32results about How to "Improve weld toughness" patented technology

The invention discloses a hot rolling wire rod for a 60 kg-stage high-strength welding wire and a production method thereof. The hot rolling wire rod comprises the following chemical components including, by mass, 0.06% to 0.12% of C, 0.40% to 0.80% of Si, 1.50% to 2.00% of Mn, 0.020% or less of P, 0.020% or less of S, 0.040% to 0.060% of V, 0.050% to 0.090% of Ti, 0.20% to 0.45% of Cr and the balance Fe and unavoidable impurities. The production method comprises steel making, continuous casting, heating, rolling, spinning and cooling procedures. According to the hot rolling wire rod for the 60 kg-stage high-strength welding wire and the production method thereof, the hot rolling wire rod for high-strength welding is produced through vanadium and titanium alloying, microstructures of equiaxial ferrite and pearlite are obtainedin cooperation with control over the finish rolling temperature, spinning temperature, cooling temperature and winding temperature, the hot rolling wire rod is processed into a gas shielded welding rod, the deposited metal tensile strength is 600 MPa to 700 MPa, and the wire rod is low in cost and good in performance stability.

The invention relates to a welding method for the Q460 high-strength steel tube of an extra-high-voltage power transmission steel tube tower, and the welding method comprises the following steps of: using a low-alloy high-strength steel plate having a yield strength of 460 MPa level, grinding the both sides of the low-alloy high-strength steel plate into single-surface grooves, bending the low-alloy high-strength steel plate into a primarily-formed steel tube with longitudinal slits, performing backing welding on welding joints, welding by means of CO2 gas shielded welding, and using JM68 welding wires; and continuously welding by means of submerged arc automatic welding during filling and covering, using CHW-S9 submerged arc welding wires, and using an SJ101 flux. According to the invention, aiming problems in welding for the Q460 high-strength steel tube, the CO2 gas shielded welding is combined with selection for the JM68 welding wires and reasonable welding parameters, and the CO2 gas shielded welding is combined with welding using the CHW-S9 welding wires and the SJ101 flux, thus improving the toughness and the quality of the welding joints, and increasing production efficiency and promoting the large-scale production simultaneously.

The invention discloses a low-temperature-resistant hot-rolled H-shaped steel and a preparation method thereof. The hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.07-0.10% of C, 0.2-0.4% of Si, 1.30-1.60% of Mn, at most 0.020% of P, at most 0.015% of S, 0.015-0.070% of V, 0.010-0.030% of Ti, and the balance of Fe and inevitable impurities. The production method comprises the following steps: converter smelting, LF (ladle furnace) refining, continuous casting, rolling and the like. The structure of the H-shaped steel is a polygonal ferrite and pearlite structure, the yield strength is 350-450 MPa, the tensile strength is 480-600 MPa, the percentage elongation after fracture is greater than or equal to 22%, and the -40-DEG C V-notch Charpy impact energy is greater than or equal to 200J.

The invention discloses a P92 steel submerged arc welding wire, which contains the following chemical components in percentage by mass: 0.06 to 0.08% of C, not less than 0.40% of Si, 0.4-1.0% of Mn, not less than 0.015% of P, not less than 0.015% of S, 9.0 to 10% of Cr, 0.3 to 0.6% of Mo, 0.15 to 0.25% of V, 1.5 to 2.0% of W, not less than 0.6% of Ni, 0.03 to 0.07% of Nb, 0.8 to 1.0% of Co, 0.001to 0.05% of B, 0.03 to 0.07% of N, and the balance of Fe. The welding wire is used in the submerged arc welding, on the premise of guaranteeing high temperature performance of a welding joint, the toughness of a weld seam is increased, and the application of a highly efficient welding method of the submerged arc in the boiler production is ensured.

The invention provides a welding wire for laser butt welding of Al-Si coated plates formed by hot-stamping and a butt welding method. The welding wire comprises no more than 0.30% of C, 1.0%-1.5% of Mn, no more than 0.005% of S, no more than 0.010% of P, 0.030-0.050% of Als, no more than 0.001% of Si, 5.0%-9.0% of Ni, 0.21%-0.50% of Cr, 0.010%-0.020% of Nb, 0.010%-0.020% of Ti, no more than 0.0030% of N, and the balance Fe and inevitable impurities. The butt welding method comprises the steps that two Al-Si coated plates are fixed through a welding clamp, wherein a gap is reserved between thetwo Al-Si coated plates; the diameter of the welding wire is determined according to the size of the gap; laser butt welding is conducted; and then, hot-stamping formation is conducted. By the adoption of the welding wire, pretreatment of a coating is not needed; and the laser butt welding method is simple, and the performance of welds is better than that of parent metal.

The invention relates to a welding method for 12Cr5Mo martensite stainless steel. The welding method comprises the following steps: step I, preparing a 12Cr5Mo martensite stainless steel groove, carrying out butt-joint assembly on the groove, and pre-heating a welded part of the groove at a pre-heating temperature being 100-150 DEG C; and step II, separately carrying out a primary welding process, a secondary welding process and a tertiary welding process on the welded part of the groove by use of a welding rod, wherein the welding rod is composed of a welding core and a coating; and the welding core consists of the following raw materials: C, Ni, Cr, Mn, Si, Ti, Nb, V, Ta, Zr, La, Ce, Pr, W, N and Fe. The coating consist of the following components: rutile, titanium dioxide, potassium feldspar, mica, calcium carbonate, nitrogen containing ferrochromium, electrolytic manganese, metal nickel, ferrocolumbium, magnesium oxide, yttrium oxide, sodium fluosilicate, hydroxypropyl methyl cellulose, phenolic resin and melamine. According to the welding method, a welding process is simple, welding seam molding is beautiful, slag is easily separated and deposition efficiency is high; and the obtained welding seam metal has excellent mechanical performance and mechanical property.

The invention relates to a welding technology of P92 steel submerged automatic arc welding for a power station boiler. According to a specific method, welding wires are selected, wherein the content of C is 0.06-0.08wt%, the content of Co is 0.9-2.0wt%, the contents of other elements are the same as that of a base material, and the diameters of the welding wires are 2.4mm; the specific welding method comprises the following steps: firstly preheating; beginning to weld until the temperature is 200-250 DEG C by preheating, wherein the welding speed is constantly kept to be 13-22 m/h, and the interlayer temperature is controlled to be 300-350 DEG C; stopping welding when the temperature is over 350 DEG C, and going on welding when the temperature is reduced to be lower than 350 DEG C and not lower than 200 DEG C. Therefore, the welding technology has the advantages that the crack sensitivity of weld joints is reduced and the formation of delta-ferrites is inhibited by selecting a low-carbon Co-alloying welding material, so that the tenacity of the weld joints is improved. According to the technology, the upper limit of the interlayer temperature can be promoted to be 350 DEG C, and thus the welding efficiency is greatly improved.

The invention belongs to the technical field of welding rod preparation, and discloses a heat-resistant steel hand welding rod for ultra-supercritical CB2 steel and a preparation method thereof. The heat-resistant steel hand welding rod is composed of a special H08Cr9MoV alloy core wire (produced by Jiangsu Yonggang Group Co., Ltd.) with low content of impurities such as phosphorus and sulfur and a coating wrapping the surface of the special H08Cr9MoV alloy core wire. The main components of cladding metal are 9% of Cr, 1.5% of Mo, 1% of Co, 1% of Ni and 0.2% of V, and meanwhile, trace alloy elements such as Nb, N and B are added, so that the weld joint deposited metal has good mechanical properties, especially impact energy performance after heat treatment, and the impact energy is larger than or equal to 47J in a normal temperature state. The tensile strength of the deposited metal and a welding joint is 630-750MPa under the heat treatment condition of 730-740 DEG C and time of 12h. According to the hand welding rod manufactured by the method, electric arcs are stable in the welding process, splashing is small, welding slag is uniform in covering, slag removal is good, weld joint forming is attractive, all-position welding can be carried out, and the welding process performance is good.

The invention discloses alloy powder used for improving flexibility of dual-phase steel laser welding joints and an application method of the alloy powder. The application method includes pouring absolute ethyl alcohol into an evaporating dish, weighing 13.5-14.5% of ferrous alloy powder, 82.5-83.5% of ferrous powder, 1-1.5% of aluminum powder, 0.8-1.2% of vanadium powder and 0.8-1.2% of cerium oxide into the evaporating dish, and stirring uniformly to prepare sticky alloy powder liquid; cleaning abutted surfaces of a workpiece to be welded, uniformly coating the sticky alloy powder liquid on the abutted surfaces and the peripheral area, and then performing laser welding. The alloy powder is simple to prepare, low in energy consumption and easy to popularize, and elongation rate of welding joint breakage is increased to 4.28% from 2.40%.

The invention belongs to the technical field of surfacing materials, and particularly relates to a preparation method of a surfacing alloy flux-cored wire. An alloy is prepared from the following components in percentage by mass: 0.2-0.6% of carbon, 0.4-0.8% of silicon iron, 26-30% of chromium carbide, 1-3% of magnetite, 0.2-1.0% of sodium fluoride, 0.2-1.5% of potassium titanate, 0.1-0.22% of nickel, 0.8-1.8% of manganese, and the balance of iron, and after burdening and smelting, the surfacing alloy flux-cored wire is prepared through technologies such as electroslag remelting, cogging, annealing, pickling, coping and cold drawing. The surfacing alloy flux-cored wire has good wear performance and red hardness, and peeling of a surfacing layer can be prevented.

The invention belongs to the technical field of surfacing materials, and particularly relates to a surfacing alloy flux-cored wire. The surfacing alloy flux-cored wire comprises the following chemicalcomposition of, in percentage by weight, 0.2% to 0.6% of carbon, 0.4% to 0.8% of ferrosilicon, 26% to 30% of chromium carbide, 1% to 3% of magnetite, 0.2% to 1.0% of sodium fluoride, 0.2% to 1.5% ofpotassium titanate, 0.1% to 0.22% of nickel, 0.8% to 1.8% of manganese and the balance iron, and has good wear performance and red hardness, and can prevent peeling of a surfacing layer.