Manufacturing method for weld member

Abstract

To make a shape of a jointed part by welding smoother, in laser welding.SOLUTION: A manufacturing method for a weld member comprises a step of welding end faces of a thick plate and of a thin plate to each other to form a weld member, by emitting a laser beam, while making the end faces of the thick plate and of the thin plate butt to each other. An area to which the laser beam is emitted comprises a first area and a second area. The first area passes at least on the vicinity of the end face of the thick plate to heat corner parts of the end face of the thick plate to melt the parts. The second area passes on the vicinity of the corner parts of the thick plate melted by the first area and the vicinity of the end face of the thin plate to weld the end faces of the thick plate and of the thin plate to each other. Quantities of heat applied to the thick plate by the first area are larger than quantities of heat applied to the thin plate by the first area.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing a welded component formed by welding. [Background technology]

[0002] There is a known technique for butting together the end faces of multiple plate materials of different thicknesses and welding them together. According to the technique disclosed in Patent Document 1, the end faces of a thin plate and a thick plate are butted together and a laser beam is irradiated so as to penetrate the thin plate in the thickness direction to perform laser welding, thereby joining the end faces together. Thereafter, metal inert gas welding is performed targeting the corners of the welded end face of the thick plate, and the laser-welded joint is covered with metal melted by the metal inert gas welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-254689 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when both laser welding and metal-inert gas welding are performed as in the method disclosed in Patent Document 1, equipment is required for each welding method, which increases costs such as production costs and equipment costs. To reduce costs, it is desirable to perform welding using only laser welding.

[0005] On the other hand, when welding is performed solely by laser welding, adjusting the output of the laser beam to prevent the thin plate from melting may result in an insufficient amount of heat being applied to the thick plate, which may result in the corners of the end face of the thick plate not being melted, and the welded joint may not be smooth.

[0006] In one aspect of the present disclosure, it is desirable to smooth the shape of the welded joint in laser welding. [Means for solving the problem]

[0007] One aspect of the present disclosure is a method for manufacturing a welded member, comprising: butting an end face of a thick plate, which is a plate-like member, with an end face of a thin plate, which is a plate-like member thinner than the thick plate, and irradiating the thick plate and the thin plate with a laser beam to weld the end faces of the thick plate and the thin plate to form a welded member. The irradiation area, which is the area irradiated with the laser beam, moves from a start point to an end point on an irradiation path along the end faces of the thick plate and the thin plate. The irradiation area includes a first area and a second area. The first area passes near at least the end face of the thick plate, thereby heating and melting corners, which are the ends in the thickness direction of the end face of the thick plate. The second area passes near the corners of the thick plate melted by the first area and near the end face of the thin plate, thereby welding the end faces of the thick plate and the thin plate together. The amount of heat applied to the thick plate by the first area is greater than the amount of heat applied to the thin plate by the first area.

[0008] According to the above-described configuration, the corners of the end faces of the thick plates can be melted during welding, thereby making it possible to form a smooth joint by welding. In one embodiment of the present disclosure, the first region and the second region may be located apart.

[0009] According to the above configuration, welding can be performed well. In one aspect of the present disclosure, the first region may be displaced on the irradiation path while being positioned so as to straddle the thick plate and the thin plate.

[0010] According to the above configuration, since the thin plate is heated when the corner of the thick plate is melted, when the molten material flows toward the thin plate, the temperature on the thin plate can be prevented from dropping and solidifying, thereby making it possible to form a smooth welded joint.

[0011] In one embodiment of the present disclosure, the first region and the second region may be formed by branching a laser beam emitted from a single light source. According to the above configuration, a plurality of irradiation areas can be formed using one light source, and therefore, the cost of equipment for welding can be reduced.

[0012] In one embodiment of the present disclosure, the first region may include a first main region and a first sub-region. The first sub-region is disposed closer to the starting point of the irradiation path than the first main region and does not overlap with the first main region. The first main region may pass near at least an end face of the thick plate, thereby heating and melting a portion near the end face, including a corner of the thick plate. The first sub-region may pass near a boundary between a region of the thick plate that is not passed through by the first main region and a region that is passed through by the first main region, thereby heating and melting the portion.

[0013] According to the above configuration, the area of ​​the thick plate near the boundary between the area where the first area does not pass and the area where the first area passes can be made to have a smooth shape. In one embodiment of the present disclosure, the second region may include a second preliminary region and a second main region. The second preliminary region may heat the thick plate and the thin plate by passing through the thick plate and the thin plate. The second main region may weld end surfaces of the thick plate and the thin plate by passing through a region of the thick plate and the thin plate that the second preliminary region passed through. The power density of the second main region may be higher than the power density of the second preliminary region.

[0014] According to the above configuration, the portions of the thick plate and thin plate through which the second main region passes can be preheated by the second preliminary region. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 10 is an explanatory diagram showing a thick plate and a thin plate viewed from above. [Figure 2] FIG. 1 is an explanatory diagram of a laser device. [Figure 3] FIG. 4 is an explanatory diagram showing a state in which a laser beam is irradiated onto a first region. [Figure 4] FIG. 10 is an explanatory diagram showing a state in which a laser beam is irradiated onto a second region. [Figure 5] FIG. 10 is an explanatory diagram showing the positions of the first region and the second region in another embodiment. [Figure 6] 6A to 6D are explanatory diagrams showing the shapes of the first region and the second region in another embodiment. [Figure 7] FIG. 10 is an explanatory diagram showing the positions of the first main region and the first sub-region in another embodiment. [Figure 8] FIG. 10 is an explanatory diagram showing the positions of the second preliminary area and the second main area in another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First embodiment] [1-1. Overview] In this embodiment, a welded member 3 is manufactured by welding together a thick plate 1 and a thin plate 2, which are plate-shaped members, using a laser device 4 (see FIGS. 1 to 4). As an example, the thick plate 1 and the thin plate 2 are both galvanized steel plates, and have a rectangular shape that extends in a plane. However, the present invention is not limited to this, and the thick plate 1 and the thin plate 2 may be made of a steel material other than stainless steel, or may be made of a metal other than steel. The shapes of the thick plate 1 and the thin plate 2 are determined as appropriate.

[0017] The thickness of the thin plate 2 is smaller than that of the thick plate 1. As an example, the thickness of the thick plate 1 is 1.0 mm, and the thickness of the thin plate 2 is 0.6 mm. However, this is not limited to this, and the combination of the thicknesses of the thick plate 1 and the thin plate 2 may be, for example, 1.6 mm for the thick plate 1 and 1.4 mm for the thin plate 2. Furthermore, the combination of the thicknesses of the thick plate 1 and the thin plate 2 may be, for example, 1.8 mm for the thick plate 1 and 0.6 mm for the thin plate 2.

[0018] [1-2. Laser device] The laser device 4 includes a laser oscillator 40, an optical path 41, and a head 42, and is configured to irradiate the thick plate 1 and the thin plate 2 with a laser beam L from the head 42 (see FIG. 2).

[0019] The laser oscillator 40 generates a laser beam by exciting a laser medium and amplifying the light emitted from the excited laser medium. As an example, the laser oscillator 40 may be configured as a fiber laser that uses an optical fiber as an amplifying medium.

[0020] The optical path 41 guides the laser beam generated by the laser oscillator 40 to the head 42 . The head 42 includes a DOE (Diffractive Optical Element) 43 and a focus lens 44 .

[0021] The DOE 43 splits the laser beam that has passed through the optical path 41. The laser beam L split by the DOE 43 is emitted from the head . The focus lens 44 is a component that adjusts the aperture of the laser beam L. During welding, the aperture of the laser beam L is adjusted so that the laser beam L converges just before the thick plate 1 and the thin plate 2.

[0022] The laser beam L can be generated by various methods other than the above. Specifically, for example, the laser beam L may be generated by a branching mirror instead of the DOE 43. Furthermore, for example, the laser beam L may be generated by a PLC splitter that branches one optical fiber into multiple optical fibers instead of the DOE 43.

[0023] [1-3. Manufacturing methods for welded components] The manufacturing method of the welded member 3 includes an arrangement process in which an end face 10 forming one side of the thick plate 1 and an end face 20 forming one side of the thin plate 2 are arranged so as to butt against each other, and a welding process in which the thick plate 1 and the thin plate 2 are welded together using a laser device 4 to form the welded member 3.

[0024] [(1) Placement process] First, in the placement process, the thick plate 1 and the thin plate 2 are placed on a workbench with the thick plate 1 and the thin plate 2 spread out horizontally and with the end faces 10, 20 of the thick plate 1 and the thin plate 2 abutting each other (see FIG. 1). The upper faces of the thick plate 1 and the thin plate 2 placed on the workbench are referred to as first faces 11, 21, and the faces opposite the first faces 11, 21 are referred to as second faces 12, 22. The ends of the end faces 10, 20 on the first face 11, 21 side are referred to as corners 13, 23. Note that the thickness of the thin plate 2 is smaller than that of the thick plate 1, so a step is formed between the first face 11 and the first face 21.

[0025] [(2) Welding process] Next, in the welding process, a laser beam L is irradiated onto the thick plate 1 and the thin plate 2 that have been placed on the work table in the placement process (see FIG. 1). Specifically, the laser beam L is irradiated from the head 42 of the laser device 4 onto the vicinity of the end faces 10 and 20 on the first surfaces 11 and 21 of the thick plate 1 and the thin plate 2.

[0026] The laser device 4 displaces the irradiation area, which is the area irradiated with the laser beam L, in the first direction D1 along the end faces 10, 20 from the first ends 10A, 20A to the second ends 10B, 20B of the end faces 10, 20 by displacing the head 42. However, this is not limited to this, and for example, instead of displacing the head 42, the irradiation area may be displaced by moving the work table to displace the positions of the thick plate 1 and the thin plate 2. The path along which the irradiation area moves along the end faces 10, 20 is referred to as the irradiation path.

[0027] The irradiation area includes a first area 5 and a second area 6. The first area 5 and the second area 6 are generated by a split laser beam L. The first region 5 is a circular region located near the end face 10 on the first surface 11 of the thick plate 1. As an example, the first region 5 overlaps the ridge line 14, which is the boundary between the end face 10 and the first surface 11 of the thick plate 1. However, this is not limiting, and the first region 5 does not have to overlap the ridge line 14. Furthermore, in this embodiment, the first region 5 does not overlap the thin plate 2. Therefore, the amount of heat applied to the thick plate 1 by the first region 5 is greater than the amount of heat applied to the thin plate 2 by the first region 5.

[0028] The second region 6 is a circular region arranged across the first surfaces 11, 21 of the thick plate 1 and the thin plate 2. The first region 5 and the second region 6 are positioned apart. In other words, the first region 5 does not overlap with the second region 6, and the first region 5 does not contact the second region 6. Furthermore, the second region 6 is arranged on the first end 10A, 20A side of the irradiation path relative to the first region 5.

[0029] In the welding process, the first region 5 passes near the end face 10 on the first surface 11 of the thick plate 1 in a first direction D1 along the end face 10. As a result, the corner 13 of the thick plate 1 is heated and melted (see FIG. 3). The molten material, molten metal 7, flows toward the thin plate 2.

[0030] Next, the second region 6 passes near the corner 13 of the thick plate 1 and near the end face 20 of the thin plate 2, which have been melted by the first region 5, along the end faces 10, 20 in the first direction D1. As a result, the areas around the end faces 10, 20 are heated and melted, and the molten material solidifies to form a joint 8 (see FIG. 4). As a result, the thick plate 1 and the thin plate 2 are welded together, and a welded member 3 is formed.

[0031] [1-4.Effects] (1) According to the above embodiment, when the thick plate 1 and the thin plate 2 are welded to form the welded member 3, the thick plate 1 can be heated by the first region 5 to melt the corner 13. Therefore, the joint 8 can be formed into a smooth shape.

[0032] (2) Furthermore, since the first region 5 is located on the thick plate 1 and does not overlap the thin plate 2, the amount of heat applied to the thick plate 1 by the first region 5 is greater than the amount of heat applied to the thin plate 2 by the first region 5. Therefore, when the corner 13 is heated and melted by the first region 5, the thin plate 2 can be prevented from being overheated by the first region 5 and melting off.

[0033] (3) The first region 5 and the second region 6 are formed by branching and irradiating a laser beam emitted from one laser oscillator 40. That is, there is no need to use multiple laser oscillators when forming the first region 5 and the second region 6, which reduces the cost of equipment for welding.

[0034] [1-5. Correspondence of Wording] In the above embodiment, the laser oscillator 40 corresponds to an example of a light source. The first ends 10A and 20A correspond to an example of a starting point, and the second ends 10B and 20B correspond to an example of an ending point.

[0035] 2. Other Embodiments (1) In the above embodiment, the first region 5 is located on the thick plate 1 and does not overlap the thin plate 2. However, the first region 5 may be arranged so as to overlap the thick plate 1 and the thin plate 2 (see FIG. 5). With this configuration, when the corner 13 of the thick plate 1 is heated and melted by the first region 5, the first surface 21 of the thin plate 2 adjacent to the corner 13 can also be heated. Therefore, when the molten metal 7 flows from the thick plate 1 toward the thin plate 2, the temperature of the molten metal 7 that has flowed onto the first surface 21 of the thin plate 2 can be prevented from dropping and solidifying. This allows the joint 8 to have a smooth shape.

[0036] (2) In the above embodiment, both the first region 5 and the second region 6 are circular regions. However, the shapes of the first region 5 and the second region 6 are not limited to circular. For example, the first region 5 may be elongated and extend in an arc (see FIG. 6A), rectangular (see FIG. 6B), or triangular (see FIG. 6C). Furthermore, for example, the second region 6 may be rectangular (see FIG. 6D).

[0037] (3) In the above embodiment, the first region 5 is a single region. However, this is not limiting, and the first region 5 may include, for example, a first main region 50 and a first sub-region 51 (see FIG. 7).

[0038] The first main region 50 is a circular region located near the end face 10 on the first surface 11 of the thick plate 1. The first main region 50 passes near the end face 10 on the first surface 11 of the thick plate 1 in a first direction D1 along the end face 10. As a result, the area of ​​the thick plate 1 near the end face 10, including the corner 13, is heated and melted. The area on the first surface 11 of the thick plate 1 through which the first main region 50 passes is referred to as a passing region 50A. The boundary between the passing region 50A and the area on the first surface 11 of the thick plate 1 through which the first main region 50 does not pass is referred to as a boundary portion 50B.

[0039] The first sub-region 51 is a circular region located on the first end 10A side of the irradiation path relative to the first main region 50. The first sub-region 51 does not overlap the first main region 50. The first sub-region 51 is located so as to overlap the boundary portion 50B. The first sub-region 51 passes through a portion of the thick plate 1 near the boundary portion 50B in the first direction D1 along the end face 10. As a result, the portion of the thick plate 1 near the boundary portion 50B is heated and melted.

[0040] With this configuration, when there is a large difference in thickness between the thick plate 1 and the thin plate 2, the material in the passage region 50A of the thick plate 1 may melt in the first main region 50 and flow toward the thin plate 2, forming a corner-shaped portion near the boundary 50B. In contrast, the first sub-region 51 can melt the portion, thereby making it possible to form a smooth shape near the boundary 50B.

[0041] (4) In the above embodiment, the second area 6 is a single area. However, this is not limiting, and the second area 6 may include, for example, a second main area 60 and a second auxiliary area 61 (see FIG. 8).

[0042] The second main region 60 is a circular region arranged across the first surfaces 11, 21 of the thick plate 1 and the thin plate 2. The second main region 60 passes through the region of the thick plate 1 and the thin plate 2 that the second preliminary region 61 passed through, along the end faces 10, 20, in the first direction D1. As a result, the areas around the end faces 10, 20 are heated and melted, and the molten material solidifies to form the joint 8.

[0043] The second preliminary region 61 is an annular region arranged so as to surround the periphery of the second main region 60. However, the second preliminary region 61 is not limited to this, and may be a region that does not surround the periphery of the second main region 60, but is instead arranged on the second end 10B, 20B side of the irradiation path relative to the second main region 60.

[0044] The second preliminary region 61 passes near the end faces 10, 20 of the thick plate 1 and the thin plate 2 along the end faces 10, 20 in the first direction D1. As a result, the regions of the thick plate 1 and the thin plate 2 through which the second main region 60 passes are preheated by the second preliminary region 61. The power density of the second main region 60 is higher than the power density of the second preliminary region 61. The power density is the output of the laser beam per area of ​​each region. The unit of power density is, for example, W / cm. 2 is.

[0045] With this configuration, when the thick plate 1 and the thin plate 2 are welded together by the second main region 60, the area through which the second main region 60 passes can be preheated by the second preliminary region 61. This makes it possible to prevent a sudden rise in temperature during welding and suppress the occurrence of spatter.

[0046] (5) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0047] [3. Technical Ideas Disclosed in the Present Specification] [Item 1] A method for manufacturing a welded member, comprising: forming the welded member by welding the end surface of the thick plate and the end surface of the thin plate, which is a plate-like member having a thickness smaller than that of the thick plate, together with a laser beam irradiated onto the thick plate and the thin plate in a state where the end surface of the thick plate and the thin plate are butted against each other; an irradiation area, which is an area irradiated with the laser beam, is displaced from a start point to an end point on an irradiation path along the end surfaces of the thick plate and the thin plate; The illumination area includes a first area and a second area, The first region passes through at least the vicinity of the end face of the thick plate, thereby heating and melting a corner portion, which is an end portion in the thickness direction of the end face of the thick plate, the second region passes through the vicinity of the corner of the thick plate and the vicinity of the end surface of the thin plate melted by the first region, thereby welding the end surfaces of the thick plate and the thin plate together; the amount of heat applied to the thick plate by the first region is greater than the amount of heat applied to the thin plate by the first region; A method for manufacturing welded components.

[0048] [Item 2] A method for manufacturing a welded component according to item 1, The first region and the second region are spaced apart from each other. A method for manufacturing welded components.

[0049] [Item 3] A method for producing a welded member according to item 1 or 2, The first region is displaced on the irradiation path while being positioned so as to straddle the thick plate and the thin plate. A method for manufacturing welded components.

[0050] [Item 4] A method for producing a welded component according to any one of items 1 to 3, the first region and the second region are formed by branching the laser beam emitted from one light source. A method for manufacturing welded components.

[0051] [Item 5] A method for producing a welded member according to any one of items 1 to 4, the first region includes a first main region and a first sub-region that is disposed closer to the starting point in the irradiation path than the first main region and does not overlap with the first main region; the first main region passes through at least the vicinity of the end surface of the thick plate, thereby heating and melting a portion of the thick plate near the end surface, including the corner portion; The first sub-region passes through a region of the thick plate near a boundary between a region through which the first main region does not pass and a region through which the first main region passes, thereby heating and melting the region. A method for manufacturing welded components.

[0052] [Item 6] A method for producing a welded member according to any one of items 1 to 5, the second area includes a second preliminary area and a second main area, The second preliminary region heats the thick plate and the thin plate by passing through the thick plate and the thin plate; the second main region passes through a region of the thick plate and the thin plate through which the second preliminary region passed, thereby welding the end surfaces of the thick plate and the thin plate together; The power density of the second main region is higher than the power density of the second preliminary region. A method for manufacturing welded components. [Explanation of symbols]

[0053] 1...thick plate, 10...end surface, 13...corner, 2...thin plate, 20...end surface, 3...welding member, 5...first region, 6...second region, 50...first main region, 51...first sub-region, 60...second main region, 61...second auxiliary region, L...laser beam.

Claims

1. A method for manufacturing a welded member, comprising: forming the welded member by welding the end surface of the thick plate and the end surface of the thin plate, which is a plate-like member having a thickness smaller than that of the thick plate, together with a laser beam irradiated onto the thick plate and the thin plate in a state where the end surface of the thick plate and the thin plate are butted against each other; an irradiation area, which is an area irradiated with the laser beam, is displaced from a start point to an end point on an irradiation path along the end surfaces of the thick plate and the thin plate; The illumination area includes a first area and a second area, The first region passes through at least the vicinity of the end surface of the thick plate, thereby heating and melting a corner portion, which is an end portion in a thickness direction of the end surface of the thick plate, the second region passes through the vicinity of the corner of the thick plate and the vicinity of the end surface of the thin plate melted by the first region, thereby welding the end surfaces of the thick plate and the thin plate together; the amount of heat applied to the thick plate by the first region is greater than the amount of heat applied to the thin plate by the first region; A method for manufacturing welded components.

2. 2. The method for manufacturing a welded member according to claim 1, The first region and the second region are spaced apart from each other. A method for manufacturing welded components.

3. 2. The method for manufacturing a welded member according to claim 1, The first region is displaced on the irradiation path while being positioned so as to straddle the thick plate and the thin plate. A method for manufacturing welded components.

4. 2. The method for manufacturing a welded member according to claim 1, the first region and the second region are formed by branching the laser beam emitted from one light source; A method for manufacturing welded components.

5. A method for manufacturing a welded member according to any one of claims 1 to 4, the first region includes a first main region and a first sub-region that is disposed closer to the starting point in the irradiation path than the first main region and does not overlap with the first main region; the first main region passes through at least the vicinity of the end surface of the thick plate, thereby heating and melting a portion of the thick plate near the end surface, including the corner portion; The first sub-region passes through a region of the thick plate near a boundary between a region through which the first main region does not pass and a region through which the first main region passes, thereby heating and melting the region. A method for manufacturing welded components.

6. A method for manufacturing a welded member according to any one of claims 1 to 4, the second area includes a second preliminary area and a second main area, The second preliminary region passes through the thick plate and the thin plate to heat the thick plate and the thin plate, the second main region passes through a region of the thick plate and the thin plate through which the second preliminary region passed, thereby welding the end surfaces of the thick plate and the thin plate together; The power density of the second main region is higher than the power density of the second preliminary region. A method for manufacturing welded components.

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