Electric heating – Metal heating – For bonding with pressure
Patent
1989-10-27
1992-05-12
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 861, B23K 1100
Patent
active
051130548
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of joint welding, particularly resistance welding, of small structural component parts wherein the parts are pressed together by a transmitting element and are welded by application of heat. Such a method, in which a plurality of electrical conductors or a disk of brittle material is assigned to the small or miniature structural component parts, is known from DE-AS 17 52 679. The base and the conductors are brought together, pressed together by the transmitting element and are welded together in cooperation with the transmitted pressure by thermal compression or ultrasonics. The pressure is transmitted by a deformable transmitting material which is acted upon by the transmitting element and acts directly and simultaneously on all conductors and on the entire assigned surface of the disk, respectively. Accordingly, a connecting method is to be achieved which increases the rate of good connections achieved when the thickness of the structural component parts is subject to tolerances and which can also be used simultaneously for producing a plurality of connections. The conductors are exposed to a deformation when applied to the base, the magnitude of the deformation depending on the utilized materials, the mechanical energy supplied, the geometrical form of the pieces, and the heat supply. In the initial phase of the welding process, the pressure at the boundary surface between the transmitting material and the conductors is higher by a multiple than the pressure at the boundary surface between the transmitting element and the transmitting material due to the much smaller contact surface. If the transmitting material has deformed around the conductors and contacted the base, the contact area increases as the pressure decreases until it corresponds to the magnitude of the boundary surface between the transmitting element and the transmitting material, i.e. the pressure drops and the deformation stops. When applying the method for welding disks comprising a hard material which can not be deformed, e.g. metallized silicon, no pressure differential occurs between the two boundary surfaces between the transmitting material and disk and between the disk and base, since the boundary surfaces have the same dimensions.
Further, a device is known from DE-PS 20 49 277 for welding spherical contact metal blanks on contact parts by electrical resistance welding, in which device, an electrode is provided with a cup-shaped recess at its head end for receiving a spherical contact metal blank. In this device, the pressure and heat are transmitted by the electrode directly to the ball to be welded on.
SUMMARY OF THE INVENTION
The object of the invention is a method of joint welding in which the pressure transmitting contact or boundary surface between the structural component part, which acts as shaping body, and the transmitting material is drastically increased by deformation of the latter, while the boundary surface between the structural component parts at which the welding takes place is comparatively small and, under pressure and the influence of heat, preferably also remains clearly smaller than the pressure transmitting contact surface between the deformed transmitting material and the structural component part acting as shaping body. The object of the invention is achieved by making the pressure-transmitting contact surface between the deformed transmitting material and the structural component part acting as a shaping body, greater than the surface at which structural component parts are welded together. With this method, it is possible to produce structural components comprising a plurality of individual parts, e.g. spherical valve bodies, in a simple manner without the original shape and material structure of the exposed portion of the ball, which acts a shaping body, being changed during the welding process. The pressure required for welding is transmitted to the shaping body by the deformed transmitting material along a large surface area and with
REFERENCES:
patent: 3488841 (1970-01-01), Stern
patent: 4385222 (1983-05-01), Hinden
patent: 4752026 (1988-06-01), Van De Griend
Hund Paul
Jenner Wolfgang
Langer Lothar
Robert & Bosch GmbH
Shaw Clifford C.
Striker Michael J.
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