KR101271872B1 - Tandem electro gas arc welder and stick-out control method for it - Google Patents

Abstract

The present invention is to solve the above problems, it is an object to remove the poor penetration caused by the molten metal is not filled, in order to achieve this, the present invention is a torch for the electrode wire is equipped with an electrode wire at the tip A tandem electro gas arc welding device comprising two or more, and melting an arc furnace electrode wire generated by the electrode wire, wherein one torch for one electrode wire is capable of relative movement in the vertical direction with respect to the torch for another electrode wire. Stick-out of a tandem electro gas arc welding device comprising a drive means for moving only the torch for electrode wires and a tandem electro gas arc welding device for welding with an arc generated from the electrode wire with a torch for two or more electrode wires at which the electrode wire is mounted at the tip. to control the stick-out, Charge determination step of determining whether the charging wire torch side of the molten metal for at least a predetermined level; Provided is a stick-out control method of a tandem electro gas arc welding apparatus including a raising step of raising a torch for electrode wires determined to be charged in the determining step.

Description

TANDEM ELECTRO GAS ARC WELDER AND STICK-OUT CONTROL METHOD FOR IT}

The present invention relates to a tandem electro gas arc welding apparatus and a stick out control method thereof, and more particularly, to a tandem electro gas arc welding apparatus and a stick out control method thereof capable of preventing poor penetration.

Electro gas arc welding is a welding method that has been developed and applied to increase the welding productivity of thick plates required in shipbuilding. Recently, a tandem electro gas arc welding method using a torch for two or more electrode wires has been developed.

In the case of such tandem electro-gas arc welding, it includes a current sensor for measuring the current flowing to either side of the torch for two electrode wires, the molten metal when the current value measured by the current sensor is more than a predetermined set value It is judged that it is charged to this target level, and the torch for two electrode wires is raised together by a predetermined distance, for example, 5 mm, and this is called stick out control.

1 shows a schematic diagram of such an electrogas arc welding device. Electro gas arc welding mainly uses carbon dioxide 60 as a protective gas, generates an arc by the electrode wires W1 and W2 supplied to the torch 10 and 20 for electrode wires, and the arc heat torch for the electrode wires. The welding is performed by melting the electrode wires W1 and W2 of (10, 20).

An arc generated between the electrode wires W1 and W2 and the welded material 30 provided with the water-cooled copper immersion 40 on the front surface of the weldable material 30 and a fixed backing material 50 on the back surface. By melting the electrode wire (W1) to form a molten metal 32, when a predetermined amount of molten metal is formed, the torch for the electrode wire (10, 20) is mounted, and is fixed to the support to be movable in the vertical direction The torch 10 or 20 for electrode wires is raised by a predetermined distance through the driving means 81 of the welding carriage body 80.

In addition, the welding carriage main body 80 oscillates the torch 10 and 20 for the electrode wire so that the molten metal is evenly filled on the root and face side. The electrode wires W1 and W2 of the torch 10 for electrode wires are supplied from the electrode wire supply means 91 and 92 through the welding carriage main body 80, and the power is supplied from the power supply unit 93 to the electrode wires W1 and W2. Is supplied.

In addition, a current sensor 95 is mounted on the one-side electrode wire W2 side power supply unit in the power supply unit 93 to measure a current value flowing through the electrode wire W2. In addition, the controller 90 is connected to the power supply unit 93 and the driving means 81 of the welding carriage main body 80 to perform a stick out control for raising the welding carriage main body 80 when the filling is at a predetermined level.

However, as shown in FIG. 2, even when the electrode wire torch 10 on the root side and the electrode wire torch 20 on the face side are oscillated together, the side that is not measured when only current is measured on one side is measured. A space 5 free of molten metal may occur. That is, even though the molten metal is not filled on the unmeasured side, it rises together with the torch for the other electrode wire, thereby creating a space 5 in which the molten metal is not filled. Such a space 5 must be avoided to significantly reduce not only the weld completeness but also the performance of the weldment.

The present invention is to solve the above problems, it is an object to remove the poor penetration caused by the molten metal is not filled.

It is also an object of the present invention to adjust the molten metal filling on both sides through stick out control.

The present invention provides a tandem electro gas arc welding apparatus and a stick out control method of the tandem electro gas arc welding apparatus in order to achieve the above object.

The present invention includes two or more torch for electrode wire to which the electrode wire is mounted at the tip, and a tandem electro gas arc welding device for melting the arc furnace electrode wire generated by the electrode wire, the electrode for the one electrode wire is different Provided is a tandem electro gas arc welding apparatus comprising drive means for moving only one torch for an electrode wire so as to allow a relative movement in the vertical direction with respect to the wire torch.

In the present invention, the drive means is provided in the torch for each electrode wire, the torch-side molten metal for one electrode wire is filled to a predetermined level or more, and includes a control unit connected to the drive means to raise the torch for the electrode wire can do.

In addition, the present invention measures an individual current value flowing through the electrode wire, and further comprises a current measuring unit connected to the control unit, wherein the control unit for the individual electrode wires whether the measured current value exceeds a predetermined set value; Whether the torch side molten metal is filled or not can be determined.

The electrode wire torch may include a torch for the root electrode wire and a torch for the face electrode wire, and may include lifting means for moving both the torch for the root electrode wire and the torch for the face electrode wire together.

Further, the tandem electro gas arc welding apparatus of the present invention supplies electrode wires to the torch for the root and face electrode wires, respectively, and is connected to a control unit, and includes a wire supply unit for controlling the feeding amount of the electrode wires, When only one of the torch for the root and the face electrode wire is raised, it is possible to reduce the feeding amount of the electrode wire.

On the other hand, the present invention is a method for controlling the stick-out of the tandem electro gas arc welding apparatus for welding with an arc generated from the electrode wire with a torch for two or more electrode wires, the electrode wire is mounted on the tip, for each electrode wire A charging determination step of determining whether or not the torch-side molten metal is filled above a predetermined level; Provided is a stick-out control method of a tandem electro gas arc welding apparatus including a raising step of raising a torch for electrode wires determined to be charged in the determining step.

The charging determination step may measure a current value flowing through each electrode wire, and determine whether the measured current value is charged based on whether a predetermined value exceeds a predetermined value.

The electrode wire torch may include a torch for root electrode wire and a torch for face electrode wire, and the ascending step may include the torch for the root and face electrode wire when the torch for the root or face electrode wire is lifted. The torch for the electrode wire which has been raised at the same time and rises at the same time can be lowered by ascending at the same time.

Further, the rising step may increase the electrode wire supply amount of the torch for the electrode wire raised after raising the torch for the electrode wire determined to be charged in the charging determination step.

In addition, the rising step may restore the supply amount of the torch for the electrode wire, the supply amount is reduced when the torch for all the electrode wire is raised.

The present invention can remove the space generated by the molten metal is not filled through the above configuration.

In addition, the present invention can control the molten metal filling on both sides through the stick out control.

1 is a schematic diagram of a conventional tandem electrogas arc welding apparatus.
2 is a schematic view of a welded portion of a conventional tandem electrogas arc welding.
3 is a partial perspective view of a tandem electro gas arc welding apparatus of the present invention.
4 is a schematic view of a tandem electro gas arc welding apparatus of the present invention.
5A to 5C are operational state diagrams of the tandem electro gas arc welding apparatus of the present invention.
6 is a flowchart of stick out control of the tandem electro gas arc welding apparatus of the present invention.

Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings.

3 shows a partial perspective view of a tandem electro gas arc welding apparatus 100 according to the present invention. As shown in FIG. 3, the tandem electro gas arc welding device 100 includes a support carriage body 180 and a welding carriage body 180 which is moved up and down along the rake gear 171 disposed in the up and down direction on the support 170 and The torch 110 for the root electrode wire and the torch 120 for the face electrode wire are mounted on the welding carriage body 180.

The welding carriage body 180 is equipped with elevating means 181 for providing a driving force so that the welding carriage body 180 can be raised and lowered along the rack gear 171. One side of the welding carriage main body 180 is mounted with a rack gear 184 in the front-rear direction (face-root direction), the torch 110 for the root electrode wire and the face electrode wire along the rack gear 184 The plate 182 is moved back and forth so that the torch 120 oscillates together, and the plate 182 has a driving unit 183a therein to provide driving force for oscillation.

In addition, the plate 182 is provided with a vertical gear (183) on the opposite side of the rack (184), which is fixed to the root electrode wire torch 110, the torch for the face electrode wire And a fixing part 185 for allowing the relative movement of the root electrode wire torch 110 in the vertical direction with respect to 120. The fixing part 185 includes a driving means 185a therein to provide a driving force of relative motion with respect to the face electrode wire torch 120 of the root electrode wire torch 110.

In addition, the fixing portion for fixing the face electrode wire torch 120 to the lex gear 183, and allows the relative movement of the face electrode wire torch 120 in the vertical direction with respect to the root electrode wire torch 110. (186). The fixing part 186 includes a driving means 186a therein to provide a driving force of relative motion with respect to the root electrode wire torch 110 of the face electrode wire torch 120.

The support 170, the welding carriage body 180, and the plate 182 are formed with a guide member (not shown) for guiding the operation of the member for moving the rack gear formed in each member. That is, to guide the movement of the welding carriage body 180 with respect to the support 170, the movement of the plate 182 with respect to the welding carriage body 180, and the movement of the fixing portions 185, 186 with respect to the plate 182. Guide members (not shown) may be formed.

As described above, the tandem electro gas arc welding apparatus 100 of the present invention includes only the driving units 181 and 183a for moving the torch 110 for the root electrode wire and the torch 120 for the face electrode wire together in the vertical direction and the front-back direction. Rather, it includes driving means 185a and 186a for allowing the torch 110 for the root electrode wire and the torch 120 for the face electrode wire to move in the vertical direction with respect to each other.

Accordingly, the tandem electro gas arc welding apparatus 100 of the present invention may move the torch 110 for the root electrode wire and the torch 120 for the face electrode wire together while moving them differently as necessary.

In the present invention, the welding carriage body 180, the plate 182 through the pinion (not shown) connected to the drive means (185a, 186a), the lifting means 181, the drive unit 183a and the lag gears (171, 183, 184). However, the fixing parts 185 and 186 are described as being moved, but the present invention is not limited thereto, and the same configuration may be achieved using other equalization means, for example, a linear motor or an actuator.

4 is a schematic diagram of a tandem electro gas arc welding apparatus 100 of the present invention.

The tandem electro gas arc welding apparatus 100 of the present invention is a torch for root electrode wire 110 disposed close to the root side and a torch 120 for face electrode wire disposed close to the face side, a torch for the root and face electrode wire. Welding carriage body 180 for moving the (110, 120), wire feeder (191, 192) for supplying the root and face electrode wire, power supply unit 195 for supplying power to the root and face electrode wire and connected to them And a controller 190 for controlling.

The fixing part 185 directly fixing the torch 110 for the root electrode wire is connected to the driving means 185a providing the driving force in the vertical direction, and the fixing part directly fixing the torch 120 for the face electrode wire ( 186 is connected with drive means 186a which provides a driving force in the vertical direction.

The fixing parts 185 and 186 are connected to the plate 182, and the plate 182 includes a driving unit 183a for oscillating the plate 182 in the front-rear direction. The plate 182 is connected to the welding carriage body 180, the welding carriage body 180 is the root and face with the driving force of the elevating means 181 in the vertical direction (vertical) direction along the support 170 (see Fig. 3). The torch 110 or 120 for the electrode wire is moved.

The elevating means 181, the driving unit 183a and the driving means 185a, 186a are connected to the control unit 190, and the root and / or face electrode wires in the front-rear direction or the vertical direction according to the signal of the control unit 190. Move the torch 110, 120.

Meanwhile, wire supply units 191 and 192 for supplying electrode wires to the torch 110 and 120 for the root and face electrode wires are also connected to the control unit 190, and the wire supply units 191 and 192 are wire feed amounts. It is configured to control, and adjusts the supply amount of the electrode wire fed to the torch (110, 120) for the root and face electrode wire according to the signal of the controller 190.

The power supply unit 195 supplies power to the root and face electrode wires, and sensors 196 and 197 that measure current values I _root and I _{face of the} root and face electrode wires at the tip of the supply section to the root and face electrode wires, respectively. ) Is mounted, and the sensors 196 and 197 are connected to the controller 190 to provide the measured value to the controller 190.

5A-5C, the operation of tandem electrogas arc welding apparatus 100 of the present invention is shown.

As shown in FIG. 5A, the torch 110 for the root electrode wire and the torch 120 for the face electrode wire are oscillated, whereby the molten metal is filled in the weld. However, in general, the root side has different application requirements such that the width of the weld is smaller than the width of the face side weld (see FIG. 2), and the characteristics of the arc are also different. Thus, when the same voltage is supplied, the speed at which the weld is filled by the molten metal 132 is different. That is, as shown in FIG. 5A, the root side may be charged first than the face side.

In this case, the root side is filled first, so that the distance between the root electrode wire torch 110 and the welded material 130 is closer than the distance between the face electrode wire torch 120 and the welded material. . That is, when charging is completed, the length of the electrode wire is shortened. When the length of the electrode wire is shortened, the resistance value of the electrode wire is reduced, and accordingly, the current value flowing in the electrode wire is increased. In the present invention, as shown in Figure 4 through the sensors 196, 197 for measuring the current value of each electrode wire, while measuring the current value, a predetermined current value (I _{set , face} , I _{set , root} ) or more If it is measured by, it is determined that it is sufficiently charged.

When it is determined that one side is sufficiently charged through the current value, in the case of FIG. 5A, the driving means 185 raises only the root side to a predetermined distance. Only one side is elevated in FIG. 5B.

In FIG. 5B, the dotted line of the torch 110 for the root electrode wire is before rising, and the solid line is after rising. As can be seen in FIG. 5B, as the torch 110 for the root electrode wire rises, the distance between the torch 110 for the root electrode wire and the to-be-welded material 130 again increases, and thus, the root electrode wire. Since the length of the is increased, the resistance value of the electrode wire also increases. As the resistance value increases, the measured current value drops again.

In this case, the forward and backward oscillation moves together with the torch 110 and 120 for the root and the face electrode wire. Further, in order to prevent the difference between the melting of the root and the face electrode wire, the torch for the electrode wire which is not raised by adjusting the feed rate of the raised electrode wire to the lowest speed capable of arc holding, the torch for the face electrode wire in FIG. 5B is raised. It is desirable to reduce the amount of melting of the root electrode wire until it is.

In this way, the reduction of the amount of melting of the electrode wire can be achieved by reducing the supply amount of the electrode wire, the control unit 190 is issued a command to reduce the wire supply amount of the wire supply unit 192.

Since the welding proceeds in a different state in which the wire feed amount is different, the face side is also filled by melting of the face electrode wire, and the molten metal is filled in almost the same state and is shown by a dotted line in FIG. 5B.

As such, when the torch 120 for the non-rising electrode wire is charged, the current value rises in the same manner, so that the value measured by the sensor 197 mounted on the power supply unit 195 is a predetermined value (I _{set , face).} , I _{set , root} ), the torch 120 for the face electrode wire is required to be raised, and its shape is shown in FIG. 5C.

As shown in FIG. 5C, when the face side electrode wire torch 120 needs to be raised in a state where the root electrode wire torch 110 is raised, the welding carriage main body 180 rises to a predetermined distance. Since the torch 110 and 120 for the root and face electrode wires rise together when the welding carriage body 180 rises, the torch 110 for the root electrode wire rises again, so that the torch 110 for the root electrode wire is raised. 5b returns to its original position as shown in FIG. 5a at a position relatively raised with respect to the torch 120 for face electrode wire as shown in FIG.

In this case, the torch 110 for the root electrode wire maintains the same position as that of FIG. 5B due to the rising due to the rise of the welding carriage body 180 and the lowering of the fixing part 185 of the torch 110 for the root electrode wire. Can be. At this time, the supply amount of the wire supply unit 192 for supplying the electrode wire to the root electrode wire torch 110 also returns to its original state, and thus, welding may be continued in the same state as before the difference between the two sides occurs.

Therefore, the present invention enables to return to the normal state again through the stick-out control as described above, in case of excessive melting or lack of melting on one side, and thus, welding completeness may be increased.

In FIGS. 5A to 5C, the root side is charged first, but in the opposite case, that is, the face side is charged first.

6 also summarizes the procedure of the operation of the present invention.

As shown in FIG. 6, in the present invention, the current value I _{root of the root} electrode wire and the current value I _face of the face electrode wire are measured in real time, and the measured current value is determined through steps S100 to S111.

First, in the flowchart of FIG. 6, the current value I _face of the face electrode wire is compared with the set value I _{set, face} (S100), and the current value I _root of the root electrode wire is set to the set value I _set,. opposed to the _root), and (S101, 107), a step (S100, S101, S107) is the charge determination step.

The current value of i) faces the electrode wire by the charge determination step (S100, S101, S107) ( I face) and routes the current value of the electrode wire (I _root) are both respective set value _{(I set, face, I set} , _root ), ii) only the current value I _face of the face electrode wire is greater than the set value (I _{set , face} ), iii) only the current value (I _root ) of the root electrode wire is set value (I _{set ,} If larger than _root ), iv) the current value of root and face electrode wire (I _root , I _face ) are not classified as larger than the set value.

In the case of i), the common part, that is, the stick-out control in which the welding carriage main body 180 rises (S100, S101, S102, S103), and iv), the welding does not proceed sufficiently enough, so While entering the process, the process goes back to the judgment stage (S100, S107).

In the case of ii) and iii), the torch 110 and 120 for the electrode wire having the current value I _root , I _{face of the} electrode wire is larger than the set value I _{set, face} , I _{set, root} respectively. (S104, S108), the supply amount decreases after being raised (S105, S109).

If one side rises first (S104, S108), when the charging of the other side is completed, it is determined whether one electrode is moved to the ascending position (S103), and the electrode in the ascending position moves the wire feed amount at the original position and the original feeding speed. It returns to (S106, S112).

Therefore, the relative position of the torch 110 and 120 for electrode wires and the feeding amount of the electrode wires when the control is completed can be maintained in the same state.

In the above, the case of having two electrodes of the root and the face electrode has been described as an example, but the control may be performed in the same manner even when a torch for three or more electrode wires is included.

On the other hand, the present invention by controlling the torch for each electrode wire (110, 120) and the entire electrode wire torch (110, 120) as described above, while increasing the quality of the welding, it is possible to prevent the occurrence of poor welding have.

100: tandem electro gas arc welding device
110: torch for root electrode wire, 120: torch for face electrode wire
130: weld target material 132: molten metal
170: support 180: welding carriage body
181: ascent means 182: plate
183a: drive part 185, 186: fixed part
185a and 186a: drive means 190: control unit
191, 192: wire feeder 195: power supply
196, 197: sensor

Claims (10)

A torch for the root electrode wire and a torch for the face electrode wire to which the electrode wire is mounted at the tip;
A tandem electro gas arc welding apparatus for melting an arc furnace electrode wire generated by the electrode wire,
Drive means provided in the torch for each electrode wire such that the torch for the root and the face electrode wire can be individually moved in the vertical direction;
A control unit connected to the driving means to fill the torch-side molten metal for one electrode wire to a predetermined level or more and to raise the torch for the electrode wire;
Lifting means for moving both the torch for the root electrode wire and the torch for the face electrode wire; and
An electrode wire is supplied to the torch for the root and the face electrode wire, respectively, and is connected to a control unit, and includes a wire supply unit for controlling an amount of feeding of the electrode wire;
And the control unit reduces the supply amount of the electrode wire when only one of the torch for the root and the face electrode wire is raised.
delete The method of claim 1,
Measuring an individual current value flowing through the electrode wire, and further comprising a current measurement unit connected to the control unit;
And the control unit determines whether or not the torch-side molten metal for the individual electrode wire is charged based on whether the measured current value exceeds a predetermined set value.
delete delete A method of controlling the stick-out of a tandem electro gas arc welding device for welding with an arc generated from an electrode wire by using a torch for two or more electrode wires at which the electrode wire is mounted at the tip,
A charging determination step of determining whether the torch-side molten metal for each electrode wire is charged to a predetermined level or more;
And a raising step of raising the torch for electrode wire determined to be charged in the charging determination step,
The electrode wire torch includes a torch for a root electrode wire and a torch for a face electrode wire,
The ascending step simultaneously raises the torch for the root and face electrode wire when any one of the torch for the root and the face electrode wire wakes up and tries to raise the other one, and the torch for the rised electrode wire is raised position. Stick-out control of a tandem electro gas arc welding device which is moved in position. The method according to claim 6,
The charging determination step may be performed by measuring a current value flowing through each electrode wire, and determining whether the measured current value is charged based on whether a predetermined value exceeds a predetermined value. Control method. delete The method according to claim 6 or 7,
The rising step is a stickout control method of the tandem electro gas arc welding apparatus, characterized in that for increasing the electrode wire torch of the raised electrode wire torch after raising the torch for the electrode determined to be charged in the charging determination step. . The method of claim 9,
The step of raising the stickout control method of the tandem electro gas arc welding apparatus, characterized in that when the torch for all the electrode wires is raised to restore the feed amount of the torch for electrode wire is reduced.

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