induction heating device of the present invention, and the thermocouple mounting position is indicated by a point E.
FIG. 6b is a side view showing the combination with the induction heating device arc welding device (TIG welding) of the present invention, in which the shield nozzle 1, the electrode 2, the wire 19 and the wire guide 20 are shown and the arc welding machine and the front. Shows a state in which the high-frequency induction heating coil 11 with the ferrite core 12 disposed in the direction shown in FIG. Since the high frequency induction heating coil 11 with the ferrite core 12 performs the arc welding while heating the inner surface of the groove, very efficient welding can be performed. The thermocouple mounting position is indicated by point E.
[0016]
FIG. 7 shows an induction heating hybrid arc welding apparatus of the present invention, a temperature measurement method using conventional arc welding, and the results.
The temperature measurement curve of curve D is a measurement result in the case of only arc welding.
It takes 6 seconds to reach the maximum temperature from room temperature 20 ° C. (Δt).
Curve E (measured at the thermocouple mounting position E point in FIGS. 6a and 6b) shows the case of induction heating and arc welding, and the time to reach the maximum temperature (Δt) is 5 seconds, which is reduced by 1 second. I have.
The preheating temperature in this case is 180 ° C.
In this case, the maximum temperature is also 680 ° C., which is 150 ° C. higher than the case of only arc welding (530 ° C.), indicating that the potential energy is large.
In TIG welding, the welding energy of arc welding is set to 410AX11.5V = 4175Joul, and when the welding speed and the wire feed rate are increased, the welding speed is 450 mm / min, and the wire feed rate is 4200 mm / min, and the productivity is increased by 40% or more. succeeded in.
At this time, the arrangement space between the end portion of the induction heating coil and the arc point is 150 mm.
Depending on the type of the arc welding method, it is considered that this distance is appropriately 50 to 150 mm.
Since the heating temperature of the metal by induction heating varies depending on the type of metal, 100 ° C. to 200 ° C. is considered to be an appropriate temperature.
[0017]
When the groove 15 is not provided, a high frequency induction heating coil 11 is wound around the weld metal 4 for several turns, and the ferrite core 12 is arranged at the center of the coil 11 on the same surface as the lower part of the coil. The effect is obtained.
[0018]
[Effect of the invention]
Since the present invention requires the above configuration, especially in the case of having a groove, the induction heating hybrid arc welding apparatus of the present invention is extremely high because the induction heating device works together with the arc welding while efficiently heating the inside of the metal joint groove. Productivity can be secured.
[Brief description of the drawings]
FIG. 1a is a view showing a conventional TIG welding apparatus.
FIG. 1b is a view showing a conventional MIG / MAG welding apparatus.
FIG. 2 is a diagram showing a conventional induction heating device.
FIG. 3a shows the induction heating device of the present invention when the groove is shallow.
FIG. 3b shows the induction heating device of the present invention when the groove is deep.
FIG. 4a is a view showing a state where thermocouples of weld metal are attached at points A, B and C as viewed from the front.
FIG. 4b is a view showing a state where thermocouples of weld metal are attached at points A, B and C as viewed from the side.
FIG. 5 is a diagram showing the results of measuring temperature changes at three points A, B, and C.
FIG. 6a is a front view of the induction heating device of the present invention.
FIG. 6b is a side view of the combination of the induction heating device and the arc welding device of the present invention.
FIG. 7 is a diagram showing a temperature measurement method using the induction heating hybrid arc welding apparatus of the present invention and a conventional arc welding apparatus and the results thereof.
[Explanation of symbols]
Reference Signs List 1 shield nozzle 2 electrode 3 welding power supply 4 welding metal 5 contact tip 6 wire feeding roller 7 droplet 8 high frequency power supply 9 high frequency water cooling coil 10 eddy current 11 high frequency induction heating coil 12 ferrite core 13 insulating material 14 water cooling copper tube 15 open Tip 16 Water-cooled copper tube in which water enters 17 16 Water-cooled copper tube in which water exits 18 High-frequency power supply 19 Wire 20 Wire guide 21 Heated metal

Claims (4)

Induction heating hybrid arc welding comprising a high frequency induction heating coil wound several turns and a combination of an induction heating device and an arc welding device provided with a ferrite core in the center of the high frequency induction heating coil. apparatus. 2. The induction heating hybrid arc welding apparatus according to claim 1, wherein the ferrite core is located in the groove when the metal joint to be welded has a groove. The induction heating hybrid arc welding apparatus according to claim 1, wherein a temperature of a metal joint portion by the induction heating is 100 ° C. to 200 ° C. in the induction heating hybrid arc welding apparatus. 3. The induction heating hybrid arc welding apparatus according to claim 2, wherein the distance between the terminal end of the coil with a high frequency induction ferrite core and the arc generating point is 50 mm to 150 mm.

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