95 results about "Submerged arc welding" patented technology

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

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

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

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

The application provides a kind of automatic submerged arc welding system of butt joint welding seam of thick plate single-sided welding double-sided forming, and relates to the technical field of welding automation, comprising, front submerged arc welding module: set in the front of butt joint of thick plate to be welded, for carrying out submerged arc welding along the butt joint welding seam of the thick plate, the automatic submerged arc welding system of butt joint welding seam of thick plate single-sided welding double-sided forming, by setting front submerged arc welding module, back forming module, fitting adjusting module, synchronous walking module and control module, and combining with the welding seam state detection module to detect and linkage control welding seam position, welding seam gap and back fitting state in real time, realize the single-sided submerged arc welding double-sided forming of butt joint welding seam of thick plate. Thus, without turning over workpiece and back surface cleaning, welding penetration and back continuous forming can be completed, the automation level and production efficiency of thick plate welding are improved, and the adaptability to assembly gap fluctuation and plate flatness deviation is improved.

The utility model relates to the technical field of turnover position change, provide a door type submerged arc welding machine long side turnover position change device, including base, the top of base is provided with work bench, the both sides of base top all are fixed with limit support, the both sides of work bench all are provided with turnover structure. The utility model discloses through being provided with fixed knot structure, when the movable disc drives the clamping plate reverse movement through the hinged rod, the clamping plate will drive the guiding seat inside the movement of guide groove, under the action of guiding seat, the stability of clamping plate when moving is strengthened, under the action of ball, the friction between guiding seat and work bench is reduced, and the clamping plate after moving drives rubber pad clamping in the one side of work piece, under the action of rubber pad, the friction between clamping plate and work piece is increased, so as to fix work piece, realize the function that the device is convenient for preventing displacement or overturning, thereby improved the applicability of the door type submerged arc welding machine long side turnover position change device when using.

The disclosed technology relates generally to welding technologies and more particularly to electrode assemblies for arc welding, e.g., submerged arc welding. In one aspect, an electrode assembly for submerged arc welding (SAW) comprises a head portion and an extension portion that are arranged serially to feed a consumable electrode therethrough such that, during SAW, the head portion is disposed to be distal to an arcing tip of the consumable electrode and the extension portion is disposed to be proximal to the arcing tip of the consumable electrode. The head portion includes a contact tip configured to electrically contact the consumable electrode to deliver power thereto. The extension portion is formed of a single piece insulating article configured for the consumable electrode to finally pass through before the arcing tip is exposed.

The application relates to the field of square steel submerged-arc welding, and discloses a gantry submerged-arc welding machine for square steel machining, which comprises a gantry, a submerged-arc welding assembly, a stripping and cleaning assembly, a recovery cabin, a recovery assembly, a recovery box and a crushing assembly. The stripping and cleaning assembly strips long strip-shaped welding slag from a weld joint, sweeps and cleans residual scrap slag around the weld joint, and pushes the long strip-shaped welding slag and the scrap slag to the top edge of a U-shaped steel plate so that the long strip-shaped welding slag and the scrap slag fall down. The recovery assembly receives the falling long strip-shaped welding slag and scrap slag and makes the long strip-shaped welding slag and the scrap slag slide into the recovery cabin. The crushing assembly extrudes and crushes the long strip-shaped welding slag and the scrap slag, and discharges the crushed scrap into the recovery box. In the application, the long strip-shaped welding slag protruding from the surface of the weld joint is first stripped by the stripping and cleaning assembly, and the scrap adhering to the recessed part of the weld joint is removed. Then, the long strip-shaped welding slag and the scrap after cleaning are recovered, and extrusion and volume reduction and crushing and volume reduction are completed by the crushing assembly. Finally, the crushed scrap is neatly stored, and the overall welding slag treatment efficiency is improved.

This invention provides a submerged arc welding wire suitable for high heat input welding of 50–150 kJ / cm and its application, belonging to the field of welding materials technology. The submerged arc welding wire provided by this invention comprises the following chemical composition: C: 0.07–0.12%, Si≤0.09%, Mn: 1.70–1.95%, P≤0.012%, S≤0.005%, Ni: 0.55–1.00%, Mo: 0.40–0.58%, Ti: 0.11–0.24%, Nb≤0.05%, V: 0.03–0.04%, Ca≤0.0015%, B: 0.0005–0.0045%, Ce≤0.030%, and the balance Fe. The submerged arc welding wire provided by this invention meets the requirements for the mechanical properties of the deposited metal at a heat input of 50–150 kJ / cm, and is applicable to the production of large welded structural components and high-efficiency welding manufacturing.

The application provides a wear-resistant composite piercing mill head manufacturing method and a piercing mill head, and the manufacturing method comprises the following steps: S1, preparing a steel base head; S2, adopting a submerged-arc welding process to make a flux-cored wire cladded on a working cone surface and a nose end surface of the steel base head, so as to form a cladding layer with a thickness of 6-8 mm; and S3, pre-oxidizing the cladding layer of the steel base head at high temperature, so that the wear-resistant composite piercing mill head is obtained. The wear-resistant composite piercing mill head manufacturing method has a dense and uniform oxide film on the surface of the cladding layer of the piercing mill head, the oxide film is firmly combined with the cladding layer, and the existence of the dense and uniform oxide film can reduce the power consumption of a steel pipe piercing mill and prolong the service life of the piercing mill head.

This invention relates to the field of welding technology and discloses a submerged arc vertical welding method, comprising the following steps: S1, installing a forming component at the vertical butt joint gap of the workpieces to be welded to form a welding cavity; S2, extending at least two welding wires into the welding cavity and supplying welding flux into the welding cavity; S3, controlling the welding wires to ignite under the coverage of the welding flux to establish a weld pool; S4, controlling the welding wires to oscillate within the vertical butt joint gap, and controlling at least two welding wires and at least a portion of the forming component to move synchronously upward along the vertical butt joint gap. The submerged arc vertical welding method provided by this invention can achieve circumferential coverage and stable forming of the weld pool and welding flux, overcome the problem of flow and collapse caused by gravity, and achieve stable automated submerged arc welding, ensuring welding quality.

The present application relates to the technical field of welding, and discloses a FGB single-sided submerged arc welding method, which comprises the following steps: firstly, fixing a first welding part and a second welding part to form a welding groove with a root width of 4-10 mm; then, installing a gasket at the bottom of the welding groove to block; subsequently, laying welding iron powder with a thickness equal to the root width in the welding groove; finally, adjusting a welding trolley to center a cable-type welding wire with one end of the welding groove, starting the trolley to move to the other end while synchronously laying flux, and completing submerged arc welding. Through the synergistic effect of the pre-laid iron powder and the cable-type welding wire, the present application greatly increases the metal deposition rate and effectively buffers the downward impact heat of the electric arc. The method not only completely solves the problem that the gasket is easily burnt through in large-gap and variable-gap welding, but also gets rid of the cumbersome limitation of multi-wire equipment, and can complete efficient and high-fault-tolerant single-sided welding and double-sided forming by using a portable single-head equipment, which is extremely practical on site.

This invention discloses an installation method for shear keys in wind power steel pipe piles. The method includes: prefabrication and rolling of reinforcing bars: cutting, parallel welding, and rolling the shear key reinforcing bars to a fixed length to obtain prefabricated reinforcing bar components that fit the inner diameter of the steel pipe pile; pre-treatment before installation: processing the butt joint surfaces of the reinforcing bar ends and grinding the weld seams on the inner wall of the steel pipe pile to eliminate installation interference; positioning and adjusting the reinforcing bars: positioning by marking internal and external unified reference lines, and using permanent magnet chucks to achieve radial magnetic positioning and full-circumference fit control of the reinforcing bars, ensuring the fit accuracy between the reinforcing bars and the inner wall of the steel pipe pile; ring butt fixing of reinforcing bars: completing the butt welding of reinforcing bars according to different working conditions of the butt joint gap of the reinforcing bar ends using a graded treatment scheme to form a closed ring shear key reinforcing bar; shear key welding and forming: completing the permanent connection between the shear key reinforcing bar and the steel pipe pile through progressive spot welding pre-fixation and circumferential submerged arc welding, obtaining the finished steel pipe pile shear key.

This invention relates to the field of welding material preparation technology, and particularly to a method for preparing submerged arc welding wire based on integrated drawing and copper plating. The method involves coating the copper-plated surface of the welding wire with fluorescent marking grids after copper plating and drying. Dynamic images of the markings on the copper-plated surface are continuously acquired using an imaging system. Quantitative parameters of the two orthogonal diagonals of each fluorescent marking grid are extracted in real time. The presence of pre-existing signs of drawing instability in the corresponding region of the fluorescent marking grid is determined by calculating the elongation parameters of the drawn wire. A sequence of drawing instability evolution directions along the welding wire axis is constructed, and the instability state of the copper plating layer is determined based on the spatial consistency of this sequence. Finally, differentiated fine-drawing process control is implemented for different instability states. This method enables online detection of pre-existing relative slippage between the copper plating layer and the welding wire core during the drawing process. By distinguishing the drawing instability state of the copper plating layer, the preparation process can be adjusted accordingly.

The present invention provides a submerged arc welding power source system capable of stabilizing the shape of the tip of an electrode after welding. In a welding system (A1) for performing submerged arc welding, there are provided a welding power source device (2) provided with an inverter circuit (25) and supplying electric power; a welding wire feeding device (5) feeding a welding wire; and a control device (1) controlling the welding power source device (2) and the welding wire feeding device (5). The control device (1) causes the welding power source device (2) to output an alternating current during welding, causes the welding wire feeding device (5) to stop the feeding of the welding wire at the end of welding, and causes the welding power source device (2) to output an end current as a direct current at the end of welding, and sets an end current period from the start of the output of the end current to the stop.

This invention provides a welding material and welding method for 650MPa-grade multi-wire submerged arc welding suitable for welding with a heat input of 75kJ / cm, belonging to the technical field of welding materials. The welding material provided by this invention comprises the following elements by mass percentage: C: 0.08-0.12%, Si≤0.09%, Mn: 1.70-1.95%, Cr: 0.30-0.45%, Ni: 0.05-0.50%, Mo: 0.40-0.58%, Ti: 0.13-0.24%, V: 0.04-0.05%, B: 0.0005-0.0030%, Mg≤0.005%, Zr≤0.020%, La≤0.030%, P≤0.012%, S≤0.005%, Pb+Sn+As+Sb+Bi≤0.008%, and balance Fe.

The application discloses fine-grained steel SAW fluorine alkali type sintered flux and application, including barium fluoride 28-33%, aluminum ash powder 10-12%, dolomite 5-7%, pre-melted slag powder 25-27%, fluorocarbon cerium ore 2-3%, titanium boron iron 1.5-2.5%, kaolin 6-8%, magnesite 4-6%, silicon calcium aluminum powder 10-13% by weight percentage. The application can meet the submerged arc welding requirement of 65kg grade structural steel in most cases, has good welding process and mechanical properties of post-welding deposited metal, is widely applied in the construction, machinery and other industries, and greatly improves the production and life efficiency of people.

This application discloses a method, apparatus, equipment, and storage medium for all-position submerged arc welding of pipelines based on global 3D reconstruction, relating to the field of welding automation technology. The method includes: acquiring 3D point cloud data of the outer surface of the pipeline to be welded, and establishing a global coordinate system for the pipeline based on the 3D point cloud data; determining a welding path based on the 3D point cloud data within the global coordinate system; controlling a welding execution device to weld along the welding path; performing real-time internal defect detection on the welded seam after welding begins, and obtaining defect detection results; and optimizing welding process parameters in real-time based on the defect detection results until welding is completed. This application can improve the welding quality of pipeline welds.

This application discloses a welding process for high-strength and low-yield-to-tensile ratio bridge steel plates, belonging to the field of steel material welding. The welding process includes the following steps: selecting submerged arc welding wire as the welding material, whose chemical composition and weight percentage are: C 0.06-0.09%, Si≤0.03%, Mn 1.50-1.85%, P≤0.010%, S≤0.003%, Ni 0.40-0.60%, Mo 0.20-0.30%, with the remainder being Fe and unavoidable impurities; the welding process also includes selecting a V-groove type, with both the front and back bevel angles at 60°, and a 2mm blunt edge left at the root. The joint welded using this invention exhibits high tensile strength, fractures at the base material, excellent low-temperature impact toughness, satisfactory cold bending performance, and uniform hardness distribution in the weld and heat-affected zone, achieving a good match of high strength, high toughness, and low yield-to-tensile ratio.

The present application relates to a kind of nuclear power construction in elbow pipe's seam submerged-arc welding equipment, including base, bearing box and clamping seat;The top of the base is equipped with support frame, the bearing box is configured to the front of support frame, the clamping seat can be rotatably installed on the front of bearing box;The back center position of the clamping seat is equipped with connecting seat A, the side of the bearing box towards clamping seat is reserved with movable cavity, the movable cavity is configured with power source, wherein power source control connecting seat B carries out rotary operation, the opening position of the movable cavity is equipped with guide shell.In the scheme, the clamping seat is connected to connecting seat A and connecting seat B through docking operation, and the linkage seat, elastic member and engagement channel in the slope processing of the limiting assembly ensure that the synchronous rotary motion is stable after docking, avoid shaking or deviation, at this moment, it is ensured that the clamping seat does not need additional tools when assembling, and no other operation is needed after docking, further improve work efficiency.

The present application belongs to the technical field of flux scraping, and particularly relates to a flux scraping tool for submerged arc welding of spiral steel pipes, which comprises a base, a support frame, a wall-attached layered cleaning mechanism and a push-type slag removing mechanism. The support frame is arranged on the upper wall of the base. The wall-attached layered cleaning mechanism comprises a height adjusting assembly, a wall-attached assembly and a sanding assembly. The height adjusting assembly is arranged at one end of the support frame. The wall-attached assembly is arranged at the end of the height adjusting assembly away from the support frame. The sanding assembly is arranged on the wall-attached assembly. The present application can separately recycle the sand flux of the outer layer and the intermediate layer of the flux which have not been substantially changed and the slag of the bottom layer of the flux, and can dynamically monitor the bonding strength between the flux layer and the weld to ensure that the flux scraping tool for submerged arc welding of spiral steel pipes has moderate bonding strength between the flux layer and the weld.

The application discloses a super-low-temperature welded pipe and a preparation method thereof, and a welding wire and a welding method for the welded pipe. The steel plate of the welded pipe is composed of C: 0.02-0.03%, Si: 0.10-0.40%, Mn: 2.5-4.0%, Al: 0.05-0.10%, P: ≤0.010%, S: ≤0.002%, other alloy elements ≤1.0%, and the balance of Fe, and the total content of the above components is 100%. A kind of super-low-temperature L450M / L485M steel grade straight seam submerged arc welded pipe with low cost, excellent low-temperature toughness and plasticity is manufactured by using a Mn-Ni-Mo welding wire and a straight seam submerged arc welding method of first outer welding and then inner welding. The material and the weld of the welded pipe have good low-temperature toughness, and the safety of the working process is ensured.

The utility model discloses a kind of small-bore thin-wall straight-seam submerged-arc welding steel pipe pre-welding weld positioning structure, including workbench, workbench one end upper part is fixed with support seat, and support seat is fixed with the inner support rod that penetrates, and multiple positioning rods are telescopically installed on the inner support rod upper part, and clamping rod is movably installed on workbench and located at the both sides of inner support rod, by being sleeved on inner support rod before welding, the gap of steel pipe is aligned at the positioning rod place and is sleeved, so that in steel pipe is sleeved on inner support rod, multiple positioning rods will be located in gap and left and right positioning gap to prevent deflection, it is convenient to weld positioning, it is convenient to weld fast positioning when batch production, the both sides of steel pipe are clamped by the clamping rod of both sides, positioning rod is retracted inside inner support rod while clamping, it is convenient to weld closed when clamping weld positioning, ensure that weld position is correct, improve processing efficiency.

The application relates to the technical field of submerged-arc welding, and particularly discloses a submerged-arc welding process, welding wire and application for manufacturing an induction heating elbow mother pipe, wherein the welding wire comprises the following components in mass ratio: C 0.05-0.09%, Si 0.20-0.25%, Mn 1.55-1.75%, P 0.0010%, S 0.005-0.007%, Al 0.01%, Ni 2.0-4.5%, Cr 0.35-0.45%, Cu 0.45-0.75%, V 0.03%, Nb 0.025%, Mo 0.15-0.3%, Ti 0.01%, and B 0.0005%, wherein Ceq of the alloy is 0.4-0.95%, and Pcm of the alloy is 0.27-0.31%. The welding seam welded by the welding wire and the welding process exhibits strong heat-resistant processing performance and can withstand various types of heat treatment.

This invention discloses a repair method for porosity defects in U-rib internal welds. For full penetration fillet welds, where the U-rib has no beveling before welding, and both the initial internal and external welds between the U-rib and the panel are performed using submerged arc welding, the method includes: (1) locating the location and distribution range of porosity defects in the internal weld area through weld flaw detection; (2) using submerged arc welding wire to reinforce the porosity defect area to eliminate most of the porosity; (3) performing weld flaw detection again to determine the distribution of remaining porosity defects; (4) using air gouging to remove residual defects in the area corresponding to the remaining porosity defects on the outside of the U-rib; (5) using flux-cored welding wire to perform repair welding in the air-gouged area on the outside of the U-rib; (6) re-inspecting the weld. If porosity defects are still present, return to step (4) until flaw detection confirms the absence of porosity defects, thus completing the repair work. This invention can efficiently and effectively repair porosity defects (especially dense porosity defects) in U-rib internal welds.

The invention belongs to the field of straight seam submerged arc welding steel pipe radiographic inspection, particularly relates to a novel straight seam steel pipe end welding seam radiographic inspection detection system and detection method, and aims to solve the problem that the straight seam steel pipe end welding seam radiographic inspection efficiency is low. The novel straight seam steel pipe end welding seam radiographic inspection system comprises radiographic inspection detection devices arranged at the two ends of a to-be-detected steel pipe respectively, and each radiographic inspection detection device at the two ends comprises a ray emission system and a digital imaging plate imaging system which are matched with each other.

The present application belongs to the technical field of spiral submerged arc welding pipe, and particularly relates to a spiral submerged arc welding pipe suitable for hydrogen delivery and a manufacturing method thereof. The chemical element composition of the spiral submerged arc welding pipe suitable for hydrogen delivery is as follows in terms of percentage by weight: C: 0.03-0.06%, Si: 0.05-0.45%, Mn: 0.7-1.45%, S: ≤0.0015%, P: ≤0.008%, Ni: 0.01-0.3%, Cr: 0.01-0.3%, Cu: 0.001-0.15%, Nb: 0.02-0.06%, V: 0.002-0.05%, Ti: ≤0.03%, Mo: ≤0.001%, Al: ≤0.04%, B: ≤0.0003%, and the balance being Fe. The spiral submerged arc welding pipe has the characteristics of small and uniform grain size of pipe body and weld joint, low segregation, high dimensional accuracy of the welded pipe, excellent fracture toughness, excellent hydrogen-induced cracking resistance, small residual stress and the like, and can meet the requirements of hydrogen delivery of pure hydrogen and hydrogen mixed with 20% hydrogen and on-site girth welding butt joint at 6.3 MPa and below.

This invention provides a submerged arc welding wire suitable for high heat input welding of 50–200 kJ / cm and its application, belonging to the field of welding materials technology. The submerged arc welding wire provided by this invention comprises the following chemical composition: C: 0.04–0.10%, Si≤0.09%, Mn: 2.0–2.25%, P≤0.012%, S≤0.005%, Ni: 1.05–1.65%, Mo: 0.4–0.58%, Ti: 0.11–0.24%, Cr≤0.015%, Re≤0.030%, Al≤0.05%, Zr≤0.015%, (Pb+Sn+As+Sb+Bi)≤0.011%, and the balance Fe. The submerged arc welding wire provided by this invention meets the requirements for the mechanical properties of the deposited metal at a heat input of 50–200 kJ / cm, and is applicable to the production of large welded structural components and high-efficiency welding manufacturing.

The application discloses a matching submerged-arc welding wire for high manganese steel of an ultra-low-temperature liquid hydrogen storage tank, and chemical components of a core welding wire of the submerged-arc welding wire include the following in percentage by weight: C: 0.15%-0.30%, Si: 0.20%-0.50%, Mn: 20.0%-25.0%, Ni: 6.5%-8.5%, Cr: 1.8%-3.2%, Mo: 2.8%-4.5%, V: 0.03%-0.09%, N: 0.27%-0.44%, P: ≤0.012%, S: ≤0.008%, and the balance of Fe and inevitable impurities. The application has the advantages that the welding material matches the mechanical properties and low-temperature toughness of the high manganese steel base material, the tensile strength and ultra-low-temperature impact toughness are improved, the welding efficiency and the service safety of the storage tank are improved, and the cost of the liquid hydrogen storage tank is reduced.