Abstract: Personal data may be embedded in a kinegram of an identification document using a suitable low energy laser without compromising the integrity of the kinegram or the identification document. The personal data can be written in a metalized portion of the kinegram in a high definition, high resolution manner such that the personal data may be read by a human without the use of a text-enhancing viewer device (e.g., magnifying glasses). Additional personal data can be written in a reduced text size (e.g., micro-text) in another metalized portion of the kinegram such that a human must use a text-enhancing viewer device to view the micro-text personal data.

Abstract: A method for energy calibration of a pulsed cutting laser for eye surgery comprises irradiating a sample material with a plurality of sets of laser pulses of the cutting laser with pulse energies differing from set to set. This method also comprises analyzing at least one visually perceptible discoloration structure created in the sample material as a result of the irradiation, selecting the pulse energy of one of the sets based on the analysis, and setting a treatment pulse energy for the cutting laser based on the selected energy.

Abstract: This disclosure provides a device for heating to generate a uniform molten pool, including: a source unit for generating an energy beam; a beam expanding/reducing unit positioned in an energy path of the energy beam for adjusting the diameter of the energy beam; a flat-top conical lens set positioned in the energy path and including at least two flat-top axicons, with the beam expanding/reducing unit positioned between the source unit and the flat-top conical lens set; and a focusing lens positioned in the energy path, with the flat-top conical lens set between the beam expanding/reducing unit and the focusing lens, and the energy beam being focused by the focusing lens. This disclosure generates a uniform molten pool to prevent vaporization splash due to overheating of the material during melting.

Abstract: A welding method according to the invention is a welding method in which welding is performed by emitting a high-energy beam onto a welding object that includes a plurality of overlapped metal sheets. This welding method includes forming a tack weld nugget at a welding point on the welding object, and forming a plurality of final weld nuggets along a virtual closed curve that encircles the tack weld nugget, while leaving the tack weld nugget, at the welding point.

Abstract: A laser processing system able to realize both reduction of the power consumption and shortening of the cycle time. The laser processing system is provided with a laser oscillator, a laser processing machine which has a movement mechanism which makes the irradiation position of the laser light on the workpiece move, a mode switching part which switches an operation mode of the laser oscillator between a standard-standby mode and an energy saving mode, a movement controller controlling the movement mechanism so as to place the irradiation position at a process start point placed at a non-product region of the workpiece, and a switching controller controlling the mode switching part to switch the operation mode from the energy saving mode to the standard-standby mode when placing the irradiation position at the process start point.

Abstract: A process is disclosed for laser-welding sheet metal plates that have an aluminum-silicon containing pre-coat layer. The pre-coated sheet metal plates are arranged one relative to another such that an edge of one of the plates is adjacent to and in contact with an edge of the other one of the plates, and a laser-welded joint is formed along the adjacent edges of the pre-coated plates. In particular the joint is formed absent removing the aluminum-silicon containing layer from along the adjacent edges, such that aluminum from the aluminum-silicon containing layer enters into the melt pool that is formed. Additionally, an alloying material is introduced into the melt pool during forming the laser-welded joint and forms a compound with at least some of the aluminum in the melt pool.

Abstract: A process is described for laser welding a sheet metal workpiece having an aluminum-silicon containing pre-coat layer disposed on at least one major surface thereof, and having first and second opposite side edges. The sheet metal workpiece is arranged such that the first and second side edges are in contact with one another and such that the at least one major surface faces outwardly. A closed tube-shaped product is obtained by forming a laser-weld joint between the first and second side edges. In particular the laser-weld joint is formed absent removing the aluminum-silicon containing layer from along the adjacent edges, such that aluminum from the aluminum-silicon containing layer enters into the melt pool that is formed. An alloying material is introduced into the melt pool during laser welding and forms a compound with at least some of the aluminum in the melt pool.

Abstract: A method and system to manufacture workpieces employing a high intensity energy source to create a puddle and at least one resistively heated wire which is heated to at or near its melting temperature and deposited into the puddle as droplets.

Abstract: A method of manufacturing an undercarriage track joint assembly includes forming at least a first portion of a seal assembly by laser brazing an annular, metal sealing washer to a first track link of the undercarriage track joint assembly. The method may also include performing the laser brazing to form at least one of an annular fillet of braze material between the first track link and at least a portion of an inner diameter surface of the washer and an annular fillet of braze material between the first track link and at least a portion of an outer diameter surface of the washer.

Abstract: A security code input may be obfuscated from a thermal imaging device by randomly heating a random set of inputs of an input device. The security code is inputted on an input device, which communicates with a security system to grant or deny access to a user based on an entry of the security code. The input device includes a plurality of hearing elements. The input device may receive an input from the user. A random set of heating elements including one or more heating elements, are generated from the plurality of heating elements. A temperature is determined for the one or more heating elements of the random set of heating elements. The temperature is then applied to the one or more heating elements of the random set of heating elements of the input device.

Abstract: A hybrid laser machining and metrology method that enables one-up assembly of a work piece is disclosed. The hybrid machining and metrology method may include interleaving a first laser output to remove material from the work piece with a second laser output to measure material removed from the work piece.

Abstract: Methods and systems are provided for using optical interferometry in the context of material modification processes such as surgical laser or welding applications. An imaging optical source that produces imaging light. A feedback controller controls at least one processing parameter of the material modification process based on an interferometry output generated using the imaging light. A method of processing interferograms is provided based on homodyne filtering. A method of generating a record of a material modification process using an interferometry output is provided.

Abstract: A laser patterning apparatus for a three-dimensional object includes a laser generator, a beam expander configured to adjust a size of a laser beam generated by the laser generator, a dynamic focusing module configured to adjust a z-axis focus position of the laser beam passing through the beam expander, a scan head configured to adjust x- and y-axis focus position of the laser beam passing through the beam expander, a shape recognizer configured to recognize a shape of a three-dimensional object, and a controller configured to extract x-, y-, and z-axis data of the three-dimensional object and to control the scan head and the dynamic focusing module, in order to pattern the three-dimensional object with the laser beam.

Abstract: Systems and methods for forming apertures in microfeature workpieces are disclosed herein. In one embodiment, a method includes directing a laser beam toward a microfeature workpiece to form an aperture and sensing the laser beam pass through the microfeature workpiece in real time. The method can further include determining a number of pulses of the laser beam and/or an elapsed time to form the aperture and controlling the laser beam based on the determined number of pulses and/or the determined elapsed time to form a second aperture in the microfeature workpiece.

Abstract: A machine tool for machining workpieces comprising a support structure, a punching device mounted on the support structure, and a laser machining device mounted on the support structure. The machine tool includes a suspension device provided between the punching device and the laser machining device to reduce the laser machining device from being stimulated to move unintentionally due to the operation of the punching device. The suspension device has a spring rate which can be adjusted by a laser positioning device. The laser positioning device can move the laser machining device relative to the workpiece into a functional position and also into a position remote from the functional position. The spring rate of the suspension device is adjusted such that the functional position of the laser machining device is assigned a higher spring rate than that assigned to the position of the laser machining device remote from the functional position.

Abstract: A laser cutting and engraving machine with a fire safety mechanism, comprising a machine body, a laser engraving mechanism provided in the machine body, and a work platform. The laser engraving mechanism is mounted on a work track and is movable along the work track to cut or engrave a workpiece provided on the work platform. The fire safety mechanism is provided in the machine body. The fire safety mechanism comprises a fire source sensing unit, a fire extinguishing unit, and a control unit, in which the control unit is electrically connected to the fire source sensing unit and the fire extinguishing unit, and it receives and processes a signal delivered from the fire source sensing unit to determine if the machine body is ignited and thereby controlling the activation of the fire extinguishing unit.

Abstract: The present invention relates to a lithium secondary battery, and more specifically to a lithium secondary battery having a multi-directional lead-tab structure. The lithium secondary battery of the present invention includes: an electrode assembly which is formed by alternately laminating an electrode plate having a current collector, an active material, and a tab, and an isolation layer; a lead which is electrically connected to the tab; and a battery case, wherein the lead is divided into an anode lead and a cathode lead, and at least two or more anode leads and cathode leads are provided. The battery of the present invention uses the same lead-tab size as the prior art and is suitable for use with high current.

Abstract: An apparatus for treating a surface of a strip casting twin roll includes: a laser machining unit configured to form dimple patterns on a surface of a rotating casting roll using a laser; a machining region processing unit, wherein if the casting roll is rotated by a critical angle, the machining region processing unit calculates a size and a position of a machining region, in which a dimple pattern will be formed, based on image information obtained by imaging the machining region; and a laser beam absorbing unit, wherein if the size of the machining region is smaller than a size of the dimple pattern, the laser beam absorbing unit places a screen at an overlap start position from which the machining region and the dimple pattern start to overlap each other, so as to absorb a laser beam emitted toward a peripheral region of the machining region.

Abstract: A laser processing machine employs a step of forming a pierced hole at a sheet material portion on an inner or outer side of a closed route when a processing to form a hole in the sheet material by cutting along a closed route is carried out. Following this pierced hole a step to perform a cutting process to cut to a predetermined position with a center of the laser beam traversing the closed route and a step of returning, in a condition in which laser irradiation is interrupted, a position of the laser processing head relative to the sheet material to assume a start position lying on the route during a step of cutting to the predetermined position and on the closed route are employed. Thereafter, a step of performing the cutting process from the start position along the closed route is carried out.

Abstract: An additive manufacturing process is monitored, in situ, using optical emission spectroscopy to analyze the composition, phase transformation or manufacturing defects. The system or method may include an analysis of contours of the plasma line intensity, or pre-processing of the plasma spectral line including signal-to-noise ratio analysis, baseline removal, line identification, line de-convolution and fitting. Improvements may additionally involve consideration of plasma parameters such as plasma spectral line intensity, line ratio, plasma temperature and electron density using high-resolution optical emission spectroscopy in both visible and ultraviolet regions. Parameters of the plasma may be determined using an intensity ratio of the ions or atoms emission lines, a FWHM of the line profile for electron density estimation, or a Boltzmann plot for plasma temperature estimation. One or more techniques may be used to monitor when there is a lack of deposition.