50 results about "Fusion zone" patented technology

The invention relates to a nanoindentation and reliability characterization technology thereof, in particular to a heterogeneous material welding reliability characterization method applied to a brush type sealing structure. By means of the nanoindentation technology, mechanical properties such as hardness, elasticity modulus and plastic deformation of the welded joint are obtained by analyzing indenter deformation and indentation morphology. Meanwhile, indentation testing is carried out on different positions of the brush type sealing welding joint, and the performance comparison condition of all areas of the welding joint is obtained. Compared with a traditional reliability characterization means, the device and the method have the advantages that various areas of the heterogeneous welding joint including a base material, a heat affected zone and a fusion zone are tested under the nanoscale, various material performance indexes such as hardness, elasticity modulus and plastic deformation are measured at the same time, and the device and the method have high-precision and multifunctional testing capacity and are suitable for popularization and application. And moreover, the joint cannot be damaged or other properties cannot be influenced, and compared with a room-temperature stretching result, the nanoindentation technology has relatively high reliability and repeatability, and an accurate characterization result is obtained.

The invention belongs to the technical field of intelligent processing of metal materials, and particularly discloses a method for predicting and controlling the obdurability of pipeline steel. The method comprises the steps that firstly, physical property parameters of the pipeline steel are obtained, and a microstructure regulation and control model containing a weld joint melting zone and a heat affected zone is established; setting welding and heat treatment process boundary conditions based on a service environment, executing microstructure simulation, and analyzing grain size distribution and each phase content; further establishing a Hall-Petch formula coupled with a grain size distribution correction coefficient and a grain size related power-law hardening model to predict yield strength and toughness; and finally, precise regulation and control of the obdurability are realized by iteratively adjusting process parameters. The method solves the problem that an existing obdurability prediction technology does not fully consider the influence of the microstructure, and the performance reliability of the pipeline steel under the service working condition is remarkably improved.

The utility model relates to the technical field of batteries, in particular to a connecting piece, a battery cell and a battery pack. The connecting piece comprises a connecting piece main body which is provided with a first connecting part and a second connecting part; the first connecting part is provided with a fusing area and a first connecting area used for being connected with a pole, the second connecting part is provided with a second connecting area used for being connected with a tab, and the fusing area is arranged between the first connecting area and the second connecting area; a concave thinning part is arranged on the fusing region, the surface area of the part, except the thinning part, of the fusing region is 6mm < 2 >-12mm < 2 >, and the thickness of the first connecting part in the fusing region is 0.6-1.5 mm. According to the utility model, the fusing region can be disconnected in time when the battery cell is short-circuited, the structural strength of the fusing region can be ensured, and the reliability of the connecting sheet is improved, so that the use requirement of the connecting sheet when the battery cell is in a normal working state is met, the condition that the connecting sheet is broken under a non-short-circuit condition is avoided, the service life of the battery cell is prolonged, and the reliability of the battery cell is improved.

The invention provides a quantitative evaluation method for micro-area comprehensive mechanical properties of an electron beam welding joint, and belongs to the technical field of material mechanical property evaluation.A load-displacement curve is obtained through a nanoindentation test, and a data processing method combining numerical integration and high-order derivative calculation is adopted, so that the comprehensive mechanical properties of the electron beam welding joint are evaluated. Meanwhile, three performance parameters of strength, plasticity and strain hardening are extracted, and a quantitative mapping relation between the three performance parameters and the microcell structure is established. The method solves the problem of mechanical property quantitative evaluation of gradient structures of a fusion zone, a heat affected zone and a base metal zone of a welding joint, and the problems of high cost, low efficiency, single parameter and the like in the existing evaluation technology.

The invention provides a fractal porous orifice plate flowmeter design method and a fractal porous orifice plate flowmeter, and belongs to the technical field of fractal orifice plate designing.The fractal porous orifice plate flowmeter design method comprises the steps that according to fractal strategy parameters and fractal strategies, basic fractal elements are designed; fractal pore plate units are obtained through fractal design according to the fractal strategy parameters and the basic fractal elements; the fractal pore plate unit is integrally shrunk, and the designed fractal porous pore plate flowmeter is obtained. The fractal theory is introduced, the design method of the fractal porous orifice plate flowmeter is established, the limitation of conventional porous layout is broken through, the fractal porous orifice plate flowmeter with strict self-similar characteristics is designed, and the fractal orifice plate has the advantages in the aspects of pressure loss and pressure recovery compared with a traditional orifice plate; the excellent metering characteristic is benefited from local fusion and local joint development of small-scale jet flow, a local fusion area induces a pressure negative peak value, a local joint area enables the pressure negative peak value to recover rapidly, and the recovery speed is also remarkably higher than that of a traditional configuration.

The invention relates to the technical field of welding processes, in particular to a welding process method for optimizing martensitic stainless steel welding three-zone hardness, which comprises the following steps: welding by adopting gas metal arc welding, and controlling heat input to slow down the cooling rate; dual tempering heat treatment is carried out after welding, specifically, the first tempering temperature is 650-700 DEG C, and after first tempering, standing is carried out for a preset time length, and cooling is carried out to the room temperature; tempering for the second time at the temperature of 580-620 DEG C; wherein the base material is ultra-low carbon martensitic stainless steel, and the welding material is a nickel-molybdenum alloy welding wire matched with the base material. According to the method, gas metal arc welding is adopted for welding, and heat input is controlled to slow down the cooling rate; double tempering heat treatment is carried out after welding, the hardness of a weld zone, a fusion zone and a heat affected zone is eventually homogenized, and synergistic improvement of hardness homogenization and corrosion resistance is achieved.

The invention provides a semiconductor pipeline weld joint intelligent detection and compensation method based on space attention, and the method comprises the steps: recognizing an internal fusion region image, an external fusion region image, an internal heat affected region image and an external heat affected region image of a welded special gas pipeline based on a collected 2D image and 3D point cloud of the welded special gas pipeline; respectively inputting the internal fusion region image, the external fusion region image, the internal heat affected region image and the external heat affected region image of the welded special gas pipeline into a pre-trained welding defect identification model to obtain a defect identification result output by the welding defect identification model, the defect identification result is used for indicating a welding defect type and a defect quantification out-of-tolerance degree value existing in the welded special gas pipeline; and on the basis of the defect recognition result, a corresponding process compensation scheme is matched in a process parameter association library, so that welding process parameters of the subsequent welding special gas pipeline of the tungsten electrode track welding equipment are adjusted.

To provide a spark plug that can reduce the generation of a gap at an interface.SOLUTION: A spark plug includes a first electrode including a base material and a chip bonded to the base material through a fusion part, and a second electrode facing a discharge surface of the chip in a direction of an axial line. When a line parallel to the axial line is drawn at a cross section that is parallel to the axial line and includes the chip, the fusion part, and the base material, there exists a first uneven part having three or more intersections between the line and a first border between the base material and the fusion part or a second uneven part having three or more intersections between the line and a second border between the chip and the fusion part.SELECTED DRAWING: Figure 2

The invention relates to the technical field of aluminum pipe welding, in particular to a welding device for aluminum flat pipe production and processing and a welding method.The welding device comprises a base, two containing frames for containing aluminum flat pipes are slidably installed on the base, abutting assemblies are arranged on the sides, away from each other, of the two containing frames, and limiting plates are slidably installed on the inner sides of the containing frames through electric sliding blocks; the non-welding end of the aluminum flat pipe is fixed through the abutting assemblies, sliding caused by welding impact is effectively prevented, it is ensured that a welding seam and welding parts are kept on the same vertical face all the time, the problems of misalignment and dislocation are solved, the upper side and the lower side of the welding seam are heated at the same time through synchronous welding of the upper welding part and the lower welding part, and the welding quality is improved. The method has the advantages that thermal stress is balanced, warping or twisting deformation caused by single-side high temperature is reduced, residual stress is reduced through synchronous cooling, the method is particularly suitable for thin-wall aluminum flat pipes, structural stability is improved, a uniform fusion area is formed through continuous welding, stress concentration is avoided, and tensile strength, shear resistance and fatigue resistance of weld joints are enhanced.

The invention provides a photovoltaic module. The photovoltaic module comprises a first cover plate, a first adhesive film, a battery layer, a second adhesive film and a second cover plate. The second cover plate comprises a groove body, the first cover plate blocks the groove body in the thickness direction of the photovoltaic module to form a sealing cavity, and the first adhesive film, the battery layer and the second adhesive film are all located in the sealing cavity. The first cover plate and the second cover plate are fixed in a laser welding mode, in the laser welding process, a fusion area is formed on the contact face of the first cover plate and the second cover plate, and the sealing performance of the first cover plate and the second cover plate is improved through the fusion area; therefore, the risk that water vapor permeates into the photovoltaic module through the contact surface of the first cover plate and the second cover plate is reduced, the sealing performance, moisture resistance and salt fog resistance of the photovoltaic module are improved, the reliability and power reduction of the photovoltaic module are improved, and the service life of the photovoltaic module in a high-humidity or salt fog environment is prolonged.

The invention belongs to the technical field of microstructure simulation, and provides a method for simulating a local corrosion process of an Al-Cu-Li alloy laser welding joint aiming at the problem that a traditional CA model has defects in simulation of microscopic grain structure characteristics, the CA model is reconstructed on the basis of a Voronoi diagram method and test characterization data, and the local corrosion process of the Al-Cu-Li alloy laser welding joint is simulated. An intermetallic compound is introduced into a model for the first time, a three-dimensional CA model containing seven types of cells and five evolution rules is systematically constructed, and reproduction of local corrosion processes such as grain boundary preferential dissolution and corrosion channel expansion of a fusion region in an acid environment is achieved. Optimization design is carried out on model parameters based on a deep learning training algorithm, and the optimized model well reflects the actual intergranular corrosion morphology of the fusion zone.

The present disclosure provides a 5XXX aluminum alloy capable of refining MIG weld grains and a preparation method and application thereof. The 5XXX aluminum alloy includes the following compositions in percentage by weight: 4.0-4.9% of Mg, 0.2-0.5% of Mn, 0.01-0.06% of Ti, 0.1-0.35% of Fe, less than 0.05% of B, and the balance of Al and inevitable impurities. The preparation method includes subjecting raw materials to casting to obtain an ingot, where the Ti is added through an Al-5Ti-1B intermediate alloy at 750-770° C.; subjecting the ingot to homogenization treatment at 500-520° C. for 3-5 h; and subjecting the ingot to hot rolling, cold rolling and annealing. The 5XXX aluminum alloy of the present disclosure can effectively adjust the grain size in a weld zone and a fusion zone when applied to MIG welding, grains in the weld zone are refined to 30-40 μm, and the weld strength is greatly improved.

The application provides a method for improving the elongation of a high-strength aluminum alloy medium plate welded joint, which comprises the following steps: butting and assembling two welding workpieces with equal thickness to form a flat plate-shaped workpiece to be welded; determining first optimized process parameters of a laser-arc hybrid welding device and second optimized process parameters of a laser heat conduction welding device, wherein the second optimized process parameters are determined according to the front surface fusion width FW and the back surface fusion width BW of the welded joint formed according to the first optimized process parameters; using the first optimized process parameters to perform laser-arc hybrid welding on the front surface welding area of the flat plate-shaped workpiece to be welded, and simultaneously using the second optimized process parameters to perform laser heat conduction welding on the back surface welding area of the workpiece to be welded. The laser heat conduction welding acts on the back surface welding area, so that the back surface fusion zone and the corner part of the base material surface realize smooth transition, the stress concentration at the weld toe is relieved, and the post-weld elongation of the welded joint is improved under the premise that the strength of the welded joint meets the design standard.

The present application relates to metal piece welding technical field, especially a kind of metal piece automatic welding system;Including rack;Rotary mounting has tray on rack, fixed plate is installed on the upper end of rack by support column, and limit mechanism is equipped on fixed plate, and fixed mechanism is equipped on tray;The present application solves the problem that welding displacement and rotation are not synchronized through the linkage design of fixed mechanism and limit mechanism.Synchronous trigger sliding ring in fixed mechanism when lower pressing plate moves down, and extruding piece clamping support plate is driven through connecting rod, and positioning block expands radially to support and adjust support plate and screw under the action of guide piece;Linkage part in limit mechanism drives limit block extruding nut and forms two-way constraint with upper end face of rotary disc;Reinforcing part synchronously implements radial support to middle part of screw and presses down support plate to limit vertical displacement.Three linkage eliminates the displacement problem of component caused by high-temperature expansion and vibration, ensures that welding position is accurate and fusion zone thickness is uniform.

The invention provides a welding method for reducing welding cracks of a Ti2AlNb alloy. The welding method comprises the following steps: preheating the Ti2AlNb alloy to be welded before welding; the preheated Ti2AlNb alloy is subjected to wire filling welding; and after welding is completed, a welding part is rapidly subjected to postweld heat treatment, and the Ti2AlNb alloy welding part without welding cracks is obtained. According to the Ti2AlNb alloy welding method, the cooling rate after welding can be effectively reduced through preheating treatment before welding, thermal stress accumulation of a welding joint is reduced, an intergranular liquid film is prevented from being torn due to the stress effect after welding, and the overall quality of the Ti2AlNb alloy welding joint is greatly improved; according to the method, ultrahigh-frequency pulse welding and the wire filling technology form a synergistic effect, ultrahigh-frequency pulses can precisely refine the structure of a weld joint fusion area, continuous distribution of intergranular finally-solidified residual eutectic liquid phases at the grain boundary is avoided, the wire filling technology can effectively compensate the shrinkage amount in the welding process, and the welding quality is improved. And therefore, the stress concentration phenomenon of the welding joint is avoided, initiation and extension of welding cracks are inhibited, and the quality stability of the Ti2AlNb alloy welding joint is improved.

The invention discloses an electric heating repairing and strengthening method for a TC4 titanium alloy welded joint, which adopts a high-energy pulse current processing device to carry out short-time and rapid heat treatment on the specified TC4 titanium alloy welded joint by changing electric pulse parameters under the protection of inert gas so as to repair the defects of a welding fusion zone and improve the phenomena of coarse grains and the like in a heat affected zone. The method is simple, rapid, efficient and energy-saving, fixed-point heat treatment can be carried out on the designated area of the component, the mechanical property of the welding area can be improved and recovered, the strength and plasticity of the titanium alloy are improved at the same time, the strength is improved by 21-41 MPa, meanwhile, the plasticity is improved by 29%-55%, and the method has good application prospects.

The present application relates to the technical field of welding repair, and discloses a P91 steel welded joint repair method, which comprises the following steps: S1, chiseling a repair welding groove on the weld of a workpiece; S2, performing repair welding in a multi-layer and multi-pass manner, wherein the welding material is ENiCrFe-3, the inter-pass temperature of the repair welding is 100-150 DEG C, and the welding line energy is 10-20 kJ / cm; and S3, knocking the repair welding part and the periphery of the workpiece after the repair welding, wherein the number of times of knocking is 4800-5200 times / min.The present application has the beneficial effects that: the P91 steel welded joint is repaired by the multi-layer and multi-pass repair welding manner, thereby effectively reducing the thermal stress residue; the post-welding internal stress can be reduced by knocking treatment after the repair welding, the optimization of the weld residual stress of the repair welding area of the welded joint, the microstructure and mechanical properties of the repair weld and the fusion zone are realized, and the reliability and service life in the subsequent service process are improved; and the present application also has the advantages of simple process, easy operation, low cost, high repair efficiency, energy saving and environmental protection, etc.

The present invention discloses a plasma arc welding heat source model and modeling method that considers keyhole backward offset. The modeling method includes the following steps: S1: obtaining a weld image and fitting a polynomial equation for the fusion zone boundary line of the weld cross section and longitudinal section; S2: calculating the effective heating radius of the plasma arc welding; S3: calculating the weld centerline offset; S4: rotating around the weld centerline to obtain the geometric shape of the heat source; S5: establishing a heat source power density distribution formula considering the size factor; S6: constructing a heat source model and performing a sensitivity analysis on it to determine the regression equations of the ellipse factor and the size factor; S7: establishing a mathematical model for the heat source parameter optimization problem, determining the ellipse factor and the size factor, and obtaining the plasma arc welding heat source model that considers keyhole backward offset. The heat source model of the present invention has fewer parameter variables and considers keyhole backward offset, and can provide technical support for welding simulation of keyhole plasma arc welding.

The invention discloses a micro-fluidic chip for liquid drop fusion, and belongs to the field of microfluidics. The micro-fluidic chip comprises a liquid drop providing area, a liquid drop fusion area and a liquid drop stabilizing area. The oil phase in the droplet providing zone does not contain a surfactant so as to ensure the occurrence of droplet fusion. The liquid drops with different sizes enter the liquid drop fusion area after being injected or generated in the respective liquid drop providing areas. The liquid drop fusion area is provided with a deceleration fusion module so as to improve the fusion efficiency. By adjusting the injection and generation frequency of the liquid drops, the two liquid drops can be paired and fused in a liquid drop fusion area according to a specific proportion. And the fused liquid drops enter the liquid drop stabilizing area. An oil phase in the liquid drop stabilizing area contains a surfactant for stabilizing liquid drops and preventing further fusion of the liquid drops. According to the invention, efficient fusion of the liquid drops is realized by changing the concentration of the surfactant of the oil phase and the specially designed deceleration fusion module without relying on electric fusion, so that the complexity of a micro-fluidic chip and the cost of peripheral equipment are reduced.

The invention relates to the technical field of surfacing, in particular to a surfacing process and device for a charging bell. According to the surfacing process, the surface of a to-be-surfaced bell is cleaned, the welding starting position is preheated, and the preheating temperature is controlled to be not lower than 120 DEG C, so that intermolecular bonding during welding is promoted, and cracks are prevented from being generated after welding; the fusion zone, the interlayer temperature and the weld fusion ratio are controlled through specific welding current, surfacing voltage and gas flow, and it is guaranteed that in the surfacing process, weld forming is good, and the surface is smooth; multi-layer and multi-pass welding is adopted, so that heat of a molten pool and a heat affected zone is concentrated, the cooling speed after welding is reduced, crystal fusion between welding seams is promoted, and the surface layer does not have fusion defects.

To provide an electrofusion joint in which the strength of the electrofusion socket is appropriately improved. [Solution] The electrofusion joint 10 comprises a joint body 12 having an electrofusion socket 16 and a heating wire 20 embedded in the electrofusion socket. The heating wire has an effective heating wire portion 50 that is spirally provided near the inner circumferential surface of the electrofusion socket 16 in the fusion zone 40, and a reinforcing portion 52 that is spirally provided at a predetermined radial distance from the inner circumferential surface of the electrofusion socket in the cold zone 42 at the axial rear, so as not to melt the inner circumferential surface of the electrofusion socket during fusion.

A quasi-pulsed FRC deuterium-deuterium fusion reactor and its self-sustaining nuclear fuel cycle steady-state power generation method are disclosed. The reactor comprises a linear vacuum chamber, an FRC plasma formation zone, a collision fusion zone, a conical transition section, a plasma formation coil, a fast compression coil, a magnetic mirror coil assembly, a deuterium-tritium feeding system, a zoned vacuum pumping system, and a pulsed power control system. The magnetic mirror coil assembly is located near the collision fusion zone in the conical transition section. Within a single pulse cycle, it sequentially executes four functional modes: compression assistance, magnetic mirror reflection, magnetic bottle confinement, and recovery attenuation. During the recovery attenuation mode, it is reused as a direct energy conversion induction coil. The operation mode employs a trace amount of tritium to catalyze deuterium-deuterium fusion. Tritium and helium-3 are confined to participate in the secondary reaction through magnetic mirror confinement. Between pulses, the difference in chemical adsorption of tritium and the difference in cryogenic condensation of helium-3 are utilized to achieve selective recovery of the two components, forming a quasi-pulsed self-sustaining operation. The power is then converted into steady-state electrical power and connected to the grid via a rectification-storage-inverter system, realizing the internal recycling of tritium and helium-3.

A temperature sensor may include a baseplate and a housing. The baseplate may include a rim portion with a top surface. The housing may include a strut portion with a bottom lip. The bottom lip may abut to and be one of fused to the top surface by a fusion zone or brazed to the top surface by a braze joint. The temperature sensor may include a fusion zone fusing the bottom lip and the top surface or a braze joint brazing the bottom lip and the top surface. A portion of or an entirety of the top surface of the rim portion may be utilized in the fusion zone or the braze joint. The bottom lip may include a lattice which improves the wetting of the braze joint.

This invention relates to the field of heat treatment technology for metallic materials, and discloses a method for controlling the microstructure and mechanical properties of welded thick titanium alloy plates. The method includes the following steps: providing a titanium alloy welded joint obtained by a narrow-gap welding method; performing stress-relieving annealing on the welded joint to obtain a primary part; and subjecting the primary part to a secondary annealing heat treatment in the two-phase region of the titanium alloy, the secondary annealing heat treatment comprising multiple cycles of heat treatment to eliminate acicular martensite in the fusion zone of the primary part and to equiax the acicular structure, thereby obtaining a finished part. This invention can effectively eliminate acicular martensite within coarse grains in the fusion zone of the welded joint, promoting the transformation of the acicular structure into a uniform and fine equiaxed structure, effectively improving its strength and plasticity, and significantly improving the microstructure morphology and mechanical properties of the fusion zone.

The present application relates to the field of welding technology, especially to a welding method for high-strength stainless steel automobile fuel tank multi-layer plate structure. The present application first adopts resistance seam welding by adding triangular transition wedge for the multi-layer plate structure of the fuel tank shell and end cover, and then carries out circular polarization mode laser remelting welding along the newly formed weld, which can effectively reduce the welding defects of high-strength stainless steel automobile fuel tank multi-layer plate structure. The present application can effectively reduce the resistance welding defects caused by the sudden reduction of material due to the special overhanging structure of the transition area of high-strength stainless steel automobile fuel tank multi-layer plate structure by adding right-angled triangular wedge, and the second resistance welding circular polarization mode laser remelting can release the welding residual stress caused by high-strength steel resistance seam welding, so that the fine grain structure is formed in the weld area, the performance of the fusion zone is improved, the oil tightness of the automobile fuel tank during long-term use is ensured, and the high-frequency vibration requirement of high-strength stainless steel automobile fuel tank multi-layer plate structure during automobile driving is met.

The present application relates to the field of electronic digital data processing technology, and in particular to an aging analysis method for dissimilar steel welded joints of boilers, wherein the method comprises: performing a performance test on the prepared dissimilar steel welded joints to obtain performance test results; based on the performance test results, obtaining a first aging degree grading database corresponding to nonlinear ultrasonic coefficients and different aging degree data, and a second aging degree grading database corresponding to magnetic characteristic parameters and different aging degree data; using the first aging degree grading database and the second aging degree grading database, constructing an aging degree grading database for the prepared dissimilar steel welded joints at different aging degrees. Thus, the problem in the related art that brittle fusion zone composition, carbon migration, creep strength mismatch, and residual stress concentration are prone to occur, seriously threatening the safe operation of the unit, and the dissimilar steel welded joints have strong non-uniformity and are prone to cracking, etc.

The invention discloses a low alloy steel welding seam fusion area magnetic mark detection method and system equipment and a storage medium, and the method comprises the following steps: S1, judging the type of a magnetic mark defect in magnetic particle detection, judging that the defect is a surface opening defect when a sinking color mark is displayed in penetration detection, and otherwise, carrying out the next step; s2, performing penetration detection on the magnetic traces by using an alternating current magnet yoke method, and polishing the magnetic traces according to the buried depth of the magnetic traces; s3, magnetic particle detection is conducted on the polished area again, if magnetic marks disappear, it is determined that near surface defects exist and are removed, and a qualified detection report is given; if the magnetic trace display still exists, performing penetration detection on the magnetic trace display area again, and performing metallographic detection at the same time; s4, performing ray detection on the magnetic mark display area; s5, performing ultrasonic detection on the magnetic mark display part; and S6, analyzing a metallographic detection structure.

The application discloses a one-piece optical fiber coupler with flat-top light spot output, a preparation method and an output method, and relates to the technical field of laser light spot shaping. The one-piece optical fiber coupler with flat-top light spot output comprises an input optical fiber bundle, a multimode output optical fiber and a ball-burning transition structure. The output end of the input optical fiber bundle is formed into a taper fusion zone through tapering. The output end of the taper fusion zone is processed into at least one ball-burning structure through ball-burning, and the diameter of the spherical structure of the ball-burning structure is greater than the core diameter of the input optical fiber in the taper fusion zone, so that the proportion of high-order modes in laser is increased. The input end of the multimode output optical fiber is fusion-spliced with the ball-burning structure formed at the output end of the taper fusion zone of the input optical fiber bundle. The application can perform light spot shaping on a Gaussian-distributed laser beam to obtain flat-top light spot output, and does not need to increase a complex machining part structure, has a simple manufacturing method, a small size, a compact structure and good stability.

The utility model relates to a combination device capable of avoiding skin cracking and a rocket storage tank, the combination device at least comprises a corner piece, the corner piece comprises a vertical plate, an adapter plate and a connecting plate, the vertical plate is installed at the top end of the adapter plate, the vertical plate is perpendicular to the adapter plate, the connecting plate is installed at the bottom end of the adapter plate, and the vertical plate is used for installing accessory equipment; a plurality of welding through holes are formed in the adapter plate, and the connecting plates located in the welding through holes are welded to the skin body to form a welding fusion area. The welding penetration depth can be reduced, the rigidity of the welding position of the skin body is guaranteed, the welding area can be increased, the connecting strength of the corner pieces and the skin body is improved, and cracking of the skin body is avoided.

A welding method of welding, an end surface of end portions of a first member and a second member being arranged next to one another, by a laser beam with the end surface being disposed to face a laser processing apparatus, includes a first step of irradiating the first member with the laser beam to form a first fusion zone; a second step of irradiating the second member with the laser beam to form a second fusion zone; and a third step of, when the first fusion zone and the second fusion zone are bonded, irradiating the bonded first fusion zone and second fusion zone with the laser beam to form a single fusion zone, and the laser beam includes a first laser beam and a second laser beam having different wavelengths.