1358 results about "Slag (welding)" patented technology

The invention relates to a process for producing an ultra-thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model casting manufacturing blank and an electro-slag remelting manufacturing blank. The method comprises the following steps: cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-surface oxide layer of a casting blank with a milling machine, a planer or a shot blast); clamping an assembly (relatively superposing the cleaning surfaces of the two blanks after processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a vacuum chamber of an electronic beam welding machine for purpose of vacuuming; sewing the assembly on the electronic beam welding seal edge, heating the assembly in a furnace and rolling the assembly through temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-slag remelting production process, the process has the advantages of high production efficiency, reduced electric power consumption, less investment of production devices and low production cost. Compared with the traditional die casting production process, the process solves the problem of segregation and looseness of a large-scale die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.

The invention relates to a method for melting a nickel-base high temperature alloy with an electro-slag furnace. The method includes the following methods: loading materials, welding a high temperature alloy electrode and a false electrode to be smelted together, and placing slag materials at the bottom of a crystallizer; blowing the welded electrodes with inert gases, and closing a protection cover; protecting a smelting closing smoke exhaust valve, and feeding an Ar gas into the crystallizer and the protection cover; striking an arc and melting slag; cleaning smelting slag materials, starting a smelting period, and swinging a slag resistor for less than 0.5 m omega during the smelting process; adding oxidizing agents, and adding metal aluminum powder continuously or at intervals to serve as deoxidizing agents during an electro-slag re-melting process; adopting feeding thorough three stages, power feeding is decreased rapidly, power feeding is decreased slowly, and finally heat is preserved at constant power; and casting a die, cooling and demolding the die. According to the method for melting the nickel-base high temperature alloy with the electro-slag furnace, the surface of a nickel-base high temperature steel ingot has no slag groove defect, and the burning losses of Al and Ti are less than or equal to 5%.

The invention provides a micro alloying SWRH87B hot rolled wire rod and a manufacturing method thereof, belonging to the technical field of hot rolled wire rod. In the invention, Cr and V micro alloying are adopted; double slag process high drawing carbon operation is used in a converter; end-point carbon is controlled at 0.40-0.60%, the steel tapping temperature is 1580-1620 DEG C, and the slag-blocked tapping is used; low nitrogen carburant is used for recarburization; Si-Ca-Ba is used for deoxidation; 600-800kg synthetic slag is added into each converter; oxygen activity is controlled below 10ppm by entering into an LF refining station, and the refined finishing slag sum of FeO and MnO is no more than 3%; inclusion modification treatment is carried out on the Ca-Si line; a billet in the size of 160mm*160mm is used, a casting mould is used for coordinating with final electromagnetic stirring (F-EMS); continuous casting machine whole protection, constant drawing speed casting and proper secondary cooling system are adopted; the initial rolling temperature is controlled at 1020-1150 DEG C which is conductive to welding the drawholes and increasing the probability of the drawholes welding; the water pre-cooling and phase transformation strengthening cooling technology is used to control the texture and the performance. The invention has the advantages that the aging time of the wire rod before the follow-up processing is shortened, the tensile strength thereof after aging time is larger than 1280MPa, and the area reduction rate is larger than 25%.

The invention discloses a surfacing electrode for repairing a hot forged mould, which uses a low-carbon steel H08A core wire conforming to the GB/T3429 requirement. The solid component quality content of coating is as follows: 30-40% of marble, 12-20% of fluorite, 1.5-3% of zircon sand, 0-2% of soda ash, 2-5% of silicon epitaxy material, 1-3% of titanium white, 0-3% of flogopite, 1-2% of rare earth fluoride, 3-7% of manganese metal, 2-5% of ferrosilicon, 4-6% of ferrotitanium, 4-8% of chromium metal, 4-8% of ferromolybdenum, 6-12% of metallic nickel and 1-2% of aluminium magnesium alloy. The invention has favorable welding rod performance, smooth welding rod surface, high yield and stable eccentricity; electric arc is easy to ignite and is stable to burn; coating is even to melt, a welding line is attractive in shape, and slag is easy to clean; and a deposition metal weld metal buildup has moderate welding state hardness which reaches the requirements of the hot forged mould, thus improving the service life cycle of the hot forged mould.

The invention belongs to the technical field of a welding material and particularly relates to a carbon steel covered electrode for the third-generation nuclear power technical welding and a preparation method. The carbon steel covered electrode is characterized by comprising a core wire, a cover and an adhesive, wherein the mass ratio of powder to the covered electrode is (25 to 27):100 and the mass ratio of the powder to the adhesive is 100:(15 to 20). In the welding process of the covered electrode in the invention, electric arcs are stable and splashing is little; slag detachability is good; a postwelding slag crust in the flat welding process can be automatically upwarped; the covered electrode is well formed and has good whole-position operability; after welded deposited metal is subjected to heat preservation for 1h, 16h and 40h at a temperature of 595 to 625 DEG C, mechanical property in the three thermal treatment states meets the technical indexes and has high stability.

The invention relates to a low-temperature halogen-free lead-free solder paste. The solder paste is mixed by Sn-Ag-Bi-based lead-free solder powder added with P or rare earth elements and a rosin-based soldering flux. The soldering flux is basically composed of, by weight, 30-45% of rosin resin, 2-10% of an organic acid activator, 3-5% of a thixotropic agent, 2-5% of a corrosion inhibitor, 3-5% of a surfactant and the balance solvents. The solder paste has the advantages that the welding temperature is low, slag is reduced, and the solder paste is suitable for manual welding and printing welding with poor thermal shock resistance.

The invention discloses a high-hardness self-protecting cold roll build-up welding flux-cored wire, and belongs to the field of welding in material processing. The flux-cored wire is mainly applied to build-up welding repair of cold rolls of steel mills. The flux-cored wire is characterized in that: the outer surface of the powder cored wire is an H08A cold rolling steel strip; and the powder of the powder cored wire comprises the following components in percentage by mass: 25 to 45 percent of high carbon ferrochrome, 5 to 15 percent of chromium metal, 4 to 8 percent of ferromolybdenum, 5 to 10 percent of manganese metal, 4 to 8 percent of No.75 silicon iron, 4 to 10 percent of aluminum magnesium alloy, 6 to 12 percent of ferrocolumbium, 4 to 10 percent of ferrotungsten, 4 to 12 percent of nickel powder and 4 to 18 percent of iron powder. A coating prepared by build-up welding has high hardness (Rockwell hardness (HRC): 55 to 60) and excellent abrasion resistance; and a self-protecting build-up welding mode is adopted, namely a protective gas source and a flux are not needed in the build-up welding process, and slag knocking is not needed in the build-up welding process, so automatic production is easy to realize.

The invention relates to a flux-cored wire for the visible arc overlaying of high-chromium cast iron. According to the flux-cored wire, a flux core comprises the following components in percentage by mass: 40 to 60 percent of high-carbon ferrochromium, 1 to 6 percent of graphite, 4 to 8 percent of electrolytic manganese, 2 to 6 percent of low ferrosilicon, 10 to 30 percent of metal chromium, 8 to 15 percent of aluminum magnesium alloy and 10 to 20 percent of other alloys. When the flux-cored wire is used for welding, a dilution rate is low, an electric arc is stable, a weld joint does not have slag and has ultrahigh hardness and corrosion resistance, and the overlaying can be performed directly without addition of soldering fluxes and protective gas, so that the construction cost is reduced, and the inconvenience of the operation is reduced.

The invention relates to a production process of steel, in particular to a smelting process of steel for a high-titanium alloy welding wire. The smelting process comprises the following steps of: in an electric furnace smelting step, adding molten iron and waste steel and tapping molten steel, wherein the molten iron accounts for 50-60% the total amount of the furnace charge, and the tapping temperature is not lower than 1630 DEG C; in a refining furnace refining step, adding silicon-aluminum-calcium deoxidant in a refining furnace for manufacturing white slag through diffusion deoxidization, and adding low-carbon ferromanganese and ferrosilicon according to steel grade component requirements and sampling component analysis to regulate components of the molten steel so as to reach temperature of 1630-1650 DEG C matching vacuum treatment; in a vacuum furnace degassing step, keeping the temperature for 10-15min under a low vacuum degree of 1 millibar, and carrying out secondary refining after vacuum breakage; and in a secondary refining step, adding low-aluminum ferrotitanium to regulate titanium content at the refining temperature of 1585-1600 DEG C, stirring for 1-2min, adding iron sulfide, stirring for 1-2min, taking a lollipop sample to analyze, continuously keeping static stirring, carrying out soft argon blowing for 15-40min after all components are qualified and carrying out continuous casting when the temperature is up to 1565-1585 DEG C. The smelting process disclosed by the invention can effectively control purification degree of the molten steel, ensures stability of titanium in the molten steel and improves the surface quality of a cast blank.

The invention discloses a method for welding a box-shaped column, which comprises a process for welding the box-shaped column and a method for welding a weld joint between a partition plate and a wing plate by electric slag welding. The box-shaped column comprises a web plate, the wing plate and the partition plate. The weld joint between the partition plate and the wing plate of the box-shaped column is welded by the electric slag welding method, and the overall welding process of the box-shaped column is analyzed and optimized based on the method. Thus, the process route is simple and accurate; and the method has the advantages of reducing manufacturing difficulty, improving processing precision, improving production efficiency and improving the quality of members.

The invention discloses a two-phase stainless steel electrode, which comprises a core wire and a coating, wherein the coating is coated on the outer wall of the core wire and accounts for 0.4 to 0.5 percent of the total weight of the electrode. The core wire comprises the following components in percentage by weight: 0.005 to 0.030 percent of C, 0.01 to 0.20 percent of Si, 1.50 to 2.50 percent ofMn, 0 to 0.025 percent of P, 19.0 to 22.0 percent of Cr, 9.0 to 11.0 percent of Ni, 2.5 to 3.5 percent of Mo and the balance of Fe. The coating comprises the following components in percentage by weight: 8 to 20 percent of calcium carbonate, 2 to 15 percent of barium carbonate, 5 to 15 percent of calcium fluoride, 6 to 17 percent of strontium fluoride, 4 to 16 percent of barium fluoride, 9 to 18 percent of cryolite, 4 to 10 percent of rutile, 1 to 5 percent of titanium white, 2 to 8 percent of silicon dioxide, 3 to 9 percent of chromium powder, 1 to 1.5 percent of molybdenum powder, 0.1 to 4 percent of magnesium powder and 5 to 13 percent of iron powder. After the coating components are uniformly mixed, an adhesion agent is added into the mixture. The two-phase stainless steel electrode has high strength, high tenacity and intercrystalline corrosion resistance; and during welding, an electric arc is stable, splashing phenomena is reduced, a welding seam is well molded, slag is easy toremove, and the electrode has high operability.

A gas shielded flux-cored wire (FCW) comprises s steel sheath and core flux, in which recycled welding slag powder is used to partially replace the natural rutile. The core flux contains (by weight): 10-50% recycling welding slag powder, 10-45% TiO₂, 2-7% Si, 5-20% Mn, 0.5-5% Al—Mg (Al/Mg=1), 0-11.52% Na₂CO₃, 0-8.85% K₂CO₃, 0-10% MgO, 0.5-10% fluoride, and iron powder as balance. The recycling welding contains (by weight): TiO₂: 20-65%, MnO: 5%-15%, MgO: 5%-15%, SiO₂: 5%-15%, Fe₂O₃: 1%-10%, Al₂O₃: 1%-10%.

The invention discloses a flux-cored wire having high abrasion resistance and application thereof and belongs to the field of welding materials. The flux-cored wire comprises a skin and a flux core. The flux core comprises, by mass, 4.9-5.0% of tungsten carbide, 2.0-2.1% of boron powder, 1.9-2.1% of vanadium powder, 8-10% of manganese powder, 30-35% of chromium powder, 1-2% of niobium powder, 0.5-1% of cerium oxide, 0.8-1.3% of lanthanum oxide, yttrium oxide, 4.0-4.5% of quartz, 2.0-3.5% of magnesite, 3.5-4.0% of fluoride, and the balance rutile and carbon powder, wherein the total content of C in the flux core is 6.0-6.5%. The flux-cored wire has the advantages that the flux-cored wire splashes little, is good in stability, has easiness in deslagging and is good in abrasion resistance and toughness and slag is covered evenly. The flux-cored wire is particularly high in impact resistance and suitable for cutter welding having high requirements for abrasion resistance and toughness.

The invention discloses a high-strength aluminum alloy material applicable to a motorcycle rim, which is characterized by comprising the following elements in mass percentage: not more than 0.15% of silicon, not more than 0.20% of ferrum, 0.40-1.4% of copper, 1.1-1.6% of magnesium, 0.10-0.30% of manganese, 5.6-6.8% of zinc, 0.02-0.08% of titanium, 0.10-0.30% of chromium, 0.05-0.20% of zirconium, and the balance of aluminum. The production process of the aluminum alloy material comprises the following steps of blending materials, charging, removing slag, adding magnesium, stirring, sampling, adjusting components, refining, removing slag, refining, keeping standing and casting. The high-strength aluminum alloy material has the advantages of high strength, good elongation percentage, good welding performance and good chemical polishing performance.

The invention discloses a hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode which consists of a core welding wire and a coating, wherein the coating is coated on the outer wall of the core welding wire, the weight coefficient of the coating accounting for the total weight of the welding electrode is 0.4-0.5, the core welding wire comprises the following constituents in percentage by weight: 0.01-0.08% of C, 0.01-0.05% of Si, 0.30-0.55% of Mn, 0.005-0.20% of Cr, 0.005-0.20% of Ni, 0.001-0.006% of P, 0.001-0.005% of S and the balance of Fe; the coating adopts a basic slag system which comprises the following constituents: 30-50% of calcium carbonate, 1-2% of sodium carbonate, 15-30% of calcium fluoride, 3-8% of rutile, 1-5% of titanium pigment, 2-10% of silicon dioxide, 5-10% of electrolytic manganese, 2-5% of ferrosilicon and 0.1-1.5% of ferromolybdenum. When the welding electrode is adopted to weld, the tensile strength of a welding line is more than 500MPa, the striking energy is more than 170J at minus 30 DEG C, the content of diffusible hydrogen is between 2-3ml/100g and the crack sensitivity is less than 0.11, and the hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode is used for welding of essential equipment in petrochemical industry and the like.

The invention discloses exothermic welding powder for welding novel grounding grid materials. The exothermic welding powder comprises, by weight, 45%-60% of copper oxide, 8%-13% of aluminum powder, 20%-30% of copper powder, 5%-15% of copper-phosphorus alloy powder, 1%-5% of tin powder, 2%-6% of fluorite powder, 1%-4% of borax powder and the balance alloy powder. The alloy powder comprises, by weight, 8%-12% of Ca, 40%-47% of Si, 28%-32% of Ba and the balance impurities. According to the exothermic welding powder, raw materials are low in price and easy to get, the problems that pores, slag inclusion, hot tear and the like can be easily generated in the welding process by using the exothermic welding powder are solved, the quality of welded joints is reliable, the connecting cost of the novel grounding grid materials is lowered, and the development of a grounding system in electric power engineering in China is facilitated.

The invention discloses a welding machine for a box beam. The welding machine mainly comprises a trolley part, a column mechanism, a lifting mechanism and a cantilever part, wherein the column mechanism is mounted at the trolley part; the lifting mechanism is mounted at the top end of a column; the cantilever part is mounted on one side of the column; and a crawling ladder and a line hanging device are arranged further. According to the welding machine, corresponding structural parts are reasonably combined, actions such as trolley walking, column rotation, platform lifting, machine head walking and the like can be realized, and two welding techniques of electro-slag welding and submerged-arc welding can be completed on one welding machine. According to the welding machine for the box beam, two machine heads can be adjusted right and left, up and down and front and back, the flatness of a weld joint can be guaranteed, the welding quality is improved, and the cost is lower.