JPS59183980A - Tracing device of weld line - Google Patents

Abstract

PURPOSE:To provide a titled tracing device which guides a weaving welding torch to a normal position in weld line tracing of said torch by counting lateral weaving currents to the value exceeding a reference current value and controlling the position according to the condition of the count number. CONSTITUTION:The wire 12 of a weaving torch 11 welds with the current of a welding power source 22. The current in a detecting part 25 and the signal in a position detecting part 21 enter comparing and counting parts 27R, 27L in which the reference values of setting parts 26R, 26L for reference current values are set. A discriminating part 28 discriminates vertical and lateral deviations from the count number exceeding the reference values and the condition thereof. A lateral driving part 6 and a vertical driving part 7 are drived by the command from an instructing part 29 to guide the torch 11 to the normal position. The device makes detection without contact, permits simplification and reduction in size, is unaffected by environment and has reliability without malfunction.

Description

[Detailed Description of the Invention] This invention is a device that follows a welding line while weaving a welding torch, and in particular, corrects the deviation of the welding torch with respect to the welding line by counting the points where the welding current and the reference current value match. The present invention relates to a welding line tracking device.

A conventional device of this type is shown in FIG. In the figure, + (lR) and (/L) are indicated by arrows (2).

(3) is the welding line (i.e., the workpiece (lR) and (//
(L) where we are going to weld), (G) striped welding line (3)
(3) Striped controller.

(6) is the torch left/right drive section controlled by this controller <S), (7) is the torch upper/lower drive section controlled by controller 0), (gA), (gB), (g
e) &1 controller (5) and each detection probe (z)
-Torch left/right drive section (6), torch upper/lower drive section (7)
) is the electric cable connecting the (?) is the weaving device,
(10) is a holder that holds a detection glove (ge) and a weaving device (q'), (//) is a welding torch attached to the weaving device (wa), (t2) is a welding wire, (// L) is the position of the welding torch (//) when weaving to the left, (//R) is the position of the welding torch (//)
//) is the position when weaving to the right side.

In addition, the torch left and right drive parts (B), the torch upper and lower drive parts (7), the weaving device (?), and the holder (10) are included.
) serves as a driving source for moving the welding torch (ll) when it deviates from the welding line (3).

Next, the operation will be explained. First, the object to be welded (/R) and (
/L) from the welding line (3) to weld the welding torch (l
1) is shifted using a detection glove (ri).

The detected deviation signal is sent to the controller 3- through an electric cable (gA), and the left/right or upward/downward deviation is determined by the tile. As a result, a controller deviation correction signal is sent to the torch left and right drive parts (B) and the torch upper and lower drive parts (7) through electric cables (gB) and (gc), respectively. This deviation correction signal causes the torch left and right drive parts (6) to
The left and right positions of the weaving device (9), that is, the left and right positions of the weaving center of the welding torch (ll) are corrected, and the torch upper and lower drive parts (7) are also adjusted to the upper and lower positions of the weaving device (9). Correcting the lower position, that is, the upper and lower positions of the welding torch (ti) Conventional equipment of this type is configured as described above, so in order to avoid the effects of arc heat, light, and spatter, the detection probe is placed in the position where the arc is generated. It has to be installed ahead of the current position, and as a result, there is a disadvantage that detection accuracy decreases due to misalignment between the detection probe installation position and the arc generation position, and a delay circuit is required, resulting in poor durability. There were drawbacks. Furthermore, since a detection probe is required, the device is complicated and expensive.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by counting the points where the welding current and the reference current value match and correcting the deviation of the welding torch from the welding line, This eliminates the need for a probe, which simplifies and downsizes the device, making it suitable for welding in narrow spaces.
The purpose of the present invention is to provide a weld line tracking device that can prevent deterioration in detection accuracy and durability even under adverse environments such as snow ivy.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (/R), (/L), (,?), (Otsu).

(7), (9), (10), (//), (zlR), (
zlR) and (/2) are the same as explained in FIG. (21) is a position detector attached to the weaving device (wa) to detect the weaving position of the welding torch (it), (,2U) is the welding power source, (,!,?) is this welding power source, (, 22) Current l of the welding current flowing to the welding torch (//) from the age, (2
(2t) is the detection unit that detects the welding current, (2xR) and (xxL) are the reference current value setting units that preset the reference current value on the right and left sides of the weaving, respectively. Near R) and (Near L) detect the welding current on the right side and left side of weaving, respectively, based on the position signal sent from the position detector (,2/) (25).
The welding current taken in and taken from the right side, respectively.
Reference current value setting section on the left (,2/,R), (,2A
A comparison and counting section that compares the reference current value set by L) and counts the points where both match, (,2g)
is a comparison between the right side and the left side, and a determination unit that determines whether the welding torch (ll) is left or right, or upward or downward, with respect to the welding line from the counts of the count units (, 27R) and (, 27L), (29) is a deviation correction signal to the torch left/right drive unit (B) or the torch upper/lower drive unit (RI) to move the weaving device (q) and eventually the welding torch (ll) according to the discrimination signal from the discrimination unit (, 2 &). This is the command part that sends the command.

Next, the operation of the weld line tracking device of the present invention will be explained. First, a weaving device (wa) causes the welding torch (//) to weave, that is, periodically move repeatedly from left to right in a plane perpendicular to the welding line (3). welding torch (
When weaving ll) in this way, the welding wire (l) of the welding torch (it) and the workpiece welded (l) are weaved in this way.
As is clear from FIG. 2, the distances from lR) and (llL) change periodically, and therefore the welding current flowing through the current path (23) of the welding torch (ll) also changes. This welding current is detected by the detection part (2 left) and
7R) and (2?L), and the comparison/counting section (h7L) on the left side calculates the detected welding current by the position signal sent from the position detector (,2/). Of these, the welding current on the left side of the weaving is taken in, compared with the reference current value on the left side, and the points where the two match are counted. Similarly, based on the position signal sent from the position detector (Xt), the comparison/counting section (2?R) on the right side takes in the welding current on the right side of weaving among the detected welding currents, and calculates the welding current on the right side. Compare with the value and count the points where both match. If we refer to Figure 3, which shows the relationship between the change in welding current and the reference current value (when the reference current values on the left and right sides are set to be the same) for sinusoidal weaving, the waveform (A) is Waveform (B) shows the welding current when there is no deviation from the welding line (3), and waveform (B) shows the welding current when there is deviation from the welding line (3) to the left. Therefore,
With respect to the welding current of waveform (A), both the comparison/count section (27L) on the left side and the comparison/count section (27R) on the right side exhibit a count value during the weaving half cycle.

However, with respect to the welding current of waveform (B), the comparison/counting part (27L) on the left side exhibits a curvature, whereas the comparison/counting part (27R) on the right side exhibits a count O.

The discrimination part (, 2g) is the comparison/counting part (, 27L) on the left side.
) count and the comparison/count section on the right side (,27R
) is used to determine left, right, upper, and lower shifts, and generates a discrimination signal that determines, for example, "no shift" for waveform (A), and for "leftward shift" for waveform (B). ing"
A discrimination signal is generated based on the discrimination.

This discrimination signal is supplied from the discrimination section (2g) to the instruction section (2q). Therefore, the command part (, 29) is the welding torch (/
For details, see the drive source for moving the torch left and right drive parts (
(B) or sends a deviation correction signal to the torch upper/lower drive unit (7) to correct the deviation of the welding torch (//) with respect to the welding line (3). For example, for the waveform (B), the instruction part (C9)
sends a misalignment correction signal to the torch left and right drive parts (B) to move the welding torch (/l) to the right.

Figure 3 shows the counts, determinations and commands resulting from the comparison of welding current and reference current values.

Although the above embodiment describes the case where the reference current value on the left and right sides is set to the same value, the reference current value may be set to different values on the left and right sides. This is effective when it is necessary to shift the aiming position of the welding torch from the line.

In addition, although the above example shows the case of downward butt welding,
It is equally effective for butt welding in other positions (horizontal, vertical, upward) and fillet welding in all positions.

As described above, according to the present invention, the deviation is determined by counting the points where the welding current and the reference current value match on each of the left and right sides of the weaving, so that the following effects are achieved.

/ Can detect welding lines without contact.

The device is simple, compact, and inexpensive, and can be applied to narrow welding areas.

3. Even under adverse environments such as heat, light, and spatter that are typical of arc welding, there is no decrease in accuracy or durability.

It is possible to follow the weld line without malfunction or loss of accuracy even with the noise typical of arc welding and the welding current with large instantaneous fluctuations.

S It is also effective when there is an asymmetrical groove or when it is necessary to shift the aiming position of the welding torch from the welding line.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional welding line tracking device, and FIG. 2 is a two-part block diagram showing an embodiment of the present invention.
Figure 3 is a diagram showing the relationship between changes in welding current and reference current value,
FIG. q is an explanatory diagram showing the deviation detection 1 determination and command according to the present invention. (/l)...Welding torch, (?)...Weaving running part, (2R) and (,27L)...Comparison/counting part, (
,2,m) Discrimination part, (,1,?)...Instruction part, (6)...
・Torch left and right drive parts, (7)...Torch upper and lower drive parts. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 3 Figure 4 Procedural amendment “Voluntary” Mr. Commissioner of the Patent Office 2, Name of the invention Welding line tracking device 3, Representative of the person making the amendment Hitoshi Katayama Department 4, Agent 6, Amendment Contents (1) The description of "arc heat" on the third line of the second page of the specification is corrected to "arc heat." (2) 1 (l/R) on the third line of page S of the specification, (
/ /L) Delete the description of J. (3) “(//R)” on the 13th to /da lines on page 6 of the specification
, (//L) is the distance from Figure 2" to "(/R),
(/L) as shown in Figure 1. (4) Submit Figure 3 in which the description of "reference voltage value" has been corrected to "reference current value." 375- Tumor 3 Diagram R

Claims (1)

[Claims] A device for following a welding line while weaving a welding torch, which includes a detection unit that detects the welding current flowing in the welding torch, and a detection unit that is connected to the output side of the detection unit and detects the welding current on each of the left and right sides of the weaving. A comparison/counting section that compares a predetermined reference current value and counts the points where the two match, and a comparison/counting section that is connected to the output side of these comparison/counting sections and calculates the left side of the welding torch for the welding line from those counts. The welding torch is provided with a discrimination section for discriminating a rightward deviation or an upward/downward deviation, and a command section connected to the output side of this discrimination section and sending a deviation correction signal to a drive source for moving the welding torch according to the discrimination signal. A welding line tracking device featuring: