JPH05212545A - Spatter removing method for torch nozzle of mig welding equipment - Google Patents

Abstract

PURPOSE:To provide the method capable of simplifying constitution to remove spatters in the torch nozzle and efficiently and easily removing the spatters. CONSTITUTION:A supply source 4 of shielding gas and an air supply source 5 are connected freely changeably to a gas supply pipe 11 connected to the torch nozzle 2 in advance. At the time of welding work, the gap supply source 5 is connected to the gas supply pipe 11 and the shielding gas is supplied to the torch nozzle 2. After the welding work is completed, the air supply source 5 is connected to the gas supply pipe 11 to supply air to the torch nozzle 2 and the spatters in the torch nozzle 2 are removed by the supplied air.

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 shield gas to a welding site through 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 in this way, the shield gas is smoothly supplied from the torch nozzle to the welding location. However, it is known that the welding performance is adversely affected.

For this reason, it is necessary to appropriately remove the spatter accumulated in the torch nozzle. As such removal, for example, the one disclosed in Japanese Utility Model Publication No. 55-53255 is known. There is.

This is because a sliding member is provided in the torch nozzle, and when spatter is removed, the sliding member is repeatedly slid toward the open end of the torch nozzle when the welding operation is stopped, whereby the inside of the torch nozzle is slid. That is, the spatter of is discharged.

However, in such a method for removing spatter, a sliding member, a mechanism for sliding the sliding member, etc. must be provided in the torch nozzle, and moreover, a passage for the shield gas must be formed. However, there is an inconvenience that these configurations become complicated and expensive, the weight of the torch nozzle increases, and the operability of a robot or the like for moving the torch nozzle decreases.

[0007]

The present invention eliminates such inconveniences and simplifies the structure for removing spatter in the torch nozzle, and the spatter can be efficiently and easily removed. The purpose 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 shield gas to a welding location through a torch nozzle, and in the torch nozzle during the welding operation. A method of removing accumulated spatter, wherein a supply source of the shield gas and an air supply source are switchably connected to a gas supply passage previously connected to the torch nozzle, and the supply source of the shield gas during the welding operation is 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, the air supply source is connected to the gas supply path to supply air from the air supply source to the torch nozzle. It is characterized in that the torch nozzle is supplied with air and the spatter inside the torch nozzle is removed.

Further, the connection of the air supply source to the gas supply passage is performed immediately after the welding work is completed.

Further, the MIG welding apparatus has 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 air supply source for removing the spatter is connected to the gas supply path when the torch nozzle is returned to the standby position by the moving means after the welding operation is completed. And

Before starting the welding operation, the shield gas supply source is connected to the gas supply passage in advance,
A shielding gas is supplied from the supply source into the torch nozzle.

[0012]

According to the present invention, after the welding work is completed, the air is supplied from the air supply source to the gas supply path only by switching the connection with the gas supply path from the shield gas supply source to the air supply source. Since the spatter in the torch nozzle is removed by being supplied to the torch nozzle via the supply air, the spatter can be easily removed by using the 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 welding operation is completed, the air for removing the spatter is supplied to the torch nozzle relatively. It is performed in a soft state, and the spatter can be surely removed.

Further, the MIG welding apparatus has 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 performing the connection of 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 welding operation is completed, In a series of operations of the MIG welding apparatus for the welding work, spatters are removed efficiently after the welding work.

By connecting the shield gas supply source to the gas supply passage in advance before starting the welding operation, the shield gas is supplied into the torch nozzle before starting 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 with the shield gas before the start of the next welding operation, and therefore the welding operation is smoothly performed. To be done.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be described with reference to FIGS. 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 its operation, and FIG. 3 is a flow chart for explaining its operation.

In FIG. 1, 1 is a welding torch provided with a torch nozzle 2 and an electrode tip 3, 4 and 5 are a gas supply source and an air supply source for supplying shield gas and high-pressure air to the torch nozzle 2, and 6 is a welding operation. At this time, a robot (moving means) for moving the welding torch 1 toward a welding position of a work (not shown), a welding machine body 7 for supplying power to the electrode tip 3 during welding work, and 8 a robot 6 and a welding machine body 7 Is a controller for controlling the operation of the above.

The welding torch 1 is connected to a gas supply pipe 11 which is connected to the gas supply source 4 through a switching valve 9 and a pressure reducing valve 10 in this order, and to the tip of the gas supply pipe 11 in communication therewith. And a power supply tube 12 made of a conductive material, and is held by the operating arm 6a of the robot 6 via the gas supply tube 11. An air supply pipe 13 is led out from a portion of the gas supply pipe 11 downstream 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 front end of the power supply tube 12 so as to be electrically conductive with the power supply tube 12, and through the power supply line 15 led out from the rear end of the power supply tube 12 to the welding machine body 7. Electrically connected to.

The torch nozzle 2 has an electrode tip 3
And the power supply pipe 12, and the rear end of the insulating member 16
It is attached to the rear end portion of the power feeding tube 12 via. Then, the torch nozzle 2, the feeding tube 12, and the electrode tip 3
The space formed between the feed tube 1 and the feed tube 12 is formed through a plurality of gas discharge holes 17 formed in the outer peripheral portion of the tip of the feed tube 12.
It is connected to the inside of 2.

The controller 8 controls the operations of the robot 6 and the welding machine main body 7 while exchanging control signals with the robot 6 and the welding machine main body 7, and in accordance with the signals from the robot 6 and the welding machine main body 7. The switching operation of the switching valves 9 and 14 is controlled.

In this case, when the welding work is started, the robot 6 finishes the welding work from the time when the welding torch 1 starts moving from the predetermined waiting position, and then the original position (standby position).
Until it returns to, for example, the signal a as shown in FIG.
Is output to the controller 8.

In the welding operation, the main body 7 of the welding robot 6 is operated from the time when the power supply to the electrode tip 3 is started until the end of the welding operation and the power supply to the electrode tip 3 is stopped. Similarly to 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 FIG. 1 and according to FIGS.

When performing MIG welding, first, the robot 6 is activated by a command from the controller 8 and
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 to the controller 8 from the start of its operation until the robot 6 returns to its original position after the welding work is completed. continue.

On the other hand, as shown in FIGS. 2 and 3, the controller 8 drives the switching valve 9 from the closed position to the open position immediately after the operation of the robot 6 is started. Thereby, the switching valve 9, the pressure reducing valve 10, the gas supply pipe 1 from the gas supply source 4
1, the shield gas is supplied to the torch nozzle 2 through 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 the welding portion (not shown) of the work.

As described above, after the gas supply to the torch nozzle 2 is started, the welding machine main body 7 is operated by the command of the controller 8, whereby the power supply line 15 and the power supply pipe 12 are connected from the welding machine main body 7. Power is appropriately supplied to the electrode tip 3 via the MIG welding at the welding location.

At this time, as described above, the welding machine main body 7
Continuously outputs the signal b as shown in FIG. 2 to the controller 8 from the power feeding start time to the power feeding end time.
Then, as shown in the figure, when the welding work is completed, the signal b
At the same time, 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, immediately after the operation of the welding machine main body 7 is stopped, the controller 8 has passed a predetermined time t (see FIG. 2) from 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 passed 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.
High-pressure air is supplied to the torch nozzle 2, and the supplied air discharges the spatter accumulated in the torch nozzle 2 during welding from the torch nozzle 2. Then, the switching valve 14 is driven to the closed position again by the controller 8 at the same time when the robot 6 returns to the original position and the signal a is turned off.
As a result, the air supply to the torch nozzle 2 is stopped.

Hereinafter, this operation will be repeated every time a 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 and only the high pressure air is supplied to the torch nozzle 2, so that the spatter accumulated in the torch nozzle 2 is generated. Very easily removed.

In this case, the air is supplied to the torch nozzle 2 for removing the spatter immediately after the welding work is completed, and therefore the spatter is performed in a relatively soft state, so that the spatter is surely carried out. It is removed from within 2.

Air is supplied to the torch nozzle 2 for removing spatter when the robot 9 returns the welding torch 1 to the original position after the welding operation, in other words, for the welding operation. Since the robot 9 is performed while the series of operations is being performed, the work of removing the spatter inside the torch nozzle 2 is efficiently performed.

At the start of the welding operation, since the shield gas is supplied to the torch nozzle 2 prior to the start of the operation of the welder body 7, before the start of the operation of the welder body 7,
The air in the torch nozzle 2 is replaced with the shield gas, and the welding work accompanying the start of operation of the welder body 7 is smoothly performed.

[0035]

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

By connecting the air supply source to the gas supply path for removing the spatter immediately after the welding work is completed, the spatter is removed in a relatively soft state of the spatter. Air is supplied to the torch nozzle, so that the spatter can be reliably removed.

Further, when the torch nozzle is moved from the predetermined standby position toward the welding position during the welding operation by the moving means of the MIG welding device and is returned to the original position after the welding operation is completed, the torch nozzle is moved from the welding position. When returning to the original position, the air supply source was connected to the gas supply path to supply air to the torch nozzle, and the supplied air removed the spatter inside the torch nozzle, which enabled the MIG for welding work. In a series of operations of the welding apparatus, it is possible to efficiently perform the sputter operation without stopping the operations.

Further, by connecting the supply source of the shield gas to the gas supply path in advance before starting the welding work and supplying the shield gas into the torch nozzle, the spatter inside the torch nozzle is generated after the end of the previous welding work. The air supplied to the torch nozzle at the time of removal can be replaced with the shield gas before the start of the next welding operation, and therefore the welding operation can be smoothly performed.

[Brief description of 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 apparatus,

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

[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)

[Claims] 1. A MIG welding apparatus for performing arc welding while supplying a shield gas to a welding location through a torch nozzle, which is a method for removing spatters accumulated in the torch nozzle during the welding operation, which is connected to the torch nozzle in advance. The shield gas supply source and the air supply source are switchably connected to the gas supply path, and the shield gas supply source is connected to the gas supply path during welding work to connect the torch nozzle 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 in a torch nozzle for MIG welding, which is characterized by the above. 2. The method for removing spatter in a MIG welding torch nozzle according to claim 1, wherein the air supply source is connected to the gas supply passage immediately after the welding operation is completed. 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 completion of the welding operation. The air supply source for removing the spatter is connected to the gas supply path when the torch nozzle is returned to the standby position by the moving means after the welding operation is completed. The method for removing spatter in a torch nozzle for MIG welding according to claim 1. 4. The shield gas supply source is connected to the gas supply passage in advance before the welding work is started, and the shield gas is supplied from the supply source into the torch nozzle. 2. A method for removing spatter in a MIG welding torch nozzle according to 1.