KR100643848B1 - Electrogas Welding Apparatus and Controlling Method - Google Patents

Abstract

The present invention relates to a digital communication type electrogas welding apparatus having a main sub-structure and a control method thereof, which separates one control unit into a main unit 1 and a sub unit 2, and interlocks each other by digital communication. As a result, it is possible to maintain a high quality welding operation including an algorithm of the arc state determination function as well as weight reduction of the carriage 10 and distribution of arithmetic functions.

Description

Digital Communication Electrogas Welding Device of Main-Sub Structure and Its Control Method {Electrogas Welding Apparatus and Controlling Method}

1 is a schematic configuration diagram of an EGW apparatus according to the present invention.

2 is an exemplary view of a main unit mounted to a carriage of an EGW apparatus according to the present invention.

3 is an input / output relationship diagram of the EGW apparatus according to the present invention.

4 is an algorithm of the arc state determination function of the EGW apparatus according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital communication type Electrogas Welding (EGW) device having a main-sub structure and a control method thereof, and more particularly to a carriage using digital communication between a main part and a sub part. In addition to reducing weight and reducing the number of cables, the main unit is equipped with a means for displaying the current working arc status so that the welding worker can check the arc status during the work and judge whether the welding is normal and reflect the work in real time. The present invention relates to an EGW apparatus and a control method thereof capable of maintaining high quality welding work.

In general, EGW surrounds the gap of the base metal to be welded with a water-cooled copper wall, shields the molten pool with a gas such as carbon dioxide, and then continuously feeds the wire to the molten part to generate an arc. A welding process in which the wire and the base are melted and joined together by heat, which is applied when the welding line is almost vertical and welds in a gas atmosphere from bottom to top.

As an apparatus for performing such EGW, there is an automatic welding device having a carriage which measures the current used for actual welding with a sensor and uses this measured value as traveling control information.

This automatic welding device performs traveling control by measuring the change in the actual welding current according to the change in length from the electrode end of the torch to the arc of the protruding welding wire. The length from the electrode end of the torch to the arc of the protruding welding wire is kept constant by the initially set welding current and voltage. However, as the welding proceeds, when the molten pool is filled up, the distance from the electrode tip to the arc becomes shorter, and thus the resistance decreases, thereby increasing the welding current output. .

However, even in the case of welding by an unskilled worker with such an automatic welding device, there is a lack of experience in the normal arc state, and even though it is an inappropriate welding condition, welding is often continued using such a condition. There was a problem.

In addition, in the automatic welding apparatus, the control unit is located only in the carriage, so that a plurality of cables for various analog control signals are required, which makes the weight of the carriage unnecessarily heavy, while the connection distance (ie, the length of the cable) is increased. In case of a long distance, when the analog control signal is transmitted, the level of the signal is attenuated.

Accordingly, the present invention has been made to solve the above problems, by separating one control unit into a main unit and a sub unit, and by interworking between the main unit and the sub unit by digital communication, to reduce the number of types of cables required It is possible to provide an EGW device capable of preventing attenuation of signal levels generated from analog control signals during remote transmission.

In addition, another object of the present invention is to separate the control unit into a main part and a sub part, and to install the means for displaying the current arc state in the main part, an operator who welds to check the arc state during operation and normal welding It is to provide an EGW device that can maintain the high quality welding work by determining whether or not to reflect in the work in real time.

It is still another object of the present invention to separate a control unit into a main unit and a sub unit, to enable distribution of arithmetic loads and simplify circuit design, and to reduce the carriage weight, respectively. The purpose is to provide an EGW device in which a separate microprocessor is built in, and the computing power is increased to cope with the addition of an algorithm for determining the arc state.

In addition, another object of the present invention is to provide a control method of an EGW apparatus according to the present invention.

The present invention for achieving the above object is described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of an EGW device according to the present invention. The overall configuration of the EGW device according to the present invention is largely provided with a main part 1 mounted on the carriage 10 and a sub-part provided separately from the main part. The unit 2 includes a power source 20, a cooling water cooler 30, a supplying device 40 for shielding gas such as carbon dioxide, and a wire feeder 50.

The power source 20 supplies the power required for welding, the water cooler 30 cools the torch from the high heat generated during welding, and supplies the cooling water required to form the welding bead using copper sugar, In the shielding gas supply device 40, a shielding gas such as carbon dioxide is supplied to block the molten material from the air to ensure welding quality. In addition, the wire feeder 50 is to supply the welding wire required for welding to the welding portion. Since the structure and operation of these parts 20, 30, 40, 50 are already well known in the art, a detailed description thereof is omitted here.

In addition, the carriage 10 is mounted to the rail member 11 and has a drive motor for automatically traveling along the rail member 11. In addition, the carriage 10 includes a welding torch and the torch. A torch support mechanism for supporting a predetermined posture, a copper support portion, and a support mechanism for supporting the copper support portion are provided. Since these structures and operations are already well known in the art, detailed descriptions thereof are omitted here.

In the prior art, it is provided with a control unit which is usually installed as one, in the present invention, the main unit (1) and the sub-unit (2) is separated, and it is characterized in that the interlocking between them by digital communication such as RS422 bidirectional communication, for example. Since it is, it will be described in detail.

2 is an exemplary diagram of a main part mounted on a carriage of an EGW device according to the present invention, which is provided with a control panel and a microprocessor capable of inputting and displaying various set values, and in particular, an arc state. Visual means such as for example LED lamps 3 are provided. The main unit 1 performs driving control and weaving control related to initial setting of welding conditions and driving of the carriage 10 by inputting a set value of the operator, and real time welding measured by the sub unit 2 to be described below. Welding is performed by receiving current, voltage and arc state through digital communication such as RS422 bidirectional communication.

The driving control of the carriage 10 of the EGW device according to the present invention is similar to the above-described automatic welding device, and is measured by the change in the actual welding current according to the change in the length from the electrode end of the torch to the arc of the welding wire protruding. Control will be performed.

In addition, the measured welding current and voltage are displayed digitally in the main part (1).

In addition, as will be described below, the information received from the sub-unit 2 includes information on the arc state, and the microprocessor embedded in the main unit 1 determines this information, so that the LED lamp 3 Controls to display that information. In the example of FIG. 2, the LED lamp 3 provided in the main part 1 displays the arc state in three stages of "normal", "check" and "above", so that the operator can easily recognize the welding state. It is. Meanwhile, although the LED lamp 3 is used here as a means for displaying the arc state, the present invention is not limited thereto, and other visual means may be used as well as an audible means for generating a differentiated sound.

The sub-unit 2 is also equipped with a microprocessor, for example, the sensing of the welding current and voltage using a hall sensor, arc sensing, arc state determination calculation, sensing information processing and information transmission, control of the welding power source, etc. Act as a separate control to implement. The welding power supply control information input from the main unit 1 and the arc sensing information measured from the sub unit 2 are shared with each other using digital communication such as, for example, RS422 bidirectional communication.

As described above, the input / output relationship related to the control of the EGW apparatus according to the present invention is well illustrated in FIG. 3.

Further, in the algorithm of the arc state determination function shown in Fig. 4, the welding quality is judged whether or not the current value measured with respect to the current value initially set by the operator is out of the allowable range. That is, during normal welding, the welding current is distributed within a certain range of the initially set current value. If the welding current becomes unstable due to the intervention of other inappropriate welding variables, the measured current value is out of the set current value range. . Information related to the determination of this arc state is transmitted to the main unit 1 via digital communication such as, for example, RS422 bidirectional communication, so that the arc states are shown as " normal ", " check " It is to be able to inform the operator to the LED lamp (3) that is displayed as "ideal."

Thus, if one control unit is divided into the main unit 1 and the sub unit 2 as in the present invention, the EGW device has various advantages. In the configuration of the entire system, the carriage 10 is a power source 20. ), The water cooler 30, the shielding gas supply device 40 and the like has a distance of about 50m actually. Therefore, when the control unit is located only in the carriage main body as in the prior art, lines (welding current, voltage, inching, start and stop, etc.) for various analog control signals are required. By interworking with digital communication, the number of cables required can be reduced and the attenuation of signal levels generated from analog control signals during long distance transmission can be prevented. In addition, by separating the functions, it is possible to distribute the computational load and simplify the circuit design, thereby reducing the weight of the carriage 10. Since separate microprocessors are built into the main unit 1 and the sub unit 2, the computing power is increased, so that it is possible to easily cope with adding an algorithm of the arc state determination function, and to display the arc state. By providing the means to indicate the optimum welding arc condition to the operator, even in the case of unskilled people can obtain a good welding quality.

Now, the operation of the EGW apparatus according to the present invention will be described.

As described above, the rail member 11 and the carriage 10, the power source 20, the cooling water cooler 30, the supplying device 40 for shielding gas such as carbon dioxide, the wire feeder 50, and the like. After moving the configured EGW device to the work site, various cables are laid out (within 50m) to the welding point. And a backing material is provided in a welding part. After moving the rail member 11 and the carriage 10 and the wire feeder 50 to the welding place, the rail member 11 is installed and then the carriage 10 is installed, and various cables are connected to the corresponding parts for welding. After entering the set value of the condition, perform welding.

Looking at the control method at the time of welding, when the welding start command is first input to the main part 1 of the carriage 10, for example, the welding condition and the start command set in the sub part 2 by digital communication such as RS422 bidirectional communication, etc. The sub unit 2 transmits the information to the power source 20 again. Next, the power source 20 supplies welding power through the power supply line according to the welding conditions initially set in the main unit 1, and supplies power for wire feeding to the wire feeder 50. At this time, the sub part 2 detects the actual welding current and measures the voltage by a sensor such as, for example, a hall sensor in the output power terminal of the power source 20. This information is first processed (e.g. noise reduction, filtering, etc.) in the sub-unit 2, transmitted to the main unit 1 via digital communication, such as the RS422 bidirectional communication, and then displayed and travel control, arc state. Used for judgment function. On the other hand, the carriage 10 generates an arc using the welding power supplied from the power source 20 as a welding torch mounted thereto, and melts the arc of the welding wire continuously supplied from the wire feeder 50.

The operator refers to the information (actually measured welding current and voltage) displayed digitally in the main part 1 of the carriage 10 and the LED lamp 3 which simply displays the arc state, and welds in real time if necessary. The condition can be modified, which is also transmitted to the sub-unit 2 via digital communication and then to the power source 20 to adjust the welding power of the power source 20.

As described above, according to the present invention, the control unit of the EGW device can be divided into a main unit and a sub unit, which enables distribution of computational loads and simplification of circuit design, thereby making it possible to reduce the carriage weight and between the main unit and the sub unit. By interworking with digital communication, the number of types of cables required can be reduced.

In addition, by installing a lamp indicating the current arc state in the main part, the welding worker can check the arc state during the operation to determine whether the welding is normal and reflect it in real time work, high-quality welding work To maintain the effect.

Claims (5)

Carriage 10 mounted on the rail member 11 to automatically run along the rail member 11, a power source 20 for supplying power for welding, and cooling water for supplying cooling water for welding Cooler 30, the shielding gas supply device 40, such as carbon dioxide, the wire feeder 50 for supplying the welding wire required for welding to the welding portion, and these components (10, 20, 30, 40, 50) to control The main part 1 and the sub part 2 each having a separate microprocessor embedded therein, and the main part 1 and the sub part 2 interlocked by digital communication to share information with each other. In the electrogas welding apparatus having a, And the control unit further comprises means for visually or audibly displaying the arc state in real time. delete Electrogas welding, each having a main part 1 and a sub part 2 in which individual microprocessors are built-in, and the main part 1 and the sub part 2 interlocked by digital communication to share information with each other. On the device, Inputting a set value of a welding condition and a start command to the main part (1); Sending information, such as a welding condition and a start command, set in the main unit (1) to the sub unit (2) through the digital communication; The sub portion (2) transferring the information to a power source (20); Supplying power by the power source 20 according to the set welding condition; Detecting a welding current and measuring a voltage by a sensor at a power terminal of the power source 20 in the sub-part 2; Transferring the measured information from the sub-unit (2) to the main unit (1) by digital communication; This information is displayed on the main unit (1), and used for driving control, arc state determination function, and the like. 4. The control method according to claim 3, wherein the arc state determination function determines whether or not the measured current value with respect to the initially set current value is out of an allowable range. 5. The control method of an electrogas welding apparatus according to claim 4, further comprising the step of visually or audibly displaying information related to the determination of the arc state to inform an operator.

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