JPH10314942A - Welding wire feed position setting device - Google Patents

Abstract

(57) [Problem] To provide a welding wire feeding position setting device and an automatic welding device which can save time in a welding operation. A welding wire (4) is provided between a welding wire (4) and a base material (9).
When a voltage is applied between the electrode and the non-consumable electrode 2 and the two electrodes come into contact with each other, a current flows and the voltage becomes almost 0 V, and the respective voltages Ea and Eb or the currents Ia and Ia are used.
By monitoring b and detecting the tip position of the welding wire 4, the feeding position of the welding wire 4 at the start of welding is set appropriately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding wire feed position setting device for arc welding using non-consumable electrodes, and a welding wire feed position for automatically setting a welding wire feed position at the start of welding. The present invention also relates to a non-consumable electrode arc automatic welding apparatus equipped with the setting and the welding wire feeding position setting apparatus.

[0002]

2. Description of the Related Art In arc welding performed using a non-consumable electrode, when a welding wire feeding position is not appropriate with respect to an arc generated from the non-consumable electrode or a molten pool formed by the arc at the start of welding, a non-consumable electrode is used. The consumable electrode may be damaged, or welding may not start.

Conventionally, the position of the welding wire feeding position has been visually adjusted by a human using a ruler or the like before the start of welding.
In the case of remote control, a moving axis is provided on a welding wire feeding guide, and a feeding position is set by relying on a CCD camera or the like.

[0004]

In arc welding using a non-consumable electrode, the welding position and the shape of the molten pool due to the thermal deformation of the base material and the position change, and the influence of the bending habit of the welding wire, etc., cause the welding. The proper feeding position of the wire changes. Therefore, the welding wire feeding positions at the time of starting welding and the time of finishing welding do not always match.

In the method of setting a feed position in which a moving shaft is provided on the welding wire feed guide and the moving shaft is returned to the original position at the start of welding, the feed position is slightly shifted due to the bending habit of the welding wire. Occurs. When the same welding line is repeatedly welded in all postures such as multi-layer welding, the feed position of the welding wire must be adjusted and set every time welding of each layer is started.

For the above reasons, it is necessary to take time to set the welding wire feeding position, which is an obstacle to improving the efficiency of the welding operation.

An object of the present invention is to provide a welding wire feeding position setting device and an automatic welding device which can save time in a welding operation by automatically setting a welding wire feeding position.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a method for setting a welding wire feeding position in an arc welding apparatus using a non-consumable electrode, for example, applying a voltage between a welding wire and a base material by a power supply. The contact of the tip of the welding wire to the base metal is detected by monitoring the voltage or the current of the voltage application circuit, and a voltage is applied between the welding wire and the non-consumable electrode by a power supply, and the voltage, Alternatively, by detecting the position of the tip of the welding wire by detecting the contact of the tip of the welding wire with the non-consumable electrode by monitoring the current of the voltage application circuit, moving the welding wire feed guide to an arbitrary position after detecting the position of the tip of the welding wire. This is achieved by using

According to the present invention, in an arc welding apparatus using non-consumable electrodes, a voltage is applied between a welding wire and a base material, and between a welding wire and a non-consumable electrode. Utilizing the phenomenon that the flow and voltage become almost 0V, each voltage or the current of the voltage application circuit is monitored, and by detecting the tip position of the welding wire, the welding wire feeding position at the start of welding is properly adjusted. Is set to

As means for detecting contact, a voltage,
The combination of the current monitoring of the voltage application circuit is arbitrary in the detection of contact with the base material and the detection of contact with the electrodes, and the same control may be performed by using them individually.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows that the welding wire feeding and the movement of the welding wire feeding guide according to the present invention detect the contact with the base material and the contact with the non-consumable electrode by a voltage change, and determine the welding wire feeding position. It is a flowchart of the setting method of the welding wire feeding position setting device to set. First, the welding wire withdrawal amounts S1 and S2, the origin G of the welding wire feed guide moving stage, and the proper distance L between the welding wire and the non-consumable electrode at the start of welding are set and stored. Move to the starting position. The moving stage of the welding wire feeding guide is returned to the origin G. Start applying a voltage between the welding wire and the base material, feed the welding wire, monitor the voltage Ea between the welding wire and the base material, and stop feeding the welding wire when the voltage Ea becomes almost 0V. Then, the application of the voltage between the welding wire and the base material is stopped, and the welding wire is pulled back to S1.

Next, the application of a voltage between the welding wire and the non-consumable electrode is started, and the welding wire feeding guide moving stage is moved in the direction of the non-consumable electrode.
b, when the voltage Eb becomes almost 0 V, the movement of the welding wire feeding guide moving stage is stopped, the voltage application between the welding wire and the non-consumable electrode is stopped, and the welding wire feeding guide moving stage is stopped. Is retracted an appropriate distance L. Further, the welding wire is pulled back S2.

FIG. 2 shows that the welding wire feeding and the movement of the welding wire feeding guide according to the present invention detect the contact with the base material and the contact with the non-consumable electrode by a change in current, and determine the welding wire feeding position. It is a flowchart of the setting method of the welding wire feeding position setting device to set.

First, the welding wire withdrawal amounts S1 and S2
And the origin G of the welding wire feeding guide moving stage and the distance L between the welding wire and the non-consumable electrode which are appropriate at the start of welding are set and stored, and the non-consumable electrode is moved to the position where welding is started. Set the moving stage of the welding wire feed guide to the origin G
To return to. Voltage application is started between the welding wire and the base material, the welding wire is fed, and the current Ia of the voltage application circuit between the welding wire and the base material is monitored. When the current Ia is no longer 0 A, the welding wire is sent. The supply is stopped, the voltage application between the welding wire and the base material is stopped, and the welding wire is pulled back to S1.

Next, voltage application is started between the welding wire and the non-consumable electrode, the welding wire feeding guide moving stage is moved in the direction of the non-consumable electrode, and the current Ib of the voltage application circuit between the welding wire and the non-consumable electrode is changed. Monitoring, when the current Ib is no longer 0 A, stop the movement of the welding wire feeding guide moving stage, stop applying the voltage between the welding wire and the non-consumable electrode,
The welding wire feeding guide moving stage is moved backward by an appropriate distance L. Further, the welding wire is pulled back S2.

FIG. 3 shows an embodiment of the present invention in which the welding wire feeding position at the start of welding is applied between the welding wire and the base metal and between the welding wire and the non-consumable electrode, and each voltage is applied. By monitoring and detecting the tip position of the welding wire,
FIG. 2 is a block diagram of a non-consumable electrode arc automatic welding apparatus equipped with a welding wire feeding position setting device for appropriately setting a welding wire feeding position.

The non-consumable electrode arc automatic welding apparatus comprises a non-consumable electrode 2 attached to the tip of a welding torch 1, a welding power source 3, a welding wire feeding device 5 for feeding a welding wire 4, and a welding wire. Welding wire feeding guide moving stage 7 as means for supporting feeding guide 6 and moving back and forth, welding torch 1 and welding wire guide moving stage 7
And a truck 8 which is a means for self-propelled in the welding line direction,
Welding wire base metal power supply 10 as a means for applying a voltage between welding wire 4 and base material 9 and welding wire base material switch 11 as a means for connecting a voltage application circuit between welding wire 4 and base material 9 And a base metal contact detection device 12 for detecting the contact between the welding wire 4 and the base metal 9 by detecting and monitoring the voltage Ea from the welding wire base metal power supply 10.
And a welding wire non-consumable electrode power source 13 for applying a voltage between the welding wire 4 and the non-consumable electrode 2 and a welding wire for connecting a voltage applying circuit between the welding wire 4 and the non-consumable electrode 2. A non-consumable electrode contact detecting device which detects a contact between the welding wire 4 and the non-consumable electrode 2 by detecting and monitoring the voltage Eb from the non-consumable electrode switch 14 and the welding wire non-consumable electrode power supply 13. 15 and a general control device 16 which is a means for integrally controlling each of the above devices.
And is configured.

In this embodiment, a computer is used as the general control device 16, but a dedicated arithmetic control device or the like may be used. Further, the means for mounting the welding torch 1 and the welding wire feeding guide moving stage 7 and moving in the welding line direction is not limited to the bogie 8 but may be a robot,
A manipulator may be used. The non-consumable electrode power source 13 is a means for bringing the non-consumable electrode 2 into contact with the base material 9 and applying a voltage between the welding wire 4 and the non-consumable electrode 2.
And a welding wire non-consumable electrode switch 14 for connecting a voltage application circuit between the welding wire 4 and the non-consumable electrode 2.
May be used to form a voltage application circuit for the welding wire 4 and the base material 9.

The operation of the apparatus having the above configuration will be described below. First, the carriage 8 is moved to the welding start point on the base material 9 to be welded,
The welding torch 1 is lowered toward the base material 9 to a position where welding can be started. The overall control device 16 activates the welding wire feeding guide moving stage 7 and returns the welding wire feeding guide moving stage 7 to the origin G previously set and stored. The power supply 10 between the welding wire base materials is activated, and the switch 11 between the welding wire base materials is connected. Welding wire feeder 5
, The welding wire 4 is sequentially fed. At this time, the voltage Ea of the welding wire base metal power source 10 is detected and monitored by the base metal contact detection device 12, and when Ea ≒ 0, it is determined that the welding wire 4 has come into contact with the base metal 9, and welding is performed. The feeding of the wire 4 is stopped. Thereafter, the welding wire 4 is pulled back by a certain amount S1.

Next, the welding wire non-consumable electrode power supply 13 is activated, and the welding wire non-consumable electrode switch 14 is connected. The welding wire feeding guide moving stage 7 is moved toward the non-consumable electrode 2. At this time, the non-consumable electrode contact detection device 15 detects the voltage E of the welding wire non-consumable electrode power supply 13.
b is detected and monitored, and when Eb ≒ 0, it is determined that the welding wire 4 has come into contact with the non-consumable electrode 2, and the movement of the welding wire supply guide moving stage 7 is stopped.

Then, the welding wire feeding guide moving stage 7 is retracted by a predetermined amount L, and the welding wire 4 is pulled back by S2 which has been set and stored in advance. The overall control device 16 performs the above-described processing every time the welding is started, and always appropriately sets the feeding position of the welding wire 4 at the time of starting the welding.

FIG. 4 shows an embodiment of the present invention in which the welding wire feeding position at the start of welding is applied with a voltage between the welding wire and the base material and between the welding wire and the non-consumable electrode. A block diagram of a non-consumable electrode arc automatic welding device equipped with a welding wire feeding position setting device that appropriately sets a welding wire feeding position by monitoring a circuit current and detecting a tip position of the welding wire. It is shown.

The non-consumable electrode arc automatic welding apparatus includes a non-consumable electrode 2 attached to a tip of a welding torch 1, a welding power source 3, a welding wire feeding device 5 for feeding a welding wire 4, and a welding wire. A means for supporting the feeding guide 6 and moving it back and forth, a welding wire feeding guide moving stage 7, and a means for mounting the welding torch 1 and the welding wire guide feeding guide moving stage 7 and self-propelling in the direction of the welding line. , A welding wire connecting the welding wire 4 and the base material 9, and a welding circuit connecting the welding wire 4 and the base material 9 to a voltage applying circuit between the welding wire 4 and the base material 9. The switch 11 between the wire base materials and the power supply 1 between the welding wire base materials
A base metal contact detection device 12 that detects the contact between the welding wire 4 and the base material 9 by detecting and monitoring the current Ia of the voltage application circuit from 0, and a voltage between the welding wire 4 and the non-consumable electrode 2. , A welding wire non-consumable electrode power supply 17, a welding wire non-consumable electrode switch 14 for connecting a voltage application circuit between the welding wire 4 and the non-consumable electrode 2. A non-consumable electrode contact detecting device 18 for detecting the contact between the welding wire 4 and the non-consumable electrode 2 by detecting and monitoring the current Ib of the voltage application circuit from the inter-electrode power supply 13 and integrally controlling the above devices. And an overall control device 16 which is a means for performing this.

In this embodiment, a computer is used as the general control device 16, but a dedicated arithmetic control device or the like may be used. Further, the means for mounting the welding torch 1 and the welding wire feeding guide moving stage 7 and moving in the welding line direction is not limited to the bogie 8 but may be a robot,
A manipulator may be used. The non-consumable electrode power source 13 is a means for bringing the non-consumable electrode 2 into contact with the base material 9 and applying a voltage between the welding wire 4 and the non-consumable electrode 2.
And a welding wire non-consumable electrode switch 14 for connecting a voltage application circuit between the welding wire 4 and the non-consumable electrode 2.
May be used to form a voltage application circuit for the welding wire 4 and the base material 9.

The operation of the apparatus having the above configuration will be described below. First, the carriage 8 is moved to the welding start point on the base material 9 to be welded,
The welding torch 1 is lowered toward the base material 9 to a position where welding can be started. The overall control device 16 activates the welding wire feeding guide moving stage 7 and returns the welding wire feeding guide moving stage 7 to the origin G previously set and stored. The power supply 10 between the welding wire base materials is activated, and the switch 11 between the welding wire base materials is connected. Welding wire feeder 5
, The welding wire 4 is sequentially fed.

At this time, the current Ia of the voltage application circuit is detected and monitored by the base metal contact detection device 17 from the power supply 10 between the bases of the welding wires, and when Ia ≠ 0, the contact between the welding wire 4 and the base metal 9 is established. Then, the feeding of the welding wire 4 is stopped. Thereafter, the welding wire 4 is pulled back by a certain amount S1.

Next, the welding wire non-consumable electrode power supply 13 is activated, and the welding wire non-consumable electrode switch 14 is connected. The welding wire feeding guide moving stage 7 is moved toward the non-consumable electrode 2. At this time, the non-consumable electrode contact detection device 15 detects and monitors the current Ib of the voltage application circuit of the welding wire non-consumable electrode power supply 18, and when Ib ≠ 0, the contact between the welding wire 4 and the non-consumable electrode 2 is detected. Then, the movement of the welding wire feeding guide moving stage 7 is stopped.

After that, the welding wire feed guide moving stage 7 is retracted by a fixed amount L, and the welding wire 4 is pulled back by S2 which has been set and stored in advance. The overall control device 16 performs the above-described processing every time the welding is started, and always appropriately sets the feeding position of the welding wire 4 at the time of starting the welding.

FIG. 5 shows an embodiment of the present invention in which a welding wire feeding position at the start of welding is applied between the welding wire and the base material and between the welding wire and the non-consumable electrode. A diagram schematically illustrating a setting method of a welding wire feeding position setting device that appropriately sets a welding wire feeding position by monitoring a current of a voltage application circuit and detecting a tip position of the welding wire. It is.

In the case of (1), the welding wire feeding guide moving stage 7 returns to the origin G set and stored in advance. In the case of (2), the contact between the welding wire 4 and the base material 9 is detected by feeding the welding wire 4 and monitoring the voltage Ea between the welding wire 4 and the base material 9 or the current Ia of the voltage application circuit. Then, the feeding of the welding wire 4 is stopped. In the case of (3), the welding wire 4 is pulled back by a predetermined amount S1 set and stored in advance.

In the case of (4), the welding wire feeding guide moving stage 7 is moved toward the non-consumable electrode 2, and the voltage Eb between the welding wire 4 and the non-consumable electrode 2 or the current Ib of the voltage application circuit is monitored. Thereby, the contact between the welding wire 4 and the non-consumable electrode 2 is detected, and the movement of the welding wire feeding guide moving stage 7 is stopped. At the time of (5), the welding wire feeding guide moving stage 7 is retracted by a predetermined amount L set and stored in advance. In the case of (6), the welding wire 4 is pulled back by a predetermined amount S2 set in advance and stored, and set to an appropriate wire feeding position at the start of welding.

[0033]

According to the present invention, the feed position of the welding wire at the start of welding can be automatically optimized.
It is possible to omit a complicated welding wire feeding alignment operation at the start of welding, which must be adjusted due to a welding posture, a bending tendency of the welding wire, and the like.

[Brief description of the drawings]

FIG. 1 is a flowchart of a setting method of a welding wire feeding position setting device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a setting method of a welding wire feeding position setting device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a non-consumable electrode arc automatic welding apparatus equipped with a welding wire feeding position setting device according to a first embodiment of the present invention.

FIG. 4 is a block diagram of a non-consumable electrode arc automatic welding apparatus equipped with a welding wire feeding position setting device according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a setting method of the welding wire feeding position setting device according to the first and second embodiments of the present invention.

[Explanation of symbols]

1 ... welding torch, 2 ... non-consumable electrode, 3 ... welding power supply, 4 ...
Welding wire, 5: welding wire feeding device, 6: welding wire feeding guide, 7: welding wire feeding guide moving stage,
8 trolley, 9 base material, 10 power source between welding wire base materials, 1
DESCRIPTION OF SYMBOLS 1 ... Base material contact detection device, 12 ... Switch between welding wire base materials, 13 ... Power supply between welding wire non-consumable electrodes, 14 ... Switch between welding wire non-consumable electrodes, 15 ... Non-consumable electrode contact detection device, 16 ... General control Apparatus, 17 ... Base material contact detection apparatus,
18: non-consumable electrode contact detection device, Ea: voltage between welding wire base materials, Eb: voltage between welding wire non-consumable electrodes, Ia: voltage application circuit between welding wire base materials, Ib: voltage application between welding wire non-consumable electrodes Circuit current, S1: Arbitrarily set welding wire pullback amount, S2: Arbitrarily set welding wire pullback amount, G: Arbitrarily set welding wire feed guide moving stage origin, L: Non-appropriate at the start of welding Distance between consumable electrode and wire tip.

Claims (1)

[Claims] In a welding wire feeding position setting device for an arc welding apparatus using a non-consumable electrode, a welding wire feeding guide and a support portion of the welding wire feeding guide are moved toward or away from the non-consumable electrode. Move in the direction (back and forth)
Welding wire feeding guide moving means for storing an arbitrary position; base material contact detecting means for detecting contact between the welding wire and the base material; electrode contact detecting means for detecting contact between the welding wire and the non-consumable electrode; A welding wire feeding means for feeding a wire, wherein the welding wire feeding means and the base material contact detecting means set a vertical distance between the tip of the welding wire and the base material, and the welding wire feeding guide. A welding wire feeding position setting device for automatically setting a welding wire feeding position by setting a horizontal distance between a tip of a welding wire and a non-consumable electrode by a moving means and an electrode contact detecting means.