JP2021087984A - Welding method and structure - Google Patents

Abstract

To inhibit increase of work hours needed for laser-welding in a case that one member is joined to the other member, having a first surface and a second surface that intersect with each other, by laser-welding.SOLUTION: In a welding method, a body part having a first surface and a second surface which intersects with the first surface is laser-welded to a cover part which overlaps with the first surface and the second surface of the body part. In the welding method, a first portion where the first surface of the body part and the cover part overlap and a second portion where the second surface of the body part and the cover part overlap are laser-welded without changing a laser beam radiation angle relative to the body part.SELECTED DRAWING: Figure 6

Description

The present invention relates to welding methods and structures.

In recent years, in a cooling device composed of members molded using an aluminum material such as aluminum or an aluminum alloy, soldering or brazing is performed in order to join the members molded using the aluminum material. Has been proposed.
For example, in the liquid-cooled cooling device described in Patent Document 1, an aluminum inlet header is brazed to one end surface of an inflow portion of a coolant flow body, and an aluminum outlet header is also brazed to one end surface of an outflow portion. However, it is configured by brazing an aluminum intermediate header to the other end surface of the coolant flower.
Further, as a method for joining members formed by using an aluminum material, Patent No. 2 proposes laser welding.

Japanese Unexamined Patent Publication No. 2016-161158 Japanese Unexamined Patent Publication No. 4-270888

In manufacturing a cooling device that cools an object to be cooled by using a liquid such as a coolant, it is conceivable to superimpose members molded using an aluminum material and join them by laser welding. For example, one member formed using an aluminum material and having a first surface and a second surface intersecting each other is superposed with another member formed using an aluminum material and joined by laser welding. May be done. Specifically, laser welding is performed on a first portion where the first surface of one member and the other member overlap, and a second portion where the second surface of the one member and the other member overlap. As a result, one member may be joined to another member. In this case, if laser welding is performed by changing the irradiation angle of the laser beam between the first part and the second part, the first part is laser-welded and the second part is laser-welded. In each case, it is necessary to perform work such as positioning one member and another member with respect to the laser head, which increases the number of work steps required for laser welding.
An object of the present invention is to suppress an increase in work man-hours required for laser welding when another member is joined to one member having a first surface and a second surface intersecting each other by laser welding. And.

For this purpose, the welding method to which the present invention is applied includes a main body having a first surface and a second surface intersecting the first surface, the first surface of the main body, and the first surface of the main body. A welding method in which a cover portion overlapping the second surface is laser welded, the first portion where the first surface of the main body portion and the cover portion overlap, and the second portion of the main body portion. This is a welding method in which a second portion where a surface and the cover portion overlap is laser welded without changing the irradiation angle of the laser beam to the main body portion.
Here, it is possible to continuously irradiate the first portion and the second portion with a laser beam to perform laser welding.
Further, the incident angle of the laser beam with respect to the first portion is inclined with respect to the perpendicular line of the first surface, and / or the incident angle of the laser beam with respect to the second portion is the second surface. It can be characterized by laser welding so as to be inclined with respect to the perpendicular line of.
From another point of view, the welding method to which the present invention is applied includes a main body portion having a first surface and a second surface intersecting the first surface, and the first body portion of the main body portion. A welding method in which a surface of the body and a cover portion overlapping the second surface are laser-welded, the first portion of the main body portion where the first surface and the cover portion overlap, and the main body portion. This is a welding method of irradiating a second portion where the second surface and the cover portion overlap with a laser beam while continuously moving the laser head.
From another point of view, the structure to which the present invention is applied includes a main body having a first surface and a second surface intersecting the first surface, and the first of the main body. A first welded portion that joins a cover portion that overlaps the surface and the second surface, a first welded portion that joins the first portion of the main body portion that overlaps the first surface and the cover portion, and the first welded portion of the main body portion. It has a second welded portion that joins a second portion where the two surfaces and the cover portion overlap, and the first welded portion is in the depth direction from the cover portion side toward the main body portion side. The structure is characterized in that the first direction in which it extends and the second direction in which the second welded portion extends in the depth direction from the cover portion side toward the main body portion side are equal to each other.

According to the present invention, when joining another member to one member having a first surface and a second surface intersecting each other by laser welding, it is possible to suppress an increase in work man-hours required for laser welding. Can be done.

It is a perspective view of the liquid-cooled cooling system to which this embodiment is applied. It is a disassembled figure of the component which comprises the liquid-cooled cooling system. It is a figure which looked at the apparatus main body of the liquid cooling type cooling apparatus from the direction III in FIG. It is sectional drawing of the IV-IV part in FIG. It is a figure which showed an example of the manufacturing method of the conventional liquid cooling type cooling apparatus, and is the figure which showed the state which irradiates the laser light to the 1st part and the 2nd part. It is a figure which showed an example of the manufacturing method of the liquid-cooled cooling apparatus of this embodiment, and is the figure which showed the state which irradiates the laser light to the 1st part and the 2nd part. It is a figure which showed an example of the manufacturing method of the liquid-cooled cooling apparatus of this embodiment, and is the figure which showed the state which irradiates the laser light to the 1st part and the 2nd part. (A) to (b) are views showing an example of the cross-sectional shape of the welded portion formed in the portion where the apparatus main body and the cover portion overlap. (A)-(b) is a figure which showed the liquid-cooled cooling system to which another form of this invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of a liquid-cooled cooling device 1 to which the present embodiment is applied. FIG. 2 is an exploded view of the parts constituting the liquid-cooled cooling device 1. FIG. 3 is a view of the apparatus main body 10 of the liquid-cooled cooling device 1, which will be described later, as viewed from the direction III in FIG. FIG. 4 is a cross-sectional view of the IV-IV portion in FIG. Here, the liquid-cooled cooling device 1 of the present embodiment has a long shape, and FIGS. 1 to 4 show one end of the liquid-cooled cooling device 1 in the longitudinal direction. There is.

The liquid-cooled cooling device 1 of the present embodiment includes an apparatus main body 10 through which a coolant flows, and a cover portion 20 that covers an end portion of the apparatus main body 10. Although not shown, the liquid-cooled cooling device 1 has an inlet joint that allows the cooling liquid to flow from the outside to the inside of the device main body 10 and an outlet joint that allows the cooling liquid to flow out from the inside of the device main body 10 to the outside. , It is provided at the other end in the longitudinal direction, which does not appear in FIGS. 1 to 4. Although the details will be described later, in the liquid-cooled cooling device 1, the device main body 10 and the cover portion 20 are integrated by being joined by laser welding.

(Device body 10)
The apparatus main body 10 is a member having a rectangular parallelepiped shape. The apparatus main body 10 is formed by using an extruded material of JIS A6063 alloy formed by extrusion processing, and is formed so that the extrusion direction is the longitudinal direction. Further, as shown in FIG. 1, the length of the apparatus main body 10 in the longitudinal direction and the lateral direction is larger than the length in the vertical direction. It can be exemplified that the quality of the JIS A6063 alloy is T1, T5, and T6. Further, although other types may be used, it is desirable that the hardness of the apparatus main body 10 is 42 (HV (Vickers hardness)) or more.

A plurality of through holes 11 penetrating from one end to the other in the longitudinal direction are formed inside the main body 10. In addition, as shown in FIG. 2, one end of each through hole 11 in the longitudinal direction is exposed on the side wall portion 14 of the apparatus main body 10. Then, in the liquid-cooled cooling device 1, the end portion of the through hole 11 exposed to the side wall portion 14 of the device main body 10 is closed by the side surface portion 22 described later of the cover portion 20.

In the liquid-cooled cooling device 1 according to the present embodiment, as shown in FIG. 2, two through holes 11 are provided on the front side of the central portion in the lateral direction and on the back side of the central portion. A total of four are formed. Further, the adjacent through holes 11 are partitioned by an inner wall 11a extending along the longitudinal direction.
The two through holes 11 on the front side of the four through holes 11 function as inflow side flow paths 111 in which the coolant flowing in through the inlet joint flows from the other end to one end. Further, the two through holes 11 on the inner side of the four through holes 11 function as outflow side flow paths 112 in which the coolant flows from one end to the other toward the outlet joint.

Further, the apparatus main body 10 is formed with a recess 12 recessed from the upper wall portion 13 at one end in the longitudinal direction. The recess 12 is formed so as to communicate with the inflow side flow path 111 and the outflow side flow path 112.
The recess 12 is formed by removing the upper wall portion 13 and the inner wall 11a of the apparatus main body 10 by, for example, cutting. In the example shown in FIG. 2, the inner wall 11a is completely removed from the upper side to the lower side, but a part of the upper side may be removed and a lower part may remain.
In the liquid-cooled cooling device 1 of the present embodiment, the upper side of the recess 12 is closed by the upper surface portion 21 of the cover portion 20, which will be described later, so that the cooling liquid travels in the inside of the cover portion 20 and the recess 12. A space 120 for changing is formed.
Here, in the liquid-cooled cooling device 1 of the present embodiment, the upper wall portion 13 of the apparatus main body 10 corresponds to the first surface, and the side wall portion 14 corresponds to the second surface that intersects the first surface. To do. Further, in this example, the upper wall portion 13 and the side wall portion 14 of the apparatus main body 10 are vertical.

(Cover 20)
The cover portion 20 has an approximate shape in which a plate-shaped member is bent at a right angle, and is arranged at one end of the apparatus main body 10. The cover portion 20 extends vertically from one end of the upper surface portion 21 and the upper surface portion 21 which is overlapped with the upper wall portion 13 of the apparatus main body 10, and the side surface portion 22 which extends in the vertical direction and is overlapped with the side wall portion 14 of the apparatus main body 10. And have. As described above, the upper surface portion 21 of the cover portion 20 is overlapped with the upper wall portion 13 of the device main body 10, so that the upper side of the recess 12 formed in the device main body 10 is closed. Further, the side surface portion 22 of the cover portion 20 is overlapped with the side wall portion 14 of the device main body 10, so that one end of the through hole 11 formed in the device main body 10 in the longitudinal direction is closed.
The cover portion 20 is formed by using a plate material of JIS A3003 alloy. It should be noted that the classification of the JIS A3003 alloy can be exemplified as the quality H12 or the quality H18. Further, although other types may be used, it is desirable that the hardness of the cover portion 20 is 35 (HV) or more.

(Action of liquid-cooled cooling device 1)
In the liquid-cooled cooling device 1 configured as described above, the liquid-cooled cooling device 1 cools the upper wall portion 13 of the apparatus main body 10 on the other end side in the longitudinal direction from the cover portion 20. The object to be cooled is placed. The object to be cooled is not particularly limited, and examples thereof include an assembled battery composed of a plurality of rectangular parallelepiped single batteries.
Then, as shown in FIG. 3, in the liquid-cooled cooling device 1, the cooling liquid that has flowed into the inside of the device main body 10 from the inlet joint (not shown) passes through the inflow side flow path 111 and reaches the recess 12. The coolant that has reached the recess 12 changes its traveling direction in the recess 12, and then flows out of the apparatus main body 10 from an outlet joint (not shown) through the outflow side flow path 112. In this way, the liquid-cooled cooling device 1 is placed on the upper wall portion 13 of the device main body 10 while the cooling liquid flows through the inflow side flow path 111 and the outflow side flow path 112 of the device main body 10. Cool the object to be cooled.

(Manufacturing method of liquid-cooled cooling device 1)
The liquid-cooled cooling device 1 configured as described above is manufactured as follows.
With the cover portion 20 superimposed on one end of the apparatus main body 10, the laser beam is continuously applied to the portion where the apparatus main body 10 and the cover portion 20 overlap. More specifically, the first portion S1 (see FIG. 6 and the like described later) where the upper wall portion 13 of the device main body 10 and the upper surface portion 21 of the cover portion 20 overlap, and the side wall portion 14 and the cover portion of the device main body 10 The laser beam is continuously irradiated to each of the second portion S2 (see FIG. 6 and the like described later) that overlaps with the side surface portion 22 of the 20. In this example, the laser beam is continuously irradiated along the peripheral edge of the cover portion 20 at the first portion S1 and the second portion S2. As a result, the cover portion 20 is joined to one end of the apparatus main body 10.
Further, the laser beam is irradiated to the first portion S1 where the upper wall portion 13 of the apparatus main body 10 and the upper surface portion 21 of the cover portion 20 overlap, so that the first welded portion 31 is located at the position where the laser beam is irradiated. (See FIGS. 1 and 4) are formed. Similarly, the laser beam is irradiated to the second portion S2 where the side wall portion 14 of the apparatus main body 10 and the side surface portion 22 of the cover portion 20 overlap, so that the second welded portion 32 is located at the position where the laser beam is irradiated. (See FIG. 1) is formed. In the following description, when the first welded portion 31 and the second welded portion 32 are not distinguished from each other, they may be collectively referred to as the welded portion 30.

(About conventional problems)
By the way, when the cover portion 20 is laser-welded to the apparatus main body 10 by irradiating the first portion S1 and the second portion S2 with a laser beam, the device is formed by the first portion S1 and the second portion S2. It is conceivable to irradiate the laser beam by changing the irradiation angle with respect to the main body 10 and the cover portion 20. For example, the apparatus main body 10 and the second portion S2 are equal to each other so that the angle of incidence of the laser beam on the first portion S1 and the angle of incidence of the laser beam on the second portion S2 are equal. The laser beam may be irradiated by changing the irradiation angle with respect to the cover portion 20.
FIG. 5 is a diagram showing an example of a method of manufacturing the conventional liquid-cooled cooling device 1, showing a state in which the first portion S1 and the second portion S2 are irradiated with the laser beam L. It is a figure. FIG. 5 corresponds to a view of the liquid-cooled cooling device 1 viewed from the front side of the device main body 10 in the lateral direction.

In the conventional example shown in FIG. 5, the laser beam L for the apparatus main body 10 and the cover portion 20 is used depending on whether the first portion S1 is irradiated with the laser beam L or the second portion S2 is irradiated with the laser beam L. The irradiation angle of is changed. In addition, in the conventional example shown in FIG. 5, the laser head is such that the incident angle of the laser beam L with respect to the first portion S1 and the incident angle of the laser beam L with respect to the second portion S2 are both 90 degrees. The laser beam L is irradiated by LH.

As shown in FIG. 5, when the irradiation angle of the laser beam L with respect to the apparatus main body 10 and the cover portion 20 is changed between the first portion S1 and the second portion S2, the first portion S1 and the second portion S2 It is difficult to continuously irradiate the laser beam L. That is, first, the apparatus main body 10 and the cover portion 20 are positioned with respect to the laser head LH so that the first portion S1 faces the laser head LH, and the first portion S1 is irradiated with the laser beam. Subsequently, the apparatus main body 10 and the cover portion 20 are positioned again with respect to the laser head LH so that the second portion S2 faces the laser head LH, and the second portion S2 is irradiated with the laser beam L. .. As described above, the positioning of the apparatus main body 10 and the cover portion 20 with respect to the laser head LH in each of the case of irradiating the first portion S1 with the laser beam L and the case of irradiating the second portion S2 with the laser beam L. Work needs to be done. In this case, the work man-hours required for laser welding increase.
Further, for example, after irradiating the first portion S1 with the laser beam L, the apparatus main body 10 and the cover portion 20 are positioned again with respect to the laser head LH, and the second portion S2 is irradiated with the laser beam L. There may be a discrepancy between the irradiation position of the laser beam L with respect to the first portion S1 and the irradiation position of the laser beam L with respect to the second portion S2. In this case, for example, a region where the welded portion 30 is not formed between the first welded portion 31 formed in the first portion S1 and the second welded portion 32 formed in the second portion S2. May cause leakage of the coolant in the liquid-cooled cooling device 1.

(About laser welding process)
On the other hand, in the manufacturing method (welding method) of the liquid-cooled cooling device 1 of the present embodiment, the irradiation angle with respect to the device main body 10 and the cover portion 20 is set at the first portion S1 and the second portion S2. Laser welding is performed by irradiating the laser beam L without changing it. Hereinafter, the laser welding process in the manufacturing method of the liquid-cooled cooling device 1 of the present embodiment will be described in more detail.
6 and 7 are views showing an example of the manufacturing method of the liquid-cooled cooling device 1 of the present embodiment, in which the first portion S1 and the second portion S2 are irradiated with the laser beam L. It is a figure which showed the state which is. FIG. 6 corresponds to a perspective view of the liquid-cooled cooling device 1, and FIG. 7 corresponds to a view of the liquid-cooled cooling device 1 viewed from the front side of the device main body 10 in the lateral direction.

As shown in FIGS. 6 and 7, in the present embodiment, the laser beam L is irradiated from a direction intersecting both the first portion S1 and the second portion S2. As a result, the orientation of the laser head LH with respect to the apparatus main body 10 and the cover portion 20 is changed depending on whether the first portion S1 is irradiated with the laser beam L or the second portion S2 is irradiated with the laser beam L. Is no longer necessary. Then, the laser beam L can be continuously irradiated to the first portion S1 and the second portion S2.

In the present embodiment, for example, the laser welding step is performed by the following procedure.
First, the apparatus main body 10 and the cover portion 20 are positioned with respect to the laser head LH. Specifically, as shown in FIG. 6, the focal point of the laser beam L irradiated by the laser head LH is the predetermined start point position 41 in the first portion S1 (in this example, the longitudinal direction in the first portion S1). The apparatus main body 10 and the cover portion 20 are positioned with respect to the laser head LH so as to be on one end side in the direction and the back corner in the lateral direction). In addition, in the present embodiment, the irradiation direction of the laser beam L to the first portion S1 is inclined with respect to the perpendicular line of the upper wall portion 13 or the upper surface portion 21, and the perpendicular line of the side wall portion 14 or the side surface portion 22. The apparatus main body 10 and the cover portion 20 are positioned with respect to the laser head LH so as to be inclined with respect to the laser head LH. In this example, the irradiation direction of the laser beam L is set to be inclined in the longitudinal direction with respect to the vertical direction of the liquid-cooled cooling device 1.

Next, as shown in FIG. 6, the laser beam L is continuously irradiated to the first portion S1 while moving the laser head LH along the peripheral edge of the upper surface portion 21 of the cover portion 20. In addition, the laser beam L is continuously irradiated to the first portion S1 while the laser head LH is translated so that the distance between the upper surface portion 21 and the laser head LH in the cover portion 20 does not fluctuate. The irradiation position of the laser beam L in the first portion S1 is a peripheral edge of the upper surface portion 21 of the cover portion 20 and a position outside the recess 12 formed in the apparatus main body 10.

Next, when the laser beam L is irradiated to the boundary position 42 between the first portion S1 and the second portion S2, the apparatus main body 10 and the cover portion do not change the direction of the laser head LH with respect to the apparatus main body 10 and the cover portion 20. The laser head LH is moved downward with respect to 20 so as to face the second portion S2. Then, following the first portion S1, the second portion S2 is irradiated with the laser beam L. Specifically, similarly to the first portion S1, the laser beam L is continuously irradiated to the second portion S2 while moving the laser head LH along the peripheral edge of the side surface portion 22 of the cover portion 20. .. In addition, the laser beam L is continuously irradiated to the second portion S2 while the laser head LH is translated so that the distance between the side surface portion 22 and the laser head LH in the cover portion 20 does not fluctuate. The irradiation position of the laser beam L in the second portion S2 is the peripheral edge of the side surface portion 22 of the cover portion 20, and is from one end of the through hole 11 formed in the apparatus main body 10 and exposed to the side wall portion 14. Is also the outer position.

Next, when the laser beam L is irradiated to the boundary position 43 between the first portion S1 and the second portion S2, the laser head LH is set to the starting point position without changing the direction of the laser head LH with respect to the apparatus main body 10 and the cover portion 20. It is moved upward to a position facing the 41, and the irradiation of the laser beam L is completed.
As a result, the peripheral edge of the cover portion 20 is laser-welded at both the first portion S1 and the second portion S2 to form the first welded portion 31 and the second welded portion 32. As described above, in the present embodiment, the directions of the laser head LH with respect to the apparatus main body 10 and the cover portion 20 are the same in the first portion S1 and the second portion S2. As a result, the first welded portion 31 extends in the depth direction from the cover portion 20 side toward the device main body 10 side, and the second welded portion 32 moves from the cover portion 20 side to the device main body 10 side. The second direction extending in the depth direction is equal to each other.
Here, a case where the laser beam L is irradiated while moving the laser head LH to the device main body 10 and the cover portion 20 has been illustrated. For example, the device main body 10 and the cover are applied to the fixed laser head LH. The laser beam L may be irradiated while moving the apparatus main body 10 and the cover portion 20 without changing the direction of the laser head LH with respect to the portion 20.

Here, in the present embodiment, the irradiation direction of the laser beam L with respect to the first portion S1 is inclined with respect to the perpendicular line of the upper wall portion 13 or the upper surface portion 21, and the laser beam L with respect to the second portion S2 The irradiation direction of the laser beam L is set so that the irradiation direction is inclined with respect to the perpendicular line of the side wall portion 14 or the side surface portion 22. In other words, the irradiation direction of the laser beam L is set so that the incident angle θ1 of the laser beam L with respect to the first portion S1 and the incident angle θ2 of the laser beam L with respect to the second portion S2 are less than 90 °. ing.

8 (a) to 8 (b) are views showing an example of the cross-sectional shape of the welded portion 30 formed at the portion where the apparatus main body 10 and the cover portion 20 overlap. FIG. 8A shows the cross-sectional shape of the welded portion 30 formed when the laser beam L is irradiated so that the incident angles θ1 and θ2 of the laser beam L are less than 90 °. ) Indicates the cross-sectional shape of the welded portion 30 formed when the laser beam L is irradiated so that the incident angles θ1 and θ2 of the laser beam L are 90 °. The welded portion 30 of FIG. 8A and the welded portion 30 of FIG. 8B are formed by irradiating the laser beam L of the same intensity.
When the laser beam L is applied to the portion where the apparatus main body 10 and the cover portion 20 overlap, the energy of the laser beam L is converted into heat, so that the materials constituting the apparatus main body 10 and the cover portion 20 are melted. After that, it is cooled rapidly. As a result, the welded portion 30 is formed at the position where the laser beam L is irradiated.

As shown in FIGS. 8A to 8B, by setting the incident angles θ1 and θ2 of the laser beam L to less than 90 °, it is compared with the case where the incident angles θ1 and θ2 of the laser beam L are set to 90 °. Therefore, the width W of the welded portion 30 can be increased. As a result, the bonding strength between the apparatus main body 10 and the cover portion 20 can be improved without increasing the intensity of the laser beam L.
The width W of the welded portion 30 is preferably 45% or more of the plate thickness of the aluminum material constituting the cover portion 20, for example.
Further, as shown in FIGS. 8A to 8B, when the incident angles θ1 and θ2 of the laser beam L are set to less than 90 °, the incident angles θ1 and θ2 of the laser beam L are set to 90 °. In comparison, the depth D of the welded portion 30 can be reduced. As a result, it is possible to prevent the welded portion 30 from penetrating the apparatus main body 10.

The incident angle θ1 of the laser beam L with respect to the first portion S1 and the incident angle θ2 of the laser beam L with respect to the second portion S2 also differ depending on the angle formed by the upper wall portion 13 and the side wall portion 14 of the apparatus main body 10. However, for example, it can be in the range of 30 ° or more and less than 90 °.
If sufficient bonding strength between the device main body 10 and the cover portion 20 can be obtained and a welded portion 30 that does not penetrate the device main body 10 can be formed, the laser beam L with respect to the first portion S1. The laser beam L may be irradiated so that one of the incident angles θ2 of the laser beam L with respect to the incident angle θ1 or the second portion S2 is 90 °.

The laser source of the laser beam L used in the laser welding step of the present embodiment is not particularly limited. It can be exemplified that it is a YAG laser, a CO ₂ laser, a fiber laser, a disk laser, and a semiconductor laser. Further, the intensity of the laser beam L, the spot diameter, the moving speed of the laser head LH, and the like can be set according to the shape and material of the apparatus main body 10 and the cover portion 20, the type of the laser source, and the like.

As described above, in the method for manufacturing the liquid-cooled cooling device 1 of the present embodiment, the irradiation angle of the laser beam L with respect to the device main body 10 and the cover portion 20 at the first portion S1 and the second portion S2. Laser welding is performed without changing. In other words, in the method for manufacturing the liquid-cooled cooling device 1 of the present embodiment, the first portion S1 and the second portion S2 are irradiated with the laser beam L while continuously moving the laser head LH. , Laser welding is performed. As a result, for example, when laser welding is performed on the first portion S1 and when laser welding is performed on the second portion S2, the apparatus main body 10 and the cover portion 20 are positioned with respect to the laser head LH. This becomes unnecessary, and an increase in the number of work steps required for laser welding can be suppressed.

Further, in the liquid-cooled cooling device 1 of the present embodiment, both the recess 12 formed in the device main body 10 and the end portion of the through hole 11 are closed by a cover portion 20 which is a single member. As a result, when the cover portion 20 is joined to the apparatus main body 10 by laser welding, it is possible to irradiate the laser beam L while continuously moving the laser head LH. Further, the number of parts used for the liquid-cooled cooling device 1 can be reduced as compared with the case where the recess 12 of the device main body 10 and the end of the through hole 11 are closed by different members. Furthermore, compared to the case where the recess 12 of the apparatus main body 10 and the end of the through hole 11 are closed by different members, laser welding is performed to close the recess 12 of the device main body 10 and the end of the through hole 11. The distance to be performed (the length of the welded portion 30) can be shortened.

(About other forms of liquid-cooled cooling device 1)
Subsequently, another embodiment of the liquid-cooled cooling device 1 to which the welding method of the present embodiment can be applied will be described. In the examples shown in FIGS. 1 to 8, the upper wall portion 13 which is an example of the first surface of the apparatus main body 10 and the side wall portion 14 which is an example of the second surface are vertical, and the cover The upper surface portion 21 and the side surface portion 22 of the portion 20 are vertical, but the shapes of the apparatus main body 10 and the cover portion 20 are not limited to this.
9 (a) to 9 (b) are views showing the liquid-cooled cooling device 1 to which another embodiment of the present invention is applied.

As shown in FIG. 9A, the upper wall portion 13 and the side wall portion 14 of the apparatus main body 10 are not vertical, and similarly, the upper surface portion 21 and the side surface portion 22 of the cover portion 20 may not be vertical. In the example shown in FIG. 9A, the side wall portion 14 is in the direction perpendicular to the upper wall portion 13 so that the height of the device main body 10 decreases toward one end side in the longitudinal direction of the device main body 10. It is inclined with respect to. Further, the side surface portion 22 of the cover portion 20 is inclined with respect to the direction perpendicular to the upper surface portion 21 so as to overlap the side wall portion 14 of the apparatus main body 10.
Then, when the cover portion 20 is welded to the apparatus main body 10 shown in FIG. 9A by laser welding, the cover portion 20 is welded to both the first portion S1 and the second portion S2 as in the above-mentioned example. The laser beam L is irradiated from the intersecting directions. As a result, the orientation of the laser head LH with respect to the apparatus main body 10 and the cover portion 20 is changed depending on whether the first portion S1 is irradiated with the laser beam L or the second portion S2 is irradiated with the laser beam L. Is no longer necessary.

Further, as shown in FIG. 9B, the liquid-cooled cooling device 1 has a third portion S3 in addition to the first portion S1 and the second portion S2 as a target portion for laser welding. You may be. In the liquid-cooled cooling device 1 shown in FIG. 9B, the device main body 10 has an extension portion 15 extending in the longitudinal direction from the end portion of the side wall portion 14 in addition to the upper wall portion 13 and the side wall portion 14. doing. Further, the cover portion 20 has, in addition to the upper surface portion 21 and the side surface portion 22, a flat surface portion 23 extending from the end portion of the side surface portion 22 along the longitudinal direction and overlapping the extending / extending portion 15. In the example shown in FIG. 9B, the upper wall portion 13 and the extending portion 15 of the apparatus main body 10 are parallel to each other, and the upper surface portion 21 and the flat surface portion 23 of the cover portion 20 are parallel to each other.
Then, when the cover portion 20 is welded to the apparatus main body 10 shown in FIG. 9B by laser welding, in addition to the first portion S1 and the second portion S2, the extension portion 15 of the apparatus main body 10 is formed. The laser beam L is irradiated from the direction intersecting the third portion S3 where the flat surface portion 23 of the cover portion 20 overlaps, and the first portion S1, the second portion S2, and the third portion S3 are continuously irradiated. Laser welding is performed. As a result, there are cases where the first portion S1 is irradiated with the laser beam L, the second portion S2 is irradiated with the laser beam L, and the third portion S3 is irradiated with the laser beam L. It is not necessary to change the direction of the laser head LH with respect to the main body 10 and the cover portion 20.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments of the present invention. Various modifications and combinations may be made as long as it does not contradict the gist of the present invention.
For example, in the above-described embodiment, the irradiation direction of the laser beam L is inclined in the longitudinal direction with respect to the vertical direction of the liquid-cooled cooling device 1, so that the laser is directed to the first portion S1 and the second portion S2. The light L was irradiated, but the present invention is not limited to this. The laser beam L may be irradiated to the first portion S1 and the second portion S2 so that the irradiation direction of the laser beam L is inclined in the lateral direction with respect to the vertical direction of the liquid-cooled cooling device 1. Then, the irradiation direction of the laser beam L is inclined in both the lateral direction and the longitudinal direction with respect to the vertical direction of the liquid-cooled cooling device 1, so that the laser beam is directed to the first portion S1 and the second portion S2. You may irradiate L.

1 ... Liquid-cooled cooling device, 10 ... Device body, 11 ... Through hole, 12 ... Recession, 13 ... Upper wall part, 14 ... Side wall part, 20 ... Cover part, 21 ... Top surface part, 22 ... Side part, 30 ... Welded part, 31 ... 1st welded part, 32 ... 2nd welded part, L ... laser beam, LH ... laser head, S1 ... 1st part, S2 ... 2nd part, S3 ... 3rd part

Claims (5)

A welding method in which a main body portion having a first surface and a second surface intersecting the first surface and a cover portion overlapping the first surface and the second surface of the main body portion are laser welded. And
A laser for the main body portion is provided by a first portion where the first surface of the main body portion and the cover portion overlap and a second portion where the second surface of the main body portion and the cover portion overlap. A welding method in which laser welding is performed without changing the light irradiation angle. The welding method according to claim 1, wherein the first portion and the second portion are continuously irradiated with a laser beam to perform laser welding. The angle of incidence of the laser beam on the first portion is inclined with respect to the perpendicular of the first surface, and / or the angle of incidence of the laser beam on the second portion is the perpendicular of the second surface. The welding method according to claim 1 or 2, wherein the welding is performed by laser so as to be inclined with respect to the above. A welding method in which a main body portion having a first surface and a second surface intersecting the first surface and a cover portion overlapping the first surface and the second surface of the main body portion are laser welded. And
The laser head is continuously provided to the first portion where the first surface of the main body portion and the cover portion overlap and the second portion where the second surface of the main body portion and the cover portion overlap. A welding method that irradiates a laser beam while moving it. A main body having a first surface and a second surface intersecting the first surface,
A cover portion that overlaps the first surface and the second surface of the main body portion,
A first welded portion that joins a first portion where the first surface of the main body portion and the cover portion overlap.
It has a second welded portion that joins a second portion where the second surface of the main body portion and the cover portion overlap.
The first welded portion extends in the depth direction from the cover portion side toward the main body portion side, and the second welded portion is deep from the cover portion side toward the main body portion side. A structure characterized in that the second directions extending in the longitudinal direction are equal to each other.

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