88 results about "Arc blow" patented technology

The invention relates to a method for welding a large liquified natural gas storage tank. The method uses alternating rectangular wave current for welding with a welding parameter of between 8.156 and 24.32 KJ/cm and the interlayer temperature of energy input of between 18.9 and 24.32 KJ/cm of 300 DEG C, and selects low carbon type nickel-based welding wire. The method overcomes the problem of arc blow in welding, not only can avoid impact on 9 percent Ni steel during carbon gouging, but also can save welding materials and manpower so as to accelerate construction process and improve welding efficiency. Welding with the process can improve the cold temperature flexibility of a macrograin area of a welding zone, avoid generation of brittle tissue of a fusion area, avoid generation of cold and heat crack in welding, has excellent quality of weld joint, and effectively ensure the cold temperature flexibility of 9 percent Ni steel welding joints. The method well control the quality of the weld joint, and ensures the overall quality of the natural gas storage tank.

A system and method is provided in which each of a GMAW power supply and a TIG/plasma power supply are utilized in a common weld joint, where the waveforms from each of the power supplies are pulsed waveform which are pulsed out of phase which each other. Such a system minimizes arc interference and arc blow while at the same time increasing travel speed and throughput of a welding operation.

A system and method of welding is provided where welding power supply has a first output electrically coupled to a welding electrode and a second output electrically coupled to a switching mechanism. The welding power supply provides a welding current through either of the first and second outputs to weld at least one work piece. The switching mechanism has at least a first and second switch position, where the first switch position is coupled to a first position on the at least one work piece and the second switch position is coupled to a second position on the at least one work piece, which is remote from the first position. During welding the switching mechanism switches between the first and second switch positions to change a current path for the welding current during through the at least one work piece.

The invention relates to a low-voltage electrical apparatus used cleanliness environment-friendly type copper touching bar material and the method for preparing the touching point. The material forming (by weight ratio) is that the first phase conducting core is copper allowance, the second phase anti-analyzing material is pure rear-earth oxide or mixed rear-earth oxide 0.1%-0.5%, the third phase blending agent is anti-oxidant and arc blow-out function alloy elements 0-5úÑ.

The invention described herein generally pertains to a system and method related to reducing magnetic arc blow by adjusting a current welding waveform that is used to create an arc between a workpiece and an electrode. The invention can provide a welder system that includes a component that detects an amount of magnetic field related to arc blow, wherein a controller can adjust the current welding waveform to reduce the amount of magnetic field related to arc blow. In an embodiment, the welder system can utilize the current welding waveform with a first waveform portion that delivers a first amount of energy to the workpiece and a second waveform portion that delivers a second amount of energy to the workpiece. A controller of the welder system can be configured to adjust the first waveform portion or the second waveform portion to equalize, within a tolerance, the first amount of energy and the second amount of energy.

The invention described herein generally pertains to a system and method related to reducing magnetic arc blow and steering the arc with two or more ground connections on the workpiece. The invention employs an AC switch component that is configured to activate one of the two or more ground connections to complete an electrical connection via the arc between the electrode and the workpiece. The activated ground connection can be used to counteract a buildup of magnetic field due to arc blow. Moreover, AC switch component can be configured to manipulate a direction of an arc based on activated a ground connection. In addition, AC switch component can oscillate between two or more ground connections to agitate a puddle formed by an electrode to release gas from the puddle and reduce porosity of a resulting weld.

In the consumable-electrode pulse arc welding where the energization of a peak current Ip and a base current Ib are alternately repeated, the arc break caused by the magnetic arc blow is suppressed in a short time in the following way. When an arc is generated during an energization period Tb of the base current and the rising rate Dv of a welding voltage Vw becomes a predetermined reference rising rate Dvt or more with no short circuit being generated just before the voltage Vw becomes so, a judgement (t25) that the magnetic arc blow occurs is made to rapidly increase the base current to 200 A or more. Next, when the welding voltage Vw is decreased during the period of the magnetic arc blow, a judgement (t26) that the magnetic arc blow is ceased is made to return the base current Ib+Iu to the normal value Ib.

The invention discloses a stainless steel welding electrode special for an end socket and a preparation method of the stainless steel welding electrode. The stainless steel welding electrode special for the end socket is composed of a core wire and a coating wrapping the surface of the core wire. The core wire is a stainless steel core with few Si, S and P, and the weight of the coating is 30%-45%of the weight of the adopted core wire. The coating comprises, by weight percent, components including 5.0%-9.0% of marble, 10.0%-15.0% of dolomite, 2.0%-5.0% of cryolite, 0%-2.0% of fluorite, 30.0%-50.0% of natural rutile, 1.0%-3.0% of sodium potassium titanate, 2.0%-5.0% of compound mica, 4.0%-5.0% of feldspar powder, 6.0%-10.0% of micro-carbon ferro chrome, 3.0%-4.0% of electrolytic manganese,3.0%-4.0% of ferroferric oxide, 2.0%-5.0% of ferrotitanium and 0.8%-1.0% of CMC. The stainless steel welding electrode is good in slag flowability during welding, stable in electric arc, moderate inelectric arc blowing force, uniform in slag covering, small in spattering and good in deslagging and all-position operability.

The invention discloses a mining kilovolt-level double-pole single-breakpoint air isolation reversing switch, and relates to an electrical element. A double-pole single-breakpoint moving contact and grid type magnetic quenching devices are adopted. Working current switching-on/off capability reaches more than 630A. The grid type magnetic quenching devices are fixed in a transverse isolation groove of an upper cover. The transverse isolation groove of the upper cover and a corresponding transverse isolation groove of an upper cavity of an insulating seat form a closed space in which the grid type magnetic quenching devices are positioned. Each grid type magnetic quenching device comprises a cover, arc quenching grids, a run-on plate, a magnetic blowout coil, a concentrating flux core and a concentrating flux plate. The arc root of an opening arc is shifted downwards to the run-on plates under the action of an electric field, the blowout coils generate an excitation field through arc current, the excitation field generates an arc blowing magnetic field on the two concentrating flux plates through the concentrating flux cores, and the opening arc is struck into the arc quenching grids under the action of the arc blowing magnetic field to be quenched.

The invention irons out the defects of conventional line lightning protection measures, and provides a new lightning-protection trip automatic arc blow-out parallel gap system for a power distribution network. The system comprises a voltage detection unit, a control unit, two metal electrodes, and an automatic arc blow-out unit. The two metal electrodes are respectively electrically connected with two ends of an insulator, and a voltage detection unit is disposed on the metal electrodes. A signal output end of the voltage detection unit is connected with a signal input end of the control unit, and a signal output end of the control unit is connected with the automatic arc blow-out unit. The system is wide in application range, can adjust the distance of parallel gaps of different power distribution lines, and can achieve the flexible adjustment of the lines with different relay protection parameters. Arc extinguishing energy comes from lightning, and there is no need to obtain additional energy from a line or in other modes. Finally, the system can flexibly adjust the switching time of a coil according to the size of different lightning overvoltages, and guarantees no tripping while releasing the lightning overvoltage.

The invention discloses a kilovolt-level double-pole double-breakpoint air type isolation change-over switch for mines and relates to an electric element. A double-pole double-breakpoint movable contact and a magnetic blow grid arc-extinction device are utilized, and make-break capacity of working current can reach more than 630 A. Casings of the arc-extinction device are installed at the upper end and the lower end of an insulation seat respectively and serve as an upper cover and a lower cover of a switch casing, a sealing space is defined by the casings and the insulation seat, and the magnetic blow grid arc-extinction device is arranged in the sealed space. The magnetic blow grid arc-extinction device comprises the casings, arc-extinction grids, an arc striking plate, a magnetic blow coil, a magnetism conduction iron core and magnetism conduction plates. Under the effect of an electric field, the arc root of a brake-separating arc moves to the arc striking plate with the same electric potential as the arc root, the magnetic blow coil connected with the arc striking plate generates excitation through arc current, and the excitation generates an arc blowing magnetic field between two magnetism conduction plates through the magnetism conduction iron core. Under the effect of the arc blowing magnetic field, the brake-separating arc is introduced into arc-extinction areas of the arc-extinction grids to be extinguished.

The invention discloses an arc blowing device for a low-voltage circuit breaker. A bracket is arranged at the lower part of an arc extinguishing chamber; a connecting end at the front end of a static contact can be pivotally connected with the bracket; two first grooves are respectively arranged at the left side and the right side of the rear part of the bracket; magnetism-increasing parts are arranged on the first grooves; the bottom surfaces of the magnetism-increasing parts are fixedly arranged in the first grooves; the side surfaces of the magnetism-increasing parts upwards extend to the outer part of the arc extinguishing chamber; contact ends of a movable contact and the static contact are positioned between the side surfaces of the two magnetism-increasing parts or at the positions close to the front ends of the two magnetism-increasing parts; a connecting plate is arranged at the rear part of the bracket; a magnetic conducting part is arranged between the static contact and the intermediate section of the connecting plate and is also positioned below an arc extinguishing grid plate; the upper section of the magnetic conduction part extends into the arc extinguishing chamber and is parallel to the arc extinguishing grid plate at a clearance; the contact end of the static contact is inclined; the magnetism-increasing parts can be used for enhancing an arc blowing magnetic field and increasing the repelling-open speed of the static contact; and the magnetic conducting part can be used for centralizing a magnetic filed generated by the connecting plate at the electric arc to the part, so that the stay time of the electric arc at the contact is effectively reduced and the entrance of the electric arc into the arc extinguishing device is accelerated.

The invention relates to a high-voltage discharge demonstration system and method. The system comprises a touch integrated operation table, a voltage regulator, a boosting transformer, a simulation high-voltage wire, an arcing device, an arc blowing device and a grounded resistor; the voltage regulator is connected with the touch integrated operation table; the voltage regulator is connected with the voltage regulator; the simulation high-voltage wire is connected with the boosting transformer, and a discharge ball is arranged in the middle of a single phase of the simulation high-voltage wire; the arcing device comprises a push rod and a small ball arranged at the top end of the push rod, and the push rod is connected with the touch integrated operation table; the arc blowing device is connected with the touch integrated operation table; and the grounded resistor is connected with the small ball. By means of the method of the high-voltage discharge demonstration system, the high-voltage discharge phenomenon can be truly restored, and a student can personally experience the significance of the high-voltage safety distance; meanwhile, arcs are formed through the arcing device, and the injuries of high-temperature burns of the arcs can be visually observed. The system and the method are visual in effect, simple in device, novel in method and good in teaching treatment effect.

The invention aims to provide the high-efficiency arc extinguishing relay which is better in arc extinguishing effect and enables an electric arc not to be liable to rebound to a movable contact and astatic contact after the arc hits the inner wall of an insulating cover. In order to achieve the purpose, the invention adopts the following technical scheme that the relay comprises an outer shell,wherein an insulating cover and a yoke plate are arranged in the outer shell; the insulating cover and the yoke plate form a cavity for accommodating a moving contact and a static contact; the movingcontacts comprise a left moving contact and a right moving contact which are fixed at the left end and the right end of the moving reed; the static contacts comprise a left static contact corresponding to the left moving contact and a right static contact corresponding to the right moving contact, and magnetic steel used for arc blowing of electric arcs generated by breaking of the moving contactand the static contact is arranged in the cavity.

The invention provides an alternating-current and direct-current dual-purpose high-blowing-force cellulose welding rod which comprises a welding core and a coating, and the coating comprises the following components in parts by weight, 2-9 parts of rutile, 30-55 parts of microcrystalline fibers, 3-9 parts of carboxymethyl fibers, 3-9 parts of iron sand, 3-9 parts of ilmenite, 3-12 parts of high-carbon ferromanganese, 2-7 parts of titanium carbide, 2-7 parts of titanium dioxide, 5-15 parts of marble and 10-17 parts of magnesium carbonate. The cellulose welding rod can meet the outdoor operation welding requirements of large long-distance pipelines, petroleum pipelines and the like, slag removal is easy, welding bead forming is attractive, welding arc blowing force and single-face welding double-face forming are guaranteed, the mechanical property of welding seams is excellent, the cellulose welding rod can be used for welding of the large long-distance pipelines, the petroleum pipelines and the like, and the welding quality can be guaranteed.

The invention belongs to the field of automatic control of welding, mainly relates to a TIG welding gun, and discloses a hot wire TIG welding gun with three tungsten electrodes. The hot wire TIG welding gun aims to solve the problem that arc power of traditional TIG welding is limited due to the limited current loading capacity. The hot wire TIG welding gun comprises a hollow gun body, one side of the gun body is provided with a gun head, the other side of the gun body is provided with a gun tail, a conductive nozzle is arranged at the gun head, a wire feeding tube and the multiple tungsten electrodes are arranged in the gun body, one end of the wire feeding tube and one ends of the tungsten electrodes extend from the inner part of the gun body to the outside of the conductive nozzle, the central axis of the wire feeding tube is parallel to the central axes of the tungsten electrodes, and the tungsten electrodes are uniformly distributed in the circumferential direction of the wire feeding tube. According to the hot wire TIG welding gun, the technological problems such as arc blow and hot wire feeding position fluctuation generated during welding by a TIG welding device adopting external resistors to heat and preheat welding wires are effectively solved.

The invention discloses an arc extinguishing device of a circuit breaker, and relates to the technical field of the circuit breaker. The arc extinguishing device is arranged in a circuit breaker casing, and comprises an arc extinguishing cover. The device is characterized in that the arc extinguishing cover is made of a three-surface enclosure vulcanized paper sheet with enlarged integral size, the interior of the arc extinguishing cover is provided with 14 arc striking plates which are used for separating electric arcs from cooling the electric arcs, the wire inlet end of the arc extinguishing device also comprises a connecting plate, the connecting plate is a triangular loop meeting a right hand rule, and each arc striking plate is provided with a Y-shaped opening with enlarged size to facilitate the electric arcs to enter. The arc extinguishing device has the advantages that the capability of separating the electric arcs from cooling the electric arcs is improved, the connecting plate at the wire inlet end adopts the triangular loop design meeting the right hand rule, a strong arc blowing magnetic field is always formed for alternating current, the electric arcs are forced to quickly enter an arc extinguishing chamber, the movement time of the electric arcs is shortened, and the arc extinguishing effect is greatly improved; the structure is simple, the economy is good, and the opening capability of the circuit breaker is obviously improved.

The invention discloses an arc-extinguishing device of a breaker. The arc-extinguishing device comprises an arc extinguish chamber device and an arc insulating device. The arc insulating device includes two flash barriers; and the arc extinguish chamber device includes a plurality of arc-extinguishing grid plates that are arranged between the two flash barriers at a uniform interval. Besides, the arc-extinguishing device is characterized in that air dispersion holes that are in a latticed shape are opened on each of the flash barriers. According to the invention, local air pressures inside the arc-extinguishing device can be effectively reduced when a breaker is broken; and an arc blow-out effect can be enhanced. When the provided arc-extinguishing device is applied to a breaker, working stability of the breaker can be effectively improved and cost can be saved.