Apparatus for sealing tubular articles by means of contact butt welding

FIELD: power engineering, namely nuclear power reactors, particularly sealing of fuel elements by means of contact butt welding with use of plugs.

SUBSTANCE: apparatus includes sealed welding chamber with housing non-detachable at operation and having through duct for feeding parts to welding zone; mechanisms for sealing welding chamber; device for feeding parts to welding zone; additional clamp of tube; mechanisms for gripping and fixing welded parts; drive device for supplying welding pressure; autonomous drive units. Mechanisms for gripping and fixing welded parts are in the form of collet chucks with respective drives. Welding pressure supply drive device is connected with electrode holder of plug. Welding chamber is restricted by non-detachable housing and flange-current supply lead that is fluid -tightly connected with housing and fixed relative to housing at operation. One collet chuck has annular detachable current supply lead in the form of sectors and it rests by its end at side of large base of petal cone upon said flange-current supply lead. Collet chuck of tube grip and electrode-holder of plug have coaxial electrically insulated one relative to other tie rods arranged in through duct of chamber and joined with autonomous drive units.

EFFECT: enhanced stability of process, improved quality of welded joint due to lowered misalignment of tube and plug.

1 dwg

 

The invention relates to atomic energy and can be used for sealing contact butt welding using a stub rod fuel elements (Fe).

Currently, the sealing of the fuel Rods is carried out at facilities of contact butt welding, built-in automatic lines with a high degree of automation of production and control operations. During the operation of sealing by welding to the open end of the sheath of a fuel rod, pre-filled with nuclear fuel, pressed the butt plugs and the heat passing welding current and joint plastic deformation of the pipes and plugs under the action of the applied load is formed of a welded connection. Before sealing the internal volume of the shell of a fuel rod vacuumized and filled with inert gas under high pressure. The main criterion for determining the reliability of fuel elements, is the sealing of their shells, largely dependent on the quality of a welded joint, which is affected by the uniformity of distribution of welding current on the contact area of the welded components, which is achieved by reducing the misalignment of the pipes and plugs.

Known device for sealing fuel elements having a flexible all-in-one camera working with the second cavity, provided end-to-end coaxial channels, which are located opposite each other, each of the workpiece, the clamping device and the electrodes (see application France 2.331.126, class B 23 k 11/02, BOPI No. 27, 1977). The disadvantage of this setup is the mobility of the camera relative to the workpiece and a counter location inside the chamber of a large number of also moving parts, providing a coaxial engagement and current supply to the welding details. To ensure alignment of welded components in the manufacture of the camera body requires a precise coordination of the holes forming the through channels. Gaps, providing the camera movement, the gripping devices and leads also affect the alignment of the plug and shell.

Also known installation comprising a movable, detachable camera perpendicular to its axis connector separating the working cavity into two parts, each of which is installed on the frame with the possibility of reciprocation and provided with a collet clamping mechanism for gripping the workpiece and tubular rods arranged in end-to-end channels and connecting the hooks with the appropriate actuators, mounted on the ends of the welding chamber on both sides of the connector, the actuator welding pressure rigidly connected with one of p is ibodov tubular rods with the possibility of joint movement (see as the USSR №941070, Ál. 3 In 23 To 11/04 from 07.07.82,, bull. No. 25).

The disadvantage of this setup, in terms of ensuring alignment of the welded parts is the mobility of the welding chamber, a counter location (on both sides of the connector collet clamping mechanisms capture the details, the location of the tubular rods in end-to-end channels of the camera, for the manufacture of which requires a precise coordination of the holes in both parts of the working cavity relative to the guides, a large number of devices allowing the opening and sealing of the working cavity of the camera and reducing the productivity of the installation.

There are also a number of known installations (see A.S. USSR №1279152, Ál. 5 At 23 To 11/04 from 23.06.91,, bull. No. 23; the patent of Russian Federation №2152091, Ál. 7 G 21 C 21/02, 23 To 11/04 from 27.06.2000)containing detachable camera with clamping devices in each part of the camera. The alignment of the welded parts is ensured by built-regulating device, the throttling alignment when setting up manual or automatic.

The disadvantages of these settings are also movable plug welding chamber, opposite the location of the collet clamps, extra elements for adjusting alignment and performance in the stop automatic line for manual adjustment

Closest to the technical essence and the achieved effect to the proposed solution prototype is a machine for flash butt welding tubular sheath of the Fuel element with a plug (see Russian Federation patent No. 1490829, Ál. 5 At 23 To 11/00, bull. No. 15 from 23.04.91 g), which contains a detachable sealed chamber made in the form placed in coaxial guides hollow drive sliders, one of which is the main clamp for tubular shell with his drive and electrical power supply and the other electrode-holder for the stub associated with the drive of the welding force, feeding the main clamping flange with a Central hole, which is tightly attached to the slide bearing tubular sheath of a fuel rod from the side of the camera connector and the annular detachable current leads in the form of sectors, primary and secondary clamps tubular shell having a self-contained actuators Tsang and guide slide bearing tubular shell and the cover, which is made in the form of buildings, installed through the insulation on the rods, the ends of which are fixed to the actuator body creating a welding force and the body of the slide carrying the tubular shell.

The disadvantage of this setup is the mobility of the elements of the welding chamber, forming the working volume, counter location (on both sides of the connector) is angovia clamps gripping mechanisms details the arrangement of drive hollow slide in guides to ensure alignment which requires precise coordination of holes mating with the rod and hollow sliders, a large number of devices allowing the opening, sealing the working cavity of the chamber, locking moving parts of the camera and reducing the productivity of the installation.

The objective of the invention is to increase the stability of the welding process and the quality of a welded joint by reducing misalignment of the plug and tube.

The solution is achieved by a device for sealing contact butt welding, containing all in the process of building a sealed welding chamber with a through channel for delivery of parts in the welding zone, the sealing mechanisms of the welding chamber, the feeder welded parts in the welding zone, additional clamp pipe, the gripping mechanisms and fixing the workpiece in the form of collets with the appropriate actuators, actuator welding pressure associated with the electrode-holder stub, and the welding chamber is formed one-piece housing and hermetically attached to the stationary during operation relative to the housing flange-electrical power supply, and one of the Tsang has a ring demountable current lead in the form of sectors and is supported by an end face of the larger the warping of the cone petals in the flange-current lead according to the claims, equipped with independent drives and collet clamp pipe and the electrode-holder plugs are coaxial, electrically isolated from each thrust, located in the through channel of the camera and connected with the said auxiliary drives.

This set of features is new and involves an inventive step as coaxial arrangement of the rods allows to reduce the concentricity relative to each other planting cones under collets, to simplify the manufacturing process and to improve the accuracy of the centering stub and the pipe.

The proposed solution is illustrated in the drawing.

The drawing shows a diagram of the device for sealing contact butt welding of tubular products.

The device has a frame (1) with a stiffness sufficient to ensure the absence of its deflection under the application of welding force to the welded parts. On the frame is rigidly fixed one-piece housing (2), additional clamp pipe (3)and drive the sealing of the welding chamber by the pipe (4), the drive collet clamp pipe (5), the actuator (6) create a gap between the welded parts, the drive of the welding pressure (7). To the housing (2) acorn nut (8) is sealed flange-current lead (9), which forms the internal working volume of the welding chamber. In the flange of the electrical power supply available Central is twistie, which serves in the welding chamber the parts to be welded bracket (10) and the pipe (11). On the outer end of the flange-electrical power supply is the sealing mechanism of the welding chamber (12), movable parts which are rigidly connected with its actuator (4). The inner end of the flange-busbar support the ends of the ring sectors detachable electrical power supply (13)fixed on the inner surface of the spring petals collet clamp pipe (14). Petals collets their conical surfaces rely on boarding hollow cone thrust (15), which is rigidly connected to the actuator (5) collets clamping of the pipe. Between the housing (2) and thrust (15) has an annular sliding adjustable seal (16), ensuring the sealing of the working volume of the welding chamber and the free movement of thrust when the actuator (5). In the coaxial hole of the hollow thrust (15) is placed a hollow rod (17)rigidly associated with the actuator (6). The rod (17) consists of two outer and inner shells, separated by a layer of insulating material. Shell does not have a reciprocal movement in the axial and in the radial direction. Seal thrust (15) and piston rod (17) is annular sliding adjustable seal (18). In the coaxial hole of the hollow shaft (17) posted by rod (19) of the electrode-holder insert is rigidly connected through the electrically insulating strips is at (20) with actuator (21). The actuator housing (21) is rigidly connected with a hollow shaft (17). Rod (19) is connected with the electrode-holder plug (22)made in the form of a three collets. The petals of its workers conical surfaces rely on boarding cone inner shell of the hollow shaft (17). The inner diameter of the electrode-holder (22) is placed in the shank of the plug (10), the end of which abuts against the end of the pipe (11). Seal thrust (19) and piston rod (17) is annular sliding adjustable seal (23). The rod (17) and the flange-current lead (9) is connected to the welding power source (24) and through the sector ring detachable electrical power supply (13), pipe (11), the cover (10) and the electrode-holder plug (22) form a welding secondary circuit.

The device operates as follows.

Feeder welded components (not shown) grommet (10) and the pipe (11) is served in the welding chamber. Plug your shank enters the hole of the electrode-holder (22), and the flange abuts against the end face of the electrode holder and remains in this position, feeling the axial pressure pipe, which is created by feeder welded parts. This is the initial state shown in the drawing.

Enables the actuator (21), which moves in the axial direction relative to the hollow rod (17), rod (19)associated with the electrode-holder plug (22)Lebestky electrode-holder closed, clamping the shank of the plug (10). After holding the stub includes the drive collet clamp pipe (5)rigidly connected with the hollow thrust (15). Rod (15), moving in the axial direction relative to the hollow rod (17), affects the conical surface on the conical surface of the petals of the collet (14). Moving in the radial direction, the petals of the collet (14) through the sector ring detachable electrical power supply (13) pipe clamp (11). In the axial direction petals collets are not able to move, so as rigidly connected with the ring sectors detachable electrical power supply (13). After holding the pipe collet included additional clamp (3), which prevents axial displacement of the pipe from exposure to welding pressure, which can't hold the heated pipe due to its structural characteristics of the sector ring detachable electrical power supply (13). After actuation of the additional clamp is activated actuator seal welding chamber by the pipe (4)rigidly connected with the sealing mechanism of the welding chamber (12). Is sealing the Central hole flange electrical power supply (9), in which the pipe (11). Simultaneously with the actuator (4) is activated, the actuator (6) create a gap between the welded parts, which is rigidly connected with a hollow shaft (17). The hollow rod is moved in the axial direction together with the ele is trod-holder plug (22), in which is clamped the blank (10), and removes it from the end of the pipe, creating a gap of a certain size is necessary for the evacuation and filling with an inert gas to the inner volume of the pipe. The gap between the pipe and the stub is determined by the stroke of the actuator (6)which is limited by the retainer rigidly connected to the drive welding force (7). After setting the movable part of the actuator (6) the latch is the vacuum welding chamber and the internal volume of the pipe; after reaching a specified residual pressure is the inlet inert gas. Device vacuum and gas inlet not shown. After filling the internal volume of the tube with an inert gas includes the actuator welding force (7) and reverse drive create a gap (6). The hollow rod (17) is moved to another side of the plug (10) in the end of the pipe (11), a welding pressure between the welded parts. After the time delay needed for the stabilization of the welding pressure, turns on the welding power source (24). By passing welding current through allowances for welding and upsetting the workpiece is heated. Under the influence of the welding pressure, the plug is pushed into the tube, there is a mutual plastic deformation of allowances for welding and upsetting, welding current is switched off, is formed of a welded joint is. Actuates the actuator (21) the petals of the electrode-holder plug (22) is disclosed, freeing from capturing the shank stub. The drive of the welding force (7) returns to its original state. From the welding chamber is discharged inert gas. The drive collet tube (5) is returned to its original state collet (14), free from the capture tube (11). The actuator (4) and clamp tubes (3) are returned in original condition. Sealed fuel rod is unloaded from the welding chamber, the device is ready for the next welding cycle.

Device for sealing contact butt welding of tubular products containing all-in-one in the process of building a sealed welding chamber with a through channel for delivery of parts in the welding zone, the sealing mechanisms of the welding chamber, the feeder welded parts in the welding zone, additional clamp pipe, the gripping mechanisms and fixing the workpiece in the form of collets with the appropriate actuators, actuator welding pressure associated with the electrode-holder stub, and the welding chamber is formed one-piece housing and hermetically attached to the stationary during operation relative to the housing flange-electrical power supply, and one of the collets has a ring demountable current lead in the form of sectors and is supported by an end face of the larger base of consolidatkon in the flange-feeding, characterized in that it is equipped with independent drives and collet clamp pipe and the electrode-holder plugs are coaxial, electrically isolated from each thrust, located in the through channel of the camera and connected with the said auxiliary drives.



 

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