442 results about "Submerged arc welding" patented technology

The invention discloses a pre-welding deviation rectifying device for a submerged-arc welding straight seam steel pipe, and relates to the technical field of steel pipe submerged-arc welding. The submerged-arc welding device comprises a machining table, a first linear sliding rail module and a second linear sliding rail module are installed at the top of the machining table, a submerged-arc welding assembly is installed on the second linear sliding rail module, a fixed plate is fixedly installed at the left end of the top of the machining table, a movable plate is installed on the first linear sliding rail module, and three-jaw chucks are installed on the movable plate and the fixed plate correspondingly. A three-jaw chuck drives an inner correction rod to expand outwards to conduct center positioning on a steel pipe, an inner circle can be corrected, then a guide disc is rotated to enable a connecting rod to enter an arc groove part of an inner correction guide groove to lock the position of the inner correction rod, and a swing rod drives an outer correction rod to swing through a telescopic rod. The outer correcting rods correct the outer circle of the steel pipe, the two sets of outer correcting rods are pressed on the two sides of a welding seam to clamp the welding seam, and therefore welding deformation caused by thermal expansion and contraction in the welding process is reduced.

The invention discloses a production method of a novel rare earth submerged arc welding wire steel wire rod for pipeline steel. The specific technological process is as follows. Blast furnace molten iron preparation, molten iron pretreatment, converter top and bottom combined blowing smelting, LF refining, VD vacuum treatment, small square billet continuous casting, steel billet heating, high-pressure water descaling, rough rolling, flying shearing, intermediate rolling, kick shearing, finish rolling, controlled cooling water tank, spinning, stelmor cooling, coil collecting, trimming, sampling inspection, collecting and bundling and weighing -a finished wire. According to the novel production method of the rare earth submerged arc welding wire steel wire rod for the pipeline steel, by adding rare earth elements and novel alloy elements, the comprehensive performance, including but not limited to the low-temperature toughness impact performance, strength, toughness, corrosion resistance and the like, of welding wire steel is improved. Meanwhile, the rare earth element and the nickel element are added, the smelting process is optimized, composition segregation and inclusions are reduced, the porosity is reduced, and the strength and toughness of the welding wire steel are improved.

The application discloses a submerged-arc welding straight seam steel pipe pre-welding deviation rectifying device and belongs to the field of steel pipe welding. The submerged-arc welding straight seam steel pipe pre-welding deviation rectifying device comprises supporting legs, the top of the supporting legs is fixedly connected with a working plate, the front end top of the working plate is fixedly installed with a first clamp, the rear end of the first clamp is provided with a second clamp, the right side top of the working plate is provided with a welder, the lower portion of the welder is provided with an alignment assembly, the alignment assembly comprises a supporting plate, the top of the supporting plate is fixedly connected with the bottom of the second clamp, the bottom of the supporting plate is fixedly connected with the top of a sliding block, and the bottom of the sliding block is slidingly connected in a limiting frame. Through the setting of the alignment assembly, the two ends of the pipeline can be centrally aligned when the welder welds the pipeline, and the welding result can be effectively prevented from being affected by the deviation problem during the welding of the steel pipe.

The invention belongs to the technical field of welding equipment, and relates to a panel moving type double-wire submerged arc welding machine and a welding method.The panel moving type double-wire submerged arc welding machine comprises a frame body, and a welding flux hopper, a wire feeder mounting frame and a mounting frame are sequentially mounted on the frame body from top to bottom; two groups of wire feeders are mounted on the wire feeder mounting frame, and the angles of the wire feeders can be adjusted so as to adjust the welding wire conveying angle; two welding guns are mounted on the mounting frame, a welding flux spreading joint is fixed on one of the welding guns, the feeding end of the welding flux spreading joint is hermetically connected with the discharging end of a welding flux hopper through a conveying pipe, and the positions and the angles of the welding guns can be adjusted; a recovery suction nozzle is installed on the installation frame and driven by a driving component to recover redundant welding flux. According to the welding structure, the operation time of a welding seam can be greatly shortened through double-wire welding, meanwhile, the angle of the wire feeder is adjustable, the wire feeding smoothness can be adjusted, and welding is more stable.

The invention relates to the field of tubular target welding positioning, in particular to a tubular target annular welding positioner which comprises a welding support, a tubular target support movably connected to the left side of the top of the welding support, a back plate support movably connected to the right side of the top of the welding support and linked with the welding support through a transmission mechanism, and a submerged arc welding gun support movably installed in the middle of the welding support. And the clamping mechanism is movably mounted at the upper part of the tubular target bracket and is used for clamping and positioning the tubular target. According to the annular welding positioner for the tubular target, the tubular target support, the clamping mechanism, the gap adjusting mechanism and other components are used in cooperation, when the tubular target is clamped through the clamping mechanism, a clamping rod on the clamping mechanism drives a positioning ring to move horizontally, and the positioning ring drives a limiting screw on the gap adjusting mechanism to move synchronously; the welding gap between the tubular target and the back plate on the tubular target support and the back plate support is adjusted and controlled, the welding gap between the tubular target and the back plate is automatically adjusted according to different thicknesses of the clamped tubular target, and the welding efficiency and the welding precision are improved.

The utility model relates to the technical field of steel pipe welding, in particular to a submerged arc welding machine for steel pipe straight seam welding, which comprises a steel pipe placing seat, a welding mechanism arranged on the rear side of the steel pipe placing seat, and a welding flux recovery mechanism comprising a recovery cover positioned on the upper side of the steel pipe placing seat. And a scraping plate for removing slag shells is fixed at the bottom of the inner wall of the recovery cover. A supporting plate in the welding mechanism drives a welding flux box, a welding gun and a welding flux recovery mechanism to move synchronously, slag shells formed by the welding flux are scraped in the moving process of a scraper, the procedure of independently cleaning the slag shells is omitted, the used welding flux is sucked into a recovery cover through a fan, then the used welding flux enters a processing box through a suction pipe, and the welding flux recovery efficiency is improved. Impurities in used welding flux are screened out through the filtering plate, the treated welding flux is pumped into the welding flux box through the discharging pipe by the conveying pump, synchronous circulating recycling of the welding flux is achieved, repeated conveying is avoided, and time is saved.

The application provides a multi-wire submerged arc welding method and device for straight-seam steel pipes, and belongs to the technical field of welding. The method comprises the following steps: adopting a multi-wire submerged arc welding process to perform double-sided submerged arc welding on a straight-seam steel pipe, and when welding an outer weld, an ultrasonic auxiliary device arranged at the back of a molten pool generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through a horn, so that the formation of intergranular ferrite in the weld zone is inhibited, the content of intragranular acicular ferrite is increased, and the toughness and hydrogen brittleness resistance of the weld zone are improved. The device comprises a three-wire submerged arc welding device, an ultrasonic auxiliary device and a telescopic cantilever beam; the ultrasonic auxiliary device is installed at the front end of the telescopic cantilever beam and comprises three ultrasonic transducers arranged side by side; a horn is installed at the output end of the ultrasonic transducer; the ultrasonic transducer generates ultrasonic waves and inputs the ultrasonic waves into the molten pool through the horn. The application solves the problems that the existing ultrasonic auxiliary arc welding cannot control the content of acicular ferrite and the effect of reducing residual stress in the weld zone is not obvious.

The invention relates to a preheating-free 690MPa-grade high-strength and high-toughness submerged-arc welding wire, a preparation method thereof and a submerged-arc welding process, and belongs to the technical field of welding materials. The welding wire comprises the following chemical components in percentage by mass: 0.07 to 0.10 percent of C; 0.25% to 0.50% of Si; mn: 1.20% to 1.50%; 0.20% to 0.50% of Cr; 2.10% to 3.30% of Ni; 0.45% to 0.65% of Mo; 0.03% to 0.05% of Ti; s < = 0.005%; p < = 0.005%; and the balance of Fe. By optimizing the content of C and the proportion of Ni and introducing Ti microalloying means and combining low-S and low-P control and hydrogen control processes, preheating-free welding of the 690 MPa-grade low-temperature high-strength steel under the normal-temperature or low-temperature condition is achieved, traditional preheating operation is avoided, energy consumption is reduced, and the process is simplified.

The invention relates to the technical field of H-shaped steel production processes, in particular to an H-shaped steel production process and a production line. Comprising a first assembling, welding and correcting all-in-one machine used for primarily welding H-shaped steel into T-shaped steel, a spot welding machine used for conducting spot welding on the T-shaped steel and a wing plate, an overturning machine used for overturning the H-shaped steel subjected to spot welding, and a second assembling, welding and correcting all-in-one machine used for conducting automatic submerged-arc welding on the formed H-shaped steel. Supporting bases are arranged at the welding output ends of the first assembling, welding and correcting all-in-one machine and the second assembling, welding and correcting all-in-one machine correspondingly and located below the wing plates. According to the H-shaped steel automatic submerged-arc welding device, by arranging a cut-off scraping plate, the cut-off scraping plate is matched with a sand suction shell assembly under the connection action of a matched moving mechanism, and therefore after automatic submerged-arc welding is conducted on H-shaped steel, generated welding sand strips can be cut off and then recycled, and then the effect of fully recycling the welding sand strips is achieved; strip-shaped welding sand strips are prevented from being accumulated on the outer side of the H-shaped steel, and the welding seam quality of the H-shaped steel is guaranteed.

The utility model belongs to the technical field of high-temperature gas cooled reactor equipment manufacturing, and discloses a saddle-shaped welding seam 3G position filament swing submerged arc welding tool, which utilizes a welding robot and a tool structure design to meet standards and design specifications and greatly improve welding efficiency. The problem that a traditional submerged-arc welding seam cannot be formed can be solved, and the welding efficiency is improved.

The invention discloses a pipe die submerged arc surfacing remanufacturing method and system capable of improving the thermal fatigue performance, and the method comprises the following steps: 1, pretreatment: removing thermal fatigue cracks, cracks and wear scratches on the inner wall of a pipe die by adopting a turning or boring process, the method comprises the following steps of (1) pre-treating a pipe die, (2) pre-heating at low temperature: pre-heating a to-be-welded part of the pre-treated pipe die by adopting a high-frequency induction heating module, (3) carrying out submerged arc surfacing, (4) carrying out subarea induction tempering treatment on the surfaced pipe die, firstly turning or boring all thermal fatigue cracks, cracks, abrasion scratches and high-temperature oxidation fatigue layers on the inner wall of the pipe die, and then carrying out tempering treatment on the pipe die. A low-temperature preheating welding wire formula is adopted, crack resistance is achieved under low heat input, a good structure is formed, curved surface self-adaptive welding is achieved, powder is automatically added in the welding process, welding slag is automatically cleaned, dotting is conducted after welding, stress is released, and longitudinal or transverse cracks are effectively avoided. And tempering the pipe die repaired by surfacing after welding, and carrying out ultrasonic scanning and residual stress testing.

The invention relates to the technical field of nondestructive detection of welding seams, in particular to an automatic ultrasonic phased array detection method for a submerged arc welding seam, which is mainly applied to the detection of the submerged arc welding seam of a long-distance pipeline. A multi-channel phased array detection technology is adopted to carry out partition scanning on a welding seam, simulated typical defects of different positions and areas in the welding seam of a standard sample pipe are utilized to calibrate and set parameters of a detection system, and dynamic verification is carried out to verify the coverage range of the detection system and the detection capability and repeatability of the detection system on a preset wall thickness. Simulated typical defects of the standard sample tube are reasonably arranged and serve as a detection system coverage range, a reference reflector with preset wall thickness detection capacity is adopted, and specific defect types and distribution meet standard regulations; the detection system adopts a specific TCG parameter setting and alarm gate setting method, the coverage range of a detection area on the width and thickness of the welding seam is ensured, the situation that echo reflected by a geometric structure of the welding seam enters the alarm gate to cause false alarm is avoided, and the detection reliability is improved.

The utility model provides a welding tool device for submerged-arc welding of an annular workpiece. The welding tool device comprises a rotating disc support, a rotating disc base, a supporting device, a rotating device and a submerged-arc welding machine supporting device. The rotating disc base supports the rotating disc support through the supporting device, the rotating disc support is used for supporting an annular workpiece, the rotating device is used for rotating the rotating disc support, and the submerged arc welding machine supporting device is located beside the rotating disc support and used for supporting an automatic submerged arc welding machine. And the automatic submerged-arc welding machine is used for performing submerged-arc welding on the annular workpiece rotating on the turntable bracket. According to the utility model, submerged-arc welding of the annular workpiece is realized, the workload of handle welding is reduced, the welding production efficiency of the workpiece is improved, and the first-pass yield of weld flaw detection of the annular workpiece is greatly improved.

The double-arc double-wire submerged arc welding device comprises a portal frame connecting piece, an arc welding support is arranged on one side of the portal frame connecting piece, a through hole is formed in the top of the arc welding support, wire feeding devices are symmetrically arranged on the top of the arc welding support, motors are arranged on the two sides of the pair of wire feeding devices, and the motors are arranged on the two sides of the pair of wire feeding devices. A welding gun fixing rod is assembled at the bottom of the arc welding support, a pair of welding gun clamping pieces is arranged on the welding gun fixing rod, and a first welding gun and a second welding gun are arranged on the pair of welding gun clamping pieces respectively. According to the device, double-arc welding can be achieved, the height and the included angle of the welding gun can be flexibly adjusted, and the welding penetration depth is accurately controlled. According to the device, while the welding efficiency and the welding quality are guaranteed, the personal error in the welding process can be reduced, the control capability on the welding penetration depth is remarkably improved, the personnel safety is guaranteed, and the overall use performance of equipment is improved.

The invention discloses double-sided longitudinal submerged arc welding steel pipe manufacturing equipment, and relates to the technical field of submerged arc welding equipment. The device comprises a base, two sets of supporting rollers are arranged at the top of the base, a mounting frame plate is fixedly mounted at the top of the base, a lower horizontal linear sliding rail module and a vertical linear sliding rail module are fixedly mounted on the outer side of the mounting frame plate, and an upper horizontal linear sliding rail module is mounted on the vertical linear sliding rail module; an upper submerged-arc welding assembly is mounted on the upper horizontal linear sliding rail module; an outer frame is mounted on the lower horizontal linear sliding rail module, and a lower submerged arc welding assembly is obliquely mounted in the outer frame. Through the arrangement of the welding flux lifting piece, the magnetic skirt edge can be automatically adsorbed on the inner wall of a steel pipe, the net bag can hold welding flux, the discharged welding flux can fall into the net bag in cooperation with the inclined design of the lower submerged-arc welding assembly, and through the cooperative use of the upper submerged-arc welding assembly, inner and outer double-face welding of a welding seam can be conducted at the same time.

The utility model relates to an auxiliary tool for submerged arc welding, which belongs to the field of welding tools and comprises a positioning column and a hydraulic cylinder, the positioning column is horizontally arranged, one end of the positioning column is in a circular truncated cone shape, the other end of the positioning column is connected with a piston end of the hydraulic cylinder, and the hydraulic cylinder is used for driving the positioning column to move along the length direction of the positioning column. A plurality of clamping jaws are arranged on the positioning column, distributed in the circumferential direction with the positioning column as the center and connected with a cylinder body of the hydraulic cylinder. The clamping jaw comprises a connecting rod, a rotating arm and a clamping block, the rotating arm is hinged to a cylinder body of the hydraulic cylinder through the connecting rod, and the connecting rod is obliquely arranged. The application range is expanded, and in addition, a connecting pipe fitting for assisting in lengthening does not need to be used, so that the operation convenience is improved.

The present application provides an arc welding method and an arc welding device, in submerged arc welding in which a molten pool is stabilized by periodically changing a welding current, even in a case where a droplet transfer mode cannot be a rotating jet transfer during a high current period, the stability of the submerged arc welding is improved. An arc is generated by supplying a welding current of 300 A or more to a welding wire, and a tip of the welding wire is welded to a base material in a space surrounded by a molten portion formed in the base material by the generated arc, in the arc welding method of the consumable electrode type, a current reduction period in which the welding current is reduced and a current increase period in which the welding current is increased are periodically repeated, and further, a pulse high current is additionally supplied when the current reduction period changes to the current increase period.

The utility model relates to the technical field of welding equipment, and discloses an adjustable submerged arc welding platform which comprises a bottom plate, supporting plates are arranged on the front side and the rear side of the upper surface of the bottom plate, adjusting units are arranged at the bottoms of the supporting plates, and a protection plate is fixedly connected to the surface of the side, away from the center of the bottom plate, of each supporting plate. An inclined plate is fixedly connected to the upper surface of the protection plate, supporting pulleys are fixedly connected to the left side and the right side of the bottom face of the supporting plate, and cleaning through grooves are formed in the left side and the right side of the upper surface of the bottom plate. According to the device, through cooperation of the supporting plate, the adjusting unit, the protection plate, the inclined plate, the supporting pulley and the cleaning through groove, the supporting position of a machined part can be adjusted according to the size of the machined part, the adaptability of the platform is improved, and sliding of welding slag and welding flux generated in the machining process can be guided; and the welding slag and the welding flux are prevented from accumulating on the bottom plate, so that the use of the adjusting unit is influenced and the cleaning is difficult.

The invention discloses a wind power generator rotor welding device and relates to the technical field of submerged arc welding, the wind power generator rotor welding device comprises a welding frame and an assembly tool, a welding groove is formed in the middle of the welding frame in a penetrating mode, and a submerged arc welding machine is slidably installed in the welding groove. According to the wind power generator rotor welding device, the first workpiece is adjusted to be in the optimal ship-shaped state through the roller carrier to be welded, and after the first submerged arc welding is completed, the second submerged arc welding is continuously carried out, so that the preheating temperature of a welding seam is maintained, meanwhile, the tempering treatment is carried out on the first welding seam, and a submerged arc welding machine is matched, so that the welding efficiency is improved. The heat input of each welding seam can be balanced, the situation that the positioning welding seam cracks frequently is prevented, the welding quality is effectively improved, and the welding efficiency is greatly improved.

The invention discloses an in-situ metallurgical submerged-arc welding method for hydrogen storage / transportation material bypass high-nickel cold wires, and relates to the field of submerged-arc welding. The problem that hydrogen embrittlement and hydrogen induced cracking are prone to occurring in a hydrogen conveying pipe welding joint is solved. The frame body is fixed to a sliding plate of a submerged arc welding gun, the wire feeding wheel set is installed on the frame body and inputs high-nickel cold wires into a stable area of a molten pool in a stepless speed change mode, the Hall sensor detects the wire feeding speed in real time and feeds back speed signals to the servo driver of the wire feeding wheel set, and therefore closed-loop control over the wire feeding speed is achieved. According to the submerged-arc welding method, in the welding process, the bypass high-nickel cold wire is introduced, quantitative regulation and control over the nickel element content in a weld joint and accurate control over heat input of the weld joint are achieved by adjusting the wire feeding speed of the bypass high-nickel cold wire, and then the hydrogen embrittlement resistance of the weld joint is improved. The method is used for hydrogen storage / transportation material welding.

A submerged-arc welding wire bidirectional paper tube winding machine comprises a pay-off machine, the pay-off machine provides a submerged-arc welding wire, and the submerged-arc welding wire enters a winding mechanism; the winding mechanism comprises a rack, an air cylinder is arranged on the rack, the bottom of a cylinder body of the air cylinder is hinged to the lower portion of a top plate of the rack through a shaft, an air cylinder rod of the air cylinder is hinged to the wire feeding mechanism through a shaft, and the bottom of the wire feeding mechanism is arranged on the top plate of the rack in a sliding mode. A kidney-shaped groove is machined in the wire feeding mechanism bottom plate, a guide roller is arranged on the rack, and the guide roller is matched with the kidney-shaped groove in the wire feeding mechanism bottom plate. A rotating disc is arranged on the machine frame and driven by a motor to rotate. By the adoption of the technical scheme, the wire feeding mechanism has the advantages that the wire feeding mechanism is newly designed, the position of the wire feeding mechanism can be changed, and the purpose of bidirectional winding of wires is achieved only by changing the position of the wire feeding mechanism and the rotating direction of the winding motor.

The application provides a numerical simulation method and device for a submerged arc welding molten pool, an electronic device and a storage medium. The method comprises the following steps: determining a welding slag heat flux density and an arc heat flux density model according to a welding voltage and a welding current; determining an arc pressure model according to a vacuum magnetic permeability and the welding current; determining an interface tension model according to slag-gold interface coefficient information and gas-gold interface coefficient information; determining a volume heat model of arc heat flux or a volume heat model of welding slag heat flux according to the welding slag heat flux density and the arc heat flux density model; determining a volume force model of arc pressure or a volume force model of interface tension according to the arc pressure model, the slag-gold interface tension model and the gas-gold interface tension model; and loading the volume heat model of arc heat flux, the volume heat model of welding slag heat flux, the volume force model of arc pressure and the volume force model of interface tension into a fluid simulation software to perform numerical simulation on the submerged arc welding molten pool. The application can accurately perform numerical simulation on the submerged arc welding molten pool.

The present application belongs to the technical field of spiral submerged arc welding pipe manufacturing, and particularly relates to a mechanical positioning and locking hydraulic device and system suitable for stable steel strip bevel milling, aiming to solve the problems of poor positioning precision and complex structure of the existing edge milling machine positioning device; the device comprises a main cylinder, a first brake cylinder and a second brake cylinder; the top of the main cylinder, the first brake cylinder and the second brake cylinder is provided with a connecting piece; the main cylinder comprises a main cylinder cylinder, a main cylinder piston and a main piston rod, and the main cylinder cylinder has a first chamber, a second chamber and a third chamber; the first brake cylinder comprises a first taper core structure, a first brake piston, a first brake cylinder end cover, a first gland and a first guide rod; the second brake cylinder comprises a second taper core structure, a second brake piston and a second guide rod, and the bottom and the top of the third chamber are respectively provided with a second brake cylinder end cover and a second gland; the scheme disclosed by the present application integrates the functions of extension, retraction and mechanical positioning and locking into one, has a simple structure and can realize accurate positioning.

The utility model relates to the technical field of large roller surfacing, in particular to a high-temperature-resistant submerged-arc welding gun device for large roller surfacing repair, which comprises a welding flux blanking hose, a welding flux blanking steel pipe, a wire feeding system, a conducting rod, a heat insulation mechanism, a heat preservation box, a blanking positioning mechanism, a three-way diverter, a contact tube and a contact tube protection sleeve, the heat insulation mechanism comprises a steel plate shell and heat insulation fire-resistant cotton, the steel plate shell is horizontally arranged between the heat preservation box cover and the wire feeding system, the heat insulation fire-resistant cotton is arranged on the side, facing the wire feeding system, of the steel plate shell, and the welding flux discharging positioning mechanism is arranged on the outer circumference of a conducting rod in the heat preservation box. The surfacing welding device has the advantages that the surfacing welding device can go deep into a high-temperature heat preservation furnace for surfacing welding, and the stability of welding bead forming in the surfacing welding process is improved.

The application discloses a welding method for improving low-temperature impact toughness of thick plates in a stress relief heat treatment state, which comprises the following steps: processing a groove; symmetrically processing an X-shaped groove on a welding section of a thick steel plate to be welded, wherein the X-shaped groove comprises a central flat part and two inclined parts symmetrically arranged on both sides of the central flat part in a thickness direction; pre-welding; controlling an assembly gap of the tailor-welded thick steel plate to be zero, and adopting tungsten argon arc welding to pre-weld a welding bead on both sides of the groove root of the upper and lower surfaces of the thick steel plate; and welding; adopting submerged-arc welding to weld and fill the groove on both sides of the upper and lower surfaces of the thick steel plate containing the pre-welding bead. The welding method for improving low-temperature impact toughness of thick plates in a stress relief heat treatment state can effectively improve the low-temperature impact toughness of the weld.

The application relates to a submerged arc welding machine head with visual tracking, which comprises a rack, a wire feeding mechanism, a welding torch and a roller arranged on the rack, a deformation detection mechanism arranged at the bottom of the rack, the deformation detection mechanism being used for detecting the position change of the roller caused by the deformation compression of a steel member; an active adjusting mechanism adjusts the position of the rack according to the detection result of the deformation detection mechanism; a laser visual adjusting mechanism is arranged on the rack, the welding torch is fixedly installed on the laser visual adjusting mechanism, the laser visual adjusting mechanism is used for identifying and acquiring the position deviation of a weld in real time and adjusting the position of the welding torch; the wire feeding mechanism is fixedly installed on the rack and located above the welding torch, and is used for straightening and feeding a welding wire to the welding torch for welding. The submerged arc welding machine head with visual tracking can track the deformation of the steel member and the weld in real time, automatically adjust and correct the position of the welding torch, improve the welding precision and consistency, and reduce the labor intensity.

The invention provides a bridge steel combined welding method. A groove is an asymmetric V-shaped double-faced groove. GMAW-Ar (argon-rich mixed gas shielded welding) and SAW (submerged arc welding automatic welding) combined welding is adopted, a solid welding wire, a submerged arc welding wire and a welding flux are selected, and welding is conducted in a multi-layer and multi-pass mode; an alloy system of chemical components of the submerged arc welding wire is Mn-Ni-Cr-Mo, rare earth elements are added in the formula, and high-purity deposited metal is obtained while grains are refined. By means of the method, welding of the ultrahigh-strength steel above the 890 MPa grade of the Q890qE bridge is achieved, the mechanical property of a welded joint is excellent, and the welding efficiency is high; the mechanical property index of a welded joint is higher than the required value RP0.2 > = 890, Rm > = 1000,-40 DEG C KV2 > = 54J, and A > = 12%; as the steel plate strength is improved, the bridge span is increased, and the number of piers is reduced; as the steel plate is thinned, the welding workload is reduced, and the preheating requirement is lowered; along with reduction of the weight of the bridge member, transportation and bridge site hoisting operation are more convenient.

The invention relates to the technical field of electric power iron tower accessory production, and provides an automatic welding device for electric power iron tower accessories. Supporting frames are installed on the two sides of the top end of the workbench, linear motors are installed at the top ends of the supporting frames, second air cylinders are installed at the bottom ends of the linear motors, and welding structures are arranged at the bottom ends of the second air cylinders. The welding structure comprises a welding base, the welding base is installed at the bottom end of the second air cylinder, and a rotating groove is formed in one side of the welding base. The gear ring can drive the laser welding head to rotate in the rotating process, so that the laser welding head can conduct rotary welding at the welding position of two sets of steel pipes, welding of the two sets of steel pipes is more convenient, and compared with traditional electric arc welding such as submerged arc welding and manual electric arc welding, the annular welding mode has the advantages that the welding efficiency is improved, and the welding quality is improved. And the characteristics of a steel pipe annular welding seam can be obviously adapted, and the requirements of full-circumference sealing and uniform stress are met, so that the welding work of the steel pipe is completed, and the welding effect is better.

The present application relates to the field of pipeline welding, and particularly relates to a method and system for improving the load bearing capacity of a weld based on pipe end reinforcement size optimization, which method comprises: girth welding a first pipeline and a second pipeline to be welded to form a girth welding area; using a finite element analysis method to calculate a pipe end reinforcement size corresponding to a minimum cost when performing submerged arc additive processing on the first pipeline and the second pipeline for the girth welding area; and performing submerged arc welding on the first pipeline to form a first submerged arc additive area and performing submerged arc welding on the second pipeline to form a second submerged arc additive area according to the pipe end reinforcement size. The present application increases the thickness and load bearing area of the girth welding area of the pipe end by means of submerged arc welding at the lowest cost, to achieve finishing of the pipe end, thereby avoiding stress and strain concentration at the girth welding area, and further achieving complete high strength matching of the girth welding area structure, and ultimately achieving the purposes of improving the load bearing capacity of the girth welding area and reducing the failure risk of the girth welding area.

The application discloses a thick plate welding method with good low-temperature impact toughness in a stress relief annealing state, which comprises the following steps: processing a groove; symmetrically processing an X-shaped groove on a welding section of a thick steel plate to be welded, the X-shaped groove comprising a central flat part and two inclined parts symmetrically arranged on both sides of the central flat part in a thickness direction; and welding; controlling an assembly gap of the tailor-welded thick steel plate to be zero, and adopting five-wire submerged arc welding to perform single-pass welding on upper and lower surfaces of the thick steel plate respectively. The welding method adopts high-efficiency five-wire submerged arc welding, and through reasonable setting of angles of welding guns and polarities of power sources, reasonable matching of welding materials and process parameter windows, cooperation of an optimized groove form and the process parameter window, and the like, low-temperature impact toughness of a weld after stress relief annealing heat treatment is avoided from greatly decreasing.