A welding auxiliary joining part with which a welding connection, more particularly a resistance welding connection, can be established between a first component A made of a poorly weldable material and a second component made of weldable material. The welding auxiliary joining part is distinguished by a cylindrical punch shaft that can be punchingly pressed into the first component A approximately rotation-free. The punch shaft has an element head at the head underside of which only one continuous circumferential clamping ring is arranged that projects axially in the direction of the punch shaft.

A method for welding a stack of sheets having a plurality of sheets of different materials is provided. In an aspect, the stack of sheets includes an aluminum sheet and a galvanneal steel sheet. In an aspect, the method includes resistively spot welding the galvanneal sheet to a hot-stamped steel sheet placed between the aluminum sheet and the galvanneal sheet, the sheet of hot-stamped steel including stress relief sections. The method further includes placing a metal foil on the aluminum sheet and vaporizing the metal foil to project portions of the aluminum sheet through the stress relief sections of the hot-stamped steel sheet to weld the portions of the aluminum sheet to the galvanized steel sheet. In another aspect, the method includes placing the metal foil on a raised portion of the aluminum sheet and projecting the raised portion of the aluminum onto the galvanneal steel sheet.

Provided is a joint component manufacturing method for reducing occurrence of burrs upon bonding between a first member having a hole and a second member having a shaft portion and firmly bonding both members. In the method for manufacturing a joint component 100, a hole-side weak press-fit portion 112 is formed at a hole 111 of a flat plate ring-shaped first member 110. Moreover, each of a shaft-side weak press-fit portion 122 and a shaft-side strong press-fit portion 124 is formed at a shaft portion 121 of a cylindrical second member 120. The hole-side weak press-fit portion 112 and the shaft-side weak press-fit portion 122 are defined by a first weak press-fit interference Lw1 formed thinner than a first strong press-fit interference Ls1. The shaft-side strong press-fit portion 124 is defined by a first strong press-fit interference Ls1 as the minimum necessary press-fit interference for electric resistance welding upon electric resistance welding between the hole 111 and the shaft portion 121.

A welded steel door including a pan having a bottom surface forming a first face of the door and flanges extending on opposite edges thereof forming opposite side edges of the door, the flanges having a lid engaging surface spaced from the bottom surface, a lid having a top surface forming a second face of the door opposite the first face, opposite edges of the top surface each having a hem mated with a respective lid engaging surface of each flange, the hem including a portion of the top surface folded back on itself, and a plurality of welds securing the lid to the pan. The welds extend between the portion of the top surface of the lid folded back on itself of each hem and the respective lid engaging surface of each flange and are thereby concealed.

A method of manufacturing a secondary battery including a negative electrode collector connected to a layered negative electrode core body exposed portion by welding, the method including a first step of disposing a core body connection of the negative electrode collector on an outer surface side of a layered negative electrode core body exposed portion so that a recess in the core body connection opposes the layered negative electrode core body exposed portion, a second step of pressing, with a pressing member, a portion in the core body connection where the recess is formed, forming a deformed portion, and contacting the deformed portion to the layered negative electrode core body exposed portion, and a third step of abutting an electrode for resistance welding against the negative electrode collector and resistance welding the negative electrode collector and the layered negative electrode core body exposed portion to each other.

A method for fusing an electrical conductor to a film pad circuit including the steps of: providing an electrically inert substrate having a first surface and an opposing second surface; applying an electrically conductive film to the second surface of the electrically inert substrate; applying an electrically conductive member to the electrically conductive film; placing an electrical conductor on the first surface of the electrically inert substrate; and fusing the electrical conductor to the conductive member.

After obtaining a rectangular parallelepiped piece in which a first base metal, a weld zone and a second base metal are arranged so as to be aligned in the longitudinal direction from a joint steel member, a portion of the weld zone is cut to provide a slit-shaped notch portion in the piece. A first conductive member is arranged above a surface of the piece that includes an edge on one side of the notch portion in the longitudinal direction, a second conductive member is arranged above a surface of the piece that includes an edge on the other side of the notch portion in the longitudinal direction, and the first and second conductive members are fixed to the piece. A gap between the first conductive member and the second conductive member in the longitudinal direction is set to a predetermined space. The first conductive member and the second conductive member are electrically connected to an external power supply, respectively, and a bending load is applied to the piece in a direction such that the notch portion closes. The bending load is removed once contact between the first conductive member and the second conductive member is electrically ascertained, and thereafter a fatigue precrack is formed at a tip of the notch portion to obtain a CTOD test specimen.

Steel sheet low in cost and improved in fatigue characteristics without causing a drop in the cold formability, characterized in that it comprises an inner layer and a hard layer on one or both surfaces of the inner layer, a thickness of the hard layer is 20 m or more and 40% or less of the thickness of the steel sheet, an average micro-Vickers hardness of the hard layer is 240 HV or more and less than 400 HV, an amount of C of the hard layer is 0.4 mass % or less, an amount of N is 0.02 mass % or less, a variation of hardness measured by a nanoindenter at a depth of 10 from the surface of the hard layer is a standard deviation of 2.0 or less, an average micro-Vickers hardness of the inner layer is 80 HV or more and less than 400 HV, a volume rate of carbides contained in the inner layer is less than 2.00%, and the average micro-Vickers hardness of the hard layer is 1.05 times or more the average micro-Vickers hardness of the inner layer.

A method of attaching a first metal object to a second metal object is presented. The first metal object and the second metal object are dissimilar materials. The first metal object comprises an upper surface and a lower surface. The method comprises: positioning the first metal object in intimate contact with the second metal object such that the second metal object is in contact with the lower surface of the first metal object; identifying at least one attachment location on the upper surface of the first metal object where the first metal object is in intimate contact with the second metal object; adding a powdered metal on the upper surface of the first metal object at the at least one attachment location; and firing a heat source at the powdered metal to melt the powdered metal and drive the melted powdered metal through the first metal object and into the second metal object.

A method of producing a chassis module (1) with a structural component (3) having a through-going aperture (5) into which a ball joint housing (7) is inserted. An outer periphery of the ball joint housing (7) is connected all round to an edge section (9) of the aperture (5) by a first material-cohesive joining (11) without a filler. In order to stabilize the ball joint housing (7) in the aperture (5), the ball joint housing (7) is additionally connected all round to an inner wall section (13) of the aperture (5) at a location spaced away from the edge section (9), by a second material-cohesive joining (15) without a filler. The chassis module (1) is produced by the method, and the chassis module is in the form of a flanged connector (1) or a multi-point link.