An electrode for the projection welding of a weld nut to a workpiece has an electrode welding head with parts including a replaceable welding interface disc fitted therein. The electrode can be disassembled so that the conductive electrode interface within the welding head may be replaced when it becomes worn.

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 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.

To enable a first welding target member including a projection on a welding target portion having short sides and long sides and a second welding target member to be bonded by resistance welding with high welding strength. A manufacturing method for manufacturing a welded article by bonding a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides and a second welding target member by resistance welding, in which the projection portion of the first welding target member is subdivided by forming subdividing grooves extending in the direction of the short sides in the projection portion to reduce the influence of skin effect on the welding current flowing through the subdivided projection portions and improve the uniformity of the current values in the direction of the long sides.

To enable a first welding target member including a projection on a welding target portion having short sides and long sides and a second welding target member to be bonded by resistance welding with high welding strength. A manufacturing method for manufacturing a welded article by bonding a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides and a second welding target member by resistance welding, in which the projection portion of the first welding target member is subdivided by forming subdividing grooves extending in the direction of the short sides in the projection portion to reduce the influence of skin effect on the welding current flowing through the subdivided projection portions and improve the uniformity of the current values in the direction of the long sides.

A shock absorber includes a cylindrically-shaped mounting member having an outer peripheral surface bonded at one end or both ends, the mounting member having an outer diameter at an end surface side smaller than an outer diameter at a center portion, and a reinforcement welding performed at the end surface side of the mounting member at a bonding portion of the mounting member.

A shock absorber includes a cylindrically-shaped mounting member having an outer peripheral surface bonded at one end or both ends, the mounting member having an outer diameter at an end surface side smaller than an outer diameter at a center portion, and a reinforcement welding performed at the end surface side of the mounting member at a bonding portion of the mounting member.

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.

To enable a first welding target member including a projection on a welding target portion having short sides and long sides and a second welding target member to be bonded by resistance welding with high welding strength. A manufacturing method for manufacturing a welded article by bonding a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides and a second welding target member by resistance welding, in which the projection portion of the first welding target member is subdivided by forming subdividing grooves extending in the direction of the short sides in the projection portion to reduce the influence of skin effect on the welding current flowing through the subdivided projection portions and improve the uniformity of the current values in the direction of the long sides.

To enable a first welding target member including a projection on a welding target portion having short sides and long sides and a second welding target member to be bonded by resistance welding with high welding strength. A manufacturing method for manufacturing a welded article by bonding a first welding target member including an elongated projection portion on a welding target portion having short sides and long sides that are longer than the short sides and a second welding target member by resistance welding, in which the projection portion of the first welding target member is subdivided by forming subdividing grooves extending in the direction of the short sides in the projection portion to reduce the influence of skin effect on the welding current flowing through the subdivided projection portions and improve the uniformity of the current values in the direction of the long sides.