JP2003170284A - Laser beam welding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser beam welding apparatus capable of obtaining a welded zone with high quality even if a zone to be welded has errors in a groove shape such as a gap or a step. <P>SOLUTION: The apparatus is provided with a storage means 11 for storing fundamental welding conditions according to the plate thickness such as laser output, welding speed and weaving amplitude for each weld line, and a selecting means 17 for selecting a welding line for welding. The means 11 stores a control amount of a weaving amplitude according to an error in the groove shape for each fundamental welding condition. The control amount of the weaving amplitude according to the fundamental welding condition of the welding line selected by the means 17 and the data detected by an error detecting means 5 is selected from the means 17. Welding is carried out for each welding line on the basis of the fundamental welding condition and the control amount of the weaving amplitude. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser welding device.

[0002]

2. Description of the Related Art As a welding apparatus, there is a laser welding apparatus for irradiating a welded portion with a laser beam for welding. Since such a laser welding apparatus performs welding by irradiating a laser beam, it is possible to perform welding in a narrow portion, but has a groove shape error such as a gap amount or a step amount of a welded portion. In this case, the laser beam passes through this gap or the like and good welding cannot be performed. Therefore, in some cases, a filler wire (welding wire) is fed to the welded portion to fill the gap or the like.

However, the gaps and the like have different sizes, and if the welding wire is fed at a constant speed, when the gap or the like is relatively small, the amount of the welding wire fed may be too large, resulting in an excessive size. On the contrary, when the gap etc. is relatively large, the welding wire feed rate is too small and the joining area ratio decreases and a good bead shape cannot be obtained, and cracks may occur from this part. was there. Therefore, conventionally, it has been proposed to change the welding speed, the wire feed amount, and the like according to the gap amount and the like.

[0004]

However, if the gap amount or the like is larger than the laser beam diameter, it is difficult to cope with the large gap amount or the like even if the welding speed or the wire feed amount is controlled. It was For this reason, the materials cannot be completely joined, and there is a possibility that welding defects such as defective fusion may occur. Therefore, a method of weaving the laser beam in a direction substantially orthogonal to the welding proceeding direction is also adopted. However, in the case of weaving, if the weaving amplitude is large with respect to the gap amount and the like, the thermal influence on areas other than the welding line expands. However, there was a drawback that the materials could not be completely joined.

When the welding conditions are controlled according to the gap amount and the step amount, the amount of change in the welding conditions to be controlled varies depending on the plate thickness of the material to be joined and the joint shape, and there are a plurality of types such as structures. When an object having a plate thickness and a joint shape is welded at one time, it is necessary to have a plurality of control expressions for welding conditions, which is difficult to control. Furthermore, when controlling the welding conditions according to the gap amount and the step amount, it is necessary to measure (detect) the gap amount and the step amount. Generally, an optical type such as a laser sensor is used for this detection. become. However, this type of sensor is sensitive to the gloss state and scratches on the surface of the material and often detects an erroneous value.
If such an erroneous value is directly used for controlling the welding conditions, there is a risk of causing welding defects.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and an object thereof is to perform high quality welding even when there is a groove shape error such as a gap amount or a step amount in a welded portion. It is to provide a laser welding device capable of obtaining a portion.

[0007]

Therefore, the laser welding apparatus according to the first aspect of the present invention detects a groove shape error such as a gap amount or a step amount of a welded portion in a laser welding device capable of weaving a laser beam. Error detection means for
The weaving amplitude is controlled according to the detection data detected by the error detecting means.

In the laser welding apparatus according to the first aspect of the present invention, the weaving amplitude is controlled in accordance with the detection data (the groove shape error such as the gap amount or the step amount of the welded portion) detected by the error detecting means. With respect to the gap amount and the step amount of the welded portion to be attempted, the weaving amplitude becomes the optimum amount, so that even if the weaving amplitude has the gap or the step difference, it does not cause a welding defect such as fusion failure, A high quality weld can be formed. Moreover, it is possible to avoid irradiating a useless part with the laser beam, and it is possible to achieve energy saving.

According to another aspect of the laser welding apparatus of the present invention, the basic welding conditions such as laser output, welding speed, weaving amplitude, etc. corresponding to the plate thickness and the like are stored for each welding line, and the groove shape error is further stored for each basic welding condition. Storage means for storing the controlled variable of the weaving amplitude according to the above, and selection means for selecting the welding line to be welded. The basic welding conditions of the welding line selected by this selection means and the error detection means detect it. A control amount of the weaving amplitude corresponding to the detected data is selected from the storage means, and welding is performed for each welding line based on the basic welding condition and the control amount of the weaving amplitude.

According to another aspect of the laser welding apparatus of the present invention, the storage means stores the basic welding conditions such as the laser output, the welding speed, the weaving amplitude, etc. according to the plate thickness and the like for each welding line, and also the basic welding conditions. The control amount of the weaving amplitude corresponding to the groove shape error is stored in. When welding, the selecting means can select the welding line to be welded, and the error detecting means can detect the groove shape error such as the gap amount or the step amount of the welded portion. You can Therefore, the basic welding conditions of the welding line and the control amount of the weaving amplitude selected by the selecting means are drawn from the storage means,
Welding is performed based on the basic welding conditions and the control amount of the weaving amplitude. As a result, welding can be performed under the basic welding conditions such as laser output, welding speed, weaving amplitude, etc. according to each welding line, and the control amount of the weaving amplitude also corresponds to each welding line. Welding can be performed with the optimum weaving amplitude control amount. Therefore, the surface of the welded portion can be smoothly and beautifully finished to obtain a high quality welded portion. Also,
Since the welding line and the data corresponding to the groove shape error are selected from the preset data and the welding is performed, the processing method of this welding device can be simplified, and welding according to each welding line can be performed. It can be performed quickly and stably.

According to another aspect of the present invention, there is provided a laser welding apparatus in which the basic welding condition is a wire feed amount of a welding wire, and at least one of a wire feed amount, a laser output, and a welding speed is selected according to a groove shape error. It is characterized by further controlling one.

In the laser welding apparatus of the third aspect, since the wire feed amount, the laser output, and the welding speed are further controlled according to the groove shape error, a higher quality welded portion can be formed. . That is, by adjusting the wire feed amount, the laser output, the welding speed, etc., these can be set to the optimum amounts according to the groove shape error, and the joint area ratio in the gap etc. can be increased, Excessive overfilling can be prevented, contributing to wire material and energy savings. Further, for the step, it is possible to adjust the bead shape by adjusting control amounts such as the weaving amplitude and the wire feed amount, and it is possible to perform laser welding with a beautiful bead shape.

According to a fourth aspect of the present invention, the laser welding apparatus is characterized in that the detection data used for the control is statistically processed and the weaving amplitude is controlled in accordance with the statistics.

In the laser welding apparatus according to the above-mentioned claim 4, the detection data is statistically processed and the weaving amplitude is controlled in accordance with this statistic. Therefore, exceptional data deviating from this statistic is used. It is possible to avoid controlling the weaving amplitude. Thereby, stable welding can be performed according to the groove shape error, and a high quality welded portion can be obtained. Moreover, even if an optical sensor such as a laser sensor is used as the data detection means (error detection means) and an incorrect value is detected in response to the gloss or scratches on the material surface, such a value is detected. , Can be removed as an exceptional value (data) outside the statistics.
Therefore, even if such a laser sensor or the like is used as the error detecting means, the weaving amplitude can be stably controlled, and the cost can be reduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the laser welding apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a laser welding apparatus of the present invention.
This laser welding device comprises a weaving device 1 into which a laser beam (laser beam) L for welding from a laser oscillator (not shown) enters, and a filler wire (welding wire) 3 to a welded portion 2.
A filler wire feeding device 4 for feeding the wire, an error detecting means 5 for detecting a groove shape error of the welded portion 2, and the like. Here, the groove shape error refers to a gap amount or a step amount of the welded portion 2. Further, the gap amount is a gap size S of the gap formed between the works W to be joined as shown in FIG. 3, and the step amount is the work to be joined as shown in FIG. It is a step size D of a step formed between W and W.

The weaving device 1 includes first and second laser scanning mechanisms 6 and 7. Each of the first and second laser scanning mechanisms 6 and 7 is provided with a mirror that reflects the welding laser light (laser beam) L, a motor that rotates the mirror, and the like, and the mirror is within a predetermined angle range. The laser beam 2 is scanned by rocking. in this case,
For example, if the angle of the mirror of the first laser scanning mechanism 6 is changed, the laser beam L emitted from the laser irradiation nozzle 8 (provided below the weaving device 1) to the welded portion 2 is: The irradiation position moves in the direction perpendicular to the welding progress direction (orthogonal direction).
When the angle of the mirror of the laser scanning mechanism 7 is changed, the irradiation position of the laser beam L moves in the direction parallel to the welding proceeding direction. In addition, in FIG. 1, the arrow X has shown the welding advancing direction.

When the weaving device 1 is used in this manner, the laser beam L can be weaved (scanned) at the welding position by swinging the mirror thereof. That is, as shown in FIG. 6, the miracle K of the laser beam L with respect to the welding traveling direction X draws a so-called sine curve. Also, the weaving device 1
The weaving amplitude B can be changed by changing the angles of the mirrors of the first and second laser scanning mechanisms 6 and 7.

The filler wire feeding device 4 has a wire feeding nozzle 9 attached to the irradiation nozzle 8, and the welding wire 3 is oblique to the welded portion 2 via the wire feeding nozzle 9. It is sent from above. The wire feeding amount of the welding wire 3, that is, the feeding speed of the welding wire 3 can be changed as described later. further,
The error detecting means 5 is composed of, for example, an optical system sensor such as a laser sensor. In this case, the error detecting means 5
If the groove shape error is arranged on the front side (front side) of the irradiation position (processing point) of the laser beam L, and the groove shape error is the gap amount, the gap size S is detected, and the groove shape error is the step amount. For example, the step size D is detected.

By the way, the control unit 1 of this laser welding apparatus
As shown in FIG. 2, 0 indicates a welding condition storage unit (storage means).
11, an operation program storage unit 12, a sensor information storage unit 13, a calculation memory 14, a calculation unit 15, a control command unit 16 and the like. The control unit 10 can be composed of, for example, a microcomputer.

In the welding condition storage section 11, the welding lines A1, A
The basic welding conditions such as laser output, welding speed, wire feed amount, weaving amplitude B, etc. for each 2 (see FIG. 3) are stored. That is, the basic welding conditions differ depending on the plate thickness, the joint shape, etc., and have a plurality of types (a plurality of sets). For example, as shown in FIG.
w), the welding speed is 2 (m / min), the wire feed rate is 1 (m / min), and the weaving amplitude (weave) B is 1.0 (mm). And the condition when the gap amount and the step amount are 0) No. 1 is stored as the condition number. 2 to Condition No. It stores a plurality of data such as N. Where N
Is an arbitrary number and can be changed freely.

Further, each condition No. 1 to condition No. In N, as shown in FIG. 5, in addition to the basic welding conditions, the gap amount (for example, 0.2 mm, 0.5 mm, 1.0 mm,
A laser output corresponding to 1.5 mm), a welding speed, a wire feed amount, and a control amount of a weaving amplitude (weave) B are also attached. That is, in the condition 1, the gap amount is 0.2 mm.
In the case of, the laser output, the welding speed, and the weaving amplitude B are the same as the basic welding conditions, but the wire feed amount is 30%.
If the gap is increased to 0.5 mm, the laser output will be 1
0 (kw), welding speed 3 (m / min), wire feed rate increased 50%, weaving amplitude B 1
When the gap amount is increased by 0% and the gap amount is 1.0 mm, the laser output is 10 (kw), the welding speed is the basic welding condition, the wire feed amount is increased by 80%, and the weaving amplitude B is 3%.
When the gap amount is increased by 0% and the gap amount is 1.5 mm, the laser output is 12 (kw), the welding speed is the basic welding condition, the wire feed amount is increased by 90%, and the weaving amplitude B is 5
It is increasing by 0%. Further, when the step amount is 0.5 mm, the laser output, the welding speed, and the weaving amplitude B are the same as the basic welding conditions, but the wire feed amount is increased by 5%, and the step amount is 1.0 mm and 1. In the case of 5 mm, the laser output, the welding speed and the weaving amplitude B are the same as the basic welding conditions, but when the wire feed amount is increased by 10% and the step amount is 2.0 mm, the laser output and the welding speed are Is the same as the basic welding conditions, but the wire feed amount is increased by 12% and the weaving amplitude B is increased by 10%.

The operation program storage unit 12 also stores data on the operation of the apparatus, that is, where to move and what welding conditions are used for welding. For example, in FIG.
When welding four workpieces W ... As shown in Fig. 1, first, this device is set at the position of P1 (position where the laser beam L can be irradiated), and welding is started from the position of P1 at the welding line A1. The welding is performed up to the position of P2 under the welding conditions corresponding to, and from the position of P2 to the position of P3 under the welding conditions corresponding to the welding line A2.

Next, the sensor information storage unit 13 receives and stores the detection data of the gap amount and the step amount from the error detecting means 5. Further, the calculation unit 15 receives information (data) from the welding condition storage unit 11, the operation program storage unit 12, the sensor information storage unit 13 and the like, and uses the calculation memory 14 to calculate the wire feed amount and the wire feed amount. The weaving amplitude B etc. is determined. Then, the control command unit 16 causes the weaving device 1, the wire feeding device 4, etc.
The control amount determined in 5 is commanded. In addition, the calculation unit 15 includes a selection unit 17 that selects the welding line A, and each control amount according to the selected welding line A is determined.

Next, a method for welding the workpieces W shown in FIG. 3 by using the laser welding apparatus configured as described above will be described. In this case, welding is performed from P1 to P2 through P3. Therefore, first, an operation program is created. The operation program is, as shown in FIG.
"Move to P1" in step S1, "Start welding with welding condition No. 1" in step S2, "P2 in step S3"
“Move to”, “Start welding at welding condition No. 2” in step S4, “Move to P3” in step S5, and “End” in step S6.

The above welding condition No. 1 is the work W1,
The laser output, the welding speed, etc. corresponding to the plate thickness t1 of W1 are set under the welding condition No. 2 is the plate thickness t of the works W2 and W2
2 is laser output, welding speed, etc. This welding condition No. 1, No. 2 is stored in the welding condition storage unit 11. In this case, as shown in FIG.
1, No. 2 shows the basic welding conditions in which the gap amount and the step amount are 0, the laser output, the welding speed, the wire feed amount, and the change amount of the weaving amplitude B (control amount) according to the gap amount and the step amount of a plurality of types. ) Is attached.

Then, the operation program stored in the operation program storage unit 12 is executed. In this case, the calculation unit 15 executes the operation program in step S of FIG.
As shown in 7, the data is read step by step. That is,
The welding line A is selected by the selection means 17, one step is read as shown in step S7 of FIG. 7, and it is determined in step S8 whether or not an end command has been issued. Next, if it is "end", the process is ended as it is, and if it is not "end", the process proceeds to step S9, and it is determined whether or not a welding condition command is issued. If it is not a welding condition command, the process returns to step S7, and if it is a welding condition command, the process proceeds to step S10. In this step S10, the welding condition No. Is stored in the calculation memory 14, and the process returns to step S7. As a result, which welding condition is currently being used for welding is stored in the calculation memory 14.

Then, while grasping the current welding conditions, the weaving amplitude B according to the flow chart shown in FIG.
And control the wire feed rate. That is, step S
As shown in FIG. 11, the gap amount from the sensor information storage unit 13,
The amount of level difference (detection data) is read, and it is determined in step S12 whether or not this detection data is a sufficient number of data for statistical processing. Here, the number of data sufficient for statistical processing is the number for which reliable statistics can be taken as data, and if it is too large, the accuracy will improve, but if it is too large, it will take time for the arithmetic processing. , Can be arbitrarily set according to the material of the work W, the application after welding, and the like.

When the number of data is sufficient for statistical processing in step S12, the process proceeds to step S13 and statistical processing is performed to determine the gap amount and step amount of the welded portion 2. If the number of data is not sufficient for statistical processing in step S12, the detection data is read until the number of data reaches a sufficient number.

Next, the process proceeds to step S14, in which the welding condition No. Read the applicable welding conditions from. Then, in this step S14, the control amount such as the weaving amplitude B is determined from the detection data determined in the above step S13. After that, the process proceeds to step S15, the control amount determined in step S14 is output to the weaving device 1 and the wire feeding device 4, and welding is performed with these control amounts. And step S
In 16 it is judged whether the welding is finished, and if it is finished,
If this welding work is completed and is not completed, step S
Return to 11.

As described above, in the above welding apparatus, the weaving amplitude B and the like can be controlled according to the gap amount and the step amount while detecting the gap amount and the step amount.
Even if there are gaps or steps, it is possible to form a high-quality welded portion without causing welding defects such as poor fusion.
Moreover, it is possible to avoid irradiating a useless part with the laser beam, and it is possible to achieve energy saving. Then, for the step, it is possible to adjust the bead shape by adjusting the control amount such as the weaving amplitude B and the wire feed amount,
Laser welding with a beautiful bead shape can be performed. That is, when there is a step between the works W and W,
If weaved, as shown in FIG. 9, the weld surface 2
0 finishes smoothly, but without weaving, an edge portion 21 is formed on the weld surface 20 as shown in FIG. 10, and the finish is not beautiful.

Further, in this welding apparatus, the wire feeding amount, the laser output, the welding speed, etc. can be adjusted, and these optimum amounts can be set in accordance with the groove shape error, and the joining area in the gap etc. The rate can be increased and excess overfill can be prevented, which contributes to the saving of wire material and energy. Further, since the welding line A and the data corresponding to the groove shape error thereof are selected and welded from the preset data, it is possible to simplify the processing method of this apparatus, and to weld each welding line A. The corresponding welding can be performed quickly and stably.

Further, in this welding apparatus, as shown in FIG. 8, the weaving amplitude B is controlled in accordance with the statistical processing of the detected data, so that an exceptional value outside of this statistics is obtained. It is possible to avoid controlling the weaving amplitude B based on such data. As a result, stable welding can be performed according to the groove shape error, and a high quality welded portion can be obtained. Further, even if an optical sensor such as a laser sensor is used as the data detecting means 5 (error detecting means) and an incorrect value is detected in response to gloss or scratches on the material surface, such a value Can be removed as an exceptional value (data) outside the statistics. Therefore, even if such a laser sensor is used as the error detecting means 5, the weaving amplitude B can be stably controlled, and the cost can be reduced.

By the way, the relationship between the butt gap (gap amount) and the weaving amplitude B is preferably set as shown in FIG. That is, if the gap amount is 0, it is not necessary to perform weaving, and as the gap amount increases, the weaving amplitude B is increased so as to draw a quadratic curve. Further, the relationship between the abutting step (step amount) and the weaving amplitude B is preferably set as shown in FIG. That is, if the step amount is 0,
It is not necessary to weave, and the weaving amplitude B is increased so as to draw a quadratic curve as the amount of step difference increases.

The specific embodiments of the laser welding apparatus of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the present invention. It is possible. For example, the laser beam 2 is formed by condensing laser light output from a laser oscillator (not shown) by a parabolic mirror or the like. Therefore, when weaving, either of the scanning mechanisms 6 and 7 is used. Alternatively, the parabolic mirror itself may be swung (rotated). When welding, the work side may be moved along the welding line A or the weaving device 1 side may be moved along the welding line A. Further, in the above embodiment, the laser output, the welding speed, the wire feed amount, and the control amount of the weaving amplitude B are controlled according to the groove shape error, but at least only the control amount of the weaving amplitude B is controlled. Alternatively, one or more types can be combined and controlled. The shield gas may be supplied during welding.

[0035]

EXAMPLE As Example 1, the effect of adding a filler wire (welding wire) on the joint area ratio was investigated. In this case, a mild steel having a plate thickness of 8 mm is used as the work W, the laser output is 20 (kw), and the welding speed is 1.5 (m / mi).
n), helium (He) was used as the shield gas, and the supply amount was 50 (liter / min). Then, the works W, W are butted, and the butted gap (gap amount) is 0 mm, 0.2 mm, 0.4 mm, 0.6 m.
m, 0.8 mm, and 1 mm were examined without weaving the case where the welding wire was not fed and the case where the welding wire 3 was fed, and the results are shown in the graph of FIG. As can be seen from FIG. 13, if the gap (gap) is 0.8 mm and the welding wire 3 is not fed, the joint area ratio is reduced to about 15%, whereas the welding wire 3 is When it is sent, the joint area ratio is maintained at about 70% and the gap is 1.0 mm,
When the welding wire 3 is not fed, the joint area ratio drops to 0%, whereas when the welding wire 3 is fed, the joint area ratio is maintained at about 35%. That is, if there is a gap, it is preferable to feed the welding wire 3, and as the gap increases, the joint area ratio decreases, but by feeding the welding wire 3,
It can be seen that the reduction rate can be reduced.

As Example 2, the effect of the weaving amplitude B on the joint area ratio was examined. Also in this case, as in the case of the first embodiment, mild steel having a plate thickness of 8 mm was used as the work W, and the laser output, the welding speed, and the shield gas supply amount were the same as those of the first embodiment. Then, with respect to each butt gap (gap amount), the case of not weaving and the case of weaving were examined, and the results are shown in the graph of FIG. The weaving amplitude B when weaving is 1.5 mm. This Figure 1
As can be seen from 4, if the gap is 0.8 mm,
When not weaving, the joint area ratio is 15
When weaved, the joint area ratio remains around 80% and the gap is 1.0m.
If it is m, the bonding area ratio drops to 0% without weaving, whereas the bonding area ratio maintains about 50% when weaving. That is, if there is a gap, weaving is preferable, and the bonding area ratio decreases as the gap increases, but it can be understood that the weaving can reduce the decrease ratio.

Next, as Example 3, the effects of the weaving amplitude B and the addition of the welding wire on the joint area ratio were examined. Also in this case, as in the case of Example 1, mild steel having a plate thickness of 8 mm was used, and the laser output, welding speed, and shield gas supply amount were also the same as in Example 1. Then, for each butt gap (gap amount), weaving is performed with the weaving amplitude B set to 1.5 mm,
When the welding wire 3 is not fed and when the wire feeding amount is 2.
The case where the welding wire 3 was supplied at 3 (m / min) and the case where the welding wire 3 was supplied at a wire feed rate of 3.5 (m / min) were examined, and the results are shown in FIG.
It is shown in the graph of FIG. As you can see from this Figure 15,
If the gap is 1.0 mm and the welding wire 3 is not fed, the joint area ratio is reduced to about 50%, while the wire feeding amount is 2.3 (m / min). In this case, when the bonding area ratio is maintained at about 70% and the wire feed rate is 3.5 (m / min), the bonding area ratio is 80%.
Maintain the rank. That is, if there is a gap, it is preferable to feed the welding wire 3 and weave it, and as the gap increases, the joint area ratio decreases, but by feeding the welding wire 3 and weaving it It can be seen that the rate can be reduced.

From Examples 1 to 3 above, when there is a gap, it is preferable to add the welding wire 3 rather than not to add it, and it is more preferable not to weave it, and it is most preferable to add the welding wire 3 and weave it. Can be said. Moreover, it can be said that it is preferable to control (change) the supply amount of the welding wire 3 and the weaving amplitude B according to the gap amount and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a laser welding apparatus of the present invention.

FIG. 2 is a simplified block diagram of a control unit of the laser welding device.

FIG. 3 is a schematic perspective view showing a work to be welded by the laser welding device.

FIG. 4 is a simplified block diagram of an operation program of the laser welding device.

FIG. 5 is an explanatory diagram of data in a welding condition storage unit of the laser welding device.

FIG. 6 is an explanatory diagram of weaving of the laser welding device.

FIG. 7 is a flowchart showing a welding method of the laser welding device.

FIG. 8 is a flowchart showing a welding method of the laser welding device.

FIG. 9 is a cross-sectional view of a work piece welded by the laser welding device.

FIG. 10 is a sectional view of a work piece welded by a conventional laser welding apparatus.

FIG. 11 is a graph showing a relationship between a gap amount and a weaving amplitude.

FIG. 12 is a graph showing a relationship between a step amount and a weaving amplitude.

13 is a graph showing the effect of wire addition on the joint area ratio of the laser welding apparatus of Example 1. FIG.

FIG. 14 is a graph showing the effect of weaving amplitude on the joint area ratio of the laser welding apparatus of Example 2;

FIG. 15 is a graph showing the effects of weaving amplitude and wire addition on the joint area ratio of the laser welding apparatus of Example 3;

[Explanation of symbols]

2 Welded part 3 welding wire 5 Error detection means 11 storage means 17 means of selection A welding line B weaving amplitude L laser beam

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kaoru Adachi             3-1-1 Ueno Stock Market, Hirakata City, Osaka Prefecture             Company Komatsu Manufacturing Production Technology Development Center (72) Inventor Kazuhiko Ono             3-1-1 Ueno Stock Market, Hirakata City, Osaka Prefecture             Company Komatsu Manufacturing Production Technology Development Center (72) Inventor Nobuyoshi Yamanaka             3-1-1 Ueno Stock Market, Hirakata City, Osaka Prefecture             Company Komatsu Manufacturing Production Technology Development Center F-term (reference) 4E068 BA06 CA13 CB02 CC02 CE03                       DA14

Claims (4)

[Claims] 1. A laser welding device capable of weaving a laser beam is provided with an error detecting means for detecting a groove shape error such as a gap amount or a step amount of a welded portion, and the error detecting means detects the error. A laser welding device characterized by controlling a weaving amplitude according to detection data. 2. A laser output, a welding speed according to the plate thickness, etc.
A storage unit that stores basic welding conditions such as weaving amplitude for each welding line, and further stores a control amount of the weaving amplitude according to the groove shape error for each basic welding condition, and a selection unit that selects the welding line to be welded. The control amount of the weaving amplitude corresponding to the basic welding conditions of the welding line selected by the selecting means and the detection data detected by the error detecting means is selected from the storage means, and each welding line is provided. To
The laser welding apparatus according to claim 1, wherein welding is performed based on the basic welding conditions and the control amount of the weaving amplitude. 3. The basic welding condition includes a wire feed amount of a welding wire, and the wire feed amount according to a groove shape error,
The laser welding apparatus according to claim 2, wherein at least one of a laser output and a welding speed is further controlled. 4. The laser welding apparatus according to claim 1, wherein the detection data used for the control is statistically processed, and the weaving amplitude is controlled according to the statistics.