JPS61238471A - Control device for wire extension in consumable electrode welding - Google Patents

Abstract

PURPOSE:To control similarly the wire extension for the variation in the wire diameter and welding method and to increase the working efficiency by providing the changing over means to select the correcting circuit of the detecting signal or reference signal of the welding and the correcting circuit on the control device of the wire extension. CONSTITUTION:The correcting circuits 13-15 to correct the detection signal of the welding current or to correct the reference signal and the changing over switch 16 to select adequately the correcting circuits 13-15 according to the wire diameter, welding method, etc. are provided in order to obtain the same wire extension in case of the set value of the wire extension being same even if the wire diameter, welding method, etc. are changed. The same wire extension is therefore obtd. if the set value of the wire extension be same even in case of the wire diameter, welding method, etc. being changed. Even the adjustment in the optical wire extension at the wire diameter, welding method, etc. changing time can be performed easily by the change in the set value of the wire exten sion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire protrusion length control device for maintaining a constant wire protrusion length in a welding device using a consumable electrode.

[Conventional technology]

Fig. 2 is a blow diagram showing a wire protrusion length control device in conventional consumable electrode welding; (1) is a welding machine;
2) is a torch that holds the wire (3), and (4) is a wire feed motor that rotates the drive roller (5) and feeds the wire (3). (6) is the position of the torch (2) up and down.
ξTorch up/up movement mechanism that moves, (7) is the torch up/up movement mechanism.
The motor for driving the torch up and down to operate the downward moving wJ machine (6), (8) is the base material, and (9) is the wire (3) and base material (8) supplied from the welding machine (1). A current detector that detects the welding current between A comparator that compares this reference signal αO with the welding current detection signal output from the current detector (9) and outputs a deviation signal. @ amplifies the deviation signal output from the comparator αη, and In the single wire protrusion length control device configured as described above, which is a motor drive circuit that drives the torch up/down drive motor (7), the wire feed motor (4) is driven, and the wire (3) is While feeding the welding current from the welding machine (1) to the wire (3)
Welding is performed by generating an arc between the base metal (8) and the base metal (8).

In this case, the surface of the base material (8) is not necessarily flat, nor is it necessarily located horizontally. Therefore, the distance between the torch (2) and the base metal (8) changes, and as a result, the welding current changes. As the protruding length of the wire (3) increases, the welding current decreases, and conversely, as the protruding length of the wire (3) decreases, the welding current increases. Therefore, it is necessary to keep the welding current constant.For this reason, the welding current is detected by the current detector (9), and this welding current detection signal and the reference signal α0 are compared by the comparator αD. The deviation signal output from the motor drive circuit (
2) to the torch upper/lower wJ drive motor (7), and drives the torch upper/lower drive motor (7) to move the position of the torch (2) to maintain a constant protrusion length. The welding current is kept constant.

[Problem that the invention seeks to solve]

The conventional wire protrusion length control device described above has the following problems.One is that the wire diameter can be adjusted to 1 φ0.9f.
f-kachi φ1. If you change it to Off, even if the welding current setting value and protrusion length are the same, the wire diameter becomes thicker. This causes the welding current to increase, and even if the reference signal αO is the same, the current detector ( 9) Since the output welding current detection signal also increases, the deviation signal output from the comparator αυ causes the torch (2) to rise until it reaches the same welding current as the φ0.9fl wire, so the value of the reference signal αG Even if they are the same, in reality φ0. φ1. compared to Off wire. In the case of the 8-pronged φ0.8jE1 wire, which has a longer protrusion length than the Ojl'l wire, the welding current will be smaller, contrary to the above, so the torch should be adjusted so that the welding current is the same as the φ0.9ff wire. (2) As the welding current is lowered, the protrusion length becomes shorter.Secondly, the welding method is switched to pulsed arc and short arc1.In this case, the welding current setting value and the protrusion length are the same as the first problem. Even if the actual welding current is the same, it will differ depending on the arc characteristics of the welding method, so make it the same.As a result of moving the torch (2) up and down, the protrusion length will change even if the value of the reference signal αO is the same8. In this way, with conventional equipment, the actual welding current changes due to changes in the wire diameter and welding method.
In order to obtain the same protrusion length, it is necessary to change the set value of the reference signal αQ, which is difficult to operate, resulting in poor workability and the possibility of welding defects. This invention was made to improve the above-mentioned drawbacks, and even if the wire diameter, welding method, etc. are changed, if the wire protrusion length setting value is the same, the wire diameter will be the same.

The object of the present invention is to obtain a wire protrusion length control device in consumable electrode welding that can obtain the same protrusion length regardless of the welding method or the like.

[First Means to Solve the Problem] The wire protrusion length control device according to the present invention maintains the same wire protrusion length even if the welding wire diameter, welding method, etc. change, as long as the wire protrusion length setting value is the same. In order to obtain this, a correction circuit for correcting the detection signal of the welding current or a reference signal, and a means for appropriately switching and selecting the correction circuit according to the wire diameter, welding method, etc. are provided. .

[Effect]

The correction circuit in this invention is selected by the switching means ζ according to the wire diameter and welding method, and if the wire protrusion length setting value is the same, the wire protrusion length is controlled to be the same regardless of the wire diameter and welding method. do.

[Embodiments of the invention]

FIG. 1 is a process diagram showing one embodiment of the present invention, in which (1) to (■) are the same as the conventional device described above, and (1) is the output signal of the current detector (9). φ0.9I
111 wire, correction circuit A used for correction when using the short arc welding method, α→ is φ1 similar to the above correction circuit A, correction circuit B used for correction during the On wire, pulsed arc welding method, and a9 is the correction circuit AQ3 described above. , corrected DO path BCI →
Similarly, φ1. Correction circuit C is used for correction during the OB wire short arc welding method. αQ is a switching switch that selects either correction circuit A (13) or correction circuit C (to). Correction circuit A Q3.

Correction circuit BQ4), correction circuit C (15 measures the actual welding current for the same welding current command value and protrusion length as in the case of pulsed arc welding using φ0.9fi wire, and comparator 0 from the current detector (9). The welding current detection signal output to φ
In the overhang length control device configured as described above, which has a function to correct the value to be the same as that for the 0.9ff wire and pulsed arc welding method, first the standard φ
In the case of pulsed arc welding with 0.9M wire, there is no need to correct the welding current detection signal of the current detector (9), so switch switch A8 to the left end and output it as it is to comparator I. Here, the wire diameter , l@When changing the tangent method,
For example, in the case of a seat arc with φ1.0 cod wire,
By switching the switch α・ to the right end, the command value of the welding current and the setting value of the reference signal signal are φ0.9m! 11
If it is the same as the wire pulse arc welding method, even if the actual welding current changes, the correction circuit C (to) will correct it so that the welding current detection signal will be the same size as in the case of the φ0.9fl wire and pulse welding method. Therefore, in the case of the sheet arc welding method using φ0.9ff wire to obtain the same protrusion length, select the correction circuit A (to) using the switch αG,
Also, φ1. In the case of pulsed arc welding using off-wire, the protrusion length can be similarly made the same by selecting the correction circuit Bα4 using the switching switch Sui-Sochi αG. In addition, in the above example, eight correction circuits are provided. However, the wire diameter may increase or decrease depending on the type of welding method ().

In addition, in the above embodiment, an embodiment that can cope with changes in both the wire diameter and the welding method will be described. Needless to say, when it is desired to cope with a change in either the wire diameter or the welding method, the correction circuit may be adapted to accommodate either the wire diameter or the welding method.

Further, in this embodiment, the correction circuit is provided on the welding current detection side, but on the contrary, the same effect can be obtained even if the correction circuit is provided on the reference signal side to correct the reference signal input to the comparator (6). Furthermore, in the above embodiment, the changeover switch...
The explanation has been given on the case where the wire diameter and the welding method are manually switched according to the wire diameter and the welding method. According to the invention, the detection signal of the welding current during welding is compared with a reference signal, and based on the comparison output signal, the torch position is moved so that the welding current is kept constant, and the wire protrusion length is kept constant. , the welding current detection signal is corrected or the reference signal is corrected so that even if the wire diameter, welding method, etc. change, the same wire protrusion length can be obtained if the wire protrusion length setting value is the same. A correction circuit and a means for appropriately switching and selecting the correction circuit according to the wire diameter, welding method, etc. are provided. γ Now, if the wire diameter, welding method, etc. are changed and the Cb wire protrusion length setting value is the same, This makes it easy to obtain a flat wire protrusion length, which contributes to improving welding work efficiency. In addition, the appropriate wire protrusion length N when changing the wire diameter, welding method, etc. can be easily changed by changing the wire protrusion length setting value, which contributes to improving welding quality.

[Brief explanation of the drawing]

Fig. 1 is a professional diagram showing one embodiment of this invention, Fig. 2
The figure is a block diagram of a protrusion length control device for conventional consumable electrode welding. In the figure, (1) is a welding machine, (2) is a torch, and (3) is a welding machine.
is the wire, (4) is the wire feed motor, (5) is the drive roller, (6) is the torch up/down movement mechanism, (7) is the torch up/down drive motor, (8) is the base material, (9) is the current detector, αG is the reference signal, α is the comparator, @ is the motor drive circuit, (to) is the correction circuit, α is the correction circuit B, αe is the correction circuit C1aQ is the changeover switch + J switch In addition, the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] The wire diameter, A correction circuit that corrects the welding current detection signal or corrects the reference signal so that the same wire protrusion length can be obtained even if the welding method etc. changes, as long as the wire protrusion length setting value is the same. A wire protrusion length control device for consumable electrode welding, comprising means for appropriately switching and selecting the correction circuit according to the diameter, welding method, etc.