271results about How to "Improve welding quality" patented technology

The invention discloses a novel automatic welding device of a reinforcing cage forming machine. The automatic welding device comprises a movable rotating disk rack provided with longitudinal ribs, a mounting arm, and a welding position regulating mechanism driving the mounting arm to move vertically and horizontally, wherein one end of the mounting arm is installed on one lateral face of the movable rotating disk rack in a sliding mode, the other end of the mounting arm is located on one side of the front face of the movable rotating disk rack and provided with a mounting shaft, a mounting seat is hinged to the mounting shaft, and a press plate, a welding gun, idler wheels, a press plate and welding gun position regulating mechanism, an idler wheel regulating mechanism and a mounting seat rotating regulating mechanism are installed on the mounting seat. The novel automatic welding device of the reinforcing cage forming machine has the advantages that the idler wheel regulating device can achieve regulating of different positions and different angles; the press plate and the welding gun synchronously rotate along with rotating of a reinforcing cage and direct at the intersection point of stirrups and longitudinal ribs of the reinforcing cage, and automatic welding is performed; the novel automatic welding device of the reinforcing cage forming machine has the advantages of being high in production efficiency and welding quality, simple in structure, convenient to maintain, stable in work and low in cost.

When a laser beam is irradiated from a laser welding torch onto a surface of a welding target workpiece, a plasma is generated. This plasma is introduced to an optical fiber, extracted by a filter-added half-silvered mirror, branched by half-silvered mirrors and a reflecting mirror, split by a bandpass filter, and detected by an optical sensor. Using a detection result of the optical sensor, a control for keeping the intensity or the temperature of a plasma beam constant is exercised.

In a battery pack in which multiple battery cells are arranged in one or multiple rows in an electrically insulating case and an electrode of each battery cell is coupled to an electrode of another battery cell through a connecting metallic plate, the connecting metallic plate made of copper is disposed on a positive electrode of each battery cell and on a negative electrode of another battery cell to form a lap joint, and a weld is formed in each of one predetermined position on the connecting metallic plate 3 above the positive electrode and another predetermined position on the connecting metallic plate above the negative electrode by applying arc spot welding. The depth h of weld penetration in the weld is greater than the thickness T1 of the connecting metallic plate and smaller than the thickness T1 plus the thickness T2 of the positive electrode or the negative electrode, that is, T1<h≦(T1+T2×4/5).

The invention discloses an all-position automatic welding system, mainly comprising a welding machine head module, a central controller, a welding power supply module, a power adapter and a remote control operation module, wherein the welding machine head module transmits the position information of a current welding torch to the central controller; the central controller carries out operation processing on the data; the central controller gives a corresponding welding instruction according to the result of the current position operation processing; and the power adapter controls the output of the welding power supply according to the welding instruction of the central controller and obtains a driving signal to control the movement of the welding torch, and the real-time control on the welding seam tracking process is realized. Corresponding welding specifications are automatically matched according to the different positions of the welding torch in the welding process; the position of the welding torch relative to the welding seam is detected in an online manner in the welding process, so that the automatic welding seam tracking of the welding torch is realized; and the welding quality is high, the speed is high, efficient automatic welding equipment for field long-distance transport pipeline is realized, and the all-position automatic welding system is adaptive to various field environments.

The invention relates to a full-automatic welding workbench for pole lugs and caps of cylindrical batteries. The full-automatic welding workbench is characterized by comprising a machine base and a rotary workbench body arranged on the machine base; the rotary workbench body is driven to rotate by a servo motor arranged in the machine base; a plurality of jigs for storing cell shells are uniformly arranged on the inner side of the circumference of the rotary workbench body in the radial direction; the outer side of the circumference of the rotary workbench body is sequentially provided with a cell shell feeding unit, a pole lug leveling unit, a pole lug cleaning unit, a pole lug wiping unit, a cap feeding unit, a galvanometer laser welding unit, a tensile test unit and a discharging unit in the rotating direction; and a plurality of procedures such as feeding, leveling, cleaning, wiping, welding, testing and discharging are completed through cooperation of all the units. According to the full-automatic welding workbench, the automation degree is high, meanwhile, the labor cost is reduced, and the welding quality and the production efficiency are greatly improved.

The invention relates to a multi-sensor feedback wire feed method. In the method, a sensor and a control system are additionally arranged on the basis of an original and classical wire feeder so as to provide a scheme for adjusting the electric arc height, and the like through acquiring, transmitting, analyzing and adjusting real-time data transmitted by a welding wire. The method can be suitable for various welding environments, and particularly, the adaptability to a specific environment which cannot be reached by manual work to adjust a welding wire feed system is greatly enhanced. The real-time monitoring and timely adjustment ensure that the utilization rate of the welding wire is greatly improved, and the welding quality is indirectly improved.

An anti-deformation assistive tool for welding thin-wall box bodies comprises an inner fixing frame and an outer clamp. The inner fixing frame comprises a box body, movable pressing blocks and adjusting bolts. Two adjacent faces of the box body are respectively connected with one movable pressing plate through the adjusting bolts, and by means of adjusting the adjusting bolts, relative distance between the movable pressing blocks and connecting faces of the box body where the movable pressing blocks are located can be adjusted. The two movable pressing blocks and the other two faces of the box body jointly form supporting for two lateral walls of the inner cavity of a thin-wall box body. The outer clamp comprises a cramp frame and a movable handle pressing bolt, the cramp frame is clamped outside two opposite lateral walls of the thin-wall box body, the movable handle pressing bolt is connected on one clamping finger of the cramp frame, a bolt head part of the movable handle pressing bolt is pressed on the lateral wall of the thin-wall box body. The anti-deformation assistive tool for welding the thin-wall box bodies utilizes the adjustable supporting to fix shape and position of the inner cavity in the box body, enables size of a supporting face and the size of the inner cavity of the box body to be consistent through the adjusting bolts, and then utilizes the external clamping, thereby enabling the box body to be stable in structure, effectively reducing deformation during welding, overcoming the shortcomings that in the prior art, only external clamping is utilized, and deformation of shape dimension contracting during cooling after welding can not be controlled, and welding quality of products is improved.

The invention relates to a magnetic control resistance spot-welding method and a magnetic control resistance spot-welding device. The method comprises the following steps that: 1) when a magnetic control system is in a startup state or a reset state, a synchronization system continuously detects switching-on and switching-off as well as the intensity of welding current of a resistance spot-welding gun through a first current sensor and judges whether the resistance spot-welding gun has current or not; if the resistance spot-welding gun has the current, a step 3) is executed; and otherwise, a step 2) is executed; 2) the synchronization system sends a switching-off digital signal 00 to a power conversion device to keep the switching-off state of the power conversion device, and returns to the step 1), and the like. The device comprises the synchronization system, the power conversion device, an upper excitation winding, a lower excitation winding, the resistance spot-welding gun, the first current sensor and a second current sensor. Compared with the prior art, the method and the device have the advantages that: an external magnetic field and the welding current can be controlled coordinately, the comprehensive mechanical performance of a resistance spot-welding head can be improved effectively, the applicability range is wide, and the like.

The invention provides an output control method of welding source. In melting electrode arc welding power, the expected external characteristic and inductance are electrically formed, thereby improving the welding quality. The external characteristic functional circuit (ERF) is built-in with a plurality of external characteristics, takes welding current detection signal (id) as input to output the output voltage setting signal (Er) of the welding power. The inductance setting circuit (LR) outputs the inductance setting signal (Lr) for setting the appropriate inductance of the welding power. The current setting variation calculating circuit (DIR) takes the output voltage setting signal (Er), welding voltage detection signal (vd) and inductance setting signal (Lr) as the input to output that current setting variation signal delta Ir=(Er-vd)/Lr. The current setting integrating circuit (IIR) integrates the current setting variation signal (delta Ir) and calculates the welding current control setting signal (Irc). The welding current (i) is output and controlled according to the welding current control setting signal (Irc).

The invention discloses underwater pulse laser welding method and device for an ocean platform. The underwater pulse laser welding device for an ocean platform comprises an ocean platform on which a laser is arranged; the side wall at the middle part of the ocean platform is transversely provided with a manipulator below which a laser welding head is arranged, and the inner part of the laser welding head forms a hollow cavity; and the laser is connected with the laser welding head through a transmission optical fiber. A pulse laser is fixedly mounted on the ocean platform, laser beams are output and conducted into the laser welding head by using a plurality of transmission optical fibers, the laser welding head is positioned and controlled to operate by the manipulator so as to adjust the pulse parameters of laser and reasonably select the output energy of the laser. The invention has the advantage of realizing automatic underwater unmanned welding, is beneficial to guaranteeing the position accuracy, the welding quality, the reliability of construction and the realization of automatic welding and improving the production efficiency.

The invention provides an orbit of a gas shielded welding automatic welding trolley in an offshore steel structure, which is a circular orbit formed by the abutting joint of a semicircular upper half orbit and a semicircular lower half orbit. The upper half orbit and the lower half orbit are respectively a compound guiding orbit comprising guiding orbits at two circular sides and a transmission orbit between the guiding orbits, screw holes are respectively arranged in gaps between the transmission orbit and the guiding orbits at both sides for the threaded connection and the fixation of a magnetic bracket and the orbits. A working mode of gear transmission is adopted so that the automatic welding trolley makes circular motion around a welded piling pipe along the orbit and has good motion stability and high welding quality. The invention has the efficacy of simple and light structure, convenient mounting, rapid and accurate positioning and deformation resistance in use.

The invention discloses a method for welding a pile leg and a pile shoe of a drill platform. The pile shoe comprises a pile shoe main body and an upright plate component. The method comprises the following steps of: a) welding the upright plate component on the pile leg; b) inserting the upright plate component connected with the pile leg into the pile shoe main body, and c) welding the upright plate component inside the pile shoe main body. The method of the invention solves the problem that the exterior of the pile shoe is difficult to weld because the working station space is narrow. The welding quality is ensured, the welding cost is saved and the construction period is shortened.

The invention relates to an automatic assembly welding device used for welding an auxiliary material on a workpiece. The automatic assembly welding device comprises a rotation mechanism, carriers, a material pressure mechanism, a loading manipulator, a taking and placing manipulator, a welding manipulator and a conveying mechanism; the rotation mechanism is composed of a bracket, a first power component arranged on the bracket and a rotary platform which is connected with the first power component; the rotary platform is provided with a first work station and a second work station which can both correspond to the loading manipulator and the welding manipulator; and the carriers are used for clamping the workpiece and are installed on the first work station and the second work station. By adopting the automatic assembly welding device, under the action of the material pressure mechanism, rapid and accurate attaching between the auxiliary material and the workpiece can be realized, and the welding quality of the auxiliary material and the workpiece is improved; and meanwhile, the first power component drives the rotary platform to rotate, so that the loading manipulator, the taking and placing manipulator, the material pressure mechanism and the welding manipulator are ensured to carry out coordinated and orderly work, the middle wait time is eliminated, and the welding efficiency and quality of the automatic-assembly welding device are improved.

The invention relates to a clamping welding machine head which comprises a cylinder, a holddown spring, a pressure sensor, a displacement sensor, two electrodes, a horizontal clamping machine frame, a draw rod, a feedback plate, two balancing springs, two brackets and two sliding blocks, wherein the clamping machine frame is provided with a guide rail; the two sliding blocks are respectively connected on the guide rail in a sliding mode; the two brackets are respectively connected to the sliding blocks; each bracket is connected by the balancing spring and the corresponding end of the clamping machine frame; the two electrodes are respectively fixedly and movably connected to the corresponding brackets; the feedback plate and the displacement sensor are respectively connected to one bracket; the pressure touch rod of the pressure sensor is installed on the electrode which is movably connected to the bracket, or the corresponding bracket; the cylinder is fixed on one bracket; the draw rod penetrates through and is sleeved on the other bracket; the end part of the piston rod of the cylinder is coaxially connected with the inner end of the draw rod; and when the piston rod contracts or extends, the cylinder drives the two brackets to make a closing or departing motion. The invention has the advantages of favorable rigidity, convenient and quick adjustment of positions of electrodes and weldments, and high welding quality.

The invention provides an agitating friction spot welding device for dissimilar metal. The device comprises an agitating sleeve, an agitating needle arranged in the agitating sleeve, a clamping sleeve clamped outside the agitating sleeve, and a welding cushion block; a welding workpiece is arranged between the clamping sleeve and the welding cushion pad; an annular electric brush is arranged at the top of the welding cushion block; a T-shaped through hole is formed in the center of the welding cushion block; a conductive rod is arranged in the welding cushion block; the conductive rod is flush with the upper surface of the welding cushion block; and the annular electric brush and the conductive rod are respectively connected with an anode and a cathode of a controllable direct current power supply through a lead. The invention further provides an agitating friction spot welding method for dissimilar metal. The method comprises the following steps of plastically softening metal material, respectively connecting the annular electric brush and the conductive rod with a direct current power supply which has the reversed polarity, so as to conduct a welding loop, and then finishing the welding by adopting a spot welding process. According to the device and the method provided by the invention, as certain welding current is applied to the welding material which is high in lower layer strength during the agitating friction spot welding process of the dissimilar metal, the material is more easily and plastically distorted, the welding pressure is reduced and the welding quality is improved.

The invention provides a full automatic tab welding device, which is used for solving the problems of poor welding quality and low production efficiency of a cathode tab in the prior art. The full automatic tab welding device comprises an engine base, and further comprises an actuating mechanism, wherein guide rails are vertically arranged on the engine base, and a positioning mechanism used for positioning a battery cell is arranged on the guide rails; the actuating mechanism comprises an upper welding electrode movably arranged at the upper parts of the guide rails and a lower welding electrode moveably arranged at the lower parts of the guide rails, and a following mechanism is used for controlling the motion of the upper welding electrode is arranged on the upper welding electrode. The device realizes full automatic mechanization of welding process of the tab during the production technology of cylindrical batteries, saves manpower, greatly improves both production efficiency and welding quality of batteries, is convenient to maintain, is artistic in structure, is accurate in location, is reliable for welding and has multiple functions.

The present invention discloses a convex power-generator shell assembly welding process. Said process includes the following steps: (1), blanking; (2), adopting horizontal upright from-bottom-to-top mode to make assembly; (3), welding, utilizing CO2 gas shielded welding, adopting multi-layer multi-bead welding and symmetrical welding mode to make welding; (4), restriking; (5), utilizing vibration ageing mode to make stress treatment; and (6), sandblasting and forming the invented product.

The invention belongs to the technical field of welding tools, and particularly relates to a seal head welding machining tool of a liquid ammonia tank. A pipe barrel-semiring rail-semiring gear ring assembly is manually assembled and placed on a driven rotating wheel; and a flange seal head and a flange-free seal head are carried by being assisted by manpower, a right locating assembly and a leftlocating assembly achieve automatic clamping, automatic turnover and forward pushing to be in butt joint with the two ends of a pipe barrel, spot welding of a robot is achieved, the right locating assembly and the left locating assembly loosen the seal heads and automatically return to the initial positions, and full welding of the robot is achieved. The seal head welding machining tool and the intelligent robot are used in cooperation and linkage, semi-automation can be achieved, weld joint specifications are uniform and unified, the welding quality can be greatly improved, repair welding work can be reduced, the work efficiency can be improved, and the problem of labor shortage of electric welders can be solved.

The invention discloses an automatic device for preventing necking during welding, pertaining to the field of petroleum pipeline construction. The automatic device for preventing necking during welding is installed on a pipeline and comprises a heating mechanism, a welding protection layer and a support mechanism. The heating mechanism is used for providing heat energy to the pipeline and preheating and warming a welding position of the pipeline. The welding protection layer is arranged on the welding position of the pipeline and used for warming the welding part of the pipeline. The support mechanism is arranged on the pipeline and used for supporting and warming a weld pass of the pipeline. By means of the above structure, functions of heating, warming and diameter expansion are integrated so that problems of weld deformation of pipes and equipment are solved. Deformation at the welding position due to temperature difference during welding is avoided. Welding quality at the welding position is improved and welding efficiency is increased. The necking part can restore to its original state.

The invention discloses an automatic welding device of a curved plate, comprising a roller base, a rotary assembly jig, a drive unit, a welding trolley and a control system, wherein, the roller base is composed of a base, four axle bases, a support roller and a sprocket wheel, the axle bases are arranged on four corners of the base, and the support roller and the sprocket wheel are axially arranged on a support shaft; the rotary assembly jig is composed of a welding platform and circular arc tracks, wherein, the two circular arc tracks are arranged on the bottom of the welding platform in parallel, and a roller chain is arranged along the circular arc tracks; the drive unit is composed of a servo motor, a reduction box and a transmission shaft, wherein, the reduction box drives the sprocket wheel by the transmission shaft; the welding trolley is arranged on the curved plate; the control system is composed of a monitoring tracker and a programmable controller; and the welding platform is tangent to the outer diameter of the support roller of the base by the two circular arc tracks, and the sprocket wheel is meshed with the roller chain. The automatic welding device can ensure that a bent segmented welding line still keeps in a horizontal status in the welding process to automatically weld the curved panel, obviously improve the welding quality of a boat deck and effectively improve the production efficiency of shipbuilding industry.

The invention provides an improved steel tube and hubbed flange butt joint submerged arc welding method. The improved steel tube and hubbed flange butt joint submerged arc welding method comprises the steps of groove machining, joint grinding, splicing, positioned welding, welding of an outer circular seam, welding of an inner circular seam, crack detection and the like. The improved steel tube and hubbed flange butt joint submerged arc welding method can effectively solve the problems in the prior art, especially the problems that the process is complex, the procedures are tedious, operation difficulty is large, the welding speed is low, welding parts are prone to being affected with damp and oxidation in the placement process to generate pores in the welding process after being subjected to spot welding, and accordingly the welding quality is affected.

The invention relates to a device and a method for welding a metal wire and a plate under laser impact loading and belongs to the field of high-speed impact welding. The device comprises a laser generation system, a welding system and a control system, wherein the laser generation system comprises a pulse laser, a reflector, a focusing lens, a focusing lens bracket and a focusing lens position adjusting device; the welding system comprises a restraint layer-adsorbing layer-impact plate-protective coating component, a restraint layer bracket, a restraint layer position adjusting device, a pressing block, the plate, the metal wire, a metal wire clamping device, a workbench, a three-coordinate moving platform and an L-shaped pedestal; and the control system comprises a computer, a pulse laser controller, a three-coordinate moving platform controller, a displacement sensor and a restraint layer position controller. The device and the method for welding the metal wire and the plate under laser impact loading have the advantages that solid welding of the metal wire and the plate can be realized; a heat influence region does not exist after welding; production of intermetallic compounds is avoided; the welding quality is high; and the mechanical property of a welding joint can be improved.

The invention discloses a titanium alloy part vertical fillet weld welding device, which comprises a protective cover enclosed by a plurality of cover plates, wherein the first cover plate is parallelto the second cover plate, the third cover plate is perpendicular to the fourth cover plate, and the fifth cover plate is parallel to the sixth cover plate; The first cover plate is perpendicular tothe fifth cover plate and the third cover plate is perpendicular to the fifth cover plate; The second cover plate is a mesh hole plate, and the first cover plate is provided with a TIG welding gun, the TIG welding gun penetrates the first cover plate and the second cover plate, and points to one side of the second cover plate; Between that first cov plate and the second cover plate, a gas deliverypipe is arrange, a plurality of air outlet holes are arranged on the circumference of the gas delivery pipe, and the inside of the gas delivery pipe is filled with protective gas. The invention aimsto provide a vertical fillet weld welding device for titanium alloy parts, which can effectively prevent the titanium alloy from being oxidized in the welding process and ensure the welding quality, and is particularly suitable for the situation of right fillet weld.

The invention provides a welding fixture for an eight-axis bogie frame of an electric locomotive. The welding fixture comprises a support frame; the support frame comprises two side beams, two cross beams between the side beams, end beams at the two ends of the side beams and connecting bases on the end beams; the two cross beams, the side beams arranged between the cross beams and a connecting beam located between the two cross beams form a middle positioning region; the end beams on the same sides of the side beams, the cross beams and the side beams between the end beams and the cross beams form end positioning regions; the middle positioning region comprises a positioner arranged on the connecting beam, first mounting bases arranged on the side beams and push-on mechanisms arranged on the first mounting bases; each end positioning region comprises three second mounting bases arranged on the corresponding side beam, hold-down mechanisms arranged on the second mounting bases and positioners arranged on the second mounting bases; positioners are arranged on the side beams at the joints of the side beams and the cross beams. The welding fixture for the eight-axis bogie frame of the electric locomotive is capable of quickly and accurately positioning plates by means of the cooperation of the positioners, the push-on mechanisms, the hold-down mechanism, the end positioning mechanisms and the end anti-thrust mechanisms.

The invention belongs to the technical field of welding and provides a novel twin-wire bypass coupled arc efficient metal-inert gas (MIG) welding system. By the adoption of the twin-wire bypass coupled arc efficient MIG welding system, the problems that an existing twin-wire bypass coupled arc efficient MIG welding system is complex in structure and high in cost are solved. The twin-wire bypass coupled arc efficient MIG welding system comprises a welding power source and a dynamic voltage adjusting device. The dynamic voltage adjusting device comprises an invert unit, a filtering unit, a voltage transformation unit and a direct-current output unit. The invert unit is used for inverting direct currents output by the positive electrode of the welding power source into alternating currents. The filtering unit is used for filtering current higher harmonics output by the invert unit in the inverting process. The voltage transformation unit is used for converting the output voltage of the invert unit into the voltage equivalent to the compensation amount of the bypass voltage. The direct-current output unit is used for rectifying the alternating currents output by the voltage transformation unit into the direct currents and outputting the direct currents. Due to the fact that the welding system comprises the welding power source, the system structure is simplified, and the welding cost is reduced.

The invention provides a general laser welding machine for plate workpieces. The laser welding machine comprises a stand column, wherein a cross beam is arranged on the stand column; a support beam is arranged on the cross beam and can move leftwards and rightwards along the cross beam; a laser welding head assembly is arranged on the support beam and can move forwards and backwards along the support beam; the stand column is located on a base plate; two opposite movable baffles are arranged on the base plate and connected with driving mechanisms; the driving mechanisms can drive the two movable baffles to horizontally move in the same or opposite direction; at least one propping head is arranged on the inner side surface of each movable baffle, and each propping head is connected with a propping head cylinder. The laser welding machine is applicable to various to-be-welded plate workpieces, the to-be-welded workpieces can be clamped very conveniently by the aid of a clamping fixation seat, and the clamping force can be kept constant, so that the welding quality can be effectively improved.

The invention discloses a mixed cross bulkhead structure component and a boat comprising the same. The mixed cross bulkhead structure component comprises a cross bulkhead, the cross bulkhead comprises a first cross bulkhead and two second cross bulkheads, the second cross bulkheads are symmetrically arranged on two sides of the first cross bulkhead and connected with sides of an inner shell of the boat, and wall piers are arranged at the joint of the first cross bulkhead and a bottom plate of the inner shell of the boat. By omitting structures of the wall piers of the cross bulkheads connected with the sides of the inner shell of the boat, construction conditions can be improved, welding difficulty is reduced, welding quality is improved, welding amount is decreased, change of the structure of the inner shell of the boat is further avoided, the hold space of the boat is ensured, and strength requirements are met.

The invention relates to a complex structure welding parameter precise management and control system comprising a man-machine interaction unit, a parameter collection unit, an alarm unit, a code scanning unit, a welding operation unit and a welding monitoring unit connected with the man-machine interaction unit, the parameter collection unit, the alarm unit, the code scanning unit and the weldingoperation unit. The man-machine interaction unit is used for inputting preset technological information. The code scanning unit is used for reading a two-dimensional code containing welded workpiece information and welder information. The parameter collection unit is configured to collect welding parameters in real time in the welding process. The welding monitoring unit is used for verifying thewelded workpiece information and the welder information read by the code scanning unit. In the welding process, the welding monitoring unit compares the welding parameters collected by the parameter collection unit with parameters in a corresponding preset technology in real time, and the alarm unit and the welding operation unit are controlled to act according to the comparison result. The invention further relates to a welding method utilizing the complex structure welding parameter precise management and control system, the welding parameters can be monitored precisely, and the automation level is increased.

A novel rotary joint welding method for main shafts of different materials is characterized in that the main shafts of two materials to be welded are respectively subjected to reserved boss and drilling processing, bosses and holes are matched and then subjected to rotary joint welding on a friction welder, and shaft end surfaces which are not screwed in position are fastened in normal welding mode. The rotary joint welding method for the main shafts of different materials has the advantages that the bosses and the holes which are reserved through preprocessing increase the friction area of friction welding and provide good coaxiality for shafts; the shafts to be welded are fastened through normal welding so that strength of the shafts is increased and welding quality is improved.

The invention relates to a welding tool, in particular to an internal supporting and external hooping non-fixing-and-spot-welding girth welder applicable to one-side welding with back formation. The internal supporting and external hooping non-fixing-and-spot-welding girth welder comprises a base platform; an assembly base capable of rotating around a support point is mounted over the base platform. A fixed rotating block is mounted at the right end of the upper surface of the assembly base. The fixed rotating block is connected with an inner supporting device and a first clamping mechanism. A first drive motor is mounted at the upper end of the fixed rotating block. The internal supporting and external hooping non-fixing-and-spot-welding girth welder has the advantages that three or more rotors can be welded with the welder, one-side girth welding with back formation is adopted, no fixing and spot welding process is not preliminarily required during girth welding, welding efficiency is improved, and welding quality is improved.