Abstract: A multi-pass welding method is provided for minimizing bead sagging and forming a welded joint having a good weld metal surface, even during multi-pass welding in a horizontal orientation, and a multi-pass butt welded joint and a lamination pattern calculation method for a multi-pass weld formed by the method. The weld metal has a plurality of layers from the rear surface of a base material to the front surface thereof. The plurality of layers include a finishing layer having at least two layers including an end layer; and a ground layer for forming the finishing layer. A boundary layer, which is the layer of the ground layer adjacent to the finishing layer, is formed such that the position of an upper plate-side weld is closer to the front surface of the base material than the position of a lower plate-side weld.

Abstract: A method for producing pig iron using a blast furnace comprising a tuyere, the method including: charging a first layer containing an iron ore material and a second layer containing coke alternately in the blast furnace; and reducing and melting the iron ore material in the stacked first layer while injecting an auxiliary reductant into the blast furnace by hot air blown from the tuyere, in which: the iron ore material contains a plurality of reduced iron molded products obtained by compression molding reduced iron; the reduced iron molded product is in a rectangular shape chamfered in a plan view, having on both faces a bulge resulting from a center portion being thicker than a peripheral portion; and a length ratio of a longer side to a shorter side of the reduced iron molded product in the plan view is less than or equal to 1.5.

Abstract: A microchannel heat exchanger is a heat exchanger for cooling hydrogen gas with a cooling medium, and includes a cooling side layer formed with a plurality of medium flow paths for flowing the cooling medium, and a high temperature side layer formed with a plurality of hydrogen flow paths for flowing the hydrogen gas and a first introduction port for flowing the hydrogen gas into the plurality of hydrogen flow paths. The first introduction port has a circular shape or an elliptical shape. An inflow end of each of the plurality of hydrogen flow paths is connected to a peripheral surface of the first introduction port. The hydrogen flow path extends from the first introduction port to the first lead out port without branching.

Abstract: A high-strength hot-dip galvannealed steel sheet may include a plating layer on a surface of a base steel sheet. The base steel sheet may satisfy a predetermined chemical composition, in a metallographic structure of the base steel sheet, wherein a volume ratio of martensite (including tempered martensite and self-tempered martensite) is 82 vol % or more, a volume ratio of ferrite, pearlite and bainite is 13 vol % or less in total, and volume ratio of retained austenite is 5 vol % or less, in an image obtained by observing the metallographic structure of the base steel sheet with a scanning electron microscope, the number of laths at a total length of 300 ?m, the number being measured by an intercept method is 200 or more, a yield strength is 970 MPa or more, and a tensile strength is 1,470 MPa or more.

Abstract: A method for manufacturing an additively manufactured article, the method comprising subjecting a powder material comprising a first powder containing a precipitation hardening stainless steel and a second powder containing titanium carbide to weaving irradiation with a laser beam to melt and solidify the powder material, thereby laminating at least one hardened clad layer on a base material. In the step for laminating the clad layer, the following requirements are satisfied: 20?A?35, 1.1?B?1.3, and (40% by mass)?R2?(65% by mass). In the formulae, A represents a laser heat input index, B represents a powder feeding rate index, and R2 represents a content ratio of the second powder in the powder material.

Abstract: A suction apparatus is provided with: a first path connecting an inlet and a drive opening of an ejector; a second path connecting a suction/ejection opening and an intake opening of the ejector; and a third path connecting the inlet and the suction/ejection opening. When the second path is connected by a path switching unit, a gas or an aerosol is suctioned via the suction/ejection opening by means of the first path and the second path. When the third path is connected by the path switching unit, a compressed gas is ejected via the suction/ejection opening by means of the third path.

Abstract: A method for manufacturing a hot-dip galvanized steel sheet having a high Si content and good plating adhesion. The method for manufacturing a hot-dip galvanized steel sheet includes the following: hot-rolling a steel raw material having a Si content of 1.0 mass % or more and coiling a steel sheet at 500° C. to 700° C.; subjecting a surface of the steel sheet after the coiling to an oxidation treatment at a heating temperature of a steel sheet temperature of 750° C. or lower, and subsequently subjecting the surface to a reduction treatment; and subjecting the steel sheet after the reduction treatment to a hot-dip galvanizing treatment to form a Zn-plated layer on a surface of the steel sheet.

Abstract: A deposition planning method for an additively manufactured object includes: acquiring shape data; determining a welding path of each layer by slicing a three-dimensional shape of the additively manufactured object into layers; classifying a plurality of welding paths into intersection region paths and constant region paths; dividing the intersection region paths into a lower layer path and an upper layer path of an intersection portion; and determining welding conditions of the intersection region paths such that an upper layer deposit amount is more than a lower layer deposit amount, a sum of the upper layer deposit amount and the lower layer deposit amount is equal to a deposit amount in the constant region paths, and in a cross-section orthogonal to a longitudinal direction of the weld beads formed along the upper layer path, profiles of the weld beads adjacent to each other overlap each other.

Abstract: In a suspended industrial robot, a base and a swivel section have an internal space into which a cable can be inserted. The base has an insertion opening through which at least the cable can be passed into the internal space from the outside. A first cable holding part that holds the cable is installed on at least one of a first arm and a second arm. The cable passes through the internal space of the base and the swivel section and is routed up to an end effector with a midway portion of the cable being held by the first cable holding part.

Abstract: Provided are a nitriding apparatus and a method of nitriding, which are capable of suppressing generation of a compound layer by accurately measuring temperature of an object to be treated by nitriding. A nitriding apparatus includes a chamber, a gas supplying unit, a support, a plasma source, a heater, a thermocouple wire including a temperature measuring section, an accommodating member, a power supply for an object to be treated, and a treatment condition control unit. The accommodating member internally accommodates the thermocouple wire to cover the temperature measuring section, while being insulated from the thermocouple wire. The power supply for an object to be treated applies a predetermined voltage to an object to be treated and the housing member so that the object to be treated and the accommodating member are set to an identical potential on the negative side.

Abstract: A welding device including a welding torch; a movable portion; a measurement unit that is provided in the movable portion and is capable of measuring a temperature of the one weld bead and/or the object to be welded in the vicinity of the one weld bead at a predetermined period; a cover portion capable of covering the measurement unit at least; and a driving unit configured to drive a support member supporting the cover portion to move the support member in a predetermined direction to bring the cover portion into a state of covering the measurement unit when the weld bead is formed, and drive the support member to move the support member in a direction opposite to the predetermined direction to bring the cover portion into a state of exposing the measurement unit in the predetermined period.

Abstract: A method for manufacturing a steel sheet for cold rolling, including hot-rolling a slab so that an outlet temperature of a finishing rolling mill is 800° C. or higher and 940° C. or lower, cooling at least a portion of the hot-rolled steel sheet, at a water volume density of 100 L/min/m2 or more for 0.1 seconds or more, within 3.0 seconds after passing through a final stand of the finishing rolling mill and being sent out on a run-out table, and coiling, at a coiling temperature of 550° C. or higher, the cooled hot-rolled steel sheet.

Abstract: A vehicle structural member 1 includes a tube body having an expanded tube portion that is partially expanded, and a wall surface body having a first wall provided with a first through-hole, a second wall provided with a second through-hole, and a connecting wall connecting the first wall and the second wall. The tube body is inserted through the first through-hole and the second through-hole, and is joined to the wall surface body by being pressure welded to the first through-hole and the second through-hole. The expanded tube portion is provided only between the first wall and the second wall.

Abstract: A seat back frame for automobile includes a first side frame and a second side frame that are arranged apart from each other in a vehicle width direction, an upper frame that connects an upper end portion of the first side frame and an upper end portion of the second side frame, and an upper bracket that is attached to the upper end portion of the first side frame and guides a seat belt. The first side frame is an extruded material extending in a vehicle vertical direction, and has a fixed lower end portion. The first side frame has a closed cross-section portion in a cross-section perpendicular to the vehicle vertical direction. The upper end portion of the first side frame is crushed rearward of a vehicle, and a thickness of the upper end portion in a vehicle front-rear direction is smaller than that of the lower end portion.

Abstract: A welding system includes: a welding robot having a movable portion that can move integrally with a welding torch; a control device that controls movement of the welding robot; and a temperature sensor that is attached to the movable portion and measures an interpass temperature of an object to be welded present on a measurement axis in a noncontact manner. A central axis of the welding torch and the measurement axis of the temperature sensor are in a relation of three-dimensionally intersecting in a space, and a position where the central axis and the measurement axis three-dimensionally intersect is ahead of a tip end of the welding torch on the central axis of the welding torch. The control device controls movement of the welding torch such that the measurement axis is positioned at a measurement position of the temperature calculated in advance.

Abstract: A rolling bearing abnormality detection device of the present invention detects a vibration generated in a rolling bearing as vibration data, obtains a frequency spectrum thereof, identifies a frequency indicating a peak as a peak frequency from the frequency spectrum within a predetermined frequency range including a theoretical frequency that brings about a peak on the frequency spectrum during occurrence of an abnormality, sets the peak frequency as a monitoring peak frequency of a monitoring target in a case where the peak frequency changes with time, and determines whether an abnormality is present, based on a peak value of a peak corresponding to the monitoring peak frequency.

Abstract: An excess metal amount setting method includes: a thermal shrinkage prediction step of predicting a thermal shrinkage amount in the deposited body after manufacturing; a thermal shrinkage modifying step of obtaining a thermal deformation modifying profile by expanding a target profile according to the thermal shrinkage amount; a release strain prediction step of predicting an elastic deformation amount due to release strain of the deposited body after machining; an elastic deformation modifying step of obtaining an elastic deformation modifying profile by deforming the thermal deformation modifying profile according to the elastic deformation amount in a direction opposite to a deformation direction due to the release strain; and an excess metal amount setting step of adjusting an outer edge shape of the deposited body so that an excess metal amount from the elastic deformation modifying profile to an outer edge of the deposited body falls within a predetermined reference range.

Abstract: A liquid separation constituent is used by covering a first element portion having a fiber layer for separating liquid from gas discharged from a compressor, and includes a second element portion, a holding portion, and a non-element portion. The second element portion is a tubular portion having a fiber layer that is disposed on the outer side in the radial direction so as to surround the first element portion when the second element portion covers the first element portion and further separates liquid from gas separated by the first element portion. The holding portion is a portion that holds the second element portion such that a gap is formed between the first element portion and the second element portion in the radial direction. The non-element portion is a portion configured to suppress liquid seeping out from a lower portion of the first element portion from scattering to the second element portion.

Abstract: A liquid separation constituent is used with being attached to a top plate to and from which a first element portion is attachable and detachable, and includes a second element portion having a fiber layer, an annular first attachment portion to which an upper end portion of the second element portion is attached, and a second attachment portion to which a lower end portion of a second element portion is attached. The first element portion includes an abutting portion abutting on the top plate and an insertion portion inserted into a through hole of the top plate. The first attachment portion includes a hole portion into which the insertion portion of the first element portion removed from the top plate is insertable, and an annular abutting portion abutting on a lower surface of the top plate from which the first element portion is removed.

Abstract: A method for manufacturing a press-molded article includes: preparing a patchwork blank in which a thickened portion is formed by welding patchwork to basework; bending only the thickened portion of the patchwork blank; and bending a portion other than the thickened portion in a step different from bending of the thickened portion.