932 results about "Friction welding" patented technology

The invention provides a parameter control method and system in the friction stir welding process, and relates to the technical field of welding equipment of metal materials. The method comprises the steps that before friction stir welding is started, working condition information of a to-be-welded workpiece is input into a welding process simulation model for virtual test welding; screening out a plurality of groups of standard process parameter combinations meeting preset welding quality requirements; in the friction stir welding process, the change trend of all the technological parameters is determined according to the real-time technological parameter combination within the first preset time period; and if it is determined that the deviation risk exists in the current welding state within the second preset time period in the future according to the change trend, the standard technological parameter combination with the maximum similarity with the real-time technological parameter combination in the standard technological parameter library is determined as the target technological parameter combination to conduct parameter control adjustment on the welding equipment. By implementing the method, the welding defects caused by sudden change of the process window can be overcome, and the stability of the welding process and the consistency of the welding seam quality are improved.

Provided is an electrical steel strip friction stir welding method that is able to inhibit the occurrence of coil joint fractures on a production line caused by deterioration of mechanical properties and shape of the coil joint while maintaining high work efficiency and that is also advantageous in terms of rotating tool durability. In the method, preheated double-sided friction stir welding is performed, diameter D (mm) of shoulders of rotating tools satisfies the relationship of the following Expression (7), and rotation speed RS (r / min) of the rotating tools, the diameter D (mm) of shoulders of the rotating tools, and joining speed JS (mm / min), expressed as RS×D3 / JS, satisfy the relationship of the following Expression (8), 4×TJ≤D≤10×TJ . . . (7), and 180×TJ≤RS×D3 / JS≤1500×TJ . . . (8).

The invention belongs to the technical field of inertia friction welding of high-temperature alloy thin-wall parts, and particularly relates to a homogenized grain type inertia friction welding device and method. The device comprises a base, an inertia friction welding rotation driving mechanism, a supporting shaft assembly, a synchronous vibration and shaping coupling mechanism and an inertia friction welding axial feeding mechanism, and the inertia friction welding rotation driving mechanism, the supporting shaft assembly, the synchronous vibration and shaping coupling mechanism and the inertia friction welding axial feeding mechanism are arranged on the base. The output end of the inertia friction welding axial feeding mechanism is connected with the fixed chuck, and inertia friction welding is conducted on workpieces on the upsetting side and the rotating side through axial feeding. One end of the supporting shaft assembly is connected with the base, the other end of the supporting shaft assembly is rotationally connected with the flywheel, and the supporting shaft assembly is used for supporting and preheating workpieces. The synchronous vibration and shaping coupling mechanism is arranged on the outer side of the welding seam area and used for conducting deformation suppression and grain refinement control on the welding seam area. According to the method, joint grains are refined uniformly, the forming precision is high, near-net forming is achieved, and the production efficiency is high.

The utility model belongs to the technical field of friction stir welding automatic tool changing, and particularly relates to a mechanical main shaft machine head device suitable for friction stir welding equipment. The automatic tool changing device comprises a mechanical main shaft capable of automatically changing a tool, a pipeline rotating mechanism used for containing a pipeline of the mechanical main shaft and a C-axis mechanism enabling the mechanical main shaft to steer, the C-axis mechanism comprises a twistable C-axis sleeve, and the mechanical main shaft is arranged in the C-axis sleeve in a sleeved mode. The pipeline rotating mechanism is fixedly mounted on the C-axis sleeve and rotates along with the rotation of the C-axis sleeve, so that a pipeline on the mechanical main shaft is twisted by + / -360 degrees through the pipeline rotating mechanism; a shaft shoulder and a welding tool are installed at the bottom of the mechanical spindle. The mechanical spindle automatic replacement welding tool is adopted, namely, the mechanical spindle with an automatic tool loosening and pulling function in the market is adopted and combined with a pipeline rotating mechanism, automatic replacement of a movable shaft shoulder welding tool with an inclination angle is achieved, and the mechanical spindle automatic replacement welding tool can also be applied to a static shaft shoulder.

The invention discloses a high-performance heterogeneously-welded special-shaped combustion chamber piston and a preparation method thereof, a special-basin-shaped combustion chamber and an oil duct structure are directly formed through a rolling process, and heterogeneously-connected between a head part and a skirt part of the piston is realized in combination with a nitrogen protection friction welding technology. The piston head is made of low-silicon high-chromium ferrite-based alloy, the skirt is made of quenched and tempered steel, non-quenched and tempered steel or nodular cast iron, and the welding face is designed to be in a wave shape so as to enhance the bonding strength. The preparation process comprises vacuum smelting, multi-pass rolling, precise welding and surface treatment, the combustion efficiency, the lightweight level and the reliability of the piston are remarkably improved, and the piston is suitable for high-load working conditions such as diesel engines and natural gas engines.

The invention relates to the technical field of friction stir welding, in particular to a friction stir welding temperature control method, system and equipment and a medium. The temperature control range value is calculated according to the material melting point; temperature distribution data of the advancing side, the retreating side, the stirring area core and the shaft shoulder action area are collected and divided; comparing the real-time temperature characteristic with the control range value to judge that the temperature is abnormal; calculating a stirring head rotation speed adjustment amount, an axial pressure change amount, and a welding travel speed correction value based on the abnormality determination result; when parameter adjustment is executed, torque and temperature field changes are monitored, and temperature control execution data are obtained; and finally, accurate regulation and control of the temperature field are realized through the control system. Accurate identification of temperature abnormity and accurate control of a local area are realized, and a closed-loop control mechanism based on torque monitoring is established.

The invention discloses a weldless integral high-strength feeding drill rod and a preparation method thereof. The drill rod comprises a female connector, an elevator groove, a thick-wall slip clamping section, a drill rod pipe body and a male connector which are integrally formed and have the same inner diameter. The drill rod is manufactured by integrally machining a solid bar or a thick-wall pipe body. The yield strength of the drill rod pipe body, the yield strength of the thick-wall slip clamping section and the yield strength of the elevator groove are 135 ksi-180 ksi, and the yield strength of the male connector and the yield strength of the female connector are 130 ksi-150 ksi; the outer diameter of the thick-wall slip clamping section is larger than that of the drill rod pipe body; the outer diameter of the elevator groove is smaller than that of the clamping section of the thick-wall slip; the outer diameter of the elevator groove is not smaller than that of the drill rod pipe body. The outer diameter of the connector does not need to be obviously increased, meanwhile, enough elevator lifting capacity is guaranteed, and the problem of poor structure performance caused by friction welding seams and welding area heat treatment is avoided. Complicated welding, postweld heat treatment and other procedures are omitted, the possibility that a weld joint serves as a performance weak link is avoided, higher comprehensive tensile mechanical performance is achieved, and the method is suitable for well drilling application of extra-deep wells, ocean deep wells and the like.

The invention relates to the technical field of friction welding machines, and discloses a friction welding machine sliding table control method and device.The method comprises the following steps that movement data of a friction welding machine stirring head are collected in real time, and a stirring head kinetic model is established; based on the mobile data and the dynamic model, outputting a preliminary control strategy through an optimal linear quadratic regulation control algorithm; on the basis of the movement data, future movement data of the stirring head are predicted through a prediction control algorithm, and a preliminary control strategy is optimized; a control signal is sent to a servo motor of the sliding table to control the servo motor; and the difference between the real-time movement data of the stirring head and the prediction result is used as feedback data, and control strategy parameters are adjusted. According to the method, the difference between the real-time movement data of the stirring head and the prediction result is used as feedback, a closed-loop control mechanism is formed, and control parameters are continuously monitored and optimized. The position control precision of the stirring head is improved, the problem of response lag in high-speed welding is effectively solved, the consistency of welding line tracks is ensured, and position deviation is avoided.

A friction stir welding apparatus includes a hollow stirring bar, a clamping mechanism, a welding machine main shaft, a supporting carriage, a cooling system, a coolant tank, a guide rail, and pipes. The cooling system is connected with the outer surface of the welding machine main shaft through two sealed bearings; the clamping mechanism is connected with the welding machine main shaft; the clamping mechanism clamps one end of the stirring bar; the other end of the stirring bar penetrates the welded workpiece to engage with the supporting carriage; the guide rail is installed below the supporting carriage; the pipes includes a first pipe and a second pipe; one end of the first pipe is connected with the outlet of the tank, and the other end of the first pipe is connected with the inlet of the cooling system. The second pipe returns the cooling medium to the tank.

The invention provides a friction welding method and a connection structure. A conical bonding pad connects a far-end component and a near-end component with a conical hole for accommodating the conical bonding pad; the method comprises the following steps: clamping the clamping end; during primary forging, the clamping device is controlled to drive the conical bonding pad to rotate for the primary forging time length at the primary forging rotating speed, the pressure jacking device jacks the contact end towards the direction of the far-end component at the primary forging pressure, and the bonding pad rubs against the far-end component; the initial forging rotating speed is 5%-45% of the theoretical range, the initial forging pressure is 55%-95% of the theoretical range, and the initial forging duration is 5%-45% of the theoretical range; during finish forging, the rotating speed of the clamping device is controlled to be zero, the pressure jacking device jacks the conical bonding pad towards a far-end component for finish forging duration and extrudes melt under finish forging pressure, the finish forging pressure is larger than the initial forging pressure, the welding power is reduced in a low-speed short-time and certain-high-pressure mode, the welding equipment is made to meet the requirements for miniaturization and light weight, field operation can be conducted, and the welding efficiency is improved. The melt is extruded from the side face of the conical bonding pad, impurity discharge is promoted, and the welding quality is improved.

The invention provides a friction stir welding seam intelligent correction method based on visual identification, and relates to the technical field of friction welding. Image information of a welding seam area of a to-be-welded workpiece is collected in real time, image feature points are recognized, and the spatial pose of the welding seam area is obtained through a spatial transformation model; based on the space position deviation of the actual space pose and the theoretical welding track, a dynamic deviation correction path is generated; and a multi-point iterative optimization algorithm of motion control parameters and a real-time feedback control method are further adopted, so that high-precision real-time adjustment and dynamic compensation of the welding seam track are realized. According to the method, the accuracy and the stability of friction welding seam deviation rectification are remarkably improved.

A method of joining polymer-lined pipe sections end-to-end comprises friction welding a polymer liner bridge fitting to parent liners of the pipe sections and welding metallic outer pipes of the pipe sections to each other before, during or after the friction welding operation. The fitting may be engaged telescopically with the pipe sections in socket formations formed by the parent liners. Friction welding is effected by relative rotational movement between the fitting and the pipe sections about a common longitudinal axis. A spinning tool is advanced longitudinally within at least one of the pipe sections, inserted into the fitting, anchored within at least one of the pipe sections, engaged with the fitting and rotated to effect the relative rotational movement. This friction-welds the fitting to the parent liners simultaneously at interfaces located at respective ends of the fitting.

The utility model relates to the technical field of pipeline processing, in particular to a rotary friction welding device for a large-pipe-diameter pipeline, which comprises a placing frame, the pipeline is placed on the placing frame, a pipeline clamping mechanism is installed at the front end of the placing frame to clamp the pipeline and align to a joint, and the joint is clamped in a joint profiling welding tool and is driven by a welding standard machine to rotate and feed. A tail plate is arranged at the rear end of the placing frame, the tail plate moves at different positions of the track to be connected with the pipeline in a clamping mode, pipeline products of different lengths are welded, a connector profiling tool opposite to the connector profiling welding tool is arranged on the tail plate, and the connector profiling tool is matched with the connector profiling welding tool to adjust the relative angle of connectors welded to the two ends of the pipeline. The situation that the installation condition of a client cannot be met due to too large relative angle deviation is prevented; the welding device is used for solving the problem of welding of the pipeline and the connector, welding of the pipeline and the connector can be rapidly achieved at low cost, and the installation requirement and the market requirement of the energy storage pipeline are met.

The invention relates to the technical field of welding, and discloses a friction stir welding control method and equipment, and the method comprises the following steps: establishing a multi-physical field model, collecting data in real time, estimating an internal state through data assimilation, predicting future evolution, and adopting model prediction control to determine and apply an instruction; carrying out online learning on continuous adjustment model or control strategy parameters; the system comprises a model establishment module, a data acquisition module, a state estimation module, a state prediction module, a control decision and execution module and an online learning module. According to the method, the internal state is accurately estimated online through model and data assimilation, and the sensing precision is improved; realizing prospective adjustment based on state prediction and model prediction control; a multi-target cost function is introduced to intelligently balance multi-dimensional performance; an online learning mechanism is integrated, and the adaptability and robustness of the system are enhanced; a complete intelligent closed-loop control system is constructed, and the automation and intelligence level is improved.

The invention discloses a friction stir welding process for a copper-aluminum alloy. The friction stir welding process sequentially comprises the steps of pressing, dotting, plug mounting, clamping, welding and plug dismounting. The combination problem caused by material difference is solved through negative clearance close fit and hydraulic press fit of the copper part bulge and the aluminum part groove; a wide supporting surface plug with a heat insulation layer is adopted to prevent welding collapse; a preset tool ensures stable clamping; the preset stirring head design improves the fusion depth and material mixing effect; and the welding seam performance is guaranteed through post-welding treatment and multi-dimensional detection. According to the process, the limit of copper-aluminum double-sided friction stir welding is overcome, and the requirements of a liquid cooling heat dissipation system and other harsh scenes for sealing performance, strength and corrosion resistance are met.

A friction stir welding device includes: a pin extending along an axis; a shoulder having a cylindrical shape and coaxially surrounding an outer periphery of the pin; and a driver that allows the pin and the shoulder to rotate about the axis and to advance and retract along the axis individually. The shoulder includes a shoulder main body having a distal end to be plunged into a welding target, and a shoulder adapter having a fit hole in which a proximal end of the shoulder main body is shrink-fitted and connecting the shoulder main body and the driver to each other.

The utility model discloses a friction welding tool for a water cooling plate of a new energy battery box body, which comprises a base, a welding platform with a rectangular structure is arranged in the middle of the base, the welding platform is used for placing the water cooling plate, and top pressing components positioned on the periphery of the welding platform are distributed on the base. Each top pressing assembly can exert downward pressure on the circumferential edge of the water-cooling plate so that the water-cooling plate can be pressed on the top of the welding platform, a limiting assembly and a horizontal pushing assembly are arranged at the two opposite ends, corresponding to the welding platform, of the base correspondingly, and after the water-cooling plate is installed on the welding platform, the limiting assembly abuts against one end of the water-cooling plate, and the horizontal pushing assembly abuts against the other end of the water-cooling plate. The horizontal pushing assembly can apply pushing force in the horizontal direction to the other end of the water cooling plate. The water cooling plate friction welding device has the beneficial effects that through the arrangement of the horizontal pushing assembly and the limiting assembly, force can be additionally applied to the water cooling plate in the horizontal direction, the friction welding can be more stable in cooperation with downward force applied by the top pressing assembly, and then the overall air tightness of the water cooling plate after welding is guaranteed.

The invention discloses a linear friction welding device and method for simultaneously welding three plates. The linear friction welding device comprises a workbench, a two-side fixing and clamping device, a pressure loading and control device, a middle plate clamping device and a middle plate driving device. The two side fixing and clamping devices symmetrically fix two side plates, the middle plate clamping device fixes a middle plate and moves along with the driving device, the pressure loading and control device drives the two side plates to be attached to the middle and apply pressure, and the middle plate driving device drives the middle plate to do high-frequency linear reciprocating motion. The method comprises the steps of fixing plates on the two sides, clamping a middle plate, driving the plates on the two sides to be attached to the middle plate, driving the middle plate to reciprocate, applying pressure, completing welding, unloading, loosening and the like, and synchronous forming of the double welding seams is achieved. According to the method, the problems of low multi-plate welding efficiency and poor quality of a traditional process are solved, the welding efficiency and the joint consistency are improved, and the method is suitable for multi-layer composite plate machining in the field of aviation, nuclear energy and high-end equipment manufacturing.

The invention provides a method for inhibiting abnormal grain growth of a 7xxx series aluminum alloy friction stir welding joint, which comprises the following steps: step 1), performing wire filling welding treatment on a to-be-welded aluminum alloy part to obtain a welding part; wherein the welding flux is an aluminum alloy containing a scandium element; (2) the welding part is subjected to friction stir welding treatment, and a friction stir welding head is obtained; and (3) post-treatment is conducted on the friction stir welding head. Welding materials used are characterized in that a certain amount of scandium is added, then differential friction stir welding treatment is carried out, the differential friction stir welding treatment is carried out by independently regulating and controlling the rotating speed of a shaft shoulder and the rotating speed of a stirring needle, and on the premise that the rotating speed of the stirring needle is greatly increased to improve material flowing, the welding efficiency is greatly improved. The low shaft shoulder rotating speed is applied to eliminate overheating, defects are avoided, pinning particles are dispersed, and the effect of completely inhibiting growth of abnormal crystal grains is achieved.

The invention discloses a friction stir welding closed type vacuumizing, heating and cooling shoe-shaped mold which mainly comprises an upper mold, an upper mold inner-layer flow channel welding sealing piece, an upper mold flow channel outer-layer welding sealing plate, a lower mold, a lower mold upper flow channel welding sealing plate, a lower mold lower flow channel welding sealing plate and a lower mold vacuumizing welding sealing plate. And the mold can be mounted on universal oil pressure equipment in the market for use through the bolt hole positions. And the upper mold is heated and cooled, and fluid enters from the upper mold runner inlet hole, the upper mold upper-layer runner and the upper mold lower-layer runner inlet hole, flows into the upper mold lower-layer runner, then flows back to the upper mold upper-layer runner from the upper mold lower-layer runner outlet hole, and flows out from the upper mold runner outlet hole. And the lower mold is heated and cooled, and fluid enters the lower mold upper runner from the lower mold runner inlet hole, flows to the lower mold vertical hole runner and the lower mold lower runner, and flows out from the lower mold lower runner outlet hole. According to the vacuumizing structure, a vacuumizing air hole in the bottom of a lower mold forming cavity is communicated with a lower mold vacuumizing hole air groove, a vacuumizing air hole in the side face of the lower mold forming cavity is communicated with a lower mold vacuumizing vertical air groove, and the lower mold vacuumizing vertical air groove is communicated with the lower mold vacuumizing hole air groove and a vacuumizing air exhaust hole. And air in the forming cavity of the lower mold is extracted outwards through the vacuumizing and air extracting hole.

The invention relates to the technical field of high-end equipment manufacturing, in particular to a friction stir welding system pressure control method and system, electronic equipment and a storage medium, and the method comprises the steps that real-time sensor data in the welding process is obtained, and a controller preset algorithm module is used for analyzing and processing to obtain a real-time pressure value; and meanwhile, a plurality of modules such as a self-adaptive control algorithm module, a pressure prediction model, an online parameter identification model, a multi-mode switching module, an abnormal prediction model and an equipment health state evaluation model are further arranged to realize dynamic adjustment and control. The effects that the working pressure value of the friction stir welding system can be continuously and dynamically adjusted, the welding process is kept stable, self-adaptive control and precise control are achieved, the welding quality stability is improved, abnormity is early warned, parameters are adjusted, and the fault-tolerant threshold value is dynamically adjusted to maintain the control precision are achieved.

A friction stir welding device includes: a pin extending along an axis; a shoulder having a cylindrical shape and coaxially surrounding an outer periphery of the pin; and a driver that allows the pin and the shoulder to rotate about the axis and to advance and retract along the axis individually. The shoulder includes a shoulder main body having a distal end to be plunged into a welding target, and a shoulder adapter having a fit hole in which a proximal end of the shoulder main body is shrink-fitted and connecting the shoulder main body and the driver to each other.

The invention provides a friction welding process control method and system for a tail lamp support, and relates to the technical field of friction welding, and the friction welding process control method comprises the steps that a multi-mode sensing unit is integrated at the tail end of a welding mechanical arm, comprises a six-dimensional force sensor and a thermal infrared imager, and is connected to a control middle table through an industrial real-time Ethernet protocol; in the beat synchronous reciprocating welding machining process, multi-physics field coupling data low-delay uploading is carried out; welding control offset prediction is carried out, and a six-degree-of-freedom pose offset vector is output; solving the joint angle compensation amount, and correcting the joint space of the welding mechanical arm; performing time sequence accumulation analysis, and outputting a look-ahead intervention compensation parameter; and performing joint space dynamic intervention compensation. The technical problems that in the prior art, a real-time feedback and dynamic compensation mechanism is lacked, welding deviation cannot be effectively corrected to a certain degree, the welding process cannot be efficiently completed, and the production cycle and the production cost are affected are solved.

The invention relates to the technical field of radiator welding processes, and discloses a welding process for a needle plate type radiator with a cavity, which comprises the following steps: S1, pretreating the surface of a weldment, removing impurities, oil stains and oxide layers on the surfaces of a radiating needle plate, a bottom plate and the cavity, S2, assembling a needle surface brazing sheet, and S3, constructing a friction stir welding sealing cavity. The heat dissipation needle plate and the bottom plate are welded, S4, needle face brazing operation is carried out, S5, appearance visual inspection and verification are carried out, and S6, performance comprehensive detection is carried out. Through FSW welding, the heat dissipation needle plate and the bottom plate (with the cavity) can be connected more tightly and reliably, the airtight yield is effectively improved, the leakage risk of a product is greatly reduced, the sealing performance of the cooling cavity in the long-term use process is ensured, stable operation of a heat dissipation system is guaranteed, meanwhile, the FSW welding process period is short, and the production efficiency is improved. And compared with traditional brazing, a large amount of production time can be saved, and production efficiency is improved.

The utility model relates to the technical field of friction stir welding, and provides a friction stir welding pressing mechanism which comprises a base and a vertical frame, the vertical frame is arranged on the surface of the base, a mounting platform is arranged on the base, an adjusting assembly is arranged between the base and the mounting platform, and a welding equipment body is arranged on the vertical frame. The driving assembly is arranged between the welding equipment body and the vertical frame, the correcting and pressing assembly is arranged at the top of the mounting platform and comprises a transverse frame, the transverse frame is fixed to the surface of the mounting platform, a pair of telescopic air cylinders is arranged on the surface of the transverse frame, and the output ends of the telescopic air cylinders are connected with a lower pressing plate. By means of the technical scheme, the problems that in the prior art, a clamp, a pressing plate and other modes are generally adopted for fixing the welded workpiece in existing friction stir welding, however, the method can only clamp the periphery of the welded workpiece, when the surface of an aluminum alloy plate is uneven, deviation is likely to happen in the clamping and welding process, and therefore the welding quality is affected are solved.

The invention discloses a friction welding bead offset detection method, friction welding equipment and a workpiece. The friction welding bead offset detection method comprises the steps that a target workpiece is placed on an XY moving platform, and the target workpiece is provided with a first detection symbol and a second detection symbol; the XY moving platform, the Z-axis mechanism and the C-axis mechanism are used for controlling a stirring needle to conduct friction stir welding on the target workpiece, so that a friction welding bead is formed on the target workpiece; controlling the stirring needle to perform primary dotting on the first detection symbol so as to form a first detection point on the target workpiece; the stirring needle is controlled to perform secondary dotting on the second detection symbol so as to form a second detection point on the target workpiece, and the difference value of the C angle parameter of the C-axis mechanism between the primary dotting and the secondary dotting is 180 degrees; and according to the first detection symbol, the first detection point, the second detection symbol and the second detection symbol, friction welding bead offset detection is conducted, and an offset detection result is obtained. According to the invention, offset detection can be carried out on the friction welding bead in a non-destructive manner.

The invention discloses a linear friction welding machine vibration compensation control method based on iterative learning, and the method comprises the steps: collecting a vibration signal of an electro-hydraulic servo vibration system of a linear friction welding machine in a welding process, determining a vibration amplitude, frequency and vibration center deviation, and when the vibration amplitude or the center deviation exceeds a preset threshold value, starting the linear friction welding machine; the controller starts vibration compensation control; an electro-hydraulic servo vibration system model is established, the rigidity characteristic and the dynamic load change of the system are comprehensively considered, an iterative learning control law of a controller is designed, and control convergence conditions are analyzed to ensure the stability and the high efficiency of control; based on the output of the controller, the error trend of the vibration signal is predicted in real time in combination with historical iteration data, and a feed-forward control signal is generated through a feed-forward compensation mechanism to adjust the vibration signal error in advance. According to the method, the iterative learning is applied to the vibration compensation control of the linear friction welding machine, so that the precise compensation of the vibration signal is realized.

The invention provides a friction stir welding aluminum alloy I-shaped beam pressure limp bearing capacity design method which comprises the following steps: acquiring key parameters of a friction stir welding aluminum alloy I-shaped beam test piece, including section size information, structural design parameters, material mechanical property indexes, welding seam parameters and geometric initial defects; calculating dimensionless parameters based on the key parameters; calculating a pressure limp bearing capacity theoretical value of the transverse stiffening rib-free aluminum alloy I-shaped beam when the transverse stiffening rib-free aluminum alloy I-shaped beam is subjected to concentrated load in the midspan according to European specifications or an American aluminum coordination design manual; real pressure limp bearing capacity data of the stirring friction welding aluminum alloy I-shaped beam are obtained through experimental testing and finite element simulation, and a correction coefficient is obtained through regression analysis fitting based on the real pressure limp bearing capacity data and dimensionless parameters; and the correction coefficient is multiplied by a standard theoretical value, or an American standard formula based on least square method regression correction is adopted, and the pressure limp bearing capacity design value of the friction stir welding aluminum alloy I-shaped beam is obtained.

Herein is disclosed a friction stir welding tool assembly comprising: a substrate having a substrate end; a tip having a tip end; and an interlayer between the substrate end and the tip end; wherein the tip further comprises a stirring pin, the stirring pin being located at a distal end to the tip end; and wherein the tip is formed of a first superhard material, and a use of the friction stir welding tool assembly in a friction stir welding process.

The invention discloses a friction stir welding online testing method and system, a product and a medium. The method comprises the following steps: acquiring a motion trail of a welding tool, identifying steering sections, and calculating steering angles of the steering sections at the same time; for each steering section, calculating the length difference of an inner side path and an outer side path based on the diameter of a welding tool and a steering angle, thereby obtaining an action difference coefficient representing the non-uniform stress degree of a material, and determining compensation starting time and a compensation inclination angle in combination with the position of the steering section; when entering a real-time steering section, acquiring a compensation inclination angle of a preorder steering section and a residual distance between the two sections, calculating a residual compensation amount of the preorder steering section by adopting an attenuation exponential function, and determining whether to increase or decrease a real-time compensation inclination angle according to the difference between the directions of the preorder steering section and the real-time steering section; and finally obtaining a real-time correction compensation inclination angle to control the posture of the welding tool. By implementing the technical scheme provided by the invention, the uniformity of the welding seam quality in the friction stir welding process under the complex curve track is improved.