Patent EP-2347852-A1 (EP)
Inventor: HAENSCH DR DIRK
IPC: B23K26/00
Filed: 2010-01-26
Abstract: The laser-welding device comprises a contact surface (1a), a pneumatic pressing device (3), which has a compressed air source (4) to compress the layers of flat materials arranged on the contact surface one upon the other against the contact surface in a welding area by compressed air, and a laser (2), which is positioned above the contact surface to weld the layers of the flat materials in the welding area. The pressing device has a pressing head having a main body (6), in which a pressure chamber is designed. The pressure chamber is connected on the inlet side to the compressed air source. The laser-welding device comprises a contact surface (1a), a pneumatic pressing device (3), which has a compressed air source (4) to compress the layers of flat materials arranged on the contact surface one upon the other against the contact surface in a welding area by compressed air, and a laser (2), which is positioned above the contact surface to weld the layers of the flat materials in the welding area. The pressing device includes a pressing head having a main body (6), in which a pressure chamber is designed. The pressure chamber is connected on the inlet side to the compressed air source over a compressed air supply line, and on the outlet side to an air outlet opening provided on the underside of the main body pointing to the contact surface. The pressing head is positioned on or directly above the contact surface and is freely movably guided toward and away from the contact surface, so that it lifts off from the contact surface after positioning on the layers of the material to be welded lying on the contact surface (1a) upon escape of air out of the air outlet opening forming a gap. The pressing head is designed so that a laser beam output from the laser hits on the welding region by the pressing head. A central air exit opening is provided in the main body, so that the laser beam centrically runs through the air exit opening. The pressure chamber is centrally formed in the main body and is closed at its upper side and lower side with a laser-transparent and pressure-tight window, so that the laser beam delivered from the laser penetrates through the window and the pressure chamber and hits on the welding area, where several channels are designed at the lower side of the main body and outwardly extend from the central air exit opening and several air exit openings connected with the pressure chamber are provided to the pressure-tight window at the lower side of the pressure chamber. The air exit opening and/or the air outlet line arranged to the air exit opening are formed in a nozzle-like manner. The pressing head has a cylindrical base form, is connected with the laser and is processable mutually with the laser parallel to the contact surface. The pressing head is movably held vertical to the contact surface relative to the laser. A control device, over which the strength of the air flow directed from the pressing head against the contact surface is adjustable, is arranged to the pressing device. An independent claim is included for a pressing head.