Abstract: The arc spot welding method for joining dissimilar materials, in which a first sheet (10) made of an Al-based material or an Mg-based material and a second sheet (20) made of ultra-high tensile steel having a tensile strength of 1180 MPa or more are joined, includes a step of forming a hole in the first sheet (10), a step of overlapping the first sheet (10) and the second sheet (20), a step of inserting a joining auxiliary member (30) made of steel, in which a hollow portion is formed, into the hole of the first sheet (10), and a step of joining the first sheet (10) and the second sheet (20) via the joining auxiliary member (30) using a welding material containing 13 mass % or more of Ni.

Abstract: A steel sheet may be used for hot-dip galvanizing capable of manufacturing hot-dip galvannealed steel sheet(s) with a high Si content and in which alloying unevenness is suppressed. Such a steel sheet for hot-dip galvanizing may include an internal oxide layer containing an oxide of Si between a surface layer of the steel sheet and a steel sheet base portion. The Si content in a chemical composition of the steel sheet may be 1.0 mass % or more. A solid solution Si amount from a surface of the steel sheet to a depth of 1 ?m measured at all four positions including positions of 10 mm, 30 mm, and 50 mm from an edge in a coil width direction and a position of a center in the coil width direction at a rear end in a rolling direction of the steel sheet for hot-dip galvanizing may be 1.4 wt. % or less.

Abstract: The battery case includes a frame body having a rectangular frame shape and a support plate provided at a lower portion of the frame body and supporting the battery. Each of the pair of side frames includes a base portion constituting an inner peripheral surface of the frame body and an inner protruding portion protruding inward in the vehicle width direction from a lower end of the base portion, and the support plate is supported on the inner protruding portion. The battery case includes a refrigerant passage including an in-frame passage which is provided in the inner protruding portion, and is disposed on an inner side in the vehicle width direction with respect to the inner peripheral surface of the base portion and below the support plate.

Abstract: A structure includes: a first member made of metal having a tubular shape, and having a through-insertion hole; a second member made of resin and joined to the first member; and a third member made of metal having a tubular shape, and inserted through inside the first member. The third member is tube-expanded toward the first member and joined to the first member by press-fitting.

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: A TiAl alloy material containing: Al: 42.0 atomic % or more and 44.0 atomic % or less; Cu: 0.5 atomic % or more and 2.5 atomic % or less; and Nb: 3.0 atomic % or more and 7.0 atomic % or less, with the balance being Ti and unavoidable impurities, and lamellar grains have an average grain size of 20 ?m or more and 200 ?m or less.

Abstract: A deformation prediction method for an additively manufactured object includes steps of dividing a shape of the additively manufactured object into a plurality of blocks, calculating deformation amount and deformation direction of each block before and after forming a weld bead by parallel processing of a plurality of threads based on the inherent strain method, setting at least one block group composed of blocks to be joined together among the plurality of blocks, and calculating deformation of an entirety of the block group by adding the deformation amount of each block composing the block group according to the deformation direction of the block.

Abstract: A door beam includes an outer flange, an inner flange, and a pair of webs connecting the outer flange and the inner flange. The outer flange, the inner flange, and the pair of webs define a closed cross-sectional portion. The outer flange includes an outer central portion constituting the closed cross-sectional portion, and outer protruding portions protruding outward from the closed cross-sectional portion. The inner flange is formed with an attachment press working portion having been subjected to press working so as to serve as an attachment portion with respect to the inner panel at both end portions in the longitudinal direction. The outer protruding portion is formed with a mastic press working portion having been subjected to press working so as to serve as an attachment portion with respect to the outer panel.

Abstract: A shape sensor is provided for acquiring a shape profile along an extension direction of an existing weld bead, and a control unit includes a welding information acquisition unit for acquiring welding information during formation of an adjacent weld bead when forming the adjacent weld bead at a position adjacent to the existing weld bead, and a defect candidate extraction unit for determining an angle characteristic portion having a base angle equal to or greater than a threshold in the existing weld bead based on the shape profile, determining a welding characteristic portion of the welding information based on the welding information, and extracting the welding characteristic portion corresponding to the angle characteristic portion as a defect candidate by associating the welding characteristic portion with the angle characteristic portion.

Abstract: A spring constant correction device and method measure a position and attitude of a distal end of an articulated robot when the articulated robot is operated in a state where elastic deformation is compensated, compare measurement values of the position and attitude of the distal end and target values of the position and attitude, and correct a spring constant based on a result of the comparison. In case of the correction, the spring constant is corrected at a predetermined position based on at least three of: an angle of an end point attitude based on the measured attitude; a torque of the distal end in the end point attitude; an angle of the distal end in a target attitude; and a torque of the distal end in the target attitude. A program of such a method is recorded in a recording medium.

Abstract: A fiber-reinforced resin strand used as a manufacturing material for a 3D printer, the fiber-reinforced resin strand containing: a base material containing a thermoplastic resin; and at least one fiber or fiber bundle disposed in the base material and extending in a strand-axial direction. Twisting is applied to the fiber or the fiber bundle along the strand-axial direction, and the number of times of the twisting per 1 m in length of the fiber-reinforced resin strand in the strand-axial direction is 30 or more and 80 or less.

Abstract: In a building step, a base measurement processing of acquiring a measured height by measuring, using a shape sensor, a height of a base at a position where a torch is to be moved when depositing weld beads; a welding condition setting processing of obtaining a planned height of the base at the position where the torch is to be moved from a deposition plan, comparing the measured height acquired in the base measurement processing and the planned height to obtain a differential height, and setting a welding condition in a feedback correction for reducing the differential height; and a correction ratio update processing of performing a selection from a plurality of correction ratios set in advance and updating a correction ratio in the welding condition based on a selected correction ratio are executed.

Abstract: A TiAl alloy may be suitable for forging and may be used to produce a TiAl alloy material having excellent oxidation resistance, high-temperature creep strength, excellent hot forgeability, and can be subjected to die forging. The TiAl alloy may contain, in atomic percentage: Ti; Al in a range of from 42.0 to 43.6%; Cu in a range of from 0.5 to 2.0%; and Nb in a range of from 3.0 to 7.0%; and unavoidable impurities.

Abstract: A method for checking quality of a heat exchanger includes the steps of: performing a liquid pressure test for the heat exchanger including a first flow path and a second flow path adjacent to the first flow path by filling the first flow path and the second flow path with a liquid in a pressurized state; discharging the liquid from the first flow path and the second flow path; and promoting evaporation of the liquid remaining in the first flow path and the second flow path by reducing pressure inside each of the first flow path and the second flow path using a vacuum pump. The step of promoting evaporation of the liquid is performed to feed heated gas into the first flow path and the second flow path.

Abstract: A method for manufacturing a metal-resin composite includes preparing a mold including a first mold forming a housing portion and a second mold movable with respect to the first mold, housing an extruded material in the housing portion, arranging resin material on the first mold, moving the second mold to form a cavity defined by the extruded material and the mold, and filling the cavity with the resin material. In the filling, a protrusion of the extruded material is brought into close contact with the housing portion or its peripheral edge by molding pressure applied from the mold to the extruded material, and the cavity is disconnected from a gap between an inner surface of the housing portion and the extruded material.

Abstract: A side sill reinforcement structure includes a battery unit for drive, a side sill extending in a vehicle front-rear direction on an outer side in a vehicle width direction of the battery unit, and a reinforcing member that connects the battery unit and the side sill. The reinforcing member includes a closed cross-sectional portion group having a first closed cross-sectional portion disposed on the innermost side in the vehicle width direction and a second closed cross-sectional portion disposed adjacent to the first closed cross-sectional portion. The first closed cross-sectional portion includes a first upper wall and a first lower wall. The second closed cross-sectional portion includes a second upper wall and a second lower wall. The thickness of the first upper wall is larger than the thickness of the second upper wall, and the thickness of the first lower wall is larger than the thickness of the second lower wall.

Abstract: An additive manufacturing method includes dividing a three-dimensional model shape into a plurality of layers, and dividing each divided layer into a plurality of bead models. A trapezoidal bead model has four vertices. The dividing into the plurality of bead models includes, in the same layer, the bead model for a previously formed weld bead and the bead model for a subsequently formed weld bead that is adjacent to the previously formed weld bead are arranged to have an overlapping portion, and among four vertices of the bead model for the subsequently formed weld bead, selecting as a selected vertex the vertex positioned at an end of the bottom line of the bead model, the end being away from the overlapping portion, and rotating the other three vertices about the selected vertex to change a shape of the trapezoidal bead model.

Abstract: A target shape is set from a three-dimensional shape data of an additively-manufactured object, and the set target shape is sliced into a plurality of bead models having shapes corresponding to weld beads. A dripping amount of a filler metal to a lower layer during bead formation in a bead deposition portion where the sliced bead models overlap vertically is predicted according to welding conditions of the weld beads. A bead height of each bead model in the bead deposition portion is modified according to the predicted dripping amount. A deposition plan to manufacture the additively-manufactured object is created by using the plurality of bead models including the bead model with modified bead height.

Abstract: A flux-cored wire with a steel sheath filled with flux, including based on a total mass of the wire, C: 0.026% to 0.060% by mass, Si: more than 0% to 0.50% by mass, Mn: 1.3% to 2.8% by mass, Cu: 0.20% to 1.50% by mass, Ni: 0.45% to 1.00% by mass, Mo: 0.15% to 0.65% by mass, Mg: 0.30% to 0.65% by mass, and B: 0.001% to 0.010% by mass. Provided that Cr: 0.10% by mass or less and Al: 0.10% by mass or less. A Nb content [Nb] of the wire expressed in % by mass based on the total mass of the wire and a V content [V] of the wire expressed in % by mass based on the total mass of the wire satisfy [Nb]+[V]=0.015 or less.