85results about How to "Prevent burn through" patented technology

A base metal composed of a plurality of metallic materials having an oxygen content of 10 ppm is first preheated partly or overall. Then AC (alternating current) current is made to pass through the preheated base metal and an electrode so as to generate an arc for welding the metallic materials. The waveform of the current is changed with time between a peak current value and a base current value excluding a current of zero value only in one of plus and minus polarity sides of the current. A current ratio defined by dividing a current amplitude between the peak and base current values by a current average of the alternating current is a range of 0.5 to 2.0. The alternating current has a frequency of 500 Hz or higher.

The invention relates to an annular welding method. A welding gun is adopted to realize welding; a welding line of a workpiece is annular. The annular welding method is characterized in that welding comprises arc striking, normal welding and arc stopping; the welding current of an arc striking section between an arc striking point and an arc striking end point and the welding current of an arc stopping section between an arc stopping start point and an arc stopping point are lower than that of the normal welding; furthermore, the welding line of the welding line from the arc striking point to the arc stopping point rotates around an angle which is larger than 360 degrees. Due to a research, the quality of the annular welding line is greatly improved by changing welding technical parameters by the adoption of soft arc striking and soft arc stopping, so that the welding sealing property of end-to-end overlapped sections of the welding line formed in the arc striking and the arc stopping is guaranteed; the problem of welding missing is avoided; meanwhile, the phenomenon of burnthrough during welding is avoided, and the end-to-end overlapped section of the welding line is smoothly transitioned. The annular welding method is particularly suitable for welding on a barrel body or a pipe body with a high sealing requirement.

The invention relates to an AC arc welding system and a method thereof, belonging to the welding equipment and automation field. The system adopts a wire feeding mode of wire pushing and drawing. A power supply adopts an AC output mode. The system concretely comprises a welding power system and a wire feeding system. The welding power system mainly comprises a main circuit part (1) for providing power output for welding and a control circuit part (2) for controlling the output power of the main circuit. The wire feeding system adopts an AC servo motor as a wire feeding motor and controls an interface circuit (E) by the wire feeding system to receive signals sent by a DSP system (A). The wire feeding motor reciprocates to realize the wire pushing and drawing. Simultaneously, a welding power judges that the welding is in the short circuit/arcing state according to the feedback voltage to change the output polarity of the power. The droplet short circuiting transfer is finished under the function of welding pumpback tension. A small short circuit current is adopted. In addition, the straight polarity direct current is adopted at the arcing initial stage. More arc energy can be distributed to welding wires, and the heat input of base metal is lowered greatly.

The invention provides a power battery thermal protection system, which is used for carrying out thermal protection on a power battery pack. The power battery pack comprises an upper cover, a lower housing and a plurality of module integration modules which are located between the upper cover and the lower housing and are arranged in the first direction. The power battery thermal protection systemcomprises fireproof thermal insulation pads, which are arranged between the upper cover and the module integration modules, wherein the fireproof thermal insulation pads are in one-to-one correspondence with the module integration modules; and a battery pack explosion-proof valve, which is arranged on the inner side of at least one side edge, in the second direction, of the lower housing, whereinthe second direction is perpendicular to the first direction. The system realizes prolonging of time before the fire of a battery core breaks through a power battery housing when the battery core issubjected to thermal runaway due to heating, thereby leaving enough escape time for passengers, and guaranteeing the safety of the passengers.

The invention discloses a laser welding incident angle real-time regulating and controlling system based on temperature feedback and a welding method of the laser welding incident angle real-time regulating and controlling system. The welding system comprises a laser welding module, a welding control module, a clamper and an infrared temperature feedback module, wherein the clamper and the infrared temperature feedback module are arranged on the side wall of the laser welding module, one end of the clamper is fixed on the side wall of the laser welding module, and the other end of the clamperis connected with the infrared temperature feedback module; and the angle of the infrared temperature feedback module is adjusted through the clamping end of the clamper, so that an infrared thermometer can conveniently measure the temperature of a specific area. According to the laser welding incident angle real-time regulating and controlling system based on temperature feedback and the weldingmethod, the average temperature of the specific area can be detected in real time through the real-time regulating and controlling system; if the temperature is too high, the system correspondingly makes feedback, the incident angle of laser welding is adjusted, the incident distance of lasers in the material is increased, and the burnthrough phenomenon is effectively prevented. The system and method are particularly suitable for welding thin cover plate structures such as aluminum and a magnesium alloy.

The invention discloses a method for avoiding a metal taphole of a blast furnace from burning through. The method comprises the following steps: drilling a blind hole in the metal taphole by using a drill bit of a tapping machine; thoroughly purging the blind hole by utilizing high-pressure compressed air; uniformly mixing a corundum casting material and a nano sol binder to obtain a first castingmaterial capable of flowing and a second casting material capable of being molded; under the condition that a clay sleeve of the metal taphole is complete and clean, filling the blind hole with the first casting material; thoroughly eliminating the stemming in a gun head of a hydraulic clay gun, and filling the gun head with the second casting material; tightly pressing the gun head of the hydraulic clay gun on the clay sleeve of the metal taphole by adopting the operation of plugging the metal taphole, pressing the second casting material in the gun head into the blind hole by utilizing thethrust force of the hydraulic clay gun, suppressing the clay tapping pressure of the hydraulic clay gun to the upper limit of the plugging operation pressure, and keeping the pressure; and removing the hydraulic clay gun, and baking the clay sleeve region of the metal taphole by adopting naked flame. The processing steps can be performed during operation of the blast furnace without affecting normal production; and the involved equipment is less, and the processing steps are simple.

The ferritic stainless steel sheet contains, in mass %, C: 0.020% or less, Si: 0.6% or less, Mn: 0.5% or less, P: 0.04% or less, S: 0.010% or less, Al: 0.015% or more and 0.20% or less, Cr: 17.0% or more and 24.0% or less, Ni: less than 0.6%, N: 0.020% or less, Ca: 0.0002% or more and 0.0020% or less, and O: 0.0050% or less and further contains one or two selected from Ti: 0.01% or more and 0.45% or less and Nb: 0.01% or more and 0.55% or less, with the balance being Fe and unavoidable impurities. The ferritic stainless steel sheet satisfies (Ti+Nb×48/93)/(C+N)≧8.0 (where Ti, Nb, C, and N represent the contents (% by mass) of these elements, respectively).

The invention discloses an aluminum alloy non-penetration laser welding strengthening platform and method. A first mechanical arm and a second mechanical arm are respectively provided with a first laser head and a second laser head; a processing chamber is respectively connected with a water inlet pipe and a water outlet pipe; welding plates in butt joint are clamped and positioned by fixtures inthe processing chamber; the water inlet pipe is connected with a water pump; an amplitude change rod is fixed on the inner wall of the processing chamber; a working head of the amplitude change rod ispositioned under a preset water level upper limit; a blind way is formed in the center of the butt joint end surfaces of the welding plates before welding, so that the flowing-down speed of molten metal on the front wall of a key hole during welding is effectively lowered, and the burnthrough of the back parts of the welding lines or the formation of full-penetration welding is prevented; and thelaser impact processing is performed after welding to effectively refine grains on the surface layer of an aluminum alloy layer welding joint, so that the mechanical performance of the joint is improved. In addition, the laser welding and the laser impact technology are fused on one platform, and the laser impact processing is performed after the welding operation, so that the secondary positioning and clamping of workpieces are prevented, and the production efficiency and the automation level are improved.

The invention discloses a welding and repairing method and device for a thin-walled part. The welding and repairing method comprises the following steps: performing preheating and overheat preventingtreatment on the the thin-walled part, rolling or adhering a low-melting-point sheet metal to the back side of at the welded part of the thin-wall part, and using a melt fusing phase transformation latent heat unsteady efficient heat absorption principle to realize local efficient cooling of the thin-walled part to further prevent the phenomenon that the thin-walled part is excessively heated to cause deformation or burnthrough in the welding process.

The invention discloses a die for casting an aluminum-clad magnesium alloy composite material, which comprises a die seat (1), a movable insert plate (2) and a side surface clamping mechanism (3). The die seat is formed by connecting a baseplate (7) with side plates (4), (5) and (6) through fastening bolts. Grooves are processed on the side plates (4) and (5), which are in clearance fit with the movable insert plate (2), threaded holes are processed on the side plates (4) and (6), which are connected with the side surface clamping mechanism, and the side surface clamping mechanism is formed by connecting a clamping plate with a threaded push rod. By adopting the die for casting an aluminum-clad magnesium alloy composite cast ingot, the bottom surface and the peripheral side surfaces of an aluminum-clad box are well jointed with the die, uniform heat radiation of the composite cast ingot is realized, and burning through can be effectively prevented. In addition, the requirement on processing precision of dimension of the aluminum-clad box is low, and the cast ingot is convenient to detach and the like.

The invention discloses a method and device for disposing waste incineration fly ash in a low-energy-consumption, recycling and environment-friendly manner. The method comprises the following steps that: 1) 1480-1510 DEG C blast furnace slag is added into a melting furnace, fly ash is simultaneously or subsequently added, and an obtained mixture is fully stirred, and the addition amount of the flyash accounts for not more than 25% of the total mass of the blast furnace slag and fly ash; 2) the temperature of the composite slag in the melting furnace is kept at 1400-1450 DEG C, and the reaction time is kept for 20-40 minutes under the temperature; and 3) deslagging, cooling, and water quenching treatment are carried out to obtain powdery water granulated slag, and the powdery water granulated slag is used as cement aggregate after being subjected to fine grinding.

The invention provides a method for preparing ultrathin crystalline silicon double-sided solar cell. The method comprises steps of: firstly thinning a polycrystalline silicon substrate to 90-120[mu]mat 18-25 degrees centigrade for 2000-2300s by using a mixed solution of HF, H2O2 and an additive, wherein a textured structure is formed on the surface of the substrate during the thinning process; preparing a PN junction by roll diffusion, and using ultrasonic atomization of phosphoric acid, thereby being nontoxic and nonpolluting, and achieving a uniform diffusion junction; and disposing siliconnitride antireflection layers on the front and back sides of the substrate; finally forming finger electrodes on the front and back sides by a silk-screen printing and sintering process. The method is suitable for the production technology of polycrystalline silicon 90-120[mu]m thick. Compared with a method for preparing a conventional polycrystalline silicon cell 180[mu]m thick, the method can reduce the thickness of the cell under the premise of ensuring a fragmentation rate, ensures battery efficiency, is simple in process, and low in cost. The method also solves the problem that the thincell is likely to be bent and is fragile, and can be industrialized by experimental verification.

The invention discloses a fireproof door capable of realizing automatic door body cooling. The fireproof door comprises a door frame, a door head and a door body, wherein the door head is transverselyerected on the door frame; the door body is hinged to one side of the door frame; a water storage cavity in transverse arrangement is arranged inside the door head; a plurality of water outlet holesare formed at the lower end surface of the door head; a plug body made of PE plastic materials is embedded in each water outlet hole; a first water inlet pipe and a first smoke sensing switch are arranged at one side of the door head; the first smoke sensing switch is used for controlling the break-and-make state of the first water inlet pipe after detecting the smoke information in an indoor position; after the indoor temperature rises to 120 DEG C or higher, the plug body is naturally molten and softened to expose the water outlet hole; water flow flowing out from the water outlet hole is poured onto the door body to cool the door body; water mist is formed, so that the smoke is prevented from passing through seams on the periphery of the door body; the inside of the door body is hollowand forms an accommodating cavity; a second water inlet pipe and a second smoke sensing switch are connected under the door body. By adopting the technical scheme, the door body can be automaticallycooled; the smoke entering is prevented; the survival possibility of people in fire hazards can be effectively improved.

The invention discloses a fireproof device of electrical equipment. The fireproof device comprises a box body, wherein a heat insulting plate is fixed to the outer wall of the box body, a mounting groove is formed in the box wall of the box body, a heat insulating net is fixed to the inner wall of the mounting groove, fine sand fills the inner wall of the mounting groove, asbestos are fixed to theinner wall of the box body, an exhaust hole is formed in the center position of the top of the box body, an exhaust pipe is fixed to the inner wall of the exhaust hole, and a suction pump is connected to the top end of the exhaust pipe. By using the heat insulating plate, the heat insulating net, the fine sand and the asbestos, the fireproof device not only plays a role of blocking a fire source,but also prevents a burnthrough phenomenon of the box wall of the box body. By using a water pump, a water tank and a high pressure spray head to extinguish a fire source, the equipment is preventedfrom being damaged again. By using an electrical motor, a bidirectional threaded rod and a sealing door, the box body can be sealed when a fire happens, and meanwhile, vacuumizing is carried out directly by means of the exhaust pipe and the suction pump, combustible gas is blocked and extracted to achieve a fire-extinguishing effect.

The invention provides a method for cooling an air leaking flange of a supporting plate of a hot blast valve. The method comprises the following steps: winding an air leaking position by using a thin copper wire strand at first, and fastening and stressing through bolts of the flange; welding a cooling water tank to the lower part of the hot blast valve, and enabling the upper edge of the cooling water tank to be higher than the air leaking flange; respectively welding a water replenishing tube and a water draining tube to the upper part of the cooling water tank; connecting the water replenishing tube to a water tube through a ball valve and a cloth inserted hose, and meanwhile welding an overflow tube to the upper edge of the cooling water tank; then opening the ball valve on the water replenishing tube to carry out water replenishing; after water flows out from the water draining tube, adjusting the open degree of the ball valve, enabling water replenishing and water draining amount to be balanced, and cooling the flange submerged in cooling water through the flowing cooling water. The problem of rising of temperature caused by air leakage of the supporting plate of the hot blast valve can be controlled effectively, burn-through of the supporting plate is prevented, blast stopping accidents of a blast furnace are avoided, consumption of spare parts is reduced, repair costs are reduced, yield loss is avoided, and smooth production of the blast furnace is guaranteed.