JPH02200377A - Coupling coil in common use as dc reactor - Google Patents

Abstract

PURPOSE:To obtain a small and light welding power source by winding primary windings and secondary windings for superposing high-frequency voltages on a core formed by combining a 1st core consisting of a material which does not degrade the magnetic permeability up to a frequency region above a specific frequency and a 2nd core consisting of a material which maintains the high magnetic permeability up to about the specific frequency. CONSTITUTION:The primary windings 12 which superpose the high-frequency voltages and the secondary windings 14 are provided via an insulating material 14 on the 1st core 11 (ferrite) formed by using the material which does not degrade the magnetic permeability up to the frequency region above 20MHz and the 2nd core 9 (silicon steel sheet) formed by using the material which maintains the high magnetic permeability up to about 0.1MHz. This coupling coil in common use as a DC reactor operates as a coupling coil with the 1st core 11 as its core at the time of a welding arc start and operates as the DC reactor with the 2nd coil 9 as its core after the start of the welding arc. The high-frequency voltage by the coil 15 is guided between a torch 6 and base metals by a cleaning unit 5.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is directed to a DC reactor for smoothing a welding current used in a non-consumable electrode type gas-shielded arc welding power source, and for non-contact arc starting to the main circuit through which the welding current flows. This relates to a coupling coil that superimposes a high frequency voltage.

2. Description of the Related Art The secondary circuit of a conventional non-consumable electrode type gas-shielded arc welding power source is shown in FIG.

The secondary output of the welding transformer 1 is rectified by a rectifying diode 2 and then smoothed by a DC reactor 3. The smoothed output current is applied as a welding arc 7 between the torch 6 and the base metal 8 by a high frequency voltage generated by the coupling coil 4. Here, the high frequency voltage generated by the coupling coil 4 is induced between the torch 6 and the base material 8 by the cleaning unit 6. Next, FIG. 4 shows the configuration of a conventional DC reactor. It has a structure in which an insulating material 1o is wound on the second core 9, and a coil 11 through which welding current flows is wound thereon. The second core 9 of this DC reactor exhibits magnetic permeability characteristics as shown in No. 60, approximately 0.
It maintains a high magnetic permeability μB up to about 1 Mjlz, and has the ability to sufficiently smooth the rectified current up to 0, I Mllz smoothed by the rectifying diode 2. Next, the configuration of a conventional coupling coil is shown in FIG. A primary winding 12 is wound on the first core 11. Then, an insulating material 13 is wound over the primary winding 12. Then, the secondary winding 14 is wound on the insulating material 13. Primary winding 1 of this coupling coil
The turns ratio n2/ of the number of turns n1 of #2 and the number of turns 02 of secondary winding #14
n1 is usually selected to be 2-4.

Here, the magnetic permeability characteristics of the first core 11 are as shown in FIG.
, the voltage is a high frequency voltage of AC aooov, and the above-mentioned turns ratio n
It has the ability to induce a voltage close to 2/nl in the secondary winding. Here, the magnetic permeability μm of the first core 11 is about the same as the magnetic permeability μ8 of the second core 9.

Problems to be Solved by the Invention In the configuration of such a conventional welding power source, there is a DC reactor 3 for smoothing the welding current, and a coupling coil 4 for high voltage superimposition, which requires a large insulation distance from the case. and had to be housed in two power supplies. Therefore, in order to design the case of the welding power source to be small and lightweight, storing the two aforementioned parts has been a major obstacle.

Means for Solving the Problems In order to solve the above problems, the present invention provides a non-consumable electrode type gas shielded arc welding machine that generates an arc between a non-consumable electrode and a weld base material to weld the weld base materials. used for
A first core using a material whose magnetic permeability does not decrease up to a frequency range of 20 MH2 or more.

A primary winding for high-frequency voltage superimposition is wound around a second core made of a material that maintains high magnetic permeability up to about 0.1 MH2, which is a combination of two types of cores, and an insulating material is placed over the primary winding. It is characterized by having a secondary winding through which welding current flows.

Effects The present invention has the above-described configuration in which the first core used for the coupling coil and the second core used for the DC reactor are combined, so that it is possible to have two core characteristics. That is, the coupling coil for superimposing a high-frequency voltage on the main circuit and the DC reactor for smoothing the welding current can be realized as one coupling coil that also serves as a DC reactor.

Embodiment FIG. 1 is a configuration diagram showing an embodiment of a coupling coil that also serves as a DC reactor of the present invention, and FIG. 2 shows an embodiment of a welding power source using the coupling coil that also serves as a DC reactor of the present invention. It is a block diagram. Hereinafter, the present invention will be explained in detail using FIGS. 1 and 2.

In FIG. 1, 11 is a first core (for example, a ferrite core) having magnetic permeability characteristics with respect to frequency as shown in FIG. 7, and 9 is a second core having magnetic permeability characteristics with respect to frequency as shown in FIG. core (for example, silicon steel plate), 12 is a primary winding for superimposing high-frequency voltage, 13 is primary winding 1
This is an insulating material that maintains insulation between the winding 2 and the secondary winding m14. This coupling coil that also serves as a DC reactor operates as a conventional coupling coil with the first core 11 as the core when the welding arc is started, and operates as a conventional DC reactor with the second core S as the core after the welding arc is started. do.

That is, by combining the first core 11 and the second core 9, a DC reactor/coupling coil having the functions of a DC reactor and a coupling coil is configured.

In FIG. 2, the secondary output of the welding transformer 1 is rectified by a rectifier diode 2 and then smoothed by a coupling coil 16 that also serves as a DC reactor.

The smoothed output current is applied as a welding arc between the torch 8 and the base material 8 by a high frequency voltage generated by the same coupling coil 16 which also serves as a DC reactor. Here, the high frequency voltage generated by the coupling coil 15 which also serves as a DC reactor is induced between the torch 6 and the base material 8 by the cleaning unit 5.

Effects of the Invention As described above, according to the present invention, by combining core materials having two different characteristics, a DC reactor and a coupling coil having two different functions can be combined into one.
This makes it possible to provide a welding power source that is extremely small, lightweight, and low cost compared to conventional welding power sources.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a coupling coil that also serves as a DC reactor, showing an embodiment of the present invention, Fig. 2 is a block diagram of a welding power source using the coupling coil that also serves as a DC reactor, and Fig. 3 is a conventional welding power source. A block diagram of a welding power source, Figure 4 is a perspective view of a conventional DC reactor, Figure 6 is a characteristic diagram of magnetic permeability versus frequency of the core material (second core) used in the DC reactor, and Figure 6 is a diagram of a conventional cup. FIG. 7, which is a perspective view of the ring coil, is a characteristic diagram of magnetic permeability versus frequency of the core material (first core) used in the coupling coil. 1... Welding transformer, 2... Rectifier diode, 3... DC reactor, 4...
・Coupling coil, 6...Cleaning unit, 6...)-chi, 7...Welding arc, 8...Base metal, 9... ...Core B, 1
0... Insulating material, 11... Coil, 12
...Primary winding, 13...Insulation material, 14
...Secondary winding, 16...Coupling coil that also serves as DC reactor. Name of agent: Patent attorney Shigetaka Awano and 1 other person q-
--Core B summary diagram

Claims (1)

[Claims] Used in non-consumable electrode type gas shielded arc welding machines that generate an arc between a non-consumable electrode and the welding base material to weld the welding base metal, and is a material whose magnetic permeability does not decrease up to a frequency range of 20MHz or higher. The first core used and 0.1MHz
A primary winding for high-frequency voltage superimposition is wound around the second core, which is a combination of two types of cores made of a material that maintains high magnetic permeability to a certain extent, and a welding current is applied to the primary winding via an insulating material. A coupling coil that doubles as a DC reactor and is characterized by being wound with a secondary winding that allows current to flow.