Abstract: A nozzle according to one embodiment has an inner surface and an outer surface, and is provided with a first passage through which an energy ray passes, and a second passage that is provided between the inner surface and the outer surface, and through which powder and fluid pass. The second passage includes a second open end on one end thereof in a first direction. A first surface that is one of the inner surface and the outer surface includes a first edge on one end thereof in the first direction. A second surface that is the other one of those includes a second edge on one end thereof in the first direction, and is distanced from the first edge toward the first direction. The fluid ejected from the second open end flows along the second surface, and separates at the second edge.

Abstract: A nozzle according to one embodiment has an inner surface and an outer surface, and is provided with a first passage through which an energy ray passes, and a second passage that is provided between the inner surface and the outer surface, and through which powder and fluid pass. The second passage includes a second open end on one end thereof in a first direction. A first surface that is one of the inner surface and the outer surface includes a first edge on one end thereof in the first direction. A second surface that is the other one of those includes a second edge on one end thereof in the first direction, and is distanced from the first edge toward the first direction. The fluid ejected from the second open end flows along the second surface, and separates at the second edge.

Abstract: A nozzle according to one embodiment has an inner surface and an outer surface, and is provided with a first passage through which an energy ray passes, and a second passage that is provided between the inner surface and the outer surface, and through which powder and fluid pass. The second passage includes a second open end on one end thereof in a first direction. A first surface that is one of the inner surface and the outer surface includes a first edge on one end thereof in the first direction. A second surface that is the other one of those includes a second edge on one end thereof in the first direction, and is distanced from the first edge toward the first direction. The fluid ejected from the second open end flows along the second surface, and separates at the second edge.

Abstract: A nozzle according to one embodiment includes a nozzle unit and a guide surface. A first passage, a second passage, and the guide surface are provided to the nozzle unit. The first passage has a first open end. The second passage has a second open end, and a section that is positioned upstream of the second open end and that extends in a second direction. The guide surface has an edge in a first direction. The guide surface is exposed on the outer side at the edge, is along a third direction at the edge, the third direction being a direction becoming more distanced from an axis than the second direction does, as the third direction is extended further toward the first direction. A flow of fluid ejected from the second open end follows the guide surface, and becomes separated from the nozzle unit at the edge.

Abstract: According to an embodiment, a welding method comprises pretreatment of melting a part of the first member formed by die casting and solidifying the part of the first member. The method may comprise welding the first member and the second member by melting the solidified part of the first member and the second member in contact with each other.

Abstract: According to an embodiment, a nozzle of an additive manufacturing device includes a first inner surface that defines a first path through which an energy ray passes; and a second inner surface that defines a second path that extends along the first path and through which gas and a powder material pass. The first path opens to a leading end of the nozzle. The second path opens to near or around the first path. At least part of the second inner surface includes a first region having a larger friction coefficient for the powder material than the friction coefficient of at least one of the first inner surface and an outer peripheral surface of the leading end.

Abstract: A nozzle according to one embodiment has an inner surface and an outer surface, and is provided with a first passage through which an energy ray passes, and a second passage that is provided between the inner surface and the outer surface, and through which powder and fluid pass. The second passage includes a second open end on one end thereof in a first direction. A first surface that is one of the inner surface and the outer surface includes a first edge on one end thereof in the first direction. A second surface that is the other one of those includes a second edge on one end thereof in the first direction, and is distanced from the first edge toward the first direction. The fluid ejected from the second open end flows along the second surface, and separates at the second edge.

Abstract: A nozzle according to one embodiment includes a nozzle unit and a guide surface. A first passage, a second passage, and the guide surface are provided to the nozzle unit. The first passage has a first open end. The second passage has a second open end, and a section that is positioned upstream of the second open end and that extends in a second direction. The guide surface has an edge in a first direction. The guide surface is exposed on the outer side at the edge, is along a third direction at the edge, the third direction being a direction becoming more distanced from an axis than the second direction does, as the third direction is extended further toward the first direction. A flow of fluid ejected from the second open end follows the guide surface, and becomes separated from the nozzle unit at the edge.

Abstract: Ejection and stop of a powder flow are switched while maintaining a once generated steady flow without stopping it. A processing nozzle includes a supply source of a fluid containing a powder, a first channel through which the fluid supplied from the supply source passes, a second channel that supplies the fluid to an ejection port of the nozzle, a third channel that releases the fluid outside the nozzle, and a switch that causes the first channel and the second channel to communicate with each other when supplying the fluid to the ejection port, and causes the first channel and the third channel to communicate with each other when not supplying the fluid to the ejection port.

Abstract: According to an embodiment, an additive manufacturing apparatus includes a first irradiation unit, and a first emission device. The first irradiation unit is configured to irradiate a material with first light to melt or sinter the material. The first emission device includes a first light source configured to emit the first light, is configured to cause the first light emitted from the first light source to enter the first irradiation unit, and is capable of changing a wavelength of the first light entering the first irradiation unit.

Abstract: Ejection and stop of a powder flow are switched while maintaining a once generated steady flow without stopping it. A processing nozzle includes a supply source of a fluid containing a powder, a first channel through which the fluid supplied from the supply source passes, a second channel that supplies the fluid to an ejection port of the nozzle, a third channel that releases the fluid outside the nozzle, and a switch that causes the first channel and the second channel to communicate with each other when supplying the fluid to the ejection port, and causes the first channel and the third channel to communicate with each other when not supplying the fluid to the ejection port.