JP2022015870A - Welded component manufacturing method and welding system - Google Patents

Abstract

To provide a welded component manufacturing method which can reliably suppress unintentional deformation of a thin steel sheet due to weld heat during welding such as fillet welding, and a welding system.SOLUTION: A second plate 4 is welded onto a first surface 2a of a first plate 2. In a welding process, a cooling medium 14a is supplied to a second surface 2b of the first plate 2. The cooling medium 14a is injected from a conduit 14 located on the second surface 2b side of the first plate 2. During heating by welding, the injected cooling medium 14a is supplied to an area of the second surface 2b that overlaps a part, where the first surface 2a and the second plate 4 should be welded, in a plain. The welding process is performed in the state that a downward force is applied to the first surface 2a of the first plate 2 by a restraint member 18 which is placed on the first surface 2a of the first plate 2 and can apply the downward force to the first surface 2a.SELECTED DRAWING: Figure 9

Description

The present disclosure relates to a method of manufacturing welded parts and a welding system.

For example, a technique has been conventionally known in which another steel plate is so-called fillet welded on the upper surface of a rectangular thin steel plate so as to intersect with the steel plate to form a welded part. The other steel sheet reinforces the thin steel sheet so that it is not easily deformed. Such techniques are used, for example, in ship manufacturing, ship repair and hull block manufacturing. In addition, such technology is also used, for example, in the steel frame manufacturing industry, the construction metal product manufacturing industry, and the can sheet metal industry.

When fillet welding another steel sheet to a thin steel sheet, it is preferable to reduce unintended deformation of the thin steel sheet due to the welding heat. Therefore, at the time of welding, the welded portion on the upper surface of the thin steel sheet is heated, and the lower surface of the thin steel sheet is cooled by a refrigerant or the like. Such a technique is proposed, for example, in Japanese Patent Application Laid-Open No. 2001-13887 (Patent Document 1). In Japanese Patent Application Laid-Open No. 2001-13887, when another steel plate as a bending-proof material is fillet welded onto a thin steel plate, the refrigerant is ejected while moving the refrigerant ejection nozzle arranged under the thin steel plate. Cooling water is supplied to the lower surface of the sheet steel. This cools the thin steel sheet.

Japanese Unexamined Patent Publication No. 2001-13887

According to the disclosure technique of JP-A-2001-13887, a plurality of flexible materials are sequentially welded on the thin steel sheet. That is, both the heating and cooling of the thin steel sheet are performed while the welding torch used for heating and the refrigerant ejection nozzle move together. In this case, the position of the refrigerant ejection nozzle is adjusted so that the region that is planarly overlapped with the region heated by the welding torch is cooled by the refrigerant immediately after being heated. Therefore, it is desirable that the positions of the welding torch and the refrigerant ejection nozzle in a plan view are substantially synchronized. However, it is difficult to synchronize the positions of both in such a way. If there is a large difference in timing between heating and cooling in a certain region, the effect of suppressing deformation of the thin steel sheet due to cooling may not be obtained.

This disclosure has been made in view of the above issues. An object of the present invention is to provide a method for manufacturing a welded part and a welding system capable of more reliably suppressing unintended deformation of a thin steel sheet due to welding heat during welding such as fillet welding.

In the method for manufacturing a welded part according to the present disclosure, a first plate material and a second plate material are prepared. A second plate is welded onto the first surface of the first plate. In the welding step, the cooling medium is supplied to the second surface opposite to the first surface of the first plate material. The cooling medium is ejected from a water pipe arranged on the second surface side of the first plate material. During the heating by welding, the sprayed cooling medium is supplied to the region of the second surface where the first surface and the second plate are planarly overlapped with each other to be welded. The welding step is performed downward on the first surface of the first plate material by a restraining member placed on the first surface of the first plate material and capable of applying a downward force to the first surface. It is done with the force applied to.

The welding system according to the present disclosure is a welding system for welding a second plate material onto a first surface of the first plate material. The welding system includes a receiving material, a water pipe, and a first gutter member. As the receiving material, the first plate material is installed. The water pipe can supply the cooling medium to the second surface opposite to the first surface to which the second plate of the first plate installed on the receiving material is welded. The first gutter member extends from directly below the water pipe to the periphery of the water pipe, and drains the cooling medium injected from the water pipe. The water pipe extends along the first direction in plan view. A plurality of injection portions for injecting the cooling medium from the water pipe are arranged at intervals along the first direction in the water pipe. Further, a restraining member which is placed on the first surface of the first plate material and can apply a downward force to the first surface is further provided.

According to the present disclosure, it is possible to provide a method for manufacturing a welded part and a welding system capable of more reliably suppressing unintended deformation of a thin steel sheet due to welding heat during welding such as fillet welding.

It is a schematic perspective view which shows the structure of the welding system which concerns on Embodiment 1. FIG. It is a schematic plan view which shows the structure of the welding system which concerns on Embodiment 1. FIG. It is the schematic sectional drawing of the part along the line III-III in FIG. It is a schematic enlarged plan view of the region IV surrounded by the dotted line in FIG. It is a schematic enlarged plan view of the region V surrounded by the dotted line in FIG. It is a schematic enlarged sectional view which shows the operation of the restraint member in the state which the welding object is mounted in the region VI surrounded by the dotted line in FIG. It is a schematic perspective view which shows the manufacturing process of the welded part using the welding system of Embodiment 1. FIG. 2 is a schematic cross-sectional view showing an aspect in the manufacturing process of the portion along the line III-III in FIG. 2. FIG. 5 is a schematic cross-sectional view of a portion along the IX-IX line in FIG. 8 in the manufacturing process of the first embodiment. It is a schematic perspective view which shows the manufacturing process of the welded part using the welding system of Embodiment 2. FIG. FIG. 5 is a schematic cross-sectional view of a portion along the IX-IX line in FIG. 8 in the manufacturing process of the second embodiment. It is a schematic plan view which shows the structure of the welding system which concerns on Embodiment 3. FIG. 12 is a schematic cross-sectional view of a portion along the line XIII-XIII in FIG. It is a schematic enlarged plan view of the region XIV surrounded by the dotted line in FIG. 12. 14 is a schematic cross-sectional view of a portion along the XV-XV line in FIG. It is a schematic enlarged plan view of the region XVI surrounded by the dotted line in FIG. 12. 16 is a schematic cross-sectional view of a portion along the XVII-XVII line in FIG. It is a schematic enlarged plan view of the region XVIII surrounded by the dotted line in FIG. 12. FIG. 8 is a schematic cross-sectional view of a first example of a portion along the XIX-XIX line in FIG. FIG. 8 is a schematic cross-sectional view of a second example of a portion along the XIX-XIX line in FIG. FIG. 5 is a schematic cross-sectional view of a first example of a portion corresponding to FIG. 9 in the fourth embodiment. FIG. 5 is a schematic cross-sectional view of a second example of a portion corresponding to FIG. 9 in the fourth embodiment.

Hereinafter, the present embodiment will be described with reference to the drawings. For convenience of explanation, the X direction, the Y direction, and the Z direction are introduced in each figure.

(Embodiment 1)
First, the configuration of the welding system according to the present embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 is a schematic perspective view showing the configuration of the welding system according to the first embodiment. FIG. 2 is a schematic plan view showing the configuration of the welding system according to the first embodiment. FIG. 3 is a schematic cross-sectional view of a portion along lines III-III in FIG. FIG. 4 is a schematic enlarged plan view of the region IV surrounded by the dotted line in FIG. FIG. 5 is a schematic enlarged plan view of the region V surrounded by the dotted line in FIG. FIG. 6 is a schematic enlarged cross-sectional view showing the operation of the restraining member in a state where the welding object is mounted on the region VI surrounded by the dotted line in FIG. With reference to FIGS. 1 to 6, the welding system 100 of the present embodiment is, for example, the upper side (hereinafter, simply upper side) in the Z direction, which is one of a pair of main surfaces of the first plate material facing each other. It is a facility for welding a second plate material on the first surface of the above. For example, fillet welding is performed in the welding system 100, but the welding system 100 is not limited to this, and other welding methods may be performed. Here, the first plate material is, for example, a thin steel plate having a pair of main surfaces facing each other having a rectangular shape and having a thickness of, for example, 10 mm or less. Further, the second plate material is, for example, a pair of thin steel plates having a rectangular main surface facing each other, similarly to the first plate material. However, the materials and dimensions of the first plate material and the second plate material are not limited to this.

The welding system 100 mainly includes a gantry 10, a receiving material 12, a water pipe 14, a first gutter member 16, a second gutter member 16a, and a restraining member 18. The gantry 10 is a member for supporting each member constituting the welding system 100. As shown in FIG. 2, the gantry 10 extends along the Y direction, for example, and a plurality of pedestals 10 are arranged at intervals in the X direction. As shown in FIG. 3, it is preferable that the cross-sectional view of the gantry 10 intersecting in the extending direction has an H-shape, for example. That is, in the cross-sectional view of FIG. 3, the gantry 10 has a portion extending in the height direction and a pair of horizontally extending portions connected to the uppermost portion and the lowermost portion in the height direction.

The receiving material 12 is installed on the upper side of the gantry 10. However, in the Z direction, another member such as the first gutter member 16 described later may be sandwiched between the gantry 10 and the receiving material 12, and the receiving material 12 may be placed on the other member. The receiving material 12 is a member for installing the first plate material at the time of welding. That is, at the time of welding, the first plate material is placed on the receiving material 12 so as to be in contact with the uppermost surface. A second plate is welded onto the first plate. As shown in FIG. 2, the receiving members 12 extend, for example, along the X direction as the first direction, and a plurality of receiving members 12 are arranged at intervals in the Y direction. It is preferable that the receiving material 12 is arranged so that, for example, the main surface of the rectangle extends in the Z direction, that is, stands substantially perpendicular to the XY plane. From the above, it is preferable that the receiving material 12 has a rectangular flat plate shape that extends long (strip-shaped) in the X direction and has a thickness in the Y direction.

The water pipe 14 is a tubular member arranged in pairs so as to sandwich the receiving material 12 so as to be adjacent to each of the receiving materials 12 in the Y direction in a plan view. Therefore, the water pipe extends along the X direction. The water pipe 14 is made of a generally known vinyl. It is preferable that the water pipe 14 is arranged at the same position as the receiving material 12 in the Z direction. However, the water pipe 14 may be arranged at a position different from that of the receiving material 12 in the Z direction. In any case, the water pipe 14 is arranged on the lower side (hereinafter, simply lower side) in the Z direction of the first plate material installed on the receiving material 12, and is a cooling medium on the lower surface of the first plate material. For example, cooling water 14a can be supplied. Specifically, as shown in FIG. 4, a water supply unit 22 is connected to one end of the water pipe 14 in the X direction. Each water supply unit 22 can supply the cooling water 14a to the inside of each of the pair of water pipes 14 sandwiching the receiving material 12. Cooling water 14a is supplied from the water supply unit 22 into the water pipe 14 as shown by an arrow 14a _in the figure. The cooling water 14a flows in the water pipe 14 from the right side to the left side in FIG. 2, and is ejected from the injection portion 14b as a hole provided in the water pipe 14 to the outside of the water pipe 14. The ejected cooling water 14a is supplied to the lower surface of the first plate material. A plurality of injection portions 14b into which the cooling water 14a is injected from the water pipe 14 are arranged at a certain interval along the X direction in the water pipe 14. This interval may be substantially equal at each location as shown in FIG. 2, but the interval may be different at each location. The cooling medium is not limited to the cooling water 14a. For example, as the cooling medium, cold air that can be supplied to the lower surface of the first plate material by another member different from the water pipe 14 may be used.

The first gutter member 16 extends along the X direction like the receiving material 12 and the water pipe 14. The first gutter member 16 is placed on the uppermost surface of the plurality of pedestals 10 so as to straddle them by intersecting (for example, orthogonally) with the plurality of pedestals 10. The first gutter member 16 extends along the X direction, and a plurality of the first gutter members 16 are arranged at intervals in the Y direction. The first gutter member 16 has a lowermost rectangular bottom surface portion in the Z direction and a pair of side surface portions extending in the Z direction so as to be orthogonal to the bottom surface portion. In the first gutter member 16, one of a plurality of receiving members 12 and a pair of adjacent water pipes 14 so as to sandwich the receiving material 12 are (at least partially) in a portion surrounded by a bottom surface portion and a side surface portion. Arranged to be stowed. Therefore, the bottom surface of the first gutter member 16 extends from directly below the water pipe 14 to the periphery of the water pipe 14. In other words, the pair of water pipes 14 that sandwich the receiving material 12 are arranged in a region that overlaps with the first gutter member 16 in a plane. At least the bottom surface portion of the first gutter member 16 is arranged between the gantry 10 and the receiving member 12. Cooling water 14a injected from the injection portion 14b of the water pipe 14 is stored in a portion surrounded by the bottom surface portion and the side surface portion of the first gutter member 16.

The second gutter member 16a extends so as to intersect (for example, orthogonally) with the first gutter member 16 in a plan view, that is, along the Y direction as the second direction. Like the first gutter member 16, the second gutter member 16a has a shape having a bottom surface portion and a side surface portion. The second gutter member 16a is arranged one by one at a position continuous with each of one end portion and the other end portion in the X direction of the first gutter member 16 in a plan view. That is, as shown in FIG. 4, one end on the right side of the first gutter member 16 extending in the X direction substantially overlaps with the left edge portion of the second gutter member 16a extending in the Y direction. Further, the second gutter member 16a is arranged below the first gutter member 16. Therefore, the cooling water 14a collected in the first gutter member 16 can flow from the end of the first gutter member 16 into the second gutter member 16a as shown by the arrow 14a _out in the figure. In this way, the first gutter member 16 drains the cooling water 14a jetted from the water pipe 14 to the second gutter member 16a.

Similarly, as shown in FIG. 5, one end on the right side of the first gutter member 16 extending in the X direction substantially overlaps with the left edge portion of the second gutter member 16a extending in the Y direction. As a result, the cooling water 14a collected in the first gutter member 16 can flow from the end of the first gutter member 16 into the second gutter member 16a as shown by the arrow 14a _out in the figure. It should be noted that one end portion and the other end portion of the first gutter member 16 may be arranged so as to overlap with or near the central portion in the width direction (left-right direction) of the second gutter member 16a. In this case as well, the cooling water 14a in the first gutter member 16 can be made to flow in the second gutter member 16a. A vinyl water pipe plug 24 is provided at the most downstream end of the water pipe 14. The end of the water pipe 14 is blocked by the water pipe plug 24.

In the welding system 100 of FIG. 2, the first plate material is placed so as to cover the area where the plurality of receiving materials 12 are lined up and the outer peripheral portion thereof from above, particularly during the welding operation. That is, the first plate material is a thin plate material having a main surface having a size that covers almost the entire welding system 100 of FIG. The restraint member 18 of the welding system 100 of FIG. 2 is placed on the first surface of the placed first plate material, and a downward force can be applied to the first surface.

Specifically, as shown in FIG. 6, the restraint member 18 of the present embodiment has a pressing member 18a, a rotation center 18b, and a pressing surface 18c. In FIG. 6, the first plate material 2 installed on the receiving material 12 and the end restraining material 19 which is a flat plate-shaped steel plate member placed on the upper surface thereof are a part of the pressing material 18a. It is pressed downward by the pressing surface 18c. As a result, the first plate material 2 is fixed to the welding system 100. Further, in FIG. 6, a second plate material 4 described later is shown on the first plate material 2. As shown in FIG. 2, a plurality of pressing members 18a of the restraining member 18 are arranged at one and the other ends of the welding system 100 in the X direction at intervals in the Y direction. Further, a plurality of pressing members 18a are arranged at one end and the other end of the welding system 100 in the Y direction at intervals in the X direction. For example, the pressing member 18a has a portion extending in the Z direction and a portion extending along the Y (X) direction relatively above the Z direction. That is, the pressing member 18a has a larger width in the Y (X) direction in the upper part in the Z direction than in the lower part. The lowermost surface of the portion where the width is increased is the pressing surface 18c, and a downward pressing force is applied to the end restraining material 19 or the like. However, FIG. 6 schematically shows the pressing material 18a, and the shape of the pressing material 18a is not limited to that shown in FIG.

The rotation center 18b may have an arbitrary hinge-like configuration in which the pressing member 18a can rotate around the rotation center 18b as shown in FIGS. 6A and 6B. For example, the rotation center 18b may be a so-called round steel having a cylindrical shape extending in the X (Y) direction at the end in the Y (X) direction in FIG. 2 of the welding system 100. For example, a through hole is formed in the pressing material 18a, and the rotation center 18b penetrates the through hole so that the pressing material 18a can rotate about the rotation center 18b.

In FIG. 6A, the pressing member 18a is in a state where the pressing surface 18c that actually contacts the object and applies a force to the pressing member 18c does not contact the end restraining member 19 that is the object and is tilted downward. be. In FIG. 6A, the pressing member 18a is separated from the member placed on the receiving member 12. However, the pressing member 18a in the state of FIG. 6A is rotated around the rotation center 18b in the direction of the arrow R in the figure. As a result, as shown in FIG. 6B, the pressing material 18a is in contact with the end restraining material 19 installed on the first plate material 2, and the downward pressure is applied to the first plate material 2 and the end restraining material 19. Is applied. In this way, the first plate material 2 is fixed to the welding system 100.

Next, a method of manufacturing a welded part using the welding system 100 of the present embodiment will be described with reference to FIGS. 7 to 9 and, if necessary, FIGS. 1 to 6.

FIG. 7 is a schematic perspective view showing a manufacturing process of a welded part using the welding system of the first embodiment. FIG. 8 is a schematic cross-sectional view showing an aspect in the manufacturing process of the portion along the line III-III in FIG. 2. FIG. 9 is a schematic cross-sectional view of a portion along the IX-IX line in FIG.

With reference to FIGS. 7 to 9, first, the first plate material 2 and the second plate material 4 are prepared. As shown in FIG. 9, the upper surface of the first plate material 2 having a size covering almost the entire surface of the welding system 100 is the first surface 2a, and the lower surface on the opposite side thereof is the second surface 2b. And. As shown in FIGS. 7 and 8, the second plate 4 is a rectangular and strip-shaped reinforcement having a length substantially equal to, for example, the length of the welding system 100 and the first plate 2 in FIG. 2 in the X direction. It is a member and a flexible material. The surface on the right side of the second plate material 4 in FIG. 9 is referred to as the third surface 4a, and the surface on the left side opposite to this is referred to as the fourth surface 4b.

The first plate material 2 and the second plate material 4 are installed in the welding system 100. Specifically, as shown in FIG. 7, a single large number so as to straddle the plurality of receiving materials 12 of the welding system 100 and so that the uppermost surface of the receiving materials 12 contacts the second surface 2b. The plate material 2 of 1 is placed. Further, as shown in FIG. 9, in the second plate material 4, the third surface 4a and the fourth surface 4b, which are the main surfaces thereof, are the first surface on the first surface 2a of the first plate material 2. It is arranged so as to be substantially perpendicular to 2a. At this time, as shown in FIG. 7, it is preferable that a plurality of the second plate members 4 are arranged on the first surface 2a at intervals in the Y direction. That is, it is preferable that each of the plurality of second plate members 4 is arranged so as to substantially overlap the receiving material 12 directly above each of the plurality of receiving materials 12 extending in the X direction, for example. As a result, the plurality of strip-shaped second plate members 4 are arranged so as to be substantially parallel to each other at substantially equal intervals in the Y direction.

Next, the second plate material 4 is welded onto the first surface 2a of the first plate material 2. Specifically, as shown in FIG. 9, for example, the end restraining material 19 is placed on the end of the first plate material 2. The end restraint 19 is, for example, a thin steel plate having a small rectangular main surface. As shown in FIG. 6B, the pressing member 18a of the restraining member 18 is rotated around the rotation center 18b so as to come into contact with the end restraining member 19 and apply downward pressure to the pressing member 18a. In this way, a downward restraining force is applied to the end portion of the first plate member 2 in the X (Y) direction by the restraining member 18. That is, in the welding step (for example, the fillet welding step described above), as described above, the first plate material 2 is placed on the first surface 2a and a downward force can be applied to the first surface 2a. The restraining member 18 is formed in a state where a downward force is applied on the first surface 2a of the first plate member 2.

With the binding force applied in this way, the cooling water 14a is supplied to the second surface 2b opposite to the first surface 2a of the first plate material 2. Specifically, the cooling water 14a is supplied from the water supply unit 22 into the water pipe 14, and the cooling water 14a flows through the water pipe 14. A plurality of injection portions 14b are formed in the water pipe 14 at intervals along the X direction. The cooling water 14a jetted from each of the plurality of jetting portions 14b is supplied onto the second surface 2b of the first plate material 2 with which the cooling water 14a is jetted. As described above, the cooling water 14a is injected from the water pipe 14 arranged on the second surface 2b side (lower side) of the first plate material 2.

In this way, the second plate member 4 is welded onto the first surface 2a while maintaining the state in which the cooling water 14a is supplied onto the second surface 2b. The welding step here is performed by a generally known welding torch, for example. That is, while moving the welding torch in the X direction, the second plate material 4 extending in a strip shape in the X direction is sequentially heated and welded to the first plate material 2. As a result, the welded portion 6 shown in FIG. 9 is formed at the boundary between the first plate material 2 and the second plate material 4. In this way, the second plate material 4 is welded (for example, fillet welding) onto the first surface 2a of the first plate material 2.

From the viewpoint of reliably injecting the cooling water 14a directly under the welded portion 6, the injection portion 14b in FIG. 9 has an angle slightly facing the receiving material 12 side from directly above (for example, about 5 ° or more and 10 ° or less). It is preferable that it is formed in such a manner.

Further, as shown in FIG. 9, the water pipe 14 is preferably placed on the water pipe fixing material 20 at a portion surrounded by the bottom surface portion and the side surface portion of the first gutter member 16. The receiving material 12 may also be placed on the water pipe fixing material 20.

In the above welding step, a part of the first plate material 2 is heated by the welding torch. This heated region moves, for example, along the extending X direction of one first plate 2. After the heat welding of one first plate material 2 is completed, for example, another first plate material 2 adjacent to the heat welding is heat-welded in the same procedure. During the heating by the welding, the portion of the second surface 2b of the first plate material 2 to which the first surface 2a and the second plate material 4 are to be welded (the welded portion 6 of FIG. 9 is formed). The injected cooling water 14a is supplied to a region that overlaps with the portion to be welded in a plane. Here, it is preferable that the cooling water 14a is supplied during all the heating times by welding. However, it is preferable that the cooling water 14a is supplied at least in a time of 80% or more of the time for heating by welding, more preferably in a time of 90% or more. Further, while the cooling water 14a is supplied, it is preferable that the cooling water 14a is discharged from all of the plurality of injection portions 14b. However, it is preferable that the cooling water 14a is supplied from at least 80% or more, preferably 90% or more of the whole. That is, at least most of the region directly below the region that should finally become the welded portion 6 is injecting the cooling water 14a for at least most of the time during which the heat welding is performed in any region. Is. As described above, the fillet welding process is performed. It is preferable that the cooling water 14a jetted from the water pipe 14 is scattered in the X direction for a distance corresponding to the distance between the pair of jetting portions 14b adjacent to each other in the X direction. As a result, almost all of the region between the pair of injection portions 14b adjacent to each other in the X direction is cooled by receiving the injection of the cooling water 14a. Then, the entire portion where the welded portion 6 to be formed in the X direction is to be formed is almost always subjected to the injection of the cooling water 14a while the heating is performed in some region.

It is confirmed that the region adjacent to the welded portion 6 has been cooled after the treatment such as fillet welding is completed for all the regions to be welded. After that, the supply of the cooling water 14a from the water supply unit 22 is stopped. Then, the restraining member 18 is removed from the first plate member 2. The welded parts of the first plate material 2 and the second plate material 4 are removed from above the receiving material 12.

Next, the action and effect of this embodiment will be described.

In the method for manufacturing welded parts according to the present embodiment, the first plate material 2 and the second plate material 4 are prepared. The second plate material 4 is welded onto the first surface 2a of the first plate material 2. In the welding step, cooling water 14a as a cooling medium is supplied to the second surface 2b opposite to the first surface 2a of the first plate material 2. The cooling water 14a is ejected from the water pipe 14 arranged on the second surface 2b side of the first plate material 2. During the heating by welding, the cooling water 14a jetted to the region of the second surface 2b where the first surface 1a and the second plate 4 are to be welded in a plane overlap with each other is supplied. Weld. In the welding step, the first plate material 2 is placed on the first surface 2a of the first plate material 2 and the restraining member 18 capable of applying a downward force to the first surface 2a causes the first plate material 2. It is performed in a state where a downward force is applied on the surface 2a of 1.

In the welded part by the above manufacturing method, the second plate material 4 welded as a bending-proof material suppresses unintended deformation such as bending, and the strength is increased. However, if the first plate material 2 is not cooled at the time of welding, the amount of heat applied to the first plate material 2 at the time of welding is large, so that the first plate material 2 in the welded part after welding is unintentionally warped or deformed. May cause. Therefore, if welding is performed by the above manufacturing method, the cooling water 14a can suppress unintended deformation of the first plate material 2 due to welding heat. Further, according to this method, the region where the first surface 2a and the second plate 4 of the second surface 2b should be welded is at least most of the time during which the heating of any region is performed by welding. At least most of it is cooled uniformly. For this reason, it is not necessary to synchronize the timing of both, for example, when heating and cooling are performed while the welding torch for heating and the ejection nozzle for cooling water move together. No matter how the moving speed of the weld torch is changed and which area the weld torch is heating, it has less influence on how the part to be welded is cooled. Therefore, it is possible to suppress unintended deformation of the first plate material 2 due to the timing difference between heating and cooling.

Further, the welding step is performed in a state where a downward force is applied to the first plate member 2 by the restraining member 18. Therefore, unintended deformation of the first plate material 2 due to welding heat can be suppressed. By using the application of the force by the restraining member 18 and the injection of the cooling water 14a from the water pipe 14 in combination, the effect of suppressing the deformation of the first plate material 2 is further enhanced.

In the method for manufacturing a welded part, the water pipe 14 extends along the X direction, which is the first direction in a plan view, and the cooling water 14a is spaced by the water pipe 14 along the X direction. It may be supplied onto the second surface 2b from each of the plurality of formed injection portions 14b. The distance between the injection portions 14b is adjusted so that the particles can be scattered in the X direction by a distance corresponding to the distance between the pair of injection portions 14b adjacent to each other in the X direction. As a result, the cooling water 14a jetted from the water pipe 14 is uniformly the first plate material almost all the time during the heating step in at least any region along the X direction of the portion to be welded. 2 can be cooled. Therefore, the effect of suppressing the deformation of the first plate material 2 is enhanced.

The welding system 100 according to the present embodiment welds the second plate material 4 on the first surface 2a of the first plate material 2. The welding system 100 includes a receiving material 12, a water pipe 14, and a first gutter member 16. The receiving material 12 installs the first plate material 2. The water pipe 14 is provided with cooling water 14a as a cooling medium on the second surface 2b of the first plate material 2 installed on the receiving material 12 on the side opposite to the first surface 2a to which the second plate material 4 is welded. Can be supplied. The first gutter member 16 extends from directly below the water pipe 14 to the periphery of the water pipe 14, and drains the cooling water 14a jetted from the water pipe 14. The water pipe 14 extends along the X direction, which is the first direction in the plan view. A plurality of injection portions 14b into which the cooling water 14a is injected from the water pipe 14 are arranged at intervals along the X direction in the water pipe 14. Further, a restraining member 18 is further provided which is placed on the first surface 2a of the first plate member 2 and can apply a downward force to the first surface 2a.

The cooling water 14a from the water pipe 14 can suppress unintended deformation of the first plate material 2 due to welding heat. The first gutter member 16 extends from directly below the water pipe 14 to the periphery of the water pipe 14, and the cooling water 14a jetted from the water pipe 14 can be drained. This makes it possible to prevent the cooling water 14a jetted from the water pipe 14 from randomly scattering.

Further, since a plurality of injection portions 14b for injecting the cooling water 14a are arranged at intervals along the X direction, at least most of the time during which any region is heated by welding, the second surface 2b. , At least most of the region where the first surface 2a and the second plate 4 should be welded is uniformly cooled. Therefore, changes in the heated location and time have less effect on how the part to be welded is cooled. Therefore, it is possible to suppress unintended deformation of the first plate material 2 due to the timing difference between heating and cooling. Further, by using the application of the force by the restraining member 18 and the injection of the cooling water 14a from the water pipe 14 in combination, the effect of suppressing the deformation of the first plate material 2 is further enhanced.

In the above welding system 100, the Y direction as a second direction intersecting the X direction at a position continuous with one end and the other end in the X direction of the first gutter member 16 in a plan view. A second gutter member 16a extending along the line may be further provided. As a result, the cooling water 14a stored in the first gutter member 16 from the water pipe 14 can be smoothly drained from the second gutter member 16a as shown in FIGS. 4 and 5.

In the above welding system 100, the receiving material 12 extends along the X direction, and the water pipes 14 are arranged in a pair so as to sandwich the receiving material 12 in the region where the first gutter member 16 overlaps in a plane. It may have been done. As a result, the cooling water 14a jetted from the water pipe 14 toward the first plate material 2 is supplied directly above the receiving material 12 directly below the portion to be welded to the second plate material 4, and the cooling efficiency is improved. Can be enhanced. The receiving material 12, the water pipe 14, and the first gutter member 16 used in the welding system 100 all extend along the X direction, and a plurality of them are arranged. By adjusting the spacing in the Y direction, for example, the second plate 4 can be welded to the first plate 2 having various sizes having different dimensions in the Y direction.

Further, each of the plurality of receiving members 12 arranged in FIG. 1 and the like has a rectangular main surface and has the same dimensions in the Z direction. That is, the uppermost surfaces of the plurality of receiving members 12 extend linearly, and their positions in the Z direction are substantially the same. As a result, the second plate material 4 can be stably welded onto the flat first plate material 2. However, in the welding system 100, the dimensions of each of the plurality of receiving materials 12 may change in the Z direction for each region, and the uppermost surface thereof may be curved, for example. For example, the size of the receiving material 12 in the central portion of the welding system 100 in the plan view is reduced so that the uppermost portion in the Z direction is lower, and then the uppermost portion in the Z direction is gradually increased toward the outside in the plan view. The size of the receiving material 12 may be increased as described above. In this way, the first plate material 2 placed so as to be in contact with the receiving material 12 has a central portion at the lowest position so as to follow the height of the receiving material 12 after welding. It can be processed into a so-called downwardly convex curved surface like the main body of a ship with the outside at a high position.

(Embodiment 2)
FIG. 10 is a schematic perspective view showing a manufacturing process of a welded part using the welding system of the second embodiment. FIG. 11 is a schematic cross-sectional view of a portion along the IX-IX line in FIG. 8 in the manufacturing process of the second embodiment. With reference to FIGS. 10 and 11, the welding system 100 of the present embodiment and the method of manufacturing a welded part using the same are basically the same as those of the first embodiment. Therefore, the same components as those in the first embodiment are designated by the same reference numerals, and the description of the same features as those in the first embodiment will not be repeated. However, in the present embodiment, the configuration of the restraint member 18 is different from that of the first embodiment.

Specifically, in the present embodiment, as the restraining member 18, a vise, that is, a mantis shrimp 18d is used instead of the members such as the pressing member 18a shown in FIGS. 7 to 9. The mantis shrimp 18d can sandwich the end restraining material 19 that can be placed on the first surface 2a of the first plate material 2 and the first plate material 2 directly below the end restraining material 19 from above and below them. Has a configuration. As shown in FIG. 11, for example, a fixing member 21 adjacent to the outside of the first gutter member 16 at the most end of one of the plurality of first gutter members 16 in the Y direction, and a fixing member 21 arranged on the fixing member 21. A gutter vise 18d may be installed so as to sandwich the first plate member 2 and the end restraining member 19 from above and below. A gap may exist in the Z direction between the fixing member 21 and the first plate member 2. As a result, the mantis shrimp vise 18d applies downward pressure to the first surface 2a of the first plate material 2 and the end restraining material 19 as in the first embodiment. Therefore, in the method for manufacturing a welded part of the present embodiment, the downward force applied on the first surface 2a in the welding step is installed on the first plate material 2 and the first plate material 2. It is applied by sandwiching the end restraining material 19 with the mantis shrimp vise 18d. By using the mantis shrimp vise 18d as the restraining member 18 in this way, the equipment becomes simpler than the case where the pressing material 18a of the first embodiment is used.

(Embodiment 3)
The third embodiment is roughly the same as the welding system 100 shown in the first embodiment, but is a more embodied version of the welding system 100 of the first embodiment. FIG. 12 is a schematic plan view showing the configuration of the welding system according to the third embodiment. FIG. 13 is a schematic cross-sectional view of a portion along the line XIII-XIII in FIG. With reference to FIGS. 12 to 13, the welding system 100 of the present embodiment has roughly the same configuration as the welding system 100 of the first embodiment, and therefore has the same components as those of the first embodiment. The description is not repeated as long as the functions and the like are the same. Further, also in the present embodiment, as in the first embodiment, the first plate material 2 is placed on the receiving material 12 housed in the first gutter member 16 of the welding system 100, and is substantially perpendicular to the receiving material 12. The second plate 4 is arranged so as to intersect with. Therefore, in each of the drawings after FIG. 12, the first plate material 2 and the second plate material 4 may be shown by dotted lines. The welding system 100 of this embodiment is provided with a handle member 30.

FIG. 14 is a schematic enlarged plan view of the region XIV surrounded by the dotted line in FIG. FIG. 15 is a schematic cross-sectional view of a portion along the XV-XV line in FIG. FIG. 16 is a schematic enlarged plan view of the region XVI surrounded by the dotted line in FIG. FIG. 17 is a schematic cross-sectional view of a portion along the XVII-XVII line in FIG.

With reference to FIGS. 14 to 17, in the present embodiment, the restraint member 28 is provided as the restraint member 18 of the first embodiment. The restraining member 28 has a hinge bolt 28a and a hinge bolt round steel 28b. The hinge bolt 28a is provided with a through hole in the head, and a male screw is formed in a portion extending straight other than the head. A spring 28c is provided so as to be wound around the outer periphery of the straight extending portion where the male screw of the hinge bolt 28a is formed. As shown in FIG. 17, for example, the hinge bolt 28a is arranged so that the head having a through hole is on the lower side in the Z direction and the portion where the male screw is formed is on the upper side in the Z direction. The hinge bolts 28a are substantially replaced with the pressing material 18a of the first embodiment, and a plurality of hinge bolts 28a are installed at intervals in the X direction. The hinge bolt round steel 28b is penetrated through the through hole of the hinge bolt 28a. One hinge bolt round steel 28b is arranged at one end and the other end of the welding system 100 in the Y direction. The hinge bolt round steel 28b is substantially the one in which the rotation center 18b of the first embodiment is replaced. The single hinge bolt round steel 28b may extend long in the X direction so as to straddle, for example, from the gantry 10 on the leftmost side in the X direction to the gantry 10 on the rightmost side in the X direction.

The end restraining material 29 corresponds to the end restraining material 19 of the first embodiment, and is installed so as to ride on the first plate material 2. The end restraining material 19 is restrained by the spring 28c so as not to move downward, and a downward force can be applied on the first surface 2a of the first plate material 2. The end restraint 29 is formed with through holes that penetrate a pair of rectangular main surfaces. The male threaded portion of the hinge bolt 28a penetrates the through hole (the spring 28c does not penetrate). The nut 28n is arranged above the portion of the hinge bolt 28a that penetrates the through hole of the end restraint member 29. The female screw formed on the nut 28n and the male screw of the hinge bolt 28a are fitted. The end restraining material 29 is restrained by the nut 28n so as not to move upward. The hinge bolt 28a is composed of a member in which a male screw is formed and extends straight up and down, a spring 28c, and a nut 28n. The end restraining material 29 is sandwiched from above and below by the nut 28n and the spring 28c. A plurality of end restraint members 29 are arranged at intervals in the X direction.

By adjusting the vertical positions of the spring 28c and the nut 28n, the vertical positions of the end restraint member 29 can be adjusted. The height of the uppermost portion of the receiving material 12 in the Z direction may differ depending on the positions of the receiving material 12 in the X direction and the Y direction. In such a case, it is practically useful to be able to adjust the height of the end restraining member 29 mounted on each receiving member 12 in the Z direction.

The handle member 30 has a handle 30a and a handle round steel 30b. The handle 30a is a portion of the handle member 30 that is actually rotated by the user. The handle 30a is arranged at the center of the XV-XV line in the Y direction, which is indicated by "30" in FIG. The handle 30a is a so-called round steel having a cylindrical shape extending in the Z direction as shown in FIG. 15 in the initial state in which the handle 30a is not rotated. The round steel handle 30b penetrates a through hole provided in a portion of the handle member 30, for example, a steel plate having a wide bottom in the Z direction of the handle 30a. The handle round steel 30b is arranged at one end and the other end of the welding system 100 in the Y direction, similarly to the hinge bolt round steel 28b. The handle round steel 30b may extend long in the X direction so as to straddle, for example, from the gantry 10 on the leftmost side in the X direction to the gantry 10 on the rightmost side in the X direction.

As shown in FIGS. 15 and 17, for example, a fixing member 31 as a steel plate is provided from the viewpoint of holding the hinge bolt round steel 28b from above the gantry 10 so as not to come off.

One handle round steel 30b is arranged on the upper side of the hinge bolt round steel 28b, for example, at a position adjacent to the hinge bolt round steel 28b in the Y direction. As a result, a pair of handle round steels 30b are arranged so as to sandwich one hinge bolt round steel 28b in the Y direction. It is preferable that at least a part of the surface of the pair of handle round steels 30b comes into contact with a part of the surface of the hinge bolt round steel 28b. With the above configuration, for example, when the user rotates the handle 30a, the rotational force is transmitted to the handle round steel 30b penetrating the handle 30a. By this rotational force, the rotational force is also transmitted to the hinge bolt round steel 28b that comes into contact with the handle round steel 30b, and the hinge bolt 28a rotates. The end restraint member 29 moves according to the direction of rotation of the hinge bolt 28a. This is because the end restraining material 29 is sandwiched from above and below and cannot move up and down. Specifically, for example, if the handle 30a is rotated in the counterclockwise direction in FIG. 15, the end restraining member 29 moves to the left so as to be separated from the first plate member 2. Further, if the handle 30a is rotated clockwise in FIG. 15, the end restraining material 29 approaches the first plate material 2 and moves to the right so as to press the first plate material 2. As described above, when the handle 30a is turned, the hinge bolt 28a rotates so as to match the handle 30a, and the end restraining material 29 applies a pressing force to the first plate material 2 or retreats to the first plate material 2. I'm sorry.

FIG. 18 is a schematic enlarged plan view of the region XVIII surrounded by the dotted line in FIG. FIG. 19 is a schematic cross-sectional view of a first example of a portion along the XIX-XIX line in FIG. With reference to FIGS. 18 and 19, at one and the other end of the welding system 100 in the X direction, a mantis shrimp 28d, an end restraint 29 and a screw rod 38d are installed. A plurality of these are provided at intervals in the Y direction. As shown in FIG. 19, the screw rod 38d extends in the Z direction, and a male screw is formed almost entirely thereof. A spring 38c is provided so as to be wound around the outer periphery of the straight extending portion of the screw rod 38d where the male screw is formed. The end restraining material 29 is restrained by the spring 38c so as not to move downward. Further, the end restraining material 29 is formed with a through hole penetrating the main surface of a pair of rectangles, and a nut 38n is arranged above the through hole. The screw rod 38d penetrates the through hole of the end restraining material 29 (the spring 38c does not penetrate). The female screw of the nut 38n fits with the male screw of the screw rod 38d. The end restraining material 29 is restrained by the nut 38n so as not to move upward. A screw rod 38d is composed of a member in which a male screw is formed and extends straight up and down, a spring 38c, and a nut 38n. The end restraining material 29 is sandwiched from above and below by the nut 38n and the spring 38c. As shown in FIG. 18, a pair of screw rods 38d are provided so as to sandwich the mantis shrimp vise 28d in the Y direction, and a pair of screw rod fixing members 32 are provided so as to sandwich these. A group of these mantis shrimp vise 28d, a screw rod 38d, a screw rod fixing member 32, and a first gutter member 16 are arranged so as to be arranged alternately in the Y direction. Also in this case, the vertical position of the end restraining member 29 can be adjusted by adjusting the vertical positions of the spring 38c and the nut 38n.

Note that FIG. 20 is a schematic cross-sectional view of a second example of the portion along the XIX-XIX line in FIG. In FIG. 19, a screw rod 38d is used as a member that penetrates the end restraint member 29. However, with reference to FIG. 20, a hinge bolt 28a may be used instead of the screw rod 38d at the position where the screw rod 38d is arranged in FIG. In this case, as in FIGS. 14 to 17, the hinge bolt 28a penetrates the through holes of the plurality of end restraint members 29, and the male screw portion of the hinge bolt 28a and the female screw of the nut 28n are fitted. The end restraint member 29 is sandwiched from above and below by the spring 28c and the nut 28n included in the hinge bolt 28a. Further, similarly to FIGS. 14 to 17, a plurality of hinge bolts 28a in FIG. 20 are arranged at intervals in the Y direction. A pair of one hinge bolt round steel 28b extending long in the Y direction so as to penetrate each hole of each hinge bolt 28a and one hinge bolt round steel 28b arranged above the hinge bolt round steel 28b in the X direction. The handle round steel 30b of the above may be arranged. In this case, a handle member 30 having a handle 30a for the end in the X direction and a handle round steel 30b is separately installed. Also in this case, it is preferable that at least a part of the surface of the pair of handle round steels 30b comes into contact with a part of the surface of the hinge bolt round steel 28b.

As shown in FIGS. 19 and 20, the gantry 10 and a member immediately above it (for example, the first gutter member 16 or the fixing member 21 in FIG. 11) may be fixed by a mantis shrimp 28d. This is not limited to the present embodiment, and may be the same in the first and second embodiments.

Next, the action and effect of this embodiment will be described.

In the present embodiment, the hinge bolt 28a is used instead of the pressing member 18a as the restraining member 18 of the first embodiment. By providing the nut 28n on the end restraining material 29, the male screw of the hinge bolt 28a and the nut 28n are fitted to each other, and the end restraining material 29 penetrating the hinge bolt 28a is the nut 28n and the spring 28c. Is sandwiched from above and below. As a result, it is possible to save the trouble of setting each of the plurality of end restraining members 19 so as to be sandwiched between the pressing member 18a or the mantis shrimp vise 18d as in the first and second embodiments. That is, the work efficiency of the installation process of the first plate material 2 and the like can be significantly improved as compared with the first embodiment and the like. By allowing the same (one) hinge bolt round steel 28b to penetrate through the through holes of the plurality of hinge bolts 28a, the plurality of end restraining materials 29 penetrating each of the plurality of hinge bolts 28a are hinged. This is because it can be driven as if they were connected and integrated as one extending along the bolt round steel 28b.

In the present embodiment, the pair of handle round steels 30b are arranged above the one hinge bolt round steel 28b so as to sandwich the one hinge bolt round steel 28b in the Y direction. Each of the handle round steel 30b is in at least partial contact with the hinge bolt round steel 28b. As a result, by turning the handle 30a, the force is smoothly transmitted from the handle round steel 30b to the hinge bolt round steel 28b. Therefore, the end restraining material 29 penetrated through the hinge bolt 28a can easily press the first plate material 2 or the like simply by turning the handle 30a.

If the handle round steel 30b does not exist on the hinge bolt round steel 28b, it is necessary to process the through hole of the hinge bolt 28a and the hinge bolt round steel 28b penetrating the through hole. However, according to the present embodiment, the presence of the handle round steel 30b that rotates the hinge bolt round steel 28b eliminates the need for processing to fix the hinge bolt 28a and the hinge bolt round steel 28b. This is because the force is transmitted from the handle 30a to the handle round steel 30b, and the rotational force is transmitted from there to the hinge bolt 28a, so that even if the force transmitted from the hinge bolt round steel 28b to the hinge bolt 28a is weak, it functions sufficiently. Is. As a result, the step of fixing the hinge bolt 28a and the hinge bolt round steel 28b can be omitted, and the work efficiency can be improved.

(Embodiment 4)
FIG. 21 is a schematic cross-sectional view of a first example of a portion corresponding to FIG. 9 in the fourth embodiment. FIG. 22 is a schematic cross-sectional view of a second example of the portion corresponding to FIG. 9 in the fourth embodiment. Since the welding system 100 of the present embodiment is basically the same as the welding system 100 of each of the above embodiments, detailed description will not be repeated. However, with reference to FIGS. 21 and 22, in the welding system 100 of the present embodiment, either the cooling medium holding material 13a or the cooling medium holding material 13b is attached to the receiving material 12.

The cooling medium holding material 13a is formed of, for example, a single piece of cloth that is resistant to heat and easily absorbs water. The cooling medium holding material 13a is arranged so as to cover the surface of the upper region including the uppermost portion in the Z direction of the receiving material 12, in other words, to be wound on the surface of the upper region of the receiving material 12. There is. The cooling medium holding material 13a includes a first portion that covers a part of a pair of surfaces of the receiving material 12 facing the positive and negative sides in the Y direction in almost the entire portion where the receiving material 12 extends long in the X direction. It has a second portion that covers the uppermost surface of the receiving material 12 in the Z direction so as to connect between the pair of surfaces. Therefore, the cooling medium holding material 13a extends along the X direction. The second portion is sandwiched between the uppermost surface of the receiving material 12 in the Z direction and the second surface 2b of the first plate material 2.

The cooling medium holding material 13b is formed of, for example, a cotton-like member that is resistant to heat, is nonflammable, easily absorbs water, and is easily deformed when a force is applied. The cooling medium holding material 13b, like the cooling medium holding material 13a, covers the surface of the upper region including the uppermost portion in the Z direction of the receiving material 12, in other words, on the surface of the upper region of the receiving material 12. It is arranged so that it can be wrapped around. Like the cooling medium holding material 13a, the cooling medium holding material 13b has a first portion and a second portion, and extends along the X direction. The second portion is sandwiched between the uppermost surface of the receiving material 12 in the Z direction and the second surface 2b of the first plate material 2. As a result, the cooling medium holding material 13b is greatly deformed in the sandwiching direction, and the dimension of the second portion in the Z direction is much smaller than that of the first portion.

21 and 22 show an example in which the welding system 100 of the first embodiment has cooling medium holding materials 13a and 13b. However, the present invention is not limited to this, and for example, the welding system 100 of the second embodiment shown in FIG. 11 or the welding system 100 of the third embodiment may have the cooling medium holding materials 13a and 13b.

The cooling medium holding materials 13a and 13b are formed of a cloth-like or cotton-like member that easily absorbs water. The cooling medium holding materials 13a and 13b can disperse and hold the cooling water injected from the water pipe 14 by absorbing the cooling water. This will be described below.

The injection portion 14b of the water pipe 14 has a certain distance in the X direction in which the water pipe 14 extends. Therefore, there may be a problem that the cooling water 14a does not reach the region of the first plate material 2 directly above the region between the injection portion 14b and the injection portion 14b adjacent to the injection portion 14b in the X direction due to scattering. However, the cooling medium holding materials 13a and 13b extending along the extending X direction of the receiving material 12 and wound around the surface of the receiving material 12 absorb the received cooling water and disperse and hold it. That is, the cooling medium holding materials 13a and 13b can absorb the cooling water 14a received from the injection unit 14b and permeate the entire cooling water 14a along the X direction or the like. Therefore, the cooling water 14a is also supplied to the region on the surface of the first plate material 2 where the cooling water 14a injected from the injection unit 14b is difficult to reach, via the cooling medium holding materials 13a and 13b. Therefore, the cooling water 14a cools the entire first plate material 2, so that the cooling effect of the first plate material 2 is enhanced. In this way, the cooling medium holding materials 13a and 13b can control the amount of the cooling medium reaching the first plate material 2 and the cooling effect of the first plate material 2 by the amount.

The features described in each of the above-described embodiments (each example included in the embodiment) may be applied so as to be appropriately combined within a technically consistent range.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

2 1st plate material, 2a 1st surface, 2b 2nd surface, 4 2nd plate material, 4a 3rd surface, 4b 4th surface, 6 welds, 10 mounts, 12 receiving materials, 13a, 13b Cooling medium holding material, 14 headrace pipe, 14a cooling water, 14b injection part, 16 first gutter member, 16a second gutter member, 18,28 restraint member, 18a pressing material, 18b rotation center, 18c pressing surface, 18d , 28d Shako Vise, 19, 29 End Restraint, 20 Water Conductor Fixing Material, 21,31 Fixing Member, 22 Water Supply, 24 Water Conductor Plug, 28a Hing Bolt, 28b Hing Bolt Round Steel, 28c, 38c Spring, 28n, 38n nuts, 30 handle members, 30a handles, 30b handle round steel, 32 screw rod fixing members, 38d screw rods, 100 welding system.

Claims (7)

The process of preparing the first plate material and the second plate material,
A step of welding the second plate material onto the first surface of the first plate material is provided.
In the welding step, a cooling medium is supplied to the second surface of the first plate material opposite to the first surface.
The cooling medium is ejected from a water pipe arranged on the second surface side of the first plate material.
During the heating by the welding, the cooling medium sprayed to the region of the second surface where the first surface and the second plate material are to be welded in a plane overlap is supplied. ,
In the welding step, the first plate material is placed on the first surface of the first plate material, and a restraining member capable of applying a downward force to the first surface material allows the first plate material to be welded. A method for manufacturing a welded part, which is performed with a downward force applied on the surface of 1. The water pipe extends along the first direction in a plan view and extends.
The welded component according to claim 1, wherein the cooling medium is supplied onto the second surface from each of a plurality of injection portions formed in the water pipe at intervals along the first direction. Manufacturing method. The downward force applied on the first surface in the welding step is such that the first plate material and the end restraining material installed on the first plate material are sandwiched by a vise. The method for manufacturing a welded part according to claim 1 or 2, which is applied by the above method. A welding system for welding a second plate material onto the first surface of the first plate material.
The receiving material for installing the first plate material and
A water pipe capable of supplying a cooling medium to the second surface of the first plate material installed on the receiving material, which is opposite to the first surface on which the second plate material is welded.
It is provided with a first gutter member that extends from directly below the water pipe to the periphery of the water pipe and drains the cooling medium jetted from the water pipe.
The water pipe extends along the first direction in a plan view and extends.
A plurality of injection portions for injecting the cooling medium from the water pipe are arranged at intervals along the first direction in the water pipe.
A welding system further comprising a restraining member placed on the first surface of the first plate material and capable of applying a downward force to the first surface. The first gutter member extends along a second direction intersecting the first direction at a position continuous with one end and the other end in the first direction in a plan view. The welding system according to claim 4, further comprising a second gutter member. The receiving material extends along the first direction, and the receiving material extends along the first direction.
The welding system according to claim 5, wherein the water pipes are arranged in a pair so as to sandwich the receiving material in a region where the water pipes are planarly overlapped with the first gutter member. The restraining member is a vise capable of sandwiching the end restraining material that can be placed on the first surface of the first plate material and the first plate material. The welding system according to any one of the above.

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