685 results about "Joint surface" patented technology

The invention relates to the field of geotechnical engineering, and discloses a self-stress anchor rod failure evolution simulation method for jointed rock mass bolting-grouting reinforcement, which comprises the following steps: S1, constructing a three-dimensional rock mass model containing a joint structure in an FLAC3D platform, and defining joint surface space distribution and geometric parameters; s2, a bolting-grouting structure is introduced into the three-dimensional rock mass model, an anchor rod, a grouting body and the contact relation between the anchor rod and the grouting body and the rock mass are set, and an anchor rod load transfer model is established; s3, a loading path is set, displacement control is adopted as a loading mode, and a certain included angle is formed between the loading direction and the joint surface; and S4, establishing a numerical model in FLAC3D, performing grid division, and setting a rock mass material constitutive model and contact surface parameters. By accurately controlling the loading direction and the loading angle in simulation and analyzing the change influence of different loading paths on the failure mode of the bolting-grouting structure, the problem that the traditional simulation method neglects the change of the failure mode under different loading conditions is solved.

The invention designs an assembly process error modeling method considering heat, and realizes rapid and accurate calculation of thermal deformation of an assembly junction surface affected by heat in the part assembly process. In the part assembling process, heat generated in the assembling process is an important influencing factor influencing the assembling precision. In order to realize rapid calculation of thermal deformation in a part assembling process, a prediction model of thermal deformation of an assembling joint surface in the part assembling process is constructed by utilizing a physical information neural network. According to the method, a full-connection neural network architecture is adopted, and boundary condition constraints are introduced into a loss function item for joint optimization training. Through minimization of a loss function, a driving model learns displacement distribution characteristics of an assembly joint surface under thermal deformation, and a mapping relation between a space coordinate point and a corresponding displacement amount is established. The model finally realizes the real-time prediction capability of the thermal deformation field of the assembly joint surface.

The invention belongs to the technical field of direct shear-seepage tests of rock joints, and discloses a numerical test method for direct shear-seepage of rock joints under different boundary conditions, which comprises the following steps of: establishing a joint surface numerical model by using finite element software, and performing tests for simulating joint shear mechanical behaviors by applying different boundary conditions. And the contact state and the opening distribution of the joint surface under different shear displacements are obtained, so that the shear stress evolution mechanism of the joint surface is better revealed, and the mechanical behavior of the rough joint surface in the shear process is accurately expressed. According to the method, the evolution law of mechanical properties in the joint shearing process can be reflected, the influence of shearing deformation on the joint seepage characteristics can be reflected, joint opening data distribution is imported into programming software to be processed, a joint seepage numerical model is constructed, then multi-physics field simulation analysis software is imported, and the joint seepage performance is improved. The flow velocity, the osmotic pressure and the streamline distribution characteristics in the flowing process are calculated, so that the joint permeability characteristics are analyzed.

The invention discloses a vacuum brazing quality detection method for a heat dissipation structure and related equipment, and the method comprises the steps: obtaining heat flux density distribution data of the heat dissipation structure, and dividing the heat dissipation structure into different functional regions according to a thermal efficiency index; differential thermal pulses are applied to the heat dissipation structure in the vacuum brazing process, and thermal pulse response data and technological process monitoring data are obtained; calculating a thermal response characteristic parameter, comparing the thermal response characteristic parameter with a preset parameter range, identifying an abnormal state and generating a process adjustment instruction; performing time-space synchronization processing on the thermal response characteristic parameters and technological process monitoring data, and determining defect types, positions and severity; and performing a thermal load test to obtain heat conduction characteristic data, and quantitatively evaluating the structural integrity and the heat conduction performance of the brazed joint surface. According to the method, the defects of the internal joint surface can be detected in real time in the vacuum brazing process, the heat dissipation performance is accurately evaluated, and the limitation of a traditional detection method in coping with a complex geometric structure is solved.

A connection structure has an extension direction and includes a fitting part, a fixing part, and a turning part. The fitting part includes two joint surfaces. The fixing part includes a surface. The turning part is connected between the fitting part and the fixing part, and the turning part is inclined relative to the fitting part and the fixing part. One of the two joint surfaces of the fitting part faces a same direction as the surface of the fixing part. An offset distance is between one of the two joint surfaces and the surface along a direction vertical to the extension direction. Thus, the connection structure of the present disclosure can prevent two different antenna modules in the electronic device from interfering with each other.

The invention relates to the technical field of steel structure welding, in particular to a full-penetration back-gouging-free welding process for a welding seam between a web plate and a wing plate of a crane beam. Comprising the following steps: preparing a web groove; welding steel plate pairs; web plates and wing plates are placed; backing a weld bead on the groove surface; welding the back surface once; and the other welding beads are formed on the groove surface. According to the full-penetration back-gouging-free welding process for the weld joint between the web and the wing plate of the crane beam, the weld joint penetration depth of groove surface welding and non-groove surface welding can better fuse the joint surface of the web and the wing plate, the sections of the two weld beads can be partially overlapped by selecting proper process parameters, and therefore full-penetration welding is ensured.

A polymer double-cavity prefilled syringe comprises a barrel with a bypass, the barrel is provided with a finger handle and an adapter, a needle seat is arranged on the adapter, a needle body is fixed on the needle seat, and a protective cap is arranged on the outer side of the needle body. A front plunger, a middle plunger and a rear plunger are arranged in the barrel, and the rear plunger abuts against a plunger rod. The cylinder is formed by integral injection molding of polymer, a group of ribs which are arranged side by side and protrude towards the interior of the cylinder are arranged on the inner wall of the cylinder, the axial length of each rib is larger than that of the middle plunger, the bypass is formed by a gap between every two adjacent ribs, and the outer diameter of the cylinder is larger than that of the adapter; the protective cap is tightly connected with the needle seat, a first anti-falling mechanism is arranged on the joint face of the protective cap and the needle seat, and an inner cavity of the protective cap is communicated with the outside through a bacteria-blocking, hydrophobic and breathable filter membrane. The bypass is formed in the mode that the protruding edges protrude inwards, demolding is convenient, integrated injection molding machining can be conducted through polymers, cost is low, damage is not prone to occurring, and the using effect is good. The outer surface of the cylinder is smooth, the heat conduction performance is good, and the vacuum freeze-drying efficiency is high.

The invention discloses an aluminum wiring terminal, a wiring terminal unit and an assembling method, and the method comprises the steps: carrying out the laser etching of a joint surface of an aluminum conductive sheet, forming a pretreated conductive sheet with a micro-nano structure, depositing a protective coating on the joint surface, and carrying out the curing, and obtaining a conductive sheet with a protective coating. And then crimping and assembling with an insulating shell assembly to form a crimping assembly, and fixing bolts are arranged in the insulating shell assembly. Applying resonance fastening of characteristic frequency to a fixing bolt in the crimping assembly, injecting a lubricating medium in the fastening process, performing synchronous detection and verification of multi-physical field parameters on the fastening assembly, and feeding back detection data to a production control system to optimize assembly process parameters; the micro-nano structure is constructed on the joint surface of the conducting strip and the protective coating is deposited, so that the interface conductivity and oxidation resistance are remarkably improved, online detection and dynamic feedback optimization are integrated, and the consistency and reliability of the product are improved.

The invention discloses a machine tool dynamic characteristic finite element calculation method based on bolting joint surface parametric modeling, and belongs to the technical field of bolting joint surface and machine tool overall modeling and simulation. According to the method, a gantry machine tool reduced scale model is taken as an example, contact parameter calculation is conducted on bolting joint surfaces based on the fractal theory, then finite element parametric modeling is conducted on the bolting joint surfaces through an abaqus basic connector unit, and dynamic performance analysis of the whole machine is completed. Compared with a test method, the accuracy of the method is proved. According to the method, more accurate and more efficient calculation of the dynamic performance of the machine tool is realized, and a theoretical basis is provided for subsequently exploring the influence of each combination surface on the dynamic performance of the whole machine.

The invention discloses a part joint degree thermal resistance testing method based on natural convection cooling, and relates to the technical field of thermal resistance testing. The problems that in the prior art, testing time is long, efficiency is low, drying cost is increased, and production efficiency is reduced are solved. Through test preparation, real-time monitoring and control, temperature difference calculation and repeated test verification, the thermal conductivity and the processing quality of the joint surface of the component can be quickly judged, the production efficiency is effectively improved, the test cost is reduced, the test conditions are accurately controlled, the thermal steady state is quickly achieved, the test time is remarkably shortened, the test efficiency is improved, and the test cost is reduced. Meanwhile, the drying cost is reduced, the production efficiency is improved, the stability and the reliability of a test result are ensured through repeated testing and verification, the processing quality of a component joint surface can be accurately evaluated, whether the joint process is qualified or not is quantitatively evaluated by establishing a standard temperature difference threshold value, and the reliability of the test result is enhanced.

To provide a conjugate of laminate molded resin part that is resistant to bending loads and can be made large.SOLUTION: A conjugate of laminate molded resin part 10 is a rectangular prism with square end faces and is composed of a laminate molded resin part 11 having an inverted cone-shaped joint surface 11a, a laminate molded resin part 12 having a cone-shaped joint surface 12a, and an adhesive layer 13 that fits and joins the inverted cone-shaped joint surface 11a of the laminate molded resin part 11 and the cone-shaped joint surface 12a of the laminate molded resin part 12. A longitudinal direction X perpendicular to a laminate direction Y of the laminate molded resin part 11 and the longitudinal direction X perpendicular to the laminate direction Y of the laminate molded resin part 12 are made continuous with each other.SELECTED DRAWING: Figure 1

The invention relates to the technical field of cables, in particular to a cable joint connection fault detection device which comprises a detection mechanism, the detection mechanism comprises a detection box, the two sides of the top of the inner wall of the detection box are fixedly connected with downward pressing positioning assemblies, and the two sides of the bottom of the inner wall of the detection box are fixedly connected with supporting plates. A contact impedance tester is arranged on the front side of the top in the detection box, mounting boxes are arranged on the two sides of the bottom of the detection box, and cooling fans are fixedly mounted in the mounting boxes; the lifting and attaching mechanism comprises a lifting hydraulic cylinder, the lifting hydraulic cylinder is fixedly connected to the top of the detection box, the output end of the lifting hydraulic cylinder penetrates through the bottom of the detection box, and the contact impedance tester can be attached to cable joints of different sizes through an attaching assembly in the lifting and attaching mechanism. And the rotary cleaning mechanism can clean the surface of the joint needing to be detected in the lifting process of the lifting plate.

The invention discloses a method and a device for determining assembly fastening force of a bolt joint part, and relates to the technical field of intelligent manufacturing. The method comprises the steps that three-dimensional point cloud measurement data of a target joint surface are acquired, and the three-dimensional point cloud measurement data comprise geometric distribution error data and / or position error data; generating a target digital twin model according to the target three-dimensional point cloud measurement data; according to the target digital twin model, stress states of a target joint part corresponding to the target joint surface are simulated, and the stress states comprise a static stress state and / or a dynamic stress state; and according to the stress state simulation information, determining a target assembly fastening force of the target joint part. According to the method, the manual dependence degree in the bolt joint part assembling fastening force determination process can be reduced, so that the labor cost in the bolt joint part assembling fastening force determination process is reduced, and the determination precision and the determination efficiency of the bolt joint part assembling fastening force can be improved.

The invention belongs to the field of machining, and discloses a modeling calculation method and system for dynamic rigidity of a cutter handle-main shaft combination part, and the method comprises the following steps: S1, modeling a geometric structure and dynamic displacement of the combination part; s2, performing multi-scale modeling on the contact surface morphology and solving the normal spacing variation of the joint part; s3, joint surface micro-convex body contact characteristic modeling is carried out; s4, modeling the non-linear stiffness of the infinitesimal junction surface; and S5, constructing an integral dynamic stiffness matrix of the joint part. According to the modeling calculation method for the dynamic stiffness of the cutter handle-main shaft combination part, high-precision modeling of the dynamic characteristics of the cutter handle-main shaft combination part is achieved through a step Timoshenko straight beam model and a distributed nonlinear spring layer in combination with a slicing method and a fractal contact theory. The method is suitable for high-precision nonlinear dynamic modeling of a numerical control machine tool, a machining center and the like, and vibration, deformation and stability problems in the machining process can be effectively predicted.

The invention discloses a modeling method for three-dimensional jointed rock masses with different roughness degrees and penetration degrees, which comprises the following steps of: 1, setting shape and size parameters of the rock masses, and generating a model space according to the shape and size parameters of the rock masses; step 2, setting joint parameters; and step 3, joint orientation control. And step 4, joint form control. And 5, modeling the residual space as a rock material to obtain a final jointed rock mass model. According to the method, morphological characteristics of real joints can be reflected, the obtained model is more practical, and a more accurate numerical model is provided for subsequent simulation analysis; according to the method, the spatial distribution characteristics of the joint surfaces can be freely controlled, and the analysis of the mechanical characteristics of the rock mass under multi-joint or different joint distribution conditions is facilitated. According to the method, the three-dimensional jointed rock mass model can be conveniently and quickly obtained, and the modeling process can be simplified. And the jointed rock mass model generated each time has non-repeatability, so that the randomness of the jointed rock mass model is ensured.

The utility model provides a sand blasting shielding tool for casting an electrode of a resin insulating spacer, which comprises a first shielding piece, a second shielding piece and a third shielding piece, and the first shielding piece is provided with a first joint surface close to a first surface of the electrode so as to shield the first surface; the second shielding piece is provided with a second joint surface which is close to a second surface, opposite to the first surface, of the electrode so as to shield the second surface, particularly, the first shielding piece comprises a first wear-resistant material part for providing a first joint surface, and a second wear-resistant material part for providing a second joint surface; the second shielding piece comprises a second wear-resistant material part for providing a second joint surface, and the first wear-resistant material part and the second wear-resistant material part are made of wear-resistant plastic materials. According to the sand blasting shielding tool, the first wear-resistant material part and the second wear-resistant material part which are made of the wear-resistant plastic materials are arranged, so that the wear-resistant performance is effectively improved, the service life of the tool is prolonged, and the cost problem caused by frequent replacement of the tool is further solved.

The invention discloses a bimetal thin strip rolling composite interface strengthening method and device based on middle-pass roller roughening. The method comprises the steps that basic parameters of a bimetal thin strip and rolling capacity parameters of a rolling mill are obtained; calculating the limit composite thickness of each pass based on the rolling mill capacity parameters and the basic parameters; based on the limit composite thickness, the number of passes needed by the rolling technology is determined; testing the surface appearance of the composite strip rolled in each pass, and determining the evolution rule of the surface roughness; and based on a surface roughness evolution rule, a texturing roller is adopted for rolling in the middle pass, and a smooth roller is adopted for rolling in the last pass. The texturing roller is introduced into the middle pass, so that the dissimilar metal bonding area is remarkably increased, the interface bonding strength is effectively improved, meanwhile, the deformation resistance difference of dissimilar metal is balanced, the material coordinating deformation capacity is improved, and the phenomena of brittle compound generation and shear stress concentration at the interface are restrained; therefore, the overall performance and quality of the composite thin strip are remarkably improved.

The invention discloses a method and a system for calculating dynamic contact rigidity and damping of an assembly joint surface considering anisotropy, and belongs to the field of machine manufacturing. The method comprises the following steps: acquiring three-dimensional shape data of a joint surface, fitting micro-convex bodies with anisotropy, and acquiring characteristic parameters of all the micro-convex bodies; on the basis of the characteristic parameters of the micro-convex bodies and the static contact distance between the two surfaces of the joint surface, the micro-convex bodies capable of being contacted are judged, and static contact parameters of a contact pair formed by the micro-convex bodies capable of being contacted are calculated; based on the static contact parameters of the micro-convex body contact pairs, mechanical models of the micro-convex body contact pairs are established, and static contact loads of the micro-convex body contact pairs are calculated respectively; and calculating the contact rigidity and damping of the joint surface under dynamic disturbance based on the static contact load and disturbance displacement of all the micro-convex body contact pairs. The method provides a theoretical model and a scientific basis for predicting the contact characteristics of the assembly joint surface, and is of great significance in promoting the progress and application of digital design, manufacturing and assembly of the joint surface.

The utility model discloses an anti-corrosion structure of an electrical equipment shell and an electric drive assembly, and relates to the technical field of anti-corrosion, the electrical equipment shell comprises a first shell and a second shell, the first shell and the second shell are made of different metal materials, and the first shell is made of magnesium alloy; the anti-corrosion structure comprises a first flow guide part and a second flow guide part, the first flow guide part is arranged at the bottom of the first shell in the using state, and the second flow guide part is arranged on the side face of the electrical equipment shell in the using state. According to the utility model, through the first flow guide piece and the second flow guide piece, the salt mist liquid can be prevented from being gathered at the joint surfaces of the first shell and the second shell, so that the corrosion condition is reduced. Therefore, the anti-corrosion performance of the electrical equipment shell can be improved.

The invention discloses an electric drive axle assembly and a vehicle. The electric drive axle assembly comprises an axle housing, a speed reducer box body and a fastening strip, the axle housing is provided with a mounting channel penetrating in the first direction. The speed reducer box body is mounted in the mounting channel along the first direction; the fastening strip is installed outside the speed reducer box body, the fastening strip, the axle housing and the speed reducer box body are connected through a first connecting piece arranged in a penetrating mode in the first direction, and the fastening strip is connected with the speed reducer box body through a second connecting piece arranged in a penetrating mode in the second direction. According to the electric drive axle assembly, the problems that under the alternating load effect, a connecting piece of the axle housing and the speed reducer box body is prone to loosening, and the joint face of the axle housing and the speed reducer box body deviates relatively are solved.

Methods, systems, and devices for treating osteochondral defects (OCDs) are disclosed. The disclosed methods and systems include collecting joint surface data using image-free methods, generating a three-dimensional (3D) healthy bone model based on the joint surface data and a database of healthy bone anatomies, defining the OCD boundary on the joint, generating a 3D implant model based on the 3D healthy bone model and the OCD boundary, manufacturing an implant based on the 3D implant model, generating an implantation plan, the resected cavity on the joint. The implant includes a 3D-printed titanium alloy substrate having a first and second porous layer separated by a nonporous layer. A polymer material is over-molded onto the second porous layer and treated to exhibit properties that mimic cartilage, while the first porous layer allows the implant to fuse to patient bone.

There is disclosed fluid distribution junctions and methods of assembly therefor. Flexible conduits connect to the junctions, and a consumable subsystem of the junction, conduits and receptacle caps or other connectors may be pre-assembled for ease of use. A subassembly is formed by coupling a plurality of flexible tubular conduits to a plurality of fluid connectors of a fluid junction, the fluid junction having an inner fluid plenum chamber leading to the fluid connectors. Two shells are sandwiched on opposite sides of the subassembly, the shells having mating concave receiving surfaces that together conform around each of the fluid connectors and clamp the tubular conduits onto the circular beads. Juxtaposed joint surfaces on each pair of mating concave receiving surfaces are bonded together such as with sonic welding to make the fluid distribution junction assembly.

The embodiment of the utility model provides a heat insulation expansion joint which comprises a corrugated pipe, a lining pipe and at least two flange plates, a heat preservation layer is arranged between the corrugated pipe and the lining pipe, the flange plates are arranged at the ends of the corrugated pipe, the lining pipe is provided with a turnover edge, and the turnover edge is connected with the flange plates. The folded edge is flush with the flange plate to form a joint face, and the joint face is used for being connected with an external pipeline. The heat insulation expansion joint can effectively dissipate heat so as to slow down the aging process of the heat preservation layer and the corrugated pipe, and normal operation of the expansion joint is guaranteed.

The valve assembly of the switching valve comprises a valve body and a valve seat, a valve cavity is formed in the valve body, a pipe inlet hole used for installing an air inlet pipe and a pipe connecting hole used for installing a connecting pipe are formed in the valve body, and the pipe inlet hole and the pipe connecting hole are both communicated with the valve cavity. The valve body is provided with a valve cavity and at least two pipe connecting holes, the pipe connecting holes are arranged at intervals in the axial direction of the valve body, the valve seat is located in the valve cavity, the position, corresponding to the pipe connecting holes, of the valve seat is provided with valve seat holes communicating the pipe connecting holes with the valve cavity, and the valve body is further provided with through holes used for containing welding materials. The through hole penetrates through the valve body in the wall thickness direction of the valve body. By means of the arrangement, the combination face between the valve body and the valve seat is completely filled and covered with the welding flux, the situation of welding breaking is prevented, the welding quality is improved, the combination strength between the valve body and the valve seat is better, and the better combination effect is achieved.

The invention provides a sliding guide rail system kinetic analysis method considering abrasion and creep, and relates to the technical field of numerical control machine tool kinetic analysis. The method comprises the following steps: firstly, establishing a multi-source wear model of a joint surface of an angular contact ball bearing, a lead screw-nut pair and a sliding guide rail, and constructing a creep degradation model of a bearing end cover bolt based on a Norton creep law; then correcting the elastic restoring force of the guide rail system by combining the evolution laws of the abrasion loss and the creep, and constructing a dynamic model of the bidirectional sliding guide rail system considering the comprehensive influence of the abrasion and the creep; bidirectional influence among abrasion, creep deformation and dynamic response is achieved, and finally the dynamic evolution law of the bidirectional sliding guide rail system under the long-term service condition is obtained. The method is clear in modeling process, high in universality and high in calculation precision, the degradation process of the dynamic characteristics of the guide rail system along with the service time can be truly reflected, and an effective theoretical basis is provided for numerical control machine tool service life prediction, structure optimization and operation reliability improvement.

The utility model provides an underground shock insulation waterproof instrument pier structure. The underground shock insulation waterproof instrument pier structure comprises an instrument pier body, a building structure body, a drainage ditch, a shock insulation groove, a shock insulation filling layer, a waterproof protection layer, a middle buried type water stop belt, an externally attached type water stop belt, water stop rubber, an additional waterproof layer and a bedrock surface. The drainage ditch is communicated with the top of the shock insulation groove and is used for timely draining water when the water exists and protecting the instrument pier and equipment; the instrument pier body and the building body are separated to form a vibration isolation groove which is filled with a vibration isolation filling layer. The waterproof protection layers are arranged in the shock insulation grooves and located on the upper side and the lower side of the Chinese type water stop belt; one end of the embedded water-stop belt is pre-mounted on the instrument pier body, and the other end of the embedded water-stop belt is pre-mounted in the building structure body; one end of the externally-attached water-stop belt is pre-provided with an instrument pier and bedrock attaching surface, and the other end of the externally-attached water-stop belt is pre-installed on a building structure body and bedrock attaching surface, so that the externally-attached water-stop belt is more and more tightly attached through water pressure generated when water exists. According to the utility model, the embedded waterstop and the externally attached waterstop are adopted, so that good shock insulation and waterproof effects can be achieved, and the accuracy of bedrock data observed by an instrument is ensured.

A kind of metal composite board precision machining device, including workbench, the top of workbench is sequentially spaced apart along its length direction and is equipped with feeding assembly, alignment assembly and forming assembly, the feeding assembly includes two groups of interval arrangement support, each group of support includes two opposite interval arrangement support plate, two parallel interval arrangement feeding rollers are rotatably installed between the two support plates of same group, two auxiliary rollers are rotatably arranged between the two feeding rollers, and the feeding gap for the passage of plate is formed between the two auxiliary rollers and corresponding feeding roller respectively;Two support plates arranged on the same side are fixedly provided with connecting plate between them, and cleaning assembly for removing impurities and cleaning the joint surface of base plate and cover plate is slidably arranged between the two connecting plates, and reciprocating assembly for driving cleaning assembly to reciprocate is symmetrically arranged between cleaning assembly and feeding roller. Avoiding impurities to be pressed and embedded in interlayer bonding interface under subsequent rolling pressure, the close contact of two sides fresh metal matrix is blocked.

The utility model relates to the field of pearl wool bottom box's production, especially a kind of ironing and sticking box machine, include steering mechanism, steering mechanism include the steering device of prompting bottom support active rotation, for rotating the each orientation of bottom support side face;Pearl wool side plate material feeding mechanism, include the side plate material feeding assembly moving to bottom support side face, wherein, the material feeding plate included in side plate material feeding assembly has the joint surface providing adhesion to pearl wool side plate, and, material feeding plate is equipped with multiple groups of directional components for the position calibration of different pearl wool side plate length;Heating mechanism, include the ironing plate moving to bottom support side face;The utility model includes the steering mechanism, pearl wool side plate material feeding mechanism and heating mechanism suitable for the preparation of new pearl wool bottom box in new technology, under new technology, single side plate orderly and bottom support side face carry out hot bonding, so that the pearl wool bottom box of new structure has more excellent flatness, solve the problem of stagger in prior art.

The present disclosure includes a laser welding method in which a joint surface between a plurality of workpiece members is welded by radiating laser beam LB, and a locus of laser beam LB is controlled so as to perform wobbling scanning Sw by a combination of scanning motion Sa moving along first direction x parallel to the joint surface and swing motion Sb including first swing component Bx along first direction x and second swing component By along second direction y perpendicular to first direction x, the method including a defect determination step of determining occurrence of a welding defect; and an output control step of increasing or decreasing an output of laser beam LB when laser beam LB is radiated again toward the welding defect in a case where the welding defect occurs.

The utility model provides a prefabricated channel relates to water conservancy engineering irrigation and drainage channel technical field. The prefabricated channel realizes the effective link of section through setting up support step and lap overstep at U type channel groove both ends, effectively avoids the dislocation of assembling lap joint and the damage of water stop, the joint of each section U type channel groove is constituted the combined type seepage prevention system by the joint surface sealing filler and the built -in water stop band, has improved the leakproofness and water stop effect of joint surface greatly, the top of channel groove adopts hidden type protection cover plate to cover, can strengthen the safety protection of irrigation and drainage channel, can slow down the silting of groove bottom obviously, is favorable to the later operation management maintenance, the wall body adopts the gradual expansion structure of overcurrent surface vertical, retaining soil surface inclination, can guarantee the overcurrent surface after the assembly of each adjacent U type channel groove is always even and straight, avoids the heterofacial convex, improves the flow state, U type channel groove adopts the whole prefabricated thin wall type structure, safe and stable, economic and practical, simple structure, can prefabricate or purchase the factory prefabricated product on the spot.