KR101433368B1 - Welding Apparatus Having Multi Weld-Processing and Function - Google Patents

Abstract

The present invention enables the welding torch for TIG welding and the welding torch for MIG welding to be supplied with power and welding gas through a single power supply facility and gas supply facility so that the integration of TIG welding function and MIG welding function A welding device with multiple welding techniques is provided.
To this end, the present invention relates to a welding power supply device for supplying a DC power supply current / voltage necessary for arc welding and compensating a current / voltage value by measuring and calculating a drop in output voltage value according to progress of arc welding, The DC supply current / voltage is selectively supplied by switching the gas supply unit for supplying the carbon dioxide (CO2) gas and the argon (Ar) gas to the selective switching unit, the switching function for selectively switching the MIG welding function or the TIG welding function, A selective switching unit for selectively supplying carbon dioxide gas or argon gas to the MIG welding torch according to the MIG welding function, and the voltage of the (+) polarity applied through the selective switching of the selective switching unit is referred to as MIG A wire feeding device to be applied to the welding torch, and a selection switch according to the TIG welding function Receiving the DC power-supply voltage via the select switch is converted to a high voltage for arc welding and for TIG characterized in that it comprises an ignition device to be applied to the preform for a TIG welding torch, and TIG welding.

Description

{Welding Apparatus Having Multiple Weld-Processing and Function}

The present invention relates to a welding apparatus having multiple welding techniques, and more particularly, to a welding apparatus equipped with a multi-welding technique for integrally combining a power supply system and a gas supply system for TIG welding and MIG welding, ≪ / RTI >

Generally, the arc welding system is composed of a welding power source and a wire feeding device. At one side of the wire feeding device, a welding torch for performing an actual welding operation is provided. The welding power source is connected to a welding torch And the like.

Such an arc welding system is classified into a TIG welding method and a MIG welding method. When arc welding is performed on a base material to be welded, first, the TIG arc welding method After the preliminary welding has been completed, the welding torch for TIG arc welding is used to carry out preliminary welding for the welding base material, and a separate welding torch for MIG welding using carbon dioxide (CO2) So that the chaebol welding is proceeding.

In this arc welding system, arc is generated by DC power supply voltage. Negative polarity voltage is applied to the welding torch of the welding apparatus to which the TIG arc welding method is applied, and (+) polarity voltage is applied to the welding base material (+) Polarity is applied to the welding torch of the welding apparatus to which the MIG arc welding system is applied, and a voltage of (-) polarity is applied to the welding base material.

Therefore, although it is necessary to perform rough welding according to the TIG welding method and chivalrous welding according to the MIG welding method for a single welding base material, in order to completely proceed the welding, a welding apparatus of TIG welding type and a welding of MIG welding type Equipment shall be provided separately.

Related technology is disclosed in Korean Laid-Open Patent Application No. 2012-0075294 (arc welding apparatus and circumferential welding method using the same) (July 06, 2012).

However, in the conventional arc welding system, since the polarities of the voltages applied to the welding torch and the welding base material are opposite to each other in a situation where the TIG welding method and the MIG welding method are applied to a single welding base material in a redundant manner, The welding apparatus for TIG welding and the welding apparatus for MIG welding must be provided so that the welding space due to the redundant arrangement of the welding apparatus is inevitably limited and a problem of additional cost burden .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a welding torch for TIG welding and a welding torch for MIG welding to be supplied with power and welding gas through a single power supply system and a gas supply system So that it is possible to integrate the TIG welding function and the MIG welding function.

Another object of the present invention is to provide a welding power supply system of an arc welding system which minimizes the switching loss due to switching of the inverter and can prevent the output of a large current according to the size of the welding load, And to provide a welding apparatus equipped with a multi-welding technique capable of improving the efficiency.

It is a further object of the present invention to measure the current and voltage changes in a short leakage current during an arc welding time generated in a welding torch during a welding operation in an arc welding system and automatically compensate the current and voltage according to the measured value To provide a welding apparatus with multiple welding techniques.

A welding apparatus equipped with a multiple welding technique according to one aspect of the present invention supplies a DC power supply current and voltage necessary for arc welding and measures and calculates a drop in the output voltage value as the arc welding progresses, (CO2) gas for arc welding and a gas supply for supplying argon (Ar) gas to the selective switching unit respectively, switching for selective switching to MIG welding function or TIG welding function The DC power supply current and voltage are selectively supplied to the MIG welding torch and MIG welding base material or the TIG welding base material and the TIG welding torch so that carbon dioxide gas or argon gas is selectively supplied to the MIG welding torch or TIG welding torch A MIG welding torch for supplying a wire to the MIG welding torch, A wire feeding and feeding device for applying a voltage of positive polarity to the MIG welding torch applied through selection switching of the selection switching unit and a selection switch of the selection switching unit according to the TIG welding function, And an ignition device for converting the high voltage to a high voltage for generating arc for TIG welding and applying the high voltage to the TIG welding torch and the base material for TIG welding.

According to the present invention, the selection switching unit may be arranged such that a DC voltage of positive polarity is applied to the MIG welding torch and a DC voltage of negative polarity is applied to the MIG welding base material, according to selection switching for the MIG welding function. (-) polarity DC voltage is applied to the TIG welding torch and a DC voltage of negative polarity is applied to the TIG welding base material according to the selective switching for the TIG welding function.

The welding power source device may further include a power conversion and supply unit for converting the AC power source to a DC power source and adjusting the voltage to a voltage required for arc welding to apply the DC power source current and voltage to the selection switching unit, And a TIG welding torch for measuring a welding current and an output voltage of the welding torch, wherein the welding current and the output voltage are changed in accordance with the progress of the arc welding operation, A welding power source controller for calculating a voltage value of a welding arc based on a variation value of a current and an output voltage and performing a compensation control for compensating a welding current and an output voltage value according to a voltage value of the welding arc; So that the output current and voltage of the power conversion and supply unit are compensated and outputted. Which it is characterized in that it includes a power backup.

The power measuring unit measures variation values of a welding current and an output voltage during a short earth leakage period caused by the start of arc welding by the welding torch.

In the present invention, the welding power control module repeatedly receives the welding current and the output voltage measured for each progressing time of arc welding from the power measuring module, and calculates an average value of the welding current and the output voltage .

The power conversion and supply unit includes a first half bridge inverter that is connected in parallel between both ends of a power input terminal to perform switching for voltage conversion and a second half bridge inverter that is connected to the power input terminal at a rear end of the first half bridge inverter, A second half bridge inverter connected in parallel between the two ends to perform switching for voltage conversion, a second half bridge inverter connected in parallel between the first half bridge inverter and the second half bridge inverter for blocking, ) Connected to an output terminal of the power blocking circuit and a connection center point of each primary coil, and a first and a second power source connected in correspondence with respective output terminals of the first and second half bridge inverters, A rectifier circuit connected to a secondary coil of the first and second power supply transformers to rectify an alternating voltage, And a power reactor having one end connected to the output terminal and the other end connected to the power output terminal to generate a reactance against the current change in the DC output voltage.

The power blocking circuit may be configured such that two first and second blocking capacitors are connected in series with each other and a series connection point of the first and second blocking capacitors is connected between each first- And is connected to the coil connection center point.

In the present invention, an auxiliary inductor (hereinafter, referred to as " auxiliary voltage transformer ") is provided between the first half bridge inverter and the connection node between the first half bridge inverter and the first power voltage transformer so that the first half bridge inverter can secure a zero voltage transition Are connected to each other.

In the present invention, a balanced capacitor is connected between the second half-bridge inverter and the connection end of the second power transformer to compensate for the dynamic constant factor increase of the magnetizing current for the primary coil of the first and second power transformers .

In the present invention, the rectifying elements of the rectifying circuit are soft-switched between the secondary coil side of the first and second power supply transformers and the power reactor, and the first and second half bridge inverters A buffer inductor is connected which reduces the level of the impact loss to the switching element of the inverter.

The present invention further includes a remote controller for remotely operating the welding operation of the MIG welding torch or the TIG welding torch by selective switching through the selection switching unit using CAN communication.

According to the present invention as described above, in the arc welding system, the TIG welding function and the MIG welding function are switched between a supply power polarity using a selection switch and a single power supply system and a single gas supply system As the integrated TIG and MIG welding functions can be integrated, the integrated system of TIG and MIG welding functions can be realized, so that the welding work can be easily performed even in a narrow welding space, and the TIG welding apparatus and the MIG welding apparatus can be separately There is no need to provide a large amount of cost savings.

In addition, in the present invention, in the welding power supply device for a welding system, a switching transistor for an inverter is provided so as to eliminate internal parasitic capacitance and parasitic inductance generated in the switching process of the respective reading and driven half bridge inverters The switching loss can be minimized and the large current can be generated according to the size of the welding load by making it possible to switch when the voltage value approaches zero and preventing generation of large current even if the welding load is increased through the power blocking capacitor So that the internal power loss can be minimized, so that the conversion efficiency with respect to the DC power supply voltage output of the high frequency can be greatly improved.

Further, in the present invention, in the arc welding system, when the set voltage is supplied from the welding power source device to the welding torch via the cable feed device, the short- And the current and voltage values can be compensated according to the calculation result, it is possible to secure the work stability for the arc welding work and to improve the welding quality .

1 is a view showing the overall configuration of a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.
2 is a view showing a specific configuration of a welding power source device and a wire feeding device in a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.
FIG. 3 is a graph showing a function of measuring a state in which an output voltage value falls during a welding operation time in a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.
FIG. 4 is a view showing a detailed configuration of a power conversion and supply unit having an inverter and a converter function capable of phase adjustment in a welding apparatus having a multiple welding technique according to an embodiment of the present invention.
5 is a diagram illustrating a specific configuration of an ignition device in a welding apparatus having a multiple welding technique according to an embodiment of the present invention.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a view showing the overall configuration of a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.

1, a welding apparatus equipped with a multiple welding technique according to the present invention includes a welding power supply device 100, a remote controller 200, a gas supply unit 300, a selection switching unit 400, A device 600, a MIG welding torch 700, a MIG welding base material 710, an ignition device 800, a TIG welding torch 900, and a TIG welding base material 910.

The welding power supply device 100 supplies a power supply current and a voltage required for arc welding and measures and calculates a drop in the output voltage value as the arc welding progresses to automatically compensate the current and voltage values.

The remote controller 200 is for remotely operating the welding operation of the MIG welding torch 700 or the TIG welding torch 900 through the selection switching unit 400 using CAN communication.

Here, the remote controller 200 uses CAN communication as a communication method for remote operation, but it is not limited to this, and it is also possible to use an RS485 communication method or the like.

The gas supply unit 300 is configured to supply the carbon dioxide gas and the argon gas to the selective switching unit 400 in the state where the carbon dioxide gas and the argon gas for arc welding are stored in respective tanks, Supply.

In the state where carbon dioxide gas and argon gas from the gas supply unit 300 are supplied to the selective switching unit 400, the MIG welding torch 700 is operated in accordance with the selection switching operation of the selection switching unit 400 Carbon dioxide gas may be selectively supplied, or argon gas may be selectively supplied to the TIG welding torch 900.

The selection switching unit 400 receives a DC power supply voltage from the welding power supply device 100 and a communication line for CAN communication from the remote controller 200. The gas supply unit 300 supplies the carbon dioxide (+) Polarity and (-) polarity of the DC power supply voltage are selectively supplied to the MIG welding function or the TIG welding function by selective switching for selectively switching the function to the MIG welding function or the TIG welding function, The TIG welding base material 910 and the TIG welding torch 900 so that carbon dioxide gas or argon gas is supplied to the MIG welding torch 700 or the TIG welding torch 900, So that the remote controller 200 can selectively operate the MIG welding torch 700 or the TIG welding torch 900 selectively And so.

The wire feeding device 600 controls the feeding speed of the MIG welding wire to feed the wire to the MIG welding torch 700 and supplies the voltage of positive polarity from the welding power source device 100 through the cable To the MIG welding torch 700.

The MIG welding torch 700 is supplied with the welding wire from the wire feeding and feeding device 600 and is supplied with the positive polarity voltage and performs the welding operation by receiving the carbon dioxide gas. 710 are supplied with a (-) polarity DC power supply voltage through a grounding cable in accordance with the switching of the selection switching unit 400.

The ignition device 800 receives a DC voltage of negative polarity through a grounding cable in accordance with the selection switching by the selection switching unit 400 and generates a high voltage for generating an arc for TIG welding (that is, 7,000 to 8,000 V ) And applies the TIG welding torch 900 to the TIG welding torch 900.

The TIG welding torch 900 receives a DC voltage of negative polarity converted to a high voltage through the ignition device 800 according to a selection switch operation of the selection switching unit 400, And the welding operation is performed. The TIG welding base material 910 is connected to the switching device 400 through the grounding cable in accordance with the switching of the selection switching part 400 so that the (+) polarity DC power supply voltage.

Next, Fig. 2 is a view showing a specific configuration of a welding power source device and a wire feeding device in a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.

2, the welding power supply device 100 includes a power conversion and supply unit 10, a power measurement unit 20, a welding power control unit 30, and a power compensation unit 40.

The power conversion and supply unit 10 rectifies and smoothes the AC power and converts the AC power into DC power, adjusts the voltage value to a voltage required for arc welding, and outputs a voltage of positive polarity and a voltage of negative polarity, (400).

Here, the power conversion and supply unit 10 adjusts and applies the output current and the output voltage of the power source according to the compensation value by the power compensation operation by the power compensation unit 40. [

The power measuring unit 20 measures the welding current and the output voltage applied to the MIG welding torch 700 or the TIG welding torch 900 according to the selection switching of the selection switching unit 400, And supplies the measured values of the welding current and the output voltage to the welding power source control unit 30. [

3, the power measurement unit 20 is connected to the MIG welding torch 700 and the TIG welding torch 900 by the current and voltage values of the arc welding at the start of the arc welding operation The change of the welding current and the output voltage in the short period from T0 to T4 where the short circuit is caused due to the state where the output voltage value is lowered by the resistance due to the cable's own resistance and the dynamic reactance is measured.

The welding power control unit 30 receives the measured values of the welding current and the output voltage in the leak current state at the beginning of the arc welding operation measured by the power measuring unit 20 at every repetitive welding operation, And calculates an Ohm resistance value and an inductive reactance resistance value determined according to the lengths of the respective cables connected to the MIG welding torch 700 and the TIG welding torch 900, The welding current and the output voltage are compensated by the voltage value of the welding arc by calculating the voltage value of the welding arc based on the value and the resistance value.

As shown in FIG. 3, the welding power supply control unit 30 receives a variation value of a welding current and an output current according to a leakage current state at the start of arc welding provided from the power source measurement unit 20, The average value of the welding current and the output voltage is calculated for each moment of the leakage duration as shown in Equation (1).

Here, "N" represents the number of times of measurement of the average value, "Vout" represents the output voltage, and "Iout" represents the welding current.

In FIG. 3, " T0 "represents a time period of a short circuit start due to the start of arc welding," T1 "represents a start interval of a first average value calculation corresponding to 100 to 500 milliseconds (ms) Represents the end interval (the start interval of the second average value calculation) of the first average value calculation corresponding to 500 to 1,000 milliseconds (ms) from the T1, and "T3" represents the second interval corresponding to 500 to 1,000 milliseconds Represents the ending period of the average value calculation, and "T4" represents the ending period of the leakage period according to the end of the arc welding. T1 "represents an interval during which the output voltage" Vout (t) " becomes the maximum value in an interval of 250 microseconds (μs) after the temporary end of the arc welding due to the completion of the arc welding, Quot; DELTA I (t2) "at the interval of 250 microseconds (μs) since the end of the short time due to the end of the short period of time.

On the other hand, the welding power source control unit 30 calculates the MIG welding torch 700 and the TIG (TIG) according to the calculation result of the welding current and the output voltage according to the leakage current moment calculated by Equation (1) A self-ohm resistance R value according to the length of the cable connected to the welding torch 900, and a resistance value L according to the inductive reactance, respectively.

Iout (t) - Iout (t - delta) is the time interval during measurement, and " "Represents the difference between the current measurement value of the welding current and the existing current measurement value, and" Varc (t) "represents the voltage value of the welding arc.

At this time, the voltage value (Varc (t)) of the welding arc can be calculated by the following equation (3).

Therefore, the welding power source control unit 30 can confirm the output voltage and the welding current value through the calculation result of the voltage value (Varc (t)) of the welding arc.

The power compensating unit 40 compensates the power for the output current and voltage supplied from the power converting and supplying unit 10 according to the compensation amount of the welding current and the output voltage from the welding power source control unit 30 .

2, the wire feeding and dispensing device 600 includes a feeding control module 50, a wire feeding module 60, a power setting unit 80, and a display unit 90.

The feeding control unit 50 is operated by control communication with the welding power source control unit 100 of the welding power source device 100 to control feeding and controlling the feeding speed of the wire fed to the MIG welding torch 700, .

The wire feeding part 60 is composed of a wire reel and a wire drive so as to feed the wire to the MIG welding torch 700 according to feeding control of the feeding control part 50 .

The power supply setting unit 80 performs a button operation for setting the current and voltage supplied through the cable 70 by driving the wire feeding and feeding device 600, And the setting state of the current and voltage through the switch 80.

The cable 70 is extended with a predetermined length between the wire feeding device 600 and the MIG welding torch 700 and is connected to the cable switching device 400 via the wire feeding / (+) Polarity DC output voltage supplied from the welding power source device 100 to the MIG welding torch 700 in accordance with the DC voltage.

2, the welding power source device 100 starts to operate, and a voltage of positive polarity and a negative polarity are supplied to the selection switching unit (not shown) through the power conversion and supply unit 10, 400.

A DC output voltage from the power conversion and supply unit 10 is supplied to the MIG welding torch 700 and the MIG welding base material 710 or the TIG welding torch When the arc welding operation is started through the MIG welding torch 700 or the TIG welding torch 900 as the welding power source 900 and the TIG welding base material 910 are started, (30) repeatedly receives a change value of the output voltage and a change value of the welding current according to the termination period of the welding from the start of arc welding measured by the power source measuring unit (20) And calculating an inductance reactance value and an inductance resistance value of the cable connected to the MIG welding torch 700 or the TIG welding torch 900 by the average value,Applying each computed value group is calculated by the voltage value of the welding arc.

Accordingly, the welding power source control unit 30 calculates the compensation value for the variation of the welding current and the output voltage by calculating the voltage value of the welding arc, and according to the compensation processing operation of the power source compensation unit 40, So that the output current and the output voltage of the power conversion and supply unit 10 are compensated.

4 is a view illustrating a detailed configuration of a power conversion and supply unit having a function of an inverter and a converter capable of phase adjustment in a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.

4, the power conversion and supply unit 10 configured in the welding power supply device 100 includes a power module (Power) connected to both ends of the first and second power input terminals (+ V1, -V1) And a power reactor 32 connected to the output terminal of the power module 10 and having an output terminal connected to the first and second power output terminals + V2 and -V2, .

The power module 10 includes first and second power transistors TR1 and TR2 and first and second resonant capacitors C1 and C2 between both ends of the first and second power input terminals (+ V1 and -V1) A first half bridge inverter having a reading function and a third and a fourth power transistors TR3 and TR4 and a third and a fourth resonance capacitors C3 and C4 A power blocking circuit 22 connected between the first half bridge inverter and the second half bridge inverter, a second half bridge inverter having a second half bridge inverter connected to the first half bridge inverter, A first power transformer 14 having an output terminal and an output terminal of the power blocking circuit 20 connected to both ends thereof and an output terminal of the second half bridge inverter and an output terminal of the power blocking circuit 20 being connected to both ends, The second power transformer 12, the first and second power transformers 14 and 12, A rectifier circuit composed of first and second rectifier diodes D1 and D2 connected to the second output side secondary windings T2-1 and T2-2 of the pair of transformers for generating the first and second transformers, Is connected to the second output side secondary coils (T2-1, T2-2) of the transformer pair constituting the power transformers (14, 12), and the first and second rectifying diodes (D1, D2) The buffer inductors FT1 and FT2 for decreasing the level of the impact loss to the power transistors TR1, TR2, TR3 and TR4 and the overall noise level and the smoothing inductors FT1 and FT2 for reducing the overall noise level, And an inductor 18.

The output of the rectifier circuit constituting the power module 10 and the output terminal of the cushioning inductor 18 are connected to the input side of the power reactor 32 and the first and second power output terminals + , -V2), a large inductive reactance is generated for a sudden change of the alternating current or current included in the direct-current output voltage from the power module 10. [

Here, the power reactor 32 reduces the noise by smoothing the voltage waveform using one common core for the first and second power output terminals (+ V2, -V2) The role is to perform the role. Therefore, since the power reactor 32 plays the same role as the smoothing inductor 18, the smoothing inductor 18 may be removed from the device circuit of the present invention.

In the power module 10, the first half bridge inverter includes first and second power input terminals (+) and (+) in a state where the first power transistor (TR1) and the second power transistor (TR2) The first power transistor TR1 and the second power transistor TR2 are connected in parallel to both ends of the first resonant capacitor C1 and the second resonant capacitor C2 ) Are connected in parallel.

The second half bridge inverter is connected in parallel to both ends of the voltage input terminals (+ V1, -V1) in a state where the third power transistor (TR3) and the fourth power transistor (TR4) The third power transistor TR3 and the fourth power transistor TR4 are connected in parallel to the third resonance capacitor C3 and the fourth resonance capacitor C4, respectively, on the power supply electrode.

Meanwhile, the first and second half bridge inverters are divided into a "leading" and a "driven", respectively, and the division is determined by the phase sequence according to the switching operation of the power transistors constituting each inverter.

The power blocking circuit 22 includes a first blocking capacitor C5 and a second blocking capacitor C6 connected in series between the first half bridge inverter and the second half bridge inverter, And are connected in parallel to both ends of the first and second power input terminals (+ V1, -V1).

The first power transformer 14 is connected to an output terminal corresponding to a series connection point of the first power transistor TR1 and the second power transistor TR2 of the first half bridge inverter, And the other end thereof is connected between the first blocking capacitor C5 of the power blocking circuit 22 and the series connection point of the second blocking capacitor C6.

The second power transformer 12 has a primary coil T1-1 at an output terminal corresponding to a series connection point of the third power transistor TR3 and the fourth power transistor TR4 of the second half bridge inverter, And the other end thereof is connected between the first blocking capacitor C5 of the power blocking circuit 22 and the series connection point of the second blocking capacitor C6.

That is, a series connection point of the first blocking capacitor C5 and the second blocking capacitor C6 of the power blocking circuit 22 is connected to the first power supply voltage transformer 14 and the second power supply voltage transformer 12 And are commonly connected to the primary coils T1-2 and T1-1.

An auxiliary inductor 16 is connected between the output terminal of the first half bridge inverter and one end of the primary coil T1-2 of the first power transformer 14, And a balancing capacitor C7 is connected between the output terminal and the primary coil T1-1 of the second power transformer 12.

The first output side secondary coil (T2-3, T2-4) and the second output side secondary coil (T2-1, T2) of the transformer pair including the first power transformer (14) and the second power transformer (12) The first output side secondary coil T2-3 and the second output side secondary coil T2-4 of the first power supply transformer 14 are connected in parallel to each other, Are sequentially connected to respective corresponding half coils (second output side secondary coils T2-1, T2-2) of the second power supply transformer 12 in order. That is, the lead portion of one half coil and the end portion of another half coil are connected together.

The first and second rectifying diodes D1 and D2 constituting the rectifying circuit are connected to the second output side secondary coil T2-1 and T2-2 from the coil- And T2-2, respectively.

The common connection point of the first and second rectifying diodes D1 and D2 is connected to the first power output terminal + V2 via the power reactor 32, and the first and second power transformers 14, The cushioning inductor 18 connected to the secondary coil on the output side of the transformer 12 is connected to the second power output terminal -V2 through the power reactor 30. [

4, according to the power conversion and supply unit 10, in order to convert AC power applied through the first and second power input terminals (+ V1, -V1), the first half bridge The first and second power transistors TR1 and TR2 constituting the inverter are first switched and the third and fourth power transistors TR3 and TR4 constituting the second half bridge inverter are subsequently switched, An output AC voltage from each half bridge inverter is applied to the lead portion of the primary coil T1-2 of the first power transformer 14 and the end of the primary coil T1-1 of the second power transformer 12 . At this time, the shapes of the voltages applied to the primary coils of the first and second power supply transformers 14 and 12 have waveforms similar to those of the Meander Wave.

The first and second power transformers 14 and 12 connected to the connection point of the first blocking capacitor C5 and the second blocking capacitor C6 constituting the power blocking circuit 22, The voltage applied to the coupling center point of the primary coil has a voltage value corresponding to 1/2 of the output AC voltage. That is, the voltage value corresponding to one-half of the output AC voltage is equal to 0.5 × V1 with respect to the input AC voltage, and the amplitude of the corresponding voltage phase is ± 0.5V1.

These voltages are converted to the required level and summed arithmetically, the first and second output-side secondary coils T2-3, T2-4, T2-T3 of the first and second power transformers 14, 12, 1, T2-2) are considered as the half-coil.

The first output side secondary coil (T2-3, T2-4) and the second output side secondary coil (T2-1 (T2-1, T2-2) are connected by the voltage applied to the primary coil of the first and second power supply transformers And T2-2 are smoothed through the buffer inductors FT1 and FT2 and then rectified by the first and second rectifying diodes D1 and D2, The DC output voltage V2 is obtained at the first and second power output terminals (+ V2, -V2)

The DC output voltage V2 is applied between the power transistors TR1 and TR2 of the first half bridge inverter and the output voltage phases of the power transistors TR3 and TR4 of the second half bridge inverter The voltage phase is adjusted in such a manner as to adjust the phase shift angle of the phase shifter.

At this time, the output voltage phase in the second half bridge inverter is less than the output voltage phase in the first half bridge inverter, and the phase shift control angle between the first half bridge inverter and the second half bridge inverter Each of the output voltages from the first half bridge inverter and the second half bridge inverter becomes inphase and the voltage of each of the first and second half bridge inverters 14, The arithmetic sum of the voltages in consideration of the polarities in the secondary coils T2-3, T2-4, T2-1, and T2-2 becomes zero. Therefore, the first and second power output terminals + V2 and -V2, The DC output voltage V2 output to the inverter becomes zero.

When the phase shift angle of the output voltage between the first half-bridge inverter and the second half-bridge inverter is small, each output-side secondary coil of the first and second power transformers (14, 12) 3, T2-4, T2-1, T2-2), the voltage is arithmetically summed to produce a bipolar pulse with a low impact factor (Impact Duty Ratio), and the first and second And the DC output voltage V2 output to the power output terminals (+ V2, -V2) shows a low level.

On the other hand, when the phase shift angle of the output voltage between the first half bridge inverter and the second half bridge inverter increases, the output side secondary coils of the first and second power supply transformers (14, 12) (T2-3, T2-4, T2-1, T2-2) increases and the DC output voltage (V2, -V2) output to the first and second power output terminals (V2) also increases.

However, the amplitude and the shape of the voltage applied to the primary coils T1-2 and T1-1 of the first and second power supply transformers 14 and 12 (the amplitude is ± 2.5 V1, the shape is close to the meander wave) Is not correlated with the phase shift control angle since the connection point of each primary coil is connected to the connection point of the first blocking capacitor C5 and the second blocking capacitor C6 of the power blocking circuit 22 .

Therefore, a DC magnetizing current flows through the primary coil, which is stored in the magnetizing inductors of the primary coils of the first and second power supply transformers 14 and 12, and the respective powers of the first and second half bridge inverters C2, C3, C4) while the transistors TR1, TR2, TR3, and TR4 are switched so that the ZVT (Zero Voltage Transition) occurs when the output current of the converter is zero or minimum, State is realized.

Meanwhile, the energy stored in the magnetizing inductor becomes insufficient while the output currents to the first and second power output terminals (+ V2, -V2) increase, but the energy stored in the first and second power supply transformers (14, 12) The energy stored in the dispersion inductors of the coils T1-2 and T1-1 starts to play a large role and when the output current of the power module 10 is large and the phase shift control angle is large, , C2, C3, C4) and ZVT.

However, when the output current of the power module 10 is small or a median value of about 10 to 30%, the phase shift control angle is in the range of 0 to 20%, and the first and second transformers 14, and 12), most of the energy is discharged to the same-sized load. Therefore, the stored energy is insufficient and the load is not so large, and the current in the primary coil is still small. .

This is related to the first half bridge inverter because the first and second power transistors TR1 and TR2 therein are switched under the indicated conditions when the current is smaller than in the second half bridge inverter.

To compensate for this, the auxiliary inductor 16, which is applied as an additional resonant inductor, serves to help the accumulated additional energy reach the ZVT state in the first half bridge inverter in all load regions.

The auxiliary inductor 16 may be fabricated in a saturated state so that the ratio of the maximum and minimum currents can be optimized because the first half bridge inverter can obtain the ZVT state at a small load current ZVT is secured to a small extent when the load current is intermediate, and has little effect when the load current is large.

On the other hand, each of the first and second blocking capacitors C5 and C6 of the power blocking circuit 22 can prevent a large amount of current from flowing when the load is increased. This is because the first and second half- The power supply current flows only through the primary coils of the first and second power supply transformers 14 and 12 which are turned on in order according to the operation of the first power transformer 14 and the second power transformer 12. Therefore, the capacity of the first and second blocking capacitors C5 and C6 may not be large, and the loss therein may be reduced to several times.

The magnetic circuit of the first and second power supply transformers 14 and 12 is asymmetric to the inside of the power module 10 when the corresponding power module 10 operates under a condition that the load rapidly changes over a wide range. There is a possibility that the power transistor 10 is brought into a magnetized state and the magnetic flux saturates and a failure occurs in the power transistor of the half bridge inverter or a protection operation of the power transistor occurs, There is a possibility of causing interruption.

To solve this, the balancing capacitor C7 compensates for the dynamic constant factor increase of the magnetizing current for the primary coils of the first and second power transformers 14, 12, so that each power transformer 14, 12 Can be prevented from being switched to the saturated state.

5 is a view showing a specific configuration of an ignition device in a welding apparatus equipped with a multiple welding technique according to an embodiment of the present invention.

As shown in FIG. 5, the ignition device 800 includes a transformer 810 and an ignition operation processing unit 820.

The transformer 810 applies a voltage of (-) polarity of, for example, 50 to 120 V applied in accordance with the selective switching of the selection switching unit 400 to a high voltage of, for example, 7,000 to 8,000 V, Sec and applied to the TIG welding torch 900 at a predetermined pulse time interval.

The ignition operation processing unit 820 outputs a predetermined pulse time (for example, 3 seconds), a start-up time (for example, 0.2 seconds), an ignition pulse period (For example, 0.1 second) and an ignition pulse time (e.g., 0.5 microsecond (microsecond)), and the ignition pulse of the high voltage according to the set time and the set period is .

Here, it is preferable that the duty ratio according to the output voltage of the welding current set in the ignition operation processing unit 820 has 60% at 300V and 100% fmf at 200V.

Meanwhile, the ignition device 800 can be manufactured as a built-in type which is integrated in the apparatus of the present invention for convenience, and can be manufactured in a detachable manner. It can be manufactured as an external device that is manufactured separately from the related accessory devices such as the switching unit 400 and the wire feeding device 600 and can be connected through a cable.

In addition, according to the present invention as described above, the welding power supply device 100, the remote controller 200, the gas supply unit 300, the selection switching unit 400, the wire feeding device 600, The welding apparatus having the multiple welding technique including the welding apparatus 700, the MIG welding base material 710, the ignition device 800, the TIG welding torch 900, and the TIG welding base material 910 is composed of a single device However, it should be understood that the present invention is not limited thereto. It is of course possible to connect the welding apparatuses in a plurality of at least two or more, and simultaneously apply them in accordance with the required capacity at the welding site.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

100: welding power supply device 200: remote controller
300: gas supply unit 500: selection switching unit
600: wire feeding device 700: MIG welding torch
710: Base material for MIG welding 800: Ignition device
900: TIG welding torch 910: TIG welding base material

Claims (12)

A welding power supply device for supplying a DC power supply current and voltage necessary for arc welding and measuring and calculating a drop in the output voltage value as the arc welding progresses to compensate the current and voltage value;
A gas supply unit for supplying carbon dioxide (CO2) gas and argon (Ar) gas for arc welding to the selective switching unit, respectively;
By switching for selective switching to MIG (Metal Inert Gas) welding function or TIG (Tungsten Inert Gas) welding function, the DC power supply current and voltage are applied to the MIG welding torch and MIG welding base material or TIG welding base material and A selective switching unit adapted to be selectively supplied to the TIG welding torch and to selectively supply carbon dioxide gas or argon gas to the MIG welding torch or the TIG welding torch;
A wire feed device feeding a wire to the MIG welding torch according to a MIG welding function and applying a voltage of positive polarity applied through selective switching of the selection switching part to the MIG welding torch; And
And an ignition device for receiving the DC power supply voltage through the selective switching of the selection switching unit according to the TIG welding function and converting the DC voltage into a high voltage for generating arc for TIG welding and applying the DC voltage to the TIG welding torch and the base material for TIG welding,
The selection switching unit applies a DC voltage of positive polarity to the MIG welding torch and applies a DC voltage of negative polarity to the MIG welding base material according to selective switching for the MIG welding function,
(-) polarity DC voltage is applied to the TIG welding torch and a DC voltage of negative polarity is applied to the TIG welding base material according to the selective switching for the TIG welding function. Equipped welding apparatus. delete A welding power supply device for supplying a DC power supply current and voltage necessary for arc welding and measuring and calculating a drop in the output voltage value as the arc welding progresses to compensate the current and voltage value;
A gas supply unit for supplying carbon dioxide (CO2) gas and argon (Ar) gas for arc welding to the selective switching unit, respectively;
By switching for selective switching to MIG (Metal Inert Gas) welding function or TIG (Tungsten Inert Gas) welding function, the DC power supply current and voltage are applied to the MIG welding torch and MIG welding base material or TIG welding base material and A selective switching unit adapted to be selectively supplied to the TIG welding torch and to selectively supply carbon dioxide gas or argon gas to the MIG welding torch or the TIG welding torch;
A wire feed device feeding a wire to the MIG welding torch according to a MIG welding function and applying a voltage of positive polarity applied through selective switching of the selection switching part to the MIG welding torch; And
And an ignition device for receiving the DC power supply voltage through the selective switching of the selection switching unit according to the TIG welding function and converting the DC voltage into a high voltage for generating arc for TIG welding and applying the DC voltage to the TIG welding torch and the base material for TIG welding,
The welding power source device includes a power conversion and supply unit for converting an AC power source to a DC power source and adjusting the voltage to a voltage required for arc welding to apply the DC power source current and voltage to the selection switching unit,
A power measuring unit for measuring a state where a welding current and an output voltage applied to the MIG welding torch and the TIG welding torch through a cable are changed in accordance with a progress time of an arc welding operation,
Wherein the control unit calculates a voltage value of a welding arc based on a change value of a welding current and an output voltage measured through the power measuring unit according to progress of the arc welding by the welding torch, A welding power supply controller for performing compensation control for compensating a voltage value,
And a power compensator operable to compensate and output the output current and voltage of the power supply and supply unit according to the compensation control of the welding power supply control unit. The method of claim 3,
Wherein the power measuring unit measures a change value of a welding current and an output voltage during a short leakage period which is generated as the welding torch starts arc welding. The method of claim 3,
Wherein the welding power control module repeatedly receives the welding current and the output voltage measured from the power measuring module at each progress time of the arc welding and calculates an average value of the welding current and the output voltage. Welding apparatus. The method of claim 3,
The power conversion and supply unit includes a first half bridge inverter that is connected in parallel between both ends of a power input terminal to perform switching for voltage conversion,
A second half bridge inverter that is connected in parallel between both ends of the power input terminal at a rear stage of the first half bridge inverter to perform switching for voltage conversion,
A power blocking circuit connected in parallel between the connection node of the first half bridge inverter and the connection node of the second half bridge inverter to perform blocking for reducing a current load,
A first power transformer connected to an output terminal of the power blocking circuit and a connection center point of each primary coil and corresponding to each output terminal of the first and second half bridge inverters,
A rectifier circuit connected to the secondary coil of the first and second power supply transformers to rectify the AC voltage,
And a power reactor having one end connected to the output terminal of the rectifying circuit and the other end connected to the power output terminal to generate a reactance against a change in current of the DC output voltage. The method according to claim 6,
Wherein the power blocking circuit comprises two first and second blocking capacitors connected in series to each other and a series connection point of the first and second blocking capacitors being connected to each primary coil side connection of the first and second power transformers And the welding point is connected to the center point. The method according to claim 6,
An auxiliary inductor is connected between the first half bridge inverter and the connection end of the first power transformer so as to ensure a ZVT (Zero Voltage Transition) state at a small load current by the first half bridge inverter And a welding device having a multi-welding technique. The method according to claim 6,
And a balanced capacitor is connected between the second half bridge inverter and the connection node between the second half bridge inverter and the second power supply transformer to compensate for an increase in the dynamic constant factor of the magnetizing current with respect to the primary coil of the first and second power supply transformers A welding device with multiple welding techniques. The method according to claim 6,
Wherein soft switching is performed on the rectifying elements of the rectifying circuit between the secondary coil side of the first and second power supply transformers and the power reactor and the switching elements of the first and second half bridge inverters Characterized in that a cushioning inductor is connected which reduces the level of impact loss to the welding device. A welding power supply device for supplying a DC power supply current and voltage necessary for arc welding and measuring and calculating a drop in the output voltage value as the arc welding progresses to compensate the current and voltage value;
A gas supply unit for supplying carbon dioxide (CO2) gas and argon (Ar) gas for arc welding to the selective switching unit, respectively;
By switching for selective switching to MIG (Metal Inert Gas) welding function or TIG (Tungsten Inert Gas) welding function, the DC power supply current and voltage are applied to the MIG welding torch and MIG welding base material or TIG welding base material and A selective switching unit adapted to be selectively supplied to the TIG welding torch and to selectively supply carbon dioxide gas or argon gas to the MIG welding torch or the TIG welding torch;
A wire feed device feeding a wire to the MIG welding torch according to a MIG welding function and applying a voltage of positive polarity applied through selective switching of the selection switching part to the MIG welding torch; And
And an ignition device for receiving the DC power supply voltage through the selective switching of the selection switching unit according to the TIG welding function and converting the DC voltage into a high voltage for generating arc for TIG welding and applying the DC voltage to the TIG welding torch and the base material for TIG welding,
Further comprising a remote controller for remotely operating the welding operation of the MIG welding torch or the TIG welding torch by selective switching through the selection switching unit using any one of communication method of CAN communication or RS485 communication Welding apparatus with multiple welding techniques. 12. The method according to any one of claims 1 to 11,
Characterized in that the welding apparatus is connected to at least two or more welded joints to perform a simultaneous welding operation.

Images