Filling wire welding device

Abstract

The invention provides a filler wire welding device. The wire filling welding device comprises a welding torch, a pipe fitting locking mechanism, a handle and a wire feeding mechanism. Wherein the pipe fitting locking mechanism is used for clamping a to-be-welded pipe fitting, and the pipe fitting locking mechanism clamping the to-be-welded pipe fitting forms a closed cavity at a weld joint of the to-be-welded pipe fitting. The welding torch comprises a tungsten electrode, the wire feeding mechanism is filled with a welding wire matched with the welding seam filling amount, and the tungsten electrode, the wire feeding mechanism and the welding wire are located in the closed cavity in the welding process. The tungsten electrode and the wire feeding mechanism can rotate in the circumferential direction of the pipe fitting to be welded so as to weld a weld joint of the pipe fitting to be welded in the closed cavity. According to the wire filling welding device, wire feeding in the welding process can be achieved on closed cavity welding equipment.

Description

Technical Field

[0001] The invention relates to nuclear power engineering pipeline welding equipment, in particular to a filler wire welding device. Background Art

[0002] At present, nuclear power thin-walled small pipes (generally referring to pipes with a wall thickness of less than 3mm and a diameter of less than 33.4mm) are welded by manual argon arc welding. If manual arc welding with wire filling is used, it requires high skill levels of personnel, which will lead to problems such as low manual welding efficiency and high labor intensity. For the welding of medical clean pipes, closed self-melting welding equipment without wire filling can generally be used.

[0003] However, since the closed type self-melting welding equipment without filler wire does not have the function of filling wire, the parent metal needs to self-melt and fill the gap during welding, which will form a thickness difference higher or lower than the height of the parent metal on the surface or back of the weld, and cannot meet the acceptance standards of nuclear power plants. As a result, this closed type self-melting welding equipment without filler wire cannot be used in the field of nuclear power engineering pipeline installation. Summary of the invention

[0004] The object of the present invention is to provide a wire-filling welding device, which can realize wire feeding during welding on a closed welding device.

[0005] One aspect of the present invention provides a filler wire welding device, which includes a welding torch, a pipe locking mechanism, a handle and a wire feeding mechanism; wherein the pipe locking mechanism is used to clamp the pipe to be welded, and the pipe locking mechanism that clamps the pipe to be welded forms a closed cavity at the weld of the pipe to be welded; the welding torch includes a tungsten electrode, and the wire feeding mechanism is filled with welding wire that matches the welding seam filling amount, and during the welding process, the tungsten electrode, the wire feeding mechanism and the welding wire are located in the closed cavity; 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.

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

[0007] In one embodiment, the welding wire guide member includes a wire inlet guide tube and a wire outlet guide tube; the first wire inlet nozzle of the wire inlet guide tube is used to load welding wire, and the first wire outlet nozzle of the wire inlet guide tube is arranged relative to the welding wire conveying member; the second wire inlet nozzle of the wire outlet guide tube is arranged relative to the welding wire conveying member, and the second wire outlet nozzle of the wire outlet guide tube is arranged relative to the tungsten electrode; the welding wire conveying member includes a transmission wheel, and the welding wire is transmitted from the first wire outlet nozzle of the wire inlet guide tube to the second wire inlet nozzle of the wire outlet guide tube during the rotation of the transmission wheel.

[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 closed cavity and the length of the welding wire required by the pipe to be welded.

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

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

[0012] In one embodiment, the pipe locking mechanism includes a base, a shell assembly and a pipe clamp assembly; the shell assembly includes an upper shell and a lower shell, the lower shell is arranged on the base, and the upper shell can be opened and closed on the upper shell; the pipe clamp assembly includes 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 that is compatible with the pipe diameter of the pipe to be welded.

[0013] In one embodiment, there are two shell components and two pipe clamp components; 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.

[0014] In one embodiment, the wire-filling welding device also includes a power supply mechanism, which is located in the closed 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 is in sliding contact with the conductive structure, and the contactor can rotate with the wire feeding mechanism during the rotation of the wire feeding mechanism.

[0015] In one embodiment, the conductive structure includes a first conductive part and a second conductive part; 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 connected to form a ring-shaped conductive structure, so that the contactor can slide around the connected first conductive part and the second conductive part.

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

[0017] In one embodiment, the wire-filling welding device also includes a rotating mechanism for driving the tungsten electrode and the wire feeding mechanism to rotate together; the rotating mechanism includes a rotating driving member, a transmission gear assembly and an open gear; the transmission gear assembly and the rotating driving member are transmission-connected, the open gear and the transmission gear assembly are transmission-connected, 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.

[0018] The filler wire welding device of the present invention provides filler metal for the weld of the pipe to be welded through a wire feeding mechanism in a closed cavity, thereby realizing wire feeding during the welding process. Compared with closed self-melting welding equipment without filler wire, it can ensure that the welds on the surface and back of nuclear power thin-walled small pipes are not lower than the parent material in a single-pass welding, so as to meet the acceptance standards of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 is a structural schematic diagram of an embodiment of a wire-filling welding device according to the present invention;

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

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

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

[0024] Figure 5 yes Figure 1 A schematic diagram of the matching of the filler wire welding device and the pipe to be welded is shown;

[0025] Figure 6 yes Figure 1 A schematic diagram of a handle of a filler wire welding device is shown. DETAILED DESCRIPTION

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

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

[0028] Figure 1 An embodiment of the wire-filling welding device of the present invention is shown. The wire-filling welding device of the present invention can be applied to the welding of thin-walled small tubes of nuclear power. The thin-walled small tubes of nuclear power 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 wire-filling welding device of the present invention adopts tungsten inert gas arc welding. Figure 1 As shown, the wire-filling welding device of the present invention includes a welding torch, a pipe locking mechanism 400 and a wire feeding mechanism 200 .

[0030] The pipe locking mechanism 400 is used to clamp the pipe to be welded ( Figure 1The welding torch comprises a tungsten electrode 10, and a wire feeding mechanism 200 is loaded with welding wire (not shown) matching the welding seam filling amount. During the welding process, the tungsten electrode 10, the wire feeding mechanism 200 and the welding wire are located in the closed cavity 101.

[0031] The tungsten electrode 10 is used as an electrode, and welding is performed under the protection of an inert gas such as argon. The tungsten electrode 10 generates an arc during the welding process, and the welding wire provides filler metal for the weld of the pipe to be welded, and argon gas is ejected from the welding torch to surround the arc and the molten pool to prevent air from oxidizing the molten filler metal. Considering the requirements of the nuclear power industry for the quality of small pipe welding, the closed cavity 101 of the wire-filling welding device of the present invention is a sealed structure, which improves the gas protection of the weld during the welding process, so that the weld is beautifully formed and the surface presents a metallic luster.

[0032] The tungsten electrode 10 and the wire feeding mechanism 200 can rotate along the circumference of the pipe to be welded to weld the weld seam of the pipe to be welded in 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 wire-filling welding device of the present invention provides filler metal for the weld of the pipe to be welded through the wire feeding mechanism 200 in the closed cavity 101, thereby realizing wire feeding during the welding process. Compared with the closed self-melting welding equipment without filler wire, it can ensure that the welds on the surface and back of the nuclear power thin-walled small pipe are not lower than the base material in a single-pass welding, so as to meet the acceptance standards of the nuclear power plant.

[0034] The wire-filling welding device of the present invention adopts a wire-filling method of small-length welding wire, that is, cutting a welding wire of appropriate length and filling it into the feeding mechanism. In the closed cavity 101, the coiled welding wire cannot realize continuous wire feeding. The present invention can solve the problem that the coiled welding wire cannot be used in the sealed closed cavity 101, so as to realize wire feeding during the welding process.

[0035] Combination Figure 1 and Figure 2 In one embodiment, the wire-filling welding device of the present invention further comprises 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 driving member 120, a transmission gear assembly 130 and an open gear 140. The rotating driving member 120 may be a driving motor. The transmission gear assembly 130 is in transmission connection with the rotating driving member 120, and the open gear 140 is in transmission connection with the transmission gear assembly 130. The transmission gear assembly 130 includes a bevel gear 131 and a multi-stage gear 132, such as Figure 2 The rotating base 110 has an opening, the open gear 140 is in an open ring shape, and the tungsten electrode 10 and the wire feeding mechanism 200 are arranged on the open gear 140. The rotary drive member 120 drives the transmission gear assembly 130 to rotate, thereby driving the open gear 140 to rotate, so that the tungsten electrode 10 and the wire feeding mechanism 200 rotate.

[0037] In this embodiment, the rotation of the rotary drive member 120 is changed by 90 degrees through the transmission gear assembly 130. At the same time, the motor torque can be amplified by changing the reduction ratio, thereby improving the stability of the rotation.

[0038] In one embodiment, if Figure 3 As shown, the wire feeding mechanism 200 includes a wire feeding drive and a wire feeding assembly. The wire feeding drive may be a rotary drive 120 or a separate driving structure. The wire feeding assembly is arranged on the wire feeding drive, and the wire feeding drive can drive the wire feeding assembly to rotate along the circumference of the pipe to be welded. The wire feeding assembly includes a welding wire conveyor 210 and a welding wire guide. The welding wire guide may point to the tungsten electrode 10, so that the welding wire can reach the molten pool position. The inlet end of the welding wire guide is used to load the welding wire, and the outlet end of the welding wire guide is arranged relative to the tungsten electrode 10. The welding wire conveyor 210 is used to convey the welding wire loaded in the welding wire guide to the outlet end of the welding wire guide.

[0039] Furthermore, the wire guide comprises a wire inlet guide tube 220 and a wire outlet guide tube 230. The first wire inlet nozzle 221 of the wire inlet guide tube 220 is used to load the wire, and the first wire outlet nozzle 222 of the wire inlet guide tube 220 is arranged relative to the wire conveying member 210. The second wire inlet nozzle 231 of the wire outlet guide tube 230 is arranged relative to the wire conveying member 210, and the second wire outlet nozzle 232 of the wire outlet guide tube 230 is arranged relative to the tungsten electrode 10.

[0040] like Figure 3 As shown, the first wire outlet nozzle 222 of the wire inlet guide tube 220 and the welding wire conveyor 210 are detachably connected, and the second wire inlet nozzle 231 of the wire outlet guide tube 230 and the welding wire conveyor 210 are detachably connected. Suitable wire inlet guide tube 220 and wire outlet guide tube 230 can be selected according to the different diameters of the pipes to be welded.

[0041] The welding wire conveyor 210 may 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, the extrusion friction force generated between the transmission wheel and the welding wire is used to realize power transmission and motion drive, thereby transmitting the welding wire from the first wire outlet nozzle 222 of the wire inlet guide tube 220 to the second wire inlet nozzle 231 of the wire outlet guide tube 230.

[0042] Continue to refer Figure 3 The wire guide tube 220 is arc-shaped, i.e., an arc-shaped curved tube. The wire guide tube 220 is convex toward the rotating mechanism 100, so that the shape of the wire guide tube 220 matches the shape of the open gear 140 of the rotating mechanism 100 and is close to the inner surface of the open gear 140, thereby avoiding interference with the pipe to be welded and the tungsten electrode 10.

[0043] In one embodiment, the length of the wire guide tube 220 is adapted to the space of the closed cavity 101 and the length of the welding wire required by the pipe to be welded. The length of the wire guide tube 220 is adapted to the corresponding welding wire length of the pipe to be welded. The length of the wire guide elbow needs to meet the filler wire length requirement of the corresponding pipe to be welded.

[0044] In actual welding operations, the corresponding welding wire length is determined according to the diameter of the pipe to be welded. Then, the welding wire of the corresponding length is cut from the welding wire reel and inserted into the first wire inlet nozzle 221 of the wire inlet guide tube 220. Before welding, the welding wire is loaded into the wire inlet guide tube 220.

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

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

[0047] In this embodiment, a short welding wire length is combined with the welding process of nuclear power thin-walled small tubes and is combined with the actual on-site process to improve the on-site welding efficiency.

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

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

[0050] The position of the wire guide tube 230 is relatively fixed to the position of the tungsten electrode 10, including relative fixity in height and angle, which facilitates adjustment of the extension amount of the tungsten electrode 10. The welding wire can reach the molten pool position without interfering with the tungsten electrode 10, while forming a qualified and beautiful weld.

[0051] like Figure 3 As shown, the wire feeding mechanism 200 also includes a heat insulating member 240. The heat insulating member 240 is disposed on the wire feeding drive member. During the welding process, the heat insulating member 240 is located between the pipe to be welded and the wire feeding drive member to reduce the heat radiation to the wire feeding drive member. The material of the heat insulating member 240 can be selected from ceramics, glass fiber, aluminum silicate fiber or other materials with good high temperature resistance and heat insulation performance. The heat insulating member 240 can avoid the influence of heat radiation on the motor in the welding wire conveying member 210, reduce the heat radiation speed during the welding process, and thus ensure the stability of the welding wire feeding mechanism 200.

[0052] In one embodiment, in combination Figure 4 and Figure 5 The pipe fitting locking mechanism 400 includes a base 410, a shell assembly and a pipe clamp assembly. The shell assembly includes an upper shell 421 and a lower shell 422, the lower shell 422 is arranged on the base 410, and the upper shell 421 is arranged on the upper shell 421 in an openable and closable manner. The pipe clamp assembly includes an upper pipe clamp 431 and a lower pipe clamp 432, the upper pipe clamp 431 is arranged on the upper shell 421, and the lower pipe clamp 432 is arranged on the lower shell 422. The upper shell 421 and the lower shell 422 are provided with inner grooves to facilitate the positioning and installation of the upper pipe clamp 431 and the lower pipe clamp 432. When the upper shell 421 and the lower shell 422 are closed, the upper pipe clamp 431 and the lower pipe clamp 432 enclose a through hole that matches the pipe diameter of the pipe fitting 1 to be welded.

[0053] Optionally, the upper pipe clamp 431 and the upper shell 421, the lower pipe clamp 432 and the lower shell 422 are detachable, so that it is convenient to select the upper pipe clamp 431 and the lower pipe clamp 432 that match the pipe fittings 1 to be welded with different pipe diameters; the upper pipe clamp 431 and the lower pipe clamp 432 can also be processed according to the pipe diameter of the pipe fittings 1 to be welded on site. In this way, the diameters of the through holes formed by different combinations of the upper pipe clamp 431 and the lower pipe clamp 432 are different, which can improve the adaptability of the pipe fitting locking mechanism 400 to different pipe fittings, improve the stability of clamping the pipe fittings 1 to be welded, and improve the sealing of the closed cavity 101.

[0054] There are two shell components and two pipe clamp components, two upper shell components 421 are connected to each other, and two lower shell components 422 are respectively arranged on the base 410. When the pipe 1 to be welded is clamped between the upper pipe clamp 431 and the lower pipe clamp 432, the pipe 1 to be welded, the upper shell component 421, the lower shell component 422, the upper pipe clamp 431 and the lower pipe clamp 432 enclose a closed cavity 101. The through holes respectively 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 1 to be welded.

[0055] The pipe locking mechanism 400 further includes a locking clamp 441 and a locking fixing clamp 442, which are respectively mounted on the upper and lower shells 422 to achieve locking when the upper and lower shells are closed.

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

[0057] In one embodiment, if Figure 4 As shown, the wire-filling welding device also includes a power supply mechanism 300, which is located in the closed cavity 101. The power supply mechanism 300 includes a conductive structure 310 and a contactor 320. The conductive structure 310 is a conductive material, and the conductive structure 310 is electrically connected to a power source (not shown, located in the lower housing 422) to transmit electricity. The contactor 320 is electrically connected to the wire feeding mechanism 200 to provide power to the wire feeding mechanism 200. The contactor 320 is in sliding contact with the conductive structure 310, and the contactor 320 can rotate with the wire feeding mechanism 200 during the rotation of the wire feeding mechanism 200 to achieve the function of 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 circumference of the upper housing 421, and the second conductive portion is disposed on the inner circumference of the lower housing 422. Figure 4 and Figure 5 As shown, the inner circumference of the upper shell 421 and the lower shell 422 is an arc surface. When the upper shell 421 and the lower shell 422 are closed, the inner circumference of the upper shell 421 and the lower shell 422 forms a circular ring surface, and the first conductive part 311 and the second conductive part 312 are connected to form a ring-shaped 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 part 311 and the second conductive part 312 each include at least one wire guide groove 313. The wire guide groove 313 is a ring-shaped conductive material, and its mounting contact surface with the upper shell 421 and the lower shell 422 is a ceramic sprayed insulating material. A corresponding number of wire guide grooves 313 can be installed according to the number of input cables of the welding wire conveyor 210. Figure 5 As shown, four wire slide grooves 313 are installed on the upper shell 421, and four wire slide grooves 313 are installed on the lower shell 422.

[0060] The wire groove 313 of the second conductive part 312 is electrically connected to the power supply, and at least one end of the wire groove 313 of the second conductive part 312 is provided with an elastic contact 314. The elastic contact 314 is a small boss protruding from the end surface of the wire groove 313, which is a conductive material. When the upper shell 421 and the lower shell 422 are closed, the elastic contact 314 contacts the wire groove 313 of the first conductive part 311 to make the first guide point part and the second conductive part 312 conductive. The elastic contact 314 can avoid the problem of pipeline surface or ovality, thereby avoiding the first conductive part 311 from being powered off. The elastic contact 314 can be arranged at one end or both ends of the wire groove 313 of the second conductive part 312, and can also be further arranged at one end or both ends of the wire groove 313 of the first conductive part 311.

[0061] On the basis of the above embodiment, the contactor 320 is connected to the elastic long contact (not shown) of the contactor 320 through the motor input line (not shown), and the elastic long contact contacts the sliding wire groove 313. To ensure good power conduction, preferably, the length of the elastic long contact is greater than 3mm.

[0062] When the wire feeding mechanism 200 rotates, the contactor 320 rotates accordingly to maintain stable current transmission, ensuring that the wire feeding mechanism 200 can obtain continuous power supply at different positions, effectively solving the problem of power interruption caused by the movement of the mechanism, ensuring the continuity and stability of the wire feeding process, and improving welding quality and efficiency.

[0063] In one embodiment, if Figure 6 As shown, the wire-filling welding device of the present invention further includes an operating mechanism 500. The operating mechanism 500 specifically includes a handle 510, a button 520, and a fixed head 530. The handle 510 forms a line protection space inside the welding torch. The function keys of the button 520 include but are not limited to forward rotation, reverse rotation, arc start / arc extinguishing of the rotating mechanism, wire feeding and wire withdrawal of the wire feeding mechanism, device rotation zero point, and gas inspection. The fixed head 530 is used to fix the water inlet pipe 150, electric wires, gas pipes and other pipelines to ensure that the pipelines do not loosen in the case of long cables.

[0064] The wire-filling welding device of the present invention uses a closed all-position pipe-to-pipe automatic welding machine as an integral structure, innovatively designs a micro wire feeder, and innovatively designs and uses arc-shaped wire inlet and outlet guide tubes. At the same time, the wire feeding mechanism 200 adopts a power supply method of a wire slide to achieve uninterrupted power supply for the wire feeding mechanism 200.

[0065] In combination with the above embodiments, taking the common specifications of the nuclear power thin-walled small pipe (diameter φ33.4mm, wall thickness 2.77mm) as an example, the use steps of the wire-filling welding device of the present invention are further described in detail:

[0066] Before welding, the pipe fittings to be welded need to be spot welded together. The I-type groove is used for the assembly, and the assembly gap is 0-0.5mm. After the assembly is completed and checked, proceed to the next step.

[0067] According to the device that meets the φ33.4 mm specification, the upper pipe clamp 431 and the lower pipe clamp 432 marked with φ33.4 mm are selected and installed at the corresponding positions of the upper shell 421 and the lower shell 422 respectively.

[0068] The filler wire welding device is turned on, and the button 520 is used to “forward” or “reverse” 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 inlet guide tube 220 and the wire outlet guide tube 230 marked with φ33.4 mm and install them on the wire feeding mechanism 200, adjust the extension length of the tungsten electrode 10, and ensure an effective distance of 10-12 mm between the tungsten electrode 10 and the second wire outlet nozzle 232 of the wire outlet guide tube 230. Cut the corresponding length of welding wire from the welding wire reel according to the corresponding welding wire length of the tube diameter φ33.4 mm, insert it from the end of the wire inlet guide tube 220, and use the "wire inlet" button 520 on the handle 510 to adjust the welding wire to extend about 2-3 mm from the second wire outlet nozzle 232 of the wire outlet guide tube 230.

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

[0071] Place the assembled pipe fittings to be welded into the corresponding pipe clamp positions, adjust the weld position surface of the pipe fittings to be welded to coincide with the rotation surface of the welding torch tungsten electrode 10, and after checking that everything is correct, rotate the upper shell 421 to coincide with the end surface of the lower shell 422, and use the locking clamp 441 to lock the upper shell 421 and the lower shell 422.

[0072] The welding process parameters corresponding to the welding are set on the welding control interface, and after the setting is completed, the welding is started by pressing the "welding start / stop" button 520 on the handle 510. The welding process does not require operator intervention. After the welding is completed, the rotating mechanism 100 automatically resets.

[0073] After waiting for the protective gas switch of the equipment to be turned off and waiting for the temperature of the pipeline to drop, the upper pipe clamp 431 and the lower pipe clamp 432 are opened, and the welded pipeline is taken out to complete the welding.

[0074] The wire-filling welding device of the present invention can realize automatic welding of nuclear power thin-walled small tube welding joints in which the inner and outer walls are higher than the tube walls. Different upper tube clamps 431 and lower tube clamps 432 are used to adapt to different specifications of 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 filling welding in the narrow cavity of the closed automatic welding equipment.

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

[0076] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A filler wire welding device, characterized in that: The wire-filling welding device comprises a welding torch, a pipe locking mechanism, a handle and a wire feeding mechanism; wherein, The pipe fitting locking mechanism is used to clamp the pipe fitting to be welded, and the pipe fitting locking mechanism clamping the pipe fitting to be welded forms a closed cavity at the weld of the pipe fitting to be welded; The welding torch comprises a tungsten electrode, the wire feeding mechanism is loaded with welding wire matching the welding seam filling amount, and during the welding process, the tungsten electrode, the wire feeding mechanism and the welding wire are located in the closed cavity; The tungsten electrode and the wire feeding mechanism can rotate along the circumference of the pipe to be welded, so as to weld the weld seam of the pipe to be welded in the closed cavity.

2. The filler wire welding device according to claim 1, characterized in that: The wire feeding mechanism comprises a wire feeding drive and a wire feeding assembly; The wire feeding assembly is arranged on the wire feeding driving member, and the wire feeding driving member can drive the wire feeding assembly to rotate along the circumferential direction of the pipe to be welded; The wire feeding assembly includes a welding wire conveying member and a welding wire guide member; The inlet end of the welding wire guide is used for loading welding wire, and the outlet end of the welding wire guide is arranged 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.

3. The filler wire welding device according to claim 2, characterized in that: The welding wire guide comprises a wire inlet guide tube and a wire outlet guide tube; The first wire inlet nozzle of the wire inlet guide tube is used for loading welding wire, and the first wire outlet nozzle of the wire inlet guide tube is arranged opposite to the welding wire conveying member; The second wire inlet nozzle of the wire outlet guide tube is arranged relative to the welding wire conveying member, and the second wire outlet nozzle of the wire outlet guide tube is arranged relative to the tungsten electrode; The welding wire conveying member includes a transmission wheel, and during the rotation of the transmission wheel, the welding wire is conveyed from the first wire outlet nozzle of the wire inlet guide tube to the second wire inlet nozzle of the wire outlet guide tube.

4. The filler wire welding device according to claim 3, characterized in that: The wire feeding guide tube is arc-shaped.

5. The filler wire welding device according to claim 3, characterized in that: The length of the wire feed guide tube is adapted to the space of the closed cavity and the length of the welding wire required by the pipe to be welded.

6. The filler wire welding device according to claim 3, characterized in that: The second wire outlet nozzle of the wire outlet guide tube can be operably moved relative to the tungsten electrode to adjust the distance between the tungsten electrode and the second wire outlet nozzle of the wire outlet guide tube.

7. The filler wire welding device according to claim 2, characterized in that: The wire feeding mechanism also includes a heat insulating member; The heat insulation member is arranged on the wire feeding drive member; During the welding process, the heat insulating member is located between the pipe to be welded and the wire driving member to reduce heat radiation to the wire driving member.

8. The filler wire welding device according to any one of claims 1 to 7, characterized in that: The pipe locking mechanism comprises a base, a shell assembly and a pipe clamp assembly; The housing assembly comprises an upper housing and a lower housing, wherein the lower housing is disposed on the base, and the upper housing is openably disposed on the upper housing; The pipe clamp assembly comprises an upper pipe clamp and a lower pipe clamp, wherein 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 that matches the pipe diameter of the pipe to be welded.

9. The filler wire welding device according to claim 8, characterized in that: There are two of each of the housing assembly and the pipe clamp assembly; 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.

10. The filler wire welding device according to claim 8, characterized in that: The filler wire welding device further includes a power supply mechanism, and the power supply mechanism is located in the closed cavity; The power supply mechanism includes a conductive structure and a contactor; The conductive structure is electrically connected to the power source, and the contactor is electrically connected to the wire feeding mechanism, thereby providing power to the wire feeding mechanism; The contactor is in sliding contact with the conductive structure, and the contactor can rotate along with the wire feeding mechanism during the rotation of the wire feeding mechanism.

11. The filler wire welding device according to claim 10, characterized in that: The conductive structure includes a first conductive portion and a second conductive portion; The first conductive part is arranged on the inner peripheral wall of the upper shell, and the second conductive part is arranged on the inner peripheral wall of the lower shell; When the upper housing and the lower housing are closed, the first conductive part and the second conductive part are connected to form a ring-shaped conductive structure, so that the contactor can slide around the connected first conductive part and the second conductive part.

12. The filler wire welding device according to claim 11, characterized in that: The first conductive part and the second conductive part each include at least one sliding wire groove; The wire slot of the second conductive part is electrically connected to the power supply, and at least one end of the wire slot of the second conductive part is provided with an elastic contact; When the upper housing and the lower housing are closed, the elastic contact contacts the wire groove of the first conductive part, so that the first conductive part and the second conductive part are conductive.

13. The filler wire welding device according to any one of claims 1 to 7, characterized in that: The wire-filling welding device further comprises a rotating mechanism for driving the tungsten electrode and the wire feeding mechanism to rotate together; The rotating mechanism includes a rotating driving member, a transmission gear assembly and an open gear; The transmission gear assembly is in transmission connection with the rotary drive member, the open gear is in transmission connection with the transmission gear assembly, and the tungsten electrode and the wire feeding mechanism are arranged on the open gear; The rotary drive 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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