262 results about "Arc voltage" patented technology

The invention discloses a gradient welding strength control method and system for a welded galvanized steel pipe for fire fighting, particularly relates to the technical field of welding automation control, and aims to solve the problem of abnormal welding seam strength gradient caused by instantaneous unbalance of an electric field and a thermal field during dynamic parameter switching in the prior art. Electromagnetic distortion characteristic quantity is extracted through frequency domain energy analysis, and thermodynamic offset state quantity is deduced in combination with a thermal diffusion trend; on the basis of frequency band correlation mapping of electromagnetic and thermodynamic parameters, thermoelectric cooperative imbalance levels are divided through mutual information entropy evolution, and a self-adaptive harmonic attenuation weight tuning instruction is generated; analyzing a mismatching relation between transient disturbance of an environment magnetic field and arc voltage modulation distortion in real time, dynamically generating a magnetic field compensation factor and reversely superposing the magnetic field compensation factor to a control instruction; and in combination with the matching degree of molten pool oscillation energy and a harmonic frequency spectrum, correcting wire feeding rate calibration, reconstructing a multi-band harmonic energy proportion spectrum, outputting an anti-interference welding control signal, and realizing dynamic balance between arc stability and molten pool heat input.

The invention provides a self-adaptive teaching-free welding robot intelligent gas saving monitoring system, which relates to the technical field of industrial robots, and comprises a three-dimensional sensing module used for identifying the workpiece material category through a multispectral sensor integrated with a welding gun of a welding robot, meanwhile, a stereoscopic vision camera and a line structure light scanning camera are used for obtaining three-dimensional point cloud data of the welding seam in real time; the parameter adjusting module is used for calling a heat conductivity coefficient database based on the three-dimensional point cloud data, and correcting the initial flow of the welding current, the arc voltage and the protective gas in real time; and the matching control module is used for calculating the arc length variable quantity based on the arc voltage, controlling the opening degree of the gas flow valve through a dynamic regulator, realizing dynamic matching of the gas flow and the changed arc length, and generating gas dynamic matching control parameters. Through cooperative operation of self-adaptive attitude compensation and real-time gas consumption monitoring, teaching-free accurate operation in the welding process is achieved, and intelligent control over gas consumption is improved.

The invention relates to the technical field of metal welding automation control, in particular to a metal welding seam automatic tracking welding system based on machine vision. Comprising a data acquisition module used for acquiring initial three-dimensional geometric parameters of a welding seam and monitoring welding process parameters including welding current, arc voltage and welding speed; the thermal deformation prediction module is used for solving a weld joint thermal deformation displacement vector; the dynamic deviation evaluation module is used for calculating a dynamic deviation index; the risk grading module is used for judging the trajectory deviation risk as safety, first-level risk or second-level risk; the defect tendency prediction module is used for calculating an incomplete fusion index and a hot crack index; the comprehensive risk assessment module is used for determining a comprehensive process risk factor; and the track correction module is used for generating a corrected welding gun target track so as to carry out closed-loop correction control on the welding process. According to the method, the problem of trajectory deviation caused by thermal hysteresis and dynamic deformation is solved, and the tracking precision and stability of the welding path are remarkably improved.

The invention discloses an arc fault detection method and device based on voltage time difference variation, and belongs to the technical field of low-voltage power distribution network fault protection, and the method comprises the steps: enabling an arc fault point to be equivalent to an arc voltage source, and employing an arc voltage change rate and an arc voltage effective value, establishing detection feature description of a fault waveform generated by the arc voltage source, wherein the fault waveform presents a square-wave-like waveform; sampling adjacent cyclic wave voltages of a load side monitoring point, performing feature identification on the tail end voltage difference between adjacent cyclic waves based on detection features, and identifying a first fault waveform; and after the first fault waveform occurs, performing continuous identification counting on the arc faults, realizing identification of the continuous arc faults by using the difference between the non-fault waveform before the fault occurs and the waveform to be identified, and confirming the occurrence of the arc faults. The detection method is good in reliability, clear in physical significance, high in detection sensitivity, not affected by line parameters, capable of achieving detection only through a single monitoring point and lower in cost.

The provided are a method, system, and medium for active arc-extinguishing voltage-current conversion in distribution networks. The method includes: detecting a single-phase-to-ground fault in the distribution network and identifying the target faulty phase; injecting compensating currents into the target faulty phase to reduce its voltage; measuring the residual current at the fault point during the injection of compensating currents and the zero-sequence voltage of the target faulty phase; determining a critical zero-sequence voltage threshold based on the residual current at the fault point and assessing whether this critical value exceeds the present zero-sequence voltage; if so, ceasing the injection of compensating currents into the target faulty phase and instead injecting active arc-extinguishing currents at the neutral point of the distribution network to mitigate ground currents at the grounding points of the distribution network. The objective is to enhance the applicability of arc-extinguishing methods for ground faults in distribution networks.

The invention discloses a welding robot self-adaptive wire feeding control method, a platform and a medium, relates to the technical field of welding automation process control, and is suitable for welding process management under complex working conditions. According to the method, an arc voltage sequence and a molten pool characteristic parameter sequence in the welding process are collected, a welding state characteristic value is obtained through calculation, a reference database containing welding process parameters, welding working condition parameters and the welding state characteristic value is constructed based on historical experimental data, and corresponding preset reference indexes are generated through a mapping relation function; and in real-time welding, the welding state characteristic value of the current wire feeding control period is obtained and compared with a preset reference index, the deviation value is calculated, the welding state is judged according to the grading threshold value interval, the wire feeding speed is dynamically adjusted, and self-adaptive matching of the wire feeding speed and the welding state is achieved. According to the method, instability caused by traditional adjustment depending on experience can be overcome, dynamic control over the welding process is achieved, and the stability of a welding pool and the welding seam forming quality are improved.

The invention relates to the technical field of electrical variable monitoring, and further relates to a pole-mounted circuit breaker electrical variable monitoring method. The method comprises the steps of 1, collecting a plurality of real-time electrical variables of the pole-mounted circuit breaker, performing normalization processing on each real-time electrical variable, and performing nonlinear fusion to form a single-dimensional electrical variable observation sequence; 2, acquiring historical sampling values of multiple electrical variable observation sequences within a fixed time delay interval so as to avoid embedding dimension explosion caused by vector operation and explicitly reflect a low-dimensional manifold hypothesis; and step 3, performing combined mapping on the intrinsic state quantity and the difference value of the insulation leakage current and the arc voltage, and predicting the fracture phase voltage in the future time. According to the invention, high-precision, high-robustness and prospective localized fault early warning and protection control can be realized, and the intelligent monitoring and safe operation capability of the pole-mounted circuit breaker in a complex power distribution environment can be obviously improved.

The invention relates to the technical field of welding automation, and discloses an intelligent welding system for an electric pole steel reinforcement framework. The system comprises a welding execution module, a multi-mode sensing module, an edge calculation module, a real-time regulation and control module and a system control center. Synchronous collection and real-time analysis of images, temperature and sound signals of a welding pool area are achieved, so that defects such as air holes, slag inclusion and incomplete fusion can be recognized online in a key time window when the welding pool is not solidified, and time delay caused by a traditional off-line detection mode is thoroughly eliminated. Through a real-time regulation and control module, on the basis of a multi-target optimization decision and parameter self-adaptive adjustment mechanism, the system can dynamically adjust key process parameters such as welding current, arc voltage and welding speed at the moment of identifying defect germination or process deviation, and real-time intervention and closed-loop control on welding quality are achieved; therefore, the final formation of defect welding seams is avoided fundamentally, and the rework rate and the material waste are remarkably reduced.

The invention relates to the technical field of ammeter fault detection, and provides an intelligent ammeter series arc fault detection method, system and device, a medium and equipment, and the method comprises the steps: firstly obtaining an ammeter data set of an intelligent ammeter, which comprises a pre-ammeter voltage, a post-ammeter voltage and a total loop current in a continuous power frequency period, and then carrying out the division through a sliding time window, obtaining a plurality of ammeter data windows; for each window, calculating a voltage difference sequence and a dynamic loss impedance sequence; when the absolute value of the total loop current is smaller than a preset threshold value, determining the current zero-break interval of each power frequency period and the current zero-break time corresponding to the window; determining an arc voltage estimation value according to a voltage difference between non-zero-break intervals in the zero-break interval; and finally, integrating the current zero break time, the arc voltage estimated value and the dynamic loss impedance of each window to judge whether a series arc fault exists, and if so, triggering a protection action. According to the embodiment of the invention, high-reliability identification of the series arc fault is realized.

The invention discloses a laser-assisted helium arc penetration fusion welding method, and belongs to the technical field of welding. The problems that according to an existing paraxial laser-electric arc composite structure, the welding track is difficult to control, the energy coupling efficiency is low due to laser energy loss, and weld joint partial melting and undercut defects are caused due to uneven distribution of a welding temperature field due to a generated asymmetric heat source are solved. The welding method comprises the steps of 1, pretreatment; 2, after being focused by a focus lens, the laser is divided into three laser beams through a spectroscope, then the three laser beams are converged again through a plurality of reflectors, three fan-shaped light spots are formed on the surface of the to-be-welded plate after convergence, and finally the focal plane position of the laser is adjusted to be located on the surface of the to-be-welded plate; 3, setting welding current and arc voltage; and fourthly, laser is used for assisting helium arc penetration fusion welding. The method is used for laser-assisted helium arc penetration fusion welding.

The invention belongs to the technical field of smelting furnace intelligent control, and particularly relates to an intelligent smelting furnace for titanium alloy heating, which comprises a data acquisition module, an arc stability judgment module, a position adjustment control module and a feedback adjustment module. And the voltage and current variation coefficient weight design is dynamically adjusted based on the electrode consumption height, the change of the current fluctuation sensitivity after electrode consumption is adapted, real-time accurate quantitative evaluation of the arc stability is realized, the abnormal state of the consumable electrode can be timely and accurately identified, and through the morphological characteristics of the molten pool and the arc deviation characteristics, the arc quality is improved. According to the method, an adjustment vector containing height and transverse displacement is generated, the smelting defects such as molten pool writhing, local overheating and component segregation caused by insufficient adjustment pertinence are avoided, finally, weight distribution and adjustment coefficients are dynamically optimized through a feedback mechanism, and the electric arc stability control and adjustment accuracy is remarkably improved.

The present invention proposes a digital twin model of a low-voltage AC arc, comprising: an arc physical experiment platform and a COMSOL arc simulation model; the interaction mapping of arc information between the virtual and real platforms of the arc is carried out with the wavelet energy spectrum eigenvalue of the arc voltage; by collecting the characteristic data of the arc voltage change in the arc physical experiment, the parameters of the simulation model are dynamically corrected to make the simulation model closer to the actual movement process of the arc, and the results obtained from the simulation model are fed back to the physical platform of the arc experiment.

The invention discloses a modeling method and system for a vehicle network field circuit coupling model under a contact line short-circuit working condition, and relates to the technical field of modeling, and the method comprises the following steps: constructing a short-circuit arc equivalent model under the contact line short-circuit working condition based on an isolation switch equivalent model, one end of the short-circuit arc equivalent model is connected with a contact line in sliding connection with a pantograph in the chain type lumped tau-shaped network model through a switch element, the other end of the short-circuit arc equivalent model is connected with a steel rail in the chain type lumped tau-shaped network model, and a vehicle network circuit model under the contact line short-circuit working condition is obtained; and taking the short-circuit arc current at any short-circuit phase obtained through simulation of the vehicle network circuit model as a current excitation source of the three-dimensional model, and obtaining a vehicle network field model under the contact line short-circuit working condition. The rise rate, peak value and attenuation process of the short-circuit current can be accurately simulated by adding the short-circuit arc, the arc voltage drop is reflected, and the authenticity and practicability of simulation are remarkably improved.

A converter station AC filter group circuit breaker abnormal arcing modeling analysis method comprises the following steps: firstly, carrying out time mark alignment, amplitude calibration and filtering de-noising on wave recording signals such as AC bus voltage and filter branch current to obtain high-quality input data; then, combining a primary wiring diagram, enabling an alternating current system to be equivalent to an ideal power supply and series impedance, enabling circuit breaker arcing to be equivalent to arc resistance changing along with time, and constructing an equivalent circuit model comprising the power supply, the impedance, a capacitor, an electric reactor and dynamic arc resistance; establishing a state space equation according to a voltage and current constraint relation, and performing time domain solution by adopting a two-step two-order or three-order diagonal implicit Runge-Kutta method to obtain voltage and current responses of the whole process of the fault; on this basis, the arc resistance change is inversed according to the ratio of arc voltage to current, the current zero passage is identified through the resistance symbol change at adjacent moments, and the zero passage section is smoothed; and finally, the inversion result is verified again by means of the simplified equivalent model.

The invention provides a circuit breaker contact ablation evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: collecting a test current and a mechanical stroke curve of a pull rod of a hydraulic mechanism of a to-be-tested circuit breaker in a breaking test process of the to-be-tested circuit breaker; collecting a first arc voltage waveform of a main contact and a second arc voltage waveform of an arc contact of the circuit breaker to be tested; evaluating the ablation state of the main contact by using the test current and the first arc voltage waveform; and evaluating the ablation state of the arc contact by using the first arc voltage waveform, the mechanical stroke curve and the second arc voltage waveform. According to the scheme, the ablation states of the main contact and the arc contact are evaluated through the test current, the mechanical stroke curve and the arc voltage waveform, the ablation states can be evaluated without enabling the circuit breaker to be separated from a normal working state or a test state, and the evaluation efficiency is improved.

The invention provides a ship direct current distribution board fuse setting method considering on-off arcing. Establishing a fuse breaking arcing model: describing a fuse arcing process based on a Cassie arc model, fitting test data through a genetic algorithm to establish a model parameter change rule, and establishing a relationship between a test loop resistance value and an arc voltage constant and an arc time constant through a BP neural network; the method comprises the following steps: calculating equivalent short-circuit impedance of a fault branch, and calculating a test loop impedance parameter which can be equivalent to a system short-circuit fault current waveform according to a short-circuit current peak proportional relation of a system and a test loop; and executing constraint driving type fuse setting: taking the condition that the rated current of the fuse is not less than the product of a safety margin coefficient and the maximum continuous working current of the branch and the total Joule integral value of the non-fault branch does not exceed 50% of the pre-arc Joule integral value as constraint conditions, and adopting a minimum pre-arc Joule integral value priority strategy, iteratively selecting the model from the minimum-scale branch group and expanding to a whole-system branch.

The invention discloses a surface arcing voltage prediction method based on an electric field feature set and a terminal. The method comprises the following steps: measuring a voltage data set of surface arcing voltage of an insulating material under different environmental factors through tests; constructing an electric field distribution simulation model of surface arcing based on the test parameters, outputting an electric field distribution original data set by the electric field distribution simulation model, and extracting a corresponding electric field feature set from each electric field distribution original data; and carrying out model training based on the voltage data set and the corresponding electric field feature set, and carrying out surface arcing voltage prediction by using a surface arcing voltage prediction model obtained by training, so that accurate and rapid prediction of the surface arcing voltage of the insulating material in the wet and dirty environment can be realized. And an effective technical support is provided for external insulation design and state evaluation of the electrical equipment.

The invention provides a motor controller, a power assembly, a power battery pack and a vehicle, the motor controller is used for receiving power supplied by a direct current bus through a direct current breaker, and the direct current breaker is used for connecting or disconnecting the connection between the direct current bus and the motor controller. Wherein the two ends of the direct current breaker are connected with a voltage clamping device in parallel, and the voltage clamping device is used for clamping the voltage at the two ends of the direct current breaker. The independent direct-current breaker is arranged between the power battery and the motor controller of the vehicle, and fault isolation is achieved by disconnecting the direct-current breaker when the motor controller is in the short-circuit fault. Moreover, the two ends of the DC breaker are connected in parallel with the voltage clamping device, so that the arc voltage generated when the DC breaker is disconnected is reduced, and the normal operation of other electric parts connected in parallel on the DC bus when the DC breaker is disconnected is further guaranteed.

The invention relates to the technical field of power system fault simulation, and discloses a DC fault simulation method for a medium-voltage DC system, and the method comprises the steps: constructing an equivalent circuit containing line distribution parameters, and representing the transmission characteristics of resistance, inductance and capacitance per unit length, a linear mathematical model of arc voltage and arc length is established based on arc discharge experiment data, a dynamic resistance curve is generated in combination with an arc length time increase function, an initial value and a change rate of dynamic resistance are extracted as characteristic parameters, and a mapping relation table of the characteristic parameters with metallic short circuit and mild / severe arc faults is established. And according to a target fault type, matching a dynamic resistance parameter, injecting the dynamic resistance parameter into an equivalent circuit, solving a differential equation containing a time-varying resistor, and outputting a high-fidelity DC fault current signal. The method solves the problem that static resistance simulation cannot reproduce arc dynamic characteristics, and significantly improves the accuracy of fault simulation.

The present invention discloses a circuit breaker arc simulation method considering the influence of ablation vapor diffusion and convection. The present invention includes performing coupled simulation on the circuit breaker by using magnetohydrodynamic simulation control equations and a plurality of initial user-defined functions to construct an initial arc dynamic model; performing rolling optimization on the initial arc dynamic model according to preset initial boundary conditions to obtain a target arc dynamic model; and performing arc simulation on the circuit breaker through the target arc dynamic model. The present invention solves the technical problem that multiple arc tests are required for the optimal design of circuit breakers in engineering practice, and the test cost is expensive. The arc simulation model of the present invention is universal for circuit breakers, and optimizes the accuracy of monitoring arc voltage and arc current.

The invention discloses a pulse welding droplet transition control method, system and device and a storage medium, and the method comprises the steps that a first pulse parameter of a main pulse and a second pulse parameter of a micro pulse for welding are initialized, and the micro pulse is used for being superposed on a peak stage of the main pulse to form a target pulse sequence; a pulse current waveform of the target pulse sequence is determined according to the first pulse parameter and the second pulse parameter, and target welding current is generated according to the pulse current waveform; the target metal material is welded according to the target welding current, and a real-time molten drop image and a real-time arc voltage are collected; determining the diameter deviation of the molten drop according to the real-time molten drop image, determining the arc voltage deviation according to the real-time arc voltage, and optimizing the first pulse parameter and the second pulse parameter according to the diameter deviation of the molten drop and the arc voltage deviation. The method improves the welding seam forming quality and the metal welding quality, and can be widely applied to the technical field of metal welding.

The invention discloses a welding power supply extension module integrating arc voltage tracking and welding machine control functions and a welding control method, and belongs to the technical field of electric arc welding. In order to solve the problems that arc voltage tracking and welding machine control are mutually independent and cannot cooperate in real time in the existing TIG welding process, so that the welding process is tedious in operation and unstable in quality, the system comprises a core processor for executing an arc voltage tracking control algorithm and a welding parameter adjusting algorithm; the signal conditioning circuit is used for collecting and conditioning a current signal and a voltage signal output by the welding power supply; the welding power supply control module is provided with a plurality of interface circuits used for being connected with welding power supplies of different interface types; the core processor receives state information of the welding process through the high-speed communication module and generates a first control instruction used for adjusting output parameters of a welding power source and a second control instruction used for adjusting the height of a welding gun according to the state information and current signals and voltage signals collected by the signal conditioning circuit. The method is used for electric arc welding.

The invention provides a CRDM middle omega welding seam automatic welding control system and method, and relates to the technical field of CRDM middle welding seam automatic welding. The automatic welding control system comprises a molten pool image module used for collecting molten pool images and obtaining the real-time width-depth ratio R of a molten pool; the arc voltage acquisition module is used for acquiring real-time arc voltage information; the wire feeding control module is used for controlling the wire feeding speed; the main control module is in signal connection with the molten pool image module, the data acquisition module and the wire feeding control module; wherein the main control module adjusts the height of the welding gun according to the real-time arc voltage information and the preset arc voltage information; the current is adjusted according to the real-time width-depth ratio R of the molten pool and the preset width-depth ratio Rmin of the molten pool; and controlling the wire feeding control module to adjust the wire feeding speed according to the adjusting current. High-precision adjustment of arc voltage, welding current, wire feeding speed and the like is achieved through closed-loop control, welding precision and welding quality are effectively improved, and high-precision welding of CRDM middle welding seams is achieved.

The present invention discloses a method for comprehensively evaluating the electrical life of a circuit breaker, which is specifically carried out according to the following steps: Step 1: Establish a magnetohydrodynamic simulation model according to the designed arc extinguishing chamber structure of the circuit breaker; Step 2: Obtain the spatio-temporal evolution characteristics, arc current, arc voltage, and let-through energy of the arc under different voltages and different current magnitudes through simulation calculations, and establish a database of the simulation results of the circuit breaker; Step 3: Calculate the electrical life of the new circuit breaker product: Calculate the remaining electrical life of the circuit breaker operating online. Thus, the comprehensive evaluation of the electrical life of different circuit breakers is realized. The present invention not only evaluates the electrical life parameters of new circuit breaker products theoretically, but also can evaluate the remaining electrical life times according to the real-time state of the circuit breaker, improving the accuracy of electrical life evaluation while saving costs. This method can be applied to low-voltage circuit breakers and can also be applied to high-voltage gas circuit breakers.

A unit pole of a double-breakpoint switch belongs to the technical field of low-voltage electric appliances. Comprising a shell, static contacts, a bridge-type moving contact, an arc extinguish chamber and a rotating shaft, the static contacts, the bridge-type moving contact, the arc extinguish chamber and the rotating shaft are located in the shell, the bridge-type moving contact is installed in the rotating shaft and comprises a pair of moving contact arms which extend out of the rotating shaft in a back-to-back mode, the static contacts are in a flat plate shape and are arranged on the top wall and the bottom wall in the shell respectively, and the arc extinguish chamber is arranged in the shell. The arc extinguish chambers are arranged in the shell and are in contact fit with the movable contact arms respectively, the movable contact arms form a < shape when making contact with the static contact, and the arc extinguish chambers are located on the left side and the right side in the shell respectively. The arc extinguish chamber has the advantages that the space occupied by the static contact in the shell is reduced, so that the space for placing the arc extinguish chamber can be increased, the arc extinguish chamber can obtain a larger space in the array direction of the grid sheets, more grid sheets can be stacked, the arc voltage can be improved, and the arc can be extinguished quickly; and meanwhile, the requirement of high-voltage breaking is met.

The invention relates to a high-voltage SF6 circuit breaker asymmetric short-circuit current breaking result prediction method, equipment and a medium. The method comprises the following steps: acquiring a plurality of groups of arc voltage and arc current test data obtained by performing a T100a test on a target circuit breaker under a first time constant; based on the test data, establishing a black box arc model, and fitting to obtain arc dissipation power and arc time constant corresponding to each group of test data through numerical solution and parameter optimization algorithms, thereby obtaining an on-off critical value; fitting is carried out in an arc breaking critical parameter fitting model, and values of a first parameter, a second parameter, a third parameter and a fourth parameter are determined; and obtaining a predicted value of an on-off value under the working condition through an arc on-off critical parameter fitting model, if the predicted value is greater than an on-off critical value, determining that on-off is successful, otherwise, determining that on-off is failed. Compared with the prior art, the method has the advantages of high accuracy, high practicability, simple process and the like.

The invention relates to the technical field of welding quality detection, and discloses an online detection system for welding quality. A welding area monitoring device of the system is arranged around a working area of welding equipment and used for capturing an optical radiation signal and a heat distribution signal in the welding process; the multi-source data acquisition device is connected with the welding area monitoring device and synchronously acquires welding current fluctuation data, arc voltage change data and wire feeding speed data; the real-time feature extraction device receives the multi-source data and constructs a welding process dynamic feature set; the dynamic analysis device generates welding quality evaluation parameters according to the dynamic feature set; and the output control device generates a welding process parameter adjusting instruction based on the welding quality evaluation parameter. The system realizes real-time detection and dynamic control of welding quality, improves welding production efficiency and quality stability, and is suitable for various industrial welding scenes.

The invention discloses a contact ablation assessment method and system in an SF6 circuit breaker breaking test, and relates to the field of contact ablation assessment, and the method comprises the steps: connecting an arc voltage divider in parallel at two ends of an SF6 circuit breaker, deploying a displacement sensor, and starting a main contact and arc contact breaking test; in the test process, arc voltage, current magnitude, contact displacement and voltage waveform data are acquired in real time through a high-frequency data acquisition system, denoising processing is performed on the voltage waveform data, and starting time, duration time and peak voltage of the arc are extracted; establishing a regression relation model between the arc duration time and the current magnitude according to the arc duration time and the current magnitude; and evaluating the ablation degree of the main contact through the regression relation model between the arc duration and the current magnitude, evaluating the ablation degree of the arc contact through the contact displacement, and generating a real-time contact health evaluation report according to the ablation evaluation result. And the evaluation efficiency is effectively improved.

The invention relates to the technical field of welding control, in particular to a welding control method and system for a tank body welding machine. The method comprises the steps that in the arc starting stage, the change rate of contact resistance is calculated in real time, when the change rate is larger than a preset change rate threshold value, main welding current is switched, a welding wire is drawn back to complete arc starting, and in the steady-state welding stage, the reference height of a welding gun is calculated based on the rotation angle of a tank body and pre-stored weld joint contour data; performing fast Fourier transform on the arc voltage, calculating an arc form factor, weighting deviation between the target arc voltage and the arc voltage by using the arc form factor to obtain a welding gun height compensation amount, generating a wire feeding speed regulation factor based on the arc form factor, and regulating a reference wire feeding speed to obtain a welding gun height compensation value; and the welding gun reference height and the welding gun height compensation amount are superposed to generate a welding gun height instruction. According to the scheme, arcing can be accurately controlled, the reliability of height tracking of the welding gun and the self-adaptive wire feeding speed are improved, and the welding seam quality is improved.

The invention belongs to the field of disconnecting switches, and particularly relates to an arc extinguish chamber and a switch body of a disconnecting switch, the arc extinguish chamber comprises a frame, a magnetic conductive member, a permanent magnet and two groups of arc extinguish grid sheet assemblies, two arc extinguish holes are arranged in the frame corresponding to two sides of the magnetic conductive member, and the two groups of arc extinguish grid sheet assemblies are respectively arranged in the two arc extinguish holes. An arc extinguishing space communicated with the two arc extinguishing holes is formed between the two arc extinguishing grid sheet assemblies, and the frame is provided with a magnetic conductive plate covering the permanent magnet and the two arc extinguishing grid sheet assemblies. The arc extinguish chamber adopts a magnetic blow-out structural design, a closed magnetic field is formed among the permanent magnet, the magnetic conductive plate and the magnetic conductive piece, the permanent magnet concentrates the magnetic field in an arc extinguish space through the magnetic conductive plate and the magnetic conductive piece, magnetic field leakage is reduced, the magnetic field utilization rate is improved, and the magnetic field intensity is enhanced, so that the arc control capability can be effectively improved, and the arc voltage is effectively improved; therefore, the rapid extinguishing of the electric arc is facilitated, and the arc extinguishing performance of the switch body of the isolation switch is improved.