6 results about "Laser transmission welding" patented technology

Method for joining components (2, 3) by means of at least one weld (S), wherein: - defects in a weld (S) produced by a first laser transmission welding process between two components (2, 3) each formed at least partially from a thermoplastic material are identified; - if at least one defect is present, a second laser transmission welding process is carried out in a post-processing step of the weld (S), wherein at least one laser beam (L) is guided through a region of a first component (2) that is transparent to the laser beam (L) onto the weld (S) located in a contact area of ​​the components (2, 3), and the weld (S), or the weld (S) and the second component (3), or the weld (S) and both components (2, 3) are at least partially melted; - at least after melting, a defined post-processing joining pressure (NF) is applied to the components (2, 3).so that the components (2, 3) are pressed against each other in the molten area and the weld seam (S) and / or the second component (3) are compressed in the molten area by a predetermined post-processing settling distance (NW), - the molten area is cured while maintaining the post-processing joining pressure (NF), wherein in the first laser transmission welding process - the first component (2) is positioned on the further component (3) so that the components (2, 3) touch in the contact area, - subsequently at least one laser beam (L) is guided through the area of ​​the first component (2) that is transparent to the laser beam (L) onto an area of ​​the second component (3) located in the contact area and this area is at least partially melted, - by heat conduction from the molten area of ​​the second component (3) the first component (2) is at least partially melted in the contact area,- at least after melting, a defined joining pressure (F) is applied to the components (2, 3) so that the first component (2) is pressed against the second component (3) in the melted area and at least the second component (3) is compressed in its melted area by a predetermined settling distance (W), - the melted area is cured while maintaining the joining pressure (F), and in post-processing, parameters of the laser beam (L) and / or the post-processing joining pressure (NF) are selected such that the post-processing settling distance (NW) is smaller than the settling distance (W) generated by the joining pressure (F).

The invention relates to laser welding of objects, to a laser transmission welding method, and to a laser transparent polymer composition used therein, comprising at least a combination of: (A) a polybutylene terephthalate resin (PBT resin); and (B) a dialkali metal salt of norbornane-2,3-dicarboxylic acid, or a substituted derivative thereof; and / or a polyester copolymer comprising repeating units derived from the dialkali metal salt or substituted derivative thereof incorporated into the PBT resin (referred to as A / B copolymer).

The invention is based on an electronics device comprising a housing composed of at least a first and a second housing element, wherein at least the first housing element is formed from a weldable plastic material. The two housing elements are integrally bonded to one another in a joining zone by means of a weld seam, in particular a laser weld seam formed by laser transmission welding. In the bonded state, a cavity containing at least one circuit carrier with an electrical and / or electronic circuit arranged thereon is formed in the housing. The at least one circuit carrier is placed in at least one of the housing elements before they are joined. At least in the joining zone, the plastic material of the first housing element is chosen and designed to melt by absorbing electromagnetic radiation at wavelengths within a welding wavelength range (λ_weld) defined therefor and to form the weld seam by solidifying from the molten state of the material. The material of the second housing element is at least partially permeable to electromagnetic radiation at frequencies within the defined welding wavelength range (λ_weld) up to the joining zone. Furthermore, a protective region of the housing at least comprising a portion of the second housing element is designed in that the region to be protected has an additional material layer which is separate from the material of the second housing element. This material layer is designed to prevent interference radiation from a defined interference frequency spectrum (F_interference), at least partially comprising the welding frequency spectrum (F_weld), from penetrating into the cavity of the housing.

A curved and one-sidedly open waveguide for plastic welding, especially for laser transmission welding, includes a first reflecting element having a reflecting surface by means of which laser light can be reflected. The reflecting surface defines a receiving end at which laser light from a laser light source, in particular a light guide or a plurality of light guides, is receivable, and an output end at which laser light is directable into a laser light transmitting work piece. The reflecting surface is defined by a curve between the receiving end and the output end so that the reflecting surface of the first reflecting element has a continuously curved concave shape when viewed in cross-section. Further, the first reflecting element is not opposed by a second reflecting element so that the waveguide is open in the direction normal to the reflecting surface.

The application discloses a laser transmission welding quality detection method based on a flexible stress strain sensor, and comprises the following steps: laminating a light transmission layer film and a light absorption layer film; attaching a sensor array to the back of the light absorption layer film and connecting array units of the sensor array to a multi-channel data acquisition system; projecting laser for welding and synchronously collecting compressive stress characteristic parameters of the sensor array; performing off-line quality detection on weld samples prepared under different welding parameters, measuring weld depth characteristic parameters through an optical microscope; and establishing a multiple regression model of the compressive stress characteristic parameters and the weld depth characteristic parameters. The application arranges a flexible stress strain sensor array on the back of a weld, collects stress distribution information in a welding process in real time, and evaluates the internal quality of the weld through data processing and an established correlation model, so that an effective technical means is provided for realizing laser welding with high precision, high quality and high stability.

The application provides a glass and metal rapid laser welding method based on a laser deposition technology. The application comprises two welding paths. Path one comprises the following steps: 1, focusing laser through glass to inorganic target material, scanning and ablation of the target material to deposit inorganic film on the glass; 2, placing the glass with deposited film on an aluminum-based metal to be welded, and performing laser transmission welding with a scanning speed of 1-10 m / s. Path two comprises the following steps: 1, depositing an aluminum film on the surface of the metal; 2, focusing laser through glass to inorganic target material, scanning and ablation of the inorganic target material to deposit film on the glass; 3, placing the glass with deposited inorganic film on the metal with the deposited aluminum film, and performing laser transmission welding with a scanning speed of 1-10 m / s. The glass and metal laser welding method has high welding strength, is rapid and efficient, is hundreds of times faster than traditional process welding speed, and is suitable for large-scale production.