268 results about "Tungsten electrode" patented technology

This application relates to a laser-plasma composite cladding head and a composite cladding method, and belongs to the field of surface processing of metallic materials. In the laser-plasma composite cladding head of this application, a ring laser beam is split into two half-ring laser beams through an upper roof lens to avoid a tungsten electrode. The two half-ring laser beams pass through a left 45° reflective lens to be coaxial with the tungsten electrode and then are integrated into a complete ring laser beam through a lower roof lens, thereby allowing a coaxial output of the ring laser beam and a plasma beam. This application integrates the advantages of laser cladding and plasma cladding and adopts coaxial compounding and synchronous powder-feeding.

The invention relates to a low-power pulse laser-induced enhanced double-TIG (Tungsten Inert Gas) composite heat source medium-thickness plate narrow-gap efficient welding method, which adopts two independent TIG welding machines, a pulse laser and a wire feeder, and two TIG welding guns are positioned in a narrow-gap groove on the same side of a plane on which a laser beam perpendicular to the plate welding direction is positioned, the angle and distance of each heat source can be independently adjusted, before welding, the space angle and distance among the two TIG welding guns, laser beams and welding wires are adjusted, tungsten electrodes at the front ends of the two TIG welding guns and the laser beams emitted by a laser device are arranged in the corresponding space range, and a plate to be welded and the welding wires can obtain sufficient heat for melting, wetting and spreading; during welding, welding parameters are adjusted, the coupling plasma energy density in the narrow gap space range is controlled, and the droplet transition behavior of a welding wire and the flow characteristic of a molten pool are adjusted and controlled in real time. Compared with traditional arc welding, the welding process window can be improved, and the welding deposition efficiency is improved by more than 10 times.

The utility model discloses an automatic tungsten electrode replacing device which comprises a device base, a first electrode, a second electrode, a third electrode and a fourth electrode. At least part of the tungsten electrode storage warehouse is arranged in the containing space, the tungsten electrode storage warehouse comprises a rotating assembly and a plurality of tungsten electrode storage pieces, each tungsten electrode storage piece is configured to store a tungsten electrode, and each tungsten electrode storage piece is arranged on the rotating assembly so as to rotate along with the rotating assembly; the rotating driving mechanism is arranged in the accommodating space and is configured to be in driving connection with the rotating assembly; the tungsten electrode moving mechanism is arranged in the containing space, and the tungsten electrode moving mechanism is configured to enable the tungsten electrode in the at least one tungsten electrode storage part to move to a first position in the first direction; wherein the tungsten electrode located at the first position is configured to be replaced by a tungsten electrode replacement robot. According to the automatic tungsten electrode replacing device, the requirement for automatically replacing the tungsten electrode in the market is met through the simple structure and the low equipment cost.

The invention relates to the technical field of electric arc welding equipment, and provides electric arc welding equipment for automobile part machining, which comprises a welding head seat, a tungsten electrode welding needle is detachably fixed at the bottom end of the welding head seat, and a gas spraying assembly for spraying protective gas is fixed at the top of the outer side of the welding head seat. The outer side of the welding head base is sleeved with a protection assembly for protecting the tungsten electrode welding needle. The mounting column is fixed at the top end of the welding head seat; by means of the technical scheme, the problems that in the prior art, electric arc welding equipment is not provided with an effective protection mechanism, a tungsten electrode welding needle is exposed outside for a long time and is prone to being impacted to be damaged in the idle or non-working state, an air injection pipeline is usually of a fixed structure, an air cut-off plugging mechanism is lacked, and the equipment is damaged are solved. The diameter of a welding wire guide pipe of an existing electric arc welding device is fixed, the welding wire guide pipe can only adapt to welding wires with one diameter, effective adjustment cannot be conducted according to different welding wire diameters, and the capacity of the welding wire guide pipe for adapting to complex workpieces or various types of welding wires is limited.

The invention provides a positive and negative pressure pulse electric arc welding and additive manufacturing method which comprises the following steps: inducing electric arc plasma to generate a negative pressure electric arc with an anti-gravity adsorption effect through a current-magnetic field-hollow tungsten electrode-gas collaborative design, and forming a time sequence coupling process with a positive pressure electric arc. The core of the method is that a magnetic control positive pressure and negative pressure electric arc welding external field is cooperated with a molten pool reconstruction forming mechanism, that is, the dynamic and thermodynamic states of a molten pool are accurately balanced by dynamically switching the electric arc pressure direction and regulating and controlling the action proportion and alternating frequency of negative pressure and positive pressure electric arcs. A self-adaptive magnetic field threshold model based on current intensity and a gas mode is combined with variable polarity power supply parameters and gas flow rate cooperative control, and the problems of thin plate welding fusion penetration and thin-wall additive molten pool instability are effectively solved. According to the method, a welding wire, powder or laser composite manufacturing mode can be integrated, the forming precision and performance of a complex structure are remarkably improved, and an innovative technical support is provided for high-quality and high-efficiency welding and additive manufacturing.

The invention provides an argon arc welding tungsten electrode appearance defect detection method and system and a storage medium, and relates to the technical field of tungsten electrode appearance detection.The method comprises the steps that firstly, a sample electrode with known defects is subjected to three-dimensional scanning and discretization into a plurality of space points, and each point is endowed with a defect existence mark; by applying a composite sine wave excitation current, an eddy current signal generated when a collector spirally passes through a detection coil at a constant speed is acquired, and laser ultrasonic scanning is synchronously utilized to acquire full-matrix data and reconstruct a three-dimensional gray model. And constructing a double-branch deep learning model, fusing the eddy current feature vector and the ultrasonic image block feature, and learning a mapping relationship between the eddy current feature vector and the defect mark. And performing the same detection on a to-be-detected electrode, outputting the defect confidence of each position by using the trained model, calculating a comprehensive quality index in combination with a preset defect severity weight and a spatial key region weight, and judging whether the electrode is qualified or not according to a qualified threshold value. According to the invention, high-precision, automatic and comprehensive detection of surface and internal defects is realized.

The invention discloses a method for determining the offset distance of a welding gun of a metal plate welding case lock bottom welding seam and a welding method, and belongs to the technical field of fusion welding technologies. The method for determining the offset distance of the welding gun comprises the steps that the machining side welding thickness L1, the metal plate side welding thickness L2 and the bottom locking thickness L3 of the metal plate welding case are obtained, and the axis offset P of a welding gun tungsten electrode and the center of a welding connector is calculated; based on the axis offset P, the opposite position of a welding gun tungsten electrode is determined, the offset angle theta over a welding bead and the diameter phi A of the welding bead are obtained, and the offset distance L between the opposite position of the welding gun tungsten electrode and the position over the welding bead is calculated; and based on the axis offset P of the welding gun tungsten electrode and the center of the welding joint and the offset distance L between the position right opposite to the welding gun tungsten electrode and the position right above the welding bead, the alignment position line of the tip end of the welding gun tungsten electrode is determined at the workpiece welding joint. The welding method comprises the steps that the position of the circumferential automatic welding gun mechanism is adjusted based on the alignment position line, and a welding gun is located in the welding bead upslope direction in the circumferential direction.

The utility model discloses an ultrasonic wire feeding additive manufacturing device which comprises a base plate, a tungsten electrode welding gun, a wire feeder and an ultrasonic vibration system. The tungsten electrode welding gun, the wire feeder and the ultrasonic vibration system are jointly connected with a positioning rod, and the positioning rod is movably arranged above the base plate. The ultrasonic vibration system is located on one side of the wire feeder and used for generating high-frequency vibration signals and transferring the generated high-frequency signals to a welding metal wire. According to the ultrasonic wire feeding additive manufacturing device, ultrasonic vibration is applied to the welding metal wire, so that a high-frequency vibration signal is transmitted into the molten pool through the welding metal wire, cavitation is generated in the molten pool, beta columnar crystals generated in the solidification process can be effectively broken, and the production efficiency is improved. And the anisotropy problem of the internal structure and the mechanical property in the wire feeding direction and the stacking direction is solved, that is, the performance of an additive manufacturing part is improved.

The invention discloses a tungsten-based heavy alloy surface-coated stainless steel component and a preparation method and application thereof, and belongs to the technical field of metal connection. The preparation method of the component with the tungsten-based heavy alloy surface coated with the stainless steel comprises the following steps that a transition layer is additionally attached to the surface of tungsten-nickel-iron alloy; the tungsten-nickel-iron alloy with the transition layer and austenitic stainless steel are assembled, and a sheath assembly is obtained; carrying out degassing and hot isostatic pressing treatment on the sheath assembly; according to the preparation method of the component coated with the stainless steel on the surface of the tungsten-based heavy alloy, the tungsten-based heavy alloy and the austenitic stainless steel are used as matrixes, and preparation of the component coated with the tungsten-based heavy alloy through the austenitic stainless steel is achieved through the method of combining hot isostatic pressure diffusion bonding and powder metallurgy. An existing technology that a stainless steel shell is used for protecting tungsten-based heavy alloy and an end socket is closed in an argon tungsten-arc welding mode is replaced, an original assembly gap is removed through metallurgical bonding, and the whole running-down system is more stable in operation and better in corrosion resistance.

The invention relates to the technical field of dissimilar material welding, and provides a red copper and stainless steel weldment and argon tungsten-arc welding process, which comprises the following steps of: selecting stainless steel and red copper with the thickness of more than or equal to 1mm and less than or equal to 3mm as a to-be-welded workpiece, oppositely butting the stainless steel and the red copper, controlling the width of a gap at the butting part of the stainless steel and the red copper, and forming a V-shaped groove at the butting part of the stainless steel and the red copper; the butt joint of the back faces of the red copper workpiece to be welded and the stainless steel workpiece to be welded is subjected to positioning spot welding; after tack welding, in an argon shielding gas atmosphere, a tungsten electrode is used as a welding heat source, a direct current positive connection mode is adopted for conducting backing welding on the butt joint position, only the tungsten electrode is used for heating in the welding process, the tungsten electrode is close to the side of the stainless steel workpiece to be welded, and welding wire filling is avoided; and after backing welding, the V-shaped groove is filled with a welding wire in the argon shielding gas atmosphere, and then a tungsten electrode is adopted as a welding heat source to conduct cosmetic welding on a backing welding seam. The method has the characteristics of high welding quality, simple and convenient welding process and relatively low cost.

The invention relates to the technical field of air cooler welding, in particular to an automatic welding device and process for an air cooler tube plate and a tube. The tube plate robot is movably arranged on the base, a welding machine head is arranged on the tube plate robot, and the welding machine head is used for welding a tube plate and a tube; the visual positioning camera is fixed on the tube plate robot and is positioned beside the welding machine head; the pipe plate robot welding work depends on the cooperation of the robot and the visual positioning camera, the efficiency is greatly improved, the touch locating function is achieved, the arc height and the arc starting radius can be automatically adjusted according to the actual condition of each pipe, and therefore the welding seam consistency is good; meanwhile, moving, starting and stopping of a welding head of the tube plate robot welding workstation are controlled by equipment, manual intervention is almost not needed, and the technical problems that in the prior art, shielded metal arc welding is greatly influenced by human factors, and the manual participation degree of semi-automatic tube plate tungsten electrode argon arc welding is high are solved.

The invention discloses a manual tungsten electrode welding method for a zirconium pipe, relates to the field of zirconium pipe welding, and provides the following scheme for solving the problems that the zirconium pipe is a new material, few cases are referenced in the welding method, and no matched tool is used for matching so as to improve the welding efficiency. The method comprises the steps that firstly, two sections of zirconium pipes to be welded are clamped on a clamping and polishing tool, and groove machining treatment is conducted on the zirconium pipes to be welded till silver white is exposed on the surfaces; and 2, the two sections of zirconium pipes are assembled, then the assembled zirconium pipes are welded through a tungsten electrode welding gun, and the front face and the back face of a welding seam are protected through welding gun protection gas, zirconium pipe external protection gas and zirconium pipe internal protection gas in the welding process. According to the method, the measures of welding seam front face large nozzle protection and in-pipe argon filling welding seam back face protection are adopted, the protection effect on a high-temperature area welding seam and a heat affected area is ensured, the welding quality is ensured, the clamping and grinding tool is arranged, and the universality during zirconium pipe welding is remarkably improved.

The invention discloses a welding method for optimizing a welding seam structure of a nickel-based alloy composite board. The nickel-based alloy composite board comprises a base material layer and a nickel-based alloy composite material layer, and a transition layer is arranged at the bonding interface of the base material layer and the nickel-based alloy composite material layer; the welding method comprises the steps that a trapezoidal groove is machined in the position, corresponding to the base material layer, of the welding section of the nickel-based alloy composite board; a U-shaped groove is machined in the position, corresponding to the transition layer, of the welding section of the nickel base alloy; a groove is not machined in the position, corresponding to the nickel-based alloy composite material layer, of the welding section of the nickel-based alloy composite plate, and a truncated edge is reserved; welding the nickel-based alloy composite material layer by adopting single tungsten electrode argon arc welding; welding the transition layer by adopting single tungsten electrode argon arc welding; and welding the base material layer by adopting single tungsten electrode argon arc welding.

The invention discloses a gradient preparation method of a compact barrier type rare earth ceramic coating, and belongs to the technical field of high-temperature protective coatings. The preparation method comprises the following steps: pretreating a tungsten electrode substrate; sequentially preparing a sensor layer integrated with a distributed optical fiber sensor, a gradient transition layer which is realized by adopting a four-channel synchronous powder feeding technology and has continuous and gradual components, and a self-adaptive layer which is prepared by adopting a laser-induced in-situ synthesis technology and contains high-entropy rare earth zirconate and an intelligent additive; the self-healing layer contains a triple temperature triggering microcapsule system; and finally, post-processing and function activation are carried out. The prepared coating forms an intelligent response type gradient composite structure from inside to outside, has excellent interface bonding strength, thermal shock resistance and high-temperature chemical stability and has damage self-healing and service state real-time monitoring functions, and the service life of the tungsten cathode under the severe working condition is remarkably prolonged.

The invention relates to the field of GTAW filling wire control, in particular to a GTAW liquid bridge transition closed-loop control system based on vision and electric arc cooperative sensing. The GTAW liquid bridge transition closed-loop control system based on vision and electric arc cooperative sensing is a GTAW liquid bridge transition closed-loop control system based on vision and electric arc cooperative sensing. Aiming at keeping a continuous liquid bridge transition mode for welding in a GTAW process, the invention provides a GTAW liquid bridge transition closed-loop control system based on visual sense and electric arc cooperative sensing. A GTAW robot is used for controlling the welding action; shooting a GTAW droplet transition process by using a droplet transition image acquisition system; an arc voltage signal between the welding wire end and the workpiece and an arc voltage signal between the tungsten electrode tip and the workpiece are collected through an arc signal collecting system; identifying a liquid bridge transition mode by using a GTAW liquid bridge transition mode identification system; a filling wire height control system is utilized to enable a liquid bridge transition mode to be a continuous liquid bridge transition mode.

The invention discloses an infrared induction feedback type permanent magnet magnetic field auxiliary TIG (Tungsten Inert Gas) welding device and a working method thereof, and the device comprises a TIG welding gun arranged above a workpiece, a welding power supply connected with a tungsten electrode in the TIG welding gun, a permanent magnet group arranged above the workpiece, and a magnet driving mechanism for driving the permanent magnet group, the infrared temperature detector is arranged on the side surface of the workpiece; the driving permanent magnet set and the infrared temperature detector are both connected with the control system, the infrared temperature detector detects the arc temperature distribution condition in real time and feeds back the detected arc temperature to the control system, and the control system compares the arc temperature with a preset threshold value and sends a control signal to the magnet driving mechanism according to the comparison result. The magnet driving mechanism adjusts the distance between the two permanent magnets in the permanent magnet group and the electric arc based on the control signal, and dynamic adjustment of the magnetic field intensity is achieved. According to the invention, the size of the magnetic field can be flexibly changed, and high energy consumption and electromagnetic interference of the electromagnetic coil can be avoided.

The invention belongs to the technical field of underwater welding, and discloses an underwater double-path ultrasonic synergistic laser-electric arc hybrid welding repair device and method. The device comprises a two-way ultrasonic synergistic TIG welding gun and a laser head which are both fixed on an external drainage cover, and sealing penetration pieces are arranged on the external drainage cover for the two-way ultrasonic synergistic TIG welding gun and the laser head; the double-path ultrasonic synergistic TIG welding gun comprises a tungsten electrode sound path and an end part sound path; the tungsten electrode sound path transmits ultrasonic energy to a welding gun tungsten electrode through a tungsten electrode ultrasonic transducer, the electric field at the root of the welding gun tungsten electrode and the micro-motion behavior of the welding gun tungsten electrode are affected, and therefore the electric arc is compressed, and the position of the root of the electric arc is finely adjusted. The end sound path acts on the end of the welding gun through the end ultrasonic transducers in an annular array, directional sound radiation pressure is applied, an electric arc column and the surface of a molten pool are adjusted, heat input is promoted to be evenly distributed, and the symmetry of the molten pool is improved. The welding quality and the process stability are remarkably improved.

The invention belongs to the technical field of welding, and particularly discloses a solid welding wire fusion repair welding method which comprises the steps that a to-be-fusion repair area is cleaned; the extending length of a tungsten needle on the argon tungsten-arc welding gun is adjusted not to exceed the inner diameter of a nozzle of the argon tungsten-arc welding gun; the height from the tungsten needle to the to-be-repaired area is adjusted to be a preset height, so that the electric arc does not deviate; the fusion repair included angle is adjusted to be within a first preset angle on the two sides of the weld toe included angle bisector; welding toes and plates around the welding toes are molten again through an electric arc, molten metal on the two sides of the welding toes is drained to the middle area through the surface tension of a molten pool after melting, and the surface of the solid welding wire welding seam is made to be smooth. By means of the method, a smooth transition area can be formed on the surface of the weld toe, the effect of stress concentration of the weld toe can be remarkably reduced, the weld bead shape can be finished by replacing a grinding machine with the method of weld toe fusion repair between layers, the incomplete fusion condition is reduced, and therefore the internal quality of the weld is improved.

According to the welding process for the 316LN austenitic stainless steel, the welding process is suitable for the ultralow temperature (-269 DEG C) environment, the multi-layer manual argon tungsten-arc welding (GTAW) technology is adopted, postweld heat treatment is not needed, the production process is simplified, and the cost is reduced. And by accurately controlling welding heat input, it is ensured that a welding joint has excellent toughness at the low temperature, and grain coarsening and harmful intermetallic phase precipitation are avoided. Nitrogen-strengthened 316LN base metal and a low-carbon and high-molybdenum GTS-316LM welding wire are selected, and the low-temperature strength and corrosion resistance of a welded joint are improved. Oxides and slag inclusion in the welding seam are reduced through high-purity argon protection, and the quality of the welding seam is optimized. Metallurgical bonding of welding seams is ensured through the interlayer cleaning process. Tests show that a welded joint shows excellent impact toughness and room-temperature mechanical properties at the temperature of-269 DEG C, and the ultralow-temperature application requirement is met. The process does not need postweld heat treatment, has the advantages of simplifying production, reducing cost and improving performance, and is suitable for equipment manufacturing and pipeline installation at the liquid helium temperature.

The application discloses a kind of superhigh power laser and hollow tungsten electrode composite welding methods based on magnetic rotation control technology.At present, in superhigh power laser medium plate welding, too intense heat energy conversion effect makes welding process extremely unstable, and welding problems such as porosity, spatter, forming difficult to control are prone to occur.The composition of the application includes: hollow tungsten electrode (1), superhigh power laser passes through the center hole of the hollow tungsten electrode to form coaxial composite laser beam (3), annular inductive coil or permanent magnet (2) is arranged above the welding test plate (6), the inductive coil or permanent magnet and the arc (4) at the bottom of the hollow tungsten electrode form a longitudinal magnetic field, the laser beam passes through the arc and the molten pool (5), and the longitudinal magnetic field can rotate the arc, forming a rotating arc and laser beam composite to act on the welding point area.The application is used for superhigh power laser and hollow tungsten electrode composite welding method based on magnetic rotation control technology.

The present application relates to the field of GTAW welding, and is a GTAW longitudinal swing wire feeding intelligent control system and method based on magnetic control. In view of the problems of the wire end deviating from the tungsten electrode and the unstable droplet transfer in the GTAW longitudinal swing wire feeding welding, a GTAW longitudinal swing wire feeding intelligent control system and method based on magnetic control is proposed. The relative position of the wire end and the tungsten electrode is controlled by using a visual sensing-based wire end and tungsten electrode relative position adaptive calibration method; the longitudinal swing amplitude of the GTAW wire is controlled by using a magnetic field-based GTAW wire longitudinal swing amplitude control method; the longitudinal swing frequency of the GTAW wire is controlled by using a magnetic field-based GTAW wire longitudinal swing frequency control method; and the wire feeding speed is controlled by using a wire sensing-based wire feeding speed control method.

The application discloses a tungsten electrode rotary welding gun for electric arc additive manufacturing and belongs to the technical field of additive manufacturing. The tungsten electrode rotary welding gun comprises a base for connecting an additive manufacturing device, a DD motor fixed at the lower end of the base, a sliding sleeve assembly connected at the lower end of the DD motor, the sliding sleeve assembly comprising a rotating sleeve driven by the DD motor, a wire guide tube with the upper end fixed to the base and the lower end penetrating the shaft center of the DD motor and the sliding sleeve, a wire guide nozzle fixed at the lower end of the wire guide tube, a tungsten electrode module fixed at the lower end of the rotating sleeve, the tungsten electrode module comprising a tungsten needle matched with the wire guide nozzle, and when the DD motor rotates, the tungsten needle rotates around the wire guide nozzle to form a ring-shaped heat source. The tungsten needle rotating around the wire guide nozzle provides a near-ring heat source for the welding wire, and the coaxial feeding of the welding wire and the central axis of the welding gun avoids the problem of the dependence of the non-melting electrode side-axis wire feeding electric arc additive manufacturing on the wire feeding direction, and the tungsten electrode rotary welding gun is suitable for manufacturing large components with multiple layers and complex shapes and has the characteristics of flexibility, high efficiency and high precision.

The invention belongs to the technical field of pipeline installation and construction, particularly relates to a welding unit of a non-consumable electrode gas shielded welding type internal welding machine, and aims to solve the problem of welding spatter during welding. The non-consumable electrode gun head comprises a frame and a non-consumable electrode gun head assembly installed on the frame. The non-consumable electrode gun head assembly comprises a gun seat body mounted on the frame, a tungsten electrode mounted on the gun seat body, a ceramic gas guide cover mounted on the gun seat body and used for covering the tungsten electrode, and a welding wire mounted on the gun seat body and spaced from the tungsten electrode; the tip of the tungsten electrode penetrates out of the ceramic gas guide cover, and the end of the welding wire is inserted into a molten pool in a welding seam. According to the invention, the non-gas metal arc welding unit is adopted to replace the existing gas metal arc welding unit, so that the welding of the inner circumferential weld of the pipeline without splashing is realized.

The utility model discloses a kind of welding machine tungsten electrode welding head grinding machine, including equipment box base, grinding mechanism and grinding tip mechanism. Grinding mechanism carries out preliminary leveling treatment to tungsten electrode welding head end by grinding drive motor driven grinding disc of grinding wheel;Grinding tip mechanism integrates polishing mechanism, angle adjusting mechanism and rotating mechanism, grinding tip drive motor is driven grinding disc of grinding wheel rotation, and grinding tip angle is adjusted through angle adjusting mechanism, in combination with rotating mechanism to realize annular uniform grinding. The utility model can efficiently complete the grinding of tungsten electrode welding head and accurate grinding tip, satisfy various sharpness demand, significantly improve processing efficiency and precision, suitable for various specifications of tungsten electrode welding head, provide reliable solution for welding preparation work.

A soil sampling drill machining device comprises a main protection gas nozzle and a lower protection gas nozzle, the bottom of the main protection gas nozzle is connected with the lower protection gas nozzle, a plasma beam generation mechanism is arranged in the main protection gas nozzle and comprises a main plasma beam generation device and an auxiliary cooling device, the main plasma beam generation device is located in the main protection gas nozzle, and the auxiliary cooling device is located in the main protection gas nozzle. The main plasma beam generating device sprays high-speed ion beams to the welding connector to complete welding operation, an auxiliary cooling device is arranged on the side face of the main plasma beam generating device and cools the main plasma beam generating device, and an auxiliary air spraying mechanism is arranged on the side face of the main protection air nozzle and cools the main plasma beam generating device. And the auxiliary air injection mechanism conducts auxiliary cleaning and cooling operation on the welding seam, and a tungsten electrode adjusting mechanism is arranged at the top of the main protection air nozzle and adjusts the plasma arc generation position.

The present invention relates to the technical field of arc welding equipment, and proposes an arc welding equipment for processing automobile parts, comprising a welding head seat, a tungsten electrode welding needle being detachably fixed at the bottom end of the welding head seat, a jet assembly for ejecting shielding gas being fixed at the top outer side of the welding head seat, a protective assembly for protecting the tungsten electrode welding needle being sleeved on the outer side of the welding head seat; a mounting column, and the mounting column being fixed to the top end of the welding head seat; through the above technical scheme, the problems that the arc welding equipment in the prior art is not equipped with an effective protection mechanism, the tungsten electrode welding needle is exposed to the outside for a long time, and is easily damaged by impact when the equipment is idle or not working, the jet duct is often a fixed structure, lacks a gas shut-off and sealing mechanism, and there are also safety hazards; and the diameter of the welding wire conduit of the existing arc welding equipment is fixed, and it can only adapt to welding wire of one diameter, and cannot be effectively adjusted according to different welding wire diameters, which limits its ability to adapt to complex workpieces or multiple types of welding wires.

The invention provides a solid tungsten electrode negative pressure arc plasma beam cleaning machining method. The method comprises the steps of adjusting technological parameters, forming negative pressure arc plasma beam rotary adsorption cleaning, negative pressure arc fixed-point cleaning and online monitoring and adjusting. Through the steps, different cleaning parameters are selected according to different cleaning materials, and dynamic anti-gravity, upward negative pressure and an influence area thereof are formed in an electric arc action area by utilizing a magnetic field through the synergistic effect of negative pressure electric arc plasma beam rotary adsorption cleaning and electric arc cleaning technology for regulating and controlling magnetic field threshold constraint; and the oxidation film or pollutants are directionally stripped and upwards migrated to a collecting device, so that the removal is achieved, and meanwhile, high-energy fixed-point cleaning of arc cathode spots is combined, so that high-efficiency, high-precision and wider-cleaning-range surface cleaning treatment is realized.

The invention discloses a control method and device of a welding machine and the welding machine. The welding machine comprises an inversion manual arc welding power source and a tungsten electrode, the inversion manual arc welding power source comprises an arc striking circuit, and the arc striking circuit outputs arc striking current; the control method comprises a lifting arc striking stage and a welding stage. The lifting arc striking stage comprises the steps that the thickness of a welding base material is obtained; and the arc striking current output by the arc striking circuit is controlled to be divided into at least two control intervals according to the thickness of the welding base metal, and in each control interval, the size of the arc striking current is matched with the thickness of the welding base metal. The phenomena that the electric arc is not easy to ignite and the tungsten electrode is adhered to the welding workpiece are improved, so that the problem of poor arc ignition is improved.

The invention discloses a consumable electrode plasma multifunctional welding gun, a welding system and a welding method, and belongs to the technical field of advanced welding and additive manufacturing. The welding gun is of a coaxial multi-layer integrated structure and is sequentially provided with a welding wire channel, a shielding gas channel, a water-cooling inner plasma contact tube, a hollow tungsten electrode, a plasma gas channel, a water-cooling outer plasma contact tube of an integrated powder feeding channel and an outer shielding gas channel from inside to outside. Coaxial conveying of shielding gas, plasma gas, metal wires and metal powder is achieved, and highly-compressed composite electric arcs can be generated. By adjusting the polarity of the power source, the material conveying mode and the technological parameters, the multiple functions of large-fusion-depth welding, efficient cladding, wire or wire powder collaborative additive manufacturing and high-precision repairing can be achieved through one gun, the problems that in the prior art, the function is single, efficiency is insufficient or cost is high are solved, and the advantages of being high in integration degree, powerful in function and flexible in application are achieved.

The utility model discloses a tungsten electrode replacing device, a welding robot and an automatic robot welding system. The device comprises a driving assembly arranged on a welding gun, a tungsten electrode placing device and a first tungsten electrode clamping device, wherein the tungsten electrode placing device and the first tungsten electrode clamping device are arranged within the moving range of the welding gun. The tungsten electrode placing device is used for placing a new tungsten electrode and elastically abutting against the placed new tungsten electrode; the first tungsten electrode clamping device is used for clamping a tungsten electrode to be replaced on a welding gun during replacement; the driving assembly is used for driving a second tungsten electrode clamping device in the welding gun to clamp or loosen the tungsten electrode. The driving assembly is arranged on the welding gun, the tungsten electrode placing device and the first tungsten electrode clamping device are arranged in the moving range of the welding gun, a tungsten electrode to be replaced on the welding gun can be pulled out through cooperation of the driving assembly and the first tungsten electrode clamping device, and a new tungsten electrode placed in the tungsten electrode placing device can be further embedded into the welding gun through the driving assembly. The automatic replacement of the tungsten electrode is realized, and the replacement efficiency is greatly improved, so that the welding efficiency is improved.