KR100352410B1 - Electronic Tungsten Inert Gas welding supplementary apparatus - Google Patents

Abstract

The present invention relates to an electronic TIG welding auxiliary device provided between an arc welding machine and a welding torch to enable TIG welding with a conventional manual arc welding machine, comprising: a control power supply unit 11 for transforming and supplying power; A high frequency oscillation power rectifier 12 for rectifying a high frequency oscillation power supply; A high frequency processing unit for oscillating and amplifying the rectified high frequency oscillation power source to induce high frequency; A welding start signal unit 21 for providing an arc start signal; A welding power source control electronic contactor 24 for controlling the on / off of the welding power source in accordance with the presence or absence of welding; A welding voltage detector 23 which detects an input voltage when the magnetic contactor 24 for welding power supply control is operated (ON); A sequence control unit 22 for operating the welding power source control contactor 24 to block high frequency oscillation power sent through the high frequency control unit or to weakly control the oscillation intensity; A crater use setting unit 31 which provides a crater processing switching signal according to the crater use setting; A welding gas supply time setting unit 41 for setting a supply time of a welding gas; A welding torch cooling control unit 51 which drives the connected welding torch cooling device during cooling to cool the heat generated by the welding torch; A welding gas supply / blocking control unit 42 for supplying a welding gas; And a welding current setting and crater setting unit 32 for converting a welding current to a crater setting current value during welding.

Description

Electronic Tungsten Inert Gas welding supplementary apparatus

The present invention relates to a Tungsten Inert Gas (TIG) welding aid, and more particularly, to an electronic TIG welding aid provided between an arc welder and a welding torch to enable TIG welding with a conventional manual arc welder.

In general, Tungsten Inert Gas (TIG) welding shields air with argon gas, which is an inert gas, between the tungsten electrode (-) and the base material (+) of the torch and breaks the insulation between the electrode and the base material to generate an arc and weld with arc heat. It is difficult to start the arc because it does not have the function to destroy the insulation between the electrode and the base material, and there is no argon gas supply and interruption function, so it is necessary to supply gas manually. Not free

In the conventional TIG welding method using an arc welder, as shown in FIG. 1, a transformer A1 supplied with 220 / 380V power and converted into a welding suitable voltage, an output adjusting unit A2 for adjusting an output current, and an argon gas for welding Is composed of a valve A3 for manually supplying / closing the A, and an arc generator A4 for generating an arc in contact with the base material.

Looking at the operation of the TIG welding apparatus according to the prior art as follows. As the primary voltage applied to the welder is induced by the transformer ratio of the transformer A1, the secondary voltage is induced at the secondary terminal, and this potential is connected to the torch but no arc is generated, so no-load voltage is induced and The arc is generated in the arc generating unit A4 by contacting the tungsten electrode of the torch to the base material while supplying argon gas through the valve A3. At this time, if the welding current is low or high, after adjusting the current by the output adjusting unit (A2) or other control device, it is necessary to generate and weld the arc again.

In the prior art as described above, the welding torch is always induced with a high no-load voltage (AC 80 ~ 90V, DC 60 ~ 80V), there is a problem that there is a risk of safety accidents such as electric shock, the supply and shutdown of argon gas Since it is necessary to operate manually, there is a problem that it is cumbersome and increases the gas consumption, and there are various problems such as tungsten, which is a torch electrode, is quickly consumed during arc start, and is mixed in the welding area, thereby increasing the welding failure rate.

Looking at the problem of TIG welding using a conventional arc welder in more detail, there is a problem using the scratch (Scratch) method to generate an arc by directly contacting the electrode to the base material. First, a tungsten electrode rod is mixed in a base material and welding defects occur. Second, the electrode rods are quickly damaged and clean welding is difficult. Third, the welder's skills must be significantly higher. Fourth, the gas is cut off manually, so there is a lot of gas loss. Fifth, the quality of welding is poor because cratering is impossible. Sixth, there is a problem that the productivity is very low because it is made manually.

The present invention has been proposed to solve the above problems of the prior art, the object of the present invention is provided between the arc welder and the welding torch, the operator is safe while using the existing arc welder as it is without purchasing a separate TIG welder The present invention also provides an electronic TIG welding auxiliary device capable of performing high quality TIG welding in a convenient and convenient manner. In addition, another object of the present invention is a general dry arc welding machine (AC, DC), an inflow arc welding machine, and a CC characteristic embedded CO. such as _2-welding, the engine generator welding machine, and other underwater properties and welding machine having a constant current characteristic is to provide an electronic TIG welding the auxiliary unit that is compatible regardless of welding type. it is another object of the present invention is less than 20kg weight of the product It is easy to carry, provides maximum convenience for use, and it is 1/7 of the price of general TIG welding machine. In addition, another object of the present invention is to provide an electronic TIG welding apparatus that can be easily connected and used without moving the TIG welder in the field using multiple arc welders. It is another object of the present invention to provide an electronic TIG welding auxiliary device that can save time and money. In addition, another object of the present invention is to be installed close to the welding area, so that the welding maneuver is good, there is no argon gas loss, and the welding torch To provide an electronic TIG welding auxiliary device that enables the cooling device to be compact when mounted on the cooling device.

1 is a view for explaining a conventional TIG welding method using an arc welder.

2 is a view showing an example of a state using the electronic TIG welding aid according to the present invention.

3 is a block diagram of an electronic TIG welding auxiliary apparatus according to the present invention.

4 is an overall circuit diagram of the electronic TIG welding aid according to the present invention.

5 is a circuit diagram of a power supply unit according to the present invention.

6 is a sequence control circuit diagram according to the present invention.

7 is a circuit diagram of a high frequency oscillator according to the present invention.

8 is a circuit diagram of a high frequency induction part according to the present invention.

9 is a circuit diagram of a welding current and crater setting unit according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Welding power (-) input terminal 2: Welding power (+) input terminal

11: control power supply

12: power rectifier for high frequency oscillation 14: high frequency oscillation amplifier

15: high frequency high voltage transformer 16: high frequency induction part

21: welding start signal unit 22: sequence control unit

23: welding voltage detection unit 24: magnetic contactor for welding power control

25: high frequency control unit 31: crater use setting unit

32: welding current setting and crater setting unit

41: welding gas supply time setting unit 42: welding gas supply / interruption control

51: cooling device control unit for welding torch

In order to achieve the above object, the present invention provides a system for performing TIG welding using a conventional arc welding machine, comprising: a control power supply for separately transforming a 220v input into a power supply for a signal processing unit and a high frequency oscillation power supply as a small transformer; A high frequency oscillation power rectifying unit receiving a voltage from the control power supply unit to rectify the high frequency oscillation power; A high frequency processing unit which receives the high frequency oscillation power rectified from the high frequency oscillation power rectifying unit, oscillates at high frequency, amplifies and then boosts the high voltage to induce high frequency in the air core reactor; A welding start signal section for providing a welding start signal which is an arc start signal by a power signal obtained from the control power supply section; A welding power source control contactor connected to the welding power source (-) input terminal and configured to apply power by controlling on / off of the welding power source of the arc welding machine according to the presence or absence of welding; When the magnetic contactor for welding power control is turned on, the input voltage of the welding power source (-) input terminal 1 and the welding power source (-) input terminal is detected. A welding voltage detection unit recognizing a no-load when the value is more than a predetermined value and recognizing a welding state when the value is less than or equal to the predetermined value; When the welding start signal is input from the welding start signal part, the electromagnetic contactor for controlling the welding power is operated, and when high frequency is induced in the high frequency induction part while the argon gas is supplied between the welding torch and the base material, the insulation between the torch and the base material is destroyed. As the primary arc is generated and the welding current is formed secondly, the welding voltage is rapidly dropped by the load current, so that the high frequency oscillation power transmitted through the high frequency control unit is received from the welding voltage detection unit. Or a sequence controller for weakly adjusting the oscillation intensity; A crater use setting unit connected to the sequence control unit and providing a crater process switching signal according to the crater use setting; A welding gas supply time setting unit connected to the sequence control unit and configured to set a supply time of a welding gas; A welding torch cooling control unit for driving the connected welding torch cooling unit to cool the heat generated by the welding torch when being welded by the signal processing unit of the sequence control unit; A welding gas supply / blocking control unit supplying a welding gas by the arc start signal, and blocking a gas after a predetermined time gas delay by an arc stop and a gas delay set value by the welding end signal; And a welding current setting and a crater setting unit for converting a welding current to a crater setting current value according to the crater switching signal of the welder during welding. According to a feature, the high frequency processing unit receives a high frequency oscillation power rectified from the high frequency oscillation power rectifying unit for controlling the oscillation at high frequency; A high frequency oscillation amplifier including a high frequency oscillation unit and a high frequency oscillation amplifier for high frequency oscillation, and oscillating at high frequency for initial arc activation using an electronic vibration circuit; A high frequency high voltage transformer for boosting the electric potential oscillated at high frequency from the high frequency oscillation amplifier to a high voltage potential by a high voltage transformer; And a high frequency induction unit configured to induce high frequency in the reactor by receiving a high voltage potential boosted from the high frequency high voltage transformer to induce arc generation. According to another additional aspect of the present invention, the welding current setting may be performed. And the crater setting unit uses the circuit connected to the contact a of the relay to set the current setting value, and switches to the contact b to determine the volume value to be connected as the crater current, and allows the final welding by the set current value. In addition, according to another additional feature of the present invention, the welding torch cooling device control unit is operated by the operation of the cooling unit drive control unit of the contact point of the WCR, that is, WCR due to the reduction of the welding voltage due to arc generation Contact of b and the arc start relay It was cooled and the driving unit drives the cooling water pump and the motor cooling radiator, a cooling fan motor when mounting the compact cooling unit that cools the cooling water by hot heat generated in the binary welding torch is preferred.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an example of the use of the electronic TIG welding auxiliary apparatus according to an embodiment of the present invention, an arc welding machine, an argon gas container, a welding line (three lines: welding line, gas hose, operation line), which is a separate component, a welding torch The example which connected and used the electronic TIG welding assistance apparatus by this invention is shown. In more detail, the electronic TIG welding auxiliary device and the cooling device according to the present invention are connected to a three-line cable, such as a welding power source, an argon gas container, a welding machine current adjusting operation line, and a control line combining the control unit power supply. Referring to FIG. 2, the control power supply unit 11 and the high frequency oscillation shown in FIG. 3, which are connected to an existing arc welding machine (MMA) used in connection with a single-phase or three-phase power source, will be described below. Utilizes the output adjustment part of the power supply rectifier 12, and supplies other functions necessary for TIG welding, that is, supply and interruption of high frequency start and stop welding power required for arc start, supply and interruption of argon gas, welding self hold, and crater Processing, driving of the cooling device, and the like are controlled by the electronic TIG welding auxiliary control device according to the present invention.

3 is a view showing the configuration of the electronic TIG welding auxiliary apparatus according to the present invention. Referring to the accompanying drawings, the electronic TIG welding auxiliary apparatus according to the present invention is a welding power source (-) input terminal (1), welding Power supply (+) input terminal (2), control power supply unit 11, power supply rectifier 12 for high frequency oscillation, high frequency oscillation amplifier 14, high frequency high voltage transformer 15, high frequency induction unit 16, welding start signal unit 21, the sequence control unit 22, the welding voltage detection unit 23, the welding contact control magnetic contactor 24, the high frequency control unit 25, the crater use setting unit 31, the welding current setting and the crater value setting unit 32, a welding gas supply time setting unit 41, a welding gas supply / blocking control unit 42, and a welding device cooling unit control unit 51 for cooling the welding torch.

The configuration of the electronic TIG welding auxiliary apparatus according to the present invention is as shown in Figure 3 and look at the operation as follows.

The welding power source (-) input terminal 1 is connected to an input line of a welding power source of an arc welding machine, and one side of the detection line is connected to the welding power source (+) input terminal 2 and the other side is connected to a base material. When the control magnetic contactor 24 is operated, the welding voltage detection unit 23 detects an input voltage between the welding power source (−) input terminal 1 and the welding power source (+) input terminal 2. The welding voltage detection unit 23 recognizes whether the type of the welding power source is AC or DC and if the welding machine voltage value is above a certain value, it is recognized as no load, and if it is below a certain value, it is recognized as being welded and inputs it to the signal processing unit.

The control power supply unit 11 is a small transformer that separates and supplies a 220V input into a signal processing unit power and a high frequency oscillation power supply, and receives the voltage to rectify the high frequency oscillation power supply by the high frequency oscillation power rectifier 12. It is input to the high frequency oscillation circuit of the high frequency oscillation amplifier 14, and is sent to the high frequency induction unit 16 including an air core reactor using an electronic vibration circuit to induce high frequency to the high frequency induction unit 16. When the high frequency is induced in the state where the argon gas is supplied between the substrate and the base metal, the insulation between the torch and the base metal is destroyed, so that the primary arc is generated and the secondary main welding current is formed, so that the welding voltage drops rapidly due to the load current. The voltage detector 23 recognizes that the welding is in progress and transfers it to the sequence controller 22. The sequence control unit 22 cuts off the high frequency oscillation power transmitted through the high frequency control unit 25 (direct current: high frequency is required only at the initial arc start) or decreases the oscillation intensity (alternating current: continuously induces high frequency) You have to make it weak, but make it weak so that the arc is stable.

When the welding start signal unit 21 transmits a welding start signal to be welded by the welder, the signal processing unit of the sequence control unit 22 operates the electromagnetic contactor of the welding power source unit of the electromagnetic contactor 24 for controlling the welding power source. When the welding power is applied, the welding voltage detection unit 23 recognizes this and transmits a signal to the welding start signal unit 21. When the welding potential is not applied (when the welding power is turned off or not connected), the high frequency oscillates The crater circuit does not operate, and only argon gas is supplied for a delay setting period and then stopped.

When the welding potential is normally supplied, the process is performed as described above. Thus, an arc is generated between the base material and the welding torch and the arc is maintained even when the welding start signal is blocked depending on whether the crater is set or not. According to the welding current setting value of the setting and crater value setting unit 32, when welding is performed and the welding signal of the welding start signal 21 is transmitted once more when the welding of the welder is to be terminated, the welding signal is converted to the crater current value and the welding is performed. When the finishing operation proceeds to terminate the start signal of the welding start signal unit 21, the welding is finished and returns to the initial state, the electromagnetic contactor of the electromagnetic contactor 24 for controlling the welding power source is also cut off, and the welding potential is cut off. Argon gas cools the electrodes of the welding torch while supplying gas for a delay set time.

The welding current setting and crater setting unit 32 may be applied differently according to the type of arc welding machine, and if the remote control function is used, the function may be appropriately used. In the arc welding machine without the remote control function, only the welding self-maintaining function may be used. have.

When welding is performed by the signal processor of the sequence controller 22, the welding torch cooling device connected to the welding torch cooling device controller 51 may be driven to cool the heat generated by the welding torch.

4 is an overall circuit diagram of the electronic TIG welding auxiliary apparatus according to an embodiment of the present invention, and examples of detailed circuits of each configuration are shown in FIGS. 5 to 9.

Referring to FIG. 5, when the control power is input, the control power is input through the overcurrent protection fuse of the control power, and the high frequency oscillation power is converted to 22V and the other control power is connected to the rear end by the auxiliary transformer T1. The rectifier is rectified to DC by rectifying bridge diodes BD1 and BD2 and supplied to the respective control circuits.

FIG. 6 shows the sequence control circuit. The smoothing function of C1 connected to the output terminal of the control power supply increases the DC potential to about 24V, and controls each control circuit using the same, and is also used as a driving power source for a relay and a solenoid valve. .

Referring to the operation flow of the circuit started by the arc start signal from the arc start signal section, the "+" potential applied to CR1 is the initial state of Q3 (OFF state), and there is no current flow in the circuit, so that the zener diode (D2) When the breakdown voltage (approximately 3.6V) is exceeded, a "+" potential is applied to the base of Q1. Q1 is turned on and is transferred to the arc start switch through D3 and D4 and the noise removing reactor L1. CR2 and CR1 operate simultaneously, and the second trigger signal using these contacts is transmitted to the gas supply control circuit, the chiller drive control circuit, and the welding power supply drive, and the WCR of the arc detection circuit part that senses no-load voltage at the same time as the welding power is supplied. This operation supplies the oscillation circuit control power supply (DC 22V) to the high frequency oscillation circuit.

If CR1 is operated in the ON state of the arc start signal part, and an arc is generated, WCR is turned off and the self hold setting switch S3 is ON (self hold setting), the CR1 and CR2 flowing through D3 and D4 even if the arc start signal part is turned OFF. As the driving current flows through the CR1 a contact, the WCR b contact, and S3, the welding state is maintained, and the "-" potential formed through the S3, WCR b contact, and the CR2 a contact is applied to C2 through R4, thereby A "+" potential is generated at RATE through R2. Therefore, Q6 becomes conductive and the "+" potential is induced to D4 and L1, but the circuit is disconnected so that no circuit current is generated, so the arc is maintained without any effect on D2 and Q1.

The high frequency oscillation circuit shown in FIG. 7 is controlled by a signal of the WCR, and operates differently according to the type (AC, DC) of the welding power source.

In DC TIG welding, high frequency is required only at the beginning of arc start, so S2 is turned off to drive or stop the high frequency oscillation circuit by the WCR control signal.

WCR is turned on by no-load welding voltage and WCR is turned off when arc is generated. Therefore, high frequency control circuit can be controlled.However, in AC TIG welding where welding power is AC, high frequency should be induced during welding. The circuit is divided.

Stable power is supplied to the high frequency oscillation circuit by the constant voltage regulator (U2), and IC (U1), which is powered from the constant voltage regulator (U2), oscillates at a constant frequency to apply a pulse potential to the base of Q4 to drive switching. Q4 amplifies the signal and triggers the switching oscillation to a large current at Q5.

The high frequency oscillation power of about DC 25V is oscillated at a frequency of about 1 kHz by Q5 and is input to the high voltage transformer primary, and is boosted to a high voltage of about 1000 V by T2 shown in FIG. 8 and sent to the high frequency induction reactor.

The high frequency induction reactor winds a thick copper wire or aluminum coil on the outside and wraps the wire with a special coating (silicon-coated wire, etc.) on a ferrite core for a predetermined number of times to fix the high voltage and high frequency power inside the ferrite core. When this is induced, high frequency is induced in the thick wire through which the outer welding power flows, and argon gas is flowed between the welding torch and the base material, and at this time, high frequency is generated between the base material and the torch to destroy the insulation, so an arc occurs naturally.

Therefore, TIG welding is possible with the existing manual arc welding machine by connecting the electronic TIG welding device between the arc welding machine and the welding torch, the welding maneuver is good, there is no argon gas loss, the arc is easy to start, the welding defect is reduced and the welding quality is improved. Increase the lifespan of the electrode, improve productivity and save welding time and cost.

As described above, the electronic TIG welding auxiliary device according to the present invention can be purchased at a low price of 1/7 level of the TIG welding machine without the user of a conventional arc welding machine, without a separate TIG welding machine, and is very economical, within 20 kg It is easy to carry with its weight, so it can be used anywhere on the job site, and it can be used at high places, and it is possible to easily connect and use the electronic TIG welding device without moving the TIG welder at the site where several arc welding machines are used. It is effective to save welding time and cost.

In addition, since the electronic TIG welding auxiliary device according to the present invention can be installed in close proximity to the welding site, the welding maneuver is good, there is no argon gas loss, and when the welding torch cooling device is mounted, the cooling device can be made small and the arc is easy to start. There is an effect of improving welding quality by reducing welding defects and increasing the lifetime of the electrode.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (6)

In a system for TIG welding using a conventional arc welder: A control power supply unit 11 for transforming and supplying a 220v input into a power supply for signal processing and a high frequency oscillation power as a small transformer; A high frequency oscillation power rectifier 12 for receiving a voltage from the control power supply 11 to rectify the high frequency oscillation power; A high frequency processing unit receiving the high frequency oscillation power rectified from the high frequency oscillation power rectifying unit 12 to oscillate at a high frequency, amplify and then boost the high voltage to induce a high frequency in a concentric reactor; A welding start signal unit 21 for providing a welding start signal that is an arc start signal by a power signal obtained from the control power supply unit 11; A welding power source control contactor (24) connected to the welding power source (-) input terminal (1) and controlling power on / off of the welding power source of the arc welding machine according to the presence or absence of welding; When the welding power control magnetic contactor 24 is turned on, the input voltage of the welding power source (-) input terminal 1 and the welding power source (-) input terminal 2 is detected, and the type of the welding power source is alternating current. A welding voltage detection unit 23 for recognizing a direct current and no welding when the welder voltage value is above a predetermined value and recognizing a welding state when the welding machine voltage value is below a predetermined value; When the welding start signal is input from the welding start signal unit 21 to operate the electromagnetic contactor 24 for controlling the welding power, and a high frequency is induced in the high frequency induction part while the argon gas is supplied between the welding torch and the base material, the torch The insulation between the substrate and the base material is destroyed, so that a primary arc is generated and a welding current is formed secondly. As a result, a welding voltage is rapidly dropped by the load current, the signal is recognized from the welding voltage detection unit 23 to receive a welding state. A sequence controller 22 for cutting off the high frequency oscillation power sent through the controller or weakly adjusting the oscillation intensity; A crater use setting unit (31) connected to the sequence control unit (22) and providing a crater process switching signal according to the crater use setting; A welding gas supply time setting unit 41 connected to the sequence control unit 22 and setting a supply time of a welding gas; A welding torch cooling control unit (51) for cooling the heat generated by the welding torch by driving the connected welding torch cooling unit when being welded by the signal processing unit of the sequence control unit (22); A welding gas supply / blocking control unit 42 for supplying a welding gas by the arc start signal and cutting off the gas after a predetermined time delay by the arc stop and the gas delay set value by the welding end signal; And An electronic TIG welding auxiliary device, comprising: a welding current setting and a crater setting unit 32 for converting a welding current to a crater setting current value according to the crater switching signal of the welder during welding. The method of claim 1, The high frequency processing unit A high frequency control unit 25 which receives the high frequency oscillation power rectified from the high frequency oscillation power rectifier 12 and controls oscillation at high frequency; A high frequency oscillation amplification unit 14 including a high frequency oscillation unit and a high frequency oscillation amplifier for high frequency oscillation, and oscillating at high frequency for initial arc activation using an electronic vibration circuit; A high frequency high voltage transformer 15 for boosting the electric potential oscillated at a high frequency from the high frequency oscillation amplifier 14 to a high voltage potential by a high voltage transformer; And Electromagnetic TIG welding auxiliary device comprising a high frequency induction part (16) for inducing arc generation by receiving a high voltage potential boosted from the high frequency high voltage transformer (15) to induce a high frequency in the reactor. delete delete The method of claim 1, The welding current setting and crater setting unit 52 It includes a crater control function that sets the current set value using the circuit connected to the a contact of the relay, switches to the b contact, sets the volume value to be connected as the crater current, and enables the final welding according to the set current value. Electronic TIG welding auxiliary control device. The method of claim 1, The cooling device control unit 51 for cooling the welding torch is When the contact point of b contact of WCR, that is, WCR OFF due to the decrease of welding voltage due to arc generation and the contact of b contact and ON of arc start relay, which are turned on by the operation of the cooling device driving control unit, operate the cooling device, coolant pump motor and coolant An electronic TIG welding auxiliary control apparatus comprising a small cooling device for driving a radiator and a cooling fan motor to cool the coolant heated by the heat generated by the welding torch.