Wire filling welding device

Abstract

The application provides a filler wire welding device. The filler wire welding device comprises a welding torch, a pipe locking mechanism, a handle and a wire feeding mechanism. The pipe locking mechanism is used for clamping a pipe to be welded, and the pipe locking mechanism clamping the pipe to be welded forms a closed cavity at a weld of the pipe to be welded. The welding torch comprises a tungsten electrode, and the wire feeding mechanism is filled with a welding wire matching a weld filling amount, and the tungsten electrode, the wire feeding mechanism and the welding wire are located in the closed cavity during welding. The tungsten electrode and the wire feeding mechanism can rotate along the circumference of the pipe to be welded to weld the weld of the pipe to be welded in the closed cavity. The above filler wire welding device can realize wire feeding during the welding process on a closed cavity welding device.

Description

Technical Field

[0001] This invention relates to welding equipment for nuclear power engineering pipelines, and more particularly to a filler wire welding device. Background Technology

[0002] Currently, thin-walled tubing for nuclear power plants (generally referring to pipes with a wall thickness of less than 3mm and a diameter of less than 33.4mm) is welded manually using argon arc welding. Using manual electric arc welding with filler wire requires a high level of skill from personnel, leading to low welding efficiency and high labor intensity. For welding medical cleanroom tubing, closed-loop, filler-free self-fusion welding equipment is generally used.

[0003] However, since the closed-type wire-free self-fusion welding equipment does not have a wire-filling function, the base metal needs to self-fuse into the gap during welding, which will create a thickness difference on the surface or back of the weld that is higher or lower than the height of the base metal. This will not meet the acceptance standards of nuclear power plants, thus making this closed-type wire-free self-fusion welding equipment unsuitable for use in the field of pipeline installation in nuclear power engineering. Summary of the Invention

[0004] The purpose of this invention is to provide a wire feeder welding device that can realize wire feeding during the welding process on a closed welding equipment.

[0005] One aspect of the present invention provides a filler welding apparatus, the filler welding apparatus comprising a welding torch, a fitting locking mechanism, a handle, and a wire feeding mechanism; wherein, the fitting locking mechanism is used to clamp the fitting to be welded, and the fitting locking mechanism clamping the fitting to be welded forms a closed cavity at the weld seam of the fitting to be welded; the welding torch includes a tungsten electrode, and the wire feeding mechanism is filled with welding wire matching the filler amount of the weld seam; during the welding process, the tungsten electrode, the wire feeding mechanism, and the welding wire are located within the closed cavity; the tungsten electrode and the wire feeding mechanism are circumferentially rotatable along the fitting to be welded, so as to weld the weld seam of the fitting to be welded within the closed cavity.

[0006] In one embodiment, the wire feeding mechanism includes a wire feeding drive and a wire feeding assembly; the wire feeding assembly is disposed on the wire feeding drive, and the wire feeding drive is capable of driving the wire feeding assembly to rotate circumferentially along the pipe to be welded; the wire feeding assembly includes a welding wire conveyor and a welding wire guide; the inlet end of the welding wire guide is used to load welding wire, and the outlet end of the welding wire guide is disposed relative to the tungsten electrode; the welding wire conveyor is used to convey the welding wire loaded in the welding wire guide to the outlet end of the welding wire guide.

[0007] In one embodiment, the welding wire guide includes an inlet guide tube and an outlet guide tube; the first inlet nozzle of the inlet guide tube is used to load welding wire, and the first outlet nozzle of the inlet guide tube is disposed opposite to the welding wire conveying member; the second inlet nozzle of the outlet guide tube is disposed opposite to the welding wire conveying member, and the second outlet nozzle of the outlet guide tube is disposed opposite to the tungsten electrode; the welding wire conveying member includes a drive wheel, which, during the rotation of the drive wheel, conveys the welding wire from the first outlet nozzle of the inlet guide tube to the second inlet nozzle of the outlet guide tube.

[0008] In one embodiment, the wire feed guide tube is arc-shaped and convex toward the rotating mechanism.

[0009] In one embodiment, the length of the wire feed guide tube is adapted to the space of the enclosed cavity and the length of the welding wire required for the pipe fitting to be welded.

[0010] In one embodiment, the second outlet nozzle of the wire guide tube can be operably moved relative to the tungsten electrode to adjust the distance between the tungsten electrode and the second outlet nozzle of the wire guide tube.

[0011] In one embodiment, the wire feeding mechanism further includes a heat insulation element; the heat insulation element is disposed on the wire feeding drive; during the welding process, the heat insulation element is located between the pipe to be welded and the wire feeding drive to reduce heat radiation to the wire feeding drive.

[0012] In one embodiment, the pipe fitting locking mechanism includes a base, a housing assembly, and a pipe clamp assembly; the housing assembly includes an upper housing and a lower housing, the lower housing being disposed on the base, and the upper housing being openably and closably disposed on the upper housing; the pipe clamp assembly includes an upper pipe clamp and a lower pipe clamp, the upper pipe clamp being disposed on the upper housing, and the lower pipe clamp being disposed on the lower housing; when the upper housing and the lower housing are closed, the upper pipe clamp and the lower pipe clamp enclose a through hole that matches the diameter of the pipe fitting to be welded.

[0013] In one embodiment, there are two outer shell assemblies and two pipe clamp assemblies; when the pipe to be welded is clamped between the upper pipe clamp and the lower pipe clamp, the pipe to be welded, the upper outer shell, the lower outer shell, the upper pipe clamp, and the lower pipe clamp enclose the closed cavity.

[0014] In one embodiment, the wire feeding welding device further includes a power supply mechanism located within the enclosed cavity; the power supply mechanism includes a conductive structure and a contactor; the conductive structure is electrically connected to a power source, and the contactor is electrically connected to the wire feeding mechanism, thereby providing power to the wire feeding mechanism; the contactor and the conductive structure are in sliding contact, and the contactor can rotate with the wire feeding mechanism during its rotation.

[0015] In one embodiment, the conductive structure includes a first conductive portion and a second conductive portion; the first conductive portion is disposed on the inner peripheral wall of the upper housing, and the second conductive portion is disposed on the inner peripheral wall of the lower housing; when the upper housing and the lower housing are closed, the first conductive portion and the second conductive portion are connected to form an annular conductive structure, so that the contactor can slide around the connected first conductive portion and the second conductive portion.

[0016] In one embodiment, the first conductive portion and the second conductive portion each include at least one slide groove; the slide groove of the second conductive portion is electrically connected to the power supply, and at least one end of the slide groove of the second conductive portion is provided with an elastic contact; when the upper housing and the lower housing are closed, the elastic contact contacts the slide groove of the first conductive portion to make the first conductive portion and the second conductive portion conduct.

[0017] In one embodiment, the wire feed welding device further includes a rotating mechanism for driving the tungsten electrode and the wire feeding mechanism to rotate together; the rotating mechanism includes a rotating drive, a transmission gear assembly, and an open gear; the transmission gear assembly and the rotating drive are connected in a transmission connection, the open gear and the transmission gear assembly are connected in a transmission connection, and the tungsten electrode and the wire feeding mechanism are disposed on the open gear; the rotating drive drives the transmission gear assembly to rotate, thereby driving the open gear to rotate, causing the tungsten electrode and the wire feeding mechanism to rotate.

[0018] The filler wire welding device of the present invention provides filler metal to the weld of the pipe to be welded through a wire feeding mechanism in a closed cavity, realizing wire feeding during the welding process. Compared with the closed-type filler wire-free self-fusion welding equipment, it can ensure that the weld on the surface and back of the nuclear power thin-walled tube is not lower than the base material under single-pass welding, so as to meet the nuclear power plant acceptance standards. Attached Figure Description

[0019] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of a structure of an embodiment of the filler wire welding device according to the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the rotating mechanism of the filler wire welding device shown;

[0022] Figure 3 yes Figure 1 A schematic diagram of the wire feeding mechanism of the filler wire welding device shown;

[0023] Figure 4 yes Figure 1 A schematic diagram of the power supply mechanism for the filler wire welding device shown;

[0024] Figure 5 yes Figure 1 The diagram shows the assembly of the filler wire welding device and the pipe fitting to be welded.

[0025] Figure 6 yes Figure 1 A schematic diagram of the handle of the filler wire welding device shown. Detailed Implementation

[0026] Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0027] As used herein, the term "axial" refers to the direction of the pipe to be welded or parallel to the central axis of the pipe to be welded, and the term "circumferential" refers to the direction about the "axial".

[0028] Figure 1 An embodiment of the filler wire welding apparatus of the present invention is shown. The filler wire welding apparatus of the present invention can be applied to the welding of thin-walled tubes for nuclear power plants. Thin-walled tubes for nuclear power plants refer to pipes with a wall thickness of less than 3 mm and a diameter of less than 33.4 mm in the nuclear power field.

[0029] The filler wire welding device of the present invention employs tungsten inert gas (TIG) welding. For example... Figure 1 As shown, the wire-feeding welding device of the present invention includes a welding torch, a pipe fitting locking mechanism 400, and a wire feeding mechanism 200.

[0030] Pipe fitting locking mechanism 400 is used to clamp the pipe fitting to be welded. Figure 1(Not shown), a fitting locking mechanism 400 that holds the fitting to be welded forms a closed cavity 101 at the weld seam of the fitting. The welding torch includes a tungsten electrode 10, and a wire feeding mechanism 200 is loaded with welding wire (not shown) that matches the amount of filler wire in the weld. During welding, the tungsten electrode 10, the wire feeding mechanism 200, and the welding wire are located within the closed cavity 101.

[0031] In this process, a tungsten electrode 10 serves as the electrode, and welding is performed under the protection of an inert gas such as argon. The tungsten electrode 10 generates an electric arc during welding, and the welding wire provides filler metal to the weld seam of the pipe to be welded. Argon gas is ejected from the welding torch, surrounding the arc and the molten pool to prevent oxidation of the molten filler metal by air. Considering the high quality requirements for small-tube welding in the nuclear power industry, the enclosed cavity 101 of the filler wire welding device of this invention has a sealed structure, which improves the gas protection of the weld seam during the welding process, resulting in a beautiful weld seam with a metallic luster.

[0032] The tungsten electrode 10 and the wire feeding mechanism 200 can rotate circumferentially along the pipe to be welded, so as to weld the weld seam of the pipe to be welded within the closed cavity 101. The position of the tungsten electrode 10 relative to the pipe to be welded is fixed, and the wire feeding mechanism 200 needs to adapt to the tungsten electrode 10.

[0033] The filler wire welding device of the present invention provides filler metal to the weld of the pipe to be welded through the wire feeding mechanism 200 in the closed cavity 101, realizing wire feeding during the welding process. Compared with the closed-type filler wire-free self-fusion welding equipment, it can ensure that the weld on the surface and back side of the nuclear power thin-walled tube is not lower than the base material under single-pass welding, so as to meet the nuclear power plant acceptance standards.

[0034] The wire-filling welding device of the present invention employs a short-segment welding wire filling method, that is, cutting welding wire of an appropriate length and loading it into the feeding mechanism. Within the enclosed cavity 101, continuous feeding of coiled welding wire is not possible. The present invention solves the problem that coiled welding wire cannot be used in a sealed enclosed cavity 101, thereby enabling wire feeding during the welding process.

[0035] Combination Figure 1 and Figure 2 In one embodiment, the wire-feeding welding apparatus of the present invention further includes a rotating mechanism 100. The rotating mechanism 100 is used to drive the tungsten electrode 10 and the wire feeding mechanism 200 to rotate together, that is, to provide driving force for the tungsten electrode 10 and the wire feeding mechanism 200 to rotate in the circumferential direction of the pipe to be welded.

[0036] The rotating mechanism 100 includes a rotating base 110, a rotating drive component 120, a transmission gear assembly 130, and an open gear 140. The rotating drive component 120 can be a drive motor. The transmission gear assembly 130 and the rotating drive component 120 are connected in a driving connection, and the open gear 140 and the transmission gear assembly 130 are also connected in a driving connection. The transmission gear assembly 130 includes a bevel gear 131 and a multi-stage gear 132, such as... Figure 2 As shown. The rotating base 110 has an opening, and the open gear 140 is in the shape of an open ring. The tungsten electrode 10 and the wire feeding mechanism 200 are disposed on the open gear 140. The rotating drive 120 drives the transmission gear assembly 130 to rotate, which in turn drives the open gear 140 to rotate, causing the tungsten electrode 10 and the wire feeding mechanism 200 to rotate.

[0037] In this embodiment, the rotation of the rotary drive 120 is achieved by a 90-degree change in the rotational axis via a transmission gear assembly 130. Simultaneously, the motor torque can be amplified by changing the reduction ratio, thereby improving rotational stability.

[0038] In one embodiment, such as Figure 3 As shown, the wire feeding mechanism 200 includes a wire feeding drive and a wire feeding assembly. The wire feeding drive can be a rotary drive 120 or a separate drive structure. The wire feeding assembly is disposed on the wire feeding drive, which can drive the wire feeding assembly to rotate circumferentially along the pipe to be welded. The wire feeding assembly includes a wire conveyor 210 and a wire guide. The wire guide points towards the tungsten electrode 10, facilitating the wire to reach the molten pool. The inlet end of the wire guide is used to load the wire, and the outlet end of the wire guide is positioned relative to the tungsten electrode 10. The wire conveyor 210 conveys the wire loaded in the wire guide to the outlet end of the wire guide.

[0039] Furthermore, the welding wire guide includes an infeed guide tube 220 and an outlet guide tube 230. The first infeed nozzle 221 of the infeed guide tube 220 is used to load welding wire, and the first outlet nozzle 222 of the infeed guide tube 220 is disposed relative to the welding wire conveyor 210. The second infeed nozzle 231 of the outlet guide tube 230 is disposed relative to the welding wire conveyor 210, and the second outlet nozzle 232 of the outlet guide tube 230 is disposed relative to the tungsten electrode 10.

[0040] like Figure 3 As shown, the first wire outlet 222 of the wire inlet guide tube 220 is detachably connected to the wire conveyor 210, and the second wire inlet 231 of the wire outlet guide tube 230 is detachably connected to the wire conveyor 210. Appropriate wire inlet guide tubes 220 and 230 can be selected according to the different diameters of the pipe fittings to be welded.

[0041] The welding wire conveyor 210 can be a single-wheel extrusion drive structure. Specifically, the welding wire conveyor 210 includes a transmission wheel (not shown) and a wire feeding motor (not shown). During the rotation of the transmission wheel, power transmission and motion drive are achieved by the extrusion friction generated between the transmission wheel and the welding wire, thereby conveying the welding wire from the first wire outlet 222 of the wire inlet guide tube 220 to the second wire inlet 231 of the wire outlet guide tube 230.

[0042] Continue to refer to Figure 3 The wire feed guide tube 220 is arc-shaped, i.e., an arc-shaped bend. The wire feed guide tube 220 convexes towards the rotating mechanism 100. In this way, the shape of the wire feed guide tube 220 is adapted to the shape of the open gear 140 of the rotating mechanism 100 and is close to the inner surface of the open gear 140, which can avoid interference with the pipe to be welded and the tungsten electrode 10.

[0043] In one embodiment, the length of the wire feed guide tube 220 is adapted to the space of the enclosed cavity 101 and the required welding wire length of the pipe fitting to be welded. The length of the wire feed guide tube 220 is adapted to the corresponding welding wire length of the pipe fitting to be welded. The length of the wire feed guide bend needs to meet the filler wire length requirements of the corresponding pipe fitting to be welded.

[0044] In actual welding operations, the corresponding welding wire length is determined based on the pipe diameter of the fitting to be welded. Then, the corresponding length of welding wire is cut from the wire spool and inserted through the first feed nozzle 221 of the wire feed guide tube 220. Before welding, the welding wire is loaded into the wire feed guide tube 220.

[0045] The length of the wire feed guide tube 220 can be selected according to the different diameters of the pipe fittings to be welded; alternatively, the wire length corresponding to the largest diameter of the nuclear power thin-walled tube can be selected as the target length of the wire feed guide tube 220, and the actual length of the wire feed guide tube 220 can be greater than or equal to the target length.

[0046] For example, the diameter of the thin-walled tube in nuclear power plants is generally less than φ33.4mm, and the actual length of the wire feed guide tube 220 can be greater than or equal to the welding wire length corresponding to φ33.4mm.

[0047] In this embodiment, the welding process of short welding wire length is combined with the welding process of thin-walled tubes for nuclear power plants, and is also combined with the actual on-site procedures, which improves the on-site welding efficiency.

[0048] The welding wire feeder 210 can be fixed to the inner surface of the open gear 140 of the rotating mechanism 100. During the welding process, the distance between the second wire outlet 232 of different wire outlet guide tubes 230 and the tungsten electrode 10 may be different, which may cause the welding wire to fail to extend into the arc pool formed by the tungsten electrode 10 and the base material.

[0049] In one embodiment, the tungsten electrode 10 is operably movable relative to the second wire outlet 232 of the wire outlet guide tube 230, i.e., the tungsten electrode 10 can be lengthened or shortened to adjust the distance between the tungsten electrode 10 and the second wire outlet 232 of the wire outlet guide tube 230. During welding, the corresponding tungsten electrode 10 elongation and the corresponding wire outlet tube are selected according to the welding process correspondence table, and the welding wire is extended into the arc pool formed by the tungsten electrode 10 and the base material according to the process and wire outlet position.

[0050] The position of the wire guide tube 230 is relatively fixed with the position of the tungsten electrode 10, including the relative fixation in height and angle. This facilitates the adjustment of the extension amount of the tungsten electrode 10, ensuring that the welding wire can reach the molten pool position without interfering with the tungsten electrode 10, and simultaneously forming a qualified and aesthetically pleasing weld.

[0051] like Figure 3 As shown, the wire feeding mechanism 200 also includes a heat insulation element 240. The heat insulation element 240 is disposed within the wire feeding drive. During welding, the heat insulation element 240 is located between the pipe to be welded and the wire feeding drive to reduce heat radiation to the wire feeding drive. The material of the heat insulation element 240 can be ceramic, glass fiber, aluminum silicate fiber, or other materials with good high-temperature resistance and heat insulation properties. The heat insulation element 240 can prevent heat radiation from affecting the motor in the welding wire conveyor 210, reduce the heat radiation rate during welding, and thus ensure the stability of the welding wire feeding mechanism 200.

[0052] In one embodiment, combined with Figure 4 and Figure 5 The pipe fitting locking mechanism 400 includes a base 410, a housing assembly, and a pipe clamp assembly. The housing assembly includes an upper housing 421 and a lower housing 422, with the lower housing 422 disposed on the base 410 and the upper housing 421 openably disposed on the upper housing 421. The pipe clamp assembly includes an upper pipe clamp 431 and a lower pipe clamp 432, with the upper pipe clamp 431 disposed on the upper housing 421 and the lower pipe clamp 432 disposed on the lower housing 422. Both the upper housing 421 and the lower housing 422 have inner grooves to facilitate the positioning and installation of the upper pipe clamp 431 and the lower pipe clamp 432. When the upper housing 421 and the lower housing 422 are closed, the upper pipe clamp 431 and the lower pipe clamp 432 enclose a through hole that matches the diameter of the pipe fitting 1 to be welded.

[0053] Optionally, the upper pipe clamp 431 and upper outer shell 421, and the lower pipe clamp 432 and lower outer shell 422 are detachable, facilitating the selection of suitable upper pipe clamp 431 and lower pipe clamp 432 according to different pipe diameters of the pipe fitting 1 to be welded; or the upper pipe clamp 431 and lower pipe clamp 432 can be processed according to the pipe diameter of the pipe fitting 1 to be welded on site. In this way, the diameter of the through hole formed by different combinations of upper pipe clamp 431 and lower pipe clamp 432 is different, which can improve the adaptability of the pipe fitting locking mechanism 400 to different pipe fittings, improve the stability of clamping the pipe fitting 1 to be welded, and improve the sealing performance of the closed cavity 101.

[0054] There are two outer shell assemblies and two pipe clamp assemblies. The two upper outer shells 421 are connected to each other, and the two lower outer shells 422 are respectively disposed on the base 410. When the pipe fitting 1 to be welded is clamped between the upper pipe clamp 431 and the lower pipe clamp 432, the pipe fitting 1 to be welded, the upper outer shell 421, the lower outer shell 422, the upper pipe clamp 431, and the lower pipe clamp 432 enclose a closed cavity 101. The through holes enclosed by the two upper pipe clamps 431 and the two lower pipe clamps 432 are arranged coaxially to avoid misalignment affecting the clamping effect of the pipe fitting 1 to be welded.

[0055] The pipe fitting locking mechanism 400 also includes a locking clip 441 and a locking fixing clip 442, which are respectively installed on the upper and lower housings 422 to achieve locking when the upper and lower housings are closed.

[0056] The pipe fitting locking mechanism 400 of the present invention can install the device on the pipe fitting to be welded, ensuring that the rotation center of the tungsten electrode 10 coincides with the center of the pipe fitting 1 to be welded during welding.

[0057] In one embodiment, such as Figure 4 As shown, the wire feed welding apparatus also includes a power supply mechanism 300, which is located within the enclosed cavity 101. The power supply mechanism 300 includes a conductive structure 310 and a contactor 320. The conductive structure 310 is made of conductive material and is electrically connected to a power source (not shown, located within the lower housing 422) to deliver power. The contactor 320 is electrically connected to the wire feeding mechanism 200, thereby providing power to the wire feeding mechanism 200. The contactor 320 and the conductive structure 310 are in sliding contact, and the contactor 320 can rotate with the wire feeding mechanism 200 during its rotation, thus achieving uninterrupted power supply to the wire feeding mechanism 200.

[0058] Furthermore, the conductive structure 310 includes a first conductive portion 311 and a second conductive portion 312. The first conductive portion 311 is disposed on the inner peripheral wall of the upper outer shell 421, and the second conductive portion 312 is disposed on the inner peripheral wall of the lower outer shell 422. Figure 4 and Figure 5 As shown, the inner peripheral walls of the upper outer shell 421 and the lower outer shell 422 are arc-shaped. When the upper outer shell 421 and the lower outer shell 422 are closed, the inner peripheral walls of the upper outer shell 421 and the lower outer shell 422 form an annular surface, and the first conductive part 311 and the second conductive part 312 are connected to form an annular conductive structure 310, so that the contactor 320 can slide around the connected first conductive part 311 and the second conductive part 312.

[0059] The first conductive portion 311 and the second conductive portion 312 each include at least one sliding groove 313. The sliding groove 313 is made of annular conductive material, and its mounting contact surface with the upper housing 421 and the lower housing 422 is made of ceramic-coated insulating material. The number of sliding grooves 313 can be installed according to the number of input cables of the welding wire feeder 210. For example... Figure 5 As shown, the upper outer shell 421 is equipped with four sliding grooves 313, and the lower outer shell 422 is equipped with four sliding grooves 313.

[0060] The slide groove 313 of the second conductive part 312 is electrically connected to the power supply, and at least one end of the slide groove 313 of the second conductive part 312 is provided with an elastic contact 314. The elastic contact 314 is a small protrusion on the end face of the slide groove 313, and it is made of conductive material. When the upper housing 421 and the lower housing 422 are closed, the elastic contact 314 contacts the slide groove 313 of the first conductive part 311, so that the first conductive part and the second conductive part 312 are connected. The elastic contact 314 can avoid pipe surface or ellipticity problems, thereby preventing the first conductive part 311 from being de-energized. The elastic contact 314 can be provided at one or both ends of the slide groove 313 of the second conductive part 312, and can also be further provided at one or both ends of the slide groove 313 of the first conductive part 311.

[0061] Based on the above embodiment, the contactor 320 is connected to its elastic elongated contact (not shown) via a motor input line (not shown), and the elastic elongated contact contacts the slide rail 313. To ensure good power conduction, preferably, the length of the elastic elongated contact is greater than 3mm.

[0062] When the wire feeding mechanism 200 rotates, the contactor 320 rotates accordingly to maintain stable current transmission and ensure that the wire feeding mechanism 200 can obtain continuous power supply in different positions. This effectively solves the problem of power interruption that may be caused by the movement of the mechanism, ensures the continuity and stability of the wire feeding process, and improves welding quality and efficiency.

[0063] In one embodiment, such as Figure 6 As shown, the wire-filled welding device of the present invention also includes an operating mechanism 500. The operating mechanism 500 specifically includes a handle 510, a button 520, and a fixing head 530. The handle 510 forms a circuit protection space inside the welding torch. The function keys of the button 520 include, but are not limited to, forward and reverse rotation of the rotating mechanism, arc initiation / exit of welding, wire feeding and retraction of the wire feeding mechanism, device rotation to zero point, and gas detection. The fixing head 530 is used to fix the water inlet pipe 150, electrical wires, gas pipes, and other pipelines to ensure that the pipelines do not loosen in the case of long cables.

[0064] The wire-feeding welding device of this invention uses a closed-loop all-position automatic pipe welding machine as its overall structure, and innovatively designs and uses a miniature wire feeder, as well as an arc-shaped wire inlet and outlet guide tube. Simultaneously, the wire feeding mechanism 200 adopts a sliding wire power supply method to achieve uninterrupted power supply to the wire feeding mechanism 200.

[0065] In conjunction with the above embodiments, taking the common specifications of nuclear power plant thin-walled tubes (diameter φ33.4mm, wall thickness 2.77mm) as an example, the usage steps of the filler wire welding device of the present invention will be further described in detail:

[0066] Before welding, the pipe fittings to be welded need to be spot welded together. The assembly adopts an I-type bevel with an assembly gap of 0-0.5mm. After the assembly is completed and checked to be correct, proceed to the next step.

[0067] Based on the selected device that meets the φ33.4mm specification, select the upper pipe clamp 431 and lower pipe clamp 432 marked with φ33.4mm, and install them in the corresponding positions of the upper outer shell 421 and lower outer shell 422 respectively.

[0068] Turn on the filler wire welding device and use button 520 to "rotate forward" or "rotate backward" to adjust the opening of the opening gear 140 to be parallel to the opening of the rotating base 110 of the rotating mechanism 100.

[0069] Select the wire feed guide tube 220 and wire exit guide tube 230, both marked with φ33.4mm, and install them on the wire feeding mechanism 200. Adjust the extension length of the tungsten electrode 10 to ensure an effective distance of 10-12mm between the tungsten electrode 10 and the second wire exit nozzle 232 of the wire exit guide tube 230. Cut the welding wire to the corresponding length from the wire spool according to the φ33.4mm diameter, and insert it into the wire feed guide tube 220. Use the "wire feed" button 520 on the handle 510 to adjust the welding wire to extend approximately 2-3mm beyond the second wire exit nozzle 232 of the wire exit guide tube 230.

[0070] It should be noted that when welding thin-walled tubes of different diameters, the welding wire cut for different diameters will also be different. The lengths of the wire inlet guide tube 220 and the wire outlet guide tube 230 can cover the length of the cut welding wire, and deviations in the length of the cut welding wire are allowed. If there is any remaining welding wire after welding is completed, it can be manually removed.

[0071] Place the assembled pipe fittings into the corresponding pipe clamp positions, adjust the weld seam position surface of the pipe fittings to coincide with the rotating surface of the tungsten electrode 10 of the welding torch, and after checking that there are no errors, rotate the upper outer shell 421 until it coincides with the end face of the lower outer shell 422, and use the locking clip 441 to lock the upper outer shell 421 and the lower outer shell 422.

[0072] Set the corresponding welding process parameters on the welding control interface. After setting, check the parameters. Once the check is correct, use the "Welding Start / Stop" button 520 on the handle 510 to start welding. No operator intervention is required during the welding process. After welding is complete, the rotating mechanism 100 automatically resets.

[0073] After the protective gas switch of the equipment is turned off and the pipeline temperature drops, open the upper pipe clamp 431 and the lower pipe clamp 432, and take out the welded pipeline to complete the welding.

[0074] The filler wire welding device of the present invention can realize automatic welding of the inner and outer walls of the welded joint of the thin-walled tube of nuclear power plant being higher than the tube wall. Different upper tube clamps 431 and lower tube clamps 432 can be adapted to different tube diameters. Through the miniature wire feeding mechanism 200, the arc-shaped wire inlet guide tube 220 and the wire outlet guide tube 230, the internal space of the closed cavity 101 can be expanded to realize wire feeding and filler welding in the narrow cavity of the closed automatic welding equipment.

[0075] The wire-feeding welding device of the present invention changes the continuous wire feeding method of general welding equipment. By adjusting the length and curvature of the wire feeding mechanism 200 and using a grooving power supply to power the wire feeding mechanism 200, a closed-type all-position automatic pipe welding equipment with wire-feeding welding method is realized, which meets the standard requirement that the weld metal is higher than the surface of the base material.

[0076] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A filler wire welding apparatus characterized by, The filler wire welding device comprises a welding torch, a pipe locking mechanism, a handle and a wire feeding mechanism. The pipe locking mechanism is used for clamping a pipe to be welded, and the pipe locking mechanism clamping the pipe to be welded forms a closed cavity at a weld seam of the pipe to be welded. The welding torch comprises a tungsten electrode, and the wire feeding mechanism is filled with a welding wire matching a weld filling amount, and the tungsten electrode, the wire feeding mechanism and the welding wire are located in the closed cavity during welding. The tungsten electrode and the wire feeding mechanism can rotate along a circumference of the pipe to be welded to weld the weld seam of the pipe to be welded in the closed cavity. The wire feeding mechanism comprises a wire feeding assembly, and the wire feeding assembly comprises a wire conveying member and a wire guide member. The wire guide member comprises an inlet guide pipe and an outlet guide pipe.

2. The filler wire welding apparatus of claim 1, wherein A first inlet nozzle of the inlet guide pipe is used for filling the welding wire, and a first outlet nozzle of the inlet guide pipe is arranged opposite to the wire conveying member. A second inlet nozzle of the outlet guide pipe is arranged opposite to the wire conveying member, and a second outlet nozzle of the outlet guide pipe is arranged opposite to the tungsten electrode. A length of the inlet guide pipe is matched with a space of the closed cavity and a required length of the welding wire of the pipe to be welded. The filler wire welding device further comprises a power supply mechanism located in the closed cavity.

3. The filler wire welding apparatus of claim 2, wherein The power supply mechanism comprises a conductive structure and a contactor, and the contactor is electrically connected with the wire feeding mechanism.

4. The wire filling welding apparatus as defined in claim 3, wherein The conductive structure comprises a first conductive part and a second conductive part.

5. The wire filling welding apparatus as defined in claim 3, wherein The first conductive part and the second conductive part respectively comprise at least one sliding slot.

6. The wire filling apparatus of claim 2, wherein The sliding slot of the second conductive part is electrically connected with a power source, and at least one end of the sliding slot of the second conductive part is provided with an elastic contact. The elastic contact is in contact with the sliding slot of the first conductive part to make the first conductive part and the second conductive part conductive. The first conductive part and the second conductive part are in communication to form a ring-shaped conductive structure, so that the contactor can slide around the communicated first conductive part and second conductive part. The wire feeding mechanism further comprises a wire feeding drive member. The wire feeding assembly is arranged on the wire feeding drive member, and the wire feeding drive member can drive the wire feeding assembly to rotate along the circumference of the pipe to be welded. An inlet end of the wire guide member is used for filling the welding wire, and an outlet end of the wire guide member is arranged opposite to the tungsten electrode. The wire conveying member is used for conveying the welding wire filled in the wire guide member to the outlet end of the wire guide member. The wire conveying member comprises a transmission wheel, and the welding wire is conveyed from the first outlet nozzle of the inlet guide pipe to the second inlet nozzle of the outlet guide pipe during rotation of the transmission wheel. The inlet guide pipe is in an arc shape. The second outlet nozzle of the outlet guide pipe can be operatively moved relative to the tungsten electrode to adjust a distance between the tungsten electrode and the second outlet nozzle of the outlet guide pipe. The wire feeding mechanism further comprises a heat insulation member. The heat insulation member is arranged on the wire feeding drive member. The heat insulation member is located between the pipe to be welded and the wire feeding driving member to reduce heat radiation to the wire feeding driving member.

7. The wire filling welding apparatus according to any one of claims 1 to 6, wherein The pipe locking mechanism comprises a base, a shell assembly and a pipe clamp assembly; The shell assembly comprises an upper shell and a lower shell, the lower shell is arranged on the base, and the upper shell is arranged on the upper shell in a closable manner; The pipe clamp assembly comprises an upper pipe clamp and a lower pipe clamp, the upper pipe clamp is arranged on the upper shell, and the lower pipe clamp is arranged on the lower shell; When the upper shell and the lower shell are closed, the upper pipe clamp and the lower pipe clamp enclose a through hole matched with the pipe diameter of the pipe to be welded.

8. The wire feeding welding apparatus according to claim 7, wherein The shell assembly and the pipe clamp assembly are both two; When the pipe to be welded is clamped between the upper pipe clamp and the lower pipe clamp, the pipe to be welded, the upper shell, the lower shell, the upper pipe clamp and the lower pipe clamp enclose the closed cavity.

9. The wire filling welding apparatus as defined in claim 7, wherein The conductive structure is electrically connected with the power supply, thereby providing power for the wire feeding mechanism; The contactor and the conductive structure are in sliding contact, and the contactor can rotate with the wire feeding mechanism during rotation of the wire feeding mechanism.

10. The wire feeding welding apparatus according to claim 9, wherein The first conductive part is arranged on the inner circumferential wall of the upper shell, and the second conductive part is arranged on the inner circumferential wall of the lower shell; When the upper shell and the lower shell are closed, the first conductive part and the second conductive part are in communication to form a ring-shaped conductive structure, so that the contactor can slide around the communicated first conductive part and the second conductive part.

11. The wire filling welding apparatus as defined in claim 10, wherein When the upper shell and the lower shell are closed, the elastic contact and the sliding wire groove of the first conductive part are in contact, so that the first conductive part and the second conductive part are in conduction.

12. The wire feeding welding apparatus according to any one of claims 1 to 6, wherein The filler wire welding device further comprises a rotating mechanism for driving the tungsten electrode and the wire feeding mechanism to rotate together; The rotating mechanism comprises a rotating driving member, a transmission gear assembly and an open gear; The transmission gear assembly and the rotating driving member are in transmission connection, the open gear and the transmission gear assembly are in transmission connection, and the tungsten electrode and the wire feeding mechanism are arranged on the open gear; The rotating driving member drives the transmission gear assembly to rotate, thereby driving the open gear to rotate, so that the tungsten electrode and the wire feeding mechanism rotate.

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