816 results about "Weld line" patented technology

A method of joining a first work-piece to a second work-piece is provided. Each of the first work-piece and the second work-piece include a top surface, an opposed bottom surface, and a side surface connecting the top surface and the opposed bottom surface. In one aspect, the method includes positioning the side surface of the first work-piece adjacent to the side surface of the second work-piece, and advancing a friction stir additive manufacturing tool across the top surface of the first work-piece and the top surface of the second work-piece along a weld line between the first work-piece and the second work-piece. As the friction stir additive manufacturing tool advances along the weld line, a filler material is deposited along the weld line and into a plurality of through holes formed in either or both of the first work-piece and the second work-piece. Each of the plurality of through holes includes a first opening on the top surface, a second opening on the opposed bottom surface, and a passageway through the work-piece between the first opening and the second opening. The method further includes joining the first work-piece and the second work-piece together.

A friction stir additive welding device configured to join a first work-piece and second work-piece is provided. In one aspect, the device includes a nosecone having a sidewall extending from a first end to a second end, a channel extending from the first end to the second end along a longitudinal axis of the nosecone, and a screw positioned within the channel. The first end is configured to couple the nosecone to a robotic arm and the second end has a surface configured to be advanced along a weld line between the first and second work-pieces. A central axis of the screw defines an angle that is less than 90 degrees relative to a plane that is perpendicular to surfaces of the first and second work-pieces as the surface of the nosecone advances along the weld line.

A friction stir additive manufacturing device configured to join a first work-piece and a second work-piece is provided. In one aspect, the device includes a rotating spindle configured to deposit a filler material over a weld line as the device is advanced along an interface between the first work-piece and the second work-piece. The device also includes a deposition head configured to receive at least a portion of the spindle, the deposition head configured to remain stationary relative to the rotating spindle. The deposition head includes a first semi-cylindrical portion having an inner radius and an outer radius relative to a first axis, and a second semi-cylindrical portion having an inner radius and an outer radius relative to a second axis that is perpendicular to the first axis. The second semi-cylindrical portion can include a chamfered inner surface configured to define a weld profile.

The invention relates to a rib plate welding seam identification method, a storage medium and a computer system.The rib plate point cloud of a workpiece is firstly obtained, a welding seam area is determined, then the mass center of the welding seam area is searched for, downsampling is conducted, and each optimized rib plate point cloud is obtained; on this basis, the rib plate point clouds can be divided into single-class rib plate point clouds and multi-class rib plate point clouds according to the number of the end points of each rib plate point cloud in the step S3, in the subsequent step S4, only one welding seam straight line can be obtained through fitting in the single-class rib plate point clouds, and multiple welding seam straight lines can be obtained through fitting in the multi-class rib plate point clouds; according to the method, redundant welding line straight lines can be prevented from being mistakenly extracted from single-class rib plate point clouds, and essential welding line straight lines can be prevented from being missed from being extracted from multi-class rib plate point clouds, so that the accuracy and precision of the welding line straight lines are improved; on this basis, the step S5 determines the end points of each weld straight line as the start-stop point and the end point of the weld, and a weld line segment is obtained.

The invention discloses an intelligent welding control system and method based on multiple sensors and electronic equipment, and belongs to the technical field of automatic welding, the system comprises a sensing layer, a decision-making layer and an execution layer, through cooperative work of a front laser vision sensor, a rear laser vision sensor and a molten pool image sensor, a groove three-dimensional model can be accurately established before welding, and the welding precision is improved. And dynamic information of the molten pool is continuously collected in the welding process, a dual monitoring mechanism for the geometric characteristics of the welding line and the state of the molten pool is formed, and multi-source data collection and fusion in the whole welding process are achieved. The control method comprises the steps of pre-scanning modeling, feedforward parameter planning, real-time feedback adjustment of a molten pool, data fusion optimization and the like, and high-precision self-adaptive control over welding parameters is achieved by combining deep learning and the Kalman filtering technology. According to the method, the welding adaptability, the control precision and the intelligent level can be remarkably improved, and the method is suitable for high-precision welding scenes such as pipelines, pressure containers and steel structures and has remarkable engineering application value and popularization prospects.

A friction stir additive manufacturing device configured to join a first work-piece and a second work-piece is provided. In one aspect, the device includes a rotating spindle configured to deposit a filler material over a weld line as the device is advanced along an interface between the first work-piece and the second work-piece. The device also includes a deposition head configured to receive at least a portion of the spindle, the deposition head configured to remain stationary relative to the rotating spindle. The deposition head includes a first semi-cylindrical portion having an inner radius and an outer radius relative to a first axis, and a second semi-cylindrical portion having an inner radius and an outer radius relative to a second axis that is perpendicular to the first axis. The second semi-cylindrical portion can include a chamfered inner surface configured to define a weld profile.

A method of joining a first work-piece to a second work-piece is provided. Each of the first work-piece and the second work-piece include a top surface, an opposed bottom surface, and a side surface connecting the top surface and the opposed bottom surface. In one aspect, the method includes positioning the side surface of the first work-piece adjacent to the side surface of the second work-piece, and advancing a friction stir additive manufacturing tool across the top surface of the first work-piece and the top surface of the second work-piece along a weld line between the first work-piece and the second work-piece. As the friction stir additive manufacturing tool advances along the weld line, a filler material is deposited along the weld line and into a plurality of through holes formed in either or both of the first work-piece and the second work-piece. Each of the plurality of through holes includes a first opening on the top surface, a second opening on the opposed bottom surface, and a passageway through the work-piece between the first opening and the second opening. The method further includes joining the first work-piece and the second work-piece together.

The invention relates to the technical field of batteries, and particularly provides a battery shell and a battery comprising the same. The battery shell comprises a shell body, the shell body comprises at least two oppositely-arranged first side faces and at least two oppositely-arranged second side faces, and the area of the first side faces is larger than that of the second side faces; the first side surface and the second side surface surround to form an accommodating cavity and form an upper opening part and a lower opening part, the first side surface or the second side surface forms an interface end, and the interface end is welded to form a first welding wire; the adjacent first side face and second side face are connected through a transition part, the transition part and the surface where the first welding line is located form a boundary line, the first welding line deviates from a first center line, perpendicular to the direction of the opening part, of the surface where the first welding line is located, and the distance a between the first welding line and the nearest boundary line is larger than or equal to 1 mm and smaller than or equal to 50 mm. The transition part is located in the edge corner area, the structure is stable, the welding wire is close to the transition part, the strength is high, deformation of the battery shell cannot be caused during welding, and the forming yield of the battery shell is increased.

The invention discloses 5G antenna welding equipment which comprises a bearing device used for bearing a to-be-processed substrate with a signal line to sequentially flow through a chip mounting station, a conductive column welding station, a cooling fin assembling station and a circuit board welding station; the radio frequency chip mounting device is arranged at the chip mounting station and is used for mounting a radio frequency chip on the substrate; the conductive column welding device is arranged at the conductive column welding station and is used for welding a conductive column on the substrate so as to enable the radio frequency chip and the conductive column to form circuit connection; the cooling fin assembling device is arranged at the cooling fin assembling station and is used for mounting cooling fins on the substrate; and the circuit board welding device is arranged at the circuit board welding station and is used for welding a circuit board on the conductive column so as to obtain the 5G antenna. According to the invention, chip mounting, conductive column welding, cooling fin assembling, circuit board welding and other operations are completed in sequence in a limited operation space, and the problem of poor precision caused by mounting and welding offset of each structure in a 5G antenna is solved.

The invention discloses an automatic discharging device of a welding line, belongs to the technical field of advanced manufacturing, and aims to solve the problems that an existing device is low in installation efficiency, and the safety risk of a working place is increased due to reduction of the suction force of a suction cup. The automatic discharging device of the welding line comprises a vertical frame, a conveying belt is arranged on the vertical frame, a transferring device is arranged on the vertical frame in a sliding mode, a driving mechanism can drive the transferring device to move in the transverse axis direction of the vertical frame, the transferring device is located above the conveying belt and the containing platform, and a controller is arranged in the transferring device. Assembling and disassembling can be rapidly completed, the overhauling efficiency and the working efficiency are improved, meanwhile, air can be compressed to blow the surfaces of products, fine dust particles on the surfaces of the products are effectively removed, it is ensured that the suction cups and the surfaces of the products are well sealed, and then the adsorption effect is improved.

The invention relates to an X-ray weld defect intelligent detection method based on weld line perception and reversible domain mapping, which comprises the following steps: collecting a gray X-ray image of a weld region, and carrying out joint labeling on a weld center line track and a defect mask to construct a standardized training data set; designing a weld line sensing hybrid neural network architecture; performing end-to-end training on the network by using a joint loss function formed by detection task loss and center line consistency constraint to realize collaborative optimization of defect category discrimination and spatial positioning; and deploying the trained model in an automatic welding quality detection system, performing forward reasoning on X-ray images acquired in real time, and continuously outputting defect detection results with accurate category, position and form information in combination with a post-processing strategy of weld direction clustering. According to the invention, stable and accurate identification of slender and weak-texture weld defects under the condition of bent welds is realized, and automation and reliability of nondestructive detection of welds are remarkably improved.

The invention relates to the technical field of welding, in particular to a welding method. According to the method provided by the invention, when the length of the wire harness is less than or equal to 500mm and the second end and the second terminal of the wire harness are welded, the first end of the wire harness is slightly influenced by vibration, and the tension value of the first terminal at the first end and the wire harness is reduced, so that after the welding parameters are adjusted, on one hand, the welding tension effect of the second end is reduced; on the other hand, vibration generated during welding is reduced, so that damage to the welding position of the first end is reduced, and tension values of the front end and the rear end can be balanced. In addition, the first end of the wire harness welded with the first terminal is clamped in the welding process, so that vibration generated when the second end of the wire harness is welded is counteracted by the clamping mechanism, propagation of the vibration to the first end is greatly reduced, and the influence on the first end is reduced.

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

The invention discloses a construction method of a building steel structure project, which relates to the technical field of steel structures and comprises the following steps of material preparation, arrangement before construction, steel structure preheating, welding energy control, evaluation of heat absorbed by a weld joint in unit length by using a welding heat input algorithm, comprehensive evaluation, and construction of the steel structure project after welding is completed. The welding seam quality is evaluated by utilizing a comprehensive evaluation algorithm and combining welding line energy to obtain a welding seam score and welding seam finishing, the welding seam preheating temperature can be adjusted according to different steel properties and welding modes, the accuracy of the welding seam preheating temperature is guaranteed, different influence factors are introduced into a welding heat input algorithm, and the welding quality is improved. And in a comprehensive evaluation algorithm, factors such as the cooling speed of the welding line, the welding line energy and the welding line area are combined for evaluation, the unified standard of welding line quality evaluation is achieved, and the effect of improving the overall quality of a steel structure project is achieved.

The invention provides a welding device for assembling an electric guitar, and relates to the technical field of welding. The welding device for assembling the electric guitar comprises an erecting chassis, four sets of clamping motors are fixedly connected to the inner side of the erecting chassis, the output ends of the clamping motors are fixedly connected with clamping threaded rods, the outer surfaces of the clamping threaded rods are in threaded connection with a transverse moving frame, the upper end of the transverse moving frame is fixedly connected with a limiting frame, and the lower end of the limiting frame is fixedly connected with a corner motor; the output end of the corner motor is fixedly connected with a corner frame, the corner frame is rotationally connected to the inner side of the limiting frame, and the upper end of the corner frame is fixedly connected with a feeding compensation motor. According to the welding device for assembling the electric guitar, the clamping plate is arranged for clamping and erecting the assembly mainboard, and the welding mechanism is arranged for welding below the assembly mainboard, so that the assembly mainboard does not need to be overturned in the welding process, and a welded circuit is not pulled and broken; the problem that when the assembly mainboard is welded, the lower space is small, overturning is needed, and a circuit is prone to being pulled apart is solved.

Corrosion protection is provided to an interior surface of a process vessel by welding a metal band to the interior surface of the process vessel while first and second metal overlay sections are joined to the interior surface of the process vessel such that opposed end regions of the first and second overlay sections are adjacent to one another and are positioned over the metal band. A weld line section is formed by welding the opposed end regions of the overly sections to one another and to the metal band. The weld line section is then covered with a metal seal strip which is itself welded to each of the opposed end regions of the overlay sections.

The invention relates to the technical field of magnesium alloy material processing, in particular to a magnetic pulse generation cast-rolling casting nozzle with a solidification structure regulation effect, which comprises a casting nozzle main body unit, a transmission unit and a magnetic pulse generation unit. The motor drives the coil box to move to the position close to the roller along the guide rail, so that a pulse electromagnetic field generated by the coil accurately acts on the solidification front edge; a plurality of positioning grooves are formed in the coil box, the coil can be divided into a middle coil and an edge coil, pulse electromagnetic fields are generated by utilizing currents with different intensities and frequencies at the edge and the middle, a solidification structure generates an induced magnetic field and is subjected to the action of Lorentz force, structure exchange is formed, and the consistency of the temperatures of the middle and the edges of a cast-rolling area is guaranteed; therefore, the shape of the cast-rolling solidification welding line is regulated and controlled. The method can promote nucleation at the solidification front edge, effectively refine the solidification structure, reduce macrosegregation, improve the problem of non-uniform cooling of the casting-rolling middle part and the casting-rolling edge part and effectively inhibit magnesium alloy casting-rolling edge cracks, and has important application value in the casting-rolling field.

The invention relates to the technical field of friction welding machines, and discloses a friction welding machine sliding table control method and device.The method comprises the following steps that movement data of a friction welding machine stirring head are collected in real time, and a stirring head kinetic model is established; based on the mobile data and the dynamic model, outputting a preliminary control strategy through an optimal linear quadratic regulation control algorithm; on the basis of the movement data, future movement data of the stirring head are predicted through a prediction control algorithm, and a preliminary control strategy is optimized; a control signal is sent to a servo motor of the sliding table to control the servo motor; and the difference between the real-time movement data of the stirring head and the prediction result is used as feedback data, and control strategy parameters are adjusted. According to the method, the difference between the real-time movement data of the stirring head and the prediction result is used as feedback, a closed-loop control mechanism is formed, and control parameters are continuously monitored and optimized. The position control precision of the stirring head is improved, the problem of response lag in high-speed welding is effectively solved, the consistency of welding line tracks is ensured, and position deviation is avoided.

The utility model discloses a foldable fire welding bucket, and belongs to the technical field of fire welding buckets. In order to solve the problem that an existing product is complex in structure, the following technical scheme is provided, the device comprises a fixing frame, a mounting plate is arranged at the rear end of the fixing frame, a rotating column is fixedly connected to the rear end of the fixing frame, the rotating column penetrates into the mounting plate and is rotationally connected with the mounting plate, and an adjusting mechanism is arranged in the mounting plate. By arranging the adjusting mechanism, the horizontal angle of the fire receiving bucket can be manually adjusted, when a welding line is inclined, the fire receiving bucket can still receive sparks at different heights, splashing can be effectively prevented, and the practicability of the fire receiving bucket and the construction safety are improved to a great extent; the expansion angle of the fire receiving bucket can be adjusted and fixed, the angle can be properly adjusted according to the distance difference of splashing sparks caused by different welding devices, and the fire receiving bucket is convenient to use.

The invention belongs to the technical field of injection molding, and provides an injection molding part weld line eliminating method, electronic equipment and a storage medium, and the method comprises the steps that an injection mold simulation model of an injection molding part is constructed, and the injection mold simulation model is provided with a simulation air channel; modifying the airway data of the simulation airway to obtain a modified simulation model; performing injection molding based on the modified simulation model to obtain an injection molding part simulation result; modifying the air channel data of the injection mold based on the simulation result of the injection molding part to obtain a modified injection molding simulation mold; and based on the corrected injection molding simulation mold, obtaining an injection molding part without weld lines. According to the method, the updated simulation model can be obtained by modifying the airway data of the simulation airway of the simulation model, and the airway data of the injection mold is further modified according to the simulation result of the injection molding part, so that the generation of weld lines can be reduced or eliminated, errors and low efficiency caused by artificial experience data are reduced, the efficiency is improved, and the cost is reduced. And the product quality of the injection molded part is ensured.

The utility model discloses an automatic junction box production line which comprises a diode spot welding mechanism, a tin sheet pasting hot melting mechanism, a punching and riveting mechanism, a wire harness assembling mechanism and a wire buckle assembling mechanism, the diode spot welding mechanism is used for welding a diode and a copper sheet, the tin sheet pasting hot melting mechanism is used for hot melting a tin sheet on the copper sheet, and the punching and riveting mechanism is used for punching and riveting the tin sheet on the copper sheet. The punching and riveting mechanism is used for punching a copper sheet and riveting the copper sheet and a junction box shell, the wire harness assembling mechanism is used for riveting a wire harness and the copper sheet and welding a wire pressing block and the junction box shell, and the wire buckle assembling mechanism is used for assembling a wire buckle to the outer side of the wire harness. According to the utility model, the diode spot welding mechanism, the tin sheet pasting hot melting mechanism, the punching and riveting mechanism, the wire harness assembling mechanism and the wire buckle assembling mechanism are arranged, so that the automatic assembling production of the junction box is realized, the production efficiency is greatly improved, the labor cost is reduced, and a plurality of detectors are arranged, so that the production quality of the junction box is ensured.

Disclosed handheld welding devices include: an energy storage device; power conversion circuitry configured to convert input power from the energy storage device to output welding power; a wire feeder configured to deliver welding wire and / or a gas valve configured to control flow of gas from a gas source; a front assembly configured to conduct the welding power to a welding electrode, wherein the front assembly is swappable between two or more of a wire-fed welding process, a stick welding process, or a tungsten electrode welding process; control circuitry configured to control the power conversion circuitry and the at least one of the wire feeder or the gas valve based on the configured one of the two or more welding processes, to selectively provide the welding power and at least one of the welding wire or the gas to the front assembly in response to an input device; and a housing.

The invention discloses butt welding equipment for electric vehicle hub production, which belongs to the technical field of welding and comprises a workbench, a forming cylinder, a guide column and a welding gun. A working face is arranged on the surface of the workbench and used for placing a plate as a basic blank for forming the hub outer frame. The forming cylinder is arranged above the workbench, and the arc surface of the forming cylinder serves as a forming surface, so that a plate is tightly attached and bent into an annular body. The two guide columns form pressure applying tracks on the two sides of the forming cylinder and move along the arc face, a plate is bent and attached to the surface of the forming cylinder, and the two ends of the plate are connected to form a welding line. And the end part of the welding gun can move along the welding line to finish welding. A plurality of adsorption openings communicated with the air suction channel are formed in the surface of the forming cylinder, adsorption force is applied to the plate, and movement or dislocation is prevented. A sealing ring is arranged on the periphery of the adsorption opening to improve sealing performance. A supporting plate and a ventilation hole are arranged in the adsorption opening, the structure of an air suction channel is optimized, the air suction efficiency is improved, and uniform distribution of adsorption force is ensured.

Provided is a thick steel plate which combines high strength, low yield ratio and high toughness, and which has excellent toughness at the joint even when subjected to high heat input welding in which the welding heat input exceeds 40 kJ / mm. A thick steel plate having a prescribed component composition and microstructure, and having an Mn concentration distribution in which the area fraction of an average Mn concentration region defined as a region having an Mn concentration of 0.9-1.1 times the average Mn content (mass%) is less than 90%; the area fraction of an Mn-rich region defined as a region having an Mn concentration of 1.15 times or more of the average Mn content (mass%) is 1.0% or more, the average circle-equivalent diameter of the Mn-rich region is 7.0 [mu] m or less, and the Charpy absorption energy vE0 at 0 DEG C is 70 J or more.

The invention discloses a weld ROI segmentation method based on active and passive vision fusion. The method comprises the following steps: synchronously acquiring a two-dimensional image and a three-dimensional point cloud of the surface of a welded workpiece; inputting the trained deep learning network, and outputting a weld joint candidate region and a pixel-level mask graph thereof; establishing a cross-modal mapping relation through geometric calibration, and projecting the three-dimensional point cloud to a two-dimensional image to complete registration and fusion; cutting from the three-dimensional point cloud by using a cross-modal mapping relation to obtain a candidate point cloud region; generating a gray matrix for ray odd-even discrimination according to the pixel-level mask pattern; and each point of the candidate point cloud is projected to a pixel coordinate point by point, ray odd-even discrimination is carried out on the projection points according to the gray matrix, the points conforming to an odd-even rule are determined as welding line points and are aggregated into a welding line ROI point cloud, and the welding line ROI point cloud is output as a segmentation result. According to the method, the adaptive capacity to the unstructured welding seam is effectively improved, the point cloud processing complexity is reduced, and good real-time performance and robustness are achieved.

The invention relates to an inner cavity curved surface welding line laser light path turning welding method which is used for solving the technical problem that an existing welding method is difficult to operate when curved surface welding is carried out in an inner cavity, and the method comprises the steps that a reflecting mirror is arranged on a light emitting path of a laser welding head, and original laser beams are deflected; the laser beam enters the inner cavity space and irradiates the to-be-welded area of the curved surface weld joint; surface cleaning and fixing are conducted on a to-be-welded area, and the folded laser beams are focused to the center of a welding seam; enabling the laser beam to perform scanning welding on the curved surface welding seam according to a preset scanning track; in the welding process, protective gas is jetted to the position, acting on the workpiece, of the laser beam so as to blow away welding spatter and provide gas protection for a welding seam. The propagation direction of laser beams is changed through the reflecting mirror, so that laser can enter the inner cavity to weld a curved surface weld joint, the application range of laser welding is expanded, and the problem that curved surface welding is difficult to operate in the inner cavity space through an existing welding method is solved.

The invention relates to the technical field of laser welding, and provides a high-speed laser welding wire box process based on multi-beam synergy, which comprises the following steps: step 1, at least three laser beams are adopted as a synergy composite heat source, a main laser beam is responsible for penetration fusion welding, and an auxiliary laser beam is responsible for preheating, post-heating or molten pool stabilization; when the copper-aluminum dissimilar material is welded, an auxiliary laser beam is switched into a green laser; and 2, assembling a multi-beam optical regulation and control unit comprising a diffractive optical element, a quartz field lens and a galvanometer scanning module, splitting a main beam into one main beam and two auxiliary beams through the diffractive optical element, controlling focal depth fluctuation by the quartz field lens, and realizing accurate movement positioning of a laser beam by the galvanometer scanning module. Through integration of multi-beam collaborative design and an intelligent control unit, remarkable breakthroughs are achieved in the aspects of welding efficiency, quality consistency and process adaptability, firstly, in the aspect of efficiency and process, the welding speed is greatly increased, multi-station synchronous operation of an automatic welding unit is matched, and the welding period of a single-line box is remarkably shortened.

To provide a manufacturing method for a molded vehicle ceiling that stabilizes a quality of end processing in the molded vehicle ceiling, reduces a thermal management burden on workers in an end processing, and allows workers to work more safely.SOLUTION: A manufacturing method for a molded ceiling by terminating a periphery of an opening 12 of the molded ceiling 10 includes: a placing step of placing the molded ceiling 10 on a base 20; a folding step of folding an edge part 15 so as to fit a back surface 10b of the molded ceiling 10 by a bending piece 23 functioning as a first ultrasonic horn; a pressing step of pressing the edge part 15 toward a receiving part 21a of the base 20 by a first tip part 24 so that the bent edge part 15 and the back surface 10b of the molded ceiling 10 are in close contact with each other; and a first welding step in which the edge part 15 pressed by the first tip part 24 and the back surface 10b of the molded ceiling 10 are ultrasonically welded via the first tip part 24 to form a welded rolled part 14.SELECTED DRAWING: Figure 7

The invention relates to a welding seam gap measuring method, a medium and equipment, and the method comprises the steps: obtaining a workpiece contour point cloud of a to-be-welded workpiece, determining a welding seam region, traversing all points in the welding seam region, obtaining a plurality of similar points of a current point, and obtaining a plurality of chords corresponding to the current point according to all the similar points; and calculating the distance between each point in the welding line area and all corresponding chords, obtaining an accumulated point chord value of all points, obtaining an extreme point corresponding to the accumulated point chord value, taking the extreme point as an end point of the welding line gap, and obtaining a welding line gap value according to the distance between the welding line end points and the prior workpiece thickness. The problems that in the prior art, special-shaped welding seams cannot be recognized in real time, the welding seam recognition efficiency is low, and reliability is insufficient are solved.

To stably maintain a weld state even if a temperature of a base material rises when the base material is aluminum or an alloy thereof in a double shield TIG welding method.SOLUTION: In a double shield TIG welding method that uses a welding torch comprising an inner nozzle for ejecting an inner gas and an outer nozzle for ejecting an outer gas, and performs welding while generating an arc on a weld line, the weld line is divided into a plurality of sections, a flow rate Fi of the inner gas is set for each of a first section from time t3 to t4, a second section from time t4 to t5, and a third section from time t5 to t6.SELECTED DRAWING: Figure 2