Projection welding apparatus, projection welding method and projection welding structure

摘要

A projection welding apparatus comprising a first electrode; a second electrode, a first and a second plate members to be welded are provided between the first and second electrodes, the second plate member includes a facing portion and an extension portion extending from the facing portion towards the first plate member and an end face of the extension portion abuts with welding projections provided on the first plate member; a pressing unit causing the second electrode to approach the first electrode, and presses the end face of the extension portion against the welding projections via the second electrode; a voltage application unit causing current to flow in the both plate members; and a stopper member, disposed between the first electrode and the facing portion, is contacted against the facing portion, and electrically connects the facing portion and the first electrode so as to bypass the first plate member.

主权项

1. A projection welding apparatus for welding a first plate member, that has a plurality of welding projections formed on a front-face side, to a second plate member, the apparatus comprising:
a first electrode disposed on a back-face side of the first plate member; a second electrode disposed to face the first electrode, the first plate member and the second plate member being configured to be provided between the first electrode and the second electrode, the second plate member being configured to include a facing portion that faces the front-face side of the first plate member and an extension portion that extends from the facing portion towards the first plate member and an extension direction end face of the extension portion is configured to abut with the welding projections; a pressing unit that causes the second electrode to approach the first electrode, presses the second plate member with the second electrode, and presses the end face of the extension portion against the welding projections; a voltage application unit that applies a voltage to the first electrode and the second electrode causing current to flow in the first plate member and the second plate member; and a stopper member that is electrically conductive, is disposed between the first electrode and the facing portion with a separation open to the facing portion, is contacted against the facing portion of the second plate member that is configured to be pressed by the second electrode, restricts the first electrode and the second electrode from approaching each other and electrically connects the facing portion and the first electrode so as to bypass the first plate member, wherein the second plate member is configured to have a C-shaped cross-section and the stopper member is provided inside the C-shaped cross-section of the second plate member.