JPS59166380A - Ending method of consumable electrode type arc welding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for terminating consumable electrode type arc welding, in particular, stopping the feeding of the welding wire forming the consumable electrode at the same time as the welding of the workpiece is completed, and within a predetermined anti-stick time. The present invention relates to a method for terminating consumable electrode arc welding in which a voltage is applied to ignite the wire.

In consumable electrode arc welding, a welding voltage is applied between a consumable electrode welding wire and a workpiece to generate arc discharge, and the workpiece is welded using the arc heat.

FIG. 1 shows such arc welding and a timing chart at the end of this welding. During welding, a torch signal is output and a predetermined welding voltage is applied between the welding wire and the workpiece. Arc discharge is generated between the wire and the workpiece.

Simultaneously with the completion of the arc welding, the feeding of the wire is stopped and the application of the welding voltage is turned off.

However, even if you stop feeding the wire at the same time as welding ends,
The wire continues to be fed for a predetermined period of time due to the inertia of the wire feeding motor, and as shown in Figure 2 (a), the tip of the wire plunges into the object to be welded and welds to the object to be welded. Unable to restart welding smoothly.

Therefore, in conventional arc welding, when the torch No. 16 is turned off and welding is completed, a voltage for flaming the wire 12 is applied between the wire 12 and the workpiece for an anti-stick time T. With this voltage,
Even when the shear wire 12 is fed by the inertia of the wire feeding motor, the wire 12Vi# melts. Then, just like during the main bath welding, this flare-up voltage melts the wire 12.
The weld @14Fi formed at the tip, the short circuit between the wire 12 and the object 10 to be contacted, and arc regeneration are repeated, and the wire moves to the object 10 to be contacted. Finally, Figure 2 (
, b), welding can be completed without the wire 12 welding to the workpiece 10.

However, in the conventional arc welding shaft method as described above, the anti-stick time T
Since the wire 12 is continuously applied with a voltage that causes it to flare up, the following problems occur. When focusing on the situation just before the anti-tick time T, for example, when the short circuit is broken and the arc is regenerated and the anti-stick time ends at the same time, a droplet forms at the tip of the wire 12 as shown in Figure 2 (C). Not formed. However, the probability of this happening is low;
Normally, there is a time difference after the short circuit is broken and the arc is regenerated, but
After the wire flare voltage is applied, the anti-stick time ends. Therefore, as shown in FIG. 2(a), welding is often completed with the arc 100 generated and the wire 12 melted to form a large bath hζ14 until the end of the anti-stick time. If the droplet 14 is formed at the tip of the wire in this way, a problem arises in that the arc is not generated smoothly when the next welding starts.

The present invention has been made in view of these conventional problems, and its purpose is to perform the flare-up of the wire at the end of arc welding without forming an M/M at the tip of the wire, and to It is an object of the present invention to provide a method for terminating consumable electrode type arc welding, which makes it possible to smoothly restart the single welding performed thereafter.

To achieve this objective, the method of the present invention stops the feeding of the consumable electrode welding wire at the same time as the welding of the workpiece is completed, and within a predetermined anti-stick time, the wire flare-up generates 9 voltage between the wire and the workpiece. In a method for terminating consumable electrode arc welding, an arc generated between a wire and a workpiece is detected, and when the arc occurs, the wire flare-up voltage is forcibly turned off for a predetermined short period of time. It is characterized by

Next, preferred embodiments of the present invention will be described based on the drawings.

FIG. 3 shows a timing chart showing a preferred embodiment of the method for terminating consumable electrode type arc welding according to the present invention. At the same time as the torch signal is turned off, the feeding of the consumable electrode welding wire 12 is stopped, and the wire! The wire 12 is removed within a predetermined amplifier stick time T from the time when the feeding of the wire 12 is stopped.
A wire flare voltage is applied between the wire burnout voltage and the workpiece 10 to be welded.

The characteristic feature of the present invention is that the wire 12 and the W to be welded
The purpose is to detect an arc 100 that occurs between The purpose is to make it possible to burn out the wire without forming a droplet 14 at the tip of the wire 12.

That is, according to the present invention, the short circuit between the welded object @ 10 and the wire 12 is broken within the anti-stick time T, and the arc 100 is generated between the wire 12 and the welded object 10, and at the same time, the wire 12 and the S welded Turn off the wire flare voltage applied between the
Preventing occurrence.

For this reason, if we pay attention just before the end of the anti-stick time, even if the short circuit is broken, the arc 100 is instantly cut off, so the wire does not melt and a droplet 14 is not formed at the tip of the wire, as shown in Fig. 2(e). The anti-stick time ends in this state.

Therefore, according to the arc welding termination method of the present invention, the burning of the wire 12 at the end of the arc welding can be reduced by
2 can be finished in a sharp state without forming a bath rm 14 at the tip, and even when arc welding is restarted after that, the arc start can be performed extremely smoothly.

Note that the off time of the wire flare voltage, which is turned off when an arc occurs between the wire 12 and the welded object 10, may be set to a predetermined constant time, and the wire 12 and the welded object may be The wire flare voltage may be turned off until the short circuit with lO occurs again.

Further, in the above embodiment, the wire flare-up voltage was set to be equal to the welding voltage of the workpiece 10, but the present invention is not limited to this. For example, as shown in FIG. The fifth embodiment shows a preferred embodiment of an apparatus to which the arc welding termination method of the present invention is applied, and this apparatus is similar to the third embodiment. It is formed so that arc welding is completed according to the timing chart shown in the figure.

That is, at the same time that welding of the workpiece 10 is completed, the torch signal is input to the anti-stick time setting device 20,
A command signal for applying a wire burnout voltage is input from the anti-stick time setting device 20 to the drive circuit 24 via the noise generating circuit 22 for a predetermined anti-stick time T. When such a wire flare voltage application command signal is input, the drive circuit 24 drives the output control section 28 that controls the output of the power source 26, and the workpiece 10
A wire flare voltage is applied between the object to be welded IO and the wire 112 so that the wire 12 is not welded.

In this way, the short circuit of the wire 12 that was short-circuited to the workpiece 10 is broken, and as shown in FIG. 2(d), for example, the wire 12 and the workpiece are connected! When an arc 100 occurs between the arc 100 and the arc 100, the arc occurrence detection circuit 30 detects the occurrence of the arc 100, and this detection signal is input to the no-9 pulse generation circuit 22. Here, arc occurrence detection IoJ path 3
Detection of arc occurrence by
This is done by detecting the voltage between 2 and 2. That is, this arc occurrence detection circuit 30 is set to the reference voltage E in advance.

is connected, and when the voltage between the workpiece 10 and the wire 12 exceeds this reference voltage gB, it is determined that an arc has occurred between the two, and the pulse generation circuit 22 detects an arc. Outputs a detection signal.

When the arc generation detection signal is thus inputted, the noguru generation circuit 22 outputs a voltage suppression pulse having a constant time width represented by ΔT to the drive circuit 24. When such a voltage suppression pulse is input, this drive circuit 24
As shown in FIG. 3, the wire flare-up supplied from the power source 26 to the wire 12 and the workpiece 10 by driving the output control unit 28 forcibly turns off the Di pressure for a period of ΔT during which the voltage suppression pulse is output. .

By doing this, in the apparatus of the embodiment, the burnout voltage of the wire 12 is applied between the wire 12 and the workpiece 10 at the same time as the welding of the workpiece 10 is completed, and the wire 12 is applied to the workpiece 10. 12 can be prevented from being welded, and if the short circuit of the wire 12 is broken and an arc is generated between the wire 12 and the workpiece 10, the wire burnout voltage is forcibly turned off for a predetermined short time. be able to.

Therefore, in the apparatus of the embodiment, the workpiece 10 is
It is possible to finish the wire 12 in a sharp state without welding the wire 12 to the tip and without forming a weld tank 14 at the tip of the wire 12, and it is possible to smoothly resume welding to be performed later. Become.

As explained above, according to the present invention, an arc occurring between a wire and a workpiece is detected, and when the arc occurs, the wire flare voltage is forcibly applied for a predetermined short period of time. By turning off the anti-stick time, melting of the wire immediately before the end of the anti-stick time is suppressed, so that the anti-stick time can be ended without forming a droplet at the tip of the wire. Therefore,
According to the present invention, when welding is restarted after completion of welding, it is possible to restart welding very smoothly.

[Brief explanation of the drawing]

Fig. 1 is a timing chart diagram showing a conventional consumable electrode type arc welding termination method, ii) Fig. 2 is an explanatory diagram showing the termination operation of arc welding, and Fig. 3 is a timing chart diagram showing a preferred embodiment of the present invention. , FIG. 4 is a timing chart showing another embodiment of the present invention, and FIG. 5 is a block diagram showing a preferred embodiment of an apparatus to which the method of the present invention is applied. In each figure, the same members are given the same reference numerals, and 10 is the object to be bathed;
12 is a consumable electrode welding wire, and 100 is an arc welding wire. Agent Patent attorney Makoto Kuzuno - (1 other person) Figure 1, Figure 2, Figure 3, Figure 4, Procedure amendment (voluntary) 1. Indication of the incident Patent application No. 58-41812 2,
Name of the invention: Method for terminating consumable electrode type arc welding 3, Person making the amendment Representative: Hitoshi Katayama Department 4, Agent 5, Subject of the amendment

Claims (1)

[Claims] +11 A consumable electrode type arc that stops feeding the consumable electrode welding wire at the same time as the welding of the object to be welded, and applies a wire flare-up voltage between the wire and the object to be welded within a predetermined anti-stick time. A method for terminating welding that detects an arc occurring between a wire and a workpiece, and when the arc occurs, the wire burnout voltage is forcibly turned off for a predetermined short period of time. How to finish electrode arc welding. (2. In the method described in claim (1), when an arc occurs between the wire and the workpiece, the wire flare-up forcibly turns off the stain pressure, and then the wire and the workpiece are A method for terminating consumable electrode type arc welding, characterized by turning on the wire flare-up voltage when a short circuit occurs.