38results about How to "Stable weldability" patented technology

The invention provides a cable type welding wire. The cable type welding wire comprises a center welding wire and n peripheral welding wires arranged around the center welding wire in a spiral rotating manner, wherein the diameter of each of the peripheral welding wires is d, and the neighboring peripheral welding wires are separately arranged in an intersecting manner. The cable type welding wire is characterized in that the lay length T of each of the peripheral welding wires is equal to K*m*d, wherein K is the structure factor of the peripheral welding wires, m is the lay length multiple, and d is the diameter of each of the peripheral welding wires; K is larger than or equal to 1, and less than or equal to 1.5; m is larger than or equal to 20, and less than or equal to 25. According to the cable type welding wire provided by the invention, wire breakage is not liable to generate in the manufacturing process; during welding, the peripheral welding wires are arranged compactly, so that the wire feeding process is more stable, and the welding performance of the cable type welding wire is improved.

The invention relates to a multifunctional double-reinforced horseshoe fillet welding machine which comprises a rack, wherein a down-pressing oil cylinder, a reinforcing plate fixing device and an up-pressing oil cylinder are arranged on the rack in sequence from top to bottom; the reinforcing plate fixing device comprises a grip cylinder and a reinforcing plate clamping device; the down-pressing oil cylinder is arranged right above the reinforcing plate clamping device; the up-pressing oil cylinder is arranged under the reinforcing plate clamping device; a welding gun is arranged on each of the left side and the right side of the reinforcing plate clamping device. The multifunctional double reinforced horseshoe fillet welding machine provided by the invention is applicable to positioning and welding of an outside fillet weld formed by an arc-shaped panel and a reinforcing plate of an automobile brake shoe assembly; when the multifunctional double reinforced horseshoe fillet welding machine works, a panel compression device presses a panel on a reinforcing plate, the original three successive processes such as plug welding, fillet welding and transposition welding are changed into an operation which can be completed at a time, so that both labor and time are saved, and a client's problems of labor shortage and high cost are solved.

The invention discloses a method for preparing tungsten-yttrium square billets, which comprises the following steps: a. dispersing yttrium nitrate aqueous solution in a spraying mode evenly and coating the yttrium nitrate aqueous solution on the surface of ammonium paratungstate, and performing mixing agitation, heating, and drying at the same time to obtain tungsten-yttrium coating powder after drying; and b. performing primary and secondary reductions, compaction, presintering and incipient fusion sintering on the tungsten-yttrium coating powder to be prepared into the uniform tungsten-yttrium square billets with metallicity, wherein the incipient fusion sintering process comprises that the temperature is increased for 10 to 30 minutes and the temperature is kept for 20 to 50 minutes, and the electric current in the process of keeping the temperature is between 2,500 and 4,000 amperes. The method has a simple process and prepares the tungsten-yttrium coating powder by adopting the spraying mode, thus the even distribution degree of elements added to square billet raw materials is ensured, and the tungsten-yttrium coating powder with comparatively even dispersion; besides, the process of the subsequent incipient fusion sintering is controlled to raise the temperature for 10 to 30 minutes, keep the temperature for 20 to 50 minutes, and keep the electric current in the process of keeping the temperature between 2,500 and 4,000 amperes, thus each point of the prepared tungsten-yttrium square billets is volatilized evenly; and under the cooperation of the method and the incipient fusion sintering, the prepared tungsten-yttrium square billets have good evenness.

The invention discloses a normalized DH36 steel plate for wind power and a preparation method thereof. The preparation method comprises the following steps of weighing all components according to requirements, and mixing to obtain molten iron; carrying out KR mechanical stirring desulfurization on the molten iron; carrying out converter oxygen blowing smelting; carrying out LF refining; carrying out RH vacuum treatment; feeding wires; carrying out soft stirring; carrying out continuous casting on a plate blank; reheating the plate blank; carrying out rough rolling; carrying out warm-keeping cooling on an intermediate blank; carrying out finish rolling; carrying out accelerated cooling; discharging from a production line and carrying out pile cooling and discharging; carrying out ultrasonicflaw detection; carrying out shot blasting; normalizing; carrying out accelerated cooling on the steel plate; carrying out fire cutting; and warehousing. In the reheating stage of the plate blank, the heating temperature is controlled to be 1150-1250 DEG C, and the in-furnace time is not less than 1.0min / mm; the rough rolling temperature is controlled to be 1000-1100 DEG C, and the final rollingtemperature is 860-900 DEG C; and the normalizing temperature of the steel plate is 880-900 DEG C, the normalizing in-furnace time is not less than 2.0min / mm, and the cooling temperature after normalizing is 540-600 DEG C the steel plate disclosed by the invention has the advantages of good performance, low production cost, thick applicable thickness and good application prospect.

The invention relates to a welding technique for a crystalline silicon cell of a photovoltaic module. The welding technique is characterized by comprising the following steps that (1) tin paste which can be lead-contained tin paste and can also be more environment-friendly lead-free tin paste is printed on a main grid line on the surface of the cell; (2) a solder strip which can be a lead-contained solder strip and can also be a more environment-friendly lead-free solder strip is attached to the tin paste on the main grid line of the cell, a welding surface and a non-welding surface are arranged on the front side and / or the back side of the solder strip, and the cell is connected with the welded surface of the welding surface of the solder strip when the solder strip is attached to the cell; and (3) the cell and the solder strip are placed in a reflow soldering furnace together to be integrally heated, the temperature of the front section of the reflow soldering furnace is 130-200 DEG C, the temperature of the rear section of the reflow soldering furnace is 140-230 DEG C, the cell and the solder strip are heated for 1-3 minutes in the front section of the reflow soldering furnace, the cell and the solder strip are heated for 0.5-2 minutes in the rear section of the reflow soldering furnace, and the cell and the strip are cooled to the room temperature at the speed of 2-4 DEG C / s after reflowing, so that tin paste solder is solidified. By the adoption of the welding technique, the welding speed is increased, and the reliability of a welded cell string is high; in addition, lead can be avoided, environmental friendliness is achieved, and cost is low.

The invention provides a process for manufacturing a blood bag and an infusion bag by using three steps and three stations. The process for manufacturing the bags comprises the following steps of: 1, automatically conveying an upper membrane, a lower membrane and bag manufacturing accessories required for manufacturing the bags through a conveying device on a production line and positioning the upper membrane, the lower membrane and the bag manufacturing accessories on a first high frequency machine, of which the top and the bottom are connected with high frequency and a middle positioning element is grounded, for fusing the accessories with the upper membrane and the lower membrane; 2, automatically conveying and positioning the membranes and the accessories which are subjected to the first step to a second high frequency machine, of which an upper mould is connected with high frequency and a lower mould is grounded, for fusing heads of the two membranes; and 3, automatically conveying and positioning the membranes subjected to the second step together with fused accessories on a third high frequency machine, of which an upper mould is connected with high frequency and a lower mould is grounded, for fusing the rest parts of the two membranes. After the scheme is used, switching of welding modes is avoided, and the structure is simplified, so that the fusing performance is more stable and the auxiliary time is shortened.

The invention provides a cable type welding wire. The cable type welding wire comprises a center welding wire and n peripheral welding wires arranged around the center welding wire in a spiral rotating manner, wherein the diameter of each of the peripheral welding wires is d, and the neighboring peripheral welding wires are separately arranged in an intersecting manner. The cable type welding wire is characterized in that the lay length T of each of the peripheral welding wires is equal to K*m*d, wherein K is the structure factor of the peripheral welding wires, m is the lay length multiple, and d is the diameter of each of the peripheral welding wires; K is larger than or equal to 1, and less than or equal to 1.5; m is larger than or equal to 20, and less than or equal to 25. According to the cable type welding wire provided by the invention, wire breakage is not liable to generate in the manufacturing process; during welding, the peripheral welding wires are arranged compactly, so that the wire feeding process is more stable, and the welding performance of the cable type welding wire is improved.

The invention provides a three-position bag welding mechanism. The three-position bag welding mechanism comprises a bag welding pipe position die, a bag welding head position die and a bag welding edge position die, wherein the bag welding head position die is connected between the bag welding pipe position die and the bag welding edge position die in parallel, and is respectively in ordered fit with the bag welding pipe position die and the bag welding edge position die. The three-position bag welding mechanism avoids conversion between welding modes, enables the welding performance to be more stable and shortens the auxiliary time.

The invention provides a welding equipment structure which comprises a wire feeding device, a welding gun and a shell. The welding equipment structure is characterized in that the shell is a cuboid and comprises a containing part and a turning cover board, wherein the containing part is composed of a bottom board, a left side board, a right side board, a front board and a rear board, and the turning cover board can be opened and closed relative to the containing part. A buckling connecting device is arranged at the end, close to the front board, of the turning cover board and comprises an elastic element fixed to the turning cover board, a protruding part fixed to the portion close to the free end of the elastic element and protruding outwards and a kidney-shaped hole formed in the front board and corresponding to the protruding part.

The invention discloses and provides a multilayer interconnection FPC with a rapid tin guide via hole, which is simple in structure, high in material utilization rate, capable of rapidly fusing enoughsoldering tin during welding and stable in performance. The FPC comprises a main FPC and an auxiliary FPC, the main FPC is provided with a main output area and a main input area, and the auxiliary FPC is provided with an auxiliary output area and an auxiliary input area; a main output bonding pad is arranged in the main output area, a main input bonding pad is arranged in the main input area, anauxiliary output bonding pad is arranged in the auxiliary output area, an auxiliary input bonding pad is arranged in the auxiliary input area, and tin guide via holes are formed in the auxiliary output bonding pad and the auxiliary input bonding pad; each of the main output bonding pad and the main input bonding pad is provided with at least one exhaust hole; a metal layer is plated in the tin guide via hole, and the metal layer of the tin guide via hole on the auxiliary input bonding pad is connected with the auxiliary input bonding pad; soldering tin is fused into the tin guide via hole, andthe main input bonding pad and the auxiliary output bonding pad communicate through the soldering tin. The multilayer interconnection FPC is applied to the technical field of FPC production.

The invention discloses a method for producing a tungsten-yttrium electrode, which comprises: a. yttrium nitrate water solution is evenly mixed with a solid material containing ammonium paratungstate(APT) or tungsten trioxide(WO3) in the mode of spray mixing, and heated and dried to prepare tungsten-yttrium coating powder; b. the prepared tungsten-yttrium coating powder is reduced twice to obtain tungsten-yttrium powder, and the tungsten-yttrium powder is pressed and sintered to obtain a tungsten-yttrium cored bar; and c. by adopting the pressure processing forging method, the prepared tungsten-yttrium cored bar is made into the tungsten-yttrium electrode. In the method, the yttrium nitrate water solution is evenly mixed with the solid material containing the ammonium paratungstate(APT) or the tungsten trioxide(WO3) in the mode of spray mixing; due to the spraying mode, the yttrium nitrate water solution coats the surface of the ammonium paratungstate(APT) or the tungsten trioxide(WO3), so the mixing, stirring and drying of the yttrium nitrate water solution and the solid material are completed together, thereby achieving the aim of preparing the even tungsten-yttrium coating powder, improving the production capability, making the coating powder more even and effectively improving the performance of the tungsten-yttrium electrode in welding.

The invention relates to the technical field of coating brazing filler metal, in particular to coating brazing filler metal and a preparation method and application thereof. The coating brazing filler metal comprises a brazing filler metal inner core and a brazing flux layer wrapping the outer surface of the brazing filler metal inner core, the brazing filler metal inner core is of a hollow structure or a solid structure, the brazing flux layer is provided with a hole structure, the cross section area of the solid structure is rectangular or circular, and the hollow structure comprises an annular structure or a spiral annular structure formed by winding brazing filler metal wires. Through cooperation of the brazing filler metal and the hole structure brazing flux layer and arrangement of a specific structure, the melting speed is high, and the brazing efficiency is high; and the effects that the coating brazing filler metal is high in adhesive force, small in coating loss in the transportation process, convenient to store, stable in welding performance and the like can be achieved without adding a binder.

The invention discloses a welding process of a plunger assembly of a hydraulic buffer. The welding process comprises the following steps that firstly, a bottom plate and a base are correspondingly arranged in a left end hole and a right end hole of a plunger one to one, so that a plunger assembly to be welded is formed; secondly, the plunger assembly to be welded is placed on an auxiliary support of a welding tool, then the height of the auxiliary support is adjusted, a right-end ejector pin abuts against a central hole of a base plate, and a left-end ejector pin abuts against a central hole of the bottom plate; thirdly, a welding control button is started, a welding nozzle of a welder is made to get close to the welding position, at the left end, of the bottom plate and the plunger first, arc starting is conducted, meanwhile a servo motor on the welding tool drives the plunger assembly to rotate, welding is conducted in a circle, a robot is made to turn around, the welding nozzle of the welder is made to get close to the right end, and the welding position of the base plate and the plunger is welded automatically. According to the welding process, clamping time and welding time can be shortened, welding performance is stable, welding quality is high, and work efficiency is high.

The invention discloses a pillow-shaped plate type heating radiator which is connected with an outdoor heating unit correspondingly. The heating unit comprises a throttling device, an evaporator and acompressor which are connected in sequence correspondingly. The pillow-shaped plate type heating radiator comprises a pillow-shaped plate type cooling fin. The pillow-shaped plate type cooling fin isformed in the mode that two metal sheets are overlapped and welded together through laser penetration, then the position between the metal sheets expands through a high-pressure fluid, and accordingly, a unilateral pillow-shaped plate type cooling fin or a bilateral pillow-shaped plate type cooling fin with an internal channel and the surface in a wave shape is formed. The pillow-shaped plate type heating radiator is good in heat conductivity, a pillow-shaped wavy structure enhances the heat exchanging performance, through laser melting penetration welding, the loading capacity is high, and the welding performance is stable; compared with a tubular radiator, the accommodating area in a unit space is large; and by adopting the metal sheet type cooling fin, the problem of pipeline freezingis solved, the heating speed is high, quick heating is achieved, system operation is reliable, and the number of the pillow-shaped plate type cooling fin can be increased according to the indoor areasize.

The invention discloses a welding device and a welding method for an aluminum alloy thin-wall water-cooled container, and relates to the field of welding tools. The welding device comprises a heat dissipation core rod and an end fixing plate, the heat dissipation core rod is of a step shaft structure and comprises a large end and a small end, the diameter of the large end is larger than that of the small end, a screw hole is formed in the center of the end of the small end, and the end fixing plate is fixed to the end of the small end through a bolt matched with the screw hole. According to the aluminum alloy water-cooling container welding device and the welding method using the device, the defects that a thin-wall thin-diameter aluminum alloy water-cooling container is poor in welding seam forming, the welding seam is not fused, and the number of welding seam air holes is large are overcome, and the welding quality and efficiency of the thin-wall thin-diameter aluminum alloy water-cooling container are improved.

The invention relates to a welding stress frame used for a light enclosure wall structure of a vessel. The welding stress frame comprises a conveying structure used for conveying the light enclosure wall structure and a fixed welding system used for fixing the light enclosure wall structure and conducting welding operation, the fixed welding system comprises a welding portal frame which is arranged on the conveying system in a crossed mode, a welding tractor is arranged on a cross beam of the welding portal frame, a compressing hydraulic cylinder used for compressing the light enclosure wall structure from above is arranged below the cross beam, the welding stress frame further comprises a supporting system used for compressing the light enclosure wall structure from below, the light enclosure wall structure is compressed and fixed through the compressing hydraulic cylinder from above and the supporting system from below respectively, the deformation of the light enclosure wall structure in the welding process can be effectively controlled without hoisting a pressing plate, the welding performance is stable, the welding quality is guaranteed effectively, the safety performance is high, the automatic welding for welding joints can be achieved through program control, the welding efficiency is greatly enhanced, it is facilitated to shorten the assemble welding cycle of a wallboard, and the construction cost of welding is reduced.

The invention discloses a welding wire for die-casting aluminum alloy and a preparation method thereof, and belongs to the field of manufacturing of aluminum alloy welding wires. The welding wire for the die-casting aluminum alloy comprises, by mass, 10%-13% of Si, 0.3%-0.5% of Mn, 0.2%-0.3% of Zr, smaller than or equal to 0.2% of Mo, 0.02%-0.05% of Sr, 0.05%-0.15% of Ti, smaller than or equal to 0.15% of Fe and the balance is Al and inevitable impurities, the mass percentage of a single impurity is smaller than or equal to 0.05%, and the total mass percentage of the inevitable impurities is smaller than or equal to 0.15%. The preparation method comprises the steps of semi-continuous casting, machining, preheating, extruding, annealing, wire stretching and welding wire drawing. The welding wire solves the problems that the internal structure is poor, the joint strength is low, air holes, slag inclusion, cracks and the like are prone to occurring in the welding process when a current commercially available welding wire is adopted for welding die-casting aluminum alloy.

The invention relates to a magnetic jig which comprises a magnetic pressure board and a magnetic carrier board. A plurality of magnetic beads are arranged in the magnetic carrier board, and the size and the number of the magnetic beads are adjusted to control the attraction force of the magnetic carrier board to the magnetic pressure board. The invention relates to a multilayer interconnection FPCwelding method, which comprises the magnetic jig and comprises the following steps of: S1, reinforcing the bottom of a main board; S2, carrying out tinning processing on a main output bonding pad anda main input bonding pad; S3, pasting a layer of double faced adhesive tape on the surface, close to a secondary board, of the main board or the surface, close to the main board, of the secondary board; S4, aligning the main board with the secondary board, and attaching the secondary board to the main board after alignment; and S5, placing the secondary board and the main board on a magnetic carrier board, pressing the magnetic pressure board onto the secondary board by using magnetic attraction of the magnetic pressure board and the magnetic carrier board, and applying proper pressure to themagnetic pressure board. According to the invention, poor welding caused by surface tension can be improved.

The invention relates to a multilayer interconnected electronic circuit board, which comprises a main board and one or more secondary boards. Each secondary board is a single-sided window board, and the area of each secondary board is smaller than that of the main board. The surface, far away from the main board, of each secondary board is provided with a jumper circuit and a butt-joint bonding pad, and the butt-joint bonding pad is directly communicated with the jumper circuit. Each secondary board is provided with a window at a position corresponding to the butt-joint bonding pad, and the window exposes the butt-joint bonding pad with a proper size. The main board is provided with bonding pads at the positions corresponding to the butt-joint bonding pads of the secondary boards, and thebonding pads penetrate through the windows to be connected with the butt-joint bonding pads. The material utilization rate is high, and the cost can be effectively reduced.

The invention discloses a high-performance magnesium-lithium alloy welding wire and a preparation method and application of the high-performance magnesium-lithium alloy welding wire. The welding wireis prepared from, by weight, 86-88% of Mg, 3.0-5.0% of Al, 0.002-0.005% of Zn, 0.001-0.004% of Ca, 0.001-0.003% of Cu, 0.002-0.006% of Ag and the balance Li. The density of the ultralight magnesium-lithium alloy is 1.4-1.62g / cm<3>. The components are subjected to vacuum melting to obtain a casting ingot, the casting ingot is gradually squeezed through a die to be a bar with the diameter Phi being9.5mm, high-speed continuous production is achieved, the wire fracture phenomenon is avoided in the pulling process, the oxide inclusion content is reduced, the strength and plasticity of the alloy are improved, and the requirement for high-speed automatic welding of the welding wire can be met. A direct current argon arc welding machine is adopted for one-face forming welding, a welding connectorformed after the welding wire and base metal are welded is placed into an XL-1 medium-temperature box type resistance furnace for heat preservation for 20h at the temperature of 170 DEG C for artificial aging treatment, and the strength of the welding connector is improved. Compared with the base metal, the tensile strength and the elongation percentage are improved, and welding performance is stable.

The invention relates to the technical field of seam welding machines, and specifically to a portable roof seam welding machine, which includes an independent power supply car and a welding machine. The welding machine is connected to the power supply car through lines. The welding machine includes a base and an electrode fixed on the base. assembly, adjustment mechanism and control device. The roof panel is located between the first electrode pressing wheel of the first electrode assembly and the second electrode pressing wheel of the second electrode assembly of the welding machine. After the welding machine is connected to the power supply vehicle through lines and energized, so that The first electrode pressing wheel and the second motor pressing wheel can weld the roof panel, with a high degree of welding automation, increased welding efficiency and stable welding performance.

The invention discloses a low-carbon equivalent high-strength hot-rolled seamless pipeline tube and a manufacturing method thereof. The low-carbon equivalent high-strength hot-rolled seamless pipeline tube comprises the following components in percentage by weight: 0.08-0.2 percent of C, 0.1-0.45 percent of Si, 0.8-1.6 percent of Mn, less than 0.02% percent of P, less than 0.005 percent of S, not more than 0.5 percent of Cr, not more than 0.5 percent of Ni, not more than 0.5 percent of Cu, not more than 0.05 percent of Mo, not more than 0.01 percent of O, less than 0.15 percent of (Nb+V+Ti), 0.05-0.1 percent of V, not more than 0.05 percent of Nb, not more than 0.04 percent of Ti, 0.38-0.45 percent of Ceq, N% being not less than (V% / 8.6+Ti% / 3.4) and not more than (V% / 3.6+Nb% / 6.6+Ti% / 3.4), and the balance of Fe and unavailable impurities. The seamless pipeline tube disclosed by the invention is low in carbon equivalent (limited below 0.45), also as high as X60 steel grade or higher in strength (the yield strength is as high as 60Ksi / 415MPa or higher), excellent in impact toughness (the full-size charpy V type impact absorbing energy Ak is larger than 100J at 0 DEG C,), also free from quenched-tempered heat treatment, and deliverable in a hot-rolled / normalization state, so that the cost of a pipeline is lowered, and the pipeline tube is applicable to the fields of conveying tubes and structural tubes for oil gas and other fluids, etc.

The invention discloses a combined electrode structure of space solar cell array conductor resistance welding. The combined electrode structure comprises a positive electrode pressing welding part, anegative electrode pressing welding part and a negative electrode clamping base plate, wherein the positive electrode pressing welding part, the negative electrode pressing welding part and the negative electrode clamping base plate are combined to use during welding; during welding, the positive electrode pressing welding part and the negative electrode pressing welding part are connected with awelding machine electrode arm, and the positive electrode pressing welding part and the negative electrode pressing welding part are located on the same side of a welded object; the negative electrodeclamping base plate is located on the other side of the welded object; the welding machine electrode arm carries out pressing welding on a single side through the positive electrode pressing weldingpart and the negative electrode pressing welding part; welding current is outputted from the power supply of a welding machine and is flown into from the positive electrode pressing welding part via an upper lead on the welding arm, flows through each welded surface of a welded piece and the negative electrode clamping base plate and is flown out from the negative electrode pressing welding part;and the positive electrode pressing welding part and the negative electrode pressing welding part are made of pure molybdenum materials and the negative electrode clamping base plate is made of a brass material. The combined electrode structure is stable in welding performance and reliable in welding point, and the welding process is convenience in implementation and efficient.

The invention discloses a normalizing DH36 steel plate for wind power and a preparation method thereof. Weigh each component as required to get molten iron, molten iron KR mechanical stirring desulfurization, converter oxygen blowing smelting, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, slab reheating, rough rolling, intermediate slab Waiting for warm cooling, finishing rolling, accelerated cooling, off-line stack cooling, ultrasonic flaw detection, shot blasting, normalizing, accelerated cooling of steel plates, fire cutting, storage. In the slab reheating stage, the heating temperature is controlled at 1150-1250°C, and the time in the furnace is not less than 1.0min / mm; the rough rolling temperature is controlled at 1000-1100°C, and the final rolling temperature is 860-900°C; the normalizing temperature of the steel plate is 880 ~900°C, the normalizing time in the furnace is not less than 2.0min / mm, and the cooling temperature after normalizing is 540‑600°C. The steel plate of the invention has good performance, low production cost, thick applicable thickness and good application prospect.

The invention relates to a multilayer interconnected electronic circuit board, which comprises a main board and one or more jumper boards, wherein each jumper board is a double-sided board, the area of each jumper board is smaller than that of the main board, one surface of each jumper board is provided with a jumper circuit, the other surface of the jumper circuit is provided with a plurality ofbutt-joint bonding pads, via holes are formed in the butt-joint bonding pads, the butt-joint bonding pads are communicated with the jumper circuits through the via holes, the main board is provided with a plurality of bonding pads corresponding to the butt-joint bonding pads, and the butt-joint bonding pads are connected with the bonding pads in a one-to-one correspondence manner. According to themultilayer interconnected electronic circuit board, the material utilization rate is high, and the cost can be effectively reduced.

The invention provides an ultralow-hydrogen high-tenacity welding rod for a low-temperature spherical tank. The ultralow-hydrogen high-tenacity welding rod comprises a steel core and a cover. The cover is composed of, by mass, 37%-44% of CaCO3, 20%-29% of CaF2, 6.0%-10% of TiO2, 4.0%-9.0% of SiO2, 5.0%-8.0% of Si-Fe, 4.0%-6.0% of Mn, 0.7%-1.2% of Mo, 1.0%-3.0% of Mg, 2.0%-4.0% of Ni, 1.0%-1.5% of CMC, 0.5%-1.0% of seaweed, 2.0%-4.0% of light rare earth oxide, 0.6%-1.0% of lithium carbonate, 0.5%-1.0% of graphite, and the balance iron powder. The ultralow-hydrogen high-tenacity welding rod for the low-temperature spherical tank is small in welding spattering, attractive in appearance, capable of achieving slag removal easily, high in deposition rate, excellent in welding performance, stable in electric arc, free of arc bias, and high in impact toughness at the lower temperature of minus 50 DEG C; the diffusible hydrogen [H] content of deposited metal is lower than 4 mL per 100 g, and the index requirement of ultralow hydrogen is met; and the materials of the welding rod are easy to purchase, and the welding rod is low in production cost, wide in application range and convenient to use.

The invention discloses sintered flux for efficient submerged arc welding and a production technology of the sintered flux. The sintered flux comprises front face flux and reverse face flux, the front face flux is composed of Al2O3, CaO, CaF2, MgO, SiO2, TiO2, B2O3, Fe powder and silicon calcium alloy, and the reverse face flux is composed of Al2O3, CaF2, MgO, MnO, SiO2, TiO2, Fe2O3 and silicon calcium alloy. The technology comprises the steps that batching is performed on raw materials according to ingredients of the sintered flux, the raw materials are put into a blender for even blending, a mixed material is obtained, bonding agents are added in the mixed material for granulation, low-temperature drying is performed at the temperature of 200 DEG C to 300 DEG C, after screening, sintering is performed, screening is performed again, and the product sintered flux is obtained. The sintered flux can meet the technological requirement of the good single face for being welded into double faces, the reverse face welding way is stably formed, and the sintered flux is suitable for high-speed welding, has the good mechanical performance and meets the 3Y standard required by classification societies of various countries.

The invention discloses a method for producing a tungsten-yttrium electrode, which comprises: a. yttrium nitrate water solution is evenly mixed with a solid material containing ammonium paratungstate(APT) or tungsten trioxide(WO3) in the mode of spray mixing, and heated and dried to prepare tungsten-yttrium coating powder; b. the prepared tungsten-yttrium coating powder is reduced twice to obtaintungsten-yttrium powder, and the tungsten-yttrium powder is pressed and sintered to obtain a tungsten-yttrium cored bar; and c. by adopting the pressure processing forging method, the prepared tungsten-yttrium cored bar is made into the tungsten-yttrium electrode. In the method, the yttrium nitrate water solution is evenly mixed with the solid material containing the ammonium paratungstate(APT) or the tungsten trioxide(WO3) in the mode of spray mixing; due to the spraying mode, the yttrium nitrate water solution coats the surface of the ammonium paratungstate(APT) or the tungsten trioxide(WO3), so the mixing, stirring and drying of the yttrium nitrate water solution and the solid material are completed together, thereby achieving the aim of preparing the even tungsten-yttrium coating powder, improving the production capability, making the coating powder more even and effectively improving the performance of the tungsten-yttrium electrode in welding.