Abstract:
Zur Ermittlung des Schweissstromes für die Widerstandsnahtschweissung der Überlappnaht von Behälterzargen wird bei einer Testzarge eine Schweissung mit sich ändernder Schweissstromstärke durchgeführt, die bei der Testzarge eine sich ändernde Verschweissung der Naht ergibt, die von der Schweissung mit zu hoher Temperatur bis zur Schweissung mit zu tiefer Temperatur bei dieser Naht ergibt. Dabei wird die Schweissstromstärke bei der Schweissung erfasst, so dass erfasst ist, an welcher Stelle der Naht mit welcher Stärke des Schweissstromes geschweisst wird. Mittels einer mechanischen und/oder optischen Prüfung der Schweissnaht kann dann einfach festgestellt werden, wo die Naht eine korrekte, für die Serienproduktion von Behälterzargen aus demselben Blechmaterial wie die Testzarge geeignete Verschweissung aufweist. Ist eine solche Stelle oder ein solcher Bereich der Naht bekannt, so kann der dabei bei der Testschweissung angelegte Schweissstrom für die Serienproduktion als Schweissstrom übernommen werden.
Abstract:
An inward edge flange (6) with an inserted sealing ring (7) is arranged in the form of a valve seat (5) at the free end of a constricted can neck (4) on a can body (1). The inward edge flange (6) holds the sealing ring (7) without completely surrounding it, and said sealing ring is therefore accessible from the interior of the can lateral surface (3). After the crimping of a valve part (9), an inner stop (7b) is formed between the sealing ring (7) and the connecting shell flange (6). Since the sealing ring (7) is elastic, the connecting shell flange (6) bears against the sealing ring (7) without gaps along the entire circumference. The sealing ring (7) also bears tightly against an inner contact surface of the inward edge flange (6) of the can body (1).
Abstract:
The aim of the invention is to fix a valve piece encompassing a connecting shell and a valve (62) to a can jacket (24). Said aim is achieved in a welding step in which the connecting shell of the valve piece is fastened to the can jacket (24) as a top closing element (31a) along with the valve (62) by means of laser welding. According to the invention, a shoulder-shaped constricted cross section is embodied on the can jacket (24) towards the top face (24a) thereof while the border area of the closing element (31a) which rests against said shoulder (60a) is tightly pressed thereagainst and is sealingly joined to a laser seam (42), the top face (24a) of the can jacket (24) lying inside the can. The inventive method dispenses with the need to configure or fix a valve seat while eliminating the technically complex crimping step, thus also dispensing with the need for an installation used for crimping connecting shells in the filling station. The invention makes it possible to produce also aerosol cans whose diameter is smaller than the diameter of a standard valve seat.
Abstract:
According to the invention, to produce can bodies (148, 248), a continuous can jacket (140, 24, 240) that is sealed by means of a first joint is produced from a flat metal material (103, 116). At least one sealing element (142, 31a, 31b, 242) is mounted on the continuous can jacket (140, 24, 240) by means of an additional joint. At least one of the additional joints is configured as a laser welding seam, which forms an annular continuous sealing seam (145, 42, 245) between the continuous can jacket (140, 24, 240) and the sealing element(s) (142, 31a, 31b, 242). Before the sealing seam (145, 42, 245) is welded, complementary seam contact surfaces of the can jacket (140, 24, 240) and the sealing element (142, 31a, 31b, 242) are configured as annular continuous edge regions (140a, 60a, 142a, 240a, 242a) that flare out or narrow towards the can axis. To weld the sealing seam (145, 42, 245), the can jacket (140, 24, 240) and the sealing element(s) (142, 31a, 31b, 242) are pushed together until the edge regions (140a, 60a, 142a, 240a, 242a) make contact, one of the end faces (140b, 142b, 240b, 242b) of the two edge regions (140a, 60a 142a, 240a 242a) lying on the interior of the can body (148, 248) and the other lying on the exterior of said body. The invention enables the air-free welding of the seam contact surfaces, thus guaranteeing an impermeable welding seam even with the use of extremely thin metal sheets. The material overlap in the vicinity of the sealing seam (145, 42, 245) is minimal.