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US 8,075,725 B2Granted
Method and device for welding thermoplastic material shaped parts, particularly for contour-welding three-dimensional shaped parts
AssigneeLaserquipment AG
InventorsAlexander Hofmann, Stefan Hierl
Life of this patent
Estimating the term…
Abstract
The invention relates to a method and an apparatus for welding thermoplastic molded articles wherein additional simultaneous irradiation, in the welding area (18), of one of the join partners (1) will lead to a temperature increase of this join partner, occasioning process-reliable welding.
Claims7
A method of contour-welding three-dimensional thermoplastic molded articles, comprising:
- moving a laser-absorptive join partner and a laser transmissive join partner into contact with one another in the vicinity of a three-dimensional outline that is to be co-welded;
- heating the join partners in a process consisting of
- exposing the laser-absorptive join partner to radiation in a welding area by a laser welding beam and transmitting the laser welding beam through the laser transmissive join partner to weld together the join partners;
- and
- additionally and simultaneously exposing the laser transmissive join partner in the welding area to an electromagnetic secondary radiation from a source different from a laser and selected from the group consisting of IR and UV radiation for selective temperature increase of the welding area such that the temperature field in the welding area is homogenized with respect to a molten phase and an inter-layer plasticizing zone of the join partners, wherein the secondary radiation comprises at least beam fractions that deviate from the wavelength of the laser welding beam.
2 more elements
A method of contour welding three-dimensional thermoplastic molded articles, comprising:
- a. moving a laser-absorptive join partner and a laser-transmissive join partner into contact in the vicinity of an outline that is to be co-welded along a welding level;
- b. heating the join partners by a method consisting of
- c. exposing the laser-absorptive join partner to radiation in a welding area by a laser welding beam and transmitting the laser welding beam through the laser transmissive join partner;
- while
- d. simultaneously exposing the laser transmissive join partner in the welding area to secondary electromagnetic radiation from a source different from a laser and selected from the group consisting of IR and UV radiation whereby the temperature field in the welding area is homogenized with respect to a molten phase and an inter-layer plasticizing zone of the join partners, on both sides of the welding level, wherein the secondary radiation comprises at least beam fractions that deviate from the wavelength of the laser welding beam.
2 more elements
Dependencies are inferred from the claim text.