| US 7,491,280 B2 | ||
| Systems and methods for welding of parts | ||
| Kevin Gordon, Jr., Framingham, Mass. (US) | ||
| Assigned to Schunk Ultraschalltechnik GmbH, Wettenberg (Germany) | ||
| Filed on May 02, 2007, as Appl. No. 11/743,286. | ||
| Application 11/743286 is a continuation of application No. 10/633177, filed on Aug. 01, 2003, abandoned. | ||
| Claims priority of application No. 103 19 797 (DE), filed on Apr. 30, 2003; and application No. 103 24 094 (DE), filed on May 27, 2003. | ||
| Prior Publication US 2007/0199641 A1, Aug. 30, 2007 | ||
| Int. Cl. B29C 65/08 (2006.01) | ||
| U.S. Cl. 156—64 [156/73.1] | 14 Claims |
| 1. A method for ultrasonic welding of parts by means of an ultrasonic welding device comprising at least a generator, a converter,
and a sonotrode, based on a set curve of a time-dependent welding parameter appropriate to a welding connection meeting set
requirements, where the welding duration corresponding to the set curve runs between a starting time t0 and an end time te, and
a) during the welding of the parts an actual curve of the time-dependent parameter is measured,
b) in the period between t0 and te the actual curve is compared with the set curve, and
c) at least one welding process parameter affecting welding is altered to a value chosen based on a difference between the
set curve and the actual curve at a time of comparison, in order that the difference is reduced during welding after the time
of comparison and the actual curve converges toward the set curve, and
wherein the at least one welding process parameter to be altered consists of one or more of: an amplitude of the sonotrode,
a frequency of the sonotrode, a pressure acting on the parts to be welded, a force acting on the parts to be welded, and an
energy input into the parts to be welded.
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