A method for laser additive manufacturing of a mechanical part includes providing a laser beam the operation of which will be controlled by a computer into which is introduced a CAD computer file which is cut into one or more strata which, once superimposed, allow to form the structure of the desired mechanical part, disposing a substrate in a manufacturing enclosure wherein an atmosphere of a neutral gas is created, depositing on the substrate at least a first layer of a powder of a first metallic material to be melted, levelling the first layer, subjecting by means of the laser beam the first layer to a selective melting step, if necessary, depositing on the substrate a second layer, levelling the second layer and subjecting this second layer to a step of selective melting, removing the excess material and cleaning the assembly and subjecting the part to finishing operations.

The invention provides a surface treatment method for a magnesium alloy hub. The process includes: cleaning a to-be-treated surface of the magnesium alloy hub; blackening the cleaned to-be-treated surface; and laser cladding the blackened to-be-treated surface, wherein a laser cladding mode is a synchronous powder feeding mode, and a coating material is chromium. According to the surface treatment method for the magnesium alloy hub, air holes can be avoided.

The invention discloses a method for preparing an anticorrosive surface layer of a metal material in a marine environment by laser, which belongs to the technical field of laser processing. First, the laser cladding method is used to prepare a cladding surface layer on the surface of the metal material that is not easy to undergo chemical substitution reaction with the chlorides (NaCl, MgCl.sub.2 , CaCl.sub.2 etc.) in the seawater. Then, on the surface of the cladding surface layer, ultrafast laser processing is used to form a surface layer with a wetting angle (and water) greater than 90 degrees and with hydrophobic characteristics. The anti-corrosion surface layer obtained by the invention has hydrophobic properties, the high humidity and high salt water vapor and marine organisms in the marine environment are not easy to adhere, and the anti-corrosion surface layer is stable in salt water resistance, and is not easy to undergo chemical substitution reaction with chlorides in seawater (NaCl, MgCl.sub.2 , CaCl.sub.2 etc.), which can achieve high-efficiency anti-corrosion of metal materials in the marine environment.

A shift in position of a laser beam used for welding objects is corrected without need for intervention by a welder. An irradiator performs welding along a welding part of objects to be welded by relatively moving objects to be welded and a nozzle for emitting a laser beam. An arm apparatus movably holds the nozzle while applying a biasing force to the nozzle in a direction toward the welding part such that the nozzle comes into contact with objects to be welded to irradiate the welding part with the laser beam.

An article includes a ceramic material and features a machined surface that is characteristic of cold ablation laser machining, and the machined surface exhibits no visible oxidation. A laser machining apparatus and technique is based on cold-ablation, but is modified or augmented with an inert assist gas to minimize deleterious surface modifications and mitigate oxide formation associated with laser machining.

An additive manufacturing method wherein an object is manufactured by powder being applied layer-by-layer by an application device onto a base along a buildup surface and being bonded in regions to form a matrix. To provide an efficient additive powder bed method, a position of the base is checked by at least one measurement with a sensor device and the position of the base is automatically corrected at least in relation to the application device based on the at least one measurement.

A production method for welding a copper conductor to an electrical contact element of a workpiece for electrical contacting. The contact element has a first copper alloy, and the method has the following method steps: mechanical contacting between the copper conductor and the contact element at a join of the contact element, the welding of the copper conductor to the contact element being carried out with the aid of a focused laser beam, the laser beam having a wavelength of less than or equal to 0.6 μm, and a welded seam is produced which has a welding depth that is greater than or equal to 100 μm.

The present disclosure provides three-dimensional (3D) objects, 3D printing processes, as well as methods, apparatuses and systems for the production of a 3D object. Methods, apparatuses and systems of the present disclosure may reduce or eliminate the need for auxiliary supports. The present disclosure provides three dimensional (3D) objects printed utilizing the printing processes, methods, apparatuses and systems described herein.

The present invention benefits from the determination that pre-selected spectral bandwidths that avoid the spectrum of an electronic transition of a metal/alloy vapor allow for welds substantially free from detritus that may discolor the weld. Accordingly, the present invention provides analytical methods, welding methods and fiber lasers configured to provide high quality metal/alloy welds.

An optical module for a machine for machining workpieces and/or for producing molded bodies by way of location-selective solidification of material powder into contiguous regions by a laser beam includes a housing for releasably fastening the optical module to the machine and a collimation optics changer releasably arranged in the housing, having at least two collimation optics which can be moved into a beam path of the laser beam for collimating the laser beam. The collimation optics changer has a mechanism for automatically changing the collimation optics.