1028 results about "Laser beam welding" patented technology

A method of weld repairing an air-cooled aft frame of a transition piece of a gas turbine engine. The transition piece has an interior surface coated with a ceramic coating. The aft frame has a surface with cooling holes therein and from which cracks have propagated. The method includes removing the transition piece from the engine and, without removing the ceramic coating or the aft frame from the transition piece, weld repairing the cracks by performing a laser beam welding technique that deposits a filler material on the surface but does not close the cooling holes in the surface. The surface of the aft frame can be machined to remove excess filler material prior to re-installing the transition piece in a gas turbine engine.

A method is provided for repairing degraded and/or eroded areas on gas turbine blades and vanes. The method is directed to turbine blades and vanes made of advanced superalloy materials with high elevated-temperature properties. The method uses multiple laser beams to perform steps of preheating the repair area, welding the repair area, and post-welding heating of the repaired area. The method uses an array of two or more lasers to perform the steps of heating, welding, and post-weld heat treatment in nearly simultaneous operation thereby dramatically reducing or eliminating the hot cracking associated with other welding methods used with superalloy materials. The method is further directed to cladding or material buildup of degraded turbine blades where the weld material is the same as the matrix or better superalloy materials.

A system and method for laser beam welding at least two adjacent superalloy components involves substantially simultaneous formation of a base weld with a first filler metal placed between the components and cap weld with second filler metal formed over the base weld. A shim is inserted between the components, which may optionally be formed with a groove along the joint surface. A filler wire is fed to a location over the given surface or within the optional groove. Two lasers or a laser and coupled beam splitter supply first and second laser beams that are applied at focal points separated by a predetermined distance (e.g., 0.05-1.5 cm). The first laser beam is used to form a base weld with the first filler metal between the components, and the second laser beam is used to form a cap weld with the second filler metal on top of the base weld.

A method of laser beam welding at least two adjacent superalloy components includes (a) aligning the components along a pair of faying surfaces but without a backing plate; (b) placing a superalloy shim between the faying surfaces; (c) welding the components together using a laser beam causing portions of the superalloy components along the faying surfaces to mix with the superalloy shim; and cooling the components to yield a butt weld between the components.

A laser welding apparatus and method reduce the effect of the fume resulting from a weld. An air injecting nozzle is installed at a laser processing head. The injecting direction of air from the air injecting nozzle is set such that the air flows across a laser beam irradiated from the laser processing head while the air flow avoids direct contact with the laser irradiating point on the work piece.

The invention relates to a laser welding work table, which comprises a pedestal (31) and a positioning seat (14), a drive unit (34) and a hold-down gear (35) which are fixed on the pedestal (31), wherein the positioning seat (14) is provided with a central hole (32) in which an apical ring (13) is arranged; the edge of the central hole (32) is also provided with a plurality of hold-down mechanisms (33) which can press and fix workpieces into the central hole (32); the drive unit (34) can drive the positioning seat (14) to rotate around the center of the central hole (32) of the positioning seat (14), so as to drive the workpieces to be welded to rotate around the center of the positioning seat (14); and the hold-down gear (35) is arranged on the positioning seat (14) and can press down upper surfaces of the workpieces and simultaneously rotate along with the workpieces. The laser welding work table can accurately fix and position the workpieces, can make the workpieces rotate around the center, is convenient to realize high-efficiency laser welding, realizes water circulating cooling of the positioning seat, prevents the workpieces from being heated and deformed, is provided with a swivel base so as to be capable of adjusting the angle of the swivel base and a bottom plate, and is convenient to obtain best laser welding effect.

A superalloy substrate, such as a turbine blade or vane, is fabricated or repaired by laser beam welding to clad one or more layers on the substrate. Laser optical energy is transferred to the welding filler material and underlying substrate to assure filler melting and adequate substrate surface wetting for good fusion. Energy transfer is maintained below a level that jeopardizes substrate thermal degradation. Optical energy transfer to the filler and substrate is maintained uniformly as the laser beam and substrate are moved relative to each other along a translation path by varying the energy transfer rate to compensate for localized substrate topology variations.

The invention discloses a clamp for battery laser welding. The clamp comprises a positioning jig and a clamp body. The positioning jig hollowly forms positioning grooves and clamping positions, wherein the positioning grooves are used for containing battery cores, one end of each positioning groove is opened, and each clamping position is located on the opened side of the corresponding positioning groove and used for containing PCM boards. The clamp body comprises compressing positioning assemblies, a fixing plate, a positioning base, linear driving devices and a mounting plate, wherein the positioning base, the linear driving devices and the mounting plate are fixedly connected with a laser-beam welding machine. The positioning base is provided with a positioning interval used for containing a positioning jig, and the linear driving devices are located between the positioning base and the mounting plate and are provided with output ends which slide up and down. The fixing plate is fixed at the upper end of the mounting plate. Each compressing positioning assembly comprises a mounting base, an elastic piece and a pressing pawl. The mounting bases are arranged on the mounting plate in an up-down sliding mode, the elastic pieces are arranged between the mounting base and the fixing plate, and the pressing pawls are mounted on the mounting base and are provided with butting parts with through holes. In the compressing process of the clamp, only the linear sliding movement is made, positioning is accurate, welding quality and final product performance can be improved, the clamp is divided into two parts, and thus operation is made easier.

The invention discloses an active agent and a method for carrying out surface treatment on materials to be welded of aluminium and aluminium alloys so as to improve the energy utilization rate of the aluminium and the aluminium alloys, deepen the fusion depth of welding seams and further obtain higher welding quality. The active agent for laser welding consists of a chloride and a fluoride, wherein the mass ratio of the chloride to the fluoride is (1-2): (1-4); the chloride is at least one of lithium chloride, sodium chloride, potassium chloride, zinc chloride, magnesium chloride, aluminium chloride, calcium chloride or tin chloride; and the fluoride is at least one of lithium fluoride, sodium fluoride, magnesium fluoride or calcium fluoride. When the surface treatment is carried out, firstly the fluoride and the chloride are mixed fully and uniformly, water is added to form a supersaturated solution, then the supersaturated solution is coated on the surface of a welded test piece as a coating agent, then drying is carried out, and finally laser welding is carried out under the condition of gas protection.

The present invention relates to a method for interconnecting adjacent expandable pipes by Laser Beam Welding (LBW).

Superalloy components, such as service-degraded turbine blades and vanes, are clad by laser beam welding. The welding/cladding path, including cladding application profile, is determined by prior, preferably real time, non-contact 3D dimensional scanning of the component and comparison of the acquired dimensional scan data with specification dimensional data for the component. A welding path for cladding the scanned component to conform its dimensions to the specification dimensional data is determined. The laser welding apparatus, preferably in cooperation with a cladding filler material distribution apparatus, executes the welding path to apply the desired cladding profile. In some embodiments a post-weld non-contact 3D dimensional scan of the welded component is performed and the post-weld scan dimensional data are compared with the specification dimensional data. Preferably the welding path and/or cladding profile application are modified in a feedback loop with the pre- and/or post-welding 3D dimensional scanning.

A new packaging method for a wide range of MEMS for application on both the wafer and device scale. Titanium is used as the packaging material and both silicon and titanium MEMS devices are integrated on to a titanium substrate. A Nd:YAG pulsed laser is used to micro-weld the titanium cap to the substrate. A three-dimensional time dependent model of heat flow during laser beam welding is presented. The heat transfer and parametric design capabilities of COMSOL were employed for this purpose. Model calculations are compared and calibrated with experimental results of pulsed laser welds. The functionality and hermiticity of the proposed packaging was evaluated by packaging a self actuated Veeco Instrument AFM cantilever tip. The experimental measurements show that the resonance frequency and quality factor of the device stay the same before and after packaging and the applied technique has no effect on the device.

The present invention relates to material engineering technology, and is one laser-TIG welding method for magnesium alloy shapes and castings. The laser-TIG welding process combines two kinds of welding techniques, laser welding and TIG welding, and provides the organic matching of two kinds of heat source powers. The laser-TIG welding process is superior to available welding processes in that it can obtain magnesium alloy joint with high welding quality and good shape, jointing strength reaching 95 % of mother material strength, high production efficiency and saving in energy source.

Disclosed is an electric-arc-assisted laser welding-brazing method applicable to dissimilar material butt connection. The method is used for implementing high-quality connection between aluminum/steel dissimilar materials. The method comprises the steps that first, acetone is used for cleaning welded sheets to remove oil stains on the surfaces of the welded sheets, and oxide films on the surface of the aluminum or aluminum alloy sheet through a mechanical abrading method; second, the aluminum or aluminum alloy sheet and the steel sheet are fixed to a welding jig with a forming groove in a butt connection mode, and a connector is made to be located above the forming groove; third, acetone is added in a fluxing agent and evenly-mixed filling powder respectively, and the surface of an aluminum or aluminum alloy welding bead is coated with the mixture formed by the filling agent and acetone and the mixture formed by the filling powder and acetone in sequence after the mixtures are stirred; fourth, a laser beam and an assist electric arc behind the laser beam keep synchronous movement to carry out welding.

An electrical connection inside a semiconductor device is established by lead frames formed of plural conductor plates. The lead frames are disposed three-dimensionally so that the respective weld parts thereof are exposed toward a laser light source used in the laser welding. The laser welding is then performed by irradiating a laser beam. According to the above, welding can be performed readily in a reliable manner. The productivity of the semiconductor device and the manufacturing method of the semiconductor device can be thus enhanced. In addition, because the lead frames have the cooling effect, they have the capability of a heat spreader. It is thus possible to provide a semiconductor device and a manufacturing method of the semiconductor device with high productivity.

The invention relates to a double laser beam welding method for a T-shaped joint. The method comprises the step of continuously welding the whole T-shaped joint by using the double laser beams and is characterized by also comprising the position welding step before the continuously welding step, wherein in the position welding step, two joint seams of the T-shaped joint are subjected to tack welding by the double laser beams, so that positioning welding joints are formed on at least one of the two joint seams at intervals and the welding deformation of the T-shaped joint is reduced. Compared with the welding method which does not adopt the position welding step before the step of synchronously and continuously welding on two sides of the double laser beams, the double laser beam welding method for the T-shaped joint has the advantages of reducing welding deformation caused by synchronously and continuously welding on two sides of the double laser beams to the maximum degree and guaranteeing the accuracy of the welding route in the process of synchronously and continuously welding on two sides of the double laser beams. By the method, the welding quality is guaranteed; welding deformation is reduced; and production efficiency is improved.

The invention relates to a plasma-side-suction negative pressure device for laser welding. The plasma-side-suction negative pressure device can be mounted on any laser welding gun head. A negative pressure chamber device is fixed with the laser welding gun head and can move relative to a workpiece to be welded; and the negative pressure chamber device is arranged above a welding puddle area on the surface of the workpiece to be welded and is used for quickly exhausting, so that local negative pressure lower than the normal atmospheric pressure is generated in a closed chamber fixed in the laser welding gun head, and a negative pressure environment can be formed around a welding puddle. With the adoption of the plasma-side-suction negative pressure device for laser welding, the plasma generation during the process of high-power laser deep penetration welding can be effectively inhibited, and the weld-seam deep-layer air holes caused by a keyhole effect are eliminated. The plasma-side-suction negative pressure device for laser welding has the advantages of no restriction of workpiece size, flexibility and convenience in use, good stability, higher welding quality and increased stability in a welding process.

In a spark plug for an internal combustion engine, a noble metal chip such as an iridium alloy chip is bonded on the tip of a center electrode made of a material such as nickel by laser beam welding. The noble metal chip contains another noble metal such as rhodium having a melting point lower than that of the noble metal chip. By laser welding, a molten bond containing the noble metal melted thereinto from the noble metal chip is formed at the junction of the noble metal chip and the center electrode. Alternatively, the noble metal to be melted into the molten bond may be supplied by a separate noble metal plate. The molten bond thus made has a high bonding strength and a small thermal stress, and thereby durability of the spark plug is improved.

The invention relates to a laser welding device and aims to solve the problem that welding air holes are apt to be generated in laser welding of a metal material and the problem that welding by a vacuum electron beam causes X-ray pollution and limits the structure and size of weld joints to a certain degree. The invention adopts a scheme I that a laser beam welding gun head is in closed connected with both a first through hole and a focusing lens, a scheme II that a reflective focusing laser beam welding gun head is in sealed connection with both a first through hole and a flattening lens and is arranged relative to a laser arranged outside a vacuum room, and a scheme III that a laser beam welding gun head is connected with a laser, arranged relative to a worktable below and fixed on an arm of a welding robot arranged in an vacuum room. The device is used for laser welding.

The invention discloses a laser welding method for lapping galvanized steel sheets, which comprises: placing a Al-Sn alloy foil containing 35 to 45 weight percent of Sn between faying surfaces of the steel sheets; and utilizing two laser beams of which the power is respectively from 2 to 3KW and from 3 to 4KW to weld welding seams, wherein the space of the laser beams is between 20 and 50mm and the welding speed is between 4 and 8m/min. The method has low production cost and stable welding quality; and the strength of the obtained welding seams is greater than that of base metal, no welding spatter exists on the surface, and the corrosion resistance of the welding seams is more than three times higher than that of by a sweeping-out method. The method can be used for laser welding of lapped welding seams of DP series, TRIP series and HSLA series hot galvanized steel sheets, and realizes high efficiency, low pollution and low waste material of welding production.