KR101257026B1 - Co2 welding machine - Google Patents

Abstract

PURPOSE: A CO2 welding equipment is provided to be equipped with a sensor unit capable for a CO2 gas pressure or a flow rate during a CO2 welding work, thereby interrupting the wire supply when the decline in CO2 gas pressure or the flow rate occurs. CONSTITUTION: A CO2 welding equipment includes a welder body(10), a CO2 gas cylinder(11), a wire drum(12), a wire feeder(13) and a welding torch(14). A sensor(22) is installed on a gas line extended from a CO2 gas cylinder(11) to detect the pressure or the flow rate of the CO2 gas flowing in the gas line. The sensor and a control unit(23) of the wire feeder are connected electrically with each other to provide a detected signal by the sensor to the control unit. The control unit cuts the power supply to the wire feeder based on the detected signal provided by the sensor when the pressure of the CO2 gas or the flow decreases below a standard value, thereby automatically stopping the wire supply.

Description

CO2 welding machine {CO2 welding machine}

The present invention relates to a CO2 welding facility, and more particularly, to a welding facility for joining two metals using CO2 as a protective gas and using an electric arc and heat generated between the electrode and the surface of the base material.

In general, CO2 welding is a method of welding inert gas CO2 as a protective gas and using the discharge phenomenon between the wire and the base metal. CO2 gas is supplied through a gas nozzle to automatically protect arcs and molten metal from the atmosphere, and is automatically supplied. When the wire passes through the contact tip, the welding current is welded using arc heat generated between the energized wire and the base metal.

This CO2 welding increases the amount of slag produced, improves the appearance of the beads, increases the temperature of the molten pool, and improves the ductility and impact value of the welded steel, resulting in improved ductility and impact value. It is widely used for high efficiency welding of sheet metal, including rear axle, mass production of housing, vehicle civil machinery, and pipe making.

Usually, a facility for welding CO2 is composed of a power supply unit for supplying power, a gas supply unit for supplying gas, a wire supply unit for continuously supplying a welding wire, a welding torch unit for welding the welded object, and the like.

For example, as shown in FIG. 1, the CO2 welding facility includes a welder body 10 for power supply, a CO2 gas cylinder 11 for supply of CO2 gas, a wire drum 12 for wire supply, and the like. A wire feeder 13, a welding torch 14 for performing welding to the base material, and the welding torch 14 is connected to the gas hose 15 and the welding cable 16 and at the same time the wire 17 ) Is fed, and the ground cable 18 is connected between the welder body 10 and the base material.

Here, reference numerals 19 and 20 denote pressure regulators and flow meters, respectively.

Therefore, the wire 17 wound on the wire drum 12 is continuously fed to the welding torch 14 by the wire feeder 13, while the power is supplied to the welding torch 14 to be connected to the base metal. An arc is generated in the arc, and welding is performed while the base metal and the wire are melted in a state where the arc and the surroundings of the welding region are blocked by CO 2 gas.

In such CO2 welding, the matching state between the wire and the welded part, the feeding speed of the wire, proper current and voltage adjustment have an important influence on the welding quality.

For example, the following factors affect the welding quality during CO2 welding.

1) If the wire diameter is large, it will increase sputter, arc instability and decrease penetration depth.

2) If the flow rate of CO2 gas is small or the wind is strong, pores are generated, and the arc state, bead shape, and fusion metal properties vary depending on the type of shield gas.

3) Pore occurs when oil and rust adhere to the surface of the base material.

4) Increasing the distance between the welding tip and the base material, the current decreases, the depth of penetration also changes, and the beads tend to be undulating.

5) If the arc length is large (high voltage), the bead becomes wider, the depth of penetration decreases, and the sputter size increases.

6) Increasing the wire length increases the arc instability and sputter, decreases the depth of penetration as well as decreases the shielding effect, causing pores and increasing the melt rate.

7) As the penetration current increases, the width and penetration depth of the beads increase, the sputter size and amount decrease, and the shape of the beads becomes rough.

8) When the torch angle decreases, the bead becomes wider, the penetration depth increases, and pores occur.

In particular, since the welding is performed even without the CO2 gas due to the characteristics of the CO2 welding, oxidation, bubbles, and pores of the welding part are generated, which greatly affects the welding quality. Consequently, welding is performed in a state in which the CO2 gas is not properly supplied. Due to this continuity, there are problems such as poor welding quality and product defects, as well as waste of material and reduced productivity.

Accordingly, the present invention has been made in view of the above, and provided with a sensor means capable of detecting the pressure, flow rate, etc. of the CO 2 gas at the time of CO 2 welding, when the pressure or flow rate of the CO 2 gas is reduced By implementing a new type of welding method that automatically stops supply and prevents welding, it can reduce welding quality defects and increase the efficiency of the overall welding operation by allowing the user to identify the cause and take action. The purpose is to provide a CO2 welding facility.

CO2 welding facilities provided by the present invention to achieve the above object has the following features.

The CO2 welding facility includes a welder body for supplying power, a CO2 gas cylinder for supplying CO2 gas, a wire drum and wire feeder for wire supply, and a welding torch for welding the base metal. As a gas line extending from the CO2 gas cylinder, a sensor is installed to detect the pressure and / or flow rate of the CO2 gas flowing through the line, and the control unit of the sensor and the wire feeder are electrically connected to each other so that the sensor detection signal is controlled. The control unit may be configured to cut off the power of the wire feeder when the pressure and / or flow rate of the CO 2 gas drops below the reference value based on the detection signal provided from the sensor.

Therefore, the CO2 welding facility is characterized in that the welding quality is not stopped while welding of the wire is automatically stopped when there is a decrease in the pressure and / or flow rate of the CO2 gas, thereby reducing a poor welding quality or a welding defect.

Here, the CO2 welding facility may be formed in a form that may include both a pressure sensor for detecting the pressure of the CO2 gas or a flow sensor for detecting the flow rate of the CO2 gas, or both the pressure sensor and the flow sensor.

The CO2 welding facility is equipped with a pressure regulator having an input port connected to the discharge side of the CO2 gas cylinder, a flow meter having an output port connected to the gas hose side extending to the welding torch side, and mounted on a gas line between the pressure regulator and the flow meter. It is preferable to further include a CO 2 regulator configured by combining a sensor for detecting the pressure and / or flow rate of the O 2 gas in the form of an assembly.

The CO2 welding facility provided by the present invention detects this when the pressure and / or flow rate of the CO2 gas is reduced in the process of CO2 welding, and turns off the power of the wire feeder using the sensor detection signal at this time, thereby reducing the CO2 gas. The welding can be prevented in advance without the supply of.

Therefore, it is possible to reduce not only welding quality defects but also welding defects of the product, to prevent productivity degradation related to reworking, and to allow users to identify the cause and take measures. There is an effect to improve.

1 is a schematic view showing a conventional CO 2 welding facility
Figure 2 is a schematic diagram showing a CO2 welding facility according to an embodiment of the present invention
Figure 3 is a perspective view showing a CO2 regulator in a CO2 welding facility according to an embodiment of the present invention
Figure 4 is a schematic diagram showing a state of use of the CO2 welding equipment according to an embodiment of the present invention

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

Figure 2 is a schematic diagram showing a CO2 welding facility according to an embodiment of the present invention.

As shown in FIG. 2, the CO2 welding facility detects that the pressure of the CO2 gas drops or stops the supply of the CO2 gas during the CO2 welding, so that the supply of the wire is stopped and the welding is stopped in the absence of the CO2 gas. It is made in a form that can reduce the welding failure by not made.

To this end, the welding machine main body 10 for managing the overall welding progress, such as supply of power, the CO2 gas cylinder 11 for supplying CO2 gas for cutting off the arc and the welded area, and substantially performing welding work on the base metal A welding torch 14 is provided.

The welder main body 10 is provided with a welding cable 16 and a grounding cable 18, wherein the welding cable 16 is connected to the welding torch 14 side to supply power to the tip of the welding torch 14. The ground cable 18 is connected to the base material side.

In addition, the gas hose 15 is extended to the discharge side of the CO2 gas cylinder 11, the gas hose 15 is extended to the welding torch 14 side can be supplied to the CO2 gas around the arc and the molten portion. Will be.

The welding torch 14 has a hand grip (not shown), a switch (not shown) for controlling welding start stop, an insulator (not shown) for insulation of the welding torch, and a gas deep gas pump. It can be made of a conventional structure including a jersey (not shown), a contact tip (not shown) for transmitting a current to the wire.

Of course, a welding cable for transmitting a welding current, a gas hose through which CO 2 gas can pass, etc. are disposed inside the welding torch 14, and a control line (not shown) for controlling a welding start signal. Spring liners (not shown) through which wires can pass are provided.

The wire feeder 12 continuously transfers the wire drum 12 on which a certain amount of wire is wound and the wire 17 released from the wire drum 12 to the welding torch 14 as a means for supplying the wire. 13 is provided, the wire feeder 13 at this time has a built-in motor (not shown), etc. for wire transfer, and can be controlled by receiving power from the welder body (10).

In particular, a sensor 22 is provided in the gas line 21 extending from the CO 2 gas cylinder 11 and provided with means for detecting the pressure, flow rate, or both of the CO 2 gas flowing through the line.

Here, the sensor 22 may be made of a pressure sensor for detecting the pressure of the CO2 gas, a flow sensor for detecting the flow rate of the CO2 gas, and is connected between the CO2 gas cylinder 11 and the welding torch 14. It can be installed in a suitable position of the gas hose 15, for example, the gas piping side position of the CO2 regulator 26 mentioned later.

As an application example of such a sensor 22, a pressure sensor may be installed on the gas pipe side of the CO2 regulator 26, or a flow sensor may be used, or both a pressure sensor and a flow sensor may be installed and used. .

At this time, the pressure sensor or the flow rate sensor may be applied to those used in a conventional gas line.

In addition, the sensor 22 side and the wire feeder 13 side are electrically connected to each other by the sensor cable 27, so that the power of the wire feeder 13 may be cut off by a signal detected by the sensor 22. It becomes possible.

As an example, the wire feeder 13 is provided with a control unit 23 for controlling the feeder ON / OFF, etc., the control unit 23 at this time based on the detection signal received from the sensor 22 That is, the sensor detection value and the preset reference value are compared, and when the pressure and / or flow rate of the CO 2 gas drops below the reference value, the wire feeder 13 serves to cut off the power supply.

That is, when the pressure and / or flow rate of the CO 2 gas supplied to the welding torch 14 falls below the reference value, the power of the wire feeder 13 is cut off by the control of the controller 23, and thus the supply of the wire is stopped. As a result, no further welding work is performed.

At this time, the pressure reference value of the CO 2 gas for stopping the operation of the wire feeder 13 is preferably set to about 0.2 to 0.3 MPa, but if it is higher or lower than this, welding quality may occur.

And, the reference value of the flow rate of the CO 2 gas for the operation stop of the wire feeder 13 is preferably set to 10 to 20 l / min, preferably 15 l / min, the flow rate at this time is the actual CO 2 gas The flow rate can be checked, which can be used by setting the flow rate to be 1.5M / sec or less at the arc part (torch end) during welding.

Of course, the control unit 23 may be provided in the welder main body 10 to allow the welder main body 10 to control the power OFF of the wire feeder 13 when a sensor signal is input.

In addition, the pressure regulator 19 and the flow meter 20 are located at one side of the gas hose 15 connected between the CO 2 gas cylinder 11 and the welding torch 14, for example, adjacent to the CO 2 gas cylinder discharge side. The pressure and the flow rate of the CO 2 gas supplied to the welding torch 14 by the pressure regulator 19 and the flow meter 20 at this time can be adjusted appropriately.

Therefore, when the pressure and / or flow rate of the CO 2 gas is lowered due to an abnormality of the line to which the CO 2 gas is supplied, the supply of the wire is stopped while the power of the wire feeder 13 is cut off, and thus, the CO 2 gas is not present. Welding is not done.

Figure 3 is a perspective view showing a CO2 regulator in a CO2 welding facility according to an embodiment of the present invention.

As shown in FIG. 3, here is an example of a sensor 22 for sensing the pressure of the CO 2 gas, ie, a CO 2 regulator 26 in which the pressure sensor, the pressure regulator 19 and the flow meter 20 are combined in one assembly form. Shows.

That is, it has a pressure regulator 19 having an input port 24 connected to the discharge side of the CO2 gas cylinder 11 and an output port 25 connected to the gas hose 15 side extending to the welding torch 14 side. The flow meter 20 is provided, and the pressure regulator 19 and the flow meter 20 are connected to each other by a gas line 21, for example, a gas pipe such as a "T" -shaped nipple.

In addition, the gas pipe is provided with a sensor 22 for detecting the pressure of the CO2 gas.

Accordingly, the CO 2 gas discharged from the CO 2 gas cylinder 11 is supplied to the welding torch 14 side through the pressure regulator 19 and the flow meter 20, and the pressure of the CO 2 gas supplied in this way is the pressure regulator 19. The sensor 22 between the flowmeter and the flowmeter 20 can be detected, and the detected pressure value is sent to the control unit 23 in the wire feeder 13.

Here, the pressure regulator 19 may be composed of a pressure adjusting knob (19a) that is a means for the user to operate the pressure setting, and a pressure gauge (19b) that can represent the pressure set by the operation at this time, In addition, the flow meter 20 may also be composed of a flow rate adjustment knob 20a which is a means for the user to operate the flow rate setting, and a flow rate indicator 20b which can indicate the flow rate set by the operation at this time.

Thus, the sensor 22 for detecting the pressure of the CO2 gas, the pressure regulator 19 for the pressure adjustment and the flow rate adjustment, and the flow meter 20 are provided in the form of an assembly to combine the CO2 regulator 26, such as installation or operation It is easy to handle and has advantages in maintenance.

Therefore, looking at the state of use of the CO2 welding equipment is configured as follows.

Figure 4 is a schematic diagram showing a state of use of the CO2 welding equipment according to an embodiment of the present invention.

As shown in FIG. 4, with the operation of the welder body 10, the CO 2 gas supplied from the CO 2 gas cylinder 11 is sent to the welding torch 14 through the gas hose 15 and sprayed from the nozzle at the end of the torch. The surroundings of the arc and the molten portion between the contact tip and the base material 100 is blocked, and at the same time, the wire 17 supplied from the wire feeder 13 passes through a spring liner in the torch and through the contact tip at the end of the torch. As it is provided until the welding is made.

In addition, the pressure and / or flow rate of the CO 2 gas is detected in real time by the sensor 22 in the state where welding is normally performed as described above, and the detection signal of the sensor 22 at this time is controlled by the control unit in the wire feeder 13. Continued to 23).

On the other hand, the pressure and / or flow rate of the CO2 gas is reduced due to an abnormality of the CO gas supply line, for example, leakage of CO2 gas, malfunction of a pressure regulator or flow meter, exhaustion of CO2 gas in the CO2 gas cylinder, or When the supply is cut off, the sensor 22 then detects the pressure and / or flow rate on the gas line and sends the signal to the controller 23.

Subsequently, the control unit 23 compares the CO 2 gas pressure value and / or flow rate value received from the sensor 22 with the preset pressure and / or flow rate of the CO 2 gas, and as a result, the CO 2 gas pressure. And / or when the flow rate falls below the reference value, the power of the wire feeder 13 is cut off.

Therefore, when the pressure and / or flow rate of the CO 2 gas drops or is interrupted, supply of the wire is automatically stopped at the same time as the power supply of the wire feeder 13 is turned off, so that welding is no longer performed in the absence of the supply of CO 2 gas. do.

And, the user can determine the cause and take action when the welding stops.

As such, in the present invention, by placing a sensor for detecting the pressure, flow rate, etc. of the CO2 gas by detecting a pressure, flow rate drop, and using this as a means to cut off the power of the wire feeder by adopting a welding method to stop the wire supply In the absence of CO2 gas, welding is not performed, and thus, welding defects can be reduced, and there is an advantage in that the cause can be quickly identified and follow-up can be quickly performed.

10: welder body 11: CO2 gas cylinder
12: wire drum 13: wire feeder
14: welding torch 15: gas hose
16: welding cable 17: wire
18: ground cable 19: pressure regulator
19a: pressure adjustment knob 19b: pressure gauge
20: flow meter 20a: flow control knob
20b: flow meter 21: gas line
22: sensor 23: control unit
24: input port 25: output port
26: CO2 regulator 27: sensor cable

Claims (3)

Welder body 10 for power supply, CO2 gas cylinder 11 for supply of CO2 gas, wire drum 12 and wire feeder 13 for wire supply, and welding to the base material A facility comprising a welding torch 14 for
The gas line 21 extending from the CO2 gas cylinder 11 is provided with a sensor 22 that detects the pressure or flow rate of the CO2 gas flowing through the line, and controls the sensor 22 and the wire feeder 13. 23 are electrically connected to each other so that a sensor detection signal is provided to the control unit 23, and the control unit 23 is based on a detection signal provided from the sensor 22 when the pressure or flow rate of the CO 2 gas falls below a reference value. By shutting off the power supply of the wire feeder 13, supply of wire is automatically stopped when there exists a fall of the pressure or flow volume of CO2 gas,
The sensor 22 is a pressure sensor for detecting the pressure of the CO 2 gas or a flow rate sensor for detecting the flow rate of the CO 2 gas, the pressure reference value of the CO 2 gas for stopping the operation of the wire feeder 13 ranges from 0.2 to 0.3 MPa The flow rate reference value of the CO 2 gas is in the range of 10 to 20 l / min,
It has a pressure regulator 19 having an input port 24 connected to the discharge side of the CO2 gas cylinder 11, and an output port 25 connected to the gas hose 15 side extending to the welding torch 14 side. CO2 regulator is formed by combining the flow meter 20, the sensor 22 mounted on the gas line 21 between the pressure regulator 19 and the flow meter 20 to detect the pressure or flow rate of the CO2 gas in an assembly form ( CO 2 welding equipment further comprises.


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