42results about How to "Improve welding processability" patented technology

The invention discloses a bright welding wire for heat-resistant steel for an ultra-supercritical coal-fired power station and belongs to the technical field of welding materials. The welding wire comprises, by weight, 0.10-0.15% of C, 8.5-9.0% of Cr, 0.1-0.6% of Ni, 0.3-0.6% of Mn, 2.5-3.0% of Co, 2.0-2.7% of W, 0.020-0.035% of Nb, 0.001-0.010% of Zr, less than or equal to 0.006% of N, 0.16-0.20%of V, 0.003-0.010% of B, less than or equal to 0.20% of Si, less than or equal to 0.006% of P, less than or equal to 0.006% of S, less than or equal to 0.010% of O, less than or equal to 0.03% of Al,less than or equal to 0.01% of Ti and the balance Fe and inevitable impurity elements. The bright welding wire has the advantages that the welding wire has good welding process performance and excellent deposited metal flowability and formability, and the deposited metal after welding has excellent mechanical properties and good room temperature impact toughness.

The invention discloses a control method and system for a pulse MIG (Metal-Inert Gas) welding electric arc. The method and the system disclosed by the invention has the advantages that the pilot-arc width or the pulse frequency of the pulse MIG electric arc is commonly controlled in a loop-opened feed-forward control mode of a welding-wire feeding speed signal and a loop-closed negative-feedback control mode of an electric arc length signal so as to maintain dynamic balance of the feeding speed and the fusion speed of welding wires and maintain constant electric arc length of the system and a constant jet transient mode of molten drops when welding current adjustment (by adjusting the wire-feeding speed), wire-feeding speed disturbance or arc length disturbance occurs. In addition, the invention also discloses a new process which adopts the method and the system and is used for controlling the fusion depth and the forming of welding seams by adopting a pulsating feeding mode for welding.

The invention relates to a method for connecting thick-walled metal workpieces by welding. In order to create the weld joint, the cross-sections are provided with a maximum of three weld regions according to wall thickness, the welding being carried out by a combined use of welding methods: the first weld region (root) is welded by means of laser beam welding or hybrid laser-arc welding, the second weld region is welded by means of hybrid laser-arc welding, and the third weld region required occasionally depending on the thickness of the sheet metal is welded by means of hybrid laser-arc welding or simply arc welding. The invention also relates to a seam preparation corresponding to the respective welding method used.

The invention discloses a welding electrode coating. The welding electrode coating comprises components of, by mass, 15-65 parts of attapulgite of medium-low grades, 0-10 parts of quartz sand, 15-20 parts of dolomite, 19-50 parts of magnesia and 1-5 parts of iron powder. According to the welding electrode coating, used attapulgite raw ore is rich in reserve and low in price and provides a stable raw material source for coating welding, and welding electrodes obtained on the basis are low in cost, stable in arc and small in spattering particle during welding, prone to slag removal after welding, smooth and attractive in formed weld joint, low in welding dust generating rate, safe and non-toxic, good in economic and environment benefit and broad in application prospect.

The invention relates to a seamless self-protection flux-cored wire for low-nitrogen non-magnetic naval vessel steel welding. According to the technical scheme, the seamless self-protection flux-coredwire is composed of 70 wt%-80 wt% of a stainless steel strip and 20 wt%-30 wt% of flux-cored powder, and the stainless steel strip is filled with the flux-cored powder. The stainless steel strip comprises the following chemical components of, in percentage by weight, 0.03-0.08 wt% of C, less than or equal to 1wt% of Si, less than or equal to 2 wt% of Mn, 18-20 wt% of Cr, 8-11 wt% of Ni, less thanor equal to 0.03 wt% of S, less than or equal to 0.03 wt% of P and the balance Fe and inevitable impurities. The flux-cored powder comprises the following chemical components of, in percentage by weight, 40-43 wt% of barium fluoride, 5-8 wt% of marble, 8-10 wt% of aluminum powder, 2-4 wt% of silicon powder, 7-10 wt% of manganese powder, 2-5 wt% of manganese nitride, 10-13 wt% of nickel powder, 5-7 wt% of chromium powder and the balance iron powder. According to the seamless self-protection flux-cored wire, weld metal formed by welding the low-nitrogen non-magnetic naval vessel steel is high in strength, good in ductility and toughness, non-magnetic and excellent in seawater corrosion resistance.

The invention provides a welding wire flux core, a welding wire, a preparation method of the welding wire and a welding method, and relates to the technical field of welding materials. The flux core is formed by following chemical components including, by mass percent, 1-6% of Mn, 0.1-5% of Si, 0.1-2% of Mg, 35-50% of Cr, 15-25% of Ni; 1-10% of Na2O and K2O, 0.1-2% of fluoride, 15-30% of TiO2, 3-10% of SiO2 and the balance Fe and inevitable impurities. After the welding wire is adopted for surfacing, the tensile strength of a surfacing layer of the welding wire is 527-547 MPa, the elongation is 38%, the welding wire is used as a backing welding material of an alloy steel flux-cored wire for surface surfacing, it is guaranteed that no open cracks exist in side bending (d=4t, and alpha=180 degrees) after heat preservation of 690 DEG C and heat treatment of 32 hours, and surfacing layer metal has no intergranular corrosion tendency; the welding process performance is good, electric arcs are stable, splashing is small, weld joint forming is attractive, and vertical downward welding can be achieved through short-circuit transition; and the welding wire is simple in production process, reasonable in alloy system design and low in comprehensive cost.

The invention discloses a high-wear-resistance flux-cored electrode and a preparation method thereof. The electrode comprises a pipe body, a flux core and a coating; the pipe body is filled with the flux core; the coating wraps the pipe body; the flux core is prepared from the components including tungsten carbide and boron carbide, and the weight ratio of the tungsten carbide to the boron carbidein the flux core is 1:1; and the coating is prepared from the components including, by weight, 40.0%-45.0% of tungsten carbide, 3.0%-7.0% of graphite powder, 21.0%-26.0% of chromium equivalent, 13.0%-21.0% of high-potassium feldspar powder and 1.0%-23.0% of nominal iron powder. According to the electrode, the problems that powder leaks from the end of a welding arc, a pipe coating and a coating become red, a flux core is prone to oxidation or serious sintering and the like can be avoided, meanwhile, the relatively high stripping resistance, welding process and economical efficiency are achieved, the coating and the pipe core are resistant to reddening, the porosity resistance, the stripping resistance, the cost performance and the like are superior to those of existing similar electrodesor gas welding tubular tungsten carbide rods, the welding seam metal hardness is high, and the wear resistance is excellent.

The invention relates to a gas metal arc welding flux-cored wire used for ultralow-temperature high-manganese steel. According to the technical scheme, the gas metal arc welding flux-cored wire used for the ultralow-temperature high-manganese steel is composed of 65-70 wt% of a steel strip and 30-35 wt% of flux core powder; the steel strip comprises the following chemical components: 0.10-0.20 wt% of C, 0.01-0.05 wt% of Si, 3-7 wt% of Mn, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S, and the balance Fe and inevitable impurities; and the flux core powder comprises the following chemical components: 28-34 wt% of rutile, 2-4 wt% of zircon sand, 2-4 wt% of potassium titanate, 20-25 wt% of electrolytic manganese, 8-15 wt% of nickel powder, 8-12 wt% of high-carbon ferro-chrome, and the balance iron powder. According to the gas metal arc welding flux-cored wire used for the ultralow-temperature high-manganese steel, all-position welding can be achieved, and the welding efficiency is high; and formed weld metal is good in forming, low in pore sensitivity and excellent in low-temperature toughness, and the strength matches that of the ultralow-temperature high-manganese steel.

The invention discloses a welding method for gas shielded welding of an aluminium-alloy vehicle body. The welding method comprises the following specific steps of: in welding, spraying a layer of pasty welding agent on an assembled welding seam base material in advance, wherein the pasty welding agent is 10-15mm in width and 50-200mum in thickness; when the welding agent entering a low-temperature area at the periphery of the temperature field of the arc reaches the melting temperature (560 DEG C) along with the movement of welding arc along the direction of a welding seam, immediately melting the welding agent into a liquid film, quickly wetting the surface of the base material, removing an oxidation film on the surface of the base material, and then covering the surface of the base material and the surface of metal in a molten pool. The welding method disclosed by the invention has the advantages that the welding process can be finished only by using the heat inputted in arc welding to melt the base material with the melting point of being 570-640 DEG C and welding wires as electrodes; aluminium-alloy MIG gas shielded welding connection of the high-strength vehicle body can be realized only by inputting low heat, the process is excellent, and the performance of joints is stable and good.

The invention discloses a frame assembly of an all-terrain vehicle. The rear of a main reducing gear which is provided with a lug, and a rocker part which is provided with a lug and towing are combined into a whole through a bottom tube rear composition board, and the towing, a rear rocker and the main reducing gear are mounted, positioned and combined into a sheet metal component as possible; and simultaneously, an air filter provided with a lug is arranged on the front of a frame, and an oil tank mounting plate is arranged on the rear of the frame, so that an oil tank is positioned on the rear of the frame and the air filter is positioned on the front of the frame. The frame assembly has compact structure, optimized spacial arrangement, light weight and more reasonable mass distribution of a whole vehicle, improves welding manufacturability and reduces welding frock to reduce manufacturing cost, and well guarantees strength and rigidity of the whole vehicle through reinforcing members.

The invention provides a high-strength and high-toughness submerged arc horizontal welding agent and a preparing method and application thereof. The high-strength and high-toughness submerged arc horizontal welding agent comprises welding agent powder and a bonding agent. The welding agent powder comprises following components including, by weight, 20-25 parts of magnesium oxide, 9-15 parts of calcium oxide, 25-30 parts of aluminum oxide, 15-20 parts of barium fluoride, 5-10 parts of electrolytic manganese metal, 8-12 parts of silicon mud and 1.5-2.5 parts of nickel powder. According to the high-strength and high-toughness submerged arc horizontal welding agent, the submerged arc welding agent is adopted, the deposited metal tensile strength reaches 620 MPa, the low-temperature ballistic work is high, the high-strength and high-toughness submerged arc horizontal welding agent is specially used for horizontal welding, deslagging is easy, forming is attractive, and the welding quality can be guaranteed.

The invention discloses a method for adjusting working current of a lithium electric welding machine. The method comprises the following steps of 1, sampling welding voltage and current and sampling power supply voltage and current of a lithium battery; 2, according to a current-limiting/boundary current formula Iout = Ubat * Ibatmax * eta/Uf, calculating and judging an electric arc welding stateof the welding machine in a working process, and dynamically adjusting a welding current; and 3, outputting the adjusted welding current. Peak discharge and continuous discharge performance of a lithium battery system are fully utilized, a current-limiting/boundary current formula Iout = Ubat * Ibatmax * eta/Uf is suitable for a normal welding state, a short-circuit state and a long-arc state in the welding process, the welding current of a welding machine is not limited to a traditional cross-flow design mode, and the output current in a wider range can be obtained, so that the welding process performance is improved, the welding operation efficiency is improved, and the endurance is increased.

The invention provides a low hydrogen type electrode and a preparation method thereof. The low hydrogen type electrode comprises a coating and a core wire. The core wire is a low-alloy steel. The coating is prepared from, by weight ratio, 5-15 parts of organic cellulose, 5-20 parts of rare earth fluoride, 10-20 parts of TiO2, 6-15 parts of iron powder, 3-6 parts of Al2O3, 2-4 parts of manganese, 0.5-3 parts of copper powder, 12-20 parts of CaF2, 10-30 parts of fluorite, 2-5 parts of Mo and 0.5-5 parts of graphite. The invention further discloses a preparation method of the low hydrogen type electrode. The low hydrogen type electrode is good in spreadability, small in splashed particles, excellent in fire resistant performance and good in technological operation performance.

The invention discloses a B-pillar upper end connector structure. The B-pillar upper end connector structure comprises a cantrail inner panel, a body side outer panel, a B-pillar inner panel and a B-pillar reinforced panel. The upper portion of the B-pillar inner panel is fixedly connected with the cantrail inner panel, the body side outer panel, the cantrail inner panel and the B-pillar reinforced panel are fixedly connected, the body side outer panel, the B-pillar inner panel, and the B-pillar reinforced panel are fixedly connected, the B-pillar inner panel is in the shape of an I, the position of the cantrail inner panel, which is separately fixed onto the B-pillar inner panel, is provided with an outwards-protruding stepped surface, an arc-shaped transition section is arranged between the stepped surface and the cantrail inner panel, and the upper portion of the B-pillar inner panel is fixedly connected with the stepped surface. The B-pillar upper end connector structure is simple, the fillet portion of the B-pillar upper end can avoid four-layer welding, the manufacturability of welding can be improved, gaps can be avoided, the stress value can be reduced, stress concentration can be avoided, costs can be reduced, and performance can be improved.