Abstract: A learning device includes: a data acquisition unit configured to acquire information on a welding condition when beads are deposited, a dimension related to a narrow portion forming a valley portion in a surface shape of an additively manufactured object before the beads are deposited, a positional relation between the narrow portion and a target position of the bead, and a defect size of an unwelded defect; and a learning unit configured to generate the estimation model by learning a relation between the welding condition, the dimension related to the narrow portion and the positional relation, and the defect size. The dimension related to the narrow portion includes at least one of a bottom width, an opening width representing an interval between top portions on both sides, both sides, and a valley depth from the top portion to a bottom of the valley portion.

Abstract: A first member provided with a hole, a second member having a tubular shape, and a composite elastic body obtained by combining at least two types of elastic bodies having different hardness are prepared, the second member is inserted into the hole of the first member, the composite elastic body is inserted into the second member, and the composite elastic body is pressed to cause the second member to bulge out, thereby joining the first member and the second member by press-fitting.

Abstract: A method for producing a frame structure contains a hollow member having a curved and long shape, and a plurality of connecting members welded to the hollow member along a longitudinal direction of the hollow member. Each of the connecting members is welded to the hollow member, and a cooling medium is introduced into the inside of the hollow member through an end of the hollow member after the welding. The welding and the introducing are conducted repeatedly in the number of the connecting members.

Abstract: A pulse arc welding profile control method, a control device, a welding system, a welding program, and a welding power supply are provided in which, even when a pulse arc welding method is used, protruding change information is extractable at high accuracy without influence from a welding current or an arc voltage having a pulse shape. An electric change amount detected at the time of weaving includes, as a parameter, at least one among a welding current detection signal and an arc voltage detection signal, takes a predetermined period as one period, calculates an average value of the electric change amount in each one period, and extracts, on the basis of the average value, the protruding change information in a groove to follow a welding line.

Abstract: The present invention relates to a flux-cored wire for positive polarity gas-shielded arc welding use, in which a flux contains a metal powder and also contains BaF2 and SrF2 and AlF3 and/or CaF2 as fluorides wherein the content of BaF2 is 1.0 to 4.5%, the content of SrF2 is 2.0% or less, the content of CaF2 is 0.45% or less and the content of AlF3 is 0.70% or less, at least one of metal elements constituting the flux and the fluorides is a strong deoxidizing metal element having a specified standard formation Gibbs energy, and the content of each of an oxide and a carbonate in the flux is 0.5% or less.

Abstract: A blast furnace operation method according to one aspect of the present invention includes: a process of acquiring a correlation between a carbon consumption in reducing gas and a reduction Input?C in specific carbon consumption caused by blowing the reducing gas into the blast furnace per molar ratio C/H of carbon atoms to hydrogen atoms in the reducing gas; a process of determining a carbon consumption in the reducing gas where the reduction Input?C in specific carbon consumption is a predetermined target value or higher on the basis of the correlation acquired per C/H; and a process of adjusting the amount of the reducing gas blown into the blast furnace on the basis of the determined carbon consumption in the reducing gas and the carbon proportion in the reducing gas.

Abstract: A work measuring method for measuring a work including a columnar member and a diaphragm and held by a positioner includes an acquiring step of acquiring point cloud data on a surface of the work held by the positioner and photographed in a predetermined direction, a detecting step of identifying a portion where distribution of the point cloud data changes in a three-dimensional coordinate system of the positioner and detecting the portion as a boundary position between the columnar member and the diaphragm, and a deriving step of deriving the number of columnar members and diaphragms included in the work on the basis of the boundary position detected in the detecting step.

Abstract: A welding torch includes a torch barrel to which a tip body is attached, and an external cylinder. The torch barrel has outer and inner barrel cylinders. An outer peripheral surface of the inner barrel cylinder is provided with coolant supply and recovery channels. The inner barrel cylinder has an inner-cylinder exposure section. A base end of an outer peripheral surface of the inner-cylinder exposure section is provided with supply and recovery openings. An axial distal end of the inner-cylinder exposure section is provided with a connection section that is connected to the tip body such that the tip body covers an outer periphery of the inner-cylinder exposure section. At least the connection section and the supply and recovery openings are disposed within the external cylinder. A seal section hermetically seals between the external cylinder and the tip body and between the external cylinder and the outer barrel cylinder.

Abstract: A sensor protecting case is provided with a case main body for housing a sensor main body and a sensor input portion, and a centralized cooling portion that is partitioned off by a partition so as to include at least part of the sensor input portion, and constitutes an independent space within the case main body. The case main body has a first gas inflow port for causing gas to flow into the case main body, and a first gas outflow port for causing the gas to flow out of the case main body. The partition has a second gas inflow port that is connected to the first gas inflow port to cause the gas to flow into the centralized cooling portion, and a second gas outflow port for causing the gas to flow out of the centralized cooling part into the case main body.

Abstract: A reward for a decision result of an isostatic pressurization processing condition is calculated based on a state variable including at least one physical quantity related to a workpiece and at least one isostatic pressurization processing condition, a function for deciding at least one isostatic pressurization processing condition from the state variable is updated based on the reward, and updating of the function is repeated to decide an isostatic pressurization processing condition that maximizes the reward. The isostatic pressurization processing condition is at least one of a first parameter related to the workpiece, a second parameter related to a pre-process of the isostatic pressurization processing, and a third parameter related to an operating condition of an isostatic pressurization device, and the at least one physical quantity is at least one of physical quantities related to densification and green compaction of the workpiece.

Abstract: Provided are a method and a device for producing a frame structure, in which influences of both a thermal distortion due to welding and a decrease in the accuracy of the frame member itself are eliminated and high geometrical accuracy is obtained. The method for producing a frame structure includes supporting both ends of a long frame member, temporarily fixing a connecting member to somewhere along a longitudinal direction of the frame member, and final-welding the connecting member to the frame member while keeping the frame member in an elastically deformed state by imposing a bending load on an intermediate portion along the longitudinal direction of the frame member.

Abstract: A semi-hard magnetic steel component including C: 0.60% by mass or more and 1.50% by mass or less, Si: more than 0% by mass and 0.75% by mass or less, Mn: more than 0% by mass and 1.00% by mass or less, P: more than 0% by mass and 0.050% by mass or less, S: more than 0% by mass and 0.050% by mass or less, Cu: more than 0% by mass and 0.30% by mass or less, Ni: more than 0% by mass and 0.30% by mass or less, Mo: more than 0% by mass and less than 0.30% by mass, Cr: 0.85% by mass or more and 2.00% by mass or less, Al: more than 0% by mass and 0.100% by mass or less, and N: more than 0% by mass and 0.0100% by mass or less, the balance being iron and inevitable impurities, wherein 80% by area or more of a tempered martensite phase is included, a half width of an X-ray diffraction peak from a (211) plane is 3.1° or less, an area ratio of carbides is 4.00% or more, and a Vickers hardness is 470 or less.

Abstract: Provided is a concrete reinforcing composite material that is impregnated with a thermoplastic resin having excellent alkali resistance and handleability. In a concrete reinforcing composite material 10, a core material 12 is formed from a fiber bundle of reinforcing fibers. The core material 12 is covered with a coating layer 14 made of a thermoplastic resin. The core material 12 is impregnated with the thermoplastic resin. The thickness of the coating layer 14 is 84 ?m or more. The fiber volume content Vf of the core material 12 is 60% or more.

Abstract: A joining method of a structure includes preparing a first member including a first portion provided with a first hole and a second portion provided with a second hole, a second member, a die, and an elastic member, inserting the second member into the first hole, inserting the elastic member into the second member, in a state where one end of the second member in an axial direction is located between the first portion and the second portion, compressing and expanding the elastic member in the axial direction, thereby expanding and deforming the second member at a portion passing through the first hole to be swaged and joined to the first portion. The die includes a support surface for applying a compressive force from the die to the elastic member through the second hole. The support surface is perpendicular to an axial direction of the elastic member.

Abstract: A relationship between an average current (IP-AVE) of a current non-suppression period (TIP) and an average current (IB-AVE) of a current suppression period (TIB) is set as 0.65?IP-AVE/(IP-AVE+IB-AVE)?0.90, a relationship between any current non-suppression period (TIP) and the current suppression period (TIB) immediately after is set as 0.30?TIB/(TIP+TIB)?0.60, a relationship between a forward feeding period (TP) and a reverse feeding period (TN) is set as 0.40?TN/(TP+TN)?0.70, a relationship between the current non-suppression period (TIP), the current suppression period (TIB), the forward feeding period (TP), and the reverse feeding period (TN) is set as {TN/(TP+TN)}>{TIB/(TIP+TIB)}, and the current non-suppression period (TIP) is controlled to account for ? or more of the forward feeding period (TP).

Abstract: An optical system for a shape measuring device of the present invention includes a parallel light irradiation system and an imaging optical system, in which the parallel light irradiation system includes a point light source, a collimator lens, and a telecentric lens having a both side or object side telecentric structure to be irradiated with light from the collimator lens through an object to be measured, the imaging optical system includes an image sensor onto which an image of a portion of the object to be measured, the image by light passing through the telecentric lens is projected, and the point light source includes an LED, a diffusion member that diffuses and emits light from the LED; and a pinhole member having a pinhole into which light from the diffusion member is incident.

Abstract: A structural member is elongated in a longitudinal direction, and includes a first member made of a steel plate and a second member made of a steel plate, the first member and the second member being joined. In the structural member, a closed cross-sectional shape is formed by the first member and the second member in a cross section perpendicular to the longitudinal direction. The first member has a tensile strength of equal to or greater than 980 MPa, and includes a first hemming process part subjected to hemming bending at both end parts in a width direction orthogonal to the longitudinal direction. The second member has a tensile strength of equal to or greater than 980 MPa, and includes a second bonded part held in the first hemming process part at both end parts in the width direction and bonded to the first hemming process part by an adhesive.

Abstract: This coupling device for a tubular member is provided with: a base stand for holding an inner member and an outer member in a state in which the outer member is disposed around the inner member; a plurality of pressing members that are supported by the base stand in a movable manner in the radial direction of the inner member and the outer member and have a protruding part on the tip thereof; a pressing member that make contact with the final end of the pressing member and that can press the pressing member radially inward; and a drive mechanism that drives any one among the base stand and the pressing member in a direction perpendicular to the movement direction of the pressing member so that the one member moves relative to the other.

Abstract: A gas-shielded arc welding method includes welding a steel plate having a tensile strength of 780 MPa or more while feeding a consumable electrode via a welding torch and flowing a shielding gas. The consumable electrode includes, in mass %, C: 0 to 0.20%, Si: 0 to 0.50%, Mn: 0 to 0.50%, Cr: 1.00% to 9.00%, S: 0.0020% to 0.0600%, and Ni: 0 to 0.50%. The shielding gas includes, in vol. %, at least one of CO2 and O2: 1% to 15% in total, with the remainder being Ar and unavoidable impurities. Welding is performed under the condition satisfying the relationship of 1?{?0.05×[CO2+O2]}+[Cr]?8.3, and [Cr] represents the content of Cr in the consumable electrode, and [CO2+O2] represents a total content of at least one of CO2 and O2 in the shielding gas.

Abstract: An additive manufacturing method is provided for producing a manufactured object by depositing weld beads formed by melting and solidifying a filler metal, the method including repeating the following three steps in the following order: forming a bead layer in which the weld beads are arranged, identifying a region where an impurity is generated on a surface of the formed bead layer, and estimating a thickness of the impurity in the identified region. The method further includes selectively removing the impurity from the surface after the estimating based on the estimated thickness of the impurity.