85results about How to "Eliminate welding residual stress" patented technology

The invention discloses a method for welding a thick aluminum alloy plate. The method comprises the following steps of: blanking from a large aluminum plate according to a specified size: butting two opposite edges to be welded and forming two U-shaped welding grooves on the upper surface and the lower surface of the thick aluminum alloy plate; washing an aluminum alloy and a welding wire with acetone, removing oxidation films on the surfaces of the U-shaped welding grooves, and wiping; and welding the U-shaped welding grooves by using an inverted consumable electrode argon arc welding machine of which the maximum output current is 500 A, welding, annealing, and performing relief annealing in a subsequent further machining process. In the method, preheating is not required before welding, so that the labor intensity is effectively lowered, the mechanical property of a welding joint is improved, the internal quality of a weld seam of a thick aluminum plate is improved, and the welding strength is required to be over 90 percent of parent substrate strength.

The invention discloses a domestic 08Ni3DR steel thin multi-pass welding process, which is characterized by comprising the following steps of: machining a welding part into a single V-shaped or symmetrical double V-shaped groove, employing thin layer multi-pass welding, wherein on each layer, the weld pass thickness is less than 3mm, the diameter of a welding wire is 3.2mm, the welding current is 350 to 380A, the welding voltage is 34 to 38V and the welding speed is 36 to 45cm per minute, and controlling the interlayer and inter-pass temperature to be less than or equal to 150 DEG C; and performing dehydrogenation treatment and overall stress relief heat treatment after welding, and manufacturing a pressure container with the temperature level of 100 DEG C below zero such as main low temperature methanol wash equipment H2S and a CO2 absorption tower by employing the process, wherein the impact work kv2 of the welding joint of the equipment at the temperature of 101 DEG C below zero is more than or equal to 47J, and the mean value of the technical index and physical level is higher than American society of mechanical engineers (ASME) standard technical index.

The invention discloses a high-strength thick-wall welded steel pipe for a deep sea pipeline and a production method thereof. The steel pipe plate contains the following components in percentage by mass: 0.03-0.07% of C, 0.10-0.40% of Si, 1.20-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.10-0.35% of Ni, 0.10-0.35% of Cr, less than or equal to 0.35% of Cu, 0.10-0.35% of Mo, 0.01-0.06% of Nb, 0.01-0.06% of V, 0.005-0.025% of Ti, 0.01-0.06% of Al, 0.0020-0.0060% of N, 0.0005-0.0035% of Ca, 1.5-4.0% of Ti/N and the balance of Fe and inevitable impurities. The steel pipe disclosed by the invention has high plasticity and corrosion resistance and can be used for conveying the deep sea oil gas in a complicated working condition of deep sea service.

The invention discloses a surfacing method for an antiseptic wear-resisting layer of a dovetail groove. According to the method, two dovetail groove workpieces are spot-welded back to back, slant groove surfaces and horizontal groove surfaces of the upper dovetail groove workpiece and the lower dovetail groove workpiece are alternately skip-welded sectionally at intervals by ER410NiMoTi surfacing material, welding residual stress is eliminated through heat treatment, and finally the two dovetail groove workpieces are separated, corrected and roughly machined. According to the surfacing method disclosed by the invention, welding deformation can be effectively avoided, and the formed surfacing layer can improve the antiseptic wear-resisting performance of the dovetail groove.

The invention belongs to the field of metal material processing, and especially relates to a mould repairing stress automatic eliminating system and a method. The mould repairing stress automatic eliminating system comprises a control unit, a mould hammering parameter integration module, a computer simulation processing module, and a hammering repairing module; and the mould hammering parameter integration module, the computer simulation processing module, and the hammering repairing module are all connected with the control unit via electric connection. The mould repairing stress automatic eliminating system is capable of realizing automatic hammering of moulds so as to reduce welding residual stress.

The invention discloses a welding method of a super-thick steel casting. Process steps include S1, preparing a joint: an asymmetric X-type groove is adopted; S2, preheating: the front side and the reverse side are uniformly heated, the preheating temperature is set within the range of 150-160 DEG C, and the heating rate does not exceed 100 DEG C / h; S3, back welding: gas shielded welding backingis carried out on flux-cored welding wires for three layers, and fire warming is carried out to remove stress after each weld seam is welded; S4, reverse side air gouging: air gouging back chipping and carburized layer removal are carried out; S5, reverse side back welding: back welding is carried out by three layers after the temperature of the steel casting reaches a preheating temperature according to the method described in the step 2, and fire warming is performed on each weld seam to remove stress; S6, filling and cover surface welding: the front side and the reverse side are welded respectively by one welder simultaneously and symmetrically, and hammering is carried out layer by layer after each layer of weld beads of each weld seam is welded; and S7, 550 DEG C *2h heat treatment after stress removal is carried out immediately after the completion of welding. By means of the method, welding stress and welding deformation can be significantly reduced, and the probability of generating steel casting welding cracks is greatly reduced.

The invention relates to a moderate-strength aluminum liquid cooled shell welding method. The method comprises the following steps: step S1, machining welding parts; step S2, pre-treating the parts; step S3, welding, wherein the distance from a seal weld to the inner wall of a liquid cooling flow channel is W1; the fusion depth D1 of the electron beam EB1 weld is equal to the summation of the thickness D of a cover plate, the thickness d of a solder material and (3-4)mm; a surface focus is adopted for welding; the scanning amplitude value of the electron beams is 0.2mm to 0.4mm; a finished weld adopts defocusing welding; the fusion depth D2 of the finished electron beam EB2 weld is 2mm to 4mm; the appearance condition of the electron beam weld is checked after welding; step S4, performing vacuum braze welding treatment; step S5, machining the shell after welding until a final product is obtained. The method disclosed by the invention has the advantages of realizing reliable welding of an embedded cover plate and a chamber body by adopting a reasonable joint design and electron beam welding and vacuum braze welding techniques, and greatly improve the maturity of a preparation technique of a liquid cooling project.

The invention provides a large steel welded vertical oil tank. The large steel welded vertical oil tank is provided with a tank bottom, a tank wall and a tank top. A transition connecting ring is arranged between the tank bottom and the tank wall and provided with an annular bottom section, an arc-shaped transition section and a vertical cylindrical section. The tank bottom is connected with the annular bottom section of the transition connecting ring in a welded mode. The tank wall is connected with the vertical cylindrical section of the transition connecting ring in a welded mode. The tank top can be a fixed top and can also be an outwards-floating top. The large steel welded vertical oil tank has the advantages that T-shaped joints of a tank wall and a tank bottom of an existing large oil tank and large fillet welds on the joints are omitted, main danger points of the whole oil tank are eliminated, and safe operation of the large oil tank is guaranteed, wherein the transition position between the tank wall and the tank bottom is not prone to low-cycle fatigue damage, an attachment weld of the transition portion between the tank wall and the tank bottom is not prone to tearing damage, the anti-seismic property of the large oil tank is greatly improved, and the anti-seismic property of the large oil tank is good.

The invention relates to a method for guaranteeing the uniformity of heat treatment of a large-diameter thick-wall pipe weld. The method comprises the following steps: heating the pipe cavity of a pipe located at a weld position when heating the outer wall of the pipe located at the weld position, and then heating the inner wall of the pipe. Through the heat treatment process for simultaneously heating the inner wall and the outer wall, the temperature difference between the inner wall and the outer wall of the large-diameter thick-wall pipe weld can be reduced; the purpose of eliminating thewelding residual stress through heat treatment and improving the welding joint performance can be fulfilled; the problem about the poor heat treatment of the inner wall of the pipe can be solved; thepurpose of the uniform heat treatment of the weld can be integrally fulfilled; and especially, the heat treatment effect on a thick-wall pipe weld can be more obvious. The method is obvious, simple and economical; and furthermore, the method is strong in real-time performance and easy to operate on site.

The invention discloses a method for removing welding residual stresses. The method includes the following steps that first, a temperature distribution field of welding parts is calculated at first, and the distribution and dimensions of the welding residual stresses around a welded joint are calculated according to the temperature distribution field; and second, the external force and moment of force are applied to the welding parts beside a welded splice, and plastic deformation of the welding parts is caused so that the welding residual stresses calculated in the first step can be removed.By adoption of the method, the residual stresses of the welding parts can be effectively removed, and the problems of stress corrosion cracking and high-temperature fatigue cracking of the welding parts are solved.

The invention relates to a welding technique of a back suspension fork of an automobile; a reinforced plate is connected with a dragging arm; the invention is characterized in that the head part of a welding line is welded with a smooth arc and then is transited to the bottom side of the dragging arm; the welding technique of the invention has the advantages of removing the heat treatment after the welding and eliminating welding residual stress of the welding joint of the reinforced plate, thereby simplifying the technique during manufacture, being easy to control the quality, improving the fatigue strength of a product and reducing the manufacturing cost.

A method for eliminating the residual welding stress in the low-temp. compressive strain includes such steps as quickly heating the welded position within a limited region (width of 50-200 mm) to 200-400 deg.C for generating compressive plastic strain under the action of cold neighbouring region, resulting in the original compressive stress in the heated region also to produce the plastic compressive strain and after cooling, the residual stress in the welded joint produces radistribution. Its advantages are high effect and easy operation.

The invention relates to a cooling fan for a traction converter of a high-speed electric locomotive. The cooling fan comprises a rectangular box body (5), wherein a clapboard (11) is arranged at the middle of the box body (5) to divide the box body (5) into two independent cavities, a motor (7) is installed at rear side of each cavity, and an air inlet (9) and an air outlet (8) are respectively arranged at the front side and the lower side of each cavity. The cooling fan is characterized in that the rear side of each cavity is connected with the front end of the motor (7), an impeller (4) is arranged in each cavity and is coaxially installed on the output shaft of the motor (7), and two impellers (4) rotate counterclockwise during working so as not to mutually intervene. The cooling fan provided by the invention is mainly used for cooling the traction converters of motor trains with speed per hour of more than 380 km/h, and can satisfy the requirements of resisting low-temperature impact and high-speed vibration.

The invention discloses an anti-fatigue orthotropic plate structure and a manufacturing process. Design and manufacturing processes of a traditional orthotropic plate are changed and optimized. The process comprises the following steps that 1, a transverse partition plate with a certain height is welded when a panel and a longitudinal stiffening rib are welded to form an orthotropic plate, and overall rigidity of the plate is improved; 2, the longitudinal stiffening rib adopts a variable cross-section structure with a thickened end portion to increase welding strength with a bridge deck slab;3, a rib inner transverse partition plate is additionally arranged in the position, corresponding to the transverse partition plate, of the longitudinal stiffening rib, so that anti-torsion performance of the longitudinal stiffening rib is increased, and welding seam cracking of arc-shaped notches of the longitudinal stiffening rib and the transverse partition plate is eliminated; and 4, a weldedplate structure is subjected to integral annealing heat treatment, and welding residual stress generated by a large quantity of welding among the steel panel, the longitudinal stiffening rib and the transverse partition plate (beam) are eliminated. By means of comprehensive measures above, overall anti-fatigue performance of the orthotropic plate structure is greatly improved, the century difficulty of orthotropic welding seam fatigue cracking is solved, and service lives of the steel panel and a bridge are prolonged.

The invention provides a laser-pulsed magnetism-based welded-pipe welding residual stress relieving method. The laser-pulsed magnetism-based welded-pipe welding residual stress relieving method comprises laser splitting treatment and pulsed magnetism treatment and concretely comprises the following steps of 1, laser treatment: by a spectroscope, carrying out splitting on an original laser beam emitted by a laser, treating the laser beams by a first grating to obtain a central beam, a beam a, b and a beam c, d, and controlling spot sizes and positions of the three beams by a reflector and a second grating, and 2, pulsed magnetism treatment: carrying out pulsed discharging by different types of magnetizers of a pulsed discharging device to obtain a strong pulsed magnet field, and carrying out pulsed magnetism treatment on a welded-pipe welding line by outputting pulsed magnetism having pulsed magnetism treatment parameters by a magnetic read to carry out scanning treatment on the welding line. The method provided by the invention utilizes combination of laser treatment and pulsed magnetism treatment. The laser treatment aims at thermal stress and the pulsed magnetism treatment aims at structural stress and thus surface treatment can be realized by the laser treatment and the inner treatment can be realized by the pulsed magnetism treatment.

The invention belongs to the technical field of aluminum alloy welding and relates to a correcting process for the post welding distortion of friction stir welding. For a raised surface of a weld seamof an aluminum alloy profile to be welded, a stir-welding head without a stirring pin is used to perform "similar friction stir welding" on the weld seam; according to the raising degree of a bulge near each weld bead, the parameters, a revolution speed at 700-1,200 r/min and a feed speed at 1,300-1,800 mm/min, are adopted for re-stirring on the weld bead, so as to apply the effects of force andheat onto the product evenly; according to the distortion formed in the previous friction stir welding, a "reverse distortion" is applied in the same way to achieve a correcting effect, so as to allowthe amount of the distortion formed in the friction stir welding to be less than 3 mm and reduce the angular warping distortion of the weld seam; and the welded profile meets the requirement of product weld seam flatness.

The invention discloses a Hastelloy alloy composite material welding and heat treatment process method in modular production, which is used for welding Hastelloy alloy composite materials in modular production, and can be suitable for welding annular welding seams and longitudinal welding seams. The method comprises the following steps: firstly, welding a groove of a base layer base metal to form a base layer welding seam, then, back chipping and polishing, then, carrying out back cover welding, welding two transition layers, and carrying out stress relief heat treatment, so that the welding stress during welding of a hastelloy covering layer base metal can be reduced, and finally, welding a groove of the covering layer base metal to form a covering layer welding seam. According to the welding and heat treatment process, the strength and toughness of the base layer material are met, the strong internal stress generated by hastelloy deposited metal of the coating base material on the base layer base material, especially the bonding surface base material, is eliminated, and the product welding seam quality is stable and reliable.

The invention discloses a device for eliminating welding residual stress based on electromagnetic energy. The device includes a power supply system, an electromagnetism generator system and a coolingsystem, wherein the electromagnetism generator system includes a plurality of electromagnetic generators, and each electromagnetic generator includes a coil and a U-shaped iron core; the U-shaped ironcore is wound with the coil, and all the cores are connected with the power supply system; the cooling system is used for cooling the electromagnetism generator system; the electromagnetism generatorsystem is positioned right above a welding plate to be treated; and the treatment time for eliminating the welding residual stress is defined according to the length of the welding plate to be treated and amount of the U-shaped iron cores. According to the invention, energy for eliminating the welding residual stress is provided, joint microstructures cannot be affected, and corresponding performance of the joint is improved; stress relief is carried out instantly along with welding equipment, and can be carried out after welding is completed, so that high adaptation is realized.

The invention discloses a welding process method suitable for a large-section medium-thickness plate box column. The same large-section medium-thickness plate box column is subjected to segment-by-segment welding by work shifts, a construction segment is reasonably divided, assembly construction is organized, before the whole-section welding line is closed, inner stress generated by welding is gradually released, in combination with after-welding heat treatment measures, welding residual stress is greatly reduced, the welding process method can effectively release welding stress at proper time, defects of cracks and the like generated by welding can be prevented, the welding quality is improved, the one-time yield of welding quality can be improved, the construction period is shortened, and cost is control is benefited.

The invention provides a method for plasma surfacing of cobalt-based alloy in an inner hole of a cylinder. The method comprises the following steps that the pretreated cylinder is preheated to 350-450 DEG C; under the condition that the preheating temperature is kept, a layer of cobalt-based alloy is subjected to plasma surfacing on the inner hole of the cylinder to form a first surfacing layer; after slow cooling to the room temperature, the surfacing surface of the first surfacing layer is machined till the unilateral thickness is 1.6 mm-2mm; then the cylinder is preheated to 380 DEG C to 450 DEG C; under the condition that the preheating temperature is kept, a layer of cobalt-based alloy is subjected to plasma surfacing on the first surfacing layer to form a second surfacing layer; after the barrel is slowly cooled to the room temperature, the barrel is subjected to postweld treatment at the temperature of 410-430 DEG C; and the surfacing surface of the second surfacing layer is machined till the single-side thickness is 1.4 mm-1. 5 mm. According to the method for plasma surfacing of the cobalt-based alloy on the inner hole of the cylinder, the problem that cracks are prone to being generated in the surfacing process of the cobalt-based alloy on the inner hole of the cylinder made of austenite stainless steel can be solved.

The invention relates to the technical field of fan production, in particular to a fan welding process. The fan welding process comprises the following process steps of S1, butt welding of a machine shell; S2, oil pipe welding, specifically, S21, rough machining; S22, segmented welding; S3, weld inspection; S4, kerosene penetration test; S5, heat treatment, wherein a jacking oil pipe, an oil return pipe and a threading pipe are made of 304 stainless steel, a fan casing is made of Q345C, heat treatment is conducted on the fan casing, the jacking oil pipe, the oil return pipe and the threading pipe according to the heat treatment requirements of the 304 stainless steel and the Q345C, the fan casing, the jacking oil pipe, the oil return pipe and the threading pipe are heated to 400-500 DEG C, and heat preservation time is 24 hours; S6, hydraulic pressure test; and S7, paint spraying. By means of the compiled fan welding process, the welding residual stress of the weld position of the fan casing and the weld position of the oil pipe can be eliminated, the connecting performance of the fan casing and the oil pipe is improved, then the overall performance of the fan casing is enhanced, and the service life of the fan casing is prolonged.

The invention provides a welding method for an impeller locking bolt and a locking pin. The welding method comprises the following steps that an isolation layer with the same material as the locking pin is overlaid on the to-be-welded portion of the impeller locking bolt and the locking pin; postweld heat treatment is carried out on the impeller locking bolt after overlaying of the isolation layer; and the isolation layer of the impeller locking bolt is welded to the locking pin. The welding method for the impeller locking bolt and the locking pin can solve the problem that when the impeller locking bolt made of martensitic stainless steel and the locking pin made of nickel-based alloy are welded, chemical components and metallographic structures of a welded joint are uneven due to the fact that the physical performance and the mechanical performance of parent metal of the impeller locking bolt and the locking pin are greatly different, and therefore, the impact toughness of the jointis reduced.