585 results about "Stainless steel welding" patented technology

In accordance with the invention, bodies of materials are joined by disposing between them a reactive multilayer foil and one or more layers of meltable joining material such as braze or solder. The bodies are pressed together against the foil and joining material, and the foil is ignited to melt the joining material. The pressing is near the critical pressure and typically produces a joint having a strength of at least 70-85% the maximum strength producible at practical maximum pressures. Thus for example, reactively formed stainless steel soldered joints that were heretofore made at an applied pressure of about 100 MPa can be made with substantially the same strength at a critical applied pressure of about 10 kPa. Advantages of the process include minimization of braze or solder extrusion and reduced equipment and processing costs, especially in the joining of large bodies.

The present invention provides a ferritic stainless steel welding wire which allows prevention of wire breaking, fine refining of crystal grains, and increased cracking resistance. A wire rod used essentially consists of, in mass %, 0.03% or less of C, 3% or less of B, 3% or less of Mn, 2% or less of Ni, 11 to 20% of Zr, 3% or less of Mo, 1% or less of Co, 2% or less of Cu, 0.02 to 2.0% of Al, 0.2 to 1.0% of Ti, 0.02% or less of O, 0.04% or less of N, at least one of Nb and Ta, the mass % thereof being eight times the total mass % of the C and N to 1.0 mass %, and the balance of Fe and unavoidable impurities. When the number of crystals per square mm (mm2) of a cross section of the wire rod is defined as m, a grain number of the crystal expressed by an exponent (G) in an expression of m=8×2G is set to 3 to 10 by the heat treatment.

In a disk drive suspension circuit, an electrical contact from a flexible circuit to a face of a PZT microactuator is provided by a mechanical bias to press a contact pad of the flexible circuit against the PZT surface. The mechanical bias is provided by a piece of stainless steel that is welded to a nearby point or points on the suspension, and which biases the electrical contact pad carrying the PZT driving voltage against the PZT. The piece of stainless steel may be in the form of a flat piece welded on one or more sides of the contact pad, and may include a dimple for pressing against the contact pad. Additional insulation material may be provided between the dimple and the contact pad to prevent the dimple from penetrating through the flexible circuit's cover layer and shorting the driving voltage.

A welding wire for austenitic stainless steel welding contains, in percent by mass, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 1.0 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: more than 0.30 through 0.50%, limiting 0 to 0.03% or less, P to 0.03% or less, and S to 0.005% or less, and having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent / Ni equivalent) within a range between 0.85 and 1.2 and a PI value of 35 or more, the remainder being iron and unavoidable impurities.

The invention provides a welding technology of super martensitic stainless steel, which comprises the processes of a preweld preparatory process including bevel preparation of super martensitic stainless steel, splicing and assembly of bevel and weld material choosing, a backing welding process and a filling welding and facing welding process, wherein the preweld preparatory process is provided with a preweld preheating step for preheating a welding part at the temperature of 50-70 DEG C; the welding material chosen in the preweld preparatory process comprises two phase stainless steel welding sticks and two phase stainless steel welding rods; the backing welding process adopts manual argon tungsten arc welding; and the filling welding and facing welding process adopts manual argon tungsten arc welding or shielded metal arc welding. The invention improves the performance of welded splices, in particular the rigidity and the decay resistance, omits the heat treatment process after welding, reduces processes, enhances the welding efficiency and reduces the production cost.

An austenitic stainless steel welded joint comprises the following components (by mass%): C: 0.05-0.25%; Si: 2% or less; Mn: 0.01-3%, P: 0.05-0.5%; S: 0.03% or less; Cr: 15-30%; Ni: 6-55%; sol.Al: 0.001-0.1%; and N: 0.03% or less, with the remainder being Fe and impurities, wherein the relationship represented by the following formula is satisfied: (Cr + 1.5 x Si + 2 x P) / (Ni + 0.31 x Mn + 22 x C + 14.2 x N + 5 x P) = 1.388. The welded joint has high creep strength, is economically advantageous and has excellent welding properties, and therefore can be used as a steel pipe, a steel plate or the like in a wide variety of applications for which high temperature strength, corrosion resistance and welding properties are required. In the formula above, each symbol of element represents the content of the element expressed by mass%.

The invention relates to a method for controlling the brittle phases of titanium and stainless steel electronic beam welding joints adopting composite intermediate layers, belonging to the welding field of heterogeneous difficult-welding metal. The invention solves the problem that the tradition metal and stainless steel welding method can not avoid the generation of the brittle phases. The method comprises the following steps of: using pure copper and pure vanadium as the intermediate layers to form members to be welded, wherein the members to be welded consist of stainless steel, pure copper, pure vanadium and titanium, ultrasonically cleaning the members to be welded by acetone, drying the members to be welded after acid washing and water washing, and then performing secondary electronic beam welding in vacuum. The joints obtained by the method have no brittle phases, the tensile strength of the joints is greater than 299 MPa, and the yield strength is greater than 260 MPa. The method is suitable for manufacturing thrust chamber bodies of aircraft engines, nuclear fuel processing equipment in nuclear industry, and titanium / steel composite members and titanium alloy / steel composite members in chemical and medical equipment.

The invention discloses a stainless steel compound welding steel pipe and a manufacturing method thereof. The stainless steel compound welding steel pipe is formed by welding stainless steel compound hotly-rolled rolling plates through a welding line, wherein the welding line is formed by a stainless steel compound welding line and a carbon steel welding line. The manufacturing method comprises the following steps of: milling an edge and arranging a groove; when putting a stainless steel compound layer on the inner layer, firstly utilizing gas shield welding to weld a middle layer; then, utilizing a stainless steel welding strip to weld a stainless steel compound layer welding line in an argon arc welding manner; then, utilizing a carbon steel welding strip to weld the carbon steel welding line by a submerged-arc welding manner; when the stainless steel layer is less than 0.9 mm, directly welding a stainless steel welding line by submerged-arc welding; and when the stainless steel compound layer is located at the outer layer, firstly welding the carbon steel welding line by adopting the carbon steel welding strip and the submerged-arc welding, and adopting the stainless steel welding strip and the argon arc welding manner to weld the stainless steel compound layer welding line. According to the stainless steel compound welding steel pipe and the manufacturing method thereof, the manufactured stainless steel compound welding steel pipe has high structural strength and strong corrosion resistance; and the bonding strength of an inner pipe and an outer pipe is not less than 200 MPa.

The invention discloses a welding method for a stainless steel composite board pressure vessel shell and an insert-type stainless steel connecting pipe. The method comprises the steps of a) arranging a pipe hole of the stainless steel connecting pipe in a stainless steel composite board pressure vessel shell, and manufacturing a pipe hole wall to be a primary bevel with a K shape or a single V shape; b) performing bead-welding on a primary bevel surface by using high chromium nickel stainless steel welding rods to form a transition isolating layer with certain thickness, so as to form a secondary bevel; c) carrying out stress-relief heat treatment on the stainless steel composite board pressure vessel shell after the bead welding; and d) welding corner connecting joints between the stainless steel connecting pipe and the stainless steel composite board bead-welding layer by using stainless steel welding rods with different materials according to a stainless steel composite layer on a composite board. As the transition isolating layer with the certain thickness is firstly bead-welded on the primary bevel of the basic layer side of the stainless steel composite board by using the high chromium nickel stainless steel welding rods, and then the corner connecting joints are welded by the stainless steel welding rods, so that carbon steel and low alloy steel components are transited into stainless steel components, the welding line plasticity can be transited from low to high, cracks are avoided, and the using performance is reliable.

The invention relates to a flux-cored wire for welding duplex stainless steel, and the flux-cored wire is used in the welding field of the material processing technology. During the welding of the duplex stainless steel, joint pitting erosion and impact elasticity can not be met by utilizing austenite stainless steel welding material. The invention provides the flux-cored wire for welding the duplex stainless steel, 17 percent to 24 percent flux-cored powder is filled into stainless steel belt. The invention is characterized in that the mass percent of the components of the flux-cored is as follows: 35 percent to 40 percent of chromium powder, 11 percent to 15 percent of molybdenum powder, 2 percent to 4 percent of nickel powder, 3 percent to 5 percent of manganese powder, 1 percent to 5 percent of magnesia chrome, 1 percent to 3 percent of ferrosilicon, 4 percent to 9 percent of rock crystal, 2 percent to 6 percent of feldspar, 21 percent to 30 percent of rutile, 0.5 percent to 4 percent of Al2O3, 0 percent to 5 percent of zircon, 0.5 percent to 3 percent of Bi2O3, and 0.5 percent to 3 percent of manganese nitride. The invention leads the duplex stainless steel welding joint to have the anti good pitting erosion performance and the good impact elasticity.

The invention relates to a flux-cored wire for stainless steel welding, and particularly discloses the flux-cored wire for stainless steel welding. The flux-cored wire is composed of flux-cored powder and a stainless steel belt, wherein the flux-cored powder is wrapped by the stainless steel belt. The flux-cored wire for stainless steel welding is characterized in that the flux-cored powder accounts for15-25% of the total weight of the flux-cored wire, the flux-cored powder comprises, by weight, 30-38 parts of metal chromium powder, 6-15 parts of metal nickel powder, 3-10 parts of metal manganese powder, 20-35 parts of rutile, 1-6 parts of silicon iron, 1-7 parts of ferrotitanium, 2-10 parts of feldspar, 5-10 parts of quartz, 1-5 parts of rare earth fluoride, 1-5 parts of metal nitride powder and appropriate iron powder, and the total flux-cored powder is, by weight, 100 parts. A reduction jar of the flux-cored wire for welding is long in service cycle, and deposited metal formed by the flux-cored wire has the excellent effects of high temperature oxidation resistant capacity and high temperature sulphur corrosion resistant capacity.

The invention discloses a transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel. The transient liquid phase diffusion bonding process comprises the following steps that (1) before welding, the surfaces to be welded of the molybdenum copper alloy and the stainless steel are cleaned, wiped and blown to be dry until the surfaces to be welded show metallic luster; (2) a composite middle layer is added between contacting surfaces to be welded of the molybdenum copper alloy and the stainless steel, and then a workpiece to be welded is put in a vacuum chamber and is pressed tightly through an upper pressing head and a lower pressing head; (3) when the vacuum chamber is vacuumized until the vacuum degree reaches 10-4 Pa, transient liquid phase diffusion welding is carried out on the assembled workpiece made of the molybdenum copper alloy and the stainless steel; (4) cooling is carried out after welding, and the welding workpiece made of the molybdenum copper alloy and the stainless steel is taken out. The transient liquid phase diffusion bonding process of the molybdenum copper alloy and the stainless steel completely achieves diffusion bonding between the molybdenum copper alloy and the stainless steel, can obtain a diffusion bonding connector made of the molybdenum copper alloy and the stainless steel with the shearing strength reaching 120 M Pa, can meet the use requirements of a composite structure made of the molybdenum copper alloy and the stainless steel, and has the advantages of being low in cost, simple, convenient, high in applicability, convenient to popularize and apply and the like.

The invention relates to a copper and stainless steel brazing process, which is characterized by comprising the following steps of 1) processing before brazing; 2) assembling joints; 3) adding brazing filler metal and brazing flux; 4) brazing; and 5) processing after brazing. Since silver-base brazing filler metal is replaced by copper-base brazing filler metal in the process, manufacturing cost is reduced and noble metal resources are saved greatly. Brazing is realized in the air without protective gas so that expenses for consumption of nitrogen gas, argon gas and the like are reduced. Due to the fact that the technology of brazing in a protective gas furnace or vacuum furnace is replaced by the technology of brazing by induction heating, electric power is saved. Accordingly, the copper and stainless steel brazing process is reliable, requires short production time, enables pass rate to be high, saves energy sources and is suitable to be used for batch production.

The invention discloses an argon tungsten arc process of molybdenum copper and a dissimilar stainless steel material. The method comprises the steps of cleaning the surface of the molybdenum copper and the surface of the stainless steel, which are to be connected, and the surface the Cr-Ni alloy system welding wire used for filling before welding; preheating by using a tungsten electrode argon arc inclining to the molybdenum copper first after arc starting; adopting pure argon protection; keeping down the argon arc to control heat distribution and to conduct filler rod argon tungsten-arc welding. The method has the advantages of convenient operation and strong applicability. Furthermore, the obtained welding joint of the molybdenum copper and the stainless steel has higher strength and stable property, and can be widely used for welding the molybdenum copper and the stainless steel and other dissimilar materials, thus being worth popularization and application.

The invention relates to an acidic coating super duplex stainless steel welding rod and belongs to welding material technology. The invention adopts 2507 duplex stainless steel wires as the welding core; the components and the weight percentages of the components of the welding rod coating are as follows: 30-40 of rutile, 3-7 of titanium dioxide, 15-20 of potash feldspar, 1-3 of phlogopite, 5-10 of marble, 16-20 of metal powder, 0.5-1.5 of rare earth fluoride, 2-3 of cryolite, 5-8 of chrome green, 0.5-1.0 of soda, and 1.5-3.5 of ferroalloy. The welding rod of the invention has the advantages, showed by the test results of manufacturability, metallographic observation, mechanical property and corrosion resistance, that the welding rod has extremely good welding technical property; electric arc is stable during welding, and spattering does not basically exist; the formation of weld joints is good; slag detachability is good; the manipulability of the welding rod is excellent; through metallographic observation, the content of ferrite in the structure of welding joints ranges from 40 percent to 60 percent, and the phase ratio can meet engineering application requirement; the welded welding joint has excellent mechanical property, and tensile strength can be more than 800 MPa; low temperature toughness is good; the stress corrosion resistance and pitting corrosion resistance of the welding joint are excellent.

The invention discloses a low-hydrogen basic electrode for welding FV520 (B) stainless steel, comprising a core wire and an electrod covering, wherein the electrode covering comprises the following materials in weight percentage: 35%-45% of marble, 18%-26% of fluorite, 6%-9% of quartz, 3%-6% of zircon sand, 6%-12% of rutile, 1%-3% of ferrosilicon, 6%-10% of ferrotitanium, 5%-11% of low-carbon ferromanganese, 1%-3% of rare-earth ferrosilicon and 0.5%-1.5% of sodium carbonate, and the sum of the weight percentages of the components is 100%. Compared with the traditional special imported electrode for the FV520 (B) stainless steel, the electrode made of the electrode covering has the advantages of favorable arc stabilization performance, good fluidity of a molten bath, less splash and dust, easier slag removal after welding, uniform slag coverage, and delicate and attractive welding joint formation. The content of diffusible hydrogen generated by using the developed electrode for depositing metal is effectively controlled and meets the requirements of low-carbon contents.

The invention discloses a high-entropy alloy welding wire for welding titanium / stainless steel in a TIG (Tungsten Inert Gas) mode. The high-entropy alloy welding wire is formed by the following components in atomic percent with the total percent of 100 percent: 5 percent of Ti, 5 percent to 10 percent of Fe, 25 percent to 30 percent of Cr, 25 percent to 35 percent of Cu, and 25 percent to 35 percent of Ni. The invention also discloses a method for using the high-entropy alloy welding wire to weld the titanium / the stainless steel in the TIG mode. The welding material cost is low, the preparation is simple, the welding method is convenient and easy to implement, the adaptability is wide, and an obtained titanium and stainless steel welded joint is good in formation of weld, free of cracks, high in intensity and good in toughness.

The invention discloses an austenitic stainless steel welding seam structure corrosive agent and an application method thereof. The corrosive agent is composed of concentrated hydrochloric acid, cupric chloride, and absolute ethyl alcohol. The application method comprises the following steps: 1) preparation of a metallographic sample: a stainless steel weld sample block is subjected to grinding bywaterproof abrasive paper with different granularity and mechanical polishing; 2) corrosion of the metallographic sample: the metallographic sample is immersed to corrosion liquid for corrosion; and3) observation of the corrosive metallographic sample: the corrosive sample is taken and the sample is flushed with a lot of water and alcohol, and air drying is performed and dendritic structure is observed under a microscope. The austenitic stainless steel welding seam structure corrosive agent has the advantages of simple preparation, easy storage, convenient operation, and obvious corrosion effect; the corrosive fusion line and weld dendrite are obvious, the structure is intelligible, and over corrosion or nonuniform corrosion phenomenon cannot be generated. The improved welding mode is improved, and according to bonding of austenitic stainless steel weld, each performance of stainless steel weld assembly is greatly improved.

The invention relates to a stainless steel material, a welding wire and a welding wire coil; and the material comprises the following components in percentage by weight: 0 to 0.03 percent of C, 0.5 to 1.0 percent of Mn, 0.5 to 1.0 percent of Si, 12.5 to 14.5 percent of Cr, 0.2 to 0.3 percent of Ti, 5.5 to 6.5 percent of Ni, 0 to 0.015 percent of S, 0 to 0.02 percent of P, and the balance Fe and other inevitable impurity elements. When being applied in ferritic stainless steel and martensitic and ferritic dual-phase stainless steel welding, the stainless steel welding material can replace austenitic stainless steel. The stainless steel welding material is applicable to welding under the condition that the heat input is 5 to 7kJ / cm.

The invention discloses a narrow gap laser hot-wire-filling welding process for a 316LN thick plate. Solder wires are heated through current, base metal is heated through laser, and solder wire transition stability and deposition efficiency are increased. The process includes: machining a welding part of a stainless steel welding plate into a V-shaped groove with a truncated edge 1.8-2.2mm in size and a top-end groove 3.0-4.0mm in size, selecting solder wire brand as 1.4455 and solder wire diameter as 1.2mm, bottoming through laser hot wire filling, performing laser hot wire filling with each layer not more than 3mm, and welding a cover face through laser hot wire filling. By the process, narrow gap welding of the 316LN thick plate is achieved, and welding is stable. The welded joint obtained by the method is attractive in welding joints, low in welding deformation, good in joint performance, and free of cracks, air holes and the like.

The invention provides a high-strength austenitic stainless steel submerged-arc welding wire and belongs to the technical field of welding wires. Chemical components of the stainless steel welding wire comprise, by mass, C<=0.025%, Si<=1.00%, Mn<=2.50%, P<=0.020%, S<=0.010%, 12.00-14.00% of Ni, 18.00-20.00% of Cr, 2.00-3.00% of Mo, 0.05-0.10% of N, Nb<=0.150% and the balance iron. High-temperature ferrite delta in cast-condition austenitic stainless steel is 8-15%. By means of the welding wire, the problem that a device is poor in weld line mechanical property when the device runs at high temperature for a long time is solved. The welding wire can be mainly used for welding materials for energy industry, chemical industry and the like at high temperature and under high pressure.

The invention discloses a double-phase stainless steel electric welding bar, and relates to the stainless steel electric welding field of electric arc welding. The invention provides a novel titanium-calcium type double-phase stainless steel electric welding bar, which has good welding performance such as little splash, low cost, good slag removal performance and the like. The electric welding bar is characterized in that: according to the coating formula, the electric welding bar comprises the following components in part by weight: 35 to 38 parts of rutile, 8 to 10 parts of natural mica, 1 to 2 parts of potassium titanate, 5 to 7 parts of marble, 10 to 12 parts of iron powder, 1 to 2 parts of bentonite, 2 to 3 parts of electrolytic manganese, 3 to 5 parts of fluorite, 1 to 2 parts of potassium feldspar, 1 to 2 parts of sodium alginate, 2 to 3 parts of chromium nitride, 20 to 24 parts of chromium metal, 8 to 10 parts of ferromolybdenum, 2 to 4 parts of magnesite, 2 to 4 parts of nickel powder and 1 part of Teflon. The welding process performance of the stainless steel welding bar is improved, and particularly the application range of the stainless steel welding bar is enlarged during welding, so the double-phase stainless steel electric welding bar has good welding performance such as good electric arc stability, little splash, low cost, good slag removal performance and the like.

The invention discloses a stainless steel welding electrode used for a third-generation nuclear power main pipeline and a production method of the stainless steel welding electrode, and belongs to the field of welding materials. The stainless steel welding electrode is composed of a chromium-nickel-molybdenum alloy welding core and a coating wrapped on the surface of the welding core, the welding core is composed of smaller than or equal to 0.020wt% of C, 1.00-2.50wt% of Mn, smaller than or equal to 0.30wt% of Si, 18.0-21.0wt% of Cr, 11.0-14.0wt% of Ni, smaller than or equal to 2.00-3.00wt% of Mo, smaller than or equal to 0.050wt% of Co, smaller than or equal to 0.050wt% of Cu, smaller than or equal to 0.010wt% of S, smaller than or equal to 0.015wt% of P and the rest Fe and impurities. Weight of the coating is 30-45% of that of the chromium-nickel-molybdenum alloy welding core. The method includes after uniformly mixing coating powder, adding a binder with the weight being 15-20% that of the coating for uniform mixing, feeding a mixture into a plodder to coat the mixture on the welding core, and subjecting the welding core to low-temperature baking and high-temperature baking. The stainless steel welding electrode has the advantages that content of ferrite in deposited metal is proper, and ferrite number FN of the deposited metal is 5-16; the deposited metal of the welding electrode is excellent in mechanical performance and meets nuclear power requirements; room temperature Rm is larger than or equal to 520Mpa, Rp0.2 is larger than or equal to 205Mpa, and A is larger than or equal to 35.0%; mechanical performance at high temperature of 350 DEG C includes that Rm is larger than or equal to 430Mpa, Rp0.2 is larger than or equal to 125Mpa, and A refers to actual measurement.

A stainless heat-proof self-protecting flux-cored wire for a magnesium smelting reduction tank belongs to the technical field of materials processing engineering. A normal stainless steel band 304L or common carbon steel serves as a coating layer, and alloys in a powder core are rutile, sodium carbonate, feldspar, compound fluorides, chromium, nickel, manganese, molybdenum, chromium nitride, aluminium-magnesium alloy, misch metal and iron power. Compared with a conventional stainless steel welding rod, the stainless heat-proof self-protecting flux-cored wire has the advantages that higher welding current can be used; higher welding speed can be realized; the production efficiency is improved; and the labor intensity is lowered; c. Compared with a conventional stainless steel submerged-arc welding solid wire, the stainless heat-proof self-protecting flux-cored wire has the advantages that all-position welding can be realized; the heat input is small; the slag detachability is good; and the manufacturing technique is simpler. A welded joint formed by using the stainless heat-proof self-protecting flux-cored wire provided by the invention has favorable heat resistance, oxidation resistance, vulcanization and corrosion resistance and high-temperature creep resistance compared with welded joints formed by welding the stainless steel welding rod and the stainless steel solid wire.

A welding stainless steel electrode with improved slag detachability and welding quality is composed of a core and a coated flux layer prepared proportionally from rutile, feldspar, marble, fluorite, wollastonite, megnesite, titaniunm oxide powder, hematite, aluminum fluoride, mice, barium carbonate, Cr, Ni, sodium carbonate, electrolytic manganese and ferrotitanium.

The invention relates to a laser welding method of a titanium alloy-stainless steel dissimilar metal by adopting a composite intermediate layer, and belongs to the technical field of material welding (connection). According to the method, laser is adopted as a welding heat source, and a Ta / V / Fe composite layer is used as an intermediate layer material, so that formation of an omega brittle phase in a titanium alloy-vanadium welding line and an alpha brittle phase in a vanadium-stainless steel welding line can be controlled, the joint brittleness can be reduced, and the joint performance can be improved; by adopting the two welding, a high-quality high-efficiency welding joint which is made of a dissimilar metal material and contains a titanium alloy-vanadium welding line, an unmolten vanadium layer and a vanadium-stainless steel welding line can be obtained. The process comprises the steps of plate assembling and clamping, preload adjustment of a titanium alloy-intermediate layer-stainless steel contact face, and laser welding along the center line of a Ta intermediate layer and the center line of a Fe intermediate layer, so that connection of the titanium alloy-stainless steel dissimilar metal can be realized. The method has the advantages of stable welding process, attracted welding line formation, no welding defects including crack, pore, undercutting, uncomplete welding, incomplete fusion and the like, and good welding process performance.

The invention relates to a super diphase stainless steel welding material and a production method thereof. The production method sequentially comprises the following procedures of: (1) melting; (2) re-melting electroslag; (3) forging; (4) rolling steel; and (5) drawing. The super diphase stainless steel welding material has favorable pitting resistance, crevice corrosion resistance, vacuole resistance, abrasion corrosion resistance and high fatigue strength in seawater media and good uniform corrosion resistance in various environments, and is the type of steel with strong suitability and wider application range on various media. The mechanical property of the material is shown in as below: sigmab / Mpa>=650, sigma0.2 / Mpa>=450, delta5 / %>=25, Ak / J>=150, HRC-20.

A flux-cored wire for titanium- or niobium-contained austenitic stainless steel welding comprises welding flux powder and an external-use stainless steel band. A flux core accounts for 21.0-25.0% of the total weight of the flux-cored wire. The flux core comprises, by weight percentage, 15.0-18.0% of chromium powder, 9.5-11.0% of nickel powder, 4.0-5.0% of ferroniobium, 4.0-6.0% of electrolytic manganese, 1.0-3.0% of silicon-calcium alloy powder, 10.0-15.0% of rutile, 3.5-5.0% of quartz, 15.0-20.0% of zircon sand, 6.0-11.0% of feldspar, 1.5-2.5% of cryolite, 0.5-1.0% of lithium carbonate, 0.5-0.8% of bismuth oxide, and the balance of iron powder. In the flux core, the proportion of the content sum of titanium dioxide and zirconium dioxide to the content of silicon dioxide is 1.5-2.0; the proportion of the content of manganese powder to that of silicon-calcium alloy powder is 2.0-3.0. The external-use stainless steel band is austenitic stainless steel band 304L with carbon content lower than 0.02wt%. The diameter of the flux-cored wire is 0.9-1.2mm. By the flux-cored wire with good welding process property, all-position welding of titanium- or niobium-contained austenitic stainless steel can be achieved.

The invention provides an austenitic stainless steel submerged-arc welding wire with excellent high-temperature strength and belongs to the technical field of welding wires. The stainless steel welding wire provided by the invention comprises the following chemical components by mass percent: 0 to 0.025% of C, 0 to 1.00% of Si, 0 to 2.50% of Mn, 0 to 0.020% of P, 0 to 0.020% of S, 9.00% to 12.00% of Ni, 18.00% to 20.00% of Cr, 0 to 0.50% of Mo, 0.06% to 0.12% of N, 0.05% to 0.30% of Nb, 0 to 0.018% of Co, 0-0.30% of one or more of the rare-earth elements Ce, Dy, Y and Nd, and Fe in balancing amount; the high temperature ferrite Delta in the austenitic stainless steel under cast condition is 1% to 3%. The welding wire can solve the problem that the mechanical property of a long-time running weld joint is insufficient in the environment of material pressurized water reactor. The welding wire provided by the invention is mainly applied to weld critical components in a pressurized water reactor nuclear island.

The invention belongs to the field of welding materials, and relates to a two-phase stainless steel welding electrode and a manufacturing method thereof, wherein coating components of the welding electrode comprise 10-15% of marble, 5-10% of potassium feldspar, 1-5% of aluminum oxide, 1-5% of synthetic mica, 2-4% of chrome oxide green, 1-2% of chromium nitride, 20-25% of metallic powder, 5-10% offluorite and 1-3% of sodium carbonate by mass, and a matrix is rutile. The manufacturing method includes the steps of weighing the coating with the components, adding in potassium type sodium silicate accounting for 20-22% of the total weight of the coating and having the baume degree of 43 degrees, evenly mixing, pressing through an oil press, and then roasting at the high temperature of 350 DEGC for two hours. The welding electrode is good in welding process, attractive in formed welding joints, good in slag detachability, and high in mechanical property and anti-corrosion property when the welding current is 160A and the voltage is 30-34V.