JPS5847570A - Controller for feeding of wire - Google Patents

Abstract

PURPOSE:To control feeding of a welding wire automatically, and adequately in an automatic arc welder by providing a detecting circuit for short circuiting between the wire and objects to be welded during inching and a wire retracting circuit which pulls back the wire. CONSTITUTION:When a welding wire 2 is fed by inching and contacts with objects 1a, 1b to be welded, a closed circuit including a welding control circuit 10 and a detecting circuit 9 for short circuiting of the wire is formed. The short circuiting of the wire 2 and the objects 1a, 1b is detected with the circuit 9, by which the feeding of the wire 2 is stopped. At the same time, a wire inching circuit 8 goes off and a signal is transmitted from the circuit 9 to a wire retracting circuit 7, a control circuit 5 for feed speed of the wire, and a wire feed motor 4, so that the wire 2 is retracted automatically to the projecting length which is made adequate at the start of welding, thus even when the wire 2 contacts with the objects to be welded during inching, the wire is prevented from deforming at the tip or from slipping between feed rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to welding wire feeding control in automatic arc welding equipment using consumable electrodes and filler wire feeding control in automatic arc welding equipment using non-consumable electrodes. The present invention relates to a wire feeding control device used.

Generally, in automatic welding equipment that involves wire feeding,
In order to confirm or correct the target position of the wire tip relative to the workpiece, the wire is moved when not welding.

However, if the wire is fed excessively, the tip of the wire collides with the object to be welded, and the protruding portion of the wire is deformed, making it impossible to use it for the purpose of confirming the wire aiming position.

In such cases. After removing the welding torch from the object to be welded and removing the deformed portion of the wire, it is necessary to bring the welding torch closer to the object to be welded and repeat the above-described operation of confirming the wire aiming position. In addition, when the tip of the wire collides with the workpiece, wire feeding is obstructed, causing a cesslip between the wire feeding roller of the wire feeding device and the wire. It may even be removed by Moreover, the scratches on the wire scraped by the feed roller cause an increase in the wire feed resistance, and if the scraps accumulate in the wire feed path, this also causes an increase in the wire feed resistance. , which hinders good welding.

Furthermore, when using a large diameter wire such as Zabumaji welding, if the wire comes into contact with the workpiece and the wire feeding tip continues, the workpiece may be moved by the wire. Or, conversely, if the traveling truck on which the wire feeding device is mounted vibrates, the placement of the object to be welded or the aim of the wire must be corrected again.

In this way, simple-to-see operations such as wire cutting/ching feeding involve surprisingly large problems.

The present invention solves these conventional drawbacks and eliminates deformation of the wire, slip between the wire feed roller and the wire, movement of the object to be welded, and vibration of the wire feed device during wire inching. The purpose of this is to enable good wire feeding.

The present invention includes a wire short circuit detection circuit that detects contact between the wire and the workpiece during inching, and a wire system that uses the signal detected by the wire short circuit detection circuit to pull the wire to an appropriate protrusion length at the start of welding. Hereinafter, an embodiment of the present invention will be explained using the lunar surface.

The figure shows the feed control circuit for welding wire, which is a consumable electrode, in automatic arc welding using a consumable electrode, and the filler wire feed control circuit in automatic arc welding, which uses a non-consumable electrode. 11L, 1b is a workpiece to be welded, 2 is a wire, 3 is a wire feeding tip, 4 is a wire feeding motor for feeding wire 2, and 6 is a block circuit diagram showing this wire. A wire feeding speed control circuit that controls the speed of the feeding motor 4, 6 a wire feeding circuit, 7 a wire retracting circuit for pulling back the wire 2, 8 a wire inching circuit, 9 the wire 2 and the workpiece 11L, 1o is a welding control circuit, 11 is a wire retraction speed regulator, and 12 is a wire retraction time regulator.゛In this embodiment, in order to check whether the 5th end of the wire '2 is at the proper aiming position of the butt part of the welded objects 11L and 1b when not welding, press the wire inching push button switch etc. 1. When the wire inching circuit 8 feeds the wire feeding circuit 6. Wire feed speed 1 degree control circuit 6. A signal is transmitted to the wire feeding motor 4, and the wire 2 is fed from the tip of the wire feeding tip 3.

Initially, when the tip of the wire 2 is at a distance of 11 from the tip of the wire feeding tip 3, the wire 2 is fed further by inching until it reaches a distance of 11+12. As a result, the tip of the wire 2 contacts the workpiece 1as 1b, and the wire feeding tip 32 connects the wire 2 to the workpiece 1as 1b.
1L, 1b, welding control circuit 10# Wire short-circuit detection circuit 9e A closed loop of the wire feeding tip 3 is configured, and it is detected that the wire 2 is electrically short-circuited with the workpieces 11L and '1b. The wire feeding is stopped when the wire short circuit is detected, and even if the wire inching push button switch etc. is continued to be pressed, the wire short circuit detection circuit 9 memorizes the wire short circuit detection, so this interlock causes the wire 2 to be fed and displayed. stomach. The reason why the welding control circuit 1o is inserted into the closed loop is to prevent an expansion loop from forming during welding. Then, confirm the wire short circuit detection and confirm that the wire inching circuit 8 is turned off. Wire short circuit detection circuit branch circuit 7. Wire feed speed control circuit6. A signal is transmitted to the wire feed motor 4, and the wire 2 is automatically retracted. When the protrusion length 11 of the wire 2, which is considered appropriate at the start of welding, is reached, the retraction is automatically stopped. At the same time, the memory of the wire short circuit detection is also reset.

The distance of the protrusion length 11 of the wire 2 that is appropriate at the start of welding is determined by the wire retract speed regulator 11 and the wire retract time regulator 12, each of which can be adjusted independently. - As described above, according to the wire feeding control device of the present invention, it is possible to detect an electrical short circuit of the wire to the welded material by feeding the wire by inching when not welding, and to detect an electrical short circuit when starting welding. Even if the wire comes into contact with the workpiece during retracting, winding, or chugging to the desired wire protrusion length, the wire tip may be deformed, or the wire and wire feed roller may be damaged. The wire can be fed smoothly without slipping between the welding device, movement of the object to be welded, or vibration of the wire feeding device causing the target position to shift. By being able to perform welding of excellent quality, both
This eliminates the need to correct the target position due to ear deformation or the positional deviation of the object to be welded or the wire feeding device, and welding work can be performed efficiently. ,

[Brief explanation of the drawing]

The figure is a block circuit diagram of a wire feeding control device according to an embodiment of the present invention.・ 1a, 1b... Work to be welded, 2...
...Wire, 7...W, ear tract circuit, 9...Y ear short circuit detection circuit.
・

Claims (1)

[Claims] Wire short circuit detection circuits detect the contact between the wire and the workpiece that occurs when feeding the wire by inching when the wire is not in contact as an electrical short circuit, and welding is started by the signal detected by this wire short circuit detection circuit. A wire feeding control device equipped with a wire short-circuit detection circuit that pulls back the wire to an appropriate protrusion length.