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Device and method for carrying out and monitoring a plastic laser transmission welding process

A technology of laser transmission welding and process, which is applied in the direction of laser welding equipment, measuring devices, welding equipment, etc., and can solve the problems of not providing more detailed descriptions of weld seams, workpiece rejection, etc.

Inactive Publication Date: 2014-05-07
LPKF LASER & ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This existing monitoring method implemented on welds only allows the determination of disturbances in the detected reflected measurement beam caused by imperfections in the weld, which ar

Method used

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  • Device and method for carrying out and monitoring a plastic laser transmission welding process
  • Device and method for carrying out and monitoring a plastic laser transmission welding process
  • Device and method for carrying out and monitoring a plastic laser transmission welding process

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Embodiment Construction

[0024] figure 1 A first embodiment of a device for carrying out and monitoring a plastic laser transmission welding process is shown. The process beam source for generating and emitting a laser beam which is used as a process beam entering the joining region 1 of the two joining elements 2, 3 is not shown in more detail, since it corresponds to the Process beam source used in traditional laser transmission welding. The process beam source is used to form a weld seam 4 between two joining elements 2, 3, as in the figure 1 Between the two joining elements 2, 3 is shown in a cross-sectional view.

[0025] In order to determine the depth position of the interface 5 between the weld seam 4 and the joining elements 2, 3, in other words for welding depth monitoring in the corresponding laser transmission welding process, a measuring beam source 6 in the form of a point light source is provided, which The measuring beam 7 is processed by a lens 8 and an aperture 9 to obtain a focus...

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Abstract

A device and a method for carrying out and monitoring a plastic laser transmission welding process comprises a processing beam source for emitting a processing beam into a joining zone (1) between two parts being joined (2, 3) while forming a weld (4), a measuring beam source (6) for irradiating a measuring zone (12) with a measuring beam (7), a detection unit (13) for detecting the measuring beam (7) reflected by an interface (5) between the weld (4) and its surroundings in the parts being joined (2, 3), and an evaluation unit (15), connected to the detection unit (13), for determining the depth position of the interface (5) in the parts being joined (2, 3) from the reflected measuring beam (7) that is detected.

Description

technical field [0001] The invention relates to a device and a method for carrying out and monitoring a laser transmission welding process of plastics, having the technical features as stated in the preamble of claim 1 or 11, respectively. Background technique [0002] The technique of laser transmission welding of plastics is disclosed in several documents, for example EP 1 575 756 B1 or DE 10 2004 036 576 B4. [0003] Generally speaking, the transmissive joining element of the laser process beam is placed on the joining element which absorbs said beam. A molten pool is produced in the absorptive joint element when the corresponding joint region located between the two joint elements is exposed to the light beam emitted through the transmissive joint element. As a result of the contact with the transmissive joining element, a corresponding amount of thermal energy is transferred into the transmissive joining element, causing the transmissive joining element to also melt in...

Claims

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Application Information

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IPC IPC(8): B29C65/16B29C65/82G01N21/17G01N21/958
CPCB29C65/1638B29C65/1654B29C65/1674B29C66/1122B29C66/41B29C66/836B29C66/952B29C65/8253B23K26/0648B29C66/91216B23K31/125G01J5/0014B29C66/91411B29C65/1635B29C66/961B29C66/9161B29C65/00G01J5/48B29C65/16
Inventor M·西本D·赫特勒
Owner LPKF LASER & ELECTRONICS
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