606 results about "Submerged arc welding" patented technology

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 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 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 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 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 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.

The invention belongs to the technical field of spiral submerged arc welding pipes, and particularly relates to a spiral submerged arc welding pipe suitable for hydrogen conveying and a manufacturing method of the spiral submerged arc welding pipe. The invention discloses a spiral submerged arc welding pipe suitable for hydrogen conveying. The spiral submerged arc welding pipe comprises the following chemical element components in percentage by weight: 0.03-0.06% of C, 0.05-0.45% of Si, 0.7-1.45% of Mn, less than or equal to 0.0015% of S, less than or equal to 0.008% of P, 0.01-0.3% of Ni, 0.01-0.3% of Cr, 0.001-0.15% of Cu, 0.02-0.06% of Nb, 0.002-0.05% of V, less than or equal to 0.03% of Ti, less than or equal to 0.001% of Mo, less than or equal to 0.04% of Al, less than or equal to 0.0003% of B and the balance of Fe. The spiral submerged arc welding pipe has the characteristics of fine and uniform crystal grains of a pipe body and a welding seam structure, low segregation, high size precision of a welded pipe, excellent fracture toughness, excellent hydrogen induced cracking resistance, small residual stress and the like, and can meet the requirements of conveying of pure hydrogen and hydrogen doped with 20% of hydrogen at 6.3 MPa and below and field ring welding butt joint.

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 relates to the technical field of welding, in particular to an ocean wind power single pile foundation super-thick plate welding method which comprises the steps that X-shaped groove plates are adopted for plate assembly, and the groove angle, the assembly gap and the truncated edge of each plate meet the assembly technical requirements; the plate is subjected to backing welding through a flux-cored wire, and the welding method is semi-automatic gas shielded welding; the plate is filled with solid submerged arc welding wires and subjected to cosmetic welding, and the welding method is double-wire submerged arc welding. Appropriate plates are selected for assembly so as to reduce gaps generated during assembly of the plates and meet technical requirements, deviation of backing welding is reduced through gas shielded welding, then double-wire submerged arc welding is used for filling and cosmetic welding, and meanwhile the problems that weld metal of the double-wire submerged arc welding is low in impact toughness and low in welding quality are solved by setting appropriate welding parameters. The problems that the welding efficiency of an original single wire is low, and the welding material waste is high are solved, and the production cost in the welding work is reduced.

The present invention relates to the technical field of welding equipment, and specifically discloses a steel pipe pole flange welding robot and its welding process, which includes a frame, a clamping and rotating mechanism, a submerged arc welding device, a material receiving mechanism and a positioning mechanism. The submerged arc welding device includes an adjusting arm, a wire feeding head, a flux hopper and a conductive nozzle. The material receiving mechanism includes a fixing plate and two telescopic plates. The fixing plate is arranged at the clamping center of the clamping assembly. Both telescopic plates are installed at the upper end of the fixing plate and form a material receiving groove. The length of the telescopic plate can be adapted according to the distance between the fixing plate and the inner wall of the steel pipe pole or flange. The positioning mechanism includes two positioning rods and a second driving member. The positioning rods are slidably matched with the telescopic plates correspondingly. The present invention can realize the butt joint positioning between the steel pipe pole and the flange through the positioning rods, and can, through the cooperation of the positioning rods and the telescopic plates, make the flux accumulate in the material receiving groove to form a flux lining, ensure that the flux evenly covers the weld, and further ensure the welding quality.

A pre-coated steel substrate wherein the coating including at least one titanate and at least one nanoparticle; a method for the manufacture of an assembly; a method for the manufacture of a coated steel substrate and a coated substrate substrate. It is particularly well suited for construction, shipbuilding and offshore industries.

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 discloses a welding device for a longitudinal submerged arc welding pipe, which comprises a steel pipe semi-finished product which is formed by rolling a steel plate through a forming machine, a shaping mechanism which is horizontally arranged and can allow the steel pipe semi-finished product to pass through in a matched manner and form positioning in the circumferential direction of the steel pipe semi-finished product, and a V-shaped roller way conveyor which is arranged on the shaping mechanism, the V-shaped roller way conveyor is arranged at the input end of the shaping mechanism in a butt joint mode and used for feeding semi-finished steel pipe products, the welding mechanism is erected at the output end of the shaping mechanism and used for welding the splicing positions of the semi-finished steel pipe products, the aligning mechanism is arranged between the shaping mechanism and the V-shaped roller way conveyor and used for adjusting the positions of V-shaped grooves, and the limiting guide mechanism is arranged between the welding mechanism and the shaping mechanism and used for limiting the positions of the V-shaped grooves. The invention relates to the technical field of welding equipment. According to the welding device for the longitudinal submerged arc welding pipe, by introducing the alignment mechanism, automatic alignment of a V-shaped groove in a semi-finished steel pipe and the output end of the welding mechanism is achieved, dependence on manual adjustment is reduced, and the alignment precision is improved.

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 invention relates to a welding method of Q345qD-IMEC corrosion-resisting steel for bridges, which comprises the following steps: selecting a welding material: adopting a combination of a welding wire and a welding flux for submerged-arc welding, adopting at least one of the following welding wires: a flux-cored welding wire and a solid welding wire for CO2 gas shielded welding, machining a groove: machining the groove according to a welding joint form, according to the welding process, the welding parameters of submerged arc welding are that the current is 620 + / -30 A, the voltage is 28 + / -2 V, and the welding speed is 34-36 cm / min; the welding parameters of CO2 gas shielded welding are as follows: the current is 140-270 A, the voltage is 26-30 V, the welding speed is 10-25 cm / min, and the gas flow is 16-22 L / min; and then post-welding detection is carried out.

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 utility model provides a dissimilar steel strip isolating layer submerged-arc welding structure which comprises a first base material and a second base material, the edges of the first base material and the second base material are subjected to the same beveling operation, specifically, the front side and the back side of each plate end are each provided with a beveled edge, the plate ends are assembled to form an X-shaped beveled edge, and a truncated edge is reserved in the middle of each beveled edge; and surfacing the edge of the first base material to form a first welding body with the same thickness, butting the edges of the first base material and the second base material, and welding to obtain a second welding body. According to the method, subsequent submerged-arc welding is converted into similar steel welding through the isolation layer structure, and the risk of cracking caused by interaction of high residual stress and brittle structures after dissimilar steel welding is eliminated; and meanwhile, the problems that a wide recarburization and decarburization layer is generated due to carbon diffusion migration in direct welding of dissimilar steel, and cracking is caused due to serious ferrite embrittlement of a decarburized wide ferrite belt under long-time heat treatment and high-temperature operation are solved.

The invention provides a nuclear power tube plate submerged-arc welding device which is characterized in that a base, a ground track and a crawler drag chain form a horizontal longitudinal coarse adjustment mechanism, a mechanical arm is provided with a horizontal transverse and vertical position coarse adjustment mechanism, one end of the mechanical arm is provided with a wire feeding mechanism, and the other end of the mechanical arm is provided with a welding gun connected with the wire feeding mechanism; the welding gun is connected with the mechanical arm through the cross-shaped sliding table module and the index plate and used for achieving fine adjustment of the spatial position and angle of the welding gun. A pressing roller clamping device is arranged on one side of the stand column and comprises a rolling wheel assembly and a pressing roller assembly, a pipe fitting to be welded is clamped between the rolling wheel assembly and the pressing roller assembly, and the pressing roller clamping device drives the pipe fitting to be welded to rotate around the parallel axis in the length direction of the mechanical arm; the using method comprises the steps of preliminarily fixing the to-be-welded assembly, hoisting the to-be-welded assembly in place, adjusting the welding angle, roughly adjusting the position of the welding gun, finely adjusting the position of the welding gun and welding. The problems that a submerged arc welding process cannot be adopted for a full penetration weld of a steel lining penetration piece sleeve tube plate, and the welding quality, the quality and the automation level are low are solved.

The utility model discloses a multifunctional welding and transporting trolley for connecting and transferring multiple sections of steel pipes, belongs to the technical field of transporting trolleys, and solves the problem that an existing transporting trolley is single in function. The system comprises at least one group of transfer trolley components movably arranged on a track, and each group of transfer trolley components comprises a driving trolley and a driven trolley; the driving trolley and the driven trolley each comprise a base movably arranged on the track, rolling wheels are arranged at the two ends of the top of each base, each base is provided with a hydraulic lifting assembly used for lifting the multiple sections of steel pipes, and the driving trolley is provided with a driving assembly used for driving the rolling wheels on the driving trolley. Compared with an existing transport trolley only having a transport function, the transport trolley has more functions, has the functions of lifting and rotating multiple sections of steel pipes through the hydraulic lifting assembly and the driving assembly, and facilitates the operation of connecting the multiple sections of steel pipes, performing submerged-arc welding and transferring the multiple sections of steel pipes to a mounting station in a tunnel.