JP7160764B2 - Laminate-molded article manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a layered product.

In recent years, the need for 3D printers as a means of production has increased, and research and development are being carried out for practical application in the aircraft industry, etc., especially for application to metal materials. A 3D printer using a metal material melts metal powder or metal wire using a heat source such as a laser or an arc, and laminates the molten metal to form a modeled object.

In such a forming technique, the angle at which the welding torch is inclined inward in the width direction increases toward the upper layer, and the weld bead of the remaining layer is formed in the heat-affected zone formed in the weld base metal. It is known that the heat of time is easily applied and the soundness of the weld base material is maintained well (see, for example, Patent Document 1).

In addition, when performing arc welding, considering the measured value of the arc voltage and the degree of wear of the electrode, even if the electrode wears out during long welding, the arc length is automatically corrected by correcting the reference arc voltage, etc. There is a known technique for reducing welding defects such as insufficient penetration and incomplete fusion by keeping it constant (see Patent Literature 2, for example).

Japanese Patent No. 5909097 JP-A-2002-283053

By the way, when a modeled article is manufactured by laminating welding beads, it may be necessary to adjust the amount of penetration in each layer of the welded beads to be laminated depending on the structure of the modeled article to be manufactured.

For example, when a weld bead for hardfacing is laminated on a modeled object to form a hardfacing layer, if the amount of hardfacing melted into the base layer is large, the dilution rate increases, and the required strength may not be obtained. In this case, in order to obtain sufficient strength, an extra welding bead for hardfacing must be provided, which causes inefficient work and increases the manufacturing cost. Further, in the fusion with the underlying layer or the joining of parts, it may be required to deepen the penetration into the underlying layer to increase the degree of bonding.

With the techniques described in Patent Literatures 1 and 2, it is difficult to adjust the amount of penetration as required. For this reason, it is desired to easily adjust the penetration amount and laminate the welding beads to manufacture a modeled object.

The present invention has been made in view of the above matters, and its object is to easily adjust the penetration amount of the welding bead as necessary to manufacture a high-quality laminate-molded article. It is to provide a manufacturing method of

The present invention consists of the following configurations.
A method for manufacturing a laminate-molded article in which welding beads obtained by melting and solidifying a filler material by an arc are laminated,
a first shaping step of forming a weld bead with a first arc length;
a second shaping step of forming a weld bead with a second arc length that is different from the first arc length;
A method of manufacturing an additive manufacturing article.

ADVANTAGE OF THE INVENTION According to this invention, the melt-in amount of a welding bead can be easily adjusted as needed, and a high-quality laminate-molded article can be manufactured.

It is a lineblock diagram of a manufacturing system used for manufacture of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is sectional drawing of the laminate-molded article in the middle of manufacture which shows the manufacturing procedure of a laminate-molded article. It is a sectional view of a laminate-molded article showing an example of a laminate-molded article.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, a manufacturing system to which the method for manufacturing a laminate-molded article of the present invention is applied will be described.
FIG. 1 is a schematic configuration diagram of a manufacturing system to which the method for manufacturing a laminate-molded article of the present invention is applied.

As shown in FIG. 1 , the manufacturing system 100 having this configuration includes a layered manufacturing apparatus 11 and a controller 15 that controls the layered manufacturing apparatus 11 in an integrated manner.

The layered manufacturing apparatus 11 includes a welding robot 19 having a torch 17 on its tip axis, and a filler material supply section 21 that supplies a filler material M to the torch 17 . The torch 17 holds the filler material M in a state of protruding from the tip.

The controller 15 has a CAD/CAM section 31, a trajectory calculation section 33, a storage section 35, and a control section 37 to which these are connected.

The welding robot 19 is an articulated robot, and the torch 17 provided on the tip shaft is supported so that the filler material M can be continuously supplied. The position and posture of the torch 17 can be arbitrarily set three-dimensionally within the range of degrees of freedom of the robot arm.

The torch 17 has a shield nozzle (not shown), and a shield gas is supplied from the shield nozzle. The arc welding method used in this configuration may be a consumable electrode type such as coated arc welding or carbon dioxide gas arc welding, or a non-consumable electrode type such as TIG welding or plasma arc welding. is selected as appropriate.

For example, in the case of the consumable electrode type, a contact tip is arranged inside the shield nozzle, and the contact tip holds the filler material M to which the melting current is supplied. The torch 17 holds the filler material M and generates an arc from the tip of the filler material M in a shield gas atmosphere. The melt material M is fed from the melt material supply unit 21 to the torch 17 by a delivery mechanism (not shown) attached to a robot arm or the like. When the continuously fed filler material M is melted and solidified while the torch 17 is moved, a linear welding bead B, which is a melted and solidified body of the filler material M, is formed on the base material 10. .

The CAD/CAM unit 31 creates the shape data of the laminate-molded article W to be produced, divides it into a plurality of layers, and generates layer shape data representing the shape of each layer. The trajectory calculator 33 obtains the movement trajectory of the torch 17 based on the generated layer shape data. The storage unit 35 stores data such as the generated layer shape data and the movement trajectory of the torch 17 .

The control unit 37 drives the welding robot 19 by executing a drive program based on the layer shape data stored in the storage unit 35 and the movement locus of the torch 17 . That is, the welding robot 19 moves the torch 17 while melting the filler material M with an arc based on the movement trajectory of the torch 17 generated by the trajectory calculation unit 33 according to the command from the controller 15 .

By the way, when manufacturing a laminate-molded article W by stacking the welding beads B, it may be necessary to adjust the amount of penetration in each layer of the weld beads B to be laminated depending on the structure of the laminate-molded article W to be manufactured.

In this embodiment, the welding bead B is laminated by adjusting the arc length in order to adjust the amount of penetration into the lower layer. Hereinafter, a method of manufacturing a laminate-molded article W by adjusting the arc length and laminating the welding beads B will be described.
2A to 2C are cross-sectional views of a laminate-molded article in the process of manufacturing, showing the manufacturing procedure of the laminate-molded article.

(When reducing the amount of penetration)
(1) First molding step As shown in FIG. 2A, a weld bead B1 is formed by melting a filler material M protruding from the tip of the torch 17 with an arc Ac and laminated to form a laminate composed of the weld bead B1. Model W1. At this time, the welding bead B1 is formed by setting the arc length of the arc Ac to the first arc length L1.

(2) Second shaping step As shown in FIG. 2B, the welding bead B2a is formed on the laminate W1 of the welding bead B1 by melting the filler material M protruding from the tip of the torch 17 with the arc Ac. Laminate. At this time, the welding bead B2a is formed as the second arc length L2a longer than the first arc length L1 by increasing the arc voltage of the arc Ac.

In this way, by increasing the arc voltage and forming and laminating the welding bead B2a with the second arc length L2a longer than the first arc length L1, the arc Ac is dispersed at the irradiation point of the arc Ac, and the arc pressure increases. It lowers, and the penetration into the welding bead B1 in the lower layer becomes shallow. That is, it is possible to reduce the amount of penetration of the upper layer welding bead B2a into the lower layer welding bead B1.

(When increasing the penetration amount)
(1) First Forming Step A welding bead B1 is formed and laminated by melting the filler material M protruding from the tip of the torch 17 with an arc Ac to form a laminate W1 composed of the welding bead B1. At this time, the arc length of the arc Ac is set to the first arc length L1 to form the welding bead B1 (see FIG. 2A).

(2) Second molding step As shown in FIG. 2C, the welding bead B2b is formed on the laminate W1 of the welding bead B1 by melting the filler material M protruding from the tip of the torch 17 with the arc Ac. Laminate. At this time, the welding bead B2b is formed by setting the arc length of the arc Ac to a second arc length L2b shorter than the first arc length L1 by lowering the arc voltage.

In this way, by lowering the arc voltage and forming and laminating the welding bead B2b with the second arc length L2b shorter than the first arc length L1, the arc Ac concentrates at the arc Ac irradiation location and the arc pressure increases. It rises and melts into the weld bead B1 in the lower layer deep. That is, it is possible to increase the penetration amount of the upper layer welding bead B2b into the lower layer welding bead B1.

Examples of cases in which it is effective to adjust the arc length as described above include the following.
(When it is effective to lengthen the arc length and shallow the penetration)
(1) Reduction of Dilution Rate of Hard-Covered Layer By reducing the dilution rate, it is possible to suppress a decrease in the strength of the hard-clad layer.
(2) Suppression of Evaporation of Alloy Components Evaporation of easily evaporating alloy components such as zinc (Zn) can be suppressed, and the occurrence of porosity can be suppressed.
(When it is effective to shorten the arc length and deepen the penetration)
(1) Elimination of Welding Defects such as Poor Penetration It is possible to increase the amount of penetration into the lower layer and suppress welding defects such as poor penetration.
(2) Refinement of crystal structure It is possible to refine the crystal structure at the lamination location and increase the strength.

The welding state of the upper layer welding beads B2a and B2b into the lower layer welding bead B1 can be determined by monitoring temperature changes, for example, with an infrared camera.

By the way, as described above, if the welding beads B2a and B2b are laminated by adjusting the arc length, the amount of penetration can be easily adjusted. Then, the shapes of the lower layer welding bead B1 and the upper layer welding beads B2a and B2b become uneven. Specifically, if the arc length is lengthened to shallow the penetration when forming the upper layer welding bead B2a, the width dimension of the welding bead B2a is increased, and the arc length is shortened when forming the upper layer welding bead B2b to increase the penetration. If it is made deeper, the width dimension of the welding bead B2b becomes smaller.

Therefore, in the present embodiment, in order to suppress the increase or decrease in the width dimension of the welding beads B2a and B2b with respect to the welding bead B1 due to the adjustment of the penetration amount, the attitude of the torch 17 is adjusted to stack the welding beads B2a and B2b. . Hereinafter, a method for manufacturing a laminate-molded article W by adjusting the width dimension of the welding beads B2a and B2b and laminating them while adjusting the penetration amount will be described.
3A and 3B are cross-sectional views of the laminate-molded article in the process of manufacturing, showing the manufacturing procedure of the laminate-molded article.

(When reducing the amount of penetration)
(1) First Forming Step A welding bead B1 is formed and laminated by melting the filler material M protruding from the tip of the torch 17 with an arc Ac to form a laminate W1 composed of the welding bead B1. At this time, the arc length of the arc Ac is set to the first arc length L1 to form the welding bead B1 (see FIG. 2A).

(2) Second Forming Step By increasing the arc voltage, a welding bead B2a is formed with a second arc length L2a longer than the first arc length L1 and laminated on the laminate W1 of the welding bead B1. As a result, the arc Ac is dispersed at the arc Ac irradiation location, the arc pressure is lowered, and the penetration into the welding bead B1 of the lower layer is shallowed (see FIG. 2B).

At this time, as shown in FIG. 3A, the welding robot 19 is controlled to adjust the attitude of the torch 17, tilt the torch 17 forward in the welding direction, and give the torch 17 a receding angle θR. As a result, the molten metal is pushed backward at the arc Ac irradiation location, and the width dimension of the welding bead B2a is reduced. Thus, by providing the torch 17 with the receding angle θR, the widening of the welding bead B2a caused by forming the welding bead B2a with the long second arc length L2a can be suppressed. Therefore, the shape of the welding bead B2a of the upper layer can be aligned with the welding bead B1 of the lower layer.

(When increasing the penetration amount)
(1) First Forming Step A welding bead B1 is formed and laminated by melting the filler material M protruding from the tip of the torch 17 with an arc Ac to form a laminate W1 composed of the welding bead B1. At this time, the arc length of the arc Ac is set to the first arc length L1 to form the welding bead B1 (see FIG. 2A).

(2) Second Forming Step By lowering the arc voltage, a welding bead B2b is formed with a second arc length L2b shorter than the first arc length L1 and laminated on the laminate W1 of the welding bead B1. As a result, the arc Ac is concentrated at the irradiated portion of the arc Ac, the arc pressure is increased, and the penetration into the welding bead B1 of the lower layer is deepened (see FIG. 2C).

At this time, as shown in FIG. 3B, the welding robot 19 is controlled to adjust the posture of the torch 17, tilt the torch 17 rearward in the welding direction, and give the torch 17 a forward angle θF. As a result, the molten metal is pushed forward at the arc Ac irradiation location, and the width dimension of the welding bead B2b is increased. Accordingly, by providing the torch 17 with the advancing angle θF, the width of the welding bead B2b caused by forming the welding bead B2b with the short second arc length L2b can be suppressed. Therefore, the shape of the welding bead B2b of the upper layer can be aligned with the welding bead B1 of the lower layer.

The adjustment of the width dimension of the welding bead B is performed based on the trajectory plan of the welding bead B. The trajectory plan is created from the shape data of the laminate-molded article W to be manufactured, and is a plan of the lamination procedure and shape of the welding bead B obtained using the shape data of the laminate-molded article W to be manufactured. The created trajectory plan is stored in the storage unit 35 of the controller 15 of the layered manufacturing apparatus 11 .

Then, the control unit 37 controls the driving of the welding robot 19 and the like based on the trajectory plan stored in the storage unit 35 when manufacturing the laminate-molded article W by laminating the welding beads B, thereby welding the lower layer. When laminating the upper welding beads B2a and B2b on the bead B1, the receding angle .theta.R or the advancing angle .theta.F is adjusted so that the welding beads B2a and B2b have a width defined by the trajectory plan. As a result, it is possible to suppress variation in the shape of the welding beads B2a and B2b with respect to the welding bead B1 while appropriately adjusting the amount of penetration as necessary, so that a high-quality laminate-molded article W can be manufactured.

The method of adjusting the width dimension of the welding bead is not limited to adjusting the posture of the torch 17, and the posture of the laminate W1 with respect to the torch 17 may be adjusted.
4A and 4B are cross-sectional views of the laminate-molded article in the process of manufacturing, showing the manufacturing procedure of the laminate-molded article.

For example, when the width of the welding bead B2a is widened by lengthening the arc length and making the penetration shallower, as shown in FIG. The width of the welding bead B2a may be reduced by performing ascending (uphill) welding in which the welding bead B2a is relatively tilted forward in the welding direction. As a result, the width of the welding bead B2a due to the formation of the welding bead B2a with the long second arc length L2a can be suppressed, and the shape of the upper welding bead B2a can be made uniform with respect to the lower welding bead B1.

Further, when the width of the welding bead B2b is narrowed by shortening the arc length and deepening the penetration, as shown in FIG. downward (downhill) welding may be performed in which the welding bead B2b is relatively tilted rearward in the welding direction to increase the width dimension of the welding bead B2b. As a result, narrowing of the width of the welding bead B2b caused by forming the welding bead B2b with the short second arc length L2b can be suppressed, and the shape of the welding bead B2b of the upper layer can be made uniform with respect to the welding bead B1 of the lower layer.

In this case also, when the upper layer welding beads B2a and B2b are laminated on the lower layer welding bead B1, the control unit 37 controls the lamination to be the lower layer with respect to the torch 17 based on the trajectory plan stored in the storage unit 35. Adjust the tilt angle of the body W1. As a result, it is possible to suppress variation in the shape of the welding beads B2a and B2b with respect to the welding bead B1 while appropriately adjusting the amount of penetration as necessary, so that a high-quality laminate-molded article W can be manufactured.

As described above, according to the present embodiment, the first shaping step of forming the welding bead B1 with the first arc length L1 and the second arc length L2a that is different from the first arc length L1 , L2b to form the welding beads B2a and B2b appropriately, the welding beads can be laminated with an appropriate amount of penetration. As a result, it is possible to manufacture a high-quality laminate-molded article W in which required strength is ensured. In particular, when forming a hardened layer by laminating hardfacing welding beads, it is possible to suppress excessive dilution of the upper layer hardfacing welding bead with respect to the lower layer welding bead. Decrease can be suppressed.

In the above embodiment, the width dimension of the welding beads B2a and B2b is adjusted by applying an advancing angle or a receding angle or by upward welding or downward welding. etc. may be further controlled to adjust the width dimensions of the weld bead B1 and the weld beads B2a and B2b.

In the above embodiment, the welding beads B2a and B2b formed with the second arc lengths L2a and L2b were laminated on the welding bead B1 formed with the first arc length L1, but the welding beads B2a and B2b formed with the second arc lengths L2a and L2b were laminated. A weld bead B1 formed with the first arc length L1 may be laminated on the weld beads B2a and B2b.

Next, an example of the laminate-molded article W manufactured in this example will be described.
FIG. 5 is a cross-sectional view showing the structure of a laminate-molded article.

As shown in FIG. 5, the laminate-molded article W is composed of a first area AR1 and a second area AR2. The second area AR2 is a hardened layer having hardness higher than that of the first area AR1. That is, in this layered product W, the first area AR1 is covered with the second area AR2 made of the cured layer.

Next, the procedure for modeling the laminate-molded article W using the manufacturing system 100 having this configuration will be described.
(trajectory planning process)
After the CAD/CAM unit 31 of the controller 15 creates the shape data of the laminate-molded article W to be manufactured, it divides it into a plurality of layers to generate layer shape data representing the shape of each layer. Based on the generated layer shape data, the trajectory calculation unit 33 obtains a trajectory plan such as a lamination procedure of the welding bead B, the shape of the welding bead B, and the movement trajectory of the torch 17 for forming the laminate-molded article W, Store in the storage unit 35 .

(Laminate manufacturing process)
The control unit 37 executes the drive program based on the trajectory plan stored in the storage unit 35 to drive the welding robot 19 . Thereby, the welding robot 19 moves the torch 17 while melting the filler material M with the arc Ac according to the command from the controller 15 .

(1) First Forming Step A welding bead B1 is formed by melting the filler material M protruding from the tip of the torch 17 by the arc Ac and laminated on the base material 10 to form the first region AR1. At this time, the arc length of the arc Ac is set to the first arc length L1 to form the welding bead B1 (see FIG. 2A).

(2) Second molding process The filler material M protruding from the tip of the torch 17 is changed for hardfacing. The filler material M for hardfacing is increased in hardness by adding additives such as carbon, chromium and molybdenum. Examples of carbide-based additives include chromium carbide, niobium carbide, molybdenum carbide, vanadium carbide, and tungsten carbide.

Then, the welding bead B2a is formed and laminated by melting the hardening filler material M projecting from the tip of the torch 17 by the arc Ac to form the second region AR2. At this time, by increasing the arc voltage, the welding bead B2a is formed as a second arc length L2a longer than the first arc length L1 and laminated on the first region AR1 (see FIG. 2B). At this time, the controller 37 adjusts the posture of the torch 17 so that the welding bead B2a has the shape of the welding bead B2a in the created trajectory plan, tilts the torch 17 forward in the welding direction, and moves the torch 17 forward. is given a receding angle θR (see FIG. 3A). Then, the welding bead B2a made of the filler material M for hardening build-up has a uniform width and a shallower penetration with respect to the welding bead B1 forming the first region AR1, thereby reducing the dilution ratio.

Through the above steps, the laminate-molded article W having the second area AR2 formed of the hardened layer around the first area AR1 is obtained.

According to the method for manufacturing the laminate-molded article W, the welding bead B2a forming the second region AR2, which becomes the hardened layer, is laminated with a shallow penetration amount on the welding bead B1 forming the first region AR1, and the dilution rate is increased. It can be suppressed and the required strength can be sufficiently secured.

Moreover, the manufacturing cost can be reduced as compared with the case of lamination manufacturing using the expensive filler material M for hardfacing.

As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications and applications by combining each configuration of the embodiments with each other, based on the description of the specification and well-known techniques. It is also contemplated by the present invention that it falls within the scope of protection sought.

As described above, this specification discloses the following matters.
(1) A method for manufacturing a laminate-molded product in which welding beads obtained by melting and solidifying a filler material by an arc are laminated,
a first shaping step forming a weld bead by a first arc length;
a second shaping step of forming a weld bead with a second arc length that is different from the first arc length;
A method of manufacturing a laminate-molded article comprising:
According to the method for manufacturing a layered product having the above configuration (1), the first modeling step of forming the weld bead by the first arc length, and the second arc length that is different from the first arc length. By appropriately performing the second shaping step of forming the welding bead and laminating the welding bead, the welding bead can be laminated with an appropriate amount of penetration. Thereby, it is possible to manufacture a laminate-molded article in which required strength is ensured. In particular, when the hardening bead is laminated on the lower layer welding bead to form a hardening layer, excessive dilution of the upper layer hardfacing welding bead with respect to the lower layer welding bead can be suppressed. , the decrease in hardness of the hardened layer can be suppressed.

(2) In the second forming step, the weld bead is formed by the second arc length while tilting the torch for forming the weld bead forward or backward in the welding direction to give a receding angle or an advancing angle (1 ) The method for producing a laminate-molded article according to
According to the method for manufacturing a laminate-molded article having the configuration of (2) above, in the second molding step, by giving a receding angle or an advancing angle to the torch that forms the welding bead, the first arc length and the The width dimension of the welding bead formed by the second arc length can be adjusted and aligned.

(3) The method for manufacturing a laminate-molded article according to (1), wherein in the second forming step, the formation of the weld bead by the second arc length is performed by upward welding or downward welding in which the lower layer is inclined and welded.
According to the method for manufacturing a laminate-molded article having the configuration of (3) above, in the second molding step, the welding bead is formed by upward welding or downward welding, so that the first arc length and the second arc length are different. The width dimension of the welding bead formed by the second arc length can be adjusted and aligned.

(4) further including a trajectory planning step of creating a trajectory plan for the lamination procedure and shape of the welding bead using the shape data of the laminate-molded article;
Lamination according to (2) or (3), wherein in the second forming step, the inclination angle of the torch that forms the welding bead or the inclination angle of the lower layer is adjusted to form the welding bead having a shape determined by the trajectory plan. A method of manufacturing a modeled object.
According to the method for manufacturing a layered product having the above configuration (4), in the second modeling step, the inclination angle of the torch or the inclination angle of the lower layer is adjusted to form a welding bead having a shape determined by the trajectory plan. As a result, it is possible to appropriately adjust the amount of penetration as necessary, suppress variation in the shape of the welding bead, and manufacture a high-quality laminate-molded product.

(5) shaping the first region by the first shaping step;
The method for producing a layered product according to any one of (1) to (4), wherein the second forming step forms a second region outside the first region.
According to the method for manufacturing a laminate-molded article having the configuration of (5) above, the first region that is shaped in the first shaping step and the second region that is shaped outside the first region in the second shaping step blend appropriately. It is possible to manufacture a high-quality laminate-molded article that is integrated in quantity.

(6) In the second molding step, the second region to be a hardened layer is formed by forming a weld bead made of a filler material for hardening with a second arc length longer than the first arc length. The method for producing a laminate-molded article according to (5).
According to the method for manufacturing a laminate-molded article having the configuration of (6) above, the welding bead constituting the second region, which becomes the hardened layer, is laminated with a shallow penetration amount to the welding bead constituting the first region, and the dilution rate is can be suppressed, and the necessary strength can be sufficiently secured.
In addition, the manufacturing cost can be reduced compared to the case of laminate manufacturing using an expensive hardfacing filler material.

Ac Arc AR1 First area AR2 Second area B, B1, B2a, B2b Welding bead L1 First arc length L2a, L2b Second arc length M Filler W Laminated article θR Retraction angle θF Advancement angle

Claims (5)

A method for manufacturing a laminate-molded article in which welding beads obtained by melting and solidifying a filler material by an arc are laminated,
a first shaping step forming a weld bead by a first arc length;
a second shaping step of forming a weld bead with a second arc length that is different from the first arc length;
including
In the second forming step, a welding bead is formed by the second arc length while tilting the torch for forming the welding bead forward or backward in the welding direction to give a receding angle or an advancing angle.
A method for manufacturing a laminate-molded article. 2. The method of manufacturing a laminate-molded article according to claim 1, wherein in the second forming step, formation of the weld bead by the second arc length is performed by upward welding or downward welding in which the lower layer is inclined and welded. Further comprising a trajectory planning step of creating a trajectory plan for the lamination procedure and shape of the welding bead using the shape data of the laminate-molded article,
The lamination according to claim 1 or 2 , wherein in the second forming step, the inclination angle of the torch forming the welding bead or the inclination angle of the lower layer is adjusted to form a welding bead having a shape determined by the trajectory plan. A method of manufacturing a modeled object. Modeling the first region by the first modeling step,
The method for manufacturing a laminate-molded article according to any one of claims 1 to 3 , wherein a second region outside the first region is formed by the second forming step. In the second forming step, forming the second region to be a hardened layer by forming a welding bead made of a filler material for hardening with a second arc length longer than the first arc length. Item 5. A method for manufacturing a laminate-molded article according to Item 4 .

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