56results about How to "Improve weld structure" patented technology

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

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.

A laser and electric-resistance seam-welding synchronous composite welding method for an envelope-framework structure relates to a novel laser and electric-resistance seam-welding synchronous composite welding method, belongs to the welding field, and aims to solve the problems in welding the envelope-framework structure by the single laser, such as narrow seam, low shear strength of the seam, a plurality of air vents on the faying surface of the envelope and the framework. The invention aims at the workpiece with the envelope-framework structure to be welded, and adopts the laser and the electric-resistance seam-welding synchronous composite welding; the electric-resistance seam-welding adopts double-roller single-side welding, two roller electrodes are disposed on the front and the back sides of the upper top surface of the envelope along the seam formed by the contact of the envelope and the framework, so that the envelope is pressed to the lower framework in the travel forward, and the laser beam is always positioned in the middle position of the two roller electrodes during the welding process. The seam formed by the welding method can improve the shear strength more than twice in comparison with the base material, and the air vent amount per area can be reduced from about 10% to about 2% of the laser welding.

The invention relates to a processing technology for refining weld joint structures in a welding process, in particular to a method and a device for refining weld joint structures by using pulsed magnet fields in the welding process, and belongs to the technical field of welding. The method for refining weld joint structures by using pulsed magnet fields in the welding process includes that welding is performed by using an ordinary gas metal arc welding method, an applied magnetic field is added above a gas metal arc welding pool, mechanical movement and welding gun movement of the magnet fields are synchronous, electric arc and melt drip transition action is controlled by the magnet fields in a welding process, metal melt in the gas metal arc welding pool is forced to move, an electromagnetic stirring effect is produced, and weld joint structures are finally refined in the welding process. According to the method and the device, in the welding process, the weld joint structures are refined, welding defects are reduced, and further the cost is reduced, and the welding quality and the production efficiency are improved.

The invention discloses a high-performance seamless continuous pipe and a manufacturing method thereof. The method comprises the steps of preparing a continuous pipe dedicated board through processesof high-purity refining, continuous casting, thermal controlled rolling and controlled cooling, acid pickling and the like; preparing pipe blanks through rolled plate longitudinal shear, steel strip abut joint, cage-roll forming and high-frequency induction welding with protection gas; continuously producing equal-outer-diameter or variable-outer-diameter pipes through hot rolling reducing of thesame specification of pipe blanks; destressing the pipes to achieve the aims of reducing the pipe residual stress, improving the pipe toughness and reducing the pipe hardness, and obtaining the continuous pipe product with the good comprehensive property. The continuous pipe product meets the API standard need, through the hot rolling reducing technology, the pipe annular and longitudinal weldingjoint structure is obviously refined, and tends to be consistent with the base metal structure, physical seamlessness is achieved, the continuous pipe whole property can be effectively improved, the service life of the continuous pipe is prolonged, work safety of the continuous pipe is improved, the continuous pipe work technology advancing can be greatly pushed, and the market application prospect is wide.

A P110 steel level high frequency straight welded pipe manufacturing method comprises (1) taking hot-rolled coil as raw material; (2) shaping the coil into a straight seam pipe by continuous shaping techniques, welding the straight seam on the pipe by a high frequency inductive welding machine to produce a primary pipe, and after the welding, timely removing external and internal burrs of the primary pipe; (3) heating the primary pipe removed of burrs by a medium frequency induction furnace to 920-950 degrees centigrade and conveying it to a hot rolling and diameter reducing machine, rolling the primary pipe into pipe blanks with different apertures by hot mechanical rolling; (4) conducting whole-pipe quenching and tempering to the hot roller pipe blank to produce finished pipe; (5) conducting ultrasonic flaw detection and pipe end magnetic powder inspection to the finished pipe. The invention takes low steel level coil as raw material to produce primary pipe, produces pipe blanks with different diameter specifications by the primary pipe with the same specification, and produces oil casing product with high steel level and high performance by low steel level economical pipe blanks. The working efficiency is high. The production cost is low.

A welding process involves a fixture for holding a workpiece and a welder, or welding electrode. The fixture imposes ultrasonic vibration on the workpiece. The welder vibrates during vibration, and is operable at a first voltage for welding and a second voltage for peening. The peening may occur while the weld metal is crystallizing. The welding process may be a process of welding two parts together, or of filling a groove or other feature, or of applying or restoring a surface, or of applying a hard facing or ceramic to a parent metal or object. The weld metal may be the same, or substantially the same, as the parent metal, or it may be different. The different material may be a ceramic material.

The invention discloses a submerged-arc surfacing flux-cored wire and a technology for composite production and reproduction of continuous casting rollers. The deposited metals of the flux-cored wirecomprises components in percentage by weight as follows: 0.02%-0.3% of C, 0.8%-2.8% of Mn, 0.1%-1.0% of Si, 12.0%-15.0% of Cr, 0.3%-2.0% of Mo, 1.5%-5.0% of Ni, 0.01%-1.5% of rare-earth elements, 0-1.2% of V and Nb, 0-0.16% of N, less than 0.03% of S, less than 0.03% of P and the balance of Fe. The technology comprises steps as follows: (1) rollers are turned into the size before surfacing; (2) the rollers are detected before surfacing; (3) the surfacing technology is determined, and technological parameters are determined according to the surfacing technology; (4) single-layer surfacing forming is performed; (5) components, hardness and structures of different positions after surfacing are detected. The technology is good in technological property and has the high cost performance.

The invention discloses a laser welding method applicable to aluminum alloy. The method includes that technological parameters are used for the aluminum alloy, which include that the laser power is 2000-2400w, the welding speed is 0.8-1.2m/min, the off-focus value is (minus 0.5)-0.5 and the protective gas flow speed is 12-18L/min, and good weld joints are obtained. The aluminum alloy is 7000 series aluminum alloy, especially, 7000 series aluminum alloy for automobiles. The laser welding method applicable to the aluminum alloy has the advantages that the aluminum alloy, especially, the 7000 series aluminum alloy for the automobiles, which are processed by the method, can gain good weld joint structures, and weld porosity, structure boundaries and obvious coarse-grain zones are absent. The strength of a weld assembly is high.

The invention discloses an electric-arc ultrasonic seam-welding composite welding device. The electric-arc ultrasonic seam-welding composite welding device comprises an ultrasonic device and an electric-arc welding device, wherein the ultrasonic device comprises an ultrasonic seam-welding machine and an arc welding rolling wheel, the arc welding rolling wheel is connected with an output shaft of the ultrasonic seam-welding machine, and the ultrasonic seam-welding machine converts an ultrasonic wave to vibration and transfers the vibration onto the arc welding rolling wheel; and the electric-arc welding device comprises an electric-arc welding gun, the electric-arc welding gun is fixed together with the ultrasonic seam-welding machine, and the arc welding rolling wheel generates vibration for a workpiece to be welded to refine grains in a welding area while the electric-arc welding gun welds the workpiece to be welded. In this way, the arc welding rolling wheel rotates on an arc welding guide rail to generate high-frequency vibration for the welding area and co-acts with the electric-arc welding gun clamped on the ultrasonic seam-welding machine to refine the grains in the welding area while the ultrasonic seam-welding machine and the arc welding rolling wheel move along a flexible guide rail, thus weld structure and mechanical properties are improved, and the welding effect is improved.

The invention relates to an aluminum alloy TIG tracking method based on an ultrasonic electric arc. The aluminum alloy TIG tracking method is used for overcoming the defects that aluminum alloy TIG single-pass welding is small in weld penetration depth, low in welding efficiency and poor in manual welding weld seam quality. According to the method, a small-angle double-exposure holographic interference method is designed; by means of the method, influences of an oxide active agent, a chloride active agent, a fluoride active agent and a mixed active agent formed by the oxide active agent, the chloride active agent and the fluoride active agent on arc plasmas are confirmed, and the active agent with the best arc gathering effect is selected as an experiment material; the selected active agent is sprayed, and ultrasound is loaded in the coaxial direction of the TIG electric arc; after welding starts, the waveform of welding current is extracted, the envelope curve value of semiconservative filtering is designed, tracking is conducted, and feasibility of the method is verified through the small-angle double-exposure holographic interference method. The method has the beneficial effectthat ordinary ultrasound and electric arc compound welding is achieved, and the ultrasonic electric arc and the surface active agent are fused.

The invention discloses an electron beam welding method suitable for an injection-molded 7000-series aluminum alloy. In the method, electron beam welding is performed on the injection-molded 7000-series aluminum alloy by adopting the process parameters of welding current of 18-22mA, voltage of 70-75kV, welding speed of 280-320 mm/min and scanning frequency of 1.8-2.4Hz to obtain a good weld seam. The method has the advantages that: a good weld seam structure can be obtained for the injection-molded 7000-series aluminum alloy treated with the method, and no welding air hole, structural boundary line or remarkable coarse crystal strip exists. The intensity of a weld assembly can be enhanced by performing subsequent solid solution and aging treatment.

The invention discloses a rare earth solid welding wire with excellent low-temperature impact toughness. The rare earth solid welding wire comprises the following chemical components including, by mass, 0.06 to 0.10 percent of C, 1.40 to 1.55 percent of Mn, 0.80 to 0.95 percent of Si, 0.10 to 0.20 percent of Cr, 0.05 to 0.12 percent of Ti, 5 to 30 ppm of a rare earth element Ce and the balance Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.025 percent, and S in the impurities is less than or equal to 0.025 percent. The invention is suitable for 600 Mpa-level solid welding wires, the rare earth element Ce is transited into welding seams, and the welding seams have more excellent low-temperature-resistant impact toughness on the basis of high strength through the effects of refining welding seam grains, improving welding seam structures and purifying welding seam metal microalloying treatment.

The invention discloses a deposition and milling integrated double-station 3D printer. According to the deposition and milling integrated double-station 3D printer, firstly, a three-dimensional formed object to be printed is subjected to model treatment; in the treatment process, the forming process of the three-dimensional formed object is divided into two parts which are related in shape and different in function to conduct forming according to different principles; and according to the operation of dividing forming of the three-dimensional formed object into two parts which are related in shape and different in function to conduct forming according to different principles, a three-dimensional model is divided into an inner solid model, an inner contour model and an outer contour model, the inner solid model is subjected to additive forming through a fused deposition nozzle, the inner contour model and the outer contour model are subjected to subtractive forming through a milling module, and the fused deposition nozzle and the milling module are mounted on a multi-station lifting type switching tackle.

The invention provides a micro-vibration auxiliary laser lap welding method for aluminum-silicon coating hot forming steel. A laser welding process is adopted, auxiliary micro-vibration is used in the welding process, and a well-formed aluminum-silicon coating hot forming steel laser lap welding seam can be obtained. According to the method, laser process parameters are controlled, a mechanical vibration external field is applied on the basis, and vibration parameters are adjusted, so that the aggregation degree of an aluminum coating dissolved in the welding seam is effectively reduced, the structure of the welding seam is optimized, and welding defects are reduced, so that a high-quality lap welding joint is obtained, and the method is suitable for welding of the aluminum-silicon coating hot forming steel for automobiles; and compared with a traditional laser lap joint method, an aluminum-silicon coating on the surface of the hot forming steel does not need to be removed, the lap joint welding technological process is simplified, the production efficiency is improved, meanwhile, due to application of mechanical vibration, the aggregation degree of the aluminum coating in the welding seam is relieved, grains are refined, the residual stress of the joint is reduced, and the strength of the lap welding joint is improved.

The invention provides a novel double-beam laser composite laser powder filling welding method which comprises the following steps that 110, the welding purpose is obtained, and filling powder and protective gas are determined according to the type of a welding material and the welding requirement; 120, a preliminary test is performed, process parameters of the two beams of laser are preliminarilyset, an optimal liquid micro-forging area is determined by using a visual tracking system and a temperature sensing system, and the process parameters of the two beams of laser are optimized to update the process parameters; and 130, the novel double-beam laser composite laser powder filling welding is completed according to the related parameters optimized by the preliminary test. Under the action of micro-forging laser on a welding area in a molten state, the number of air holes in a weld joint is restrained, columnar crystals are converted into isometric crystals, the structure is finer, the morphology and the size of a primary phase and an eutectic structure are affected, the dendritic crystal arm distance is shortened, the chemical component nonuniformity of a molten pool area is reduced, and the weld joint structure and the mechanical property are improved.