1248 results about "Arc welding" patented technology

The invention discloses an automatic welding device for a rotary alloy furnace tube, and belongs to the technical field of arc welding equipment.The automatic welding device for the rotary alloy furnace tube comprises a base and a U-shaped bin located at the top of the base, and the two ends of the interior of the U-shaped bin are jointly provided with a centering clamping mechanism used for clamping the outer side of the furnace tube; a driving mechanism for providing power for the centering clamping mechanism to clamp the furnace tube is arranged on the outer side of the centering clamping mechanism, and a welding mechanism is arranged on the inner top of the U-shaped bin. A local sealing design is adopted for the inflation mechanism, the annular air bag is attached to the inner wall of the furnace tube after being inflated, an independent cavity communicated with the outside only through a welding seam gap is formed near the welding seam, the protection requirement can be met only by filling the local space with argon, the whole furnace tube or a large-range external space does not need to be filled, and compared with traditional overall argon filling, the argon filling efficiency is greatly improved. The argon consumption is greatly reduced, the industrial gas purchase cost is remarkably reduced, and the production cost investment is reduced.

The invention provides a swing control method based on molten pool oscillation multi-feature fusion and related equipment, and relates to the technical field of welding, the method comprises the steps that in the argon arc welding process, an electric arc signal and a molten pool oscillation signal of a variable wall thickness welding area are collected in real time; oscillation amplitude, main frequency characteristics, current fluctuation coefficients and voltage-current phase difference characteristics are extracted from the molten pool oscillation signals and the electric arc signals and combined, and an oscillation comprehensive characteristic matrix is obtained; inputting the oscillation comprehensive characteristic matrix into a pre-trained classification model, and identifying a current molten pool state type; a corresponding swing compensation strategy is matched according to the state type of the molten pool, and asymmetric swing parameters are generated; and the asymmetric swing parameters and a preset basic welding track are subjected to superposition operation, and a composite control instruction is generated to control a welding gun to execute asymmetric swing welding. By implementing the method, different abnormal states of different molten pools can be subjected to differential control, and the stability of the variable-wall-thickness welding process and the forming quality of a final weld joint are improved.

The invention relates to the technical field of pipeline splicing and welding, and discloses a rapid splicing and welding device for a large pipeline in a narrow space, which comprises a base, a butt joint assembly is arranged on the upper part of the base, a lower hoop plate is arranged on the outer surface of the butt joint assembly, and an upper hoop plate is arranged on the upper part of the lower hoop plate; an automatic electric arc welding mechanism is arranged in the driving assembly, the butt joint assembly comprises a support fixedly connected to the upper surface of the base, a lead screw is slidably inserted into the middle of the support in a penetrating mode, and the end of the lead screw is fixedly connected with the side edge of the lower hoop plate. The pipeline is locked through splicing of the upper hoop plate and the lower hoop plate, bidirectional extrusion force is generated through cooperation of the inclined butt joint groove and the butt joint block, the pipeline is synchronously held by the upper hoop plate and the lower hoop plate, after the ends of the hoop plates are aligned, the pipeline is accurately arranged in the circular hoop in a sleeved mode, misalignment caused by gravity sagging is effectively eliminated, concentric alignment of the welding ends is rapidly completed, and the welding efficiency is improved. And the assembly precision and efficiency are improved.

The invention relates to a low-power pulse laser-induced enhanced double-TIG (Tungsten Inert Gas) composite heat source medium-thickness plate narrow-gap efficient welding method, which adopts two independent TIG welding machines, a pulse laser and a wire feeder, and two TIG welding guns are positioned in a narrow-gap groove on the same side of a plane on which a laser beam perpendicular to the plate welding direction is positioned, the angle and distance of each heat source can be independently adjusted, before welding, the space angle and distance among the two TIG welding guns, laser beams and welding wires are adjusted, tungsten electrodes at the front ends of the two TIG welding guns and the laser beams emitted by a laser device are arranged in the corresponding space range, and a plate to be welded and the welding wires can obtain sufficient heat for melting, wetting and spreading; during welding, welding parameters are adjusted, the coupling plasma energy density in the narrow gap space range is controlled, and the droplet transition behavior of a welding wire and the flow characteristic of a molten pool are adjusted and controlled in real time. Compared with traditional arc welding, the welding process window can be improved, and the welding deposition efficiency is improved by more than 10 times.

The invention belongs to the field of argon arc welding devices, and particularly relates to an automatic device for circular tube butt-joint argon arc welding, which comprises a base, and a circular tube butt-joint positioning assembly is arranged on the base; the round pipe butt joint positioning assembly comprises a rotating plate rotationally arranged on one side of the upper end face of the base, two transverse moving columns are distributed on the upper end face of the rotating plate in a 90-degree array mode with the rotating shaft as the axis, the transverse moving columns are slidably connected to the rotating plate, and a connecting plate is fixedly connected to the upper end of the rotating plate. According to the round pipe butt joint device, automatic butt joint of round pipes is achieved through the round pipe butt joint positioning assembly, the round pipe feeding assembly, the orientation angle recognition assembly and the material moving assembly, the process that operators conduct manual butt joint on the round pipes is omitted, and the labor intensity is reduced. The orientation and the angle of the circular pipes are judged in a distance sensing mode, the two circular pipes are accurately adjusted to be at the proper angle, then it is guaranteed that the inclined faces of the two circular pipes are accurately attached, weld joint deviation is avoided, and therefore it is guaranteed that welding work is conducted smoothly.

The invention provides a positive and negative pressure pulse electric arc welding and additive manufacturing method which comprises the following steps: inducing electric arc plasma to generate a negative pressure electric arc with an anti-gravity adsorption effect through a current-magnetic field-hollow tungsten electrode-gas collaborative design, and forming a time sequence coupling process with a positive pressure electric arc. The core of the method is that a magnetic control positive pressure and negative pressure electric arc welding external field is cooperated with a molten pool reconstruction forming mechanism, that is, the dynamic and thermodynamic states of a molten pool are accurately balanced by dynamically switching the electric arc pressure direction and regulating and controlling the action proportion and alternating frequency of negative pressure and positive pressure electric arcs. A self-adaptive magnetic field threshold model based on current intensity and a gas mode is combined with variable polarity power supply parameters and gas flow rate cooperative control, and the problems of thin plate welding fusion penetration and thin-wall additive molten pool instability are effectively solved. According to the method, a welding wire, powder or laser composite manufacturing mode can be integrated, the forming precision and performance of a complex structure are remarkably improved, and an innovative technical support is provided for high-quality and high-efficiency welding and additive manufacturing.

The present invention relates to the technical field of hybrid laser welding devices, in particular to a hybrid laser arc welding system suitable for a complex welding structure, which is suitable for a complex welding structure, such as a welded part that is provided with multiple weld seams and multiple joints and meets requirements for multiple welding poses, and is suitable for batch welding thereof. The welding orientations for laser welding and arc welding do not need to be manually adjusted, which saves time and labor, facilitates and speeds up operations of adjustment and welding, and greatly improves the working efficiency. Also, it can be effectively ensured that the same welding condition and welding orientation are used for multiple weld seams, the accuracy is high, and after welding, the welding quality of a welded workpiece is ensured. Moreover, further provided is a hybrid laser welding method, which matches the described hybrid laser welding system, according to which, after adjustment to basic welding parameters is completed, subsequent welding of batch-welded members only needs to be adjusted on the basis of process requirements, and automated adjustment can be achieved, thus completing efficient and high-quality batch welding.

The invention provides an argon arc welding tungsten electrode appearance defect detection method and system and a storage medium, and relates to the technical field of tungsten electrode appearance detection.The method comprises the steps that firstly, a sample electrode with known defects is subjected to three-dimensional scanning and discretization into a plurality of space points, and each point is endowed with a defect existence mark; by applying a composite sine wave excitation current, an eddy current signal generated when a collector spirally passes through a detection coil at a constant speed is acquired, and laser ultrasonic scanning is synchronously utilized to acquire full-matrix data and reconstruct a three-dimensional gray model. And constructing a double-branch deep learning model, fusing the eddy current feature vector and the ultrasonic image block feature, and learning a mapping relationship between the eddy current feature vector and the defect mark. And performing the same detection on a to-be-detected electrode, outputting the defect confidence of each position by using the trained model, calculating a comprehensive quality index in combination with a preset defect severity weight and a spatial key region weight, and judging whether the electrode is qualified or not according to a qualified threshold value. According to the invention, high-precision, automatic and comprehensive detection of surface and internal defects is realized.

The invention discloses a method for performing visual inspection on surface forming quality characteristics of a welding seam by utilizing three-dimensional reconstruction, which comprises the following steps of: S1, performing uniform-speed scanning on the welding seam along the direction of a welding bead by using linear structured light emitted by a linear laser, and performing image acquisition on linear structured light stripes formed on the surface of the welding seam by using an industrial camera; s2, converting the acquired RGB image into a gray level image frame by frame, and carrying out image distortion correction and image denoising processing; s3, carrying out ROI (Region of Interest) positioning on the formed line structured light stripe image on the surface of the welding seam by adopting a pixel point gray level distribution calculation method; s4, carrying out image segmentation on the ROI region of the weld line structured light stripe image; and S5, carrying out sub-pixel-level center line extraction on the ROI of the weld line structured light stripe image by adopting a gray extreme value weighted centroid method. Automatic detection of welding seam forming quality characteristics such as laser welding and electric arc welding can be achieved, and the operation efficiency of a production line and the welding seam quality detection precision can be greatly improved.

The invention relates to the technical field of intelligent welding equipment, and discloses a metal product electric arc welding clamp which comprises a rack, a main workpiece fixing module, an auxiliary workpiece fixing module, a state sensing module and a control module, the main workpiece fixing module comprises a distance adjusting unit and at least two fixing parts, and each fixing part is composed of a lateral clamping unit and a top pressing unit. The main workpiece fixing module, the auxiliary workpiece fixing module, the state sensing module and the control module form an intelligent clamping system, a traditional passive rigid welding clamp is changed, a simplified thermal-mechanical coupling finite element model is constructed and operated in real time, the workpiece deformation trend and the stress state in the welding thermal process are accurately predicted, the force and the position of a clamping mechanism are actively adjusted in advance, and the welding quality is improved. The posture of the main station is continuously and stably maintained; therefore, the welding precision and consistency are improved, and the thermal deformation and residual stress of the workpiece are inhibited.

The invention provides an automatic wire feeding device of a gas shielded welding machine, which belongs to the technical field of electric arc welding equipment and comprises a wire feeding motor, a wire feeding wheel and a wire pressing wheel. Wherein a rotating frame is installed on the side, close to the wire incoming direction, of the output end of the wire feeding motor, a movable straightening wheel and two fixed straightening wheels are installed on the two sides of the center of the interior of the rotating frame respectively, the movable straightening wheel is located between the two fixed straightening wheels, and the rotating frame is arranged to be capable of rotating around the center of the wire guiding pipe. By arranging the rotating frame, the movable straightening wheel and the fixed straightening wheel, a drawn welding wire penetrates through the space between the movable straightening wheel and the fixed straightening wheel in the rotating frame before entering the wire feeding wheel, and the movable straightening wheel and the fixed straightening wheel exert pressure on the circumference of the welding wire along with rotation of the rotating frame; the bending of the welding wire in any direction of the whole circular section can be straightened, and unsmooth wire feeding caused by the fact that the tilting distance of the welding wire is too large is avoided.

To suppress a welding quality from deteriorating even if an arc-interruption occurs due to arc blow, in consumable electrode pulse arc welding.SOLUTION: In a consumable electrode pulse arc welding control method, in which a welding wire is fed at regular feeding speed and rising transition currents that rise from base currents to peak currents are distributed during a rising period of time, the peak currents are distributed during a peak period of time, falling transition currents that fall from the peak currents to the base currents are distributed during a falling period of time, the base currents are distributed during the base period of time, and welding currents Iw described above are repeatedly distributed in a first pulse period to perform welding, feeding speed Fw in an arc-interruption period of time at times of T13-t2 is set to be higher than the regular feeding speed at times of t1-t13.SELECTED DRAWING: Figure 2

The invention belongs to the field and particularly relates to an electric arc welding machine which comprises an electric arc welding device and a robot, the electric arc welding device comprises an electric arc welding gun and a control device which are installed at the execution end of the robot, and the control device comprises a main controller, a motion controller, a man-machine interaction module and a singular point avoiding system. In the process that the robot loads the arc welding gun to execute a welding task, singular points in a welding track are found and avoided through the singular point avoiding system. According to the electric arc welding machine, the singular point avoiding system is integrated in the control device, and the singular point avoiding system is used for discovering and avoiding singular points in a welding track in the process that the robot is loaded with the electric arc welding gun to execute a welding task. Therefore, continuous welding operation is effectively guaranteed, continuity and smoothness of the welding process are achieved, the quality problem caused by welding interruption is avoided, and whole-course intelligent welding is achieved.

The invention discloses electric arc welding equipment for machining an aluminum alloy door and window frame, and relates to the technical field of door and window machining. The device comprises a rack, a pressing device is fixedly installed on the rack, a welding device is installed on the pressing device in a sliding mode, an overturning assembly is fixedly installed on the rack, a fixing device and a locking assembly are installed on the overturning assembly, and an unlocking assembly is installed on the rack in a sliding mode. After the frame is clamped through the fixing device, the pressing device drives the welding device to move downwards to complete welding of the first side of the frame; the welding device continues to move to drive the overturning assembly to drive the fixing device to overturn, and after overturning, the locking assembly locks the overturning position; the pressing device drives the welding device to move reversely to complete second side welding; and finally, the downward pressing device lifts the welding device to be separated from the frame, meanwhile, the linkage unlocking assembly relieves locking, and the problems that existing equipment is difficult to automatically turn over, and manual operation is tedious and low in efficiency are solved.

The invention relates to the technical field of welding robots, and discloses large component gantry type robot welding equipment and a welding method.The large component gantry type robot welding equipment comprises a gantry rack, the gantry rack achieves X / Y / Z three-direction movement, and a six-axis robot is installed at the vertical moving end of the gantry rack; an electric arc welding gun, three-dimensional laser vision sensors, a grinding machine and a high-speed camera are installed at the tail end of the six-axis robot, and the two three-dimensional laser vision sensors correspond to the electric arc welding gun and the grinding machine correspondingly. A three-dimensional laser tracker is fixedly connected to the middle section of a cross beam of the gantry rack; a placing platform is arranged in the middle of the lower end of the gantry rack, a central controller is installed on the gantry rack, the central controller is connected with the gantry rack, the six-axis robot and the three-dimensional laser tracker through an EtherCAT bus, and the central controller carries a digital twin module, a welding expert database and a deformation prediction model. And manual welding is not needed, so that the working efficiency is improved.

A kind of method for melting pole twisted wire arc magnetic spin control welding.The prior art twisted wire welding is prone to produce blowhole in weld inside when large current welding, and excessive heat input will cause changes in structure and performance in joint area, such as problems of weld zone grain growth, joint plasticity, toughness and other mechanical properties decline, etc.The present application comprises: twisted wire welding electrode arc welding point, a coaxial coil is arranged around the twisted wire welding electrode arc welding point, direct current is passed into the coaxial coil to form longitudinal magnetic field, the force direction of longitudinal magnetic field on twisted wire welding arc should be consistent with the self-rotating direction of twisted wire welding arc, and opposite to the twisting direction of twisted wire, the direction of longitudinal magnetic field is controlled by the direction of direct current, while twisted wire melts to form its own twist angle release, the twist angle release is affected by Lorentz force to make the rotational angular velocity of twisted wire welding arc rapidly increase, to realize high-speed directional rotation of twisted wire welding arc.The present application is used for melting pole twisted wire arc magnetic spin control welding method.

Systems and methods described herein involve intaking sensor data associated with an arc weld from a robotic welding process, the sensor data involving thermal imaging data; executing a machine learning model on the sensor data, the machine learning model configured to output predicted internal parameters of a weld seam of the arc weld, predicted surface parameters of the weld seam of the arc weld, and a predicted quality of the arc weld associated with the predicted internal parameters and the predicted surface parameters; and modifying parameters of the robotic welding process of the arc weld based on the output predicted quality, the output predicted internal parameters, and the predicted surface parameters.

To obtain excellent welding quality by suppressing an increase in generation amount of spatters even when a short circuit occurs between a welding wire and a base material in consumable electrode pulse arc welding.SOLUTION: A feed speed Fw of a weld wire is set to a forward feed peak during a peak period from a time t2 to a time t3, and is set to a reverse feed peak during a base period from the time t4 to the time t52, and a start of the peak period at the time t41 is delayed until a short circuit between the weld wire and a base metal generated during the base period at the time t52 is released.SELECTED DRAWING: Figure 3

The invention provides a flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

The invention relates to the field of welding, in particular to a metal pipeline welding device which comprises a rotating table, a clamping assembly is arranged on the rotating table and used for clamping a flange welded to a pipeline, the pipeline is assembled on the flange, a welding assembly is arranged on one side of the rotating table and comprises a first air cylinder, and the output end of the first air cylinder is connected with a top plate. A gun body of electric arc welding equipment is arranged on the top plate, a base block is fixedly connected to the outer side wall of a gun barrel of the gun body, a rotating hole allowing the base block to deflect is formed in the end of the top plate, and the front end of the gun body extends to the connecting and welding position of a pipeline and a flange. According to the welding device, multi-layer welding is adopted, firstly, the sealing performance and the connecting strength between the flange and the pipeline can be effectively improved, the welding device can adapt to some severe environments and can resist media with higher flowing pressure, meanwhile, the welding device, the pipeline and the flange serve as moving parts and are matched with the rotating table, stable rotation can be achieved, and the gun body serves as a fixing part; and a moving part can be stably welded.

The invention discloses a multi-mode arc welding real-time quality evaluation system and method, and belongs to the technical field of intelligent welding quality control. The system comprises a distributed sensing array, an edge computing node and a dynamic quality mapping engine, wherein the distributed sensing array realizes multi-modal data synchronous acquisition through a high-frequency electric signal acquisition module, a molten pool thermal imaging module and an acoustic emission sensor array; gPU acceleration parallel processing is adopted by the edge computing nodes, an electric signal variable coefficient CV is extracted through a pulse cluster segmentation algorithm, and the main resonant frequency f0 of a molten pool is obtained by combining FFT frequency domain analysis; a dynamic quality mapping engine constructs a deep learning model containing a material-process knowledge graph, and real-time classification of defects such as pores, incomplete fusion and cracks is achieved. According to the method, the defect recognition accuracy is improved to 92.7%, the evaluation delay is compressed to be within 200 ms, the evaluation stability is high, and the method is suitable for precision welding quality monitoring in the fields of aerospace, new energy automobiles and the like.

The invention discloses a titanium and titanium alloy vacuum consumable electric arc furnace smelting method in the technical field of metallurgy. The titanium and titanium alloy vacuum consumable electric arc furnace smelting method comprises the following steps that an electrode block with the preset size and density is machined; an electrode bar formed by splicing the electrode blocks is put into a vacuum arc welding box to be vacuumized; argon is filled, argon filling is stopped when the preset pressure is reached, and standing is maintained for the preset duration; argon is continuously filled, the pressure in the welding box reaches a preset range, electrode bar welding is conducted, and cooling is conducted for a preset duration after electrode bar welding is completed; the welded electrode bar and the prepared auxiliary electrode are placed in a VAR furnace for butt welding, and the self-consuming machine after butt welding is cooled for a preset time length; primary smelting; carrying out secondary smelting; after the electrode blocks are spliced and placed in a vacuum arc welding box, argon with preset pressure is filled, and standing is carried out for preset time, so that it is guaranteed that the argon can penetrate into the electrodes, oxidation in the welding process is reduced, ingot inclusion is reduced, and the surface quality is improved.

The invention provides an assembly line system for building a B-type cabin middle group sheet body. The assembly line system comprises a feeding unit, a laser cleaning and scribing unit, a friction stir welding plate splicing unit, a ray detection unit, an assembling and welding unit and a discharging unit which are connected in sequence. During construction, the bottom plate plates for splicing the bottom plate are hoisted to an assembly line one by one, the laser cleaning and scribing unit is used for cleaning and polishing a welding bead and scribing various mounting line indication lines, then the friction stir welding plate splicing unit is used for carrying out butt joint on the bottom plate plates one by one according to a plate splicing sequence, and the bottom plate of a middle group sheet body is synthesized; a butt welding seam of a bottom plate is subjected to flaw detection of the ray detection unit and then flows to the assembling and welding unit, T rows and rib plates are subjected to falling assembly according to the positions of an installation line and an indication line through the assembling and welding unit, fillet weld arc welding is carried out after assembly is completed, and finally discharging of a whole middle-group sheet body is carried out through the discharging unit.

The invention discloses electric arc welding equipment and method for pin shaft machining, and relates to the technical field of pin shaft machining. The electric arc welding equipment and method for pin shaft machining comprise a welding bin, an electric arc welding device, a welding device and an electric arc welding device, and a placing base is assembled in the welding bin; the rotating part is assembled in the welding bin and is driven by a servo motor, and a movable welding head is assembled at the bottom of the rotating part; a first hydraulic bin connected with the oil pump is assembled in the welding bin. According to the electric arc welding equipment and method for pin shaft machining, a welding bin is opened, a to-be-welded pin shaft is placed in a placing base, an oil pump is driven, oil is introduced into a first hydraulic bin, a partition plate, a first spring, a first transmission rod, a second transmission rod, a sliding plate, a first elastic telescopic rod, a pressing plate, a rotating rod, a hinge rod and a gravity column are matched, and then a shaft base can be stably supported; and the other side of the shaft seat is prevented from tilting during welding, so that the welding effect of the device is improved.

The invention relates to the technical field of electric arc welding, and discloses an electric arc welding automatic wire feeding device for a numerically controlled lathe, which comprises a lathe main body, a feeder arranged at the top of the lathe main body, and a straightening mechanism arranged on one side close to a base of the feeder, the straightening mechanism comprises a shell, a motor arranged in the shell, a driving wheel arranged on an output shaft of the motor, an outer support arranged on the side, away from the motor, of the shell, a driven wheel arranged on the side, close to the driving wheel, of the outer support and an inner support arranged on the inner side of the outer support, the cylinder is arranged at the end, close to the driven wheel, of the inner support, and the three guide holes are formed in the side, close to the driven wheel, of the inner support in an annular array. The straightening mechanism is arranged, the welding wires are straightened from multiple angles in a surrounding rotation mode, the welding wires are gradually recovered to be in a linear state in the advancing process, different moving distances are preset for the pressing rollers, and rapid switching is facilitated to adapt to the welding wires with different diameters.

The utility model relates to the technical field of welding machines, and discloses a gas shielded welding machine for corner bracket production, which comprises a movable seat, a welding machine main body is arranged at the top of the movable seat, and an adjustable push handle positioned on the left side of the welding machine main body is arranged at the top of the movable seat. A welding gun pipeline assembly located on the right side of the welding machine body and connected with the welding machine body is arranged at the top of the movable base. According to the gas shielded welding machine for corner bracket production, by arranging a welding gun pipeline assembly and a protection assembly, firstly, a threaded rod is rotated to drive a protection frame to move upwards, so that a winding roller is opened, a worker can wind a pipeline outside the winding roller at the moment, and the welding gun pipeline is clamped in a U-shaped clamping seat at the moment; and at the moment, a fastening bolt is screwed off to fasten and limit the welding gun pipeline, then the purpose of winding and unwinding the pipeline can be achieved, then a threaded rod is rotated to drive a protection frame to move downwards to protect the pipeline, the practicability of the device is improved, and the device is convenient to use by workers.

A method for controlling pulse arc welding involving feeding a welding wire and applying a welding current by repeating a pulse cycle including: a peak rising period of applying a peak rising current increasing from a base current to a peak current; a peak period of applying the peak current; a peak falling period of applying a peak falling current decreasing from the peak current to the base current; and a base period of applying the base current. The feed speed of the welding wire is changed such that it beings to change from a reverse-feeding peak value toward a forward-feeding peak value at a point earlier by a first preceding period than the start of the peak rising period. Then, the feed speed reaches the forward-feeding peak value at a point earlier than an end of the peak rising period, and beings to change from the forward-feeding peak value toward the reverse-feeding peak value at a point earlier by a second preceding period than the start of the peak falling period, and reaches the reverse-feeding peak value at a point earlier than an end of the peak falling period.

The invention relates to the technical field of surfacing, in particular to a high-toughness wear-resistant martensitic stainless steel flux-cored wire and a surfacing method thereof. According to the welding wire, a tubular structure containing Cr-Mo-Ni-V (-Nb) alloy powder wrapped by a low-carbon 13Cr steel belt is adopted, low-heat-input multi-layer submerged-arc welding and 550-560 DEG C postweld heat treatment are matched, a surfacing layer obtains a tempered martensite matrix and a dispersed carbide structure, the hardness reaches 52-56 HRC, the dilution rate is smaller than or equal to 15%, high abrasion resistance, corrosion resistance and hot crack resistance are achieved, and the room-temperature impact energy is 25-28 J.

The invention discloses a welding power supply extension module integrating arc voltage tracking and welding machine control functions and a welding control method, and belongs to the technical field of electric arc welding. In order to solve the problems that arc voltage tracking and welding machine control are mutually independent and cannot cooperate in real time in the existing TIG welding process, so that the welding process is tedious in operation and unstable in quality, the system comprises a core processor for executing an arc voltage tracking control algorithm and a welding parameter adjusting algorithm; the signal conditioning circuit is used for collecting and conditioning a current signal and a voltage signal output by the welding power supply; the welding power supply control module is provided with a plurality of interface circuits used for being connected with welding power supplies of different interface types; the core processor receives state information of the welding process through the high-speed communication module and generates a first control instruction used for adjusting output parameters of a welding power source and a second control instruction used for adjusting the height of a welding gun according to the state information and current signals and voltage signals collected by the signal conditioning circuit. The method is used for electric arc welding.

The invention discloses a multi-angle welding tool for welding a cylindrical shell of a petroleum separator, relates to the technical field of petroleum machining equipment, and provides the following scheme that the multi-angle welding tool comprises a welding gun body, and further comprises supporting mechanisms arranged at the two ends of the whole tool and used for carrying out balanced supporting on the two ends of the welding position in the cylindrical shell of the petroleum separator to be welded; the transverse welding mechanism is arranged between the two supporting mechanisms and used for driving the welding gun body to move transversely. Longitudinal and circumferential welding seam welding can be independently completed, arc welding seam welding can also be cooperatively achieved, the distance between the welding gun body and a welding point can be accurately adjusted, shells with different diameters and lengths can be adapted, the whole set of tool does not need to be replaced, pressure feedback of an extrusion sensing block is matched, the inner wall of the shell can be clamped in a self-adaptive mode, and it is guaranteed that a welding area is horizontal and free of displacement; dislocation weld defects are reduced, movement errors of the welding gun body are controlled, weld forming uniformity is guaranteed, and the problems of undercut and incomplete fusion are avoided.