986 results about "Submerged arc welding" patented technology

Disclosed are a flux-cored welding strip and a welding flux used in combination for submerged arc welding of a duplex stainless steel, and preparation methods and use thereof. The flux-cored welding strip is composed of a stainless steel shell and a flux core powder, the flux core powder consisting of the following components: in percentages by mass, ferrochrome nitride: 0.70% to 1.0%, a chromium powder: 26% to 27%, a nickel powder: 4.5% to 5.5%, a molybdenum powder: 3.7% to 4.2%, a manganese powder: 2.55% to 2.65%, a copper powder: 1.45% to 1.55%, a ferrosilicon powder: 1.1% to 1.2%, a tungsten powder: 1.0% to 1.15%, a niobium powder: 0.25% to 0.35%, an aluminum powder: 0.35% to 0.55%, a rhenium powder: 0.35% to 0.40%, a lanthanum powder: 0.1% to 0.15%, and a balance being an iron powder.

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 a submerged-arc welding external welding device for a pressure vessel and an external welding method of the submerged-arc welding external welding device, and belongs to the technical field of submerged-arc welding external welding. Comprising a supporting base; submerged-arc welding equipment is arranged on the side surface of the supporting base; the turnover support is movably arranged on one side of the supporting base; a rotating ring is rotationally connected into the overturning support. A rotating cylinder is movably connected into the rotating ring; a thread clamping assembly is arranged on the rotating cylinder body; the movable support is movably arranged on the other side of the supporting base; a thread fixing assembly is arranged on the movable bracket; the rotation driving mechanism comprises a telescopic supporting assembly and two overturning driving assemblies; the movable support is further provided with a movable overturning assembly. According to the pressure vessel submerged-arc welding external welding device and the external welding method thereof, hoisting movement of the tank body and the tank bottom is facilitated, and when the tank body and the tank bottom are driven to turn over, it can be guaranteed that the tank body and the tank bottom turn over stably.

The invention relates to a guide pipe submerged-arc welding positioning device and method. The guide pipe submerged-arc welding positioning device comprises a workbench, and a first butt joint mechanism and a second butt joint mechanism are arranged in a containing groove in the workbench; a first clamping mechanism and a second clamping mechanism are arranged on the upper end face of the workbench, a positioning mechanism is arranged on one side of the upper end face of the workbench, through fixing of a plurality of pressing blocks, it is effectively guaranteed that the first pipeline and the second pipeline are located on the same central axis, and accurate butt joint of the end faces of the first pipeline and the second pipeline is also guaranteed; and pipelines with different diameters can be fixed, so that the practicability is improved, and the functionality is increased.

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 provides a wind power single pile lifting lug welding method, and the method uses the following devices, the devices comprise a portal frame, tower barrel moving channels are formed in the middles of frame bodies on the two sides of the portal frame, an equipment mounting platform is arranged on the portal frame in a lifting mode, and a lifting lug is sent into a welding area through a workpiece lifting hole; and the welding device is an automatic welding mechanical arm, enclosure air bag rods are telescopically inserted into the multiple telescopic holes, and the multiple enclosure air bags extrude one another in the expansion process and define an annular air bag compartment with the lifting lugs. The arc-shaped ramp is provided with the annular air bag compartment, and the particle flux is evenly laid in the annular air bag compartment, so that the problem that the particle flux cannot be attached to the surface of the arc-shaped ramp of the tower drum is solved, the lifting lug can be welded in a submerged-arc welding mode, splashing and sparks generated in the welding process are reduced, the possibility of welding deformation is reduced, and the welding quality is improved.

The invention relates to the technical field of spiral steel pipe forming, and discloses a double-sided submerged arc welding spiral steel pipe forming device which comprises a rotating assembly, a long rod is arranged at the center of the rotating assembly, a carrier is installed at the end, away from the rotating assembly, of the long rod, and four grooves are evenly formed in the outer wall of the carrier. Through the arrangement of the carrier and the groove, the long-strip iron sheet moves in the inclination direction of the forming wheel when moving in the pipe body, the long-strip iron sheet is spirally guided in the inclination direction of the forming wheel to form a spiral pipe, and when the spiral pipe passes through the welding gun, the welding gun welds a spiral gap in the spiral pipe; and generated disintegrating slag falls into the groove to be collected, so that the problem that after the spiral pipe is formed, the disintegrating slag on the inner wall of the spiral pipe needs to be cleaned subsequently is solved.

The invention belongs to the field of spiral submerged arc welding pipe manufacturing, particularly relates to a spiral steel pipe blank size real-time detection device and a pipe blank size detection method, and aims to solve the problems of large workload, high adjustment difficulty and inaccurate measurement result caused by frequent disassembly and assembly in the lane changing and shape adjusting process. The device comprises a fixed base, a support, a stand column, a linear sliding table, an annular frame device and a laser distance measuring sensor. By adjusting the angles and the positions of the stand column and the linear sliding table, the circle center of the annular frame device coincides with the circle center of a pipe blank, and then the size of the pipe blank is measured through the laser distance measuring sensor. According to the invention, data measurement is timely, accurate and reliable, and defects of manual measurement can be effectively eliminated; compared with a traditional measuring device, the problems that the workload is large, the adjusting difficulty is high and the measuring result is inaccurate due to the fact that frequent disassembly and assembly are needed in the lane changing and shape adjusting process are solved.

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 utility model provides an automatic submerged arc welding fixing assembly applied to an arc-shaped steel plate. The four mounting blocks are fixedly mounted on the periphery of the top of the steel plate, connecting blocks are fixedly mounted on the tops of the mounting blocks, sliding arms are fixedly connected to the tops of the two connecting blocks, and scale values are arranged on the surfaces of the sliding arms; the two fixing blocks are fixedly installed on the two sides of the outer surface of the sliding arm respectively. According to the automatic submerged arc welding fixing assembly applied to the arc-shaped steel plate, the rotating block is adjusted to drive the threaded rod to rotate, and the meshing limiting device slides on the surface of the sliding arm, so that the limiting block moves to the position where a submerged arc welding machine stops welding, and the submerged arc welding machine is prevented from continuing to move; and an operator can observe whether the limiting block and the sliding block are connected or not, so that the situation of insufficient welding or excessive welding of the submerged arc welding machine is avoided, and the welding accuracy is improved.

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 system and method for submerged arc welding. The system advances a consumable welding electrode toward a workpiece, and then stops the advancement when the consumable electrode makes contact with the workpiece. The system provides a preheating current level through the consumable welding electrode proximate the workpiece while the consumable welding electrode is in contact with the workpiece during a preheating period of time to preheat the portion of the consumable welding electrode without establishing an arc. The system then retracts the consumable welding electrode from the workpiece and increases the preheating current level to a welding current level over an arc establishment period of time to establish an arc between the consumable welding electrode and the workpiece. The system then begins to form a weld by advancing the consumable welding electrode toward the workpiece again, resulting in melting the consumable welding electrode and depositing molten metal onto the workpiece.