727 results about "Submerged arc welding" patented technology

A forming device for a longitudinal submerged arc welded steel pipe. The forming device comprises a welding flux box body (1) and a welding head (2). A movement module (7) is movably connected to the middle end of an inner cavity of the welding flux box body (1). A power module (10) is movably connected to the interior of the middle end of the movement module (7). A movable module (6) is hinged to each of upper and lower ends on two sides of the power module (10), and a push plate (5) engaged with the movable modules (6) is movably connected to the middle of an inner cavity of the power module (10). A communication module (3) is fixedly connected on each of two ends at the bottom of the movement module (7), and each of the upper ends of the two communication modules (3) abuts and is connected to a closing module (4) slidably connected to the top of the welding flux box body (1). A blowing module (9) is fixedly connected on each of two sides of the push plate (5) located at the top end of the interior of the power module (10). An air outlet (11) is provided at each of the lower ends on two sides of the power module (10), and the interior of the air outlet (11) is connected to the blowing module (9). A pulling module (8) is movably connected to the interior of the movement module (7), and the top of the pulling module (8) abuts and is connected to the bottom of the push plate (5). The forming device enables layered processing of welding flux material, preventing partial adhesion of the flux material.

The invention discloses a welding method for heterogeneous multi-wire in-situ metallurgy of a submerged arc pipe of a hydrogen conveying pipeline, and aims to solve the problem of hydrogen-induced failure caused by the problems of coarse weld structure, secondary phase particle aggregation, low-temperature impact toughness and the like caused by a traditional multi-wire submerged arc welding method. The welding method comprises the steps that firstly, the to-be-welded face of the hydrogen conveying pipeline is polished and cleaned; and secondly, the cleaned hydrogen conveying pipeline to be welded is welded through three-wire submerged arc welding, H08MnMoTiB is adopted as a first welding wire, BH60GX-III is adopted as a second welding wire, H08Mn2NiA is adopted as a third welding wire, the components of the three welding wires are optimized, and the technological parameters such as the wire feeding speed, the current and the voltage of the three welding wires are optimized and adjusted. According to the method, the idea of in-situ metallurgy and multi-wire submerged arc welding are fused, the alloy component proportion of transition metal of a welding pool is achieved by changing the wire feeding speed of different welding wires, and different welding process parameters are supplemented, so that quantitative adjustment of the cladding metallurgy performance of a welding seam is achieved, and the hydrogen-induced corrosion resistance is improved.

The invention provides a method for obtaining the optimal low-temperature impact toughness and a welded body, and the method comprises the following steps: S1, obtaining chemical components of sample steel, and calculating the cooling rate corresponding to the bainite phase change curve nose tip temperature of the sample steel; s2, the cooling rate serves as the key cooling rate of the welding heat cycle process, and the corresponding welding heat input amount is calculated; s3, cutting a plurality of cuboid thermal simulation initial samples of which the length directions are parallel to the rolling direction of the steel plate from the sample steel; s4, two-pass welding thermal simulation cycle experiments at different temperatures are set; s5, two thermocouples are welded to the center of the cuboid thermal simulation initial sample for temperature measurement, and a welding simulation experiment is completed; and S6, size machining is conducted on the welding sample, a low-temperature impact experiment is conducted, impact energy under different technologies is measured, and the optimal impact toughness of CGHAZ and ICCGHAZ is determined. The method can be used for developing and optimizing the welding process with insufficient low-temperature impact toughness of the submerged-arc welding heat affected zone of the low alloy steel.

The invention provides a submerged-arc welding device for a special-shaped part, and relates to the technical field of submerged-arc welding equipment, the submerged-arc welding device comprises a submerged-arc welding gun part, and a pressing control part is mounted on the submerged-arc welding gun part; the downward pressing control piece is used for adjusting downward pressing force; a welding path rolling part is mounted on the downward pressing control part; the welding path rolling part is used for rolling a welding path; a bottoming fitting piece is mounted on the submerged-arc welding gun part; the bottoming fitting piece is positioned below the pressing control piece; a bottoming detection piece is mounted on the bottoming fitting piece; the bottoming detection piece is used for detecting the bottoming width; the device can be used for detecting the initial backing uniformity of carbon dioxide arc welding, the advancing speed of a welding wire can be conveniently controlled for compensation, the uniformity of a welding path is improved, and the problems that an existing special-shaped part submerged-arc welding device cannot conveniently conduct leveling adjustment work on special-shaped welding seams and cannot automatically test backing parameters of carbon dioxide arc welding are solved.

The invention relates to the field of weld joint grinding, in particular to an outer weld joint grinding device for a longitudinal submerged arc welding pipe and robot grinding equipment, and aims to relieve the technical problem that an abrasive belt is prone to excessive grinding in the related technology. The outer welding seam coping device for the longitudinal submerged arc welding pipe comprises a grinding head; the grinding head comprises a triangular fixing frame, a rotating wheel, an abutting wheel, an abrasive belt and a limiting wheel. The number of the rotating wheels is two, and the two rotating wheels and the abutting wheel are all connected with the triangular fixing frame in a pivoted mode and arranged at the corners of the triangular fixing frame respectively so as to be distributed in a triangular mode. The abrasive belt is wound and tensioned on the abutting wheel and the two rotating wheels. The two limiting wheels are arranged on the two sides of the abutting wheel respectively and connected with the triangular fixing frame in a pivoted mode, the rotating axis of each limiting wheel coincides with the rotating axis of the abutting wheel, and meanwhile the diameter of each limiting wheel is larger than that of the abutting wheel. The limiting wheels are arranged on the two sides of the abutting wheel, so that the grinding amount of the abrasive belt is limited, the welding seam strength can be ensured, and meanwhile, pipe body base metal is protected.

The invention relates to an angle seam submerged arc welding device which comprises a bearing table, an arc welding machine and a machining table. The machining table is arranged above the bearing table, and the arc welding machine is placed on the edge of the bearing table. A linkage module is arranged below the machining table, and a plurality of change modules are arranged on the side, facing the linkage module, of the machining table. A first long-strip-shaped hole is reserved in the machining table, a circular truncated cone is arranged on the first long-strip-shaped hole in a telescopic movement mode, a cylinder is connected to the back of the circular truncated cone, a U-shaped frame is connected to the portion, facing a workpiece, of the cylinder, a limiting module is arranged on the inner edge of the U-shaped frame, and a compensation module is arranged on the back of the U-shaped frame. According to the angle seam submerged arc welding device, through the rotary design of the variable module, the module is limited to rotate by 1 / 12 angle after each time of operation, contact points with a workpiece are replaced, contact is evenly distributed, and the service life is prolonged.

The invention discloses a one-time forming submerged-arc welding method for butt joint of marine steel thin plates, which comprises the following steps of: flatly laying the thin plates needing to be in butt joint on a welding platform, and adjusting a butt gap between the thin plates needing to be in butt joint; welding and fixing run-on plates at the two ends of the weld bead, not forming grooves in the four sides of each run-on plate, and keeping the plate thickness and the material consistent with the base material; a liner is fixed to the back face of the welding bead, the liner is a ceramic liner, a groove is formed in the middle of the ceramic liner in the length direction and located below a welding seam of the steel plate to be welded, and the ceramic liner on the two sides of the groove is tightly attached to the thin plates on the two sides of the welding bead; a submerged arc welding machine walking trolley track is laid on one side of the welding bead, and one end of the welding bead is welded through a welding machine; after welding is completed, welding coatings on the welding front face are removed, ceramic gaskets on the welding back face are removed, and air cooling is conducted for natural temperature; wherein the thickness of the marine steel thin plate is 6-12mm. According to the method, electric arcs are dispersed, heat input is reduced, thermal deformation is reduced, and a welding seam is formed at one time.

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 double-face longitudinal submerged arc welding steel pipe manufacturing equipment, and relates to the technical field of longitudinal submerged arc welding, the double-face longitudinal submerged arc welding steel pipe manufacturing equipment comprises a base and a storage rack, the top of the base is provided with two second sliding rails and two walking mechanisms, the tops of the two walking mechanisms are fixedly connected through a portal frame, and the inner side of the portal frame is provided with a welding flux recycling structure; the welding flux recycling structure comprises a hollow storage box, the hollow storage box is fixedly connected with the portal frame through a plurality of mounting frames, two notches are formed in the inner side of the hollow storage box, a conveying belt is arranged in the hollow storage box, and a sawtooth belt is fixedly connected to the outer portion of the conveying belt. And a motor I is arranged outside one mounting frame. By means of the double-face longitudinal submerged arc welding steel pipe manufacturing equipment, the problem that welding flux or welding slag pieces cannot be completely recycled can be solved, and meanwhile the problem that two end areas of a steel pipe need secondary supplementary welding can be solved.

The present invention relates to a fatigue-resistant and corrosion-resistant 500 MPa-grade steel plate for marine wind power, the chemical composition of which is as follows, by mass percentage: C: 0.10%-0.12%, Si: 0.20%-0.30%, Mn: 1.20%-1.40%, P≤0.010%, S≤0.005%, Nb: 0.030%-0.040%, Ti: 0.018%-0.030%, Ni: 0.28%-0.38%, Cu: 0.35%-0.55%, Al: 0.020%-0.050%, Pcm being controlled to be ≤0.25%, and the remainder being Fe and unavoidable impurity elements. The 500 MPa-grade steel plate for marine wind power of the present invention is produced using a TMCP+tempering process, and has a thickness of 30 mm-60 mm, a yield strength of ≥500 MPa, a tensile strength of 600-760 MPa, an elongation after fracture of ≥17%, and a core impact energy of ≥120 J at -30℃. Corrosion resistance is improved by 50% or more compared with conventional 355 MPa-grade steel plate for marine wind power. After the steel plate is welded by submerged arc welding with a heat input of ≥35 kJ / cm, the tensile strength of the welded joint is ≥600 MPa, and the impact energy at -30℃ is ≥80 J; under conditions of a stress ratio of 0.5, the fatigue limit of a welded joint after 107 cycles of axial loading is ≥450 MPa. The steel has the characteristics of high strength, fatigue resistance, corrosion resistance and easy welding, and can meet the development requirements of safe service, high strength and light weight for marine wind power facilities.

Provided is a submerged arc welding method including: receiving setting of a gain indicating responsiveness of a variation in a feeding speed of a welding wire with respect to a variation in an arc length; detecting a welding voltage corresponding to the arc length; controlling the arc length by changing the feeding speed of the welding wire on the basis of the detected voltage, and controlling the arc length by changing the feeding speed of the welding wire on the basis of the detected voltage, a predetermined voltage corresponding to a predetermined arc length, and the received gain.

The invention relates to the field of thick plate H steel welding, in particular to a back-gouging-free full penetration automatic welding method for thick plate H steel, and provides the following scheme aiming at the problems of large welding shrinkage and low welding efficiency during full penetration welding of H steel thick plates in the prior art: the method comprises the following steps: S1, forming single-side 35-degree grooves in two sides of an H steel web; s2, the welding position in the middle of the H-steel flange plate and the groove position of a web plate are polished; s3, according to different thicknesses of the H steel plates, the reversible deformation angle of the flange plate is adjusted; and S4, H steel is assembled, two times of positioned welding and fixing are conducted between the web and the two flange plates, and temporary supports are arranged. According to the method, the thick plate H steel is prefabricated in advance and subjected to reverse deformation, flange plate deformation and cross section size deviation are reduced, the operation without back gouging on the reverse side is achieved through the welding mode of low-current bottoming and submerged-arc welding secondary penetration, and the machining efficiency and the full penetration first-pass yield of the thick plate H steel are improved.

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 submerged arc welding, and discloses a high-speed submerged arc welding method and system. In the submerged-arc welding process, special waveform control is adopted, that is, periodic voltage amplitude control is adopted for the welding voltage, cyclic control is conducted between the high-voltage period and the low-voltage period, and electric arcs in the high-voltage state and the low-voltage state repeatedly act on the combination position of the two base materials; and meanwhile, the welding current and the welding voltage are kept to have the same change trend. In the high voltage period, a rotating jet flow transition mode is adopted to blow away molten metal to expose unmolten base metal, meanwhile, the metal side wall of a molten pool is supported, the shape of the molten pool is kept, and electric arcs are stabilized; in the low-voltage period, a large-drop-shaped transition mode is adopted, the top end of the welding wire is lower than the base metal, and the bottom of the base metal is heated to increase the fusion depth. According to the invention, thick plate welding can be carried out by combining a welding wire with a smaller diameter with a general welding flux, and the method has the advantages of high wire feeding speed, increased penetration depth, narrowed weld bead, improved welding quality and the like.

The invention relates to the technical field of ocean engineering steel pipe submerged-arc welding, and provides a welding flux supporting system for an ocean engineering steel pipe vertical joint submerged-arc welding machine and a welding technology.The flux supporting system comprises a bracket used for the outer side of a steel pipe and arranged in a sliding mode relative to the outer wall of the steel pipe, and the bracket is used for containing a welding gun for welding; the material supporting table is rotationally arranged relative to the bracket, is located below the welding gun and is used for supporting welding flux; the sliding seat is slidably arranged relative to the material supporting table and is close to or far away from the outer wall of the steel pipe after sliding; the first movable supporting plates are arranged relative to the material supporting table in a sliding mode and located below the material supporting table, and the first movable supporting plates abut against the outer wall of the steel pipe. One second movable supporting plate is arranged between any two adjacent first movable supporting plates, and the second movable supporting plates are hinged to the first movable supporting plates; by means of the technical scheme, the problem that in the prior art, when the steel pipes are welded in the vertical state, the universality of the material supporting table is poor for the steel pipes of different diameter models is solved.

The invention discloses an efficient and intelligent submerged-arc welding device for a wind power generation tower drum, and relates to the technical field of wind power tower drum installation and welding. The device comprises a base, supports are arranged at the two ends of the top of the base, and two bearing columns are rotationally arranged on the two supports; the base is provided with a sliding rail, and the two moving seats are arranged on the sliding rail in a sliding and sleeving mode; the tower drum is supported through the two supporting columns which are horizontally arranged in parallel, the tower drum can be directly hoisted on the supporting columns through a gantry crane, blocking does not exist around the tower drum during hoisting, and after the tower drum is hoisted and placed, the two moving seats are adjusted to be close to each other, so that the tower drum is supported. The ends, far away from each other, of the two tower barrels are fixed to the two mounting barrels through the inner supporting pieces correspondingly, the first motor drives the guide rod to rotate, the two tower barrels are driven to synchronously rotate under the rotating bearing of the bearing column and the meshing of the first gear and the teeth of the gear ring, the tower barrels rotate stably, and meanwhile the tower barrels can rotate stably. And the tower drum is convenient to mount before or after being welded.

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 invention discloses an arc striking device for longitudinal submerged arc welding of a steel pipe, and belongs to the field of steel pipe welding processes, the arc striking device comprises a pipe to be welded and an arc striking pipe, the pipe to be welded and the arc striking pipe are jointly and movably provided with an installation block, and the installation block is provided with a fixing assembly; the fixing assembly comprises a threaded rod rotationally installed on the installation block, and a linkage block is installed on the threaded rod in a threaded mode. According to the scheme, a fixing plate is arranged, a to-be-welded pipe and an arc striking pipe can be fixed through the fixing plate before arc striking, meanwhile, a spring telescopic rod is driven to move through a push rod in the moving process of an extrusion plate, and after the fixing plate is attached to the inner wall of the arc striking pipe, the output end of the spring telescopic rod makes contact with a fixing groove; at the moment, the output end of the spring telescopic rod extends and is inserted into the fixing groove, the piston plate is fixed, namely, the fixing plate is fixed and cannot move, so that the situation that the fixing plate moves in the arc striking process, the arc striking tube deviates, and the arc striking effect is affected is avoided, and the effect of improving the arc striking effect is achieved.

The utility model provides a positioning device of a linear submerged arc welding pipe end cutter, which comprises a base, a rotating roller, a positioning component, an inner support component and a cutting component, the rotating roller is arranged above the base, the positioning component is arranged above the base, the inner support component is arranged on the positioning component, and the cutting component is arranged above the base; the positioning device is composed of the base, the rotating roller, the positioning assembly, the inner supporting assembly and the cutting assembly and used for positioning the welded pipe end cutting machine, a welded pipe enters the end cutting machine through the rotating roller, the positioning assembly can be adjusted according to the size of the outer wall of the welded pipe, the clamping plate is in an arc shape so that the welded pipe can be better clamped, and the welding pipe can be conveniently clamped. And the positioning assembly is pushed by the air cylinder, so that the clamping force can be unified, the response speed is high, the operation is simple, and the production time is greatly saved while the welded pipe is not damaged.

The utility model discloses a straight seam welding device for a heavy conical pipe, which relates to the technical field of heavy steel pipe processing and comprises a ground rail, a welding door frame is arranged on the ground rail, a submerged arc welding gun is arranged on the welding door frame, a jig frame is arranged in the door frame, clamping arms are symmetrically arranged on two sides of the jig frame, clamping hydraulic cylinders are mounted on the clamping arms, and the clamping hydraulic cylinders are connected with the welding door frame. A supporting seat is fixedly arranged at one end of the jig frame, the jig frame is provided with a sliding rail parallel to the ground rail, a sliding seat is arranged on the sliding rail in a sliding mode, a driving mechanism enabling the sliding seat to slide along the sliding rail is arranged on the sliding seat in a matched mode, and a wedge block is arranged at the top of the sliding seat; the driving mechanism comprises a lead screw penetrating through the sliding seat, a synchronous belt is arranged at one end of the lead screw, and a driving motor is arranged on the synchronous belt; according to the utility model, the wedge block is driven by the driving motor to be inserted between the conical pipe and the jig frame, so that a welding bead is in a horizontal state, and the quality of a welding seam is further ensured.

A manufacturing method of a supercritical carbon dioxide corrosion resistant ultra-high strength longitudinal submerged arc welded pipe comprises the steps that S1, molten iron containing high Mn and high Cr is continuously cast into a plate blank, and the plate blank is heated at 1140-1270 DEG C to be manufactured into a steel plate; s2, gradually pressing the steel plate into a J shape for multiple times, then pressing the steel plate into a C shape for multiple times, and finally pressing the middle of the steel plate into a tubular part with an O-shaped opening; s3, the tubular part is subjected to internal and external automatic submerged arc welding, and a longitudinal submerged arc welding pipe is obtained; s4, quenching and tempering heat treatment is conducted on the longitudinal submerged arc welded pipe; and S5, the longitudinal submerged arc welded pipe is subjected to thermal diameter expansion, and the supercritical carbon dioxide corrosion resistant ultra-high-strength longitudinal submerged arc welded pipe is obtained. According to the manufacturing method, 2-3% of Mn and 3-9% of Cr are added to be rolled into a steel plate, then JCO forming is carried out, internal and external welding is completed through a welding wire containing Cr and Ni, thermal expanding is carried out after quenching and tempering heat treatment, and the ultrahigh-strength carbon dioxide conveying welded pipe which is high in corrosion resistance and excellent in low-temperature toughness is manufactured.

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 invention relates to the technical field of rare earth steel welding, in particular to a rare earth steel structure welding device and method. Comprising a plurality of supporting units used for bearing the rare earth steel structures, a gas shield welding unit is arranged between every two adjacent supporting units, and the gas shield welding units are used for conducting backing welding on weld joint areas, fixed to the supporting units, of the rare earth steel structures; first transverse moving mechanisms are arranged on the two sides of the supporting unit, vertical moving mechanisms are arranged on the two first transverse moving mechanisms correspondingly, a moving cross beam plate is arranged between the vertical moving mechanisms, the submerged-arc welding unit and the cleaning unit are connected with the moving cross beam plate, the submerged-arc welding unit is used for conducting filling welding on the backing welding portion of the rare earth steel structure, and the cleaning unit is used for cleaning the backing welding portion of the rare earth steel structure. The cleaning unit is used for cleaning weld zone base metal of the rare earth steel structure; the invention aims to solve the technical problem of how to carry out submerged-arc welding filling welding after gas shielded welding bottoming of rare earth steel.

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 the technical field of storage and transportation pipelines, in particular to a Zr microalloying welding wire for a submerged arc welding steel pipe of a hydrogen transportation pipeline. The Zr microalloying welding wire for the submerged arc welding steel pipe of the hydrogen transmission pipeline comprises the following chemical components in percentage by mass: 0.06 to 0.10 percent of C, less than or equal to 0.30 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, 0.10 to 0.20 percent of Cr, 0.15 to 0.30 percent of Ni, 0.10 to 0.30 percent of Mo, less than or equal to 0.25 percent of Cu, 0.02 to 0.10 percent of Ti, 0.06 to 0.12 percent of Zr and the balance of Fe and inevitable impurities. The Zr microalloying welding wire for the submerged-arc welding steel pipe of the hydrogen transmission pipeline is matched with a low-hydrogen fluorine alkaline flux, and is suitable for double-sided multi-wire submerged-arc welding of the hydrogen transmission pipeline steel pipe with the steel grade of X60 / L415 or below, and after welding, the yield strength of weld metal is 450-550 MPa, the tensile strength is 550-650 MPa, the hardness is smaller than 220 HV10, and the low-temperature impact energy at the temperature of-20 DEG C is larger than 80 J.

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 discloses a pipeline all-position submerged arc welding optimization method, device and equipment based on temperature field monitoring and welding seam tracking and a storage medium, and relates to the technical field of submerged arc welding, the method comprises the steps that a three-dimensional pipeline model is obtained, and width, depth and curvature information of a target welding seam area in the three-dimensional pipeline model is extracted; a welding gun path is planned according to the width, depth and curvature information, and a welding gun is controlled to move along the welding gun path; under the condition that the welding gun moves, the temperature field of the target welding seam area is monitored, and the target welding current, the target welding voltage and the offset of the welding gun position are calculated according to the temperature field; and the welding current, the welding voltage and the position of the welding gun are adjusted based on the target welding current, the target welding voltage and the offset, and welding optimization is completed. According to the method, the welding quality and the heat input uniformity of all-position submerged arc welding of the pipeline are improved by accurately tracking the welding seam position and monitoring the temperature field change in real time, and the stability and the high efficiency of the welding process are ensured.

The invention relates to the technical field of submerged arc welding equipment, in particular to an automatic submerged arc welding unit which comprises a cover with the section of an isosceles trapezoid structure, the cover at least comprises a horizontal plate and elastic inclined plates located on the two sides of the horizontal plate, and the included angle between the horizontal plate and the elastic inclined plates is adjustable. And the scaling powder stacked on the groove of the workpiece to be welded is shaped. According to the submerged-arc automatic welding unit, the inner space of the cover has the capacity of evenly placing the scaling powder, when the scaling powder is scattered all around, the elastic inclined plate buffers and absorbs impact force, scaling powder escape is reduced, and the scaling powder is stably isolated in the welding process; and the grid plate pokes the scaling powder in front of welding operation aside, most of splashing slag is conveyed away from the position above a groove to be welded, welding interference generated when a rear welding head passes through is reduced, the welding process is more stable, and the safety influence on workers is weakened.