Abstract: A metal-resin joining method of joining a metal member to a composite material member including a fiber reinforced plastic composite material includes an applying step of applying a first adhesive that is a thermosetting adhesive to a first region between the metal member and the composite material member, and applying a second adhesive that is a thermosetting adhesive to a second region between the metal member and the composite material member, a provisional bonding step of irradiating a first irradiation region of the metal member opposed to the first region with a laser light, and heating and curing the first adhesive to provisionally bond the metal member and the composite material member together, and a main bonding step of curing the second adhesive after the provisional bonding step to bond the metal member and the composite material member together.

Abstract: A method of forming stiffened plate by welding a plurality of stiffener materials and a steel plate, so that closed cross-sectional structures are secured onto a surface of the steel plate. The stiffener materials are joined to the steel plate as a result of edge portions of the stiffener materials which are in contact with the steel plate by being laser welded at a predetermined welding speed as a result of a laser having a predetermined output being irradiated from a predetermined direction thereon from the external side of the closed cross-sectional structures. Accordingly, it is possible to achieve an improvement in the weld quality when welding stiffener materials onto a steel plate, and to achieve an improvement in fatigue strength.

Abstract: A roller for in-furnace conveyance (1) which is provided with a fitting section (30) in which a fitting hole (11) of a body section (10) and a fitting shaft (24) of a shaft section (20) are fitted, and which constitutes a single roller by welding of the fitting section, wherein the fitting section has a first fitting section (31) in which fitting occurs with a prescribed interstice at a position separated from the weld position, and a second fitting section (32) in which fitting occurs with an interstice larger than that of the first fitting section at a position adjacent to the weld position.

Abstract: A roller for in-furnace conveyance (1) which is provided with a fitting section (30) in which a fitting hole (11) of a body section (10) and a fitting shaft (24) of a shaft section (20) are fitted, and which constitutes a single roller by welding of the fitting section, wherein the fitting section has a first fitting section (31) in which fitting occurs with a prescribed interstice at a position separated from the weld position, and a second fitting section (32) in which fitting occurs with an interstice larger than that of the first fitting section at a position adjacent to the weld position.

Abstract: A method of forming stiffened plate by welding a plurality of stiffener materials and a steel plate, so that closed cross-sectional structures are secured onto a surface of the steel plate. The stiffener materials are joined to the steel plate as a result of edge portions of the stiffener materials which are in contact with the steel plate by being laser welded at a predetermined welding speed as a result of a laser having a predetermined output being irradiated from a predetermined direction thereon from the external side of the closed cross-sectional structures. Accordingly, it is possible to achieve an improvement in the weld quality when welding stiffener materials onto a steel plate, and to achieve an improvement in fatigue strength.

Abstract: An end face (20) of one (10a) of two adjacent thick steel plates (10a, 10b) intended to construct a corner joint of a bridge column is formed into a beveled end face (22). Laser beam welding is applied to a root portion (24) of the beveled end face, and arc welding is applied to bevels (26, 28) thereof so that grooves defined by the bevels (26, 28) are filled with weld metal (40).

Abstract: A stiffened plate is formed by welding a plurality of stiffener materials which, together with a steel plate, form closed cross-sectional structures onto a surface of the steel plate. The stiffener materials are joined to the steel plate as a result of edge portions of the stiffener materials which are in contact with the steel plate by being laser welded at a predetermined welding speed as a result of a laser having a predetermined output being irradiated from a predetermined direction thereon from the external side of the closed cross-sectional structures. Accordingly, it is possible to achieve an improvement in the weld quality when welding stiffener materials onto a steel plate, and to achieve an improvement in fatigue strength.

Abstract: A stiffened plate obtained by welding one or a plurality of stiffening materials (20) onto the surface of a steel plate (10), the stiffened plate in which a single-bevel or single-J groove (24) is formed in an end (22) of the stiffening material, which contacts the steel plate; and a root portion (26) of the single-bevel or single-J groove is subjected to laser beam welding, and a splay portion (28) to arc welding.

Abstract: An end face (20) of one (10a) of two adjacent thick steel plates (10a, 10b) intended to construct a corner joint of a bridge column is formed into a beveled end face (22). Laser beam welding is applied to a root portion (24) of the beveled end face, and arc welding is applied to bevels (26, 28) thereof so that grooves defined by the bevels (26, 28) are filled with weld metal (40).

Abstract: A recess formed in close contact with a thin-walled portion 3a of a workpiece to store molten metal at a surfaced portion, a jig 4 manufactured from a material with a higher heat-resisting temperature than that of the molten metal and a satisfactorily large heat capacity, a step (A) wherein the jig is installed on the workpiece, a preheating step (B) in which the workpiece and the jig are preheated to a predetermined temperature under the condition that jig 4 is installed, a build up welding step (C) for build up welding the thin-walled portion of the workpiece and forming weld beads at surfaced portion, and a jig-removing step (D) for removing the jig after weld beads solidify completely.

Abstract: A recess formed in close contact with a thin-walled portion 3a of a workpiece to store molten metal at a surfaced portion, a jig 4 manufactured from a material with a higher heat-resisting temperature than that of the molten metal and a satisfactorily large heat capacity, a step (A) wherein the jig is installed on the workpiece, a preheating step (B) in which the workpiece and the jig are preheated to a predetermined temperature under the condition that jig 4 is installed, a build up welding step (C) for build up welding the thin-walled portion of the workpiece and forming weld beads at surfaced portion, and a jig-removing step (D) for removing the jig after weld beads solidify completely.