Abstract: A weldment manufacturing method includes a recess forming step of forming recesses on a first target member and a second target member, the recesses delineating holes each of which spans across the first target member and the second target member and that are arranged along a boundary between the first target member and the second target member when the first and second target members that are the objects to be welded together are brought into abutment against each other; an abutting step of bringing the first and second target members into abutment against each other by aligning the recesses so that the recesses delineate the respective holes; and a welding step of placing filler material in the respective holes irradiating and scanning the filler material with the laser to cause the filler material to melt so as to fill the holes with the molten filler material.

Abstract: A weldment manufacturing method includes drilling that forms a hole on a workpiece, feeding a filler material to the hole and putting the filler material on a bottom of the hole, and melting the filler material by emitting a laser beam to the hole while scanning with the laser beam, so as to fill the hole with the melted filler material. By repeating the feeding and the melting, a weld repairing portion filling the hole is formed.

Abstract: The present invention accurately detects the state of a radiated light beam. According to the present invention, a calibration unit for a metal 3D printer that radiates a light beam at a powder to mold a built part has: a base part that is attached to a stage that is irradiated with the light beam from the metal 3D printer; and a plurality of attachment parts that are provided to the base part at different locations and have detection devices that detect the light beam attached thereto. The attachment parts are provided at different angles such that the detection directions of the detection devices attached thereto are different.

Abstract: A laser device includes a condensing assembly for condensing laser light output from a laser oscillator and a cover for accommodating the condensing assembly, the cover including protection windows permeable to the laser light on an optical path of the laser light. The protection windows include at least one first protection window having a positive refractive index temperature coefficient and at least one second protection window having a negative refractive index temperature coefficient, the at least one first protection window and the at least one second protection window being arranged along the optical path of the laser light.

Abstract: An additive manufacturing method of manufacturing a product by laminating metal includes: laminating the metal so as to form a half-finished product of the product and a support; and spraying dry ice pellets having a particle shape to the support, after the laminating.

Abstract: A weldment manufacturing method includes drilling that forms a hole on a workpiece, feeding a filler material to the hole and putting the filler material on a bottom of the hole, and melting the filler material by emitting a laser beam to the hole while scanning with the laser beam, so as to fill the hole with the melted filler material. By repeating the feeding and the melting, a weld repairing portion filling the hole is formed.

Abstract: A laser device according to an embodiment includes a condensing assembly condensing laser light output from a laser oscillator and a cover for accommodating the condensing assembly, the cover including protection windows permeable to the laser light on an optical path of the laser light. The protection windows include at least one first protection window having a positive refractive index temperature coefficient and at least one second protection window having a negative refractive index temperature coefficient, the first protection window and the second protection window being arranged along the optical path of the laser light.

Abstract: A method of repairing a ceramic coating according to an embodiment includes forming a second ceramic layer by thermally spraying ceramic spray particles to a repair section of the ceramic coating in which a first ceramic layer is formed, and melting a part of an interface, on a surface side of the ceramic coating, between the first ceramic layer and the second ceramic layer by heating the part.

Abstract: Provided is a method for manufacturing a cylindrical member which includes end bending of respective end portions of a plate material in a longitudinal direction, primary grooving of respective end surfaces of the plate material subjected to end bending, bending of the plate material to a ring shape, secondary grooving of respective end surfaces of the plate material subjected to bending in a ring shape, and joining of respective end surfaces of the plate material. Therefore, it is possible to manufacture a high-quality cylindrical member.

Abstract: An additive manufacturing method of manufacturing a product by laminating metal includes: laminating the metal so as to form a half-finished product of the product and a support; and spraying dry ice pellets having a particle shape to the support, after the laminating.

Abstract: A laser welding method of the present invention is a laser welding method for irradiating with a laser beam a groove portion 6 formed along a circumferential direction by butting axial end portions of cylindrical bodies 5a, 5b together to weld the groove portion, the method comprising: a welding process S2 of irradiating the groove portion 6 with the laser beam over the entire circumference to weld the groove portion; and a strain correction process S4 of irradiating the groove portion 6 with the laser beam over the entire circumference, the laser beam having a heat input amount smaller than a heat input amount per unit area of the laser beam emitted in the welding process S2.

Abstract: A processing apparatus and a processing method with which an object-to-be-cut is processed, and a high-precision superconducting acceleration cavity can be formed. The processing apparatus forming a half cell by processing a hollow workpiece, and is provided with a securing jig, a rotational drive portion rotating the securing jig, and a cutting tool. The securing jig having a plurality of members, when cutting a first portion-to-be-cut of the workpiece, the plurality of members are combined in a first pattern so that the first portion-to-be-cut is exposed, when cutting a second portion-to-be-cut of the workpiece, the plurality of members are combined in a second pattern so that the second portion-to-be-cut is exposed, and the combination of the plurality of members is changed from the first pattern to the second pattern without removing the workpiece.

Abstract: A welding system of cylindrical structures which welds a welding end surface of an upper cylindrical structure and that of a lower one in an axial direction thereof, includes: two or more welding apparatuses opposite to the welding end surfaces and disposed at equal arrangement intervals in the circumferential direction thereof; a moving device configured to rotate the upper and lower cylindrical structures relative to the welding apparatuses in a circumferential direction thereof; and a control device configured to control the welding apparatuses and the moving device. The welding apparatus has a filler metal and a heating source therefor, and melts and fuses the filler metal on the welding end surfaces to weld them, and the control device is configured to continuously rotate the upper and lower cylindrical structures an angle of the arrangement interval by the moving device, while welding the welding end surfaces with the welding apparatuses.

Abstract: Provided is a method for manufacturing a cylindrical member which includes end bending of respective end portions of a plate material in a longitudinal direction, primary grooving of respective end surfaces of the plate material subjected to end bending, bending of the plate material to a ring shape, secondary grooving of respective end surfaces of the plate material subjected to bending in a ring shape, and joining of respective end surfaces of the plate material. Therefore, it is possible to manufacture a high-quality cylindrical member.

Abstract: A distortion correction method includes: a reference surface forming process for fabricating a reference surface as a circumferential surface in an outer circumference of a raw pipe having both axial ends to which fitting members are welded; a connecting member installation process for installing a reference surface of the raw pipe in a roller contact member that rotatably supports the raw pipe; a measurement process for measuring a tilt of the fitting member rotating along with the raw pipe by virtue of the roller contact member with respect to an axial direction of the raw pipe; and a distortion correction process for performing TIG welding for a weld portion between the raw pipe and the fitting member on the basis of a result of the measurement in the measurement process to correct the tilt of the fitting member with respect to the axial direction of the raw pipe.

Abstract: A laser welding method of the present invention is a laser welding method for irradiating with a laser beam a groove portion 6 formed along a circumferential direction by butting axial end portions of cylindrical bodies 5a, 5b together to weld the groove portion, the method comprising: a welding process S2 of irradiating the groove portion 6 with the laser beam over the entire circumference to weld the groove portion; and a strain correction process S4 of irradiating the groove portion 6 with the laser beam over the entire circumference, the laser beam having a heat input amount smaller than a heat input amount per unit area of the laser beam emitted in the welding process S2.

Abstract: A laser cutting apparatus (10) includes a laser processing head (15) that receives a laser beam emitted by a laser oscillator (12) and that uses a spherical lens for converging the laser beam so as to cause the intensity distribution of the laser beam to have a caldera-like shape, in which the intensity of the laser beam is higher in a peripheral area than in a central area, at the position of a workpiece (20). Moreover, the laser processing head (15) radiates the laser beam whose focal position is displaced from the position of the workpiece (20) to the workpiece (20). Therefore, the laser cutting apparatus (10) performs an inversion on the laser beam by using the spherical aberration of the spherical lens. Consequently, with a simple configuration, a laser beam whose inner area and outer area are inverted at the position of the workpiece (2) can be generated, and the processing direction for processing the workpiece (20) is not limited.

Abstract: A welding equipment that forms an end part includes a vacuum chamber; a holding member that is installed in the vacuum chamber and that holds the end part in which a welding groove is formed by placing a half cell, an end plate, and a beam pipe next to each other; a window that is installed in a top-end surface portion of the vacuum chamber, which intersects with an axial center of the end part, and that forms a portion thereof; a laser radiating head that is installed outside the vacuum chamber and that radiates a laser beam into an internal space of the end part through the window; and a mirror member that is installed in the internal space of the end part and that adjusts a reflected laser beam, formed by reflecting the laser beam, so as to be oriented perpendicular to the welding groove.

Abstract: A welding method of welding a cylindrical stiffening member to an outer circumference of a superconducting accelerator tube body uses a laser beam in a process of manufacturing a superconducting accelerator tube. The laser beam is configured such that a distribution profile of energy density on an irradiated face to which the laser beam is irradiated is a Gaussian distribution profile having a peak section, and the energy density of the peak section is 5.8×105 W/cm2 or more.

Abstract: A processing apparatus and a processing method with which an object-to-be-cut is processed, and a high-precision superconducting acceleration cavity can be formed. The processing apparatus forming a half cell by processing a hollow workpiece, and is provided with a securing jig, a rotational drive portion rotating the securing jig, and a cutting tool. The securing jig having a plurality of members, when cutting a first portion-to-be-cut of the workpiece, the plurality of members are combined in a first pattern so that the first portion-to-be-cut is exposed, when cutting a second portion-to-be-cut of the workpiece, the plurality of members are combined in a second pattern so that the second portion-to-be-cut is exposed, and the combination of the plurality of members is changed from the first pattern to the second pattern without removing the workpiece.