JP2624417B2 - Method of removing spatter from torch nozzle of MIG welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing spatter accumulated in a torch nozzle of a welding apparatus in MIG welding.

[0002]

2. Description of the Related Art As is well known, in MIG welding, arc welding is performed while supplying a shielding gas to a welding location via a torch nozzle.

In this type of welding technique, spatter generated during welding enters and accumulates in the torch nozzle, and when the spatter accumulates in the torch nozzle, the shield gas is smoothly supplied from the torch nozzle to the welding location. Is known to adversely affect welding performance.

[0004] Therefore, it is necessary to appropriately remove the spatter accumulated in the torch nozzle. As a method for performing such a removal, for example, one disclosed in Japanese Utility Model Publication No. 55-53255 is known. I have.

[0005] This is because a sliding member is provided in the torch nozzle, and when removing the spatter, the sliding member is repeatedly slid toward the opening end of the torch nozzle when the welding operation is stopped. Is discharged.

However, in such a method of removing spatter, a sliding member and a mechanism for sliding the sliding member must be provided in the torch nozzle, and a passage for a shield gas must be formed. However, these arrangements are complicated and expensive, and the weight of the torch nozzle increases, and the operability of a robot or the like that moves the nozzle decreases.

[0007]

SUMMARY OF THE INVENTION The present invention solves such inconveniences, and can simplify the structure for removing spatter in the torch nozzle, and can efficiently and easily remove the spatter. The aim is to provide a method.

[0008]

In order to achieve the above object, the present invention provides a MIG welding apparatus for performing arc welding while supplying a shielding gas to a welding location through a torch nozzle. A method for removing accumulated spatter, in which a supply source of the shielding gas and an air supply source are switchably connected to a gas supply path connected to the torch nozzle in advance, and the supply source of the shielding gas is used during welding work. A shield gas is supplied from the gas supply source to the torch nozzle by connecting to the gas supply path, and after the welding operation is completed, the air supply source is connected to the gas supply path to supply air from the air supply source to the torch nozzle. The torch nozzle is supplied with the supply air to remove spatter in the torch nozzle.

Further, the connection of the air supply source to the gas supply path is performed immediately after the end of the welding operation.

The MIG welding apparatus may further include a moving means for moving the torch nozzle from a predetermined standby position toward the welding position during the welding operation, and returning the torch nozzle to the standby position after the welding operation is completed. The connection of the air supply source to the gas supply path for removing the spatter is performed when the torch nozzle is returned to the standby position by the moving unit after the end of the welding operation. And

In addition, before the welding operation is started, a supply source of the shielding gas is connected to the gas supply path in advance,
A shield gas is supplied from the supply source into the torch nozzle.

[0012]

According to the present invention, after the welding operation has been completed, the air is merely connected to the gas supply path by switching from the shield gas supply source to the air supply source, and the air is supplied from the air supply source to the gas supply path. The sputter is supplied to the torch nozzle via the torch nozzle via the supply air, and the sputter in the torch nozzle is removed by the supply air. Therefore, the spatter can be easily removed by using a gas supply path for supplying the shield gas to the torch nozzle.

Further, by connecting the air supply source to the gas supply path immediately after the end of the welding operation, the supply of air for removing the spatter to the torch nozzle can be made relatively easy. It is performed in a soft state, so that the spatter can be reliably removed.

The MIG welding apparatus may further comprise a moving means for moving the torch nozzle from a predetermined standby position toward the welding position during the welding operation, and returning the torch nozzle to the standby position after the welding operation is completed. When having, by connecting the air supply source to the gas supply path for removing the spatter when the torch nozzle is returned to the standby position by the moving means after the end of the welding operation, In a series of operations of the MIG welding device for the welding operation, spatter removal after the welding operation is efficiently performed.

Further, the shield gas is supplied into the torch nozzle before the start of the welding operation by connecting the supply source of the shield gas to the gas supply path before the start of the welding operation. Becomes For this reason, the air supplied into the torch nozzle for removing spatter after the end of the previous welding operation is replaced by the shielding gas before the start of the next welding operation, so that the welding operation can be performed smoothly. Done in

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of an example of a MIG welding apparatus to which the present invention is applied, FIG. 2 is a timing chart for explaining the operation, and FIG. 3 is a flowchart for explaining the operation.

In FIG. 1, reference numeral 1 denotes a welding torch including a torch nozzle 2 and an electrode tip 3, reference numerals 4 and 5 denote a gas supply source and an air supply source for supplying a shielding gas and high-pressure air to the torch nozzle 2, respectively, and reference numeral 6 denotes a welding operation. In this case, a robot (moving means) for moving the welding torch 1 toward a welding portion of a work (not shown), 7 is a welding machine body for supplying power to the electrode tip 3 during welding work, 8 is a robot 6 or welding machine body 7 Is a controller that controls the operation of the above.

The welding torch 1 is connected to a gas supply pipe 11 connected to the gas supply source 4 via a switching valve 9 and a pressure reducing valve 10 in this order, and is connected to a distal end of the gas supply pipe 11 in communication therewith. And a power supply pipe 12 made of a conductive material. The power supply pipe 12 is held by the operating arm 6 a of the robot 6 via the gas supply pipe 11. An air supply pipe 13 is led out of the gas supply pipe 11 on the downstream side of the pressure reducing valve 10, and the air supply pipe 13 is connected to the air supply source via a switching valve 14.

The electrode tip 3 is fixed to the leading end of the feed tube 12 by being electrically connected thereto, and is connected to the welding machine main body 7 through a feed line 15 led out from the rear end of the feed tube 12. Is electrically connected to

The torch nozzle 2 has an electrode tip 3
And the power supply tube 12 is extrapolated, and its rear end is
And is inserted into the rear end of the power supply tube 12 through the wire. Then, the torch nozzle 2, the power supply pipe 12, and the electrode tip 3
Is formed through a plurality of gas discharge holes 17 formed in an outer peripheral portion of a distal end portion of the power supply pipe 12.
2 are communicated with each other.

The controller 8 controls the operation of the robot 6 and the welding machine body 7 while transmitting and receiving control signals to and from the robot 6 and the welding machine body 7, and in accordance with signals from the robot 6 and the welding machine body 7, The opening and closing operation of the switching valves 9 and 14 is controlled.

In this case, during the welding operation, the robot 6 ends the welding operation from the time when the movement of the welding torch 1 is started from the predetermined standby position, and returns to the original position (standby position).
, For example, the signal a as shown in FIG.
Is output to the controller 8.

During the welding operation, the welding machine main body 7 moves the robot 6 from the time when the power supply to the electrode tip 3 is started to the time when the welding operation is completed and the power supply to the electrode tip 3 is stopped. Similarly, the signal b as shown in FIG.
Is output to the controller 8.

Next, the operation of the MIG welding apparatus will be described with reference to FIGS.

When performing MIG welding, first, the robot 6 is operated according to a command from the controller 8, whereby
The welding torch 1 is moved from a predetermined standby position toward a welding position of a work (not shown). At this time, as described above, the robot 6 outputs a signal a as shown in FIG. 2 from the start of its operation to the controller 8 until the robot 6 returns to the original position after the welding operation is completed. continue.

On the other hand, the controller 8 drives the switching valve 9 from the closed position to the open position immediately after the start of the operation of the robot 6, as shown in FIGS. Thereby, the switching valve 9, the pressure reducing valve 10, the gas supply pipe 1
1. A shield gas is supplied to the torch nozzle 2 via the power supply pipe 12 and the gas discharge hole 17 in this order, and the shield gas is further supplied from the torch nozzle 2 to a welding portion (not shown) of the work.

After the gas supply to the torch nozzle 2 is started, the welding machine body 7 is operated according to a command from the controller 8, thereby connecting the power supply line 15 and the power supply pipe 12 from the welding machine body 7. Power is appropriately supplied to the electrode tip 3 via the electrode tip, and MIG welding of the welding location is performed.

At this time, as described above, the welding machine body 7
Outputs a signal b as shown in FIG. 2 to the controller 8 continuously from the start of power supply to the end of power supply.
Then, as shown in FIG.
Is turned off, the controller 8 drives the switching valve 9 from the open position to the closed position, thereby stopping the supply of the shield gas to the torch nozzle 2.

Next, as shown in FIGS. 2 and 3, the controller 8 immediately after the operation of the welding machine body 7 has been stopped and a predetermined time t (see FIG. 2) has elapsed since the start of the operation of the robot 6. Then, the switching valve 14 is driven from the closed position to the open position. As a result, the torch nozzle 2 is moved from the air supply source 5 through the air switching valve 14, the air supply pipe 13, the gas supply pipe 11, the power supply pipe 12, and the gas discharge hole 17 in this order.
Is supplied to the torch nozzle 2, and spatter accumulated in the torch nozzle 2 during welding is discharged to the outside from the torch nozzle 2 by the supply air. Then, the switching valve 14 is driven again to the closed position by the controller 8 at the same time when the robot 6 returns to the original position and the signal a is turned off,
Thus, the supply of air to the torch nozzle 2 is stopped.

Hereinafter, this operation is repeated every time the welding operation is performed.

As described above, in this MIG welding apparatus, after the welding operation, the air supply source 5 is connected to the gas supply pipe 11 to supply the high-pressure air to the torch nozzle 2, and the spatter accumulated in the torch nozzle 2 is removed. Very easily removed.

In this case, the air supply to the torch nozzle 2 for removing the spatter is performed immediately after the end of the welding operation, and therefore, the spatter is performed in a relatively soft state. 2 is removed from within.

Air supply to the torch nozzle 2 for removing spatter is performed when the welding torch 1 is returned to the original position after the welding operation by the robot 9, in other words, for the welding operation. Since the operation is performed during a series of operations of the robot 9, the operation of removing spatter from the torch nozzle 2 is efficiently performed.

At the start of the welding operation, the shielding gas is supplied to the torch nozzle 2 before the operation of the welding machine body 7 starts.
The air in the torch nozzle 2 is replaced with the shielding gas, and the welding operation accompanying the start of the operation of the welding machine body 7 is performed smoothly.

[0035]

As is apparent from the above description, according to the present invention, after the welding operation is completed, the air is switched from the shield gas supply source to the air supply source by switching the connection with the gas supply path to the air. By supplying to the torch nozzle from the supply source via the gas supply path and removing the spatter in the torch nozzle by the supplied air, the spatter can be removed easily and efficiently with a very simple configuration. .

The connection of the air supply source to the gas supply path for removing the spatter is performed immediately after the welding operation is completed, so that the spatter can be removed in a relatively soft state. Is supplied to the torch nozzle, so that the spatter can be reliably removed.

Further, when the torch nozzle is moved from a predetermined standby position toward the welding position during the welding operation by the moving means of the MIG welding device, and returned to the original position after the welding operation is completed, the torch nozzle is moved from the welding position to the original position. When returning to the original position, an air supply source is connected to the gas supply path to supply air to the torch nozzle, and the supplied air removes spatter in the torch nozzle, so that the MIG for welding work In a series of operations of the welding apparatus, the spattering operation can be performed efficiently without stopping the operation.

Also, before the welding operation is started, the shield gas supply source is connected to the gas supply path in advance, and the shielding gas is supplied into the torch nozzle, so that the spatter in the torch nozzle can be reduced after the previous welding operation is completed. The air supplied to the torch nozzle at the time of removal can be replaced with a shielding gas before the start of the next welding operation, and therefore, the welding operation can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an example of a MIG welding apparatus to which the present invention is applied;

FIG. 2 is a timing chart for explaining the operation of the MIG welding device;

FIG. 3 is a flowchart for explaining the operation of the MIG welding device.

[Explanation of symbols]

2 ... Torch nozzle, 4 ... Shield gas supply source, 5 ... Air supply source, 6 ... Robot (moving means), 11 ... Gas supply pipe.

Claims (4)

(57) [Claims] 1. A method for removing spatter that accumulates in a torch nozzle during a welding operation in an MIG welding apparatus that performs arc welding while supplying a shielding gas to a welding location via a torch nozzle, wherein the method includes connecting to the torch nozzle in advance. The supply source of the shield gas and the air supply source are switchably connected to the supplied gas supply path, and the supply source of the shield gas is connected to the gas supply path during welding work to connect the gas supply source to the torch nozzle. A shield gas is supplied, and after the welding operation is completed, the air supply source is connected to the gas supply path to supply air from the air supply source to the torch nozzle, and the supply air removes spatter in the torch nozzle. A method for removing spatter from a MIG welding torch nozzle. 2. The method according to claim 1, wherein the connection of the air supply source to the gas supply path is performed immediately after the end of the welding operation. 3. A moving means for moving the torch nozzle from a predetermined standby position toward the welding position during the welding operation, and returning the torch nozzle to the standby position after the welding operation. The connection of the air supply source to the gas supply path for removing the spatter is performed when the torch nozzle is returned to the standby position by the moving unit after the end of the welding operation. The method for removing spatter in a torch nozzle for MIG welding according to claim 1. 4. A shield gas supply source is connected to the gas supply path in advance before the welding operation is started, and the shield gas is supplied from the supply source into the torch nozzle. 2. The method for removing spatter from a torch nozzle for MIG welding according to item 1.