89 results about "Melt depth" patented technology

The invention relates to the technical field of automatic welding control, and particularly discloses a multi-station automatic welding cooperative control method for electric iron accessories, which realizes full-closed-loop accurate control of a welding process through multi-sensor data fusion and an intelligent optimization algorithm. According to the method, an infrared thermal imager, an acoustic emission sensor and an ultrasonic thickness measuring device are adopted to collect molten pool temperature field, sound wave frequency spectrum and fusion depth data in real time, after feature extraction, the data are input into a multi-target optimization model, and a Pareto optimal solution set is generated with the fusion depth, the width of a heat affected zone and phase change latent heat as optimization targets; dynamically adjusting a segmented welding-back path and process parameters on the basis of an optimization result, and triggering model iterative correction through ultrasonic online monitoring; the central control unit adopts space voxelization monitoring and a three-level collision avoidance strategy to coordinate operation of the multiple mechanical arms, and collision emergency protection is achieved in combination with flexible pressure sensing.

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 ship manufacturing welding, in particular to a large-wall-thickness Al-Mg alloy laser-MIG composite and friction stir welding coupled welding device and method for ships, and the device comprises a sequential system 1, a friction stir welding module 2 and a laser-MIG composite welding module 3; the laser-MIG composite welding module 3 comprises a laser sensing return device 3A, a welding gun swing control device 3B and a laser-MIG composite welding gun 3C; the laser-MIG composite welding gun 3C comprises an MIG welding gun and a laser welding gun, the MIG welding gun and the laser welding gun are coaxially arranged, an optical fiber laser is arranged in the laser-MIG composite welding gun 3C, the optical fiber laser has the functions of laser visual sensing, preheating and post-heating, and the device solves the contradiction between the penetration depth and the defect when a traditional welding method is adopted for the thick plate aluminum alloy for the ship. Axial force needed during friction stir welding can be reduced through laser preheating, the pressure of a main shaft of equipment is remarkably reduced, and the service life of a stirring head is prolonged.

The invention discloses a laser welding method for a copper-aluminum composite material, which comprises the following steps of: performing upsetting thinning treatment on a three-layer sandwich structure base material to ensure that the total thickness of a welding area is 1.5 mm, the thickness of an aluminum layer is 0.9-1.1 mm (the deformation rate is 10-30%), the thickness of a copper layer is 0.2-0.3 mm, the surface roughness Ra is less than or equal to 1.6 mu m, and the surface roughness Ra of an oxide layer is less than or equal to 5 mu m; a 1064nm optical fiber laser is adopted, welding is conducted at the power of 85%-95%, the speed of 120-150 mm / s and the frequency of 4000-6000 Hz, the fusion depth is 0.3-0.6 mm, and the fusion width is 1.2-2.0 mm. By means of the method, the tensile strength of the connector can be larger than or equal to 110 MPa, the resistivity is smaller than or equal to 2.5 * 10 <-8 > omega.m, the problems that traditional welding strength is low and conductivity is poor are solved, batch quality consistency is ensured, and the method is suitable for the fields of new energy automobiles and the like.

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 laser welding, and discloses a thin plate laser lap joint welding method, a laser device and laser welding equipment. The power of the laser acting on the surface of the upper plate and the power of the laser acting on the lower plate are both smaller than the power of the laser acting on the center of the weld joint, the laser power is in a low-high-low change trend in the direction from the upper plate to the center of the weld joint to the lower plate, and it is ensured that the laser in the center of the weld joint can penetrate through the upper plate. Laser on the two sides of the center of the welding seam is controlled in a state of not penetrating through the plate, so that energy input in different subareas of the welding seam is accurately controlled, the controllable and different fusion depths of all the subareas are ensured, the problems that the fusion depths are unstable, the contour of a molten pool is discontinuous and the lower plate is easy to penetrate are solved, the welding seam is good in consistency and free of inward concave or outward convex, and continuous smooth transition is achieved; the size measurement of the molten pool meets the standard requirements, the welding quality and the welding efficiency are effectively improved, welding wires are not needed, and the cost is effectively reduced.

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 invention provides a method for constructing a fusion width prediction model of a laser stitch welding interface. The method comprises the following steps: collecting surface fusion width data and fusion depth data of a plurality of welding seams of laser stitch welding of a first workpiece and a second workpiece which are overlapped with each other, and interface fusion width data at an interface position between the first workpiece and the second workpiece; and constructing a data set by taking the collected surface fusion width data and fusion depth data as input data and taking the interface fusion width data as output data, and training the interface fusion width prediction model by using the data set. According to some embodiments of the invention, a laser stitch welding interface fusion width prediction model can be constructed, so that convenient and non-destructive interface fusion width prediction can be realized by using the prediction model in production, and the evaluation of the laser stitch welding quality is facilitated. The invention further provides a corresponding laser stitch welding interface fusion width prediction method and system, electronic equipment and a computer program product.

The utility model relates to the technical field of metal processing devices, and discloses a rapid alloying device for a metal material surface, which comprises a processing rack, a laser setting assembly and a heating assembly, the processing rack comprises two groups of fixed mounting plates, a transmission assembly is arranged between the two groups of fixed mounting plates, and the laser setting assembly is arranged on the processing rack. And fixed arrangement frames are arranged at the outer ends of the two fixed mounting plates correspondingly, laser arrangement assemblies are arranged at the left ends of the tops of the fixed arrangement frames, and heating assemblies are arranged on the right sides of the laser arrangement assemblies. The all-directional guiding and traction device is arranged to be matched with the transmission assembly to achieve conveying treatment of metal raw materials, the laser treatment devices matched with each other are arranged to conduct laser gas alloying treatment on the metal surface, and the fusion depth of a molten pool and the depth of an alloying layer are increased. The thickness of an alloying layer and the content of alloying elements can be considered at the same time, heating and oxidation treatment are continuously conducted on the alloy layer in cooperation with a subsequent heating device, and the efficiency and quality of metal alloying treatment are guaranteed.

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.

The invention discloses a vacuum laser welding method for a thick plate titanium alloy structural member, and belongs to the technical field of metal member welding. The vacuum laser welding method for the thick plate titanium alloy structural part comprises a top plate assembly assembling step, a first positioning welding step, a second positioning welding step, a first continuous welding step, a top plate assembly and bottom plate pre-welding assembling step, a third positioning welding step, a structural part overturning step, a fourth positioning welding step and a second continuous welding step. And a vacuum laser welding continuous welding step. According to the vacuum laser welding method for the thick plate titanium alloy structural part, the problems that in the atmospheric environment, the laser welding fusion depth is insufficient, the internal quality of a welding seam is poor, the multi-layer and multi-pass welding residual stress is high, and welding deformation is large are solved.

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 application discloses a kind of vacuum laser welding online monitoring methods, it collects the secondary current signal of vacuum laser welding, and analyzes the correlation law of secondary current signal and weld forming, penetration, and then based on secondary current signal, the weld appearance of vacuum laser welding is actively controlled, finally effectively realizes the online closed-loop monitoring of vacuum laser welding process.

The invention discloses a laser and arc composite oscillating welding device, comprising a welding gun, a laser head, a connecting assembly, a filament spacing adjustment assembly, a motor drive assembly and an angle adjustment assembly; the connecting assembly comprises a flange connecting column, a main body rib plate, an oscillating welding gun main body connecting plate and a laser head connecting plate, the oscillating welding gun main body connecting plate is connected to the filament spacing adjustment assembly and the motor drive assembly, and the laser head connecting plate is fixed to the laser head; the angle adjustment assembly is connected to the motor drive assembly, and the welding gun is fixed to the angle adjustment assembly; the invention combines laser oscillation and arc oscillation to obtain a laser and arc composite heat source, giving full play to the advantages of laser and arc composite welding and oscillating welding; at the same time, by increasing the melt width, the acceptable weld gap of the welding process is increased and the fault tolerance of the workpiece assembly is improved; by stirring the molten pool, the flow behavior of the molten pool is changed to make the distribution of metal elements in the weld more uniform; by combining the heat sources, the heat input is increased and the penetration depth is increased.

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 present invention provides a laser welding method for welding a welding part by using a laser. The laser welding method comprises: a step of overlapping the laser and a measuring light with a wavelength different from that of the laser to form a coaxial overlap and irradiating the weld part; a step of measuring the penetration depth of the weld part based on the measuring light reflected at the weld part during the laser welding; a step of determining the direction of optical axis deviation of the measuring light relative to the laser by relative comparison of a plurality of measured values; and a step of performing correction so that the irradiation position of the measuring light is moved to a specified area centered on the optical axis of the laser, wherein in the step of correcting the irradiation position of the measuring light, the correction is performed so that the irradiation position of the measuring light is moved to the rear of the optical axis center of the laser in the welding direction.

The invention relates to the field of laser processing, in particular to a glass three-dimensional curved surface femtosecond laser welding method based on space-time focusing and multi-physics field coupling. Comprising the following steps: combining multiple beams of femtosecond laser, infrared laser and ultraviolet laser, regulating and controlling through a synchronous space-time focusing system, coaxially combining the beams to one light path in space, respectively focusing at the joints of the three-dimensional curved surface of the glass, and realizing initial melting by utilizing nonlinear absorption induced by the femtosecond laser, infrared laser enhances heating and fusion depth control, and ultraviolet laser performs nanometer remelting treatment on the edge of a welding seam, so that the welding compactness and the bonding strength are improved; in the infrared laser welding process, low-frequency ultrasonic waves are introduced to regulate and control a molten pool microstructure and release residual stress, wavefront regulation and control, an AI module and interference feedback are matched, high-stability closed-loop welding control under the synergistic effect of multiple physical fields is achieved, and the glass welding efficiency, adaptability and welding quality are remarkably improved.

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.

One purpose of the invention is to provide a continuous laser high-stability welding method for a ceramic material. The continuous laser high-stability welding method comprises the following steps: S1, coating a layer of carbon particles of 100-500 nm on a ceramic surface; and S2, under the long-focus condition, continuous laser with specific power is selected to weld the ceramic material. For the aluminum oxide ceramic wafer, aiming at the specific welding depth, under the condition that the welding time and the welding area are fixed, the relation between the melting depth and the laser power is D = 0.17584 * P * T / A, D is the melting depth, and the unit is mm; p is laser power, and the unit is W; t is the welding time, and the unit is s; a is the area of a welding area, and the unit is mm < 2 >. By adopting the design of a long-focus optical system, under the conditions of lower power density, larger light spot size and longer focal depth, focusing conditions and laser power parameters can be accurately regulated and controlled according to the requirements of ceramic samples with different thicknesses, and uniform and stable melting of materials in a specified depth direction is realized; therefore, material vaporization and welding defects caused by material vaporization are avoided.

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 application discloses a kind of finite element simulation methods for accurately calculating electric arc additive manufacturing temperature field and stress field, belong to additive manufacturing technical field.The method is first obtained by 3D profilometer the geometric structure of electric arc additive manufacturing deposition sample, then the melt width, melt depth and excess height of each deposition layer are obtained by wire cutting, based on the actual additive parameters of each deposition layer, construct simulation heat source model, three heat sources are considered in simulation heat source model, and the heat distribution in the actual additive manufacturing process is fully considered.The application combines three-dimensional scanning technology with electric arc additive manufacturing temperature field and stress field simulation, obtains the actual geometric structure and topography of deposition layer through external detection means, calculates the electric arc additive manufacturing deposition layer temperature field and stress field based on the real topography of deposition layer, compared with the existing electric arc additive manufacturing simulation, the reduction degree of the distribution of calculated temperature and stress in deposition layer can be greatly improved.

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.

The invention relates to a welding spot arrangement method for casting an aluminum alloy side transmission box body, which comprises the following steps of: carrying out local penetration controllable welding on a gear chamber and an outer shell casting blank along a preset bionic net-shaped track by adopting laser welding equipment, and integrally carrying out cobweb-shaped distribution with dense inside and sparse outside; in the welding process, the state of a molten pool is monitored in real time, and the laser power and the welding speed are dynamically adjusted. According to the method, by accurately controlling the laser power, the pulse width and the welding spot distance, the local fusion depth of a welding seam area is controllable, the excessive heat influence on a casting body is avoided, it is ensured that a welding joint is compact in structure and free of air holes and cracks, and the crack resistance and the fatigue life of the welding seam area are effectively improved.

The application discloses an austenitic stainless steel welding method and a welded assembly. The welding method comprises the following steps: assembling two welding units: each welding unit has an I-shaped groove and a U-shaped groove; the I-shaped groove is welded by laser deep penetration welding; and the U-shaped groove is welded by laser wire filling welding. By combining laser deep penetration welding and laser wire filling welding, the penetration depth of the austenitic stainless steel reaches more than 50 mm, compared with the submerged-arc welding or gas shielded welding method of the austenitic stainless steel with large thickness. Laser welding can greatly reduce the weld volume, and the heat input of laser welding is far less than that of submerged-arc welding or gas shielded welding, so that the welding deformation can be effectively controlled, the laser weld quality is high, and defects are few.