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

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.

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.