A welding apparatus includes a rotary table (13) configured to support a support body (12) extending in a vertical direction such that it rotates about an axis in a vertical direction. The welding apparatus includes welding machines (11) provided to project outward from the support body (12), in which welding heads for welding a work are arranged in a plurality of different directions. The welding machines (11) include different welding heads or welding component supply machines of different welding components in accordance with a type of welding. It is possible to provide a projection welding apparatus capable of increasing types of weldable welding components to three or more.

A welding apparatus includes a rotary table (13) configured to support a support body (12) extending in a vertical direction such that it rotates about an axis in a vertical direction. The welding apparatus includes welding machines (11) provided to project outward from the support body (12), in which welding heads for welding a work are arranged in a plurality of different directions. The welding machines (11) include different welding heads or welding component supply machines of different welding components in accordance with a type of welding. It is possible to provide a projection welding apparatus capable of increasing types of weldable welding components to three or more.

An electrode is provided for the resistance welding of bolts, having an upper part and a lower part which are configured to be connectable together and, in the connected state, jointly provide a cavity, the upper part having an opening for introducing a bolt, and the lower part having a gas connection for a pressurized gas. A valve body, by way of which the opening is closable, is arranged in the cavity. As a result, applied compressed air is prevented from flowing out. Compressed air only emerges when the valve body opens up the opening.

In a refrigerant circuit component or valve device, the present invention projection-welds a connector to a cap member and prevents intrusion of spatter into a refrigerant circuit. A-cylinder section in which an inside hole of the connector is open is inserted in an inside hole formed in the center of the cap member. The area between the A-cylinder section and a projection of the connector is used as a spatter generation space. The projection of the connector abuts against the cap member and is projection-welded to form a welded part. The open end of the inside hole of the A-cylinder section is crimped to pressure-join the open end to the open end of the inside hole of the cap member. Spatter is sealed inside the spatter generation space. A portion of the surface layer to which the generated spatter adheres may be removed by machining to provide a spatter-removed structure.

In a refrigerant circuit component or valve device, the present invention projection-welds a connector to a cap member and prevents intrusion of spatter into a refrigerant circuit. A-cylinder section in which an inside hole of the connector is open is inserted in an inside hole formed in the center of the cap member. The area between the A-cylinder section and a projection of the connector is used as a spatter generation space. The projection of the connector abuts against the cap member and is projection-welded to form a welded part. The open end of the inside hole of the A-cylinder section is crimped to pressure-join the open end to the open end of the inside hole of the cap member. Spatter is sealed inside the spatter generation space. A portion of the surface layer to which the generated spatter adheres may be removed by machining to provide a spatter-removed structure.

A forged rivet for joining dissimilar materials includes a disc-shaped head and a shank. The shank includes: a first shank portion extending from the head; a ring-shaped protruding portion that protrudes outward at the lip of the first shank portion; and a second shank portion, the cross-sectional area of which is smaller than the first shank portion and which extends further in the direction of the tip from the protruding portion. On the surfaces of the shank and the head, surfaces that contact a light alloy material when the rivet is driven into the light alloy material, a coating film with a higher electrical resistance than steel is formed.

A method of projection welding hardware to a plated steel sheet for hot stamping, may include pressing hardware and a plated steel sheet in a state in which a welding projection on the hardware is in contact with the plated steel sheet, supplying a primary current to the hardware and the plated steel sheet in a state in which they are pressed, and supplying a secondary current to the hardware and the plated steel sheet.

The invention relates to a method for producing a component (1, 2) consisting of a fibre-reinforced plastic and prepared for the welding of a metal component (4), which comprises at least one fibre element (2) impregnated with a plastic matrix, wherein at least some portions of at least one metal joining partner (1) are integrated into a fibre element, a first section of the joining partner (1) being surrounded by the fibres of the fibre element (2) such that it is in contact therewith, and a second section of the joining partner (1) projecting over a surface of the fibre element (2) or lying at least in the surface, the joining partner (1) being connected, by at least some portions, to the liquid and hardening plastic matrix, especially at least by the first section. The invention also relates to a metal joining partner for integrating into a component consisting of fibre-reinforced plastic in order to weld a metal component (4) thereto.

The invention relates to a method for producing a component (1, 2) consisting of a fibre-reinforced plastic and prepared for the welding of a metal component (4), which comprises at least one fibre element (2) impregnated with a plastic matrix, wherein at least some portions of at least one metal joining partner (1) are integrated into a fibre element, a first section of the joining partner (1) being surrounded by the fibres of the fibre element (2) such that it is in contact therewith, and a second section of the joining partner (1) projecting over a surface of the fibre element (2) or lying at least in the surface, the joining partner (1) being connected, by at least some portions, to the liquid and hardening plastic matrix, especially at least by the first section. The invention also relates to a metal joining partner for integrating into a component consisting of fibre-reinforced plastic in order to weld a metal component (4) thereto.

A bead structure for non-pressure mark welding, which is applied to panels for joining a plurality of overlapped panels through projection welding may include a plurality of beads which protrude in the same direction toward an upper portion by pressing the panel disposed in a lower portion among the overlapped panels, and when center points of the beads are connected by a straight line, the beads are disposed to be distanced from each other at a predetermined to form a triangle.