A method for laser welding two coated workpieces includes positioning an upper workpiece and a lower workpiece on top of each other and passing a first laser beam over the upper and lower workpieces from a side of the upper workpiece so as to at least partially evaporate the respective coating of each of the workpieces on their facing sides along a depletion trace. A second laser beam is passed over the workpieces from the side of the upper workpiece so as to melt a material of the two workpieces within the depletion trace, and thereby weld the workpieces to one another. In the first laser passing, the first laser beam melts the material of the upper workpiece, so that a web of non-melted material of the upper workpiece remaining between the melted material of the upper workpiece and the facing side of the upper workpiece.

The disclosure belongs to the technical field of high-power laser welding, and discloses a method and system for optimizing process parameters to suppress pores in high-power laser shaping welding. The method includes: obtaining the relationship between the adjustable annular laser beam diameter, the linear energy at the center point, with welding process parameters; and establishing optimization constraint conditions for them; obtaining the preset range of process parameters and substituting parameter values within this range into the optimization constraint conditions; the process parameter combinations that meet both optimization constraint conditions are the optimized process parameters. This disclosure, by flexibly adjusting the power ratio of the central Gaussian beam and the outer annular beam, significantly improves the pore problem in laser welding of aluminum alloys while ensuring large penetration depth, providing reference for high-quality welding of aluminum alloys.

A method for realizing high-speed cladding of hollow offset-focus annual laser. The method includes the following steps: dividing laser into annual light, and forming an offset-focus annual light spot after the annual light is focused, which acts on a surface of a matrix; during cladding for the surface of the matrix, selecting laser parameters according to different materials; after every cladding, making a shift by 20-80% of the diameter of the light spot in a vertical direction of a scanning speed of the laser; in the cladding process, selecting shielding gas for protection, and blowing the shielding gas to the molten powder in the air to spray the molten powder in air towards the surface of the matrix at a certain speed so that the cladding layer and the matrix are bonded firmly, and cladding the surface of the matrix to form a coating layer.

A system includes a pipe for transporting one or more fluids, the pipe including a scale deposit formed on an inner circumferential surface thereof and defining a reduced diameter flow area within the pipe, and a hybrid descaling tool sized to be received within the pipe. The hybrid descaling tool includes a laser head comprising a hollow cylindrical body with an internal, ring-shaped laser path, the laser head operable to emit a ring-shaped laser beam through the ring-shaped laser path, and an acid nozzle protruding forward from the hollow cylindrical body of the laser head and into the reduced diameter flow area, the acid nozzle including one or more acid outlets within the reduced diameter flow area.

A laser processing apparatus includes a stage to support a substrate, a laser light source to generate a source laser beam, a first beam divider to divide the source laser beam into first and second laser beams in a first horizontal direction, a second beam divider to divide the first laser beams into a plurality of first laser sub-beams in a second horizontal direction and to divide the second laser beam into a plurality of second laser sub-beams in the second horizontal direction, and a condensing lens to condense the plurality of first laser sub-beams into a plurality of first laser branch beams that are spaced apart along a first scan line on the substrate and to condense the plurality of second laser sub-beams into a plurality of second laser branch beams spaced apart along a second scan line parallel with the first scan line on the substrate.

The invention concerns an apparatus and its use for laser welding. A laser welding apparatus comprise at least one first laser device, each providing at least one first optical feed fiber with a first laser beam; at least one second laser device, each providing at least one second optical feed fiber with a second laser beam; means for generating a composite laser beam comprising a first output laser beam and a second output laser beam for welding a workpiece; wherein the first output laser beam has a circular cross-section and the second output laser beam has an annular shape concentric to the first output laser beam. The second laser device is a fiber laser device or a fiber-coupled laser device. The apparatus is configured to form the second output laser beam at least on the basis of the second laser beam, and the second output laser beam comprises a first wavelength and a second wavelength having difference of at least 10 nanometers, or the second output laser beam has spectrum width of least 10 nanometers.

A method for laser welding of a workpiece includes providing a laser beam using a laser beam source, collimating the laser beam using a collimation optical unit, reshaping the collimated laser beam using a reshaping optical unit, and focusing the reshaped laser beam using a focusing unit. The focused laser beam is directed onto the workpiece to be welded. The reshaping optical unit has a first partial region in which at least one part of at least one axicon is embodied. At least a part of a beam cross-section of the collimated laser beam is directed onto the partial region of the reshaping optical unit.

A laser system and method is used to micro-drill a web producing holes of approximately 85 m or less. The laser system comprises a laser beam having a wavelength in the range of approximately 2 to 6 microns and the focal point of the laser beam being steered onto a surface of the moving web wherein the web is moving. The web is a film such as a flexible film or commercial packaging film. The laser beam wavelength and constant laser energy can be used to laser micro-drill the flexible film.

A method of splitting a semiconductor work piece includes: forming a separation zone within the semiconductor work piece, wherein forming the separation zone comprises modifying semiconductor material of the semiconductor work piece at a plurality of targeted positions within the separation zone in at least one physical property which increases thermo-mechanical stress within the separation zone relative to a remainder of the semiconductor work piece, wherein modifying the semiconductor material in one of the targeted positions comprises focusing at least two laser beams to the targeted position; and applying an external force or stress to the semiconductor work piece such that at least one crack propagates along the separation zone and the semiconductor work piece splits into two separate pieces. Additional work piece splitting techniques and techniques for compensating work piece deformation that occurs during the splitting process are also described.

A workpiece processing method includes performing additive manufacturing for a first region of a workpiece; and performing additive manufacturing for a second region of the workpiece, the second region being smaller in width than the first region. The performing additive manufacturing for the first region includes positioning an additive-manufacturing head and the workpiece relative to each other so as to make a distance between the workpiece and a laser beam emitter in the additive-manufacturing head equal to a first distance. The performing additive manufacturing for the second region includes positioning the additive-manufacturing head and the workpiece relative to each other so as to make the distance between the workpiece and the laser beam emitter in the additive-manufacturing head equal to a second distance that is smaller than the first distance.