JP2023163707A - Laser welding device, laser welding program and laser welding method - Google Patents

Abstract

To provide a laser welding device which can increase the welding quality between two metal plates where a gap exists.SOLUTION: A laser welding device according to an aspect of the present disclosure welds a first metal plate and a second metal plate. A laser welding device comprises: a processing head which emits first laser light and second laser light to a first metal plate and a second metal plate; and a control device which controls the processing head so as to weld the first metal plate and the second metal plate with the second laser light while forming a molten pool in the first metal plate with the first laser light.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a laser welding device, a laser welding program, and a laser welding method.

Various methods have been devised to improve welding quality in laser welding for joining two metal plates. For example, there is a method of forming a fused portion and then waving to fill a gap in lap welding (see Patent Document 1), a method of reducing spatter by waving in butt welding (see Patent Document 2), and the like.

JP2020-062682A Japanese Patent Application Publication No. 2021-133417

In the above-described method of performing waving after forming the fusion zone, there is a limit to the length of welding. Furthermore, in the waving in the above-mentioned butt welding, welding defects may occur due to gaps between metal plates.

One aspect of the present disclosure aims to provide a laser welding device that can improve welding quality between two metal plates in which a gap exists.

One aspect of the present disclosure is a laser welding device that welds a first metal plate and a second metal plate. The laser welding device includes a processing head that irradiates a first metal plate and a second metal plate with a first laser beam and a second laser beam; and a control device that controls the processing head to weld the first metal plate and the second metal plate using the second laser beam.

According to such a configuration, the formation of a molten pool that supplies molten metal to the welding portion and the welding of the first metal plate and the second metal plate proceed simultaneously. Therefore, the first metal plate and the second metal plate can be joined while filling the gap with molten metal without limiting the welding length. As a result, the quality of welding between two metal plates in which a gap exists can be improved.

In one aspect of the present disclosure, the control device irradiates the abutting portion of the first metal plate and the second metal plate with the second laser beam, and is located above the abutting portion of the first metal plate in the vertical direction. Alternatively, the first laser beam may be irradiated onto the region. According to such a configuration, in butt welding, the first metal plate and the second metal plate can be joined while efficiently supplying molten metal to the gap between the first metal plate and the second metal plate.

In one aspect of the present disclosure, the control device irradiates a portion of the first metal plate that overlaps with the second metal plate with the first laser beam, and welds the irradiation area of the first metal plate with the first laser beam. The second laser beam may be irradiated to areas lined up along the direction. According to such a configuration, in lap welding, the first metal plate and the second metal plate can be joined while efficiently supplying molten metal to the gap between the first metal plate and the second metal plate.

Another aspect of the present disclosure is a laser welding program used for laser welding a first metal plate and a second metal plate using a processing head that irradiates a first laser beam and a second laser beam. The laser welding program includes a computer controlling the processing head so that the first laser beam forms a molten pool on the first metal plate, and the second laser beam welds the first metal plate and the second metal plate. have it executed.

Another aspect of the present disclosure is a method of laser welding a first metal plate and a second metal plate using a processing head that irradiates a first laser beam and a second laser beam. The laser welding method includes a step of welding a first metal plate and a second metal plate using a second laser beam while forming a molten pool on the first metal plate using a first laser beam.

According to these configurations, the first metal plate and the second metal plate can be joined while filling the gap with molten metal without limiting the welding length. Improves welding quality.

One aspect of the present disclosure is a laser welding device that welds a first metal plate and a second metal plate. The laser welding device includes a processing head that irradiates the first metal plate and the second metal plate with a laser beam, and a processing head that irradiates the first metal plate and the second metal plate, and changes the irradiation position of the laser beam in a direction intersecting the welding direction. A control device that controls a processing head to weld the first metal plate and the second metal plate while forming a molten pool.

According to such a configuration, the formation of a molten pool that supplies molten metal to the welding portion and the welding of the first metal plate and the second metal plate proceed simultaneously. Therefore, the first metal plate and the second metal plate can be joined while filling the gap with molten metal without limiting the welding length. As a result, the quality of welding between two metal plates in which a gap exists can be improved.

In one aspect of the present disclosure, the control device directs the irradiation energy of the laser beam at the abutting portion of the first metal plate and the second metal plate to an area of the first metal plate located above the abutting portion in the vertical direction. The irradiation energy of the laser beam may be greater than that of the laser beam. According to such a configuration, in butt welding, the first metal plate and the second metal plate can be joined while efficiently supplying molten metal to the gap between the first metal plate and the second metal plate.

In one aspect of the present disclosure, the control device controls the irradiation energy of the laser beam in a first region of the overlapped portion of the first metal plate and the second metal plate to the irradiation energy of the laser beam in a second region around the first region. It may be greater than the irradiation energy. According to such a configuration, in lap welding, the first metal plate and the second metal plate can be joined while efficiently supplying molten metal to the gap between the first metal plate and the second metal plate.

Another aspect of the present disclosure is a laser welding program used for laser welding a first metal plate and a second metal plate using a processing head that irradiates laser light. The laser welding program welds the first metal plate and the second metal plate while forming a molten pool on at least the first metal plate by changing the irradiation position of the laser beam in a direction crossing the welding direction. The computer controls the machining head.

Another aspect of the present disclosure is a method of laser welding a first metal plate and a second metal plate using a processing head that irradiates laser light. The laser welding method is a process of welding a first metal plate and a second metal plate while forming a molten pool in at least the first metal plate by changing the irradiation position of the laser beam in a direction crossing the welding direction. Equipped with

According to these configurations, the first metal plate and the second metal plate can be joined while filling the gap with molten metal without limiting the welding length. Improves welding quality.

FIG. 1 is a schematic diagram of a laser welding apparatus in an embodiment. 2A is a schematic plan view showing a welding state by the laser welding device of FIG. 1, and FIG. 2B is a schematic cross-sectional view showing a welding state by the laser welding device of FIG. 1. FIG. 3 is a schematic diagram of a laser welding apparatus in an embodiment different from that in FIG. 1. 4A is a schematic plan view showing a welding state by the laser welding device of FIG. 3, and FIG. 4B is a schematic cross-sectional view showing a welding state by the laser welding device of FIG. 3. FIG. 5 is a schematic diagram of a laser welding apparatus in an embodiment different from that in FIG. 1. 6A is a schematic plan view showing a welding state by the laser welding device of FIG. 5, and FIG. 6B is a schematic cross-sectional view showing a welding state by the laser welding device of FIG. 5. 7A and 7B are schematic diagrams showing a method of adjusting irradiation energy in the laser welding apparatus of FIG. 5. FIG. 8 is a schematic diagram of a laser welding apparatus in an embodiment different from that in FIG. 1. 9A is a schematic plan view showing a welding state by the laser welding device of FIG. 8, and FIG. 9B is a schematic cross-sectional view showing a welding state by the laser welding device of FIG. 8. 10A and 10B are schematic diagrams showing a method of adjusting irradiation energy in the laser welding apparatus of FIG. 8. FIG. 11 is a schematic cross-sectional view showing a laser beam irradiation state in a laser welding apparatus in an embodiment different from FIG. 1.

Embodiments to which the present disclosure is applied will be described below with reference to the drawings.
[1. First embodiment]
[1-1. composition]
A laser welding apparatus 1 shown in FIG. 1 is an apparatus that butt-welds a first metal plate P1 and a second metal plate P2.

The first metal plate P1 and the second metal plate P2 to be processed are arranged so that their end surfaces are butted against each other. The laser welding device 1 includes a laser supply section 2, a processing head 3, and a control device 4.

<Laser supply section>
The laser supply unit 2 is a device that generates laser light and supplies it to the processing head 3. The laser supply unit 2 includes a power source and an oscillation circuit. The energy distribution pattern of the laser light generated by the laser supply section 2 is not particularly limited.

<Processing head>
The processing head 3 irradiates the joining portion between the first metal plate P1 and the second metal plate P2 from above with the laser light supplied from the laser supply unit 2. The processing head 3 is configured to be able to independently irradiate the first metal plate P1 and the second metal plate P2 with a first laser beam L1 and a second laser beam L2.

The first laser beam L1 and the second laser beam L2 are generated, for example, by dividing the laser beam supplied from the laser supply section 2 by a distribution element. As the distribution element, for example, an optical element such as a mirror having a knife edge or a prism having a mirror surface (that is, a beam splitter) can be used.

The processing head 3 individually adjusts parameters such as irradiation intensity (that is, irradiation energy), focal position, and irradiation angle of each of the first laser beam L1 and the second laser beam L2. These parameters are adjusted, for example, by controlling the output of the laser supply unit 2 and the position or direction of optical elements such as mirrors and condensing lenses provided in the processing head 3.

<Control device>
The control device 4 is configured to control the laser supply section 2 and the processing head 3. The control device 4 is configured by, for example, a computer including a processor, a storage medium such as a RAM or ROM, and an input/output section.

The control device 4 sets a profile such as the intensity of the laser light supplied by the laser supply section 2. Further, based on the laser welding program, as shown in FIG. 2A, the control device 4 forms a first molten pool M1 in the first metal plate P1 with the first laser beam L1, and a molten pool M1 with the second laser beam L2. The processing head 3 is controlled to weld the first metal plate P1 and the second metal plate P2.

The second laser beam L2 forms a second molten pool M2 to weld the first metal plate P1 and the second metal plate P2. The first laser beam L1 forms a first molten pool M1 at a position where molten metal flows into the second molten pool M2.

Specifically, as shown in FIG. 2B, the control device 4 irradiates the second laser beam L2 to the abutting portion of the first metal plate P1 and the second metal plate P2, and The first laser beam L1 is irradiated onto a region located above the abutting portion in the vertical direction.

In this embodiment, the first metal plate P1 is thicker than the second metal plate P2. Further, the first metal plate P1 and the second metal plate P2 are placed so that the thickness direction thereof is parallel to the up-down direction. Therefore, the upper surface of the first metal plate P1 is located above the upper surface of the second metal plate P2 (that is, near the processing head 3).

Furthermore, in this embodiment, the irradiation area of the first laser beam L1 is aligned with the irradiation area of the second laser beam L2 in a direction perpendicular to the welding direction D (vertical direction in FIG. 2A). Moreover, the irradiation area of the first laser beam L1 is larger than the irradiation area of the second laser beam L2.

However, the irradiation area of the first laser beam L1 may be the same size as the irradiation area of the second laser beam L2, or may be smaller than the irradiation area of the second laser beam L2. Further, the magnitude relationship between the irradiation energy of the first laser beam L1 and the irradiation energy of the second laser beam L2 does not matter. Note that the irradiation energy of the first laser beam L1 is set to a level that does not cause defects such as underfill.

In the region irradiated with the first laser beam L1, a first molten pool M1 is formed by melting the first metal plate P1. The molten metal (i.e., melt) in the first molten pool M1 moves toward the abutting portion between the first metal plate P1 and the second metal plate P2 (i.e., the gap G and the second molten pool M2) due to surface tension and gravity. Inflow.

The molten metal formed by the first laser beam L1 is distributed in an area behind the irradiation area of the second laser beam L2 in the welding direction along the flow direction F from the first metal plate P1 toward the second metal plate P2. supplied to

As a result, the molten metal supplied from the first molten pool M1 solidifies together with the molten metal in the irradiation area of the second laser beam L2 (that is, the second molten pool M2) to form a welded portion W. The weld W joins the first metal plate P1 and the second metal plate P2 while filling the gap G between the first metal plate P1 and the second metal plate P2.

In this embodiment, the irradiation area of the second laser beam L2 forming the weld W overlaps with both the abutting end of the first metal plate P1 and the abutting end of the second metal plate P2. However, the irradiation area of the second laser beam L2 may overlap only with one of the abutting ends of the first metal plate P1 and the second metal plate P2.

Further, the first metal plate P1 and the second metal plate P2 may have the same thickness. That is, the upper surface of the first metal plate P1 and the upper surface of the second metal plate P2 may be flush with each other. In this case, by tilting the first metal plate P1 and the second metal plate P2 so that the upper surface of the first metal plate P1 is located above the upper surface of the second metal plate P2, the first molten pool M1 is Molten metal can be supplied to the butt portion.

[1-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) The first laser beam L1 and the second laser beam L2 simultaneously form the first molten pool M1 that supplies molten metal to the welding part and weld the first metal plate P1 and the second metal plate P2. proceed. Therefore, the first metal plate P1 and the second metal plate P2 can be joined while filling the gap with molten metal without limiting the welding length. As a result, the quality of welding between two metal plates in which a gap exists can be improved.

(1b) By irradiating the first laser beam L1 to a region of the first metal plate P1 that is located above the abutting portion in the vertical direction, melting occurs in the gap between the first metal plate P1 and the second metal plate P2. The first metal plate P1 and the second metal plate P2 can be joined while efficiently supplying metal.

(1c) Since the first laser beam L1 forming the first molten pool M1 does not move in any direction other than the welding direction with respect to the first metal plate P1, generation of spatter is suppressed. Therefore, welding speed can be increased. Furthermore, since it is easy to understand the correspondence between processing conditions and welding results, it is relatively easy to construct a laser welding program.

[2. Second embodiment]
[2-1. composition]
A laser welding device 1A shown in FIG. 3 is a device that performs overlap welding of a first metal plate P1 and a second metal plate P2.

The first metal plate P1 and the second metal plate P2 to be processed are arranged so that at least a portion thereof overlaps in the thickness direction. The first metal plate P1 is arranged above the second metal plate P2 (that is, near the processing head 3).

The laser welding device 1A includes a laser supply section 2, a processing head 3, and a control device 4A. The laser supply unit 2 and the processing head 3 of the laser welding device 1A are the same as the laser supply unit 2 and the processing head 3 of the laser welding device 1 of the first embodiment.

<Control device>
The control device 4A has the same configuration as the control device 4 of the first embodiment except for the details of the laser welding program to be executed.

Based on the laser welding program, as shown in FIG. 4A, the control device 4A forms a first molten pool M1 in the first metal plate P1 with the first laser beam L1, and welds the first metal with the second laser beam L2. The processing head 3 is controlled to weld the plate P1 and the second metal plate P2.

The second laser beam L2 forms a second molten pool M2 to weld the first metal plate P1 and the second metal plate P2. The first laser beam L1 forms a first molten pool M1 at a position where molten metal flows into the second molten pool M2.

Specifically, the control device 4A irradiates a portion of the first metal plate P1 that overlaps with the second metal plate P2 in the thickness direction with the first laser beam L1, and irradiates the first laser beam L1 of the first metal plate P1 with the first laser beam L1. A region lined up along the welding direction D with the irradiation region of the light L1 is irradiated with the second laser light L2.

As a result, as shown in FIG. 4B, the molten metal in the first molten pool M1 is supplied along the flow direction F to the area irradiated with the second laser beam L2, and the molten metal in the second molten pool M2 is supplied to the region irradiated with the second laser beam L2. At the same time, a welded portion W is formed that penetrates the first metal plate P1 and reaches the second metal plate P2.

In FIG. 4A, the irradiation area of the second laser beam L2 is formed so as to surround the irradiation area of the first laser beam L1. Note that the second laser beam L2 may be irradiated to overlap the irradiation area of the first laser beam L1. Further, the second laser beam L2 may be irradiated only to an area in front of the irradiation area of the first laser beam L1 in the direction of progress of welding, or may be irradiated only to an area in front of the irradiation area of the first laser beam L1 in the direction of progress of welding. It is also possible to irradiate only the area.

In other words, the irradiation area of the second laser beam L2 does not necessarily have to surround the irradiation area of the first laser beam L1, nor does it need to sandwich the irradiation area of the first laser beam L1 back and forth along the welding direction. .

[2-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(2a) By irradiating the second laser beam L2 to an area of the first metal plate P1 that is lined up with the irradiation area of the first laser beam L1 and the welding direction, the first metal plate P1 and the second metal plate P2 can be separated. The first metal plate P1 and the second metal plate P2 can be joined while efficiently supplying molten metal to the gap between them.

[3. Third embodiment]
[3-1. composition]
A laser welding device 1B shown in FIG. 5 is a device that butt-welds a first metal plate P1 and a second metal plate P2. The arrangement of the first metal plate P1 and the second metal plate P2 to be processed is the same as in the first embodiment shown in FIG.

The laser welding device 1B includes a laser supply section 2, a processing head 3B, and a control device 4B. The laser supply section 2 of the laser welding device 1B is the same as the laser supply section 2 of the laser welding device 1 of the first embodiment.

<Processing head>
The processing head 3B irradiates the joining portion between the first metal plate P1 and the second metal plate P2 from above with the laser light supplied from the laser supply unit 2. The processing head 3B is configured to be able to irradiate the first metal plate P1 and the second metal plate P2 with a single laser beam L.

The processing head 3B adjusts parameters such as the irradiation intensity (that is, irradiation energy), focal position, and irradiation angle of the laser beam L. These parameters are adjusted, for example, by controlling the output of the laser supply unit 2 and the position or direction of optical elements such as mirrors and condensing lenses provided in the processing head 3B.

<Control device>
The control device 4B has the same configuration as the control device 4 of the first embodiment except for the details of the laser welding program to be executed.

The control device 4B sets a profile such as the intensity of the laser light supplied by the laser supply section 2. Further, the control device 4B changes the irradiation position of the laser beam L in a direction intersecting the welding direction D, as shown in FIG. 6A, based on the laser welding program, so that the first The processing head 3B is controlled to weld the first metal plate P1 and the second metal plate P2 while forming the molten pool M1.

Specifically, the control device 4B controls the irradiation energy of the laser beam L in the first region R1, which includes the abutting portion of the first metal plate P1 and the second metal plate P2, from the abutting portion of the first metal plate P1. Also, the irradiation energy of the laser beam L is made larger than the irradiation energy of the second region R2 located above in the vertical direction.

The control device 4B is configured such that the irradiation position of the laser beam L is set between the inside of the first metal plate P1 (that is, the region where the first molten pool M1 is formed) and the butt part (that is, the gap) between the first metal plate P1 and the second metal plate P2. The machining head 3B is controlled so as to have a "figure 8"-shaped trajectory that reciprocates between G) and G). By controlling the laser beam L in this manner, a zigzag welding trajectory intersecting the welding direction D is formed.

Further, the control device 4B changes the moving speed of the irradiation position of the laser light L in the second region R2 to the irradiation position of the laser light L in the first region R1 while keeping the output (that is, power density) of the laser light L constant. be greater than the movement speed of Thereby, the irradiation energy of the laser beam L on the inside of the first metal plate P1 becomes smaller than the irradiation energy of the laser beam L on the abutting portion. Note that the irradiation energy of the laser beam L in the second region R2 is set to a level that does not cause defects such as underfill.

As shown in FIG. 6B, the molten metal formed inside the first metal plate P1 by the laser beam L flows along the flow direction F from the first metal plate P1 toward the second metal plate P2, The light is supplied to a region behind the trajectory of the light L in the welding direction. As a result, the molten metal supplied from the first molten pool M1 solidifies together with the molten metal of the second molten pool M2 formed at the abutting portion, forming a welded portion W.

In this embodiment, the trajectory of the laser beam L overlaps both the abutting end of the first metal plate P1 and the abutting end of the second metal plate P2. However, the trajectory of the laser beam L may overlap only with one of the abutted ends of the first metal plate P1 and the second metal plate P2.

Moreover, the control device 4B may make the irradiation energy of the laser beam L in the first area R1 larger than the irradiation energy of the laser beam L in the second area R2 by changing the intensity of the laser beam L depending on the position. .

Furthermore, as shown in FIGS. 7A and 7B, the control device 4B may change the irradiation energy by changing the irradiation position of the laser beam L and changing the focal height of the laser beam L with respect to the irradiation position. .

FIG. 7A is an example of changing the focal height by reciprocating the laser beam L in a direction intersecting the welding direction without changing the focal position of the laser beam L. In this example, the focal point of the laser beam L overlaps with the butt portion of the first metal plate P1 and the second metal plate P2. On the other hand, as the irradiation position moves away from the abutting portion, the focal point height increases, and the energy given to the metal plate decreases.

FIG. 7B is an example in which the focal height is changed by changing the irradiation position while reciprocating the entire laser beam L in the vertical direction without changing the focal position of the laser beam L. In this example, when the irradiation position of the laser beam L is at the abutting portion between the first metal plate P1 and the second metal plate P2, the focal point of the laser beam L is lowest (that is, it overlaps with the abutting portion). On the other hand, as the irradiation position moves away from the abutting portion, the focal height of the laser beam L increases, and the energy given to the metal plate decreases.

[3-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(3a) The irradiation energy of the laser beam L at the abutting portion of the first metal plate P1 and the second metal plate P2 is changed to the irradiation energy of the laser beam L at the area located above the abutting portion of the first metal plate P1 in the vertical direction. By making the irradiation energy larger than the irradiation energy, the first metal plate P1 and the second metal plate P2 can be joined while efficiently supplying molten metal to the gap between the first metal plate P1 and the second metal plate P2.

(3b) Since welding can be performed with a single laser beam, it is possible to weld complex shapes.

[4. Fourth embodiment]
[4-1. composition]
A laser welding device 1C shown in FIG. 8 is a device that performs overlap welding of a first metal plate P1 and a second metal plate P2. The arrangement of the first metal plate P1 and the second metal plate P2 to be processed is the same as in the second embodiment shown in FIG.

The laser welding device 1C includes a laser supply section 2, a processing head 3B, and a control device 4C. The laser supply section 2 of the laser welding device 1C is the same as the laser supply section 2 of the laser welding device 1 of the first embodiment. The processing head 3B of the laser welding device 1C is the same as the processing head 3B of the laser welding device 1B of the third embodiment.

<Control device>
The control device 4C has the same configuration as the control device 4 of the first embodiment except for the details of the laser welding program to be executed.

The control device 4C sets a profile such as the intensity of the laser light supplied by the laser supply unit 2. Further, the control device 4C changes the irradiation position of the laser beam L in a direction intersecting the welding direction D, as shown in FIG. 9A, based on the laser welding program, so that the first The processing head 3B is controlled to weld the first metal plate P1 and the second metal plate P2 while forming the molten pool M1.

Specifically, the control device 4C directs the irradiation energy of the laser beam L in the first region R1 of the overlapping portion of the first metal plate P1 and the second metal plate P2 to the second region around the first region R1. The irradiation energy is made larger than the irradiation energy by the laser beam L in R2. Note that the irradiation energy of the laser beam L in the second region R2 is set to a level that does not cause defects such as underfill.

The control device 4C controls the processing head 3B so that the irradiation position of the laser beam L follows a "figure 8"-shaped trajectory in which two circles are connected in a direction intersecting the welding direction D. These trajectories intersect at the center of the weld (that is, at the center of the weld bead in the width direction). By controlling the laser beam L in this manner, a zigzag welding trajectory intersecting the welding direction D is formed.

The first region R1 is a region including the center of the weld. The two second regions R2 each include a folded back portion of the irradiation position of the laser beam L, and sandwich the first region R1 in a direction orthogonal to the welding direction D.

The control device 4C changes the moving speed of the irradiation position of the laser light L in the two second regions R2 to the irradiation position of the laser light L in the first region R1 while keeping the output (that is, power density) of the laser light L constant. be greater than the movement speed of Thereby, the irradiation energy of the laser beam L in the second region R2 becomes smaller than the irradiation energy of the laser beam L in the first region R1.

As shown in FIG. 9B, the molten metal in the two first molten pools M1 formed in the second region R2 by the laser beam L is supplied to the first region R1 along the flow direction F, and the molten metal in the second molten pool M2 is supplied to the first region R1 along the flow direction F. A welded portion W is formed which penetrates the first metal plate P1 together with the molten metal inside and reaches the second metal plate P2.

The control device 4C may make the irradiation energy of the laser beam L in the first area R1 larger than the irradiation energy of the laser beam L in the second area R2 by changing the intensity of the laser beam L depending on the position.

Furthermore, as shown in FIGS. 10A and 10B, the control device 4C may change the irradiation energy by changing the irradiation position of the laser beam L and changing the focal height of the laser beam L with respect to the irradiation position. .

FIG. 10A is an example in which the focal height is changed by reciprocating the laser beam L in a direction intersecting the welding direction without changing the focal position of the laser beam L. In this example, the focus of the laser beam L overlaps with the first region R1. On the other hand, as the irradiation position moves away from the first region R1, the focal point height increases, and the energy given to the metal plate decreases.

FIG. 10B is an example in which the focal height is changed by changing the irradiation position while reciprocating the entire laser beam L in the vertical direction without changing the focal position of the laser beam L. In this example, when the irradiation position of the laser beam L is in the first region R1, the focal point of the laser beam L is lowest (that is, it overlaps with the first metal plate P1). On the other hand, as the irradiation position moves away from the first region R1, the focal height of the laser beam L increases, and the energy given to the metal plate decreases.

[4-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(4a) The irradiation energy of the laser beam in the first region R1 of the overlapping portion of the first metal plate P1 and the second metal plate P2 is calculated from the irradiation energy of the laser beam in the second region R2 around the first region R1. By making also large, the first metal plate P1 and the second metal plate P2 can be joined while efficiently supplying molten metal to the gap between the first metal plate P1 and the second metal plate P2.

(4b) Since the welding width by the laser beam can be increased, welding is possible even if the gap between the first metal plate P1 and the second metal plate P2 is large.

[5. Fifth embodiment]
(First laser welding program)
The computer constituting the control device 4 of the first embodiment or the control device 4A of the second embodiment functions as the control device 4, 4A by a first laser welding program recorded on a storage medium readable by the computer. Execute.

The first laser welding program causes the computer to form a first molten pool M1 on the first metal plate P1 with the first laser beam L1, and to form the first metal plate P1 and the second metal plate P2 with the second laser beam L2. The machining head 3 is controlled to weld.

(Second laser welding program)
The computer constituting the control device 4B of the third embodiment or the control device 4C of the fourth embodiment functions as the control devices 4B and 4C by a second laser welding program recorded on a storage medium readable by this computer. Execute.

The second laser welding program causes the computer to change the irradiation position of the laser beam L in a direction intersecting the welding direction, thereby forming the first molten pool M1 on at least the first metal plate P1, and The processing head 3B is controlled to weld P1 and the second metal plate P2.

[6. Sixth embodiment]
(First laser welding method)
The first laser welding method using the processing head 3 that irradiates the first laser beam L1 and the second laser beam L2 is carried out by the laser welding device 1 of the first embodiment or the laser welding device 1A of the second embodiment. Ru.

The first laser welding method involves forming a first molten pool M1 on the first metal plate P1 using the first laser beam L1, and welding the first metal plate P1 and the second metal plate P2 using the second laser beam L2. Equipped with a process.

(Second laser welding method)
A second laser welding method using a processing head 3B that irradiates laser light L is performed by the laser welding device 1B of the third embodiment or the laser welding device 1C of the fourth embodiment.

In the second laser welding method, by changing the irradiation position of the laser beam L in a direction intersecting the welding direction, a first molten pool M1 is formed on at least the first metal plate P1, and a first molten pool M1 is formed on the first metal plate P1 and The method includes a step of welding two metal plates P2 together.

[7. Other embodiments]
Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above embodiments and can take various forms.

(7a) In the laser welding apparatus of the above embodiment, as shown in FIG. (Formation of M2) may be performed simultaneously.

(7b) The function of one component in the above embodiment may be distributed as multiple components, or the functions of multiple components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added to, replaced with, etc. in the configuration of other embodiments. Note that all aspects included in the technical idea specified from the words in the claims are embodiments of the present disclosure.

1, 1A, 1B, 1C... Laser welding device, 2... Laser supply section, 3, 3B... Processing head,
4, 4A, 4B, 4C...control device, G...gap, L...laser light, L1...first laser light,
L2...second laser beam, M1...first molten pool, M2...second molten pool, P1...first metal plate,
P2...Second metal plate, R1...First region, R2...Second region, W...Welded part.

Claims (10)

A laser welding device for welding a first metal plate and a second metal plate,
a processing head that irradiates the first metal plate and the second metal plate with a first laser beam and a second laser beam;
A control device that controls the processing head so that the first laser beam forms a molten pool on the first metal plate, and the second laser beam welds the first metal plate and the second metal plate. and,
A laser welding device equipped with. The laser welding device according to claim 1,
The control device causes the second laser beam to irradiate a butt portion of the first metal plate and the second metal plate, and is located above the butt portion of the first metal plate in the vertical direction. A laser welding device that irradiates a region with the first laser beam. The laser welding device according to claim 1,
The control device causes the first laser beam to irradiate a portion of the first metal plate that overlaps with the second metal plate, and controls the irradiation area of the first laser beam and the welding direction of the first metal plate. A laser welding device that irradiates the second laser beam onto a region lined up along the line. A laser welding program used for laser welding a first metal plate and a second metal plate by a processing head that irradiates a first laser beam and a second laser beam,
controlling the processing head to weld the first metal plate and the second metal plate with the second laser beam while forming a molten pool on the first metal plate with the first laser beam; A laser welding program that is executed by a computer. A method of laser welding a first metal plate and a second metal plate using a processing head that irradiates a first laser beam and a second laser beam, the method comprising:
A laser welding method comprising the step of welding the first metal plate and the second metal plate using the second laser beam while forming a molten pool on the first metal plate using the first laser beam. A laser welding device for welding a first metal plate and a second metal plate,
a processing head that irradiates the first metal plate and the second metal plate with laser light;
Welding the first metal plate and the second metal plate while forming a molten pool in at least the first metal plate by changing the irradiation position of the laser beam in a direction crossing the welding direction. a control device that controls the processing head;
A laser welding device equipped with. The laser welding device according to claim 6,
The control device controls the irradiation energy of the laser beam at the butt portion of the first metal plate and the second metal plate to be applied to a region of the first metal plate located above the butt portion in the vertical direction. A laser welding device in which the irradiation energy is greater than the irradiation energy of the laser beam. The laser welding device according to claim 6,
The control device controls the irradiation energy of the laser beam in a first region of the overlapped portion of the first metal plate and the second metal plate to the irradiation energy of the laser beam in a second region around the first region. Laser welding equipment that uses more energy. A laser welding program used for laser welding a first metal plate and a second metal plate using a processing head that irradiates laser light,
Welding the first metal plate and the second metal plate while forming a molten pool in at least the first metal plate by changing the irradiation position of the laser beam in a direction crossing the welding direction. A laser welding program that causes a computer to control the processing head. A method of laser welding a first metal plate and a second metal plate using a processing head that irradiates laser light,
Welding the first metal plate and the second metal plate while forming a molten pool in at least the first metal plate by changing the irradiation position of the laser beam in a direction crossing the welding direction. Equipped with a laser welding method.