136 results about "Tungsten electrode" patented technology

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 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 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.

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 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.

The utility model relates to an automatic argon arc welding torch of small drift inner wall surfacing cooling circulation system, including welding torch body, ceramic mouth, tungsten electrode and cooling circulation mechanism, the bottom of welding torch body is equipped with ceramic mouth, the bottom of ceramic mouth is equipped with tungsten electrode, and is equipped with the cooling circulation mechanism for welding torch cooling in welding body, sends the cooling liquid into the liquid inlet pipe through the external drive pump, the cooling liquid flows into the spiral liquid pipe through the liquid inlet pipe, the heat of welding torch is passed through red copper heat transfer cylinder, and the heat is quickly conducted to the spiral liquid pipe, and the low temperature cooling liquid is pumped into the spiral liquid pipe from the liquid inlet pipe, absorbs the heat when the cooling liquid flows through the surface of the welding torch part, the high temperature cooling liquid flows out from the liquid outlet pipe, and the recycling use after the cooling through the external radiator, thereby taking away the heat of welding torch body, can long -time welding work, the cooling circulation mechanism is located in the welding torch body, and the unique gun body structure design can be flexible and deep into the narrow space.

1. Name of the designed product: desk type tungsten electrode point grinder (precision). 2. Use of the designed product: for grinding tungsten needle or electrode for argon arc welding. 3. Design points of the designed product: in the combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view 1.

The invention relates to the technical field of electromachining, in particular to a method and device for flexibly cutting a GH4169 alloy in a nano mixed powder discharge-electrolysis composite mode. A nano SiC particle suspension is used as electrolyte, a spiral tungsten electrode is used as a negative electrode, alloy is used as a positive electrode, an intermittent pulsed electric field is applied to initiate a composite reaction, and the electrodes are controlled to conduct flexible cutting in the advancing direction of a preset contour. The nano SiC particle suspension liquid enables a discharge point to be converted from strong discharge with sparse and concentrated energy to diffuse discharge with dense and weak energy; the spiral tungsten electrode forms an axial and radial composite flow field through mechanical rotation, so that the mass transfer and chip removal efficiency is improved, and the accumulation of blunt products is reduced; and the intermittent electric field is periodically powered on and powered off, so that discharge and electrolysis are alternately performed, and overheating and ablation are inhibited. According to the method, mass transfer and chip removal are optimized, corrosion removal product retention is inhibited, machining efficiency and quality are improved, a recast layer and cracks are inhibited, and a new thought is provided for high-quality cutting of large-thickness difficult-to-machine materials.

1. Name of the product in this design: Label (Tungsten Electrode Boxed Product). 2. Purpose of this design: for product packaging. 3. The key design features of this product are the combination of shape and pattern. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The left and right views of this product are symmetrical, so the left view is omitted.

The present application relates to aluminum sheet metal hot welding technical field, specifically disclose a kind of aluminum sheet metal hot welding system and welding method, comprising: welding rod, one end fixedly installed with the welding torch outside gap, the other end fixedly installed with arc-shaped piece, and arc-shaped piece is coupled with transmission shaft, limiting column, equidistantly arranged in weld two sides, and one-side limiting column end and aluminum plate side wall keep adhering.This application can be self-adapted by equidistant distribution limiting column the arc shape of aluminum plate outer wall, and utilize guide rod to provide circumferential driving power to arc-shaped piece, make welding rod with molten pool as center and carry out sector movement, make welding torch self-adjustment and the included angle of weld, realize using physical components directly transfer curved surface information, meet tungsten electrode and the weld after the change of curved surface keeps angle constant, greatly weaken arc blow, argon covering abnormality and other problems, guarantee weld quality.

The utility model discloses a tungsten electrode tube manual wire feeding trolley for argon arc welding relates to tungsten electrode tube welding technical field, including the car body board, the top of car body board is provided with the L type steering column, the one end of L type steering column is provided with the connecting block away from the car body board, the one end fixed connection of connecting block is away from L type steering column and is provided with the affixing ring, the inside of affixing ring is provided with the through control pipe, the through control pipe is used for the direction control to tungsten electrode tube. The utility model discloses through the through control pipe and the steering column, and the through control pipe realizes tungsten electrode tube 360 degrees adhesion weld through rotation, especially suitable for curved surface or complex structure. The steering column is combined with the through control pipe, can adapt three -dimensional space weld, replaces the high -difficulty operation in traditional manual welding.

The utility model discloses an automatic tungsten electrode cutting machine which comprises a base and an auxiliary feeding frame arranged on one side of the base, a clamping assembly is arranged on the base, a cutting machine body and a discharging assembly are fixed on the other side of the base, and the clamping assembly clamps a tungsten electrode bar and transfers the tungsten electrode bar to the cutting machine body for cutting. The clamping assembly comprises a first clamping set, a second clamping set and a third clamping set which are arranged in parallel, a sliding mechanism is arranged on the portion, between the first clamping set and the third clamping set, of the base, and the second clamping set is fixed to the sliding mechanism. And materials are automatically and movably fed to the cutting machine body, cutting is automatically completed, manpower is not needed, and the cutting efficiency is high.

The invention discloses a multi-stage plasma treatment device and method for enhancing removal of chlorinated organic compounds in factory water of a waterworks. The multi-stage plasma treatment device comprises a diameter change reaction container, a bearing shaft fixing and transmission device, a bearing shaft, a working electrode and turbulent flow fan blades. The diameter-variable reaction container is a cylinder of which the radius is gradually reduced, and sequentially comprises a water inlet, a turbulent flow section, three treatment sections and a water outlet; the inner side of the bearing shaft fixing and transmission device is fixed with the bearing shaft and drives the bearing shaft to rotate, and the outer side of the bearing shaft fixing and transmission device is fixed with the reaction container; a circuit is arranged in the bearing shaft; a working electrode is a needle-shaped tungsten electrode, each treatment section is provided with three annular belts, each annular belt comprises 12 electrodes, and the interval between every two adjacent electrodes is 30 degrees; the number of the turbulent flow fan blades is 12, and the turbulent flow fan blades are distributed at 30 degrees. According to the invention, to-be-treated water containing chlorinated organic matters and gas (Ar / O2 mixed gas) are pretreated into a gas-liquid mixture, a high-pressure reaction place is formed by virtue of a variable-diameter container, and high-temperature and high-energy plasmas are generated in a rotating electrode pulse type discharge manner, so that the chlorinated organic matters are efficiently pyrolyzed.

This invention provides an ESC electrostatic chuck, comprising a first aluminum nitride ceramic surface layer, a tungsten electrode layer, and a second aluminum nitride ceramic surface layer arranged sequentially. The tungsten electrode layer has a two-layer structure arranged symmetrically from left to right. The surface of the first aluminum nitride ceramic surface layer is densely covered with round protrusions with a diameter ranging from 40 to 60 nm. By adopting an aluminum nitride ceramic material layer structure, this electrostatic chuck, through multiple innovations of "high thermal conductivity aluminum nitride material + surface nanostructure + symmetrical electrode + composite temperature control," synergistically solves the industry problems of thermal conductivity, durability, adsorption stability, and temperature control uniformity in electrostatic chucks, which is of great significance for improving the process level and product yield of semiconductor manufacturing equipment.

This invention belongs to the field of welding technology, and particularly relates to a laser-TIG hybrid welding device and method that can increase weld width. Its features include a laser welding torch and a TIG welding torch. The TIG welding torch incorporates an ultrasonic micro-vibration component. The laser welding torch is connected to a laser generator, and the tail of the TIG welding torch is connected to a welding power source. The TIG welding torch contains a combined electrode, which includes a copper rod at the top and a tungsten electrode connected to the lower end of the copper rod. The ultrasonic micro-vibration component includes a transducer and an amplitude transformer connected to the transducer. The copper rod is located within the central hole of the transducer and the amplitude transformer. The tungsten electrode is connected to the amplitude transformer via an eccentric ceramic ring. A tungsten electrode sleeve is connected to the bottom of the amplitude transformer, and a nozzle is located on the outer side of the tungsten electrode sleeve. The bottom of the tungsten electrode sleeve is a concave mirror surface. The beneficial effects of this invention are: it is suitable for welding nickel-based alloys, significantly increases weld penetration, improves weld formation quality, enhances the welding capability of thick plates, and solves the welding problem of nickel-based alloy thick plates larger than 10mm.

The welding module and automatic welding equipment of the present invention relate to the field of welding technology. The welding module is used to weld gaps to be welded and includes a base, a gas protection device that sprays protective gas in parallel along a first direction to form a protective gas-enclosed space, a bent tungsten electrode disposed within the protective gas-enclosed space, a swinging device for driving the bent tungsten electrode to swing, and a wire feeding device. The gas protection device is disposed on the base. The bent tungsten electrode is used to form a molten pool at a predetermined position within the gap to be welded. The wire feeding device is used to transport welding wire into the molten pool. The protective gas sprayed along the first direction provides gas protection for the bent tungsten electrode, the gap to be welded, and the molten pool. This improves the adaptability of the product to the narrowness of the gap to be welded; furthermore, the single-channel parallel delivery of protective gas greatly simplifies the product structure; and secondly, the absence of a flat torch shell improves the ease of observation.

The present application belongs to the field of welding, and specifically discloses a kind of automatic welding method of circular tube, the method comprises the following steps: the melting ring is fixed between two circular tubes, then adopts tungsten argon arc welding to weld;The material of the melting ring is same with the material of the circular tube;The tungsten argon arc welding adopts tungsten electrode as negative electrode;The welding step is carried out under the protection atmosphere;The protection atmosphere is argon or the mixed gas of argon and helium;The welding current is 61-92A, the welding voltage is 12.3-13.5V, and the welding speed is 150-180mm / min.Adopt the welding method in the present application to weld, can make the weld have higher mechanical strength, the weld formability is good, the weld quality is excellent, and the welding method in the present application is simple and easy to operate, the welding process is flexible, can realize the full automatic full position welding of small diameter circular tube.

The tungsten electrode clamping tool comprises a handheld rod, a conical nut and an elastic chuck, a nut seat in threaded connection with the conical nut is arranged on the handheld rod, the elastic chuck is located in the handheld rod and the conical nut, and the elastic chuck comprises an elastic clamping part and an auxiliary clamping part which are connected in a penetrating mode. A plurality of movable openings are formed in the peripheral side of the elastic clamping part, the lower ends of the movable openings extend towards the auxiliary clamping part, a limiting opening matched with the auxiliary clamping part is formed in the nut seat and used for saving and stably clamping a tungsten electrode, and an opening in the upper end of the elastic clamping part is smaller than the inner diameter of the auxiliary clamping part. The auxiliary clamping part is communicated with the handheld rod, an embedding groove is formed in the lower side of the outer portion of the elastic clamping part, an elastic ring is arranged in the embedding groove in a sleeved mode, and the elastic ring is made of elastic materials. The tungsten electrode clamping tool has the advantages of being small in size, low in energy consumption, high in practicability and low in machining cost.

The utility model relates to a welding gun rocking mechanism for a welding device, and belongs to the technical field of welding. According to the technical scheme, the device comprises a rocking motor (501), a motor gear (502), a large gear (503), an installation block (509) and a welding gun frame (510), the installation block (509) is arranged on the welding gun frame (510), the motor gear (502) and the large gear (503) are installed on the installation block (509), the motor gear (502) is meshed with the large gear (503), and the motor gear (502) is connected with an output shaft of the rocking motor (501); a welding gun rod (504) is installed in the center of the large gear (503), and a bias tungsten electrode (505) is installed at the lower end of the welding gun rod (504). The utility model has the beneficial effects of compact structure, small volume, light weight and high motion precision, and can be used for welding in a narrow space, and the phenomena of a molten pool and an electric arc can be observed from two sides.

This invention relates to the field of welding equipment technology, specifically to an argon arc welding device for metal parts processing, comprising a welding torch rod, a flow guide installed at the head of the welding torch rod, a ceramic nozzle installed on the flow guide, a tungsten needle clamp installed inside the flow guide, a tungsten electrode penetrating inside the tungsten needle clamp, and a pressure cap installed at the tail of the welding torch rod. A spring is installed between the tungsten needle clamp and the flow guide. The welding torch rod has a sliding hole, and the end of the tungsten needle clamp slides axially within the sliding hole. The pressure cap has a threaded blind hole, and a contact member is threadedly connected to the threaded blind hole. The end of the contact member has a non-circular blind hole, and a hollow member is axially slidably installed within the non-circular blind hole. The end of the hollow member is fixedly connected to the end of the tungsten needle clamp. The end of the pressure cap is axially slidably connected to the sliding hole. A snap-fit ​​member is fixedly installed at the end of the pressure cap, and a snap-fit ​​groove that mates with the snap-fit ​​member is provided on the welding torch rod.

The invention provides a welding machine (100) and a method for igniting a plasma main arc (2). The welding machine (100) comprises: a tungsten electrode (101), a plasma nozzle (102), and a control device (120) configured to perform a plasma ignition sequence, which includes at least: Applying (S10) a first and second potential (V1, V2) to generate a pilot arc (1); Applying (S30) the second potential (V2) to a workpiece electrode (104) connected to a workpiece (4); Switching off (S40) the second potential (V2) to generate a main plasma arc (2); Check (S50) whether the main plasma arc (2) is burning and, if not, carry out (S60) a measure stage comprising reapplying (S61) the second potential to the plasma nozzle (102) and switching off (S62) the second potential (V2); and Check (S70) whether the action stage was successful and, if not, carry out (S110, S130) at least one further action stage, each comprising switching on an additional voltage source (131, 132).

A tool includes a handle having a proximal end and a distal end, wherein the handle includes a first cylindrical cavity extending into the handle from an opening in the distal end and having a first cylindrical wall. The tool further includes a radial bearing having an inner race, an outer race, and rolling elements, wherein the outer race is secured to the first cylindrical wall of the first cylindrical cavity. Still further, the tool includes a central shaft having proximal and distal sections, wherein the proximal section is secured to the inner race, and wherein the distal section extends from the first cylindrical cavity and includes external screw threads. The tool additional includes a chuck threadably coupled to the external screw threads, wherein the chuck includes self-centering jaws for selectively gripping a tungsten electrode along an axis of rotation established by the radial bearing.