62results about How to "Refine the weld grain" patented technology

The invention provides a novel process for a formula of a slag-free flux-cored wire, and relates to a welding material. The manufacturing method adds the combination of molybdenum powder, nickel powder and rare earth silicon to a formula of raw materials, eliminates mineral powder in a common formula, and optimizes the proportion of various types of metal powder in the formula. According to the formula, the welding material comprises the following components: 4 to 8 parts of micro carbon ferrochromium, 12 to 18 parts of low carbon ferromanganese, 56 to 67 parts of iron powder, 2 to 6 parts of molybdenum powder, 0.1 to 0.4 part of ferroboron, 2 to 5 parts of rare earth silicon, 1 to 3 parts of ferrosilicon, 2 to 3 parts of ferrotitanium, 2 to 3 parts of sodium fluoride, 3 to 7 parts of ferroaluminum, 1 to 3 parts of aluminum to magnesium powder and 4 to 8 parts of nickel powder. The invention improves the toughness, strength and anti-fatigue performance of welding seams and thins welding-seam grains by adding the combination of molybdenum powder, nickel powder and rare earth silicon into the raw materials of the formula, eliminating the mineral powder in the common formula, and optimizing the proportion of various types of metal powder in the formula. Meanwhile, slagging on the surfaces of the welding seams is avoided, and welding efficiency is raised by 20 percent compared with slag-type processes.

The invention discloses a welding method of a laser-ultra-small current GMA composite heat source; the welding method can solve the technical problem of large deformation when a metal thin plate is welded; the invention mainly comprises the following steps; in composite heat source welding, the adopted average current of a GMA arc (5) is 15A to 30A; when the steel material is welded, the power of the laser (1) is more than 800W, and when the aluminium alloy is welded, the power of the laser (1) is more than 1,600W; a laser beam (1) is at the front and the GMA arc is at the back; and the distance of chevilled silk is 0mm to 3mm and the two molten pools are connected together. The welding method is applicable to the welding of thin metal plates with the thickness to be 0.5mm to 4mm such as aluminium alloy, carbon steel, low alloy and more than two dissimilar metals.

A thermo-mechanical treatment process can change welding seam structure property, which comprises heating up welding seam fast and evenly over phase inversion temperature through adopting medium-frequency induction heating way, rolling the welding seam rapidly under the temperature, refining butt-jointed seam grain under the effects of rolling force and temperature, thereby improving welding seam property, and reaching the basic uniform with base metal. The invention refines welding seam grain through heating and rolling welding seam according to certain technique conditions, eliminates residual stress of welding seam, increases ductibility and toughness of welding seam, and improves structure property of welding seam, thereby welding seam grain size number is improved to about 12 grades from the original zero grade which is approximate with the base metal, and welding seam obtains basic uniformed structure and mechanics property with the base metal.

The invention provides a double-physical-field-assisted single-face laminated metal composite plate manufacturing method. The method includes the following steps that the surface of a base metal plate is cleaned through an acid pickling method, grease, stains and oxidation films are removed, and drying is conducted; the base metal plate is preheated under the atmospheric conditions or nitrogen or argon protection condition, the preheating temperature ranges from 150 DEG C to 1700 DEG C; rolling is conducted on the base metal plate or a base metal plate of preset low-melting-point filling materials through an inner-cooling type water cooling roller, meanwhile, ultrasonic waves and magnetic fields are applied continuously till a single-face laminated metal composite plate is manufactured. The double-physical-field-assisted single-face laminated metal composite plate manufacturing method has the advantages that the ultrasonic waves and the magnetic fields are applied, control over the interface reaction and intensifying of mass transfer process are facilitated, a composite welding seam for intensifying intermetallic compound particles is obtained, welding seam grain is refined, residual stress is lowered, the oxidation films are broken effectively, consumption of brazing flux is lowered or avoided, the toxic and side effect on staff and adverse effects on combined interfaces are reduced, energy saving is facilitated, and the environmental pollution is lowered.

A multi-physical-field auxiliary dissimilar metal material welding method comprises the following steps of (1) removing dirt on to-be-welded surfaces of two different metal materials, cleaning and preheating after drying; (2) heating through an external heating source under the atmospheric environment, or nitrogen or argon atmosphere to enable a base metal or filling materials at a joint position to be melted into liquid metal, meanwhile applying double physical fields of ultrasonic waves and a magnetic field and obtaining a composite welding seam after the liquid metal at the joint position is cooled and solidified; (3) obtaining a particle reinforced welding seam after the liquid metal at the welding seam is solidified and cooled to be in the indoor temperature. The multi-physical-field auxiliary dissimilar metal material welding method has the advantages of effectively controlling interface reaction and intensifying flowing of the liquid metal by applying the ultrasonic waves and the magnetic field, obtaining the composite welding seam with intermetallic compound particles being enhanced, being beneficial to integral combination of a welded joint, improving mechanical property of the welded joint, refining welding seam crystal particles, reducing residual stress, reducing toxic and side effects to persons and harmful effects to an aluminum steel bonding interface from brazing flux and being beneficial to environmental protection.

The invention discloses a high-frequency laser pulse method applied to dissimilar metal composite heat source welding. Through high-frequency pulse laser beam intervention, disturbance force in a molten pool can be increased, the Marangoni convection effect is enhanced, heat and mass transfer in the molten pool is accelerated, and uniform distribution of elements in the molten pool is achieved; aweld joint is shaped by directly or indirectly intervening a weld seam pool through a high-frequency pulse laser beam, weld seam grains can be refined, and a flat joint morphology which is symmetrically distributed along the center line of a weld seam is obtained; deformation maladjustment caused by difference of thermophysical performance parameters of dissimilar metal materials can be made up, so that the effect of intervening weldments in different time scales and space scales is achieved, and the reliability of dissimilar metal weld seam joints is improved; and the phenomenon of stress concentration induced by asymmetric distribution of pore and microcrack defects can be effectively prevented, and then the comprehensive mechanical property of the dissimilar metal weld seam joints is improved.

The invention belongs to the field of welding processes and discloses an ultrasonic arc laminating and rolling thin-wall steel tube welding device and welding method. The device comprises an ultrasonic arc generating device and a rolling and laminating device. An upper rolling and laminating wheel (5.1) is laminated to the outer wall surface of the thin-walled steel tube with zero clearance, and the radian curvature of the upper rolling and laminating wheel (5.1) is matched with the diameter of the outer side of the thin-walled steel tube; a lower rolling and laminating wheel (5.2) is laminated to the inner wall surface of the thin-walled steel tube with zero clearance, and the radian curvature of the lower rolling and laminating wheel (5.2) is matched with the diameter of the inner side of the thin-walled steel tube; and the upper rolling and laminating wheel (5.1) and the lower rolling and laminating wheel (5.2) correspond in position. The ultrasonic arc generating device introducesultrasonic arcs into a weld pool. The upper and lower rolling and laminating wheels are laminated to the steel tube in a rolling manner without zero clearance, so that grains of a weld joint of the steel tube are refined, the ductility of the weld joint is improved, and the tearing tendency in a follow-up drawing process is reduced.

The invention relates to steel for a high-frequency electric resistance welding petroleum casing pipe used under a hydrogen sulfide environment. The steel comprises the following components in percentage by mass: 0.15 to 0.35 percent of C, 0.1 to 0.6 percent of Si, 0.3 to 1 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.1 to 0.5 percent of Mo, 0.03 to 0.2 percent of V, 0.01 to 0.05 percent of Nb, 0.01 to 0.05 percent of Ti, 0.01 to 0.08 percent of Al, 0.0005 to 0.005 percent of Ca, 0.001 to 0.003 percent of B, and the balance of Fe and inevitable impurities; and the carbon equivalent is less than or equal to 0.43. The provided steel for the petroleum casing pipe can be used for manufacturing the high-frequency electric resistance welding petroleum casing pipe of 80ksi steel level with good sulfide stress corrosion cracking resistance and can be applied to a CO2 gas protection welding process, and the subsequent production efficiency of the high-frequency electric resistance welding petroleum casing pipe is improved.

The invention discloses an aluminum-copper alloy grounding material welding wire and a preparation method thereof. The aluminum-copper alloy grounding material welding wire comprises, by mass, 1%-3% of silicon, 1%-3% of copper, 0-0.3% of iron, 0.001%-0.05% of zirconium, 0.001%-0.5% of rare earth, and the balance aluminum. The aluminum-copper alloy grounding material welding wire can achieve welding of an aluminum-copper alloy grounding material, the structure of a weld zone is fine, the components are similar to those of parent metal, the potential difference is small, and the soil corrosion resistance is good.

The invention discloses a plating aluminium welding wire for a carbon dioxide arc welding and a preparation method thereof; a magnesium titanium alloy layer is plated on the surface of the welding wire by a hot-dipping method. As the surface plating layer of the prepared welding wire contains metal elements such as aluminium, magnesium, titanium and the like, the welding wire can reduce splash and increases the welding quality in the premise of ensuring the electrical conductivity; in the preparation method, the hot-dipping method is adopted for cladding material and can avoid the pollution brought by about the traditional coppering technique.

The invention relates to a high-corrosion resistance aluminum alloy filter and a process thereof. The filter is used for seawater desalination in environments like a ship and an offshore drilling platform. The high-corrosion resistance aluminum alloy filter comprises a shell composed by a barrel and a top cover, wherein the top cover is an aluminum-magnesium-silicon alloy cast part and at least comprises an upper liquid inlet branch pipe, a round head and bolt pressing plates uniformly distributed around the round head, the barrel is a series-5 aluminum-magnesium alloy barrel, a barrel flange is arranged at an interconnecting part of the barrel and the top cover, the barrel flange is a low pressure precision cast part and is provided with a lower liquid inlet branch pipe, the circumference of the flange is provided with bolt fixing plates arranged relative to the bolt pressing plates, an O-shaped ring recess is arranged on a contact surface of the barrel flange and the top cover, the lower liquid inlet branch pipe is in butt joint with the upper liquid inlet branch pipe, the bolt pressing plates are in fixed connection with the bolt fixing plates. The invention also relates to a process for the high-corrosion resistance aluminum alloy filter. According to the invention, the filter provided by the invention can be used in a seawater corrosion environment, and production efficiency is improved by 2 to 3 times.

The invention discloses brazing filler metal for 6 series aluminum alloy low-temperature vacuum brazing and a preparation method thereof, and relates to the technical field of aluminum alloy welding brazing filler metal preparation. The brazing filler metal is formed by smelting the following raw materials including, by mass, 6-7% of aluminum, 23-24% of tin, 9-10% of gallium, 7-8% of cobalt, 39-40% of bismuth, 12-13% of magnesium, and 4-5% of silicon. The brazing filler metal is formed by melting the multiple components, has good spreadability and plasticity and can be effectively matched with6 series aluminum alloy.

The invention discloses a trapezoidal wave modulation welding current waveform which is used for controlling welding current. Welding current waveform is in periodical cycle; within each welding current waveform period, the welding current waveform comprises a strong pulse packet, a strong-weak transition pulse packet, a weak pulse packet and a weak-strong transition pulse packet, which are sequentially connected to form a continuous modulation waveform. In the waveform, number of pulses in the strong-weak transition pulse packet is the same as the number of pulse in the weak-strong transition pulse packet; peak current values of all high-frequency rectangular pulses are the same; and peak current lasting time of all high-frequency rectangular pulses is the same. Base current and number of pulses in the weak pulse packet in the waveform are smaller than the base current and the number of pulses in the strong pulse packet, but the base value lasting time of the weak pulse packet in the waveform is greater than the base value lasting time of the strong pulse packet. The trapezoidal wave modulation welding current waveform can form attractive welding waves, and has a plurality of advantages of being very wide in current regulating range, reducing a pore occurrence rate and refining welding seam grains.

A double-shaft-shoulder friction stir welding stirring head with four sets of auxiliary devices comprises an auxiliary pull rope, a traction device, an auxiliary current heating device, a fixed pulley, an auxiliary multi-degree-of-freedom robot with a welding seam tracking device and a flexible coupler. With the four sets of auxiliary devices, the stress condition of the stirring head can be greatly improved, the service life of the stirring head is prolonged, and the welding length of the stirring head is increased. A slope is additionally arranged on an introduction plate, so that the reduction of the pre-tightening force between the two shaft shoulders after the pre-tightening force encounters softened metal in the working process is not reduced, and tunnel type welding defects can be reduced. Notches are formed in the corners and the positions with different thicknesses, so that the double-shaft-shoulder friction stir welding stirring head is particularly suitable for friction stir welding of plane and space curve butt welds, linear butt welds and segmented part transverse butt welds of medium-thickness steel parts and steel parts which are slightly staggered in height and are equal in thickness such as various ships, various warships including aircraft carriers, conventional submarines, nuclear submarines, deep diving submersibles, large cylinders, large platforms, large flat plates and large transporters. The invention also provides a corresponding welding method.

The invention discloses a TC4 titanium alloy metal powder core flux-cored welding strip and a preparation method thereof. The invention belongs to the technical field of welding material preparation. The titanium alloy solid welding strip aims at solving the technical problems that components of an existing titanium alloy solid welding strip for titanium alloy strip electrode submerged arc surfacing are not easy to regulate and control, and a surfacing cladding layer is difficult to meet comprehensive performance indexes such as strength, plasticity, toughness, abrasion resistance and corrosion resistance. The welding strip is composed of a Ti-9Mo-3Nb-3V titanium alloy skin and a metal powder core filled in the Ti-9Mo-3Nb-3V titanium alloy skin. The metal powder core is formed by mixing, by mass, 5%-7% of vanadium powder, 12%-17% of aluminum powder, 3%-5% of molybdenum powder, 3%-5% of iron powder, 1%-3% of silicon powder, 5%-8% of nickel powder and the balance titanium powder. By adding beneficial elements and supplementing burning elements in the welding process, the production cost is greatly reduced, the production efficiency is improved, a surfacing cladding layer has the advantages of being high in strength, good in plasticity and toughness and resistant to abrasion and corrosion, welding flux is not needed for molten pool protection and metallurgical regulation, and slag removal treatment is not needed after surfacing.

Provided is a mixed active agent for activing flux tungsten inert gas arc welding of a magnesium alloy. A method comprises the following steps that (1), the mixed active agent is formed by mixing MnCl2 with ZnO, wherein the mixed active agent comprises, by weight percentage, 65%-75% of MnCl2 and 25%-35% of ZnO; (2), according to a use method of the active agent, MnCl2 and ZnO active agent powder is fully ground, after even mixing, an appropriate amount of acetone is evenly added, and the mixture is made into a paste; (3), the upper surface of a sample is evenly coated with the pasty active agent with a flat hairbrush, the coating width is about 40 mm, and the average coating amount of the active agent is 6 mg.cm<-2>; (4), TIG is conducted after acetone is volatilized; and (5), after welding is completed, the morphology and the microstructure of a welding joint and a molten bath are observed, and representation of the mechanical property is conducted.

The invention discloses an ultrahigh-power laser-deep penetration TIG composite welding method for a thick plate, and belongs to the technical field of thick plate ultra-high power laser welding. The problems that in an existing ultrahigh-power laser welding process of the thick plate, welding spatter and collapse are serious, so that the welding seam surface forming control difficulty is large, and the stability of the ultrahigh-power laser-traditional TIG composite welding process of the thick plate is poor are solved. According to the method, an ultra-high power laser is emitted into a deep penetration TIG electric arc key hole, an opening area of the ultra-high power laser key hole is forcibly enlarged by means of the high stiffness and the high penetrating power of a deep penetration TIG electric arc, meanwhile, a metal liquid column at an opening of the laser key hole is restrained from flying out of the surface of a molten pool, the purposes of restraining ultrahigh power laser welding splashing of the thick plate and improving the welding quality are achieved, the welding seam upper surface forming is improved, and the welding process stability is improved.

The invention provides an aluminum alloy plate and a preparation method. The preparation method of the aluminum alloy plate comprises the steps that a first 5000-series aluminum alloy mother plate and a second 5000-series aluminum alloy mother plate are welded through a laser stirring welding technology to obtain the aluminum alloy plate, wherein the surface of the first 5000-series aluminum alloy mother plate and the surface of the second 5000-series aluminum alloy mother plate each comprise a Ti/Zr film. According to the preparation method, the first 5000-series aluminum alloy mother plate and the second 5000-series aluminum alloy mother plate do not need to be specially cleaned before welding, additional filling of welding wires are not needed, the preparation cost is saved, and the aluminum alloy plate which is high in welding strength, equal to a base metal in strength and free of welding defects can be obtained.

The invention belongs to the technical field of plating machining, and particularly relates to a titanizing technology method for the surface of an aluminum welding wire. A cotton thread containing titanium is wound on the surface of the aluminum welding wire, an assistant is dripped on the aluminum welding wire so that the assistant can be attached to the surface, with the cotton thread containing titanium, of the aluminum welding wire, after the cotton thread is completely pulled away from the aluminum welding wire and the assistant on the surface of the welding wire is completely volatized, the processed aluminum welding wire is polished, and the aluminum welding wire with the surface wrapped by titanium is obtained. According to the technology, titanium is evenly attached to the surface of the welding wire, pits and other unfavorable surface conditions generated in the pull-draw process can be comprehensively avoided, welding spatter is smaller during welding, weld joint grains can be refined through a trace of titanium, bubbles are avoided, the quality of a weld joint is improved, and the mechanical performance of the aluminum welding wire is improved.