63 results about "Arc stability" 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 relates to the technical field of welding parameter correction, and provides a welding parameter correction method for real-time molten pool morphology feedback, which comprises the following steps of: capturing a molten pool image, an arc spectrum and an infrared radiation signal in real time, accurately extracting geometrical characteristics and contour vibration frequency of a molten pool, and dynamically evaluating arc stability and a thermal attenuation state. And when defects are detected, welding parameter correction is generated based on a process knowledge graph and Bayesian reasoning, collaborative correction of parameters such as welding current, welding voltage and welding speed is achieved through reinforcement learning optimization weight distribution, and the change trend of morphology characteristics of a molten pool is continuously monitored after correction. According to the method, the depth belief network is judged and optimized by combining the descending rate of the morphology defect probability, and the corrected successful case is supplemented to the process knowledge graph, so that the welding quality stability is remarkably improved, the method is particularly suitable for automatic production of a high-precision welding scene, the defect rate can be effectively reduced, and the production efficiency can be effectively improved.

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 invention belongs to the technical field of welding, and particularly relates to an intelligent welding temperature control method and system.The method comprises the steps that a welding data pair sequence containing a plurality of welding data pairs is obtained; a welding power section is obtained; according to all adjacent instantaneous welding power in the welding power section, an electric arc stability index is calculated, and welding equivalent heat flux is calculated; calculating a heat conversion efficiency coefficient according to the welding temperature data and the equivalent heat flux; calculating a thermal unbalance index by using the thermal conversion efficiency coefficient and the welding equivalent heat flux at the same moment; predicting a target power index by combining the average power of the welding power section, the electric arc stability index and the thermal imbalance index; and the controller adjusts the actual output power according to the target power index. The technical problem of multi-dimensional data control defects during welding temperature control is solved.

The invention relates to the technical field of material processing, and discloses a nitrogen content dynamic regulation and control process for variable polarity argon arc welding of high-nitrogen steel, which comprises the following steps: adjusting the proportion of nitrogen in shielding gas in real time based on a detection result of a flowing state of a molten pool; dynamically regulating and controlling the variable polarity switching frequency based on the arc stability detection signal; the gas supply delay time is adjusted based on the welding heat input change condition; and current waveform modulation parameters are synchronously optimized based on the penetration change so as to realize uniform distribution of nitrogen elements. According to the nitrogen content dynamic regulation and control process for variable-polarity argon arc welding of the high-nitrogen steel, the nitrogen element requirements of different areas of a molten pool can be accurately matched, and the problem that the local nitrogen content is too high or too low due to uneven convection of the molten pool is solved; meanwhile, current waveform modulation parameters are optimized in combination with fusion depth changes, the solubility stability of nitrogen elements in key areas such as the root of the weld joint can be ensured, the problems that the nitrogen content distribution is not uniform and the solubility of the root fluctuates are solved on the whole, and the nitrogen content of each area of the weld joint is closer to a design value.

The application provides an austenitic welding wire suitable for high-strength steel structure and a welding method, and belongs to the technical field of welding.The application adopts a multi-element protective gas, wherein the multi-element protective gas comprises Ar 43-50%, He 43-50%, N2 2-7% and O2 0-2% in terms of volume content, and Ar+He is greater than or equal to 93%; wherein Ar can effectively isolate air, He can shrink the electric arc, improve the electric arc temperature, N2 can improve the electric arc stiffness, supplement the N element loss of the weld, ensure the strength and toughness of the weld, and O2 can improve the electric arc stability. The multi-element protective gas can improve the forming condition of the austenitic welding material in the gas shielded arc welding, reduce welding defects and improve the strength and toughness of the weld by mixing in different proportions. The application can improve the proportion and size of the strengthening phase by controlling the composition of the welding wire, and further improve the strength and toughness of the weld.

According to the plasma welding device for the electric pressure test pump shell, intelligent welding is achieved through cooperation of hardware and software. Hardware comprises a moving and rotating mechanism composed of a master console, a straight line and a direct current motor to control the plasma welding device, and a bearing mechanism with magnetic attraction is used for stabilizing the shell. The software comprises a welding parameter self-adaption module, and parameters are automatically adapted and optimized according to shell attributes; the welding seam path planning module generates an accurate path according to the model or manual input; the real-time monitoring and early warning module monitors the welding temperature, the arc stability, the position of a plasma welder and the like and regulates and controls the welding temperature, the arc stability and the And the equipment state management module monitors equipment in real time, diagnoses faults and pushes maintenance suggestions. The device solves the problems that a traditional device is difficult in parameter adaptation, low in path planning efficiency and poor in precision, and not intelligent in process monitoring and equipment management, parameter optimal configuration and path precise planning are achieved, the welding quality stability, the operation efficiency and the equipment reliability are improved, and the efficient production requirement of the modern industry is met.

The invention discloses a self-protection flux-cored wire and a production method thereof. The preparation method of the self-protection flux-cored wire comprises the following steps of S1, material treatment, S2, machining and treatment, S3, quality detection and S4, packaging and transportation. According to the target performance of the welding wire, a powder formula is elaborately designed, and the formula generally comprises a slag former for forming slag, protecting a molten pool, controlling metallurgical reaction of the molten pool and improving welding seam forming, a deoxidizer for removing oxygen and nitrogen in the molten pool and preventing pores and embrittlement, and a gas-making agent for generating protective gas through thermal decomposition, a gas hood is formed at the end of the flux-cored wire to isolate air, alloy elements are added into deposited metal to achieve required chemical components and performance, an arc stabilizer is used for improving arc stability, and a small amount of binder is added sometimes to improve powder fluidity or keep the shape after filling, so that the application range of the flux-cored wire is widened, and the flux-cored wire is suitable for industrial production. And the device is suitable for various working environments, and the production quality of the flux-cored wires is improved.

The invention discloses an electric arc characteristic-based alloy material electric contact performance electrical test method, which comprises the following steps of: providing basic information for a high-voltage rotating arc diffusion arc and intermediate-frequency large-current breaking simulation test by acquiring contact data of a circuit breaker, and triggering a controllable rotating arc or diffusion arc between contacts by utilizing an alternating-current high-voltage small-current system, so that the contact performance of the high-voltage rotating arc and the intermediate-frequency large-current breaking simulation test is realized. An intermediate-frequency low-voltage large-current system is used for simulating the on-off working condition of an intermediate-frequency circuit breaker, electrical performance data and ablation damage information of a contact under the action of an intermediate-frequency arc are collected, weighted calculation is carried out on the arc temperature, the electrical performance and an ablation index, and a comprehensive electrical contact performance index is generated; the performance of the alloy contact under different working conditions is comprehensively evaluated, the electric contact performance test of the alloy material is realized, and the test accuracy is improved.

The invention discloses a front-mounted regulation and control method and system for welding and a medium, and relates to the technical field of welding, and the method comprises the steps that a target electric arc is dynamically monitored to obtain real-time target electric arc characteristic information, and screening and extraction are carried out to obtain real-time target electric arc parameters; performing stability evaluation analysis on the real-time target arc parameter to obtain a real-time target arc stability index; multi-dimensional environment characteristic monitoring is conducted on the welding environment of the target arc, and target environment characteristic parameters are obtained; performing feedback adjustment on the real-time target arc stability index to obtain a real-time stability index; generating an arc stability time sequence; and predictive analysis is performed on the electric arc stability time sequence in combination with a pre-regulation mechanism, and self-adaptive pre-regulation is performed according to a predictive analysis result. The technical problem that the welding quality is unstable due to the fact that real-time monitoring and dynamic adjustment of current and voltage in the welding process are lacked in the prior art is solved, and the technical effect of improving the welding quality is achieved.

The invention discloses a welding arc detection method based on a pulse camera, which comprises the following steps of: performing dynamic scene capture by using the pulse camera in an arc welding working scene, and outputting a corresponding pulse data stream; based on the pulse data flow, density enhancement, multi-scale integration and fusion reconstruction are carried out in sequence, and a high-quality reconstructed arc image is obtained; analyzing and processing the high-quality reconstructed arc image to obtain an arc geometric parameter and a temperature field parameter; quantitative evaluation of the welding arc stability and optimization of the welding quality are achieved according to the arc parameters. According to the method, the pulse camera with the time statistical characteristic is applied, the arc parameters reflecting the dynamic characteristics of the arc are captured in the arc welding work, support is provided for welding state stability monitoring and welding quality detection, and defects and abnormities which are difficult to capture by a traditional camera are helped to be monitored.

The invention belongs to the field of power supply control, particularly relates to a variable-frequency power supply control system, method and equipment for a submerged arc furnace, and aims to solve the problems of high power frequency power supply loss, unstable arc, low efficiency and high cost caused by dependence on a high-loss phase-shifting transformer or a high-capacity reactive compensation device in the prior art. The power supply topology is composed of a multi-winding transformer and n variable-frequency power modules, n is a positive integer, and the multi-winding transformer comprises a primary winding and n secondary windings; the primary winding is provided with input ends A, B and C which are connected with a power grid; the output ends ui, vi and wi of the ith secondary winding are connected to the input end of the ith variable-frequency power module, and i is a positive integer and is greater than or equal to 1 and less than or equal to n; the output ends of all the frequency conversion power modules are connected in parallel to form output terminals a and b which are connected with a submerged arc furnace short net. Power grid harmonic waves are eliminated, a reactive power compensation device is omitted, transformer loss is reduced, arc stability is improved, and cost and reliability optimization are considered.

The invention belongs to the field of aeronautical material manufacturing, and relates to a method for eliminating arc striking of a crucible wall in the titanium alloy VAR smelting process and application. According to the method, the arc striking phenomenon of the crucible wall in the VAR smelting process of the high-Cl-content titanium sponge is completely eliminated by preventing the high-Cl-content titanium sponge, the consumable electrode and the electrode block from absorbing moisture and adopting multi-row fast extraction degassing and short-arc smelting in the VAR smelting process; specifically, through electrode block structure optimization and technological parameter cooperation, closed-loop control is formed from multiple dimensions of gas generation, gas discharge, arc stability and the like, and the limitation that a traditional method only depends on a single technology is solved; furthermore, moisture absorption prevention control reduces moisture introduction from the source, low forevacuum control strengthens gas discharge in the smelting process, and double control greatly reduces the splashing risk; furthermore, differentiated parameters are formulated for key areas such as welding seams, and the process stability is ensured through quantitative control.

The present application provides a kind of coating stainless steel welding wire and its preparation method, it is related to welding material field, including welding wire matrix and coating, the coating is coated on the outer surface of the welding wire matrix, by the total mass of the coating, the coating includes the following mass percent of raw materials: base oil 70~85%, molybdenum disulfide 2~5%, graphene 0.5~1%, monocrystalline silicon powder 1.5~3%, potassium borate 10~20%, nano titanium dioxide 0.5~1%.The present application provides a kind of coating stainless steel welding wire and its preparation method, the potassium borate in coating, nano titanium dioxide can improve the arc stability in the welding process, reduce the spatter rate;Molybdenum disulfide, graphene can increase the conductivity of welding wire while also can significantly improve the stability of welding wire feeding;Monocrystalline silicon powder can improve the forming state of weld, the final finished product coating stainless steel welding wire has good wire feeding stability, surface coating uniform and dense, arc stable, welding spatter is small, and the weld forming is good.

The invention provides a welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding and a preparation method of the welding rod, and relates to the technical field of welding materials. The welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding comprises a core wire and a coating, and the coating comprises, by mass, 22%-30% of rutile, 29%-38% of marble, 3.5%-5.0% of fluorite, 18%-24% of cryolite, 3.5%-5.0% of potassium titanate, 0.8%-1.5% of cobalt powder, 0.8%-1.5% of molybdenum powder, 1.5%-3.0% of ferroniobium, 0.8%-1.5% of manganese metal, 0.8%-1.5% of reduced iron powder, 0.4%-1.0% of sodium alginate, 0.8%-1.5% of sodium carbonate and 0.4%-1.0% of CMC. When the welding rod is used for carrying out submerged arc horizontal position welding on the nickel-chromium-cobalt-molybdenum high-temperature alloy, the electric arc stability is good, deslagging is good, forming is attractive, deslagging is easy, deposited metal components are stable, and the mechanical property is excellent.

The invention belongs to the technical field of welding equipment, and discloses a method and an experimental device capable of inhibiting solidification cracks of a high-strength aluminum alloy, the experimental device comprises molten drops, a swing light beam, a laser swing welding head, a connecting mechanism, a welding wire, an interlocking structure, a hollow tungsten electrode, a protective gas hood, an electric arc and a workpiece; the problem that the electric arc stability is poor in the conventional heterogeneous stranded welding wire electric arc welding process is solved, the hollow tungsten electrode electric arc provides a stable heat source to melt the welding wire to achieve low-splashing molten drop transition, meanwhile, the swing laser stirs a molten pool, uniform distribution of alloy elements is promoted, and the segregation problem caused by rapid solidification of high-strength aluminum alloy is solved. The aluminum wire and zirconium / titanium wire compounded stranded welding wire structure is adopted, microalloying elements are accurately transited to a molten pool on the premise of ensuring equal-strength matching of a welding seam and a base material, the grain refining effect is remarkable, the welding seam solidification crack inhibiting effect is remarkable, and meanwhile the joint strength is improved.

The invention relates to the technical field of welding, and discloses an alkaline welding material with high arc stability and high impact absorbing energy and a preparation method thereof. The alkaline welding material comprises a steel core and composite mineral powder, and the composite mineral powder is pressed on the surface of the steel core through a binder. Or the alkaline welding material comprises a low-carbon steel skin and composite mineral powder, and the composite mineral powder is wrapped by the low-carbon steel skin through mechanical rolling; the composite mineral powder comprises, by mass, 30-35 parts of marble, 1.5-10 parts of calcium aluminate, 20-28.5 parts of fluorite, 1-2 parts of synthetic mica, 15-20 parts of iron powder, 5-7 parts of atomized ferrosilicon, 3-5 parts of medium carbon ferromanganese, 4-5 parts of ferrotitanium, 1-2 parts of titanium dioxide and 1-2 parts of sodium carbonate. The obtained alkaline welding material can reduce the melting point of slag, refine grains, improve the cleanliness of molten steel, reduce the fluoride content and ionization energy in the coating, and improve the impact absorbing energy and the arc length of the welding material.

The application discloses a welding arc detection method based on a pulse camera, which comprises the following steps: using a pulse camera to capture a dynamic scene under an arc welding working scene and outputting corresponding pulse data flow; based on the pulse data flow, sequentially performing density enhancement, multi-scale integration and fusion reconstruction to obtain a high-quality reconstructed arc image; then analyzing and processing the high-quality reconstructed arc image to obtain arc geometric parameters and temperature field parameters; and finally, realizing quantitative evaluation of welding arc stability and optimization of welding quality according to the arc parameters. The method provided by the application can capture arc parameters reflecting the dynamic characteristics of the arc in the arc welding work by applying a pulse camera with time statistical characteristics, thereby providing support for welding state stability monitoring and welding quality detection and helping to monitor defects and abnormalities that are difficult to capture by a traditional camera.

The application discloses a kind of MIG welding control method and welding machine, control method includes: in every droplet transition period, add arc breaking stage, make every droplet transition period include short circuit stage, arc stage and arc breaking stage;Wherein, in every droplet transition period, add arc breaking stage includes: in response to the preset time after arc stage of arc current output, switch to PWM control, in PWM control stage, arc is extinguished, to enter to arc breaking stage;In response to the output of no-load voltage after PWM control ends, and carry out short circuit detection.The application adds arc breaking stage on the basis of short circuit stage and arc stage, and arc breaking stage is realized by PWM control, effectively avoid the occurrence of droplet repulsion transition and droplet drop difficult phenomenon, to reduce welding spatter and improve arc stability, improve welding quality.

The adjustable carbon dioxide protection welding contact tube comprises a contact tube body, a threaded column is fixedly connected to the outer portion of the contact tube body, through holes are formed in the threaded column and the contact tube body in a penetrating mode, a first penetrating opening is formed in one end of the contact tube body, and a second penetrating opening is formed in the other end of the contact tube body. One end of the contact tube body is divided into two sheet-shaped structures, in the embodiment, as long as abrasion exists, pliers are taken, the two sides of the contact tube body are clamped to be close to each other and bent oppositely, and a welding wire is clamped again, after clamping is adjusted, the contact tube can be repeatedly used, and various types of manual welding or robot welding can be achieved. The contact tube can be applied to welding wires of various types and thicknesses, the tail end is in tight contact, point arc stability can be guaranteed, contact points are not changed, the contact tube body can be continuously used, and waste of resources is avoided.

The application provides a pulse arc welding circuit and device, which comprises an arc module and a power supply module comprising a main power supply, an electronic switch and a control unit; wherein both ends of the main power supply are connected with the arc module, the control end of the electronic switch is connected with the control unit, and the input end and the output end of the electronic switch are both connected with the arc module; due to the parallel electronic switch bypass at the arc module, the control unit provides a control pulse to the electronic switch, so that the electronic switch shunts the current in the loop of the arc module, and then the electronic switch realizes the pulse modulation of the basic pulse provided by the main power supply, and obtains a high-frequency pulse; compared with the prior art, the application can output a high-frequency pulse, and improves the arc stability and the arc heat energy density.

The application belongs to the technical field of intelligent control of smelting furnaces, in particular to an intelligent smelting furnace for titanium alloy heating, comprising a data acquisition module, an arc stability determination module, a position adjustment control module and a feedback adjustment module. The arc stability determination module combines arc voltage and current double parameters, and is based on the design of dynamic adjustment of voltage and current variation coefficient weight based on electrode consumption, which is suitable for the change of current fluctuation sensitivity after the adaptation of electrode consumption, realizes real-time and accurate quantitative evaluation of arc stability, can timely and accurately identify abnormal state of consumable electrode, generates an adjustment vector containing height and transverse displacement through molten pool shape characteristics and arc deviation characteristics, avoids smelting defects such as molten pool turmoil, local overheating and composition segregation caused by insufficient adjustment pertinence, and finally dynamically optimizes weight distribution and adjustment coefficient through a feedback mechanism, which significantly improves the arc stability control and adjustment accuracy.

This invention belongs to the field of intelligent control and big data processing technology, specifically relating to a power intelligent control and management method and system based on handheld welding equipment. The method includes: real-time acquisition of arc physical state signals, welding torch operation posture signals, and material interface feature signals of the workpiece during the welding process using multimodal sensors; millisecond-level time-series modeling of the arc physical state signals to extract dynamic indicators of arc stability; spatial motion trajectory analysis of the welding torch operation posture signals to generate dynamic features of the welding torch posture; and joint frequency and spatial domain analysis of the material interface feature signals to identify the type of dissimilar metal interface region where the current welding point is located. This system, by integrating a multimodal millisecond-level sensing system of arc spectrum, welding torch posture, and material interface, achieves real-time, accurate, and comprehensive characterization of the welding conditions.

A dry cell-based arc lighter, relating to the technical field of lighters, and comprising: a power supply circuit; a boost module; a power supply management module, wherein an output end of the power supply management module is connected in parallel to an energy storage capacitor, the power supply management module charges the energy storage capacitor electrically connected to the power supply management module, and the energy storage capacitor serves as an operating voltage; a switch module, comprising sequential input of a first signal and a second signal; a main control module, configured to output a stop signal to the boost module on the basis of the first signal inputted from the switch module, and to output an ignition signal to an arc driving module on the basis of the second signal inputted from the switch module; and the arc driving module, electrically connected to a high-voltage generator, and configured to drive the high-voltage generator to generate an arc on the basis of the ignition signal outputted by the main control module. The boost module and the power management module are used to step up the output voltage of a dry cell and supply power to the energy storage capacitor, so that the energy storage capacitor serves as an operating voltage, thereby effectively ensuring arc stability and improving the performance of the dry cell-based arc lighter.

The invention discloses a welding electrode for high-current argon tungsten-arc welding and a preparation method of the welding electrode, and belongs to the technical field of welding materials. The welding electrode comprises a columnar base body and a discharging end face. The columnar base body is formed by welding a tungsten rod and a copper rod through electric arc welding; the discharge end face is located at the end of the tungsten rod, and 2-4 regularly-distributed convex points are arranged on the surface of the discharge end face and serve as arc discharge points. The preparation method comprises the steps of material pretreatment, positioning and clamping, nickel powder coating, welding parameter setting, copper-tungsten welding, welding joint cleaning, salient point structure manufacturing, copper electrode heat dissipation channel manufacturing and quality inspection. A copper-tungsten composite structure is adopted, a plurality of discharge protruding points are arranged at the end of the tungsten electrode, the single-point burn-out rate is remarkably reduced by dispersing electric arc heat loads, rapid metallurgical bonding of a copper bar and a tungsten bar is achieved through the electric arc welding technology, the burn-out resistance service life is greatly prolonged, the electric arc stability is greatly improved, and the welding rod is suitable for large-current welding, aluminum alloy beveling welding and the like.

The invention relates to the technical field of welding flux, in particular to calcium silicate type smelting welding flux and a preparation method and application thereof. The calcium silicate type smelting flux is composed of the following components in percentage by mass: 13%-25% of CaF2 and 75%-87% of CaSiO3. The calcium silicate type smelting flux is composed of CaSiO3 and CaF2 in a specific proportion, and the CaSiO3 and the CaF2 have a synergistic effect, so that on one hand, the oxygen content in a welding seam obtained after welding tends to be reasonable, the welding seam has good low-temperature toughness and deslagging performance, excellent arc stability and welding seam formability, the welding process is stable, and metal components and structures of the welding seam are uniform; the surface appearance is good, air holes, cracks and other defects are avoided, and it is guaranteed that weld joints have excellent mechanical properties; and on the other hand, the P element content in a weld joint obtained after welding can be remarkably reduced, the good mechanical performance of the weld joint is guaranteed, and particularly, the low-temperature impact toughness of a welded joint obtained after welding is good.

The present invention provides a flux-cored welding wire and a preparation method thereof, comprising: a steel strip and a flux core, wherein the flux core is filled in the steel strip; the flux core comprises the following raw materials in percentage by mass: 7-10% low-carbon ferrochrome, 3-5% high-carbon ferrochrome, 7-10% metallic manganese, 5-7% ferromolybdenum, 4-6% rutile, 40-55% fluorite, 3-5% quartz, 1-2% potassium feldspar, 1-2% potassium fluozirconate, 2-3% calcium silicate powder, 3-5% magnesium powder, 3-4% 45% ferrosilicon, and the balance is atomized iron powder. The flux-cored welding wire provided by the present invention can, during welding, improve slag fluidity, reduce slag spatter, and enhance arc stability, thereby optimizing welding process performance; and can also enhance the high-temperature oxidation resistance and corrosion resistance of the high-deposited metal, resulting in a weld with excellent thermal crack resistance and low-temperature toughness, thereby making the weld of heat-resistant steel more adaptable to harsh environments of high temperature, high pressure, and steam corrosion.

The invention discloses a rocking arc narrow-gap arc deformation groove welding method and device, and the method comprises the steps: building an intersection point time model of an arc motion track and a variable groove center line, collecting a welding image containing an arc deformation groove by a visual sensor at an interval of a sampling interval, processing the welding image by a computer image processing system, and carrying out the welding of the arc deformation groove. The variable groove gap and the diameter of the inner side wall and the diameter of the outer side wall of the variable groove are detected in real time, the real-time radius of the center line of the variable groove and the real-time arc rocking angle are calculated, and on the premise that the average welding line energy ratio lambda of the outer side wall of the variable groove and the average welding line energy ratio lambda of the inner side wall of the variable groove is equal to 1, the variable groove is obtained. The welding controller drives the electric arc to weld in the arc deformation groove according to the real-time electric arc rocking angle and the real-time residence time of the outer side wall of the variable groove, heat input balance of the inner side wall and the outer side wall of the arc deformation groove in one movement period of the electric arc is achieved, the fusion depth of the side wall of the variable groove is accurately controlled, and the welding quality of the variable groove is improved. The arc side wall climbing phenomenon is restrained, the arc stability is improved, and welding seam forming is improved.

The invention relates to the technical field of metallurgy, discloses a direct-current power supply arc stability control method based on a submerged arc furnace, and solves the problems of logic limitation and insufficient matching in the prior art. The instantaneous value and the change rate of the arc resistance are calculated by collecting arc voltage, arc current and electrode position signals in real time; constructing a cathode spot drift feature recognition model, and extracting a high-frequency fluctuation component of 10kHz-100kHz in the instantaneous value of the resistance to be matched with a preset feature spectrum so as to recognize a drift state; voltage and current compensation values are generated by adopting a model prediction control algorithm introducing a drift coefficient, and output parameters of the direct-current power supply are cooperatively adjusted and controlled in combination with multiple dimensions. The control method provided by the invention can accurately capture and inhibit the specific cathode spot drift of the direct current arc, reduce the arc fluctuation and arc breaking phenomena, improve the smelting stability, and reduce the invalid energy consumption and electrode loss, and is suitable for the arc stability control of the direct current power supply of the submerged arc furnace.

The invention discloses a duplex stainless steel electric arc additive manufacturing method, and relates to the technical field of metal material additive manufacturing, and the duplex stainless steel electric arc additive manufacturing method comprises the following steps that an immersion type water tank is provided, and the water tank is filled with a cooling medium; an additive manufacturing substrate is fixed to a lifting platform in the water tank, and the substrate is immersed below the liquid level; carrying out cladding deposition on the substrate immersed in the cooling medium by adopting an electric arc heat source in a protective atmosphere, and stacking layer by layer to form a component; wherein in the cladding deposition process, an external magnetic field is applied to a molten pool area, and the magnetic line direction of the external magnetic field is basically perpendicular to the welding advancing direction. According to the method, magnetic field control and a water cooling system are deeply fused, on the premise that the electric arc stability is guaranteed, the structure controllability, the structure compactness and the service reliability of the duplex stainless steel WAAM technology are systematically improved, and the method has obvious academic innovation and also has good engineering practical value and popularization prospects.