44results about How to "Improve the success rate of arc striking" patented technology

The invention provides an arc striking control method and device. The arc striking control method is used for manual arc welding and comprises the steps of judging whether the current arc striking of manual arc welding is within the preset time or not; if not, carrying out arc striking of manual arc welding by the adoption of a first arc striking control mode; and if yes, carrying out arc striking of manual arc welding by the adoption of a second arc striking control mode. The arc striking control scheme disclosed by the invention can improve the arc striking success rate.

Disclosed are a 200KW non-transferred arc plasma generator and an arc-striking method. A negative pole and an insulating sleeve, a clearance, a small positive pole and an adjustable insulating seat, a main gas ring, a second positive pole, an outside seal, an adjusting nut and a big positive pole are arranged sequentially along the injecting direction. The negative pole is of solid red copper, an outer ring of the negative pole is a stainless steel sleeve, and a cooling waterway is formed between the negative pole and the stainless steel sleeve. Each positive pole is of red copper with a center hole and a cooling waterway, a threaded junk ring and a special-shaped flange which can be adjustably connected at an axial direction are arranged outside each positive pole. Inert gases serving as assistant gases are ventilated to the top of the small positive pole; and main gases and protection gases are screwed in the second positive pole and the top of the big positive. The negative pole of the direct current power is connected with the negative pole of the plasma generator; the positive pole of the direct current power is connected with three positive poles of the plasma generator, and each positive pole is provided with an arc-transferring switch. Multiple positive poles are used for increasing the arc pressure, so that the power can be reached to 200KW. The main gases and protection gases are screwed in to produce stable and uniform arcs. Water-cooling is used for meeting the cooling requirements for high powers. The negative poles are arranged at the rearmost end to guarantee convenient installation and replacement. Control parameters can be altered by distance adjustment, so that the service life is prolonged. The 200KW non-transferred arc plasma generator and the arc-striking method can be used for waste detoxifying treatment, fire-resistant heat-insulating material melting production for ore smelting, radioactive waste treatment and funeral-interment and cremation industry.

The invention provides a circuit for increasing the small current arc striking successful rate and stability of an inverter argon arc welding machine. The circuit comprises an inverter welding machine main loop circuit and an output loop arc stabilizing circuit, wherein a double-tube and single-end forward topology circuit is adopted as the inverter welding machine main loop circuit which inverts direct current obtained after input alternating current is rectified into high-frequency square wave current and then rectifies the square wave current into low-voltage direct current needed by the inverter argon arc welding machine to output the low-voltage direct current; and the output loop arc stabilizing circuit is connected into the inverter welding machine main loop circuit in series and used for controlling the working state of the inverter argon arc welding machine. According to the circuit for increasing the small current arc striking successful rate and the stability of the inverter argon arc welding machine, due to the fact that the measures that the arc stabilizing circuit works during arc striking with small current and arc striking with large current and the arc stabilizing circuit only works with small current in the welding process are taken, the size of the arc stabilizing circuit is greatly reduced, cost is saved, the effect of increasing the small current arc striking successful rate and stability can be achieved, and the circuit is economical and applicable.

The invention discloses a method of controlling the arc strike of a carbon dioxide gas shielded welding machine by adopting digital pulse. The method comprises the steps of feeding gas for a welding gun; feeding a welding wire in a slow wire feeding mode; when the output voltage is detected to be 0 volt, outputting a 250-500 ampere short-circuit current pulse signal to the welding wire for arc strike; when the output voltage is detected to be smaller than 8 volts, switching from the slow wire feeding mode of the welding wire into a quick wire feeding mode, outputting a 250-500 ampere short-circuit current pulse signal to the welding wire to build a molten pool, and controlling an arc to be subjected to transition from arc strike to a stable arc. According to the method, the transient impact stress which is borne by a hardware power device is reduced, and the service life is prolonged; the arc strike time is shortened, the arc strike process is stable, the reliability is strong, and the arc strike success rate is high; the molten pool is built in the arc strike process, and thus a basic is established for normal, stable and reliable welding in the future. The invention further discloses a carbon dioxide gas shielded welding machine.

The invention provides a high-power SiC submerged arc welding power supply. The high-power SiC submerged arc welding power supply is characterized by comprising at least one main circuit and digital control circuit; each main circuit comprises an electromagnetic noise inhibition module, a power frequency rectification filter module, a SiC inverse transformation current module, a high-frequency power transformer and a high-frequency quick rectification smooth module connected in sequence; the high-frequency quick rectification smooth module is connected with an arc load; the digital control circuit comprises a DSC control system, a human-computer interaction module, a safety protection module, an ultrahigh-frequency driving module and an electric signal detecting module; the ultrahigh-frequency driving module is connected with the SiC inverse transformation current module; the safety protection module is connected with the SiC inverse transformation current module; and the electric signal detection module is respectively connected with the high-frequency power transformer and the high-frequency quick rectification smooth module. A SiC power switch tube can be applied to the submerged arc welding power supply, so that the inversion frequency is greatly improved, the efficiency is high, the size is small, and the welding quality is improved.

The invention discloses a split type multifunctional underwater arc welding power supply which comprises a shore power supply module and an underwater power supply module. The shore power supply module comprises a shore power supply main circuit unit and a shore power supply control unit; the shore power supply main circuit unit comprises an input filter circuit, an IGBT full-bridge inverter circuit, an intermediate frequency transformer and an output rectification filter circuit; the underwater power supply module comprises an underwater power supply main circuit unit and an underwater power supply control unit; the shore power supply module is arranged on the shore; and the underwater power supply module is carried underwater. An integrated arc welding power supply directly arranged on the shore in the prior art is designed in a split mode, and real-time adjustment of the welding state during underwater welding can be achieved.

The invention provides a novel method for hot cutting. The method is characterized by comprising the following steps that: alternating current is fed into an inverter to generate medium frequency alternating current after being subjected to rectifying, wave-filtering and chopping; and the medium frequency alternating current is subjected to voltage reduction by a power transformer, and secondary rectifying and wave-filtering to form stable direct current to be supplied to cutting arc. The method has the advantages that dropping characteristic is set to generator characteristic, so that the method has high success probability of arc generation and low power consumption; inverter technology is the key point of realizing high power output by an inverse air plasma cutting power supply, IGBT is used as a switch element, and a full-bridge inverse circuit is adopted, so that quick and low power consumption controllable alternating current output can be realized; drive power can be effectively improved, optimal drive voltage is selected, and implementation of overvoltage overcurrent protection is the basic use principle of the IGBT module; and reasonable selection of the medium frequency transformer can improve system reliability.

The invention provides an auxiliary arc striking and arc length control shielded metal arc welding gun system for manual operation. A device comprises a miniature sliding table mechanism capable of driving an electric arc to move up and down, a fixing seat used for installing the miniature sliding table mechanism, a welding clamp used for clamping a welding rod, a grip, a chuck used for connecting a cable and the welding clamp, a Hall voltage sensor used for detecting welding voltage, and a control circuit board used for controlling automatic arc striking, arc length compensation and the like for shielded metal arc welding. The miniature sliding table mechanism can drive an electric arc to slightly move up and down in the length direction of the electric arc or in the direction similar to the length direction of the electric arc when a welding rod is manually fed, so that the length of the welding electric arc is finely adjusted, the arc length change caused by non-uniform feeding speed of the welding rod in the manual shielded metal arc welding process is compensated, the electric arc length is kept unchanged, and the arc stability is improved.

The invention discloses a high-deposition low-heat-input plasma-double-wire bypass electric arc welding device and method. The welding device comprises a plasma arc loop assembly, a double-consumable-electrode electric arc loop assembly and a coordination control unit. The plasma arc loop assembly comprises a plasma arc power supply, a conductive piece, a plasma annular electrode and a workpiece; the double-consumable-electrode arc loop assembly comprises an MIG/MAG power source, a composite welding gun, a bypass welding gun composed of a conductive fixing piece and a conductive nozzle, and a welding wire. During welding, the bypass welding wire electrode is used for replacing a workpiece molten pool electrode to serve as a cathode of an original MIG electric arc, that is, the bypass welding wire electrode and a welding wire anode of the original MIG electric arc form a double-consumable-electrode pair, a double-consumable-electrode electric arc arranged in a plasma arc is formed, and the high-deposition low-heat-input welding process is completed. Decoupling control between heating power input of a workpiece molten pool and metal deposition is achieved, so that heating power input of an MIG electric arc to a workpiece is reduced, the metal filling capacity of the MIG electric arc is enhanced, and the welding efficiency is improved.

The invention relates to a gas flow control method of an air plasma cutting machine. The method comprises the following steps that a gas flow database is built; parameters of the board thickness H, the current I and the cutting speed S are input in a numerical control system before cutting is started, and a matched gas flow phi 1 of the gas flow database is searched; in the cutting process, an actual gas flow signal phi 2 is detected, and after a control unit compares the matched gas flow phi 1 with the actual gas flow signal phi 2, the actual gas flow phi 2 and the flow deviation delta phi are obtained; an executing mechanism controls a gas valve through the flow deviation delta phi, and the flow deviation delta phi tends to zero. The invention further relates to a gas flow control system of the air plasma cutting machine. The gas flow control system of the air plasma cutting machine comprises the numerical control system, the gas valve, a gas detection switch, a sensor and a cutting gun, and further comprises a power control board, wherein the power control board comprises a control unit and a storage; the control unit is connected with the storage; the numerical control system, the power control board, the gas detection switch and the gas valve are sequentially connected and then are connected with the sensor and the cutting gun; the control unit is connected with the sensor. The cutting gas flow is best matched with the cutting current and the cutting speed, and the gas flow control method and system have the advantages that plasma jet flow can be stably formed and an electric arc is stable.