55 results about "Melt depth" patented technology

The invention relates to the technical field of laser welding, and discloses a laser welding method for accurately controlling weld penetration. According to the invention, through fusion of coaxial multispectral sensing and a back monitoring unit, multi-dimensional information synchronous acquisition of weld front molten pool morphology, a temperature field and a back thermal radiation signal is realized, and limitation of single sensing is overcome; furthermore, a dynamic instruction is generated based on the extracted multi-characteristic parameters and an adaptive fuzzy PID algorithm, thereby realizing precise closed-loop control of laser energy and heat input, and improving real-time performance and robustness of control. Particularly, a digital twin model is introduced to carry out forward prediction, cross validation is carried out with back monitoring signals, a triggered lead compensation mechanism effectively overcomes hysteresis of traditional feedback control, finally, precision control and stable forming of weld penetration are achieved, the defects of incomplete penetration, burnthrough and the like are effectively avoided, and the welding quality is improved. And the device is particularly suitable for occasions with extremely high welding quality requirements.

The invention relates to the technical field of laser-electric arc hybrid welding, and discloses a laser-electric arc hybrid welding method and system. According to the method, molten pool vision, plasma spectrum, electric signals and temperature field data are collected in real time through multi-modal sensing, and after depth features are extracted and fused, a quality evaluation model based on Stacking ensemble learning is used for recognizing weld defects and confidence in real time; and when the confidence coefficient is insufficient or a defect tendency is detected, triggering a parameter decision optimized by multiple targets such as fusion depth, strength and the like, generating an adjustment instruction set, and executing dynamic fine adjustment after verification of a process knowledge base. The system correspondingly comprises a pose deviation compensation module, an online quality evaluation module, an optimization decision module, a strategy verification module and a parameter execution module. Intelligent sensing and self-adaptive accurate control in the welding process are achieved, and the welding quality stability and the defect suppression capacity are effectively improved.

The invention relates to a method for determining a welding penetration depth of a welding process, in particular a laser welding process, comprising the following method steps: a. carrying out a set-up process, wherein, in the set-up process, a predefined welding process is carried out and information relating to a vapour capillary (100) is determined, b. determining a measurement geometry (200, 202, 204) taking into account the information relating to the vapour capillary (100), c. carrying out a productive process, wherein the predefined welding process is carried out and a welding penetration depth is determined on the basis of measurements of the vapour capillary (100) which are carried out using the measurement geometry (200, 202, 204).

The invention belongs to the technical field of aerospace structural part welding and manufacturing, and particularly relates to a laser-electric arc hybrid welding method for a high-strength aluminum alloy cabin section. According to the method, a high stress concentration area and a deformation risk area are identified through pre-welding modeling and heat-force coupling simulation, then the laser and electric arc energy ratio is dynamically matched based on a heat input cooperation coefficient eta, and the welding speed and the laser defocusing amount are regulated and controlled in real time in combination with a weld joint forming stability index sigma calculated through a pre-trained LSTM model. And performing fusion depth compensation on the special area through the dynamic arc compensation factor phi, and finally optimizing the performance of the joint through postweld heat treatment. The method can adaptively cope with complex working conditions such as plate thickness fluctuation and track curvature change, defects such as air holes and hot cracks are effectively restrained, the internal defect rate of a welding seam is lower than 0.5%, the tensile strength of a welding joint reaches 90% or above of that of a base material, the method is adaptive to 2-series and 7-series high-strength aluminum alloy and complex welding seam tracks, and the welding quality is improved. And the harsh requirements of high reliability and long service life of aerospace structural parts are met.

The utility model provides a welding device and a welding system, and belongs to the technical field of batteries. The welding device comprises a base part and a pressing head assembly. The base part is used for supporting a first to-be-welded part and a second to-be-welded part which are stacked, and the second to-be-welded part is located above the first to-be-welded part; the pressure head assembly comprises a sleeve piece, a lens piece and a negative pressure pipeline; the sleeve part is located above the base part, and a welding opening in the bottom end of the sleeve part abuts against the top face of a second to-be-welded part in a sealed mode. The lens part is embedded in the sleeve part, and the lens part is used for transmitting the laser beam so that the laser beam can irradiate a second to-be-welded part in the welding opening; the negative pressure pipeline is connected with the sleeve piece and used for vacuumizing the interior of the sleeve piece. According to the welding device, slag splashing and weld joint air holes can be reduced, the fusion depth can be greatly increased, the required fusion depth can be achieved with low laser power, and therefore heat input generated during laser welding is greatly reduced, and the welding cost is reduced.

The invention discloses a laser cladding process method for improving hardness, wear resistance and metallurgical bonding strength based on an S element, and belongs to the technical field of metal material surface modification. In the laser cladding process, the S-containing element powder is added into the mixed powder, so that the flowing mode of a molten pool is fundamentally converted, the phenomenon that the molten pool faces downwards is generated through the Malangori effect, the fusion depth of the molten pool is increased through the phenomenon, the bonding area of a cladding layer and a base body is increased, and the metallurgical bonding strength is enhanced; due to the fact that strong convection is generated in the molten pool, grains in the molten pool are refined, a fine hard phase is formed, the abrasion resistance and hardness of a cladding layer are enhanced, the service life of the cladding layer is prolonged, and the method is suitable for the field of remanufacturing and surface strengthening of industrial parts with extremely high requirements for surface abrasion resistance, impact resistance and coating bonding strength.

The present application relates to the technical field of electron beam welding, in particular to a tube sheet welding tool and a welding method, the welding tool comprises an inner support, a backing ring and a heat dissipation assembly, the inner support supports the pipe opening of the connecting pipe, so that the pipe opening of the connecting pipe is not prone to collapse during the welding process, the backing ring is supported on the side of the tube sheet away from the to-be-welded part to block and dissipate heat on the back side of the weld, so as to avoid melting through on the back side of the weld, and the control of the weld width and the penetration depth is realized, at the same time, the heat dissipation assembly is attached to the side of the backing ring away from the to-be-welded part to dissipate heat on the back side of the weld, so as to avoid the deformation of the tube sheet during the welding process, the cooperation of various structures ensures the welding quality and improves the fusion rate; the tube sheet welding method adopts the above welding tool and adopts the welding sequence of spot welding, pre-welding and formal welding, so as to avoid the collapse of the pipe opening of the connecting pipe during the welding process, and the weld width and the penetration depth are easy to control, and the welding quality and the fusion rate can be effectively improved.

A laser welding method for a stagnation shield and a turbine blade for improving a weld quality. The laser welding method includes laying a welding wire along a gap between the stagnation shield and the turbine blade; melting the welding wire using a laser having a laser incidence angle of 30° to 70°; and forming a weld having a weld penetration depth of less than 200 micrometers by one welding pass or two welding passes.

The application discloses a laser welding method of a laminated workpiece, and belongs to the field of laser welding. The laser welding method of the laminated workpiece comprises the following steps: laminating two or more workpieces to form a laminated workpiece; scanning a welding path on the surface of the laminated workpiece by using a laser beam with a ring-shaped light spot; the welding path comprises a spiral line and a circular outermost circle; the circular outermost circle adopts a sine swing form; a weld is formed along with the movement of the laser beam; and the upper surface of the weld and the lower surface of the weld are remelted by using laser heat conduction welding. The laser welding method provided by the application is characterized in that the spiral line in the inner layer of the welding path is used for providing a fusion depth and reducing heat input, the outer layer adopts a circular form with a sine swing, which is used for avoiding the appearance of a welding bump and increasing the fluidity of a molten pool, so as to reduce pores in the weld; the upper surface and the lower surface of the weld are remelted, which is used for repairing the quality of the surface of the weld and promoting the release of hydrogen, and the mechanical properties of the weld are improved.

The present application relates to the technical field of metal material welding, and particularly relates to a double-beam laser welding method, which comprises the following steps: double-beam laser welding is carried out by using double laser heads; the upper laser head is inclined to the welding direction, and the inclination angle between the upper laser head and the vertical line of the surface of the welding plate is 3-6 degrees, and the laser defocusing amount is -2mm to -5mm; the lower laser head is inclined to the welding direction by 3-6 degrees, and the inclination angle of the lower laser head is greater than that of the upper laser head, and the laser defocusing amount is -2mm to +2mm; the distance between the focal points of the upper and lower laser heads in the horizontal direction is kept between 0.5mm and 1.0mm; the laser welding power is adjusted to carry out welding, the welding penetration of the upper laser head reaches 0.7t or above, and the welding penetration of the lower laser head reaches 0.3t-0.6t, and t is the plate thickness; the present application solves the problems of high reflection and porosity in the laser welding of aluminum or aluminum alloy, and effectively controls the molten pool solidification and laser high reflection in the welding process through the upper and lower double-beam welding.

The application discloses a cold plate production method with an intermediate layer, comprising single-piece punch forming of an upper plate and a lower plate, and inlet and outlet water port processing; the upper and lower plate materials are selected from 5 series aluminum alloys with good strength and welding performance, such as 5754, 5083, 5182 and the like; a tool is used to fix the intermediate layer on a flat plate; point gluing fixation or lashing or spraying can be used to combine the intermediate layer with the flat plate; the intermediate layer is made of 4 series aluminum alloys, such as 4045 and 4047, and the thickness is between 0.1 mm and 0.2 mm; the lower plate is assembled above the intermediate layer; laser welding is performed along the track of the intermediate layer; due to the high penetration of laser energy, the thickness of the lower plate is less than or equal to the thickness of the upper plate; in order to ensure the flatness and welding strength of the upper plate after welding, the laser welding penetration depth is greater than or equal to 0.25 mm, and the welding width is greater than or equal to 1.2 mm; the application has the advantages of simple process, reduced production cost, reduced flatness requirement between the flat plate and the stamping plate after adding the intermediate layer, reduced processing difficulty and improved product yield.

The application discloses a coaxial composite laser welding method and a welding method of a flat wire motor winding, relates to the technical field of laser welding, and adopts a coaxial composite laser beam to act on the surface of high-reflectivity material to form a welding molten pool. The coaxial composite laser beam comprises an outer ring laser beam and a core laser beam. The outer ring laser beam is a pulse laser beam, and the core laser beam is a continuous laser beam. The continuous laser beam forms a main molten pool, and the pulse laser beam forms an auxiliary molten pool. The main molten pool and the auxiliary molten pool have an overlapping portion. The application combines the continuous laser and the pulse laser, the main molten pool formed by the continuous laser is in overlapping communication with the auxiliary molten pool formed by the pulse laser, the pulse laser forms disturbance to the molten metal in the auxiliary molten pool, drives the molten metal in the main molten pool to have an oscillation stirring effect, can increase the laser energy absorption efficiency of the high-reflectivity material, improves the welding penetration, can optimize the energy distribution of a heat source by adjusting the energy proportion and the focus point position, accurately controls the energy state of the heat source, and realizes zero spatter.

This invention relates to the field of intelligent welding control technology, and discloses an intelligent welding control system for precast box girder frames, including an alternating magnetic field module, a laser excitation module, an interference receiving module, a phase-locked extraction module, and a main control module. The alternating magnetic field module generates a magnetic field in the molten pool region and outputs a reference signal, driving micro-oscillations at the solid-liquid interface; the laser excitation module excites ultrasonic waves, and the interference receiving module converts the ultrasonic echoes carrying oscillation characteristics into voltage signals; the phase-locked extraction module uses the reference signal for phase-locked demodulation to extract time-of-flight data; the main control module combines this data with a sound velocity distribution model to calculate the actual weld depth. This invention filters out environmental interference through phase-locked demodulation, improves calculation accuracy through sound velocity compensation, and adjusts the alternating magnetic field to generate electromagnetic lifting force when there is a risk of burn-through, achieving closed-loop intervention and preventing welding defects.

An apparatus for predicting weld quality includes an image sensor acquiring an image of a welding portion of a workpiece, a storage storing a shape detection model, a depth prediction model and a strength prediction model, and a controller configured to acquire shapes of a melt pool and a keyhole by receiving the image and inputting the image to the shape detection model, acquire a penetration depth of the keyhole by inputting the shapes of the melt pool and the keyhole to the depth prediction model, and acquire a tensile strength by inputting one of the shape of the melt pool, the shape of the keyhole and the shapes of the melt pool and the keyhole and the penetration depth of the keyhole to the strength prediction model. The weld quality of all products may be predicted during a welding process.

The present application relates to the technical field of welding process, disclose a kind of laser electric arc composite welding weld penetration control method and system, the method includes: based on the infrared thermal radiation signal of welding pool constructs pool three-dimensional temperature field;Based on the specific element spectral line intensity of the plasma optical spectrum signal in the welding pool, the pool metal vapor concentration is calibrated;The pool three-dimensional temperature field and the pool metal vapor concentration are coupled analysis, and the pool state characteristics of the welding pool are obtained;Based on the pool state characteristics dynamic division laser-arc energy distribution ratio;Based on the laser-arc energy distribution ratio, the offset position of laser focal point in weld depth direction is adjusted, and the arc voltage waveform is adjusted by inverter power supply;The present application can improve the efficiency of a kind of laser electric arc composite welding weld penetration control.

This welding current waveform modification method comprises at least a first step and a second step. In the first step, a basic waveform of a welding current Aw is prepared. In the second step, the basic waveform is modified to a welding current waveform having a different waveform pattern, in accordance with the plate thickness of a base material 200, which is an object to be welded, the penetration depth, or the penetration ratio.

The invention relates to a process window screening method for nickel-based high-temperature alloy single crystal preparation. According to the method, based on a double-ellipsoid molten pool analysis heat source model and solidification condition calculation, the geometrical morphology and solidification behavior of the molten pool caused by electron beam scanning can be simulated in a multi-parameter space in a high-flux mode. The grain orientation evolution trend of the material after the powder bed is molten can be accurately predicted by calculating parameters such as the penetration depth, the penetration width, the molten pool leading edge angle and the temperature gradient under different energy input conditions, and a single crystal forming window suitable for the nickel-based superalloy is constructed. By adopting the method, process parameters such as energy input, scanning speed, scanning strategy and the like can be screened and optimized, and a multi-dimensional process window is established so as to identify stable growth conditions required by single crystal preparation. According to the method, the internal relation between the geometric behavior of the molten pool and the preferred orientation of the crystal grains can be disclosed, and technical support is provided for realizing controllable forming of a single-crystal structure, reducing the defect generation risk and improving the structural integrity and performance of an additive manufacturing part.

The invention belongs to the technical field of welding, and particularly relates to a welding method for a super invar alloy workpiece. The welding method of the super invar alloy workpiece comprises the steps that first butt joint faces of two adjacent bottom plates are in butt joint to form a first seam; the bottom plate is provided with a first side and a second side which are arranged oppositely in the thickness direction of the bottom plate, and the first seam is welded from the first side through laser welding to form a first welding seam; wherein the parameters of laser welding for welding the first joint are as follows: the laser power is 5.6 KW to 6.0 KW, the speed is 1.8 m / min to 2.0 m / min, the defocusing amount is + 3 mm to + 6 mm, and the fusion depth is 5 mm. According to the welding method for the super invar alloy workpiece, the welding quality can be guaranteed.

This invention discloses a laser welding method for quartz glass and an atomic gas chamber, belonging to the field of atomic gas chamber encapsulation technology. The method involves butt-joining first and second quartz glass components to form a bonding interface, and then welding using a CO2 laser beam, divided into two steps: pre-welding and main welding. During pre-welding, a first laser power scan is used to form multiple discrete weld points to fix the components; during main welding, a higher second laser power is used for continuous scanning to form a sealing weld. The spacing between adjacent weld points formed in the pre-welding is less than 1.5 times the diameter of the main welding spot, ensuring that the main weld completely covers and fuses the discrete points, guaranteeing a continuous and uniform weld. By controlling the laser power and scanning speed, the weld penetration depth is stabilized at 0.5 mm to 2 mm, with an airtightness better than 8×10⁻⁶ mm. ‑11 Pa·m³ / s, with a heat-affected zone width of less than 1.5 mm. This invention also discloses an atomic gas chamber prepared using this method, which can avoid component displacement and stress concentration, achieve high airtightness and low heat-affected zone sealing welding, and improve the long-term stability of the atomic gas chamber.

The present application relates to the technical field of pipe laser welding, and particularly relates to a large-diameter thin-wall steel pipe welding method based on laser, which comprises the following steps: performing roundness correction on a large-diameter thin-wall steel pipe to be welded which has a circumferential continuous and symmetrical elliptical deformation after long-distance horizontal transportation; controlling a laser welding gun to move along the circumferential weld joint of the large-diameter thin-wall steel pipe to be welded; when it is determined that there is an abnormal risk in the welding of the large-diameter thin-wall steel pipe according to a molten pool shape representation value, determining a welding inspection strategy for the large-diameter thin-wall steel pipe according to a distance fluctuation representation value; when the first welding inspection strategy is adopted, determining whether the welding of the large-diameter thin-wall steel pipe meets the standard according to a radial vibration peak acceleration; when the second welding inspection strategy is adopted, determining whether the welding of the large-diameter thin-wall steel pipe meets the standard according to a molten depth fluctuation standard deviation; and continuing to weld the large-diameter thin-wall steel pipe which meets the preset standard until the welding of the whole ring joint is completed. The present application improves the laser welding efficiency of the large-diameter thin-wall steel pipe.

This invention discloses a method for preparing a B4C-reinforced CoCrFeNiTi high-entropy alloy composite coating. The method includes the following steps: spraying and remelting unmixed B4C CoCrFeNiTi powder onto a 45 steel substrate; adjusting the argon flow rate and power during laser cladding and remelting until no black material accumulation areas are found at the edge and bottom of the molten pool, and simultaneously achieving a pot-bottom shaped interface between the coating and the substrate with a melting depth of 380-400 μm, thus obtaining laser cladding and remelting parameters; preparing a mixed powder by proportionally configuring Ni-B4C powder and CoCrFeNiTi powder, wherein B4C powder accounts for 4-8% of the mixed powder mass; plasma spraying the mixed powder onto the pretreated 45 steel substrate; and remelting the mixture according to the aforementioned laser cladding and remelting parameters to obtain the B4C-reinforced CoCrFeNiTi high-entropy alloy composite coating. In this invention, the hardness of the remelted layer is not less than 751 HV, and the wear volume is not greater than 0.874 × 10⁻⁶. 6 μm 3 .

1. The name of the design product: test system host (OCT). 2. The use of the design product: host used for weld tracking, process monitoring, real-time penetration detection, real-time quality detection in laser welding. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The application provides a laser spiral spot welding method, which comprises the following steps: setting a spiral line track; starting from the center point of the spiral line track, performing phased scanning according to the spiral line track, so that the laser beam output by the laser performs spiral spot welding on the workpiece according to the spiral line track to form different scanning tracks, and the laser power used is different when performing scanning in each phase. The application completes spiral spot welding by using different laser powers in four phases in a way of overall nonlinearly reducing the laser power, and a weld with a peripheral shallow part, a central deep part and a uniform transition of the penetration depth is obtained, and the cracking tendency of the workpiece is reduced.

The application discloses a kind of multi-strand wire laser welding equipment and welding method thereof, it is related to multi-strand wire laser welding equipment technical field, equipment includes mutually nested wire, for driving wire rotation rotating device, and for emitting laser energy to the bonding surface between adjacent wire laser device;Method includes: control rotating device drive multi-strand wire synchronous rotation, and control laser device to the bonding surface between multi-strand wire is periodically irradiated annular, so that laser energy is circumferentially applied to the bonding surface between two adjacent multi-strand wire, and forms the molten pool of welding adjacent two multi-strand wire at bonding surface;In single irradiation cycle, laser energy output by laser device increases from initial value to peak value according to preset function curve and then decreases;The technical scheme provided by the application can solve the problem that the melting depth is inconsistent, the welding point is embrittled and the interlayer bonding force is insufficient due to uneven heat accumulation between multi-strand wire in traditional welding.

The present application relates to the field of additive manufacturing, and discloses a directed energy deposition processing system and an online closed-loop control method. The processing system integrates an OCT measurement unit and a ring-shaped VCSEL auxiliary heating unit. The OCT performs high-time-resolution sampling on the molten pool area. A controller extracts a molten depth characteristic quantity from the measurement signal and compares it with a preset stable range to adjust the VCSEL output power. When stable, the baseline power is maintained, and when abnormal, the adjustment strategy of power increase or power decrease / shut down is executed, thereby forming an online closed-loop control. The ring-shaped VCSEL forms a ring-shaped heating area around the main processing area, and a low irradiation area is arranged to reduce the influence on the nozzle structure and the main melting process, realize the follow-up reshaping of the local thermal history, and thus improve the deposition process stability and forming consistency, reduce the defect risk, and improve the engineering implementability.

The invention discloses an automatic adjusting method for OCT penetration detection light beams and a galvanometer scanning laser welding method, and belongs to the technical field of laser machining, the coordinate position of each welding spot is determined according to the welding seam track and the machining track of a workpiece to be welded, the tangent function of each welding spot on the machining track is determined according to the coordinate position, and on this basis, the welding spot depth is automatically adjusted. And detecting light coordinates relative to each welding spot in the movement direction of the processing light beam are determined, so that the movement track and the track function of the detecting light beam are determined, and the automatic adjustment of the OCT penetration detecting light beam is further realized. The automatic adjusting method for the OCT fusion depth detection light beam is simple in step and convenient to use, accurate control over the position of the OCT fusion depth detection light beam can be achieved, it is guaranteed that fusion depth data can be obtained by detection of the detection light beam when all welding spots are machined, the welding seam fusion depth detection accuracy is guaranteed, the welding quality and the welding efficiency of a to-be-welded workpiece are improved, and the working efficiency is improved. And the reject ratio of workpieces is reduced, and good economic benefits are achieved.

The plastic part end face welding process comprises the following steps that an aluminum-plastic combination body is provided, the aluminum-plastic combination body comprises an aluminum plate and a first plastic part, the two ends of the aluminum plate are open, a flow channel is formed in the aluminum plate, the first plastic part is provided with a through groove, and the inner wall of the through groove is fixedly connected with the outer surface of the end of the aluminum plate; a first cavity is formed in one side of the through groove, the first plastic part comprises a first end face, and the first end face is annular; providing a second plastic part; the method has the beneficial effects that the two laser welding machines are used for heating the end faces of the two plastic parts at the same time, the heating time and the melting depth of the end faces are accurately controlled, after heating is stopped, the two end faces are rapidly subjected to butt joint and extrusion fusion, and then connection of the two plastic parts is achieved through pressure maintaining and cooling; the two laser welding machines heat the end faces of the two plastic parts correspondingly, the synchronism of heating and melting of the end faces of the plastic parts is guaranteed, the butt joint accuracy is improved, and therefore the welding quality of the plastic parts is improved.

The present application relates to the technical field of welding, and specifically discloses a SLMed GH3230 lock bottom weld seam optical fiber laser long focal length focal point hole in rotation welding method, which comprises the following steps: pretreating a SLMed GH3230 lock bottom joint to-be-welded part, and clamping and fixing a tool to ensure that the butt joint gap meets the standard; configuring a welding equipment optical assembly, adopting a 330mm focal length focusing field mirror matched with a galvanometer system, and matching a transmission optical fiber and a collimation unit; setting an argon gas protection nozzle with a tail cover and adjusting the spacing to form a welding protection atmosphere; setting welding process parameters, and controlling the laser focal point to rotate at a high speed in a circle in the welding hole through the galvanometer system; welding along the butt joint seam track to ensure that the penetration depth is not less than 4mm, and completing the non-penetration laser tailor welding of the lock bottom joint. The present application effectively suppresses weld cracks, reduces pores, improves surface forming, and is suitable for welding of lock bottom joints of various alloys.

The invention discloses an intelligent laser welding system and method, and belongs to the technical field of laser welding, the intelligent laser welding system comprises a laser processing device, an OCT detection device, a processing head, a moving device and a main controller; measurement light emitted by an OCT detection device and welding laser emitted by a laser processing device are coaxially emitted to a workpiece through a processing head so as to achieve real-time detection of the welding penetration depth, penetration depth data are analyzed through a logic control system, the intervals in which the penetration depth data and a preset threshold value are located are compared in real time, and the real-time detection of the welding penetration depth is achieved. And the coordinates of the insufficient fusion depth area are marked, a repair welding instruction is automatically generated, a repair welding program is called, in-situ repair welding operation is executed under the non-stop condition, and the production efficiency and the product percent of pass are improved.