Weldment manufacturing method, weldment and weldment repair method

Abstract

To provide a weldment manufacturing method capable of suppressing weldment deformation, and a weldment.SOLUTION: A weldment manufacturing method includes: a recess forming step of forming recesses in a first target member and a second target member, the recesses being a plurality of holes across the first target member and the second target member on a boundary between the first target member and the second target member when the first target member and the second target member being bonding targets are abutted against each other; abutment step of abutting the first target member and the second target member against each other while aligning positions of the recesses so that a plurality of holes are formed; and welding step of arranging a filler material inside of the plurality of holes, performing laser irradiation while scanning to melt the filler material, and filling the holes with the molten filler material.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to methods of manufacturing weldments, weldments, and weldment repair methods. [Background technology]

[0002] As a welding method for joining pressed steel plates, for example, narrow-gap laser welding is known (see, for example, Patent Document 1). In such narrow-gap laser welding, thick steel plates are arranged with a small gap (groove) in between, a filler material such as a wire is supplied into the gap, a laser is irradiated onto the filler material to melt the wire and form a weld, and the weld is layered in the depth direction of the gap. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-178130 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned narrow gap laser welding, a groove must be provided between the pressed steel plates, which causes a problem that welding deformations such as angular distortion, lateral shrinkage, and longitudinal shrinkage become large when the filler metal is melted.

[0005] At least one embodiment of the present disclosure has been made in consideration of the above circumstances, and has an object to provide a welded product manufacturing method and a welded product that are capable of suppressing welding distortion. [Means for solving the problem]

[0006] The welded product manufacturing method according to the present disclosure includes a recess forming process for forming recesses in a first target member and a second target member, which are to be joined, on a boundary line between the first target member and the second target member when the first target member and the second target member are butted together, a butting process for butting the first target member and the second target member by aligning the positions of the recesses so that the multiple holes are formed, and a welding process for placing a filler metal inside the multiple holes, irradiating the laser while scanning it to melt the filler metal, and filling the holes with the melted filler metal.

[0007] The welded product manufacturing method according to the present disclosure includes a first target member and a second target member, and a weld that joins the first target member and the second target member, wherein the first target member and the second target member are butted together so that a plurality of holes spanning the first target member and the second target member are formed on a boundary line between the first target member and the second target member, and the weld is positioned so as to fill the plurality of holes.

[0008] The welded article according to the present disclosure comprises a first target member and a second target member, and a weld joining the first target member and the second target member, wherein the first target member and the second target member are butted together so that a plurality of holes spanning the first target member and the second target member are formed on the boundary line between the first target member and the second target member, and the weld is positioned so as to fill the plurality of holes.

[0009] A weldment repair method according to the present disclosure includes the steps of forming a repair hole in the weld of the above-mentioned weldment, placing a filler metal inside the repair hole, irradiating the weld with a laser while scanning it to melt the filler metal, and filling the repair hole with the melted filler metal to form a weld repair portion. Effect of the Invention

[0010] According to at least one embodiment of the present disclosure, a weldment manufacturing method and a weldment capable of suppressing welding distortion can be provided. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a welding system according to a first embodiment. [Diagram 2] FIG. 2 is a flowchart showing an example of a method for manufacturing a welded product according to this embodiment. [Diagram 3] FIG. 3 is a process diagram showing each process of the welded product manufacturing method according to this embodiment. [Figure 4] FIG. 4 is a process diagram showing each process of the welded product manufacturing method according to this embodiment. [Diagram 5] FIG. 5 is a diagram showing a configuration along the cross section AA in FIG. 3 (ST3). [Figure 6] FIG. 6 is a diagram showing a configuration along the cross section AA in FIG. 3 (ST3). [Figure 7] FIG. 7 is an explanatory diagram showing an example of a trajectory along which a laser is scanned. [Figure 8] FIG. 8 is an explanatory diagram showing an example of a trajectory along which the laser is scanned. [Figure 9] FIG. 9 is an explanatory diagram showing an example of a trajectory along which the laser is scanned. [Figure 10] FIG. 10 is a flowchart showing an example of a method for manufacturing a welded product according to the second embodiment. [Figure 11] FIG. 11 is a process diagram showing each process of the welded product manufacturing method according to this embodiment. [Figure 12] FIG. 12 is a process diagram showing each process of the welded product manufacturing method according to this embodiment. [Figure 13] FIG. 13 is a diagram showing an example of a method for manufacturing a welded product according to the third embodiment. [Figure 14] FIG. 14 is a diagram showing an example of a method for manufacturing a welded product according to the fourth embodiment. [Figure 15] FIG. 15 is a diagram showing an example of a welded product according to a modified example. [Figure 16] FIG. 16 is a diagram showing an example of a welded product manufacturing method according to a modified example. [Figure 17]FIG. 17 is a diagram showing an example of a welded product manufacturing method according to a modified example. [Figure 18] FIG. 18 is a diagram showing an example of a welded product manufacturing method according to a modified example. [Figure 19] FIG. 19 is a diagram illustrating an example of a weldment repair method according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of a weldment manufacturing method and a weldment according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to the embodiment. In addition, the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same.

[0013] [First embodiment] FIG. 1 is a schematic diagram showing a schematic configuration of a welding system according to a first embodiment. The welding system 100 welds a first target member 10 and a second target member 20 to be joined. The first target member 10 and the second target member 20 are, for example, metal materials, and a rolled steel plate having a thickness of 100 mm or more is used. As shown in FIG. 1, the welding system 100 has a laser processing device 30, a filler metal feeding device 40, and a control device 50. The welding system 100 may also have a fixing mechanism for fixing the first target member 10 and the second target member 20, a moving mechanism for adjusting the relative positions of the first target member 10 and the second target member 20 and each of the above devices, and the like.

[0014] The laser processing device 30 has a laser irradiation device 31 and a laser scanning device 32. The laser irradiation device 31 outputs a laser. As the laser irradiation device 31, a fiber laser output device or a short pulse laser output device can be used. As the fiber laser output device, for example, a Fabry-Perot type fiber laser output device or a ring type fiber laser output device can be used, and a laser is oscillated by exciting these output devices. As the fiber of the fiber laser output device, for example, silica glass to which a rare earth element such as erbium (Er), neodymium (Nd), or ytterbium (Yb) is added can be used. Note that, in this embodiment, a laser that oscillates in the order of microseconds or pulses shorter than that, such as a YAG laser or a YVO4 laser, can also be used as the fiber laser (first laser) L1. As the short pulse laser output device, for example, a titanium sapphire laser can be used as a laser oscillation source, and a pulse with a pulse width of 100 picoseconds or shorter can be oscillated. Here, in this embodiment, the short pulse laser outputs a laser with a short pulse with a pulse width of 100 microseconds or shorter. In addition, the short-pulse laser L2 of the laser processing unit 22 is preferably a laser having a short pulse with a pulse width of 100 nanoseconds or less, and more preferably a laser having a pulse width of less than 1 nanosecond.

[0015] The laser irradiation device 31 preferably outputs a laser of 0.5 kW or more and 10 kW or less, and more preferably outputs a laser of 3 kW or more and 9 kW or less. The laser irradiation device 31 preferably irradiates a laser with a beam diameter of 0.6 mm or more and 1.6 mm or less.

[0016] The laser irradiation device 31 may be a high-power laser, for example, a single mode laser having a small laser diameter so that the scanning pattern can be controlled more precisely, or a multi-mode laser.

[0017] The laser scanning device 32 irradiates the hole H with the laser irradiated from the laser irradiation device 31 while scanning. The laser scanning device 32 has a first galvanometer mirror 33 and a second galvanometer mirror 34. The first galvanometer mirror 33 and the second galvanometer mirror 34 change the direction of reflection of the laser irradiated from the laser irradiation device 31 by changing the direction of the mirror. The laser scanning device 32 changes the position of the laser irradiated to the welded object 30 on a two-dimensional plane by making the rotation direction of the mirror of the first galvanometer mirror 33 and the rotation direction of the mirror of the second galvanometer mirror 34 different directions. The laser scanning device 32 preferably scans the laser at 1 m / sec or more and 10 m / sec or more.

[0018] When a pulsed laser is used, the laser processing device 30 irradiates the laser at intervals of 1 mm or less. The laser irradiation time is preferably from 1 to 30 seconds, and more preferably from 5 to 21 seconds.

[0019] The laser processing device 30 may be capable of scanning the irradiated laser. For example, the laser processing device 30 may be configured to have a large number of laser elements for irradiating a laser, and to scan the laser irradiation position by switching the laser elements for irradiating the laser.

[0020] The filler metal supplying device 40 supplies a filler metal of a predetermined size corresponding to the size of the hole H formed when the first target member 10 and the second target member 20 are butted together, into the hole H. As the filler metal, at least one of a cut wire, a powder, a base material on a block, etc. can be used. Also, a linear wire can be continuously supplied as the filler metal. The filler metal supplying device 40 may be provided with a plurality of filler metals of a predetermined size, or may cut the filler metal to the predetermined size.

[0021] The control device 50 controls the operation of each part of the welding system 100. The control device 50 has a processing device such as a CPU (Central Processing Unit) and a storage device such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The control device 50 stores data, programs, etc. for controlling the operation of the laser processing device 30 and the filler metal supply device 40.

[0022] Next, an example of a welded product manufacturing method according to this embodiment will be described. Fig. 2 is a flow chart showing an example of the welded product manufacturing method according to this embodiment. Fig. 3 and Fig. 4 are process diagrams showing each process of the welded product manufacturing method according to this embodiment.

[0023] As shown in Fig. 3 (ST1), first, recesses 12, 22 are formed in the butted portions 11, 12 of the first target member 10 and the second target member 20 (S10: recess forming step). In the recess forming step, the recesses 12, 22 are formed so that when the first target member 10 and the second target member 20 to be joined are butted together, a plurality of holes spanning the first target member 10 and the second target member 20 are formed on the boundary line B (see ST2 in Fig. 3, etc.) between the first target member 10 and the second target member 20. The recesses 11, 12 can be formed by machining using, for example, a hole forming device 60 or the like.

[0024] 3 (ST2), the first target member 10 and the second target member 20 are butted together (S20: butting step). In the butting step, the first target member 10 and the second target member 20 are butted together while being aligned so that a plurality of holes H spanning the first target member 10 and the second target member 20 are formed by the recesses 12, 22 formed in the recess forming step.

[0025] In the recess forming step, the recesses 12, 22 can be formed so that the diameter of the hole H is about 5 mm, the depth of the hole H is about 100 mm (i.e., the aspect ratio is about 1:20), and the distance between the holes H is about 10 mm. In this embodiment, since the hole H is a through hole, the depth of the hole H has the same value as the thickness of the first target member 10 and the second target member 20. The dimensions of the hole H are not limited to those described above.

[0026] 3 (ST3), welds 71 ​​are formed in the holes H (S30: first welding step (welding step)). In the first welding step, the welding system 100 places a filler material 72 inside the holes H using the filler material introduction device 40, irradiates the laser L while scanning it using the laser processing device 30 to melt the filler material 72, and fills the holes H with the melted filler material 72.

[0027] 5 and 6 are diagrams showing the structure along the AA cross section in FIG. 3 (ST3). In FIG. 5 and FIG. 6, the aspect ratio of the hole H is shown differently from the actual one in order to make it possible to distinguish the internal structure of the hole H. As shown in FIG. 5 and FIG. 6, in this embodiment, the hole H is a through hole penetrating the first target member 10 and the second target member 20 in the thickness direction. In this case, for example, in a butting process, a backing metal T is placed so as to block the opening of the hole H on the side opposite to the side irradiated with the laser L (for example, the opening on the lower side in the figure). In this state, the filler metal supplying device 40 places the filler metal 72 inside the hole H with the backing metal T as the bottom.

[0028] After the filler material 72 is placed, the laser processing device 30 irradiates the laser L from the laser irradiation device 31 toward the bottom of the hole H. The laser processing device 30 irradiates the surface of the filler material 72 placed inside the hole H with the laser L. The laser scanning device 32 scans the inside of the hole H with the laser L. The laser scanning device 32 scans the irradiation position of the laser L at a speed of 1 m / sec or more using the first galvanometer mirror 33 and the second galvanometer mirror 34. The laser scanning device 32 can suppress the occurrence of spiking in laser welding by setting the gap of the trajectory during scanning, that is, the movement interval of the laser irradiation position, to within 1 mm. In addition, the laser irradiation device 31 and the laser scanning device 32 perform laser irradiation, for example, 300 times in the case of a short pulse laser, while moving the irradiation position in a set pattern.

[0029] The filler material 72 melts due to the irradiation of the laser L. The molten filler material 72 fills the hole H. As shown in FIG. 5, a penetration portion 73 is formed on the inner circumference of the hole H due to the irradiation of the laser L(La). The penetration portion 73 is formed around the filler material 72 filled in the hole H. The penetration portion 73 is formed so that the diameter of the outer circumference is in the range of 6 mm to 7 mm, for example.

[0030] In the first welding process, a plurality of molten filler materials 72 are stacked in the height direction as shown in FIG. 6. That is, in the first welding process, a plurality of melted and solidified filler materials 72 are stacked in the height direction to fill the hole H. The number of stacked filler materials 72 is preferably, for example, 1 or more and 20 or less. Here, the number of stacked filler materials 72 is 1 or more, but it may be multiple stacked. From the viewpoint of efficiency, the fewer the number of stacked filler materials 72, the more preferable. In the first welding process, a welded portion 71 including the filler material 72 and the penetration portion 73 is formed for each hole H. In the first welding process, such a welded portion 71 is formed for each hole H.

[0031] 7 to 9 are explanatory diagrams showing an example of a trajectory along which the laser L is scanned. FIGS. 7 to 9 show the state of the hole H as viewed from the opening side (the side irradiated with the laser L). The trajectory R1 shown in FIG. 7 has a circle on the inner diameter side and a circle on the outer diameter side. The laser scanning device 32 can irradiate the laser at each position on the trajectory R1 by moving the irradiation position as shown by the arrow A1.

[0032] 8 has three circles C1, C2, and C3 with different radii from the inner diameter side to the outer diameter side and the same center. In other words, the locus R2 is a triple circle, and each circle is connected by a connecting line extending in the radial direction.

[0033] The locus R3 shown in Fig. 9 is a locus drawn by moving the center of the circle along the reference circle C4 with a diameter Q1 and drawing a circle with a diameter Q2. The diameter Q1 is larger than the diameter Q2. By drawing a circle while moving the center along the reference circle C4, the filler metal can be melted appropriately.

[0034] By making the laser scanning pattern a multiple circle, the laser scanner 32 can more appropriately adjust the amount of heat required for each part, and can melt the filler material 72 continuously with less heat. This can suppress the occurrence of defects such as undercuts, and can reduce the welding heat affected zone. When the trajectory is a multiple circle, it is preferable to scan the laser in the order from the circle on the inner diameter side to the circle on the outer diameter side. In the above, the laser trajectory is a multiple circle, but this is not limited thereto, and the laser trajectory may be a spiral trajectory.

[0035] The laser trajectory is preferably a trajectory in which the heat input near the outer periphery of the hole, i.e., the boundary between the hole and the filler metal, is greater than that near the center of the hole. In other words, the laser trajectory is preferably a trajectory that scans the area along the wall surface more than the area near the center of the hole. For example, in the case of trajectory R1 in FIG. 7 and trajectory R2 in FIG. 8, it is preferable to increase the number of operations of the trajectory on the outer diameter side. This can prevent poor fusion between the inner periphery of the hole H and the filler metal 72, i.e., the occurrence of welding defects.

[0036] Next, as shown in FIG. 4 (ST4), a new hole H is formed between adjacent holes H on the boundary line B between the first target member 10 and the second target member 20, straddling the first target member 10 and the second target member 20 (S40: hole forming process). In the hole forming process, for example, a hole H having a shape and dimensions similar to the above-mentioned hole H can be formed using a hole forming device 60. Note that in the hole forming process, a hole having a shape and dimensions different from the above-mentioned hole H may be formed. In this embodiment, as shown in FIG. 4 (ST4), the new hole H is formed so as to remove a part of the welded portion 71, but is not limited thereto, and the new hole H may be formed so as not to remove the welded portion 71.

[0037] Next, as shown in FIG. 4 (ST5), a weld 74 is formed inside the new hole H formed by the hole forming process (S50: second welding process (welding process)). In the second welding process, a filler material 75 is placed inside the new hole H, and the filler material 75 is melted by irradiating it with a laser L. In the second welding process, the type of filler material 75 and the irradiation conditions of the laser L can be the same as those in the first welding process. By the second welding process, the filler material 75 melts to fill the hole H, and a penetration portion 76 is formed around the filler material 75. The penetration portion 76 is formed so that the diameter of the outer periphery is in the range of 6 mm to 7 mm, for example.

[0038] In the above hole forming step, by adjusting the distance between hole H where welded portion 71 is formed and newly formed hole H, welded portion 71 and welded portion 74 can be connected in the second welding step to form one weld line 70 along boundary line B. In other words, the range of welded portion 74 to be formed in the second welding step is estimated, and in the hole forming step, a new hole H is formed at the position where welded portion 74 is to be connected to welded portion 71 based on the estimated result.

[0039] In this manner, a welded product W is formed in which the first target member 10 and the second target member 20 are welded via the welds 71, 74. More specifically, the welded product W is configured in such a manner that the first target member 10 and the second target member 20 are welded via a weld line 70. The weld line 70 connects the weld portion 71 (filler material 72 and penetration portion 73) and the weld portion 74 (filler material 75 and penetration portion 76) between adjacent holes H, and is formed along the boundary line B between the first target member 10 and the second target member 20.

[0040] As described above, the method for manufacturing a welded product according to the first embodiment includes a recess forming process for forming recesses 12, 22 in the first target member 10 and the second target member 20, which are to be joined, on the boundary line B between the first target member 10 and the second target member 20 when the first target member 10 and the second target member 20 are butted together; a butting process for butting the first target member 10 and the second target member 20 by aligning the positions of the recesses 12, 22 so that multiple holes H are formed; and a welding process for placing filler metals 72, 75 inside the multiple holes H, irradiating them with a laser L while scanning it to melt the filler metals 72, 75, and filling the holes H with the melted filler metals 72, 75 to form welds 71, 74.

[0041] Therefore, the filler materials 72, 75 are placed in the hole H that spans the first target member 10 and the second target member 20, and are melted by the laser L to fill the hole H, so that the first target member 10 and the second target member 20 can be welded without preparing a groove. This eliminates the need for gap management of the groove, and can suppress the occurrence of misalignment. In addition, since the first target member 10 and the second target member 20 are welded in a butt-to-butt state, when the hole H is welded, the surrounding base material exists as a rigid body, and welding deformation when the filler materials 72, 75 melt can be suppressed.

[0042] In the welded product manufacturing method according to this embodiment, the welding process includes stacking the filler material 72 by repeatedly arranging the filler material 72 and melting the arranged filler material 72. Therefore, even if the hole H is long and narrow and has a high aspect ratio and a small diameter, the inside can be efficiently filled with the filler material 72.

[0043] In the welded product manufacturing method according to this embodiment, the recess forming step forms recesses 12, 22 such that a plurality of holes H are formed at intervals on the boundary line B, and further includes a hole forming step of forming a new hole H spanning the first target member 10 and the second target member 20 between adjacent holes H on the boundary line B after the welding step, and the welding step includes placing a filler material 72 inside the new hole H formed by the hole forming step and irradiating the laser L to melt the filler material 72. Therefore, welding deformation can be suppressed by welding the first target member 10 and the second target member 20 in stages.

[0044] In the welded product manufacturing method according to this embodiment, the welding step includes forming penetration parts 73, 76 on the inner circumference of the hole H in which the filler materials 72, 75 are placed by irradiating with a laser L, and the hole forming step includes forming a new hole H at a position where the weld parts 71, 74 are connected between adjacent holes H in the welding step after the new hole H is formed. Therefore, the weld parts 71, 74 can be connected between adjacent holes H to form a weld line.

[0045] [Second embodiment] Next, a second embodiment of the present disclosure will be described. In the first embodiment, the hole H that forms the welded portion 74 in the second welding step is formed in the hole forming step after the first welding step, but the present disclosure is not limited to this. For example, all holes may be formed in the recess forming step.

[0046] Fig. 10 is a flow chart showing an example of a method for manufacturing a welded product according to the second embodiment. Fig. 11 and Fig. 12 are process diagrams showing each process of the method for manufacturing a welded product according to this embodiment.

[0047] 11 (ST11), first, recesses 12A and 22A are formed in the butted portions 11A and 12A of the first target member 10A and the second target member 20A (S110: recess forming step). In the recess forming step, the recesses 12A and 22A are formed so that when the first target member 10 and the second target member 20 to be joined are butted together, all holes to be used in a later step are formed on the boundary line B. In this embodiment, the recesses 12A and 22A are formed so that the holes are in contact with each other, for example.

[0048] Next, as shown in Fig. 11 (ST12), the first target member 10A and the second target member 20A are butted together (S120: butting step). In the butting step, the first target member 10A and the second target member 20A are butted together while aligning their positions so that a plurality of holes HA are formed by the recesses 12A and 22A formed in the recess forming step. In this embodiment, for example, the holes HA are in contact with each other.

[0049] 11 (ST13), at least one of the holes HA is temporarily filled (S130: temporary filling process). In the temporary filling process, for example, of the multiple holes HA arranged in a row, every other hole in the row direction is filled with a temporary filling material P. The temporary filling material P is made of a material that does not melt when irradiated with a laser L, such as ceramic.

[0050] Next, as shown in FIG. 12 (ST14), a weld 71A is formed inside the hole HA that is not temporarily filled (S140: first welding step (welding step)). In the first welding step, a filler material 72A is placed in the hole HA by the same procedure as in the first embodiment, and a laser L is irradiated to melt the filler material 72 and fill the hole H. A penetration portion 73A is formed around the filler material 72A. In this embodiment, since the temporary filling member P does not melt, the penetration portion 73A is not formed in the portion where the temporary filling member P is placed.

[0051] 12 (ST15), the temporary packing members P are removed from the holes HA in which they were placed (S150: removal step). In the removal step, a hollow hole HA is formed by removing the temporary packing members P. In this embodiment, the holes HA are formed as through holes, for example, which makes it easier to remove the temporary packing members P.

[0052] Next, as shown in FIG. 12 (ST16), a welded portion 74A is formed inside the hole HA from which the temporary packing member P was removed (S160: second welding process (welding process)). In the second welding process, a filler material 75A is placed inside the hole HA from which the temporary packing member P was removed, and a laser L is irradiated to melt the filler material 75A. In the second welding process, the type of filler material 75A and the irradiation conditions of the laser L can be the same as those in the first welding process. By the second welding process, the filler material 75A melts to fill the hole HA, and a penetration portion 76A is formed around the filler material 75A.

[0053] In the recess forming step, by adjusting the distance between adjacent holes HA, it is possible to connect welded portion 71A and welded portion 74A in the second welding step and form one weld line 70A along boundary line BA. In other words, the ranges of welded portions 71A and 74A formed in the first and second welding steps are estimated, and in the recess forming step, recesses 12A and 22A are formed based on the estimated results so that hole HA is formed at the position where welded portions 71A and 73A are connected.

[0054] In this manner, a welded product WA is formed in which the first target member 10A and the second target member 20A are welded together via the welds 71A and 74A. More specifically, the welded product WA is formed in which the first target member 10A and the second target member 20A are welded together via a weld line 70A. The weld line 70A connects the weld line 71A and the weld line 74A between adjacent holes HA, and is formed along a boundary line BA between the first target member 10A and the second target member 20A.

[0055] As described above, the welded product manufacturing method according to the second embodiment further includes, after the butt-jointing step, a temporary filling step of filling at least one of the multiple holes HA with a temporary filling member P, and the welding step includes placing a filler material 72A inside a hole HA among the multiple holes HA in which the temporary filling member P is not placed, and irradiating a laser to melt the filler material 72A. Therefore, since the first target member 10 and the second target member 20 are welded in a butt-jointed state via the temporary filling member P, the temporary filling member P exists as a rigid body, and deformation during welding is suppressed.

[0056] The welded product manufacturing method according to this embodiment further includes, after the welding step, a temporary packing removal step of removing the temporary packing material P from the hole HA in which the temporary packing material P was placed, and the welding step includes forming a welded portion 74A inside the hole HA from which the temporary packing material P was removed. Therefore, by welding the first target member 10A and the second target member 20A in stages, welding deformation can be suppressed.

[0057] In the welded product manufacturing method according to the present embodiment, the recess forming step includes forming recesses 12A, 22A such that holes HA are formed at positions where the welds 71A, 74A are connected between adjacent holes HA in the welding step. Therefore, the welds 71A, 74A can be connected between the adjacent holes HA to form a weld line.

[0058] [Third embodiment] Fig. 13 is a diagram showing an example of a welded product manufacturing method according to the third embodiment. In the example shown in Fig. 13, a first target member 10B and a second target member 20B to be joined are large members formed by a three-dimensional modeling method. The first target member 10B and the second target member 20B each have a thickness of, for example, about 250 mm.

[0059] The first target member 10B is designed, for example, to have a recess 12B on the butting end face 11B, and is formed by a three-dimensional modeling method according to the design. Similarly, the second target member 20B is designed, for example, to have a recess 22B on the butting end face 21B, and is formed by a three-dimensional modeling method according to the design. The positions of the recess 12B and the recess 22B are designed, for example, to form a hole HB when the first target member 10B and the second target member 20B are butted together.

[0060] The first target member 10B and the second target member 20B thus formed are welded together using the weldment manufacturing method described in the first or second embodiment to form a molded object WB. The molded object WB has a configuration in which the first target member 10B and the second target member 20B are welded together via a weld line 70B. In this manner, the large first target member 10B and the large second target member 20B can be welded together easily and quickly.

[0061] Note that Figure 13 shows an example in which the holes are formed using the welded product manufacturing method described in the first embodiment, but this is not limited to this, and recesses corresponding to all holes may be formed in the first target member 10B and the second target member 20B as in the molded object manufacturing method described in the second embodiment.

[0062] [Fourth embodiment] 14 is a diagram showing an example of a method for producing a welded product according to the fourth embodiment. In the fourth embodiment, an example of forming a hole HD at an end of a boundary line BC between a first target member 10C and a second target member 20C and welding the hole HD will be described.

[0063] As shown in Fig. 14, first, in a state where the auxiliary member TC is abutted against the first target member 10C and the second target member 20C from the end side of the boundary line BC, an end hole HC is formed so as to straddle the first target member 10C, the second target member 20C, and the auxiliary member TC (end hole forming process). In this case, an arc-shaped recess 12C is formed in the first target member 10C. In addition, an arc-shaped recess 22C is formed in the second target member 20C, which is vertically symmetrical with respect to the boundary line BC with respect to the recess 12C. In addition, an arc-shaped recess T2C is formed in the auxiliary member TC, which forms a circle together with the recess 12C and the recess 22C.

[0064] Next, a welded portion 77C is formed inside the end hole HC (welding step). In the welding step, similarly to the first and second welding steps described above, a filler material 78C is placed inside the end hole HC, and the filler material 78C is melted by irradiating it with a laser L. As a result, the filler material 78C melts and fills the end hole HC, and a welded portion 79C is formed around the filler material 78C.

[0065] After the weld 77C is formed in the end hole HC, the auxiliary member TC and the portion of the weld 77C formed on the auxiliary member TC side are removed (auxiliary member removal process). In the auxiliary member removal process, the weld 77C is removed along the side surfaces on the end sides of the first target member 10C and the second target member 20C. After removing the auxiliary member TC, the end face of the remaining weld 77C may be polished or the like to flatten the end face. In FIG. 14, an example is described in which the weld 77C is formed at one end of the boundary line BC, but the weld can be formed at the other end side of the boundary line BC in the same manner.

[0066] In this manner, a welded product WC is formed in which the first target member 10C and the second target member 20C are welded via the weld portion 70C. In the welded product WC, the weld portion 70C is formed at the end of the boundary line BC in the first target member 10C and the second target member 20C, so that the first target member 10C and the second target member 20C can be reliably welded.

[0067] The configuration of forming the welded portion at the end is not limited to the example shown in FIG. 14. FIG. 15 is a diagram showing an example of a welded portion WD according to a modified example. In the welded portion WD shown in FIG. 15, the configurations of the welded portion 70D (welded portions 71D, 74D, filler material 78D, and penetration portion 79D) are the same as those of the welded portion 70C (welded portions 71C, 74C, filler material 78C, and penetration portion 79C) of the fourth embodiment. In the welded portion WD shown in FIG. 15, a welded portion 77D having a filler material 78D and a penetration portion 79D is formed from the end face 10Da of the first target member 10D and the end face 20Da of the second target member 20D to the welded portion 71D. In this way, the welded portion 77D may be formed in the depth direction along the boundary line BD from the end face 10Da and the end face 20Da. In this case, a plurality of welded portions 77D can be provided on the boundary line BD2 between the end face 10Da and the end face 20Da. The welded portion 77D may be provided at one location on the boundary line BD2.

[0068] The technical scope of the present invention is not limited to the above embodiment, and appropriate modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the boundary line between the first target member and the second target member is formed in a straight line, but the present invention is not limited to this. FIG. 16 is a diagram showing an example of a welded product manufacturing method according to a modified example. As shown in FIG. 16, the boundary line BE between the first target member 10E and the second target member 20E may be curved. In this case, by optimizing the shape of the curved boundary line BE, it is possible to arbitrarily control welding deformation.

[0069] In the above embodiment, the hole between the first target member and the second target member is circular, but the present invention is not limited thereto. FIG. 17 is a diagram showing an example of a welded product manufacturing method according to a modified example. As shown in FIG. 17, the hole HF between the first target member 10F and the second target member 20F may have other shapes, such as an ellipse. In FIG. 17, the hole HF is elliptical, but the present invention is not limited thereto, and may have a polygonal shape, such as a rectangle or a triangle. By forming an elliptical hole HF on the first target member 10F side and the second target member 20F side as shown in FIG. 17, a wire-shaped filler material 72F can be supplied from the end of the hole HF in the longitudinal direction while scanning the center of the hole HF with the laser L.

[0070] In the above embodiment, the hole between the first target member and the second target member penetrates the first target member and the second target member in the thickness direction, but the present invention is not limited to this. FIG. 18 is a diagram showing an example of a welded product manufacturing method according to a modified example. As shown in FIG. 18, the hole HG between the first target member 10G and the second target member 20G may have a bottom without penetrating the first target member 10G and the second target member 20G in the thickness direction. In this configuration, the laser can be irradiated from the opening side of the hole HG. In this case, the back side welding may be performed so as to melt the bottom of the hole HG.

[0071] 18, the hole HH that spans the first target member 10H and the second target member 20H may have a tapered portion HHa formed on one opening side. In this configuration, the laser can be irradiated from the opening on the opposite side to the side where the tapered portion HHa is formed. The hole HH may also be blocked at the end of the tapered portion HHa on the reduced diameter side. In this case, reverse welding may be performed to melt the portion of the tapered portion HHa that blocks the hole HH.

[0072] 18, the hole HI that straddles the first target member 10I and the second target member 20I may be formed so that the diameter varies stepwise in the depth direction. For example, the hole HI has a configuration in which a first hole portion H1 having a large diameter and a second hole portion H2 having a small diameter are connected in the depth direction. In this way, the hole diameter is not limited to being formed in two steps, but may be formed in three or more steps. Also, the hole diameter may be configured to change gradually.

[0073] Moreover, the weldment W formed in the above embodiment can be repaired. Hereinafter, a weldment repair method according to the present disclosure will be described. FIG. 19 is a diagram showing an example of a weldment repair method according to the present disclosure. Here, a case where repair is performed on the weldment W formed in the first embodiment will be described as an example. Note that the same explanation can be applied to the case where repair is performed on the weldment formed in the other embodiments.

[0074] As shown in Fig. 19, first, a repair hole HJ is formed in one welded portion 71 or 74 (welded portion 74 in Fig. 19) to be repaired in the welded workpiece W. The repair hole HJ can be formed, for example, by using a hole forming device 60, similar to the hole forming process of the first embodiment. Note that the repair hole HJ may also be formed by other means. The repair hole HJ is formed inside the hole H formed in the above embodiment.

[0075] Next, a repair portion (weld repair portion) 80 is formed in the repair hole HJ by welding. In the process of forming the repair portion 80, a filler material is placed in the repair hole HJ, and a laser is irradiated to melt the filler material and fill the hole HJ, for example, by the same procedure as the welding process described in the first embodiment. The repair portion 80, including a penetration portion, is formed around the filler material. This forms a repair weld WJ including the repair portion 80.

[0076] In this way, when repairing welds 71, 74, a repair hole HJ is formed inside hole H used to form welds 71, 74, and repair portion 80 is formed in the same procedure as for welds 71, 74, so that welding deformation when the filler metal melts can be suppressed even when repairing. [Explanation of symbols]

[0077] 11, 12, 12A, 12B, 12C, 22, 22A, 22B, 22C, T2C Recess 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I First target member 10Da,20Da end face 11, 11A, 12, 12A Butt joint 11B, 21B butted end faces 20, 20A, 20B, 20C, 20D, 20E, 20F, 20G, 20H, 20I Second target member 20F 2nd Object 22 Laser processing unit 30 Laser processing equipment 31 Laser irradiation device 32 Laser Scanner 33 First Galvanometer Mirror 34 Second Galvanometer Mirror 40 Filler metal charging device 50 Control device 60 Hole forming device 70,70A,70B Welding line 70C, 71, 71A, 71E, 73A, 74, 74A, 77C, 77D Welded parts 72,72A,72F,75,75A,78C,78D filler metal 73, 73A, 76, 76A, 79C, 79D Welding section 80 Welding Repair Section 100 Welding System B,BA,BC,BD,BE Boundary H,HA,HB,HD,HF,HG,HH,HI Hole HC end hole HHa Tapered section HJ repair hole H1 1st hole H2 2nd hole L Laser R1,R2,R3 trajectory T Bracket TC auxiliary material W,WA,WC,WD Weldings WB Modeled object

Claims

1. forming recesses in the first target member and the second target member that will become a plurality of holes straddling the first target member and the second target member on a boundary line between the first target member and the second target member when the first target member and the second target member are butted against each other; butting the first target member against the second target member by aligning the recesses so that a plurality of the holes are formed; placing a filler metal inside the plurality of holes, irradiating the holes with a laser while scanning the filler metal to melt the filler metal, and filling the holes with the molten filler metal to form welds; A method for manufacturing a weldment comprising:

2. The step of forming the recess includes forming the recess so that a plurality of the holes are formed at intervals on the boundary line, The method further includes forming a new hole between the first target member and the second target member between the adjacent holes on the boundary line after the step of forming the welded portion, The welding step includes forming the weld inside the new hole formed by the hole forming step. The method of manufacturing a weldment according to claim 1.

3. The step of forming the hole includes forming the new hole at a position where the welded portion is connected between adjacent holes in the welding step after forming the new hole. The method of manufacturing a weldment according to claim 2.

4. The method further includes, after the step of butting the first target member against the second target member, filling at least one of the holes with a temporary filling member, The welding step includes placing the filler metal inside a hole in which the temporary filling member is not placed among the plurality of holes, and irradiating the laser to melt the filler metal. The method of manufacturing a weldment according to claim 1.

5. The method further includes removing the temporary filling member from the hole in which the temporary filling member is disposed after the step of forming the welded portion, The step of forming the welded portion includes forming the welded portion inside the hole from which the temporary filling member has been removed. The method for manufacturing a weldment according to claim 4.

6. The step of forming the recess includes forming the recess such that the hole is formed at a position where the welded portions are connected between adjacent holes in the step of forming the welded portions. The method for manufacturing a weldment according to claim 5.

7. The step of forming the welded portion includes a step of stacking the filler metal by repeatedly placing the filler metal and melting the placed filler metal. A method for manufacturing a weldment according to any one of claims 1 to 6.

8. The method further includes a step of forming an end hole so as to straddle the first target member, the second target member, and the auxiliary member while abutting the auxiliary member against the first target member and the second target member from the end side of the boundary line, forming the weld includes forming the weld within the end hole; The method further includes a step of removing the auxiliary member and a portion of the weld formed on the auxiliary member side after the weld is formed in the end hole. A method for manufacturing a weldment according to any one of claims 1 to 7.

9. The hole or end hole has a depth greater than its diameter. A method for manufacturing a weldment according to any one of claims 1 to 8.

10. The hole or the end hole has an aspect ratio, which is the ratio of the diameter to the depth, of approximately 1:

20. A method for manufacturing a weldment according to any one of claims 1 to 9.

11. The first target member and the second target member are formed by a three-dimensional modeling method. A method for manufacturing a weldment according to any one of claims 1 to 10.

12. The step of forming the recess includes forming the recess on the end surfaces of the first target member and the second target member such that the hole is formed in a direction along the boundary line from an end side of the boundary line, The step of forming the weld includes forming the weld within the hole and along the boundary line. A method for manufacturing a weldment according to any one of claims 1 to 11.

13. The first target member and the second target member are formed such that the boundary line is curved. A method for manufacturing a weldment according to any one of claims 1 to 12.

14. The hole or the end hole is elliptical when viewed in the axial direction. A method for manufacturing a weldment according to any one of claims 1 to 13.

15. The hole or the end hole has a bottom in a depth direction. A method for manufacturing a weldment according to any one of claims 1 to 14.

16. The hole or the end hole is formed penetrating in the depth direction, and a tapered portion is formed on one opening side in the depth direction. A method for manufacturing a weldment according to any one of claims 1 to 14.

17. The hole or the end hole is formed so that the diameter varies stepwise in the depth direction. A method for manufacturing a weldment according to any one of claims 1 to 14.

18. A first target member and a second target member; a welded portion that joins the first target member and the second target member; Equipped with the first target member and the second target member are butted against each other such that a plurality of holes are formed on a boundary line between the first target member and the second target member, the holes straddling the first target member and the second target member; The welds are disposed to fill the holes. Welding.

19. The welded portion includes a filler metal that fills the hole, and a penetration portion formed on the inner periphery of the hole in contact with the filler metal in the first target member and the second target member, and is disposed in a state in which at least one of the filler metal and the penetration portion is connected between adjacent holes.

20. The weldment of claim 18.

20. 20. The welded article according to claim 18 or 19, further comprising: forming a repair hole in the weld; placing a filler metal inside the repair hole, irradiating the repair hole with a laser while scanning it to melt the filler metal, and filling the repair hole with the molten filler metal to form a weld repair portion; A method for repairing a weldment comprising the steps of:

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