33results about How to "Improve porosity resistance" patented technology

The invention provides a superaustenitic stainless steel electrode. A coating of the superaustenitic stainless steel electrode at least comprises the following components, by mass, 35 to 45 percent of rutile, 2 to 5 percent of titanium dioxide, 6 to 12 percent of marble, 6 to 12 percent of dolomite, 1 to 3 percent of quartz, 3.5 to 6.5 percent of cryolite, 4 to 8 percent of dehydrated feldspar, 3 to 5 percent of dehydrated phlogopite, 6 to 8 percent of chromium metal, 6 to 8 percent of electrolytic manganese, 3 to 6 percent of ferrotitanium, 1 to 2 percent of chromium oxide green, 2 to 4 percent of nickel powder, 0.5 to 1.5 percent of ferromolybdenum and 0.5 to 1.5 percent of sodium alginate. The coating of the superaustenitic stainless steel electrode is formed by mixing all the components according to the proportions, potassium and sodium are added to be mixed with sodium silicate, and the coating coats a core wire H02Cr20Ni25Mo4Cu to form the electrode. Carbon content is extremely low, comprehensive corrosion of sulfuric acid and phosphoric acid can be resisted, the corrosion of acetic acid at any temperature and in any concentration under ordinary pressure can be resisted, and an ideal welding material is provided for steel for manufacturing various strong acid storing and transporting containers.

The invention discloses a low-hydrogen high-toughness seamless flux-cored wire for low-temperature steel. The seamless flux-cored wire is composed of low-carbon steel strip skin and flux core powder and used for welding of the low-temperature steel adopted in a LPG ship and a liquefied petroleum storage tank. The low-hydrogen high-toughness seamless flux-cored wire is formed by mixing, by mass percentage, 30-40% of rutile, 0.5-1% of sodium fluoride, 10-16% of manganese-silicon alloy, 1-2% of zircon sand, 5-9% of rare earth silicon iron, 10-12% of nickel powder, 3-5% of magnesium powder, 0.3-0.6% of ferroboron, 1-5% of titanium powder, 2-4% of potassium titanate, 0.5-1% of magnesia, 1-2% of magnetite and 12-14% of iron powder. The seamless flux-cored wire is high in impact toughness at thelow temperature, applicable to all-position welding, good in welding manufacturability and meanwhile good in seawater corrosion resistance and ultralow in diffusible hydrogen; and the low-hydrogen high-toughness seamless flux-cored wire is mainly applied to welding of the low-temperature steel of the LPG ship, the liquefied petroleum storage tank and the like.

A solid wire which is for use in gas-shielded arc welding that employs a shielding gas and which is for use in welding galvanized steel sheets. The solid wire contains C, Si, Mn, P, S, O, and Cr in respective given amounts relative to the total mass of the solid wire, the remainder comprising Fe and unavoidable impurities. The solid wire satisfies the relationships 1.0<=(Si mass%+Mn mass%) / {100(S mass%+O mass%)}<=4.0 and 0.50<=(Mn mass% / Si mass%)<=2.00. The shielding gas is an argon gas which contains 25-40% CO2 gas. Improvements in spattering inhibition and pore generation inhibition (performance of inhibiting the generation of pore defects such as pits or blow holes) and an excellent bead appearance are rendered possible.

Disclosed is a method for fabricating a seamless tube welding wire containing rutile cored powders by a mild-carbon steel strip. The method includes that by weight, 30%-50% of rutile, 2%-5% of dehydrated feldspar, 5%-10% of silicon iron, 1%-8% of ferrotitanium, 5%-15% of manganese metal, 2%-5% of zircon sand, 3%-8% of mineral magnesia, 2%-6% of quartz, 0.5%-2% of zirconium metal and the balance iron powders are fully and uniformly stirred to form the rutile cored powders, and the rutile cored powders are stored in a feeding device for stand-by, the mild-carbon steel strip is rolled to form a U-shaped steel strip, the cored powders are filled in the U-shaped steel strip at a rolling speed of 2-10m / s, the filling rate is controlled within 14%-18%, then a seamed tube in the diameter of D is formed by rolling, a seamless tube welding wire tube blank is formed by on-line welding of a laser-beam welding machine or a high-frequency welding machine, the seamless tube welding wire tube blank is subjected to high frequency annealing at 500-1200 DEG C, then the diameter of the seamless tube welding wire tube blank is reduced by a cold-drawn machine to form a D1 seamless tube welding wire, and then the D1 seamless tube welding wire is copperized so as to form the seamless tube welding wire containing the rutile cored powders.

The invention relates to a CO2 gas protection flux-cored wire for matching welding of low-alloy steel with the strength of 490 MPa. The CO2 gas protection flux-cored wire is made of a steel belt and flux-cored powder, wherein the flux-cored powder comprises the following components in parts by weight: 4-10 parts of sintering powder, 0.1-0.7 part of Fe3O4, 0-1.0 part of TiO2, 0.1-0.5 part of Al, 0-0.4 part of Ti, 0.1-0.5 part of Si, 2.0-2.5 parts of Mn and 1.0-2.0 parts of Fe. The CO2 gas protection flux-cored wire has the beneficial effects that the mechanical property of the weld metal of the produced flux-cored wire can meet the technical index requirements; the moisture absorption capability of the produced flux-cored wire is greatly improved, so that the pore resistance of the flux-cored wire is enhanced, and i.e., no pore is generated in welding after the unpacked CO2 gas protection flux-cored wire is placed for seven days under the environment with 80% relative moisture.

Provided is a welding method for a zinc plated steel plate (W) that uses pulse welding in which a pulse peak current (Ip) and a base current (Ib) are repeatedly applied and uses a shielding gas in which CO2 or O2 is added to Ar at 1 - 10% by mass, wherein the pulse peak time (Tp) for the pulse peak current (Ip) is within a prescribed range for one period (Tpulse) according to the plate thickness of the zinc plated steel plate (W).

The invention belongs to the technical field of welding materials, and particularly relates to a 550 MPa-grade flux-cored wire with excellent moisture resistance. The flux-cored wire comprises a carbon steel sheath and a flux core. The flux core comprises the following components in percentage by mass: 34-42% of rutile, 2-6% of electrolytic manganese, 10-15% of silicon-manganese alloy, 14-18% of nickel powder, 2-6% of ferrotitanium, 1-5% of aluminum-magnesium alloy, 1-3% of sodium fluoride, 1-4% of zircon sand, 4-8% of ferroboron, 1-3% of potassium titanate, 2-6% of silicon iron, 1-6% of magnesium powder, 2-5% of feldspar, 1-5% of fluorinated ethylene propylene and the balance iron powder. According to the 550 MPa-grade flux-cored wire with the excellent moisture resistance, pure CO2 serves as shielding gas, the 550 MPa-grade flux-cored wire can be used in a maritime work construction working environment, the impact toughness requirement at -40 DEG C is met, the diffusible hydrogen content is lower than 5 ml / 100 g, the yield strength grade of the flux-cored wire is 460 MPa grade, the tensile strength grade reaches 550 MPa grade, and the flux-cored wire is good in cold crack resistance, extremely high in moisture absorption resistance and high in pore resistance.

The invention belongs to the technical field of welding materials, and particularly relates to a small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding. The small-sized self-shielded flux-cored wire comprises a carbon steel skin and a flux core filled in the carbon steel skin, wherein the flux core comprises the following the components according to the total mass percent of the flux core: 40-45% of calcium fluoride, 4-7% of lithium fluoride, 10-13% of marble, 12-14% of aluminum powder, 1-2% of zirconium metal, 5-8% of manganese metal and the balance being iron powder. The small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding is used for the welding of a light steel structure. The small-sized self-shielded flux-cored wire provided by the invention adopts a calcium fluoride-lithium fluoride-marble slag system, and the slag system is mainly composed of high calcium fluoride; a large amount of fluoride improves the anti-porosity ability of the flux-cored wire; meanwhile, the lithium fluoride with the relatively good arc-stabilizing effect is added, so that little welding spatter occurs at the flat position of welding; gas protection is not needed; and the small-sized self-shielded flux-cored wire meets E71T-GS related requirements in American Standard AWS 5.20.

The invention relates to a flux-cored wire for austenitic stainless steel all-position welding, and the flux-cored wire is composed of a flux core and an external stainless steel belt, wherein, the flux core accounts for 22-24wt% of the flux-cored wire, and the flux core comprises the following components in percentage by weight: 20-23% of metal chromium powder, 7-8.5% of metal nickel powder, 2-4% of electrolytic manganese metal, 3-4% of aluminium powder, 0.5-1% of ferrotitanium, 32-34% of rutile, 1-2% of quartz, 2-4% of zircon sand, 4-6% of albite, 2-4% of potassium feldspar, 1-1.5% of cryolite, 1-1.5% of lithium carbonate, 0.1-0.5% of bismuth oxide and the balance of iron powder. The ratio of the albite to the potassium feldspar in the flux core is 1.2-2, the sum of the albite and the potassium feldspar is not more than 10wt% of the flux core, the external stainless steel belt is the austenitic stainless steel 304L, the carbon content is less than 0.025wt%, the diameter of the flux-cored wire is 0.9-1.2mm, and the flux-cored wire can be used for realizing the austenitic stainless steel all-position welding.

A high-cellulose welding electrode is disclosed, and it features that its coating contains 15 components including pyroceram, starch, bamboo powder, rutile, titanium oxide powder, etc.. The low-modulus water glass with high K / Na ratio is used as adhesive. Its advantages include high mechanical performance, no air pores in welded seam, and high low-temp. toughness.

The welding method of galvanized steel sheet (W) uses pulse welding in which pulse peak current (Ip) and base value current (Ib) are repeatedly applied, and CO is added to Ar at 1 mass % or more and 10 mass % or less. 2 or O 2 In the welding method of the galvanized steel sheet (W), the pulse peak time (Tp) of the pulse peak current (Ip) is set to 1 cycle according to the thickness of the galvanized steel sheet (W). within the given range.

The invention belongs to the technical field of welding materials, and particularly relates to a small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding. The small-sized self-shielded flux-cored wire comprises a carbon steel skin and a flux core filled in the carbon steel skin, wherein the flux core comprises the following the components according to the total mass percent of the flux core: 40-45% of calcium fluoride, 4-7% of lithium fluoride, 10-13% of marble, 12-14% of aluminum powder, 1-2% of zirconium metal, 5-8% of manganese metal and the balance being iron powder. The small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding is used for the welding of a light steel structure. The small-sized self-shielded flux-cored wire provided by the invention adopts a calcium fluoride-lithium fluoride-marble slag system, and the slag system is mainly composed of high calcium fluoride; a large amount of fluoride improves the anti-porosity ability of the flux-cored wire; meanwhile, the lithium fluoride with the relatively good arc-stabilizing effect is added, so that little welding spatter occurs at the flat position of welding; gas protection is not needed; and the small-sized self-shielded flux-cored wire meets E71T-GS related requirements in American Standard AWS 5.20.

The invention relates to a flux-cored welding wire, which includes a steel strip and powder filled inside the steel strip. The components contained in the powder and their mass percentages in the total amount of the powder are as follows: 35-50% rutile, 5-50% limestone 8%, graphite 0.4‑0.6%, alumina 5.5‑8.5%, magnesium alloy 3.5‑6.5%, fluoride 2‑5%, silicon manganese alloy 1.6‑2.8%, boron powder 4‑8%, chromium powder 3‑ 6%, nickel powder 2.5-3.5%, titanium powder 0.8-2%, aluminum powder 0.5-1.5%, niobium powder 0.1-0.5%, and the balance is iron powder. The invention has the effect of improving the porosity resistance performance when the flux-cored welding wire is welded with the parent metal.

The invention relates to a seamless self-protected flux-cored welding wire for low-nitrogen non-magnetic ship steel welding. The technical scheme is as follows: the seamless self-protecting flux-cored welding wire is composed of 70-80wt% stainless steel strip and 20-30wt% flux-cored powder, and the flux-cored powder is filled in the stainless steel strip. The chemical composition and content of the stainless steel strip are: C is 0.03-0.08wt%, Si≤1wt%, Mn≤2wt%, Cr is 18-20wt%, Ni is 8-11wt%, S≤0.03wt%, P ≤0.03wt%, the balance is Fe and inevitable impurities; the chemical composition and content of the core powder are: barium fluoride is 40-43wt%, marble is 5-8wt%, aluminum powder is 8-8 10wt%, silicon powder is 2-4wt%, manganese powder is 7-10wt%, manganese nitride is 2-5wt%, nickel powder is 10-13wt%, chromium powder is 5-7wt%, and the balance is iron powder. The welding seam metal formed by the method for welding low-nitrogen non-magnetic ship steel has high strength, good plasticity and toughness, non-magnetic properties and excellent seawater corrosion resistance.

The invention provides a novel welding rod for a brazing process. The novel welding rod for the brazing process comprises a coating and a core wire; the coating wraps the core wire; sodium silicate and potassium silicate serve as adhesives; the coating adheres to the periphery of the core wire; according to components and the matching ratio, a, the components of the coating comprise 100 parts of marble, 60-100 parts of fluorite, 10-15 parts of silicate, 5-10 parts of aluminum fluoride and 25-35 parts of a multi-component alloy agent; and components of the core wire comprise smaller than or equal to 0.020% of C, smaller than or equal to 0.050% of Si, 0.40-0.60% of Mn, smaller than or equal to 0.006% of S, smaller than or equal to 0.006% of P, smaller than or equal to 0.05% of Cr, smaller than or equal to 0.05% of Mo, smaller than or equal to 0.05% of Ni, smaller than or equal to 0.05% of Ti, smaller than or equal to 0.05% of Cu, and smaller than or equal to 0.001% of As. The laser brazing welding rod little in splashing, low in slag inclusion and good in weld joint mechanical performance is researched and developed.

The invention provides an austenitic stainless steel flux-cored wire resistant to non-oxidizing acid corrosion. The austenitic stainless steel flux-cored wire includes a stainless steel shell and powder arranged in the stainless steel shell in a filled mode. The powder is prepared from the components in percentage by mass: 20-25% of natural rutile, 2-5% of quartz sand, 19-22% of chromium metal, 23-27% of nickel powder, 9-11% of molybdenum powder, 6-8% of copper powder, 2-4% of electrolytic manganese, 3-5% of manganese-nitrogen alloy, and 4-6% of an agglutinant. According to the austenitic stainless steel flux-cored wire, the burning loss of part alloy elements like Cr, Ni, and Mo can be supplied through the powder, and at the same time, the alloy elements like Si and Mn, and Cu and N, canbe transited. By controlling the contents of various powder in the flux-cored wire and controlling the contents and proportions of alloy elements in deposited metal of the flux-cored wire, the chemical component stability of flux-cored wire deposited metal is ensured, and the problems that chemical compositions are not fit and corrosion resistance is not enough when traditional austenitic stainless steel flux-cored wires sold in the market are used for welding novel Cr-Ni-Mo-Cu-N series acid resistance austenitic stainless steel are solved.

The invention provides a superaustenitic stainless steel electrode. A coating of the superaustenitic stainless steel electrode at least comprises the following components, by mass, 35 to 45 percent of rutile, 2 to 5 percent of titanium dioxide, 6 to 12 percent of marble, 6 to 12 percent of dolomite, 1 to 3 percent of quartz, 3.5 to 6.5 percent of cryolite, 4 to 8 percent of dehydrated feldspar, 3 to 5 percent of dehydrated phlogopite, 6 to 8 percent of chromium metal, 6 to 8 percent of electrolytic manganese, 3 to 6 percent of ferrotitanium, 1 to 2 percent of chromium oxide green, 2 to 4 percent of nickel powder, 0.5 to 1.5 percent of ferromolybdenum and 0.5 to 1.5 percent of sodium alginate. The coating of the superaustenitic stainless steel electrode is formed by mixing all the components according to the proportions, potassium and sodium are added to be mixed with sodium silicate, and the coating coats a core wire H02Cr20Ni25Mo4Cu to form the electrode. Carbon content is extremely low, comprehensive corrosion of sulfuric acid and phosphoric acid can be resisted, the corrosion of acetic acid at any temperature and in any concentration under ordinary pressure can be resisted, and an ideal welding material is provided for steel for manufacturing various strong acid storing and transporting containers.

The invention discloses sintered flux for submerged-arc welding of a steel structure U-shaped rib plate. The sintered flux comprises, by mass percent, 15%-25% of MgO, 3%-8% of CaO, 15%-25% of CaF2, 2%-5% of MnO, 25%-35% of Al2O3, 10%-20% of SiO2, 3%-7% of TiO2 and 1%-3% of SiFe. According to the sintered flux, the welding speed can be increased, the stable fusion depth can be provided in the high-speed welding state, and welding forming is attractive.

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.

Disclosed is a method for fabricating a seamless tube welding wire containing rutile cored powders by a mild-carbon steel strip. The method includes that by weight, 30%-50% of rutile, 2%-5% of dehydrated feldspar, 5%-10% of silicon iron, 1%-8% of ferrotitanium, 5%-15% of manganese metal, 2%-5% of zircon sand, 3%-8% of mineral magnesia, 2%-6% of quartz, 0.5%-2% of zirconium metal and the balance iron powders are fully and uniformly stirred to form the rutile cored powders, and the rutile cored powders are stored in a feeding device for stand-by, the mild-carbon steel strip is rolled to form a U-shaped steel strip, the cored powders are filled in the U-shaped steel strip at a rolling speed of 2-10m / s, the filling rate is controlled within 14%-18%, then a seamed tube in the diameter of D is formed by rolling, a seamless tube welding wire tube blank is formed by on-line welding of a laser-beam welding machine or a high-frequency welding machine, the seamless tube welding wire tube blank is subjected to high frequency annealing at 500-1200 DEG C, then the diameter of the seamless tube welding wire tube blank is reduced by a cold-drawn machine to form a D1 seamless tube welding wire, and then the D1 seamless tube welding wire is copperized so as to form the seamless tube welding wire containing the rutile cored powders.