136 results about "Weld pool" patented technology

The invention provides an intelligent real-time detection method and system for PCCP welding quality, and relates to the technical field of online detection and intelligent evaluation of pipeline welding quality through machine learning. Light energy data and multi-light-source images of a spiral weld pool are collected, exposure parameters are dynamically adjusted through the energy difference of visible light near-infrared bands, and the real-time detection of the PCCP welding quality is achieved. Inhibiting strong light interference and generating a weld surface image; a stress concentration area is positioned by scanning a welding seam thermal deformation area and combining speckle pattern change, sound frequency change and the elastic characteristic of the thin-wall steel cylinder; inputting the surface image and the deformation data into a space-time convolutional neural network, fusing light energy change, image details and spatial features to construct a weld joint space structure diagram, and adaptively correcting the position of a sensor; and comparing the sinking depth of the three-dimensional point cloud reconstruction, analyzing the correlation between the sinking degree and the stress, and generating a probability thermodynamic diagram to output the pressure-bearing failure risk level, so that the probabilistic early warning of the pressure-bearing failure risk can be realized.

The invention provides a narrow gap swing laser welding pool wettability prediction method based on CFD simulation. The method comprises the following steps that an interaction platform is constructed through Python + PyQt5, and geometric modeling, UDF compiling and a material library module are integrated; the groove parameters and the swing track are dynamically loaded to a Fluent solver, and a full-coupling transient model of a steam recoil pressure-buoyancy-molten drop mass source item is established; in CFD-POST, the widest section of the molten pool is positioned on the basis of the contour surface with the volume fraction being 0.5, and Z-direction displacement-flow velocity data are extracted along the two side wall surfaces; fusing defects are predicted through double criteria of a bilateral average flow velocity difference threshold value and F test variance homogeneity; according to the method, dynamic quantitative evaluation of wetting behaviors can be achieved, the process development period is shortened, the defect detection rate is increased, and the method is suitable for aerospace thick plate welding quality control.

According to the pipeline all-position robot intelligent welding system and method based on the AI algorithm, a laser vision scanning system is adopted for scanning a pipeline welding seam / groove, and an AI intelligent model generating system generates a pipeline all-position welding seam three-dimensional model diagram based on scanning data; the AI intelligent process generation system intelligently reads welding seam size information based on the model diagram, generates a welding gun path of all-position welding, optimizes the welding gun path, matches initial welding parameters and distributes the initial welding parameters to the intelligent welding robot, and the AI intelligent process optimization system predicts a welding seam molten pool in the welding execution process and judges whether the process is qualified or not. And if the process is unqualified, welding parameter adjustment is repeated, and if the process is qualified, process parameter optimization values are output. The welding quality of all-position welding of small and medium-diameter pipelines is accurately controlled, and the all-position welding quality of the pipelines is improved; and the system intelligently adapts to the complex environment of all-position welding of small and medium-diameter pipelines, and can cope with complex welding process changes in real time.

According to the filler wire welding method based on the composite laser, the first laser beam and the second laser beam which are different in wavelength can be irradiated to the welding seam of the to-be-welded aluminum alloy workpiece through the composite laser welding head, and light spots, acting on the to-be-welded aluminum alloy workpiece, of the two laser beams partially coincide or do not coincide; the two light spots are distributed front and back in the welding direction. When the light spot of the first laser beam is in the front and the light spot of the second laser beam is in the rear, the first laser beam can be used for preheating, so that the welding wire melting efficiency can be improved, the reflectivity of aluminum alloy to the second laser beam is reduced, and welding seam forming is improved. When the light spot of the first laser beam is in the rear and the light spot of the second laser beam is in the front, the first laser beam can be used for slowly cooling a welding pool / performing post-heat treatment on a welding seam, so that welding defects are reduced. It can be seen that the welding quality of the to-be-welded aluminum alloy workpiece is improved by means of characteristic cooperation and function complementation between the two kinds of lasers of different wave bands.

The invention discloses high-strength steel laser wire filling welding equipment and method based on AI intelligent identification, and belongs to the field of laser welding and artificial intelligence. Comprising a laser wire filling welding system, a robot control system loaded with a laser wire filling welding head, an element analysis and vision and distance measurement system integrated on the laser wire filling welding head, an online detection system loaded with a CNN training model and a PLC real-time feedback system. Laser wire filling welding is carried out through the laser wire filling welding system and the robot control system, meanwhile, whether an AlSi coating exists on the surface of a high-strength steel plate or not and the appearance of a plate butt joint gap and a welding pool are obtained through the element analysis and vision and distance measurement system, and data are transmitted to the on-line detection system to be analyzed; and then an analysis result is fed back to a laser wire filling welding system through a real-time feedback system, so that the wire feeding type and the wire feeding speed of a wire feeding system are changed, and wire feeding parameters are modified in situ.

The invention relates to the technical field of welding equipment, in particular to train maintenance welding equipment which comprises a guide mounting column, and further comprises an adaptive adjustment welding mechanism arranged on one side of a driving mounting disc; the adjusting drainage mechanism is movably arranged on the guide mounting column, and the adjusting drainage mechanism comprises a displacement adjusting module and a drainage module. The equipment is compact in structure, can be conveniently mounted on an external loading device, and flexibly enters a high position and a deep position which are difficult to reach in train maintenance; the spatial position and the dip angle of the welding nozzle are cooperatively adjusted through the multiple driving telescopic columns, a welding pool and heat input can be precisely controlled, and the welding seam forming quality is guaranteed; the functions of environment pretreatment and real-time purification are integrated, combustible dust can be removed in advance, smoke dust is efficiently pumped out through negative pressure during welding, and clear sight is guaranteed through supplementary lighting; the air supply module and the power supply module are integrated in the guide column, the structure is regular, and operation is stable and reliable.

This invention provides a laser welding machine for repairing galvanized steel pipes, relating to the field of laser welding machine technology. It includes a welding station and a laser welding torch, the laser welding torch being movable on the welding station. The machine also includes a butt clamping mechanism, a welding pool, a pre-weld treatment mechanism, and a gas flow treatment mechanism. Two clamping platforms are slidably connected to the welding station, and these platforms can drive the galvanized steel pipe to rotate. The welding pool is located on the welding station between the two clamping platforms. The pre-weld treatment mechanism can perform grinding pre-treatment on the area of ​​the galvanized steel pipe to be welded. The gas flow treatment mechanism consists of clamping arm assembly one and clamping arm assembly two, rotatably connected to both sides of the pre-weld treatment mechanism. During welding, clamping arm assembly one and clamping arm assembly two can clamp the welding position of the galvanized steel pipe and use gas flow to carry away zinc vapor from the molten pool. This solves the technical problem in related technologies where zinc metal on the surface of galvanized steel pipes evaporates into zinc vapor during welding, affecting welding quality.

The application provides a welding molten pool monitoring system and method, the system comprises: an input module for obtaining a to-be-processed welding image according to a selected welding image input source; a processing module for selecting a matched welding information recognition model, inputting the to-be-processed welding image into the welding information recognition model, obtaining a welding molten pool recognition result, processing the welding molten pool recognition result by using a preset parameter algorithm to obtain a molten pool detection parameter; and an output module for pushing the molten pool detection parameter to a user. The application can obtain a to-be-processed welding image from a selected welding image input source, select a matched welding information recognition model for image recognition, process the image recognition result to obtain a molten pool detection parameter to monitor the welding effect, and has better applicability and deployment convenience.

The invention provides a high-temperature alloy laser welding process parameter prediction method, terminal equipment and a medium. The method comprises the steps that workpiece attributes of a to-be-welded alloy workpiece are obtained; collecting a welding pool image in real time, and extracting a length-width ratio time sequence of the welding pool from the welding pool image; inputting the workpiece attributes and the length-width ratio time sequence of the molten pool into a pre-trained process parameter prediction model, and outputting a welding process parameter prediction value by the process parameter prediction model; and the to-be-welded alloy workpiece is welded according to the welding process parameter predicted value. The problems that in the prior art, parameters of a high-temperature alloy laser welding process are not accurately set, and real-time self-adaptive adjustment cannot be achieved can be solved, and the welding quality is improved.

This invention provides a method, terminal equipment, and medium for predicting process parameters in high-temperature alloy laser welding. The method includes: acquiring the workpiece properties of the alloy workpiece to be welded; acquiring a real-time image of the weld pool and extracting a time series sequence of the weld pool aspect ratio from the image; inputting the workpiece properties and the time series sequence of the weld pool aspect ratio into a pre-trained process parameter prediction model, which outputs predicted values ​​of the welding process parameters; and welding the alloy workpiece according to the predicted values ​​of the welding process parameters. This invention solves the problems of inaccurate setting of process parameters and inability to adaptively adjust them in real time in existing high-temperature alloy laser welding technologies, thereby improving welding quality.

The invention relates to the technical field of electro-gas welding, and particularly discloses a double-wire electro-gas welding method which comprises the following steps: arranging a butt joint seam between a first welding part and a second welding part; the rear side of the butt joint seam is blocked; direct current positive connection is conducted on a first welding wire, direct current reverse connection is conducted on a second welding wire, the first welding wire and the second welding wire are both arranged in a butt joint seam, and the first welding wire is located on the rear side of the second welding wire; and the first welding wire and the second welding wire are controlled to synchronously and periodically swing in the front-back direction and synchronously move upwards. According to the double-wire electro-gas welding method, groove machining is not needed, the stability of a welding pool is improved, and the welding quality is guaranteed.

The invention discloses an automobile auxiliary frame welding method for reducing welding spatter through ultrasonic assistance. The automobile auxiliary frame welding method aims at solving the problems that spatter is serious and quality is not stable in a traditional welding process. The method comprises the steps that in the process of welding the automobile auxiliary frame, ultrasonic vibration is synchronously applied to a welding area; the core is that the ultrasonic vibration is started at the same time as or before the start of the welding current and is stopped after the stop of the welding current, and the generation of spatter is physically suppressed by the acoustic streaming effect and / or cavitation effect generated in the welding pool. Compared with the prior art, through real-time synchronous coupling of the ultrasonic and welding processes, welding spatter can be reduced by 70% or above, meanwhile, welding seam forming is improved, the grain structure is refined, an online monitoring and feedback control system can be integrated, and the welding quality, the production efficiency and the automation level are remarkably improved.

The application provides a 650MPa-grade ultra-supercritical high-temperature steel welding electrode and a coating and deposited metal, and belongs to the field of welding materials.The raw material of the coating comprises, in weight parts, 39-43 parts of magnesia, 30-35 parts of fluorite, 3-5 parts of dolomite, 5-10 parts of ferrosilicon, 2-5 parts of sodium titanate, 10-15 parts of metallic chromium powder, 0.1-0.4 parts of chromium oxide green, 0.1-0.3 parts of aluminum-magnesium alloy and 1.5-2.5 parts of sodium alginate.Through the research on the composition of the coating, the sodium titanate and the aluminum-magnesium alloy are added to stabilize the electric arc, the electric arc has stability and concentration when high-current welding is performed, the weld pool temperature is moderate, the fluidity of the molten iron is moderate, the electric arc blowing force is stable and concentrated, and the welding operation performance is good.

The invention relates to the technical field of strength of gas shield welding joints, in particular to a method for improving the strength of a gas shield welding joint, steel plate welding is completed in the mode of folding back welding at the plate seam position of two steel plates, a lining is arranged below the welding position of the two steel plates, and a welding groove is formed in the position, at the plate seam position of the two steel plates, of the lining. The welding starting position is on the steel plate on one side, welding is conducted in the plate seam direction, welding is conducted on the steel plate on the other side across the plate seam, the distances between welding pools passing through plate seam gaps in the plate seam turning-back process are the same, and welding seam forced water cooling points are arranged at the positions, 10-30 mm away from the welding pools, behind the welding pools. The method has the beneficial effects that the problem that the joint strength is reduced due to softening generated in a heat affected zone in the gas shielded welding process of high-strength steel is solved, the strength of a weld joint softening zone is improved, and the joint strength is larger than that of base metal.

Welding machine (10) for welding a workpiece (12), comprising: an energy source (14) for generating a melt pool (18) in a zone of a workpiece (12); a device (32) for filling material comprising a nozzle (34); an aperture plate (300) comprising a body with an opening (302); and an optic (24) arranged such that it focuses a beam (16) from the energy source (14) through the opening (302) onto the zone of the workpiece (12), the body of the aperture plate (300) further comprises: a first end (304); a second end (306) opposite the first end (304); a planar first surface (308) that runs between the first and second ends (304, 306); and a concave second surface (312) opposite the first surface (308), which begins at the first end (304) at a height (H3) and then slopes towards the first surface (306), so that the aperture plate (300) tapers towards the second end (306) and the concave second surface (312) directs the reflection of the beam (38) away from the nozzle (34) to prevent the reflection (40) from affecting the nozzle (34).

The invention provides a self-adaptive laser hybrid welding single-face welding double-face forming method. The method comprises the following steps that 1, steel plates are assembled in a butt joint mode; 2, the position of locating laser is adjusted, and the distance between the laser end face and the workpiece surface is adjusted to a safe position; 3, the welding mode of the welding machine is a welding mode except pulse welding; 4, adjusting the power of the laser; 5, adjusting the diameter of a laser spot; 6, adjusting the focal length of the light spot and the distance between the light spot and the arc; 7, the welding current is controlled to range from 200 A to 330 A, and the welding speed ranges from 1.5 M / min to 2.8 M / min; and 8, the welding speed and locating are controlled through a robot, the electric arc is in front of the laser, or the laser and an electric arc welding pool are arranged behind the laser, and single-face welding and double-face forming of steel plate laser hybrid welding are achieved. According to the method, the rapid and high-quality welding process of the 4-28 mm medium-thickness plate is achieved, accurate positioning of the welding point position in the welding process is achieved, adaptability is higher, the welding speed is increased, and meanwhile the internal quality and surface forming of a welding seam are improved.

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 application belongs to the field of laser welding equipment, and particularly relates to a laser welding platform for metal plates, which is aimed at the problem that the existing technology cannot adapt to different welding angles of different plates and welding pools are prone to problems, and provides a laser welding platform for metal plates, which comprises a platform main body, a support installed on the platform main body, a laser welding assembly capable of adjusting an angle installed at the upper end of the support, and a welding table matched with the welding assembly installed on the inner side of the support; the welding table is in a multi-prism structure, the plane of the edge of the welding table is used as a welding operation surface, and two welding pieces to be welded are placed on two welding operation surfaces with different angles to realize welding of the two welding pieces at different angles, so that the clamping requirements of different shapes of metal plates can be met without replacing a clamp, a heating unit is arranged between the two sets of welding tables to heat the welding pieces, welding stress is effectively reduced, internal gas is promoted to escape, and defects such as pores and cracks are avoided.

The invention discloses a laser welding closed-loop control method and device based on visual guidance and molten pool monitoring, electronic equipment and a readable storage medium, and relates to the technical field of welding. The method comprises the steps that molten pool state scanning data and welding process radiation data are obtained; and positioning a welding product of welding equipment through a preset welding track obtained based on pre-welding product positioning scanning data, obtaining a current welding state through the molten pool state scanning data and the welding process radiation data, and adjusting welding parameters of the welding equipment on line through the current welding state. The method has the effects that the positioning precision of the pre-welding track is improved, and welding parameters are adjusted in time through analysis of welding pool state scanning data in combination with welding process radiation data.

According to the ultra-narrow gap laser hybrid welding method, laser beams are arranged in three rows, the middle row of laser beams is located in the center of a welding seam, the edges of grooves in the left side and the right side of the welding seam are each provided with a row of laser beams, in the welding process, the effective action width of the laser beams is controlled to be 6 mm, and two welding wires are symmetrically arranged on the left side and the right side of a narrow gap groove in a positive defocusing mode; the feeding position of a welding wire is located at the position 5-10 mm in front of a laser beam, and when the plate thickness T is smaller than or equal to 20 mm, the welding speed of 300-500 mm / min is adopted; and when the plate thickness T is larger than 20 mm, the welding speed of 100-300 mm / min is adopted, and a welding pool is protected through two paths of collaborative conveying protective gas. A multi-light-spot power-adjustable laser system, a double-wire cooperative feeding mechanism and a multi-path gas protection scheme are fused, and an efficient and stable narrow-gap welding technology system is constructed. And a series of problems such as incomplete fusion of the side wall of the welding groove, incomplete fusion of the center of the welding seam and defect of air holes of the welding seam which cause unqualified mechanical properties of the welding seam metal are effectively solved.

A metal inert gas arc welding process in which a multi-wire welding torch (40) is mechanized along a path to execute a predetermined weld seam on a workpiece (32, 100a, 100b, 101a, 101b), and in which a first arc (51) is generated between a first consumable wire electrode (50) and the workpiece, and a second arc (61) is generated between a second consumable wire electrode (60) and the workpiece to transfer wire electrode material into a weld pool, wherein the first wire electrode (50) is supplied by a first power source (4) and the second wire electrode (60) by a second power source (6), and at least a third wire (70) is fed directly into the weld pool, wherein the first and second wire electrodes (50, 60) and the third wire (70) are guided in the multi-wire welding torch (40) such that the wires exiting the multi-wire welding torch (40) (50, 60,70) essentially lie in a common plane (GE) and that in the common plane the first wire electrode (50) and the second wire electrode (60) form an angle of equal magnitude with opposite signs to the third wire (70), characterized in that, during the execution of the metal inert gas arc welding process, starting from a predetermined direction of movement of the multi-wire welding torch (40) to the path line, the multi-wire welding torch (40) is moved backwards on the path line without rotation of the multi-wire welding torch (40) to perform a reversal of movement, and with the beginning of the backward movement of the multi-wire welding torch (40), the third wire (70) is initially not fed into the weld pool, and thereafter, in a transition phase, a current source (5) of the third wire (70) is supplied starting from a predetermined initial operating value of at least one process parameter current,Voltage and feed rate are controlled to a predetermined steady-state operating value of at least one process parameter.

The present application relates to the technical field of welding process, disclose a kind of laser electric arc composite welding weld penetration control method and system, the method includes: based on the infrared thermal radiation signal of welding pool constructs pool three-dimensional temperature field;Based on the specific element spectral line intensity of the plasma optical spectrum signal in the welding pool, the pool metal vapor concentration is calibrated;The pool three-dimensional temperature field and the pool metal vapor concentration are coupled analysis, and the pool state characteristics of the welding pool are obtained;Based on the pool state characteristics dynamic division laser-arc energy distribution ratio;Based on the laser-arc energy distribution ratio, the offset position of laser focal point in weld depth direction is adjusted, and the arc voltage waveform is adjusted by inverter power supply;The present application can improve the efficiency of a kind of laser electric arc composite welding weld penetration control.

The utility model provides a battery and energy storage equipment, and relates to the technical field of energy storage, a shell of the battery comprises an upper cover, a side wall and a bottom wall, the side wall comprises a folded edge located at the end, close to the upper cover, of the side wall, the folded edge extends towards one side of an inner cavity of the shell, the upper cover and the folded edge are stacked, and the side wall is welded to the upper cover through the folded edge. The side wall of the battery is welded with the upper cover through the folded edge, so that when the battery is in thermal runaway, even if the side wall is deformed due to large acting force, the folded edge and the upper cover can still be kept in a laminated and attached state, and the direction of force borne by a welding pool formed by welding the folded edge and the upper cover is still consistent with the extending direction of the folded edge; therefore, a welding pool of the folded edge and the upper cover can be prevented from being subjected to shear stress, and the welding pool formed by welding the upper cover and the folded edge is prevented from cracking or breaking, so that the safety performance of the battery is improved, and the risk of combustion or explosion of the battery is reduced.

The embodiment of the invention provides a welding quality detection method and device, equipment and a medium, and the method comprises the steps: selecting a video frame of which the keyhole feature meets a preset collection requirement from a plurality of video frames based on the keyhole features respectively contained in the plurality of video frames in a welding video stream collected in a battery welding process, and taking the selected video frame as a target video frame; for any target video frame, generating a feature vector for the target video frame based on a keyhole feature contained in the target video frame and a parameter value of a currently adopted welding process parameter; inputting the feature vector into a penetration depth detection model obtained by pre-training, and obtaining the weld pool depth in the target video frame output by the penetration depth detection model; and generating a welding quality detection result based on the depth of the molten pool in each target video frame. And the accuracy of welding quality detection is improved.

The invention discloses a stainless steel welding rod coated with a water-soluble semi-inorganic paint film and used for silicon steel sheet welding and a preparation method and application of the stainless steel welding rod, and belongs to the technical field of welding materials. The problem that high air hole sensitivity of a silicon steel sheet coated with a paint film in the welding process is not reduced at present is solved. The welding rod comprises a core wire and a coating, coating powder comprises marble, fluorite, rare earth oxide, rutile, titanium dioxide, quartz, ferrosilicon, electrolytic manganese, chromium metal, nickel powder, sodium carbonate and iron powder, the coating powder and pure sodium water glass are mixed, the core wire is coated with the mixture, and the stainless steel welding rod is obtained. According to the invention, F decomposed from CaF2 is combined with H to generate HF, and the HF is diffused into air to reduce the hydrogen content in a welding seam and reduce the generation of hydrogen pores; and meanwhile, in a welding pool area, the rare earth oxide adsorbs residual hydrogen, the pore sensitivity is reduced through the synergistic effect of the rare earth oxide and the residual hydrogen, deposited metal has good mechanical performance, and the flux-cored wire is used for welding a silicon steel sheet coated with a water-soluble semi-inorganic paint film and stainless steel.

The invention discloses an OCT penetration detection light beam position correction method for static welding and a welding method, and belongs to the technical field of laser welding. On the basis of determining a welding path and a laser welding process, a weld pool keyhole position test is carried out on a weld track, and position compensation coordinates corresponding to at least part of welding spot light beams are determined; a position correction file of the detection light beam is obtained according to position compensation coordinate fitting analysis, and then position correction of the OCT penetration detection light beam under static welding is completed. The OCT fusion depth detection light beam position correction method for static welding is simple in step and convenient to operate, compensation correction of the action position of the detection light beam relative to the position of the processing light beam can be accurately achieved, conditions are provided for accurate control over the position of the detection light beam in the static welding process, and the working efficiency is improved. Accurate measurement of the laser welding fusion depth in the static welding process is achieved, the workpiece static welding quality is guaranteed, the workpiece machining efficiency and quality are improved, and good economic benefits are achieved.

The invention relates to the technical field of material science and engineering, in particular to TiC-WC composite particles with density matching and neutral buoyancy characteristics and a preparation method of the TiC-WC composite particles. The TiC-WC-Ni / Ni-Co composite particle comprises a composite particle body composed of TiC, WC and a Ni / Ni-Co adhesive, the overall bulk density is controlled to be 7.5-8.5 g / cm < 3 >, fine-grained and coarse-grained particles are applied separately through a dual-granularity application strategy module, and the interface bonding performance is improved by means of a metallurgical wettability enhancing module. The method has the beneficial effects that according to the technical scheme, the problem of uneven distribution of hard phases in a welding pool is solved by accurately regulating and controlling the density of the composite particles, uniform suspension of the particles is ensured, meanwhile, the erosive wear resistance and mechanical impact resistance of a welding layer are improved, and the method is suitable for flux-cored wire filling and surfacing pool putting scenes; and the method has excellent performance stability and process controllability.

The application discloses a kind of welding quality online detection weld mark device and method, when welding actual structural member, the welding current of same time of welding torch, the visual information of weld pool that camera is collected to welding voltage signal and real-time transmission to the welding defect online detection neural network carried on control system, if the certainty percentage of the result of existence welding defect in predicted output is higher than set threshold, then record the mark signal including picture of welding defect, the number of welding defect, corresponding welding parameter of welding defect, defect type of welding defect and the certainty percentage of the result of existence welding defect;Control system starts laser and laser head, and laser head carries out laser marking at the position of welding defect.The application carries out accurate marking according to mark signal at the position of welding defect, effectively improves the applicability of welding quality online detection system in actual production and the precision and work efficiency of welding inspection link.

The application discloses a kind of pyrolysis furnace tube welding devices, including machine base;Two furnace pipe chuck, for fixed butt joint and rotate two furnace pipes, are set on machine base;Welder, centrally arranged on machine base can be moved and weld the joint of two furnace pipes to form weld;Heater is provided on the machine base: it is arranged between two furnace pipe chuck, for step-by-step cooling weld;The heater includes two heating pipe sleeves symmetrically arranged on the machine base, and the heating pipe sleeve is coaxially arranged with the furnace pipe chuck, and a plurality of heating fins are provided in the heating pipe sleeve.The application forms a plurality of heat zones by adopting heater partition heating furnace pipe wall, which produces temperature difference along the welding rotation direction of furnace pipe, and makes weld pool pass through the plurality of heat zones with decreasing temperature in turn, so that the weld can be controlled to cool step by step during the welding process of furnace pipe, to prevent the generation of welding cracks caused by too fast cooling speed.

The invention provides a close-range double-molten-pool one-time forming welding method which comprises the following steps: when a groove welding seam between a first workpiece and a second workpiece is welded, arranging a close-range double-molten-pool welding gun capable of movably working along the length direction of the welding seam, and one-time forming welding of a groove welding seam between the first workpiece and the second workpiece is completed through a close-range double-molten-pool welding gun. According to the protective gas hood of the short-distance double-molten-pool welding gun, during welding, the protective gas hood covers a welding arc, and during welding of a first contact tube and a second contact tube, a welding wire passing path and electric conduction are provided; and the magnetic conductive spacer is used for reducing double-arc interference during welding. According to the close-range double-molten-pool one-time forming welding method, the welding efficiency is high, bottoming welding and cosmetic welding can be achieved at the same time, heat input of a bottoming welding pool and heat input of a cosmetic welding pool are dispersed, and the welding defects such as welding missing and welding penetration caused by too large heat input in the same area can be avoided.