40results about How to "Less welding fumes" patented technology

A low-dust crack-resistant full-position flux-cored wire is characterized in that the medicinal powder used by the flux-cored wire is composed of chemical components according to following percentage by weight: 25% of TiO2, 2% of SiO2, 1% of ZrO2, 1% of fluoride, 0.5% of Si, 8% of Mn, 1% of Al, 3% of Mg, 0.3% of Ti, 0.1% of boride, 0.1% of Re, 0.1% of Na2O, 0.1% of K2O, residue percent is iron powder; the preparing method comprises following steps: steel band longitudinal shearing, edge preprocessing, rolling, wire drawing, and winding. The advantages of the invention are: the weld dust is reduced, and the crack resistant property of welding joint is increased; the welding wire is provided with stable welding arc, little splash, good all position welding performance, good-looking weld joint, excellent detachability and good mechanical performance.

A gas-shielded flux-cored wire with recyclable welding slag belongs to the welding field. In the invention, the skin of the gas-shielded flux-cored wire is made from a mild steel strip, and welding slag powder is partially or completely instead of natural rutile, thus the purposes of saving the resource and reducing the cost are achieved. The powder of the flux-cored wire comprises the following chemical components in percentage by weight: 15-35% of the welding slag powder of the flux-cored wire (including 20-65% of TiO2, 5-15% of MnO, 5-15% of MgO, 5-15% of SiO2, 1-10% of Fe2O3 and 1-10% of Al2O3), 15-35% of TiO2, 2-7% of Si, 3-8% of Mn, 0.5-5% of Al-Mg, 0-5% of Na, 0-5% of K, 1-5% of Mg and the balance of ferrous powder. When the flux-cored wire manufactured by adopting the welding slag powder is applied to welding, the gas-shielded flux-cored wire has the advantages of excellent technical performance of welding and omnibearing welding adaptability, attractive appearance good humidity resistance, low content of diffusible hydrogen in a welding seam, excellent crack resistance, high connection strength and good low-temperature impact toughness.

The invention discloses a submerged-arc welding flux-cored wire. The submerged-arc welding flux-cored wire is characterized in that flux core powder comprises the following components in percentage by weight: 10 to 32 percent of rutile, 5 to 15 percent of silicon-manganese alloy, 10 to 45 percent of iron powder, 2 to 15 percent of nickel powder, 10 to 40 percent of chromium metal, 2 to 15 percent of aluminum magnesium alloy and 5 to 15 percent of micro-carbon ferro chrome. The submerged-arc welding flux-cored wire has the advantages that the submerged-arc welding flux-cored wire is resistant to wear and corrosion and is suitable for overlaying of continuous rollers and welding of components of gas turbines and blades of centrifugal pumps.

The invention relates to a welding electrode coating. The coating is prepared from the following raw materials by weight: 1kg of marble, 2kg of titanium white, 14.78kg of reduced titanium, 1kg of cellulose, 4 kg of rutile, 3kg of coarse mica, 2kg of fine mica, 3kg of white mud, 2.4 kg of feldspar, and 15.12kg of medium manganese; the coating is prepared by uniformly mixing the raw materials of the coating; and when used for a welding electrode, the coating is pressed and coated on a core wire by taking 38 to 40 DEG C sodium silicate as a binder. The welding electrode coating has the advantages that: 1, slag can be removed easily, and can be completely removed at the positions of a T-type joint fillet weld, butt fillet weld, fillet weld, and the like, and the slag at the downward welding and flat fillet weld positions can be warped automatically, the whole strip falls off, and the slag is not stuck to the edge and the weld surface; 2, there is hardly splashing; 3, arc restarting performance is high, and the time interval limitation is avoided; 4, all position welding can be achieved; 5, the welding seam is fine and bright, and the color of the weld seam is silvery white or golden yellow; and 6, smoke of welding is less and safety and nontoxicity are guaranteed.

The invention discloses a flux-cored wire for additive manufacturing. The wire comprises a flux core and sheet steel. The flux core is composed of, by mass percent, 2.00%-3.83% of ferromanganese powder, 16.95%-20.85% of nickel powder, 8.35%-11.65% of chromium powder, 1.05%-3.00% of molybdenum powder, 0.90%-1.62% of ferrovanadium powder, 0.05%-0.10% of boron powder, 2.16%-10.82% of ferrotitanium powder, 0.5%-1.5% of ferrosilicon powder, 0.50%-1.00% of aluminum-magnesium powder, 0.80%-1.00% of rare earth elements and the balance being iron powder, wherein the sum of the mass percents of the components is 100%. The flux-cored wire is a wire used for arc additive manufacturing of low-alloy steel applied to a fan impeller. The invention further discloses a preparation method of low-alloy high-strength steel. The flux-cored wire has excellent comprehensive mechanical properties; and by the adoption of an additive manufacturing mode, the low-alloy high-strength steel can meet the requirementon the mechanical properties and is efficient and convenient to use.

The invention discloses a carbon dioxide gas shielded welding flux-cored wire, which is characterized in that the flux-cored powder of the wire is mixed by the following components in percentage by weight: 10-30% of rutile, 10-30% of silicomanganese, 15-40% of iron powder, 2-15% of nickel powder, 2-25% of chromium metal, 1-5% of aluminium magnesium alloy, 2-10% of ferromolybdenum and 2-10% of ferrovanadium. The carbon dioxide gas shielded welding flux-cored wire disclosed by the invention has the advantages that the hardness and the non-deforming performance of a hot mill guide plate, a hot-forging die, a valve and the like are still can be kept even if the hot mill guide plate, the hot-forging die, the valve and the like work under the high-temperature impact load for a long time.

The invention discloses a s elf-shielded flux-cored wire for non-magnetic steel 20Mn23Al. The wire comprises a flux core and a skin; the flux core is composed of 18 to 28% of chromium powder, 2 to 8% of nickel powder, 1.5 to 3.5% of molybdenum powder, 2.5 to 10% of manganese powder, 0.5 to 1.5% of ferrosilicon powder, 2 to 8% of aluminum and magnesium, 0.5 to 1.5% of ferrocolumbium, 0.5 to 1% of ferrotitanium, 10 to 17% of barium fluoride, 5 to 15% of magnesium oxide, 1 to 5% of aluminum oxide, 0.5 to 1.5% of cerium oxide, 1 to 3.5% of quartz sand, 18 to 26% of rutile, 2 to 8% of zircon sand, 1 to 3% of lithium carbonate, 0.5 to 3% of calcium carbonate and 0.5 to 5% of iron oxide powder. The wire is used for 20Mn23Al welding, protection gas does not need to be added, a welding joint with higher tensile strength and corrosion resistance can be obtained, the welding wire is simple in preparing method, and large-scale batched production is facilitated.

The invention discloses a stainless steel flux cored wire protected by CO2 gas. The stainless steel flux cored wire protected by CO2 gas is characterized in that flux cored powder and a steel belt wrapping the flux cored powder are included, and the flux cored powder of the flux cored wire comprises, by weight, 15-35% of rutile, 12-25% of silicon manganese alloy, 12-30% of iron powder, 5-16% of nickel powder, 3-10% of aluminium magnesium alloy, 10-25% of micro-carbon ferro chrome, 5-15% of ferro-molybdenum and 5-15% of ferrovanadium. The stainless steel flux cored wire protected by CO2 gas has the advantages of being suitable for welding on small-specification ultrathin stainless steel devices and containers.

The invention discloses a locomotive-buffer-bar surface repairing and remanufacturing method. The locomotive-buffer-bar surface repairing and remanufacturing method includes the following steps that S1, repairable to-be-repaired buffer bars are screened out; S2, the abrasion loss of the to-be-repaired buffer bars is checked, to-be-repaired areas are determined on different-radius shaft segments ofthe buffer bars according to the size of the abrasion loss respectively, and to-be-repaired grooves are processed in the to-be-repaired areas; S3, the to-be-repaired buffer bars are sequentially subjected to sand blasting, cleaned and preheated; S4, one ends of the to-be-repaired buffer bars are fixed on a displacement device, and the to-be-repaired grooves are subjected to continuous annular welding through a CMT automatic welding system to complete repairing of the to-be-repaired buffer bars; S5, the repaired buffer bars obtained in the step S4 are welded to be subjected to slow cooling treatment; S6, the repaired areas of the repaired buffer bars are machined according to the size of an original-buffer-bar drawing, and then whole sand blasting is carried out. The locomotive-buffer-barsurface repairing and remanufacturing method is low in cost, high in efficiency and high in repairing quality, and the buffer bars after being repaired and remanufactured with the method can reach thequality standard of a new buffer bar.

The invention discloses a laser-InFocus electric arc double-face symmetric composite welding method, and relates to welding methods. The method comprises the steps of firstly, machining and grinding or cleaning a workpiece to be welded; secondly, adjusting the position of an InFocus welding gun and the position of a laser head; thirdly, setting welding parameters, wherein the diameter of light spots ranges from 0.1 mm to 0.5 mm, the defocusing amount ranges from -3mm to 3 mm, the laser power ranges from 500 W to 5000 W, the electric arc current of the InFocus welding gun ranges from 50 A to 1000 A, the welding speed ranges from 50 mm / min to 900 mm / min, Ar gas protection is carried out, the gas flow ranges from 10 L / min to 30 L / min, and the InFocus protection gas flow ranges from 10 L / min to 25 L / min; and fourthly, carrying out composite welding. The InFocus welding gun and a TIG welding machine are matched well, a dedicated power source is not needed, the equipment cost is reduced, the welding gun is reliable and durable, the interchangeability of the consumable is good, and due to the design of the InFocus welding gun, mechanization and automation are easily achieved.

The invention discloses a gas shielded flux-cored welding wire for vertical mill grinding roller bead welding composite manufacture and a preparation method thereof. The welding wire is composed of aferrite stainless steel band and powder wrapped in the ferrite stainless steel band, wherein the powder accounts for 25-28% of the total weight of the welding wire. The powder comprises, by weight, 60.0-65.0% of high carbon ferro-chrome, 12.0-15.0% of chromium carbide, 5.8-6.0% of graphite, 1.0-2.0% of metal manganese powder, 4.0-4.5% of carbonizing silica powder, 1.0-2.0% of aluminum magnesium alloy, 0.2-0.5% of zircon sand, 0.5-1.5 of cryolite, 0.5-1.5% of sodium fluoride, 0.5-1.5% of lithium carbonate, and the balance iron powder. The preparation method comprises the following steps of manufacturing the ferrite stainless steel band with the thickness of 0.4 mm and the width of 10 mm into a U shape; adding the powder into the U-shaped groove; after the U-shaped groove heals up, conducting six times of continuous drawing reducing in sequence; finally conducting mechanical cleaning on the surface of the welding wire; and obtaining the phi 1.2mm gas shielded flux-cored welding wire forgrinding roller bead welding composite manufacture. The vertical mill grinding roller bead welding composite manufacture can be achieved by adopting the welding wire, the welding processing performance of the welding wire is excellent, little welding smoke is produced, the operation is flexible, and a bead welding layer is high in abrasive resistance.

The invention relates to the field of welding wire manufacturing, in particular to a preparation method of an aluminum and aluminum alloy welding wire electrochemically plated with a Zn+Cu / Re composite coating and applied to robot welding. A pure aluminum or aluminum alloy wire rod is used as the matrix. Pretreatment, electrochemical plating of the Zn+Cu / Re composite coating and post-treatment areconducted on the surface. The electrochemically plated Zn+Cu / Re composite coating has the functions of reducing welding smoke, improving the porosity resistance of the welding wire and improving solid lubrication and meanwhile fills up pits in the surface of the welding wire matrix, and the electric conductivity and surface quality of the welding wire are improved; the bonding force and strengthof the Zn+Cu / Re composite coating are high, the aluminum or copper peeling phenomenon is avoided, the Zn+Cu / Re composite coating is high in compactness, good in rust resistance and resistant to wear,Zn can reduce welding smoke and splashes, and Re can refine plating layer crystals and reduce the void ratio; and meanwhile, molten bath stirring is enhanced, a molten bath is purified, crystals are refined, pores on the surface and on the inner portion of a welding joint are thoroughly eradicated, and the porosity resistance of the welding wire is improved.

The invention provides a high-performance rutile carbon steel welding rod. The welding rod comprises a welding core and a cover; and the cover comprises the following components in parts by weight: 45-55 parts of rutile, 10-25 parts of quartz, 10-20 parts of marble, 5-15 parts of medium-carbon ferromanganese, 5-15 parts of kaolin, 2-12 parts of microcrystalline cellulose, 2-8 parts of starch, and1-5 parts of titanium dioxide. In the high-performance rutile carbon steel welding rod and a preparation method thereof, the welding rod achieves excellent comprehensive mechanical performances and reliable cracking resistance, the formation of a welding bead is improved, the welding splashing and the smoke harm are reduced, the generation process of the welding rod is simplified, the quality of the welding rod is stabilized, and high carbon steel welding requirements are met.

The invention discloses a niobium-strengthened wear-resisting surfacing electrode. The niobium-strengthened wear-resisting surfacing electrode comprises an electrode core and an electrode coating coated on the surface of the electrode core. By weight percentage, the electrode coating is composed of 30-50% of marble, 15-25% of fluorite, 4-10% of titanium dioxide, 3-8% of zircon sand, 3-8% of potash feldspar, 4-8% of rare earth silicon and 3-10% of ferroniobium. The invention also discloses a preparation method of the niobium-strengthened wear-resisting surfacing electrode. The niobium-strengthened wear-resisting surfacing electrode is strengthened through niobium and prepared through market materials, can obviously improve the hardness and the wear resistance of surfacing layers and ensure high welding technological properties of welding electrodes, and meanwhile, is low in cost. The actual application results show that, during the surfacing process, the niobium-strengthened wear-resisting surfacing electrode is simple in arc striking and re-arcing, stable in arcing, less prone to arc interruption, high in blowing force, low in welding smoke, small in spatter granularity, high in fusing efficiency and easy to deslag; surfacing joints are fine in waviness, smooth in surface and free from cracking, undercut and the like.

The invention relates to a laser-arc hybrid welding solid wire for high-manganese austenite low-temperature steel and a welding process. According to the technical scheme, the laser-arc hybrid welding solid-core welding wire for the high-manganese austenite low-temperature steel comprises the following chemical components: 0.20-0.60 wt% of C; si is less than or equal to 0.05 wt%; the content of Mn is 20-32 wt%; the content of Ni is 0.1 to 2 weight percent; the content of Cr is 0.1 to 1.8 wt%; the content of Cu is 0.55 to 1.00 wt%; the content of W is 0.5 to 1.9 weight percent; the content of Mo is 1.3 to 3.0 wt%; the content of Al is 0.5 to 2 weight percent; the content of Nb + V + Ti + B + RE is 0-0.5 wt%; p < = 0.002 wt%; s < = 0.001 wt%; and the balance of Fe and inevitable impurities. The welding process is laser-arc hybrid welding. Full-automatic welding can be achieved, the welding efficiency is high, welding smoke is little, welding deformation is small, forming is good, and the mechanical property is excellent; a laser and electric arc hybrid welding process is adopted, so that the characteristics of good forming, small welding smoke dust, small welding deformation, high welding efficiency and high ultralow-temperature toughness are achieved, and the strength is matched with that of high-manganese austenite low-temperature steel.

The invention provides a low-dust and low-toxicity flux-cored welding wire. The low-dust and low-toxicity flux-cored welding wire comprises a sheet iron and a flux core. The flux core comprises, by mass percentage, 40-48% of rutile, 6-12% of quartz, 6-10% of magnetite, 4-6% of aluminum powder, 10-15% of ferrosilicon, 3-5% of ferrotitanium, 4-5% of nickel powder, 1-3% of marble and balance iron powder and inevitable impurities. The filling rate of the flux core in the flux-cored welding wire ranges from 14 to 16%. According to the low-dust and low-toxicity flux-cored welding wire, due to the fact that the flux core does not contain manganese and fluoride, the amount of dust generated in the flux-cored welding wire welding process is reduced remarkably, and welding fume does not contain harmful fluoride and almost no MnO. Meanwhile, argon-enriched shielding gas welding is adopted for the flux-cored welding wire, and according to the comprehensive performance of deposited metal and welding joints, the yield strength is larger than or equal to 470 MPa, the tensile strength is larger than or equal to 550 MPa, the elongation is larger than or equal to 22%, and Akv is larger than or equalto 47 J under the condition of minus 60 DEG C.

The invention discloses a vanadium-strengthened wear resistant surfacing electrode and a preparation method thereof. The vanadium-strengthened wear resistant surfacing electrode comprises a welding core and a coating which coats the surface of the welding core through adhesive, and the coating comprises 32-50% of marble, 15-25% of fluorite, 4-10% of titanium dioxide, 3-8% of zircon sand, 3-8% of potassium feldspar, 4-8% of rare earth silicon and 3-10% of ferrovanadium by weight. The vanadium-strengthened wear resistant surfacing electrode is strengthened by vanadium and made of raw materials sold on the market, the hardness and wear resistance of the metal of the surfacing layer can be obviously improved, the good welding technique performance of the electrode is guaranteed, and the cost is low; the application proves that arc striking and re-arcing are easy to perform when surfacing electrode, the electric arc is stable and difficult to break, and the blowing force is large; the welding fume is less, the splashing particle is small, and the deposition efficiency is high; the slag is removed easily, the weld ripples are fine and close, the surface is smooth, and crack, undercut and the like defects are avoided.

The invention discloses a rotating submerged-arc high-speed welding method for a thin plate. The method comprises the following steps that the assembled to-be-welded thin plate is pressed on a weldingbase plate in the welding direction, and welding flux and a welding wire matched with the to-be-welded thin plate are selected according to the material of the to-be-welded thin plate; according to the plate thickness and the groove form of the to-be-welded thin plate, the rotating submerged arc welding method and process parameters are set, finally, the welding flux is laid in the welding direction and the welding arc is ignited at the start welding position, a rotating submerged arc welding torch is controlled to drive the welding arc to rotate at a constant speed in the welding flux according to the set rotation speed and direction, and meanwhile, a dragging mechanism drives the rotating submerged arc welding torch to move to the front of welding overall, so that the rotating submergedarc high-speed welding of the thin plate is achieved. By adopting the rotating submerged-arc high-speed welding method for the thin plate, the implementation cost is low, the welding speed of the single welding wire arc can be remarkably increased, the welding assembly requirement is reduced, and the welding method is particularly suitable for a thin plate welding occasion.

The invention belongs to the field of welding materials, and particularly relates to a self-lubricating wear-resistant flux-cored wire containing a nickel-coated graphite component and a welding method thereof. The self-lubricating wear-resistant flux-cored wire containing the nickel-coated graphite component comprises a flux core and a carbon steel strip used for wrapping the flux core, wherein the flux core comprises the following components of, in percentage by mass, 18-22% of ferrochrome, 7-9% of ferroboron, 3-5% of ferrosilicon, 3-5% of ferromanganese, 0.4-0.6% of metallic aluminum, 2-3%of rare earth elements, 3-5% of nickel-coated graphite and the balance iron. According to the flux-cored wire containing the nickel-coated graphite powder, a hardfacing layer prepared through a double-constant-current-source molten-drop-free electric arc hot wire GTAW surfacing method has a self-lubricating function.

The invention discloses a laser-InFocus electric arc double-face symmetric composite welding method, and relates to welding methods. The method comprises the steps of firstly, machining and grinding or cleaning a workpiece to be welded; secondly, adjusting the position of an InFocus welding gun and the position of a laser head; thirdly, setting welding parameters, wherein the diameter of light spots ranges from 0.1 mm to 0.5 mm, the defocusing amount ranges from -3mm to 3 mm, the laser power ranges from 500 W to 5000 W, the electric arc current of the InFocus welding gun ranges from 50 A to 1000 A, the welding speed ranges from 50 mm / min to 900 mm / min, Ar gas protection is carried out, the gas flow ranges from 10 L / min to 30 L / min, and the InFocus protection gas flow ranges from 10 L / min to 25 L / min; and fourthly, carrying out composite welding. The InFocus welding gun and a TIG welding machine are matched well, a dedicated power source is not needed, the equipment cost is reduced, the welding gun is reliable and durable, the interchangeability of the consumable is good, and due to the design of the InFocus welding gun, mechanization and automation are easily achieved.

The invention discloses a titania-type flux-cored welding wire and a preparation method thereof. The preparation method comprises the following steps: filling welding fluid in a special low alloyed steel strip sheath, primarily rolling the special low alloyed steel strip sheath into a parison tube and pulling the parison tube under the action of a lubricant. The low alloyed steel strip sheath comprises the following ingredients in percentage by mass: 0.02-0.10 C, 0.5-0.9 Si, 1.2-1.7 Mn, 0-0.01 B, 0-0.2 Ti, Cr less than or equal to 0.1 percent, Ni less than or equal to 0.1 percent, S less thanor equal to 0.02 percent, P less than or equal to 0.02 percent, N less than or equal to 60 ppm and O less than or equal to 60 ppm, and the low alloyed steel strip sheath needs annealing dehydrogenation processing at 650-750 DEG C after being coldly rolled. The lubricant comprises the following ingredients: calcium-based unsaturated fatty acid substances or sodium-based unsaturated fatty acid substances, MoS2, WS2, titanium pigment, fluorinated resin and talcum powder. The invention decelerates the welding wire to deposit metal and diffuse hydrogen (mercury method) ([H] is smaller than 5ml / 100g) and improves the crack resistance on a bottom layer with a ceramic liner, and the welding wire has the advantages of stable welding arc and weak splashing.

A method for repairing and remanufacturing the surface of a buffer rod of a locomotive, the steps of which are as follows: S1, screening out repairable buffer rods to be repaired; S2, inspecting the wear amount of the buffer rod to be repaired, respectively in the shaft sections of the buffer rods with different radii, Determine the area to be repaired according to the size of the wear amount, and process the groove to be repaired in the area to be repaired; S3, perform sandblasting, cleaning and preheating treatment on the buffer bar to be repaired in sequence; S4, fix one end of the buffer bar to be repaired on the variable On the positioner, continuous annular welding is performed on the groove to be repaired by the CMT automatic welding system to complete the repair of the buffer bar to be repaired; S5, post-weld slow cooling treatment is performed on the repair buffer bar obtained in step S4; S6, the repair area of ​​the repair buffer bar is Machined to original drawing size and then sandblasted as a whole. The method of the invention has low cost, high efficiency and high repairing quality, and the quality standard of new parts can be reached after repairing and remanufacturing through the method of the invention.

The invention relates to a supersonic-speed flame spraying type flux-cored wire and a preparation method of the supersonic-speed flame spraying type flux-cored wire. The flux-cored wire comprises a cylindrical cover made of a steel strip, a through hole which penetrates through the outer cover along the axis is formed in the outer cover, and the through hole is filled with core powder which comprises, by weight, 45-60 parts of metal powder, 40-50 parts of alloyed powder and 8-18 parts of mineral powder. The preparation method includes the steps that firstly, core powder is prepared, meanwhile, the steel strip is rolled to be of a U-shaped groove structure, and the core powder accounting for, by weight, 17%-19% the flux-cored wire is added into the U-shaped groove; then, the through hole penetrating through the steel strip is formed in the axial direction of the steel strip after the opening of the U-shaped groove is closed through a forming machine, wherein the core powder is wrapped in the through hole; finally, line-by-line drawing and diameter reduction are carried out on the steel strip through a drawing machine so as to obtain the supersonic-speed flame spraying type flux-cored wire. The supersonic-speed flame spraying type flux-cored wire prepared through method is high in welding speed and high in efficiency, little spatter occurs in the welding process, weld formation is good, the amount of welding fume is small, the amount of produced welding slag on the surface of a weld layer is small, and weldments are free of pits or pores.

The invention discloses a flux-cored welding wire for additive manufacturing. The welding wire includes a flux core and a steel skin. The flux core is composed of the following components according to the mass percentage: 2.00%-3.83% of ferromanganese powder, 16.95%-20.85% of nickel powder, and 8.35% of chromium powder. %~11.65%, molybdenum powder 1.05%~3.00%, ferrovanadium powder 0.90%~1.62%, boron powder 0.05%~0.10%, ferrotitanium powder 2.16%~10.82%, ferrosilicon powder 0.5%~1.5%, aluminum magnesium powder The powder is 0.50% to 1.00%, the rare earth element is 0.80% to 1.00%, the rest is iron powder, and the sum of the mass percentages of the above components is 100%. The flux-cored welding wire is a low-alloy steel arc additive manufacturing welding wire for fan impellers; also disclosed The preparation method of low-alloy high-strength steel is presented; the flux-cored welding wire has excellent comprehensive mechanical properties, and the method of additive manufacturing of low-alloy high-strength steel can not only meet the requirements of mechanical properties, but also be efficient and convenient.

The invention discloses a recycled gas-shielded flux cored wire component and a preparation method thereof, which belong to the field of welding. The recycled gas-shielded flux cored wire component is characterized be comprising the components by the weight portions as follows: 35-65 percent of TiO2, 5-15 percent of MnO, 5-15 percent of MgO, 5-15 percent of SiO2, 1-15 percent of Fe2O3, and 1-15 percent of Al2O3. The invention is characterized in that the invention discloses a method for collecting, processing and recycling welding slag of rutile cored wires to replace rutile; through the steps of coarse screening, coarse grinding, magnetic separating and fine grinding, the granularity and chemical components of the welding slag are driven to satisfy requirements; and then the welding slagof the rutile cored wires can be used as a cored wire component to be added into gas-shielded flux cored wires to reach the purposes of replacing or partially replacing natural rutile, saving resources and reducing costs. As long as the powder components and granularity of the welding slag after processing and preparing are in the scope of the recycled gas-shielded flux cored wire component, the recycled gas-shielded flux cored wire component can be recycled for a plurality of times.

The invention belongs to the technical field of preparation of welding materials, particularly relates to a preparation method of surfacing electrodes. The preparation method comprises the following steps of firstly, smashing diatomite, mixing the smashed diatomite with methane fluid to obtain a mixture A, fermenting the mixture A, and drying the fermented mixture A; using nanometer iron powder as a catalyst, enabling silicon dioxide in the diatomite and charred organic matter to react at high temperatures to obtain silicon carbide whiskers, and enabling the obtained silicon carbide whiskers and the redundant charred organic matter to jointly form a sintering feed; then enabling ortho-silicic acid generated by the hydrolyzing of tetraethoxysilane and potassium hydroxide to react so as to obtain bonding liquid; and finally, uniformly mixing the bonding liquid with activated carbon and metal powder to obtain a mixture B, and pressing the obtained mixture B and a welding core, and performing drying so as to obtain the surfacing electrode. According to the preparation method disclosed by the invention, the compositions of electrode covering flux do not have mineral powder, and no slag is generated in each welding seam basically; in the welding process, the silicon carbide whiskers and the charred organic matter react with oxygen in the air to realize heat emission, and the self-made bonding liquid is matched for use, so that the arc stability of the surfacing electrode and the strength of the welding seam are improved.

The invention provides a low-dust low-nitrogen electric welding rod. A cover is prepared from, by mass, 10-12% of titanium dioxide, 25-28% of wollastonite, 11-15% of barium carbonate, 8-10% of magnesite, 10-15% of talcum powder, 5-8% of silicon-aluminium-barium, 3-5% of manganese metal, 2-5% of low-carbon ferromanganese, 3-5% of ferrotitanium, 2-4% of aluminum powder, 2-4% of starch, 4-7% of ricehull powder and 0.8-1.5% of adhesion agent. The cover contains no fluoride or Na and K aikali metal compound, and has the low cover weight coefficient, and welding dust can be greatly reduced. The invention further provides a preparation method of the low-dust low-nitrogen electric welding rod. Ingredient formula enhancement and technology enhancement are combined, the technological performance ofthe electric welding rod is excrement, the total amount of fumes is low, and operation conditions are improved.

The invention discloses a carbon dioxide gas shielded welding flux-cored wire, which is characterized in that the flux-cored powder of the wire is mixed by the following components in percentage by weight: 10-30% of rutile, 10-30% of silicomanganese, 15-40% of iron powder, 2-15% of nickel powder, 2-25% of chromium metal, 1-5% of aluminium magnesium alloy, 2-10% of ferromolybdenum and 2-10% of ferrovanadium. The carbon dioxide gas shielded welding flux-cored wire disclosed by the invention has the advantages that the hardness and the non-deforming performance of a hot mill guide plate, a hot-forging die, a valve and the like are still can be kept even if the hot mill guide plate, the hot-forging die, the valve and the like work under the high-temperature impact load for a long time.