A welding protection device for zirconium-titanium composite welded pipe

Abstract

This invention discloses a welding protection device for zirconium-titanium composite welded pipes, relating to the field of welding technology. It includes an argon-filling assembly within the welding machine housing, supplying high-purity argon gas through an argon storage tank to apply gas protection conditions to the welding area of ​​the zirconium-titanium composite welded pipe. An argon arc welding torch with a tungsten electrode is engaged via a holder on an external protrusion, allowing for tungsten inert gas (TIG) welding of the zirconium-titanium composite welded pipe. A simulated hand on an angle motor at the switching assembly rotates and switches between titanium and zirconium welding wires, providing solder compensation to the welding area of ​​the zirconium-titanium composite welded pipe. This invention utilizes self-sufficient high-purity argon gas as the protective gas, employing a combination of pre-filling and concentration detection to apply high-purity argon gas protection conditions to the V-groove welding area of ​​the zirconium-titanium composite pipe. Pre-filling with high-purity argon gas expels and removes air from the welding area, isolating the weld from air throughout the process and preventing severe oxidation at the weld root.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding protection device for zirconium-titanium composite welded pipes. Background Technology

[0002] Zirconium-titanium composite pipe: In the past, pure zirconium plates were used for manufacturing. Now, zirconium-titanium composite plates are used. Titanium serves as the base layer to bear the strength, while zirconium serves as the coating to resist corrosion, achieving the same performance. However, since titanium is cheaper than zirconium, a lot of costs can be saved. At the same time, since titanium and zirconium are elements in the same group, the two metals are mutually soluble, which solves the problem of welding the two metals together.

[0003] During the welding of zirconium-titanium composite tubes, a V-shaped groove with a blunt edge is formed in the weld area of ​​the zirconium and titanium tubes. The V-shaped groove is divided into three areas: the titanium side base material area, the intermediate transition mixing area, and the zirconium side base material area. This process is usually done manually by placing the titanium / zirconium welding wire in the welding area of ​​the welding gun. This is not only troublesome and time-consuming, but also prone to untimely wire feeding, weld interruption, and weld quality problems. It also poses a risk of burns. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing welding protection devices for zirconium-titanium composite welded pipes, the present invention is proposed.

[0006] Therefore, the problem to be solved by this invention is how to solve the problem of the V-groove welding zone of traditional zirconium-titanium composite tubes, and adaptively perform uninterrupted wire feeding operation on titanium / zirconium welding wire.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a welding protection device for zirconium-titanium composite welded pipes, comprising an argon filling component in the welding machine box, providing high-purity argon gas supply through an argon storage tank to apply gas protection conditions to the welding area of ​​the zirconium-titanium composite welded pipe, and a tungsten electrode-equipped argon arc welding gun is engaged with a mounting bracket on the external protrusion to weld the zirconium-titanium composite welded pipe using tungsten inert gas welding, and a simulated hand on the angle motor at the switching component to rotate and switch the titanium welding wire and zirconium welding wire to provide solder compensation for the welding area of ​​the zirconium-titanium composite welded pipe, and a main feed plate on the servo motor at the feeding component to apply frictional transmission force to the titanium welding wire and zirconium welding wire and feed them to the welding area of ​​the argon arc welding gun.

[0008] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, the argon filling assembly further includes a pressure sensor embedded in the argon storage tank, and a filling elbow with a shut-off valve is connected to the outer end of the argon storage tank, and the filling elbow is unidirectionally connected to an external argon gas pipeline.

[0009] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, the welding machine box is equipped with a circulating air pump that is connected to an argon storage tank, and the outer end of the circulating air pump is connected to an electrically controlled valve, on which a flow sensor is embedded.

[0010] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes according to the present invention, wherein: the bottom end of the electrically controlled valve is connected to a metal hose and is suspended by a suspension bracket fixed on the welding machine box, and the outer end of the metal hose is connected to an extension pipe; the extension pipe is covered with a sealing cap that seals the outer end of the zirconium-titanium composite welded pipe, and an expansion sealing ring is provided annularly on the inner side of the sealing cap and is fitted with the outer end of the zirconium-titanium composite welded pipe by an interference fit, and the extension pipe is provided with spray holes in a triangular equidistant inclined shape.

[0011] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipe described in this invention, a gas monitor is embedded in the welding machine housing, and a wire is provided on the outside of the gas monitor and is wound by a winding frame fixed on the welding machine housing, and a detection probe is provided at the outer end of the wire; a detection cover is provided at the outer end of the detection probe to seal the outer end of the zirconium-titanium composite welded pipe, and an expansion sealing ring is provided in an annular shape on the inner side of the detection cover, and is fitted with the outer end of the zirconium-titanium composite welded pipe by interference fit.

[0012] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, the switching component further includes an angle sensor embedded between the angle motor and the simulated hand, and a wire-threading tube is inserted into the simulated hand; the two wire-threading tubes have wire-threading cavities and are in contact with the titanium welding wire and the zirconium welding wire for transmission, and the top of the wire-threading cavity has an arc-shaped chamfer for guiding and transmitting the titanium welding wire and the zirconium welding wire.

[0013] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, the outer ends of the two wire-threading pipes are respectively fitted with titanium wire wheels and zirconium wire wheels through bearing seats, and are wound with titanium welding wire and zirconium welding wire. A tightening groove is provided in the bearing seat, and a tightening head that abuts against the titanium wire wheel and zirconium wire wheel is threadedly connected in the tightening groove.

[0014] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, the feeding assembly further includes an auxiliary feeding disc driven on the outside of the titanium welding wire and the zirconium welding wire, and is distributed in an axisymmetric manner with the main feeding disc on the servo motor; the main feeding disc and the auxiliary feeding disc are provided with friction tooth grooves on their circumferences for meshing and driving with the titanium welding wire and the zirconium welding wire.

[0015] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, a ratchet is provided in the auxiliary feeding disc via a concentric shaft, and a pawl that is hinged to the wire threading tube is fastened on the ratchet. A compression spring that is inclinedly fixed to the wire threading tube is fixed on the outer side of the pawl. A knob is fixed on the outer side of the pawl via a lever, and an anti-slip groove is provided on the circumference of the knob.

[0016] As a preferred embodiment of the welding protection device for zirconium-titanium composite welded pipes described in this invention, in which: both sides of the two wire-threading tubes are embedded with through-beam photoelectric sensors that extend into the wire-threading cavity and are symmetrically located on the outside of the titanium welding wire and the zirconium welding wire; the welding machine box is embedded with an industrial camera for monitoring the welding of the argon arc welding gun, titanium welding wire and zirconium welding wire.

[0017] The beneficial effects of this invention are as follows: Based on self-sufficient high-purity argon gas as a protective gas, a combination of pre-filling and concentration detection is used to apply high-purity argon gas protection to the V-groove welding area of ​​the zirconium-titanium composite tube. Pre-filling with high-purity argon gas squeezes out and removes all air from the welding area, isolating the area from air throughout the process and preventing severe oxidation at the weld root. Simultaneously, a combination of switching wire feeding and transmission wire feeding is used to apply titanium welding wire, zirconium welding wire, or titanium / zirconium welding wire to the three welding areas of the V-groove, forming a titanium + zirconium solid solution transition layer. This allows for reasonable control of the fusion ratio, reducing the brittle phase in the zirconium-titanium composite tube welding area, and solving the problem of untimely wire feeding caused by manual wire feeding, which leads to weld discontinuity and weld quality problems, thus enhancing safety. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a switching welding diagram of the outer edge zone of the V-groove used for welding protection devices in zirconium-titanium composite welded pipes.

[0020] Figure 2 This is a welding diagram of the intermediate transition mixing zone of the V-groove used as a welding protection device for zirconium-titanium composite welded pipes.

[0021] Figure 3 Side view of the welding machine housing and argon filling assembly for the welding protection device used in zirconium-titanium composite welded pipes.

[0022] Figure 4 A bottom view of the argon-filling assembly for a welding protection device used in zirconium-titanium composite welded pipes.

[0023] Figure 5 Rear view of the argon-filling assembly for a welding protection device used in zirconium-titanium composite welded pipes.

[0024] Figure 6 Exploded view of the welding machine housing, argon arc welding torch, switching assembly, and feeding assembly for the welding protection device used in zirconium-titanium composite welded pipes.

[0025] Figure 7 This is a partial enlarged cross-sectional view of the switching and feeding components of the welding protection device used for zirconium-titanium composite welded pipes.

[0026] Figure 8 A partial rear view of the feed assembly for a welding protection device used in zirconium-titanium composite welded pipes.

[0027] In the diagram: 1. Welding machine housing; 21. Argon storage tank; 22. Circulating gas pump; 23. Electrically controlled valve; 24. Metal hose; 25. Sealing cap; 26. Extension tube; 27. Injection orifice; 3. Pressure sensor; 4. Filling elbow; 5. Flow sensor; 6. Gas monitor; 7. Wire; 8. Winding rack; 9. Detection cover; 10. Detection probe; 11. Outer protrusion; 12. Clamping seat; 13. Tungsten electrode; 14. Argon arc welding torch; 15. Angle motor; 1 52. Simulated hand; 153. Angle sensor; 154. Wire threading tube; 155. Wire threading cavity; 156. Titanium wire wheel; 157. Zirconia wire wheel; 16. Titanium welding wire; 17. Zirconia welding wire; 18. Tightening head; 191. Servo motor; 192. Main feed plate; 193. Auxiliary feed plate; 194. Ratchet; 195. Pawl; 196. Compression spring; 197. Knob; 198. Friction tooth groove; 199. Through-beam photoelectric sensor; 20. Industrial camera. Detailed Implementation

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0031] Example 1, referring to Figures 1 to 8 This is the first embodiment of the present invention, which provides a welding protection device for zirconium-titanium composite welded pipes. It includes an argon filling component in the welding machine box 1, which provides a high-purity argon gas supply through an argon storage tank 21. The protective gas is 99.999% high-purity argon gas. Based on the self-sufficient high-purity argon gas as the protective gas, a combination of pre-filling and concentration detection is used to apply high-purity argon gas protection conditions to the V-groove welding area of ​​the zirconium-titanium composite pipe. Pre-filling with high-purity argon gas squeezes out and removes the air in the welding area, isolating the air throughout the process and avoiding severe oxidation at the root of the weld.

[0032] The TIG welding torch 14 with a tungsten electrode 13 is engaged with the retainer 12 on the external protrusion 11. The zirconium-titanium composite welded pipe is welded using the tungsten inert gas (TIG) welding method. The retainer 12 facilitates quick assembly and disassembly of the TIG welding torch 14. The top of the TIG welding torch 14 is unidirectionally connected to an external argon gas pipeline, allowing high-purity argon gas to be ejected from the nozzle of the TIG welding torch 14. This forces the V-shaped bevel welding area on the outer layer of the zirconium-titanium composite pipe to have a high-purity argon gas protection function. The high-purity argon gas ejected from the nozzle of the TIG welding torch 14 also isolates the air in the tungsten electrode 13 area, simultaneously slowing down the erosion rate of the tungsten electrode 13 in the TIG welding torch 14 area caused by air oxidation. This provides gas protection for the welding area of ​​the TIG welding torch 14 and the tungsten electrode 13.

[0033] Specifically, it also includes a pressure sensor 3 embedded in the argon storage tank 21. The argon storage tank 21 is divided into upper and lower tanks, both of which are embedded in the welding machine box 1. A filling elbow 4 with a shut-off valve is connected to the outer end of the argon storage tank 21. The filling elbow 4 is unidirectionally connected to the external argon gas pipeline. The pressure sensor 3 monitors the high-purity argon gas that has been pre-filled in the two sets of argon storage tanks 21 in real time, so that the external unidirectional argon gas pipeline can replenish the high-purity argon gas in the two sets of argon storage tanks 21 in a timely manner through the filling elbow 4, ensuring that the high-purity argon gas is always kept in a sufficient state.

[0034] The welding machine housing 1 is equipped with a circulating gas pump 22 that is connected to the argon storage tank 21. The outer end of the circulating gas pump 22 is connected to an electric control valve 23. The electric control valve 23 is equipped with a flow sensor 5. The flow sensor 5 on the electric control valve 23 monitors the flow rate of high-purity argon gas flowing through the electric control valve 23 area in real time to ensure a quantitative supply of high-purity argon gas. It works in conjunction with the high-purity argon gas on the argon arc welding torch 14 to form a dual high-purity argon gas protection mechanism for the three welding areas of the V-shaped bevel inside and outside the zirconium-titanium composite tube.

[0035] Specifically, the bottom end of the solenoid valve 23 is connected to a metal hose 24. The opening and closing of the metal hose 24 is adaptively controlled by the solenoid valve 23, and it is suspended by a hanger fixed on the welding machine housing 1. The hanger facilitates the suspension and storage of the metal hose 24, reducing the floor space occupied and avoiding interference during the welding of the zirconium-titanium composite tube. The outer end of the metal hose 24 is connected to an extension tube 26, which is as close as possible to the V-groove welding area of ​​the zirconium-titanium composite tube. This facilitates the continuous supply of high-purity argon gas to the V-groove welding area, enhances the air expulsion and venting effect in this area, and continuously provides gas protection to the V-groove welding area during welding.

[0036] The extension tube 26 is covered with a sealing cap 25 that seals the outer end of the zirconium-titanium composite welded tube. The sealing cap 25 is snapped into place by a placement rack fixed to the outside of the welding machine box 1. The sealing cap 25 seals one end of the zirconium-titanium composite welded tube. An expansion sealing ring is provided on the inner side of the sealing cap 25 and is fitted with the outer end of the zirconium-titanium composite welded tube in an interference fit. The expansion sealing ring, which is fitted in an interference fit, enhances the sealing performance between the sealing cap 25 and one end of the zirconium-titanium composite welded tube, preventing the leakage of high-purity argon gas. The extension tube 26 is provided with injection holes 27 in a triangular equidistant angle.

[0037] In use, first, attach the sealing cap 25 to one end of the zirconium-titanium composite tube, then turn on the circulating air pump 22 and supply the high-purity argon gas that has been pre-filled in the two sets of argon storage tanks 21 through the opened electric control valve 23 into the metal hose 24. Then, through the injection holes 27 on the extension tube 26 that are inclined towards the V-groove welding area, the high-purity argon gas is continuously injected from one end of the zirconium-titanium composite tube through the V-groove welding area and is discharged from the other end of the zirconium-titanium composite tube.

[0038] During this period, high-purity argon gas provides gas protection to the V-groove welding area from the inner layer in advance and continuously. Simultaneously, the argon arc welding gun 14 is turned on, and the tungsten electrode 13 is used to perform welding operations on the V-groove welding area using tungsten inert gas (TIG) welding. At the same time, high-purity argon gas from another external argon gas channel is sprayed from the outside to the zirconium-titanium composite tube V-groove welding area. Combined with the high-purity argon gas protection applied from the inside and outside, the argon arc welding gun 14 achieves a high-protection welding effect.

[0039] Preparation before welding: Tungsten electrode: The tungsten electrode 13 is Φ2.4, and the end of the tungsten electrode 13 is ground into a sharp cone.

[0040] Cleaning: Sand the V-shaped bevel and the 25mm area on both sides, degrease with acetone, and remove oxide scale and water stains.

[0041] Gas path: One path of high-purity argon gas is inside the unidirectional zirconium-titanium composite welded tube 26, and another path of high-purity argon gas is provided on the argon arc welding torch 14. The two independent high-purity argon gas paths are sprayed from the front with the nozzle of the argon arc welding torch 14 and pre-charged for 10-15 minutes with back protection inside the tube. The oxygen content is <20ppm. Double high-purity argon gas protection is applied to the inner and outer layers of the zirconium-titanium composite welded tube in advance.

[0042] Furthermore, during the tungsten inert gas (TIG) welding process, the argon arc welding torch 14 continuously supplies high-purity argon gas to isolate oxygen inside and outside the welding tube, prevent severe oxidation at the weld root, prevent nitrogen intrusion, eliminate porosity at the weld root, ensure the mechanical properties of the weld root, prevent brittle fracture, and cooperate with the welding area of ​​the welding tube to form the root pass, avoiding slag inclusions and pits at the weld root.

[0043] Furthermore, after the argon arc welding torch 14 completes the tungsten inert gas welding, the supply of high-purity argon gas cannot be stopped immediately. Because after the argon arc welding torch 14 extinguishes the arc, the root of the weld seam of the welded pipe is still at a high temperature. Argon must be kept in place until the welded pipe wall cools down to below 300°C before the gas circuit is closed and the supply of high-purity argon gas is stopped to prevent the welding area from absorbing air and oxidizing during the cooling process.

[0044] Windproof: Welded inside a sealed windproof canopy, with a wind speed of <0.5m / s.

[0045] Specifically, a gas monitor 6 is embedded in the welding machine housing 1, and a wire 7 is provided on the outside of the gas monitor 6. The wire is wound by a winding frame 8 fixed on the welding machine housing 1, and a detection probe 10 is provided at the outer end of the wire 7. The detection probe 10 is used to detect the air concentration discharged from the other end of the zirconium-titanium composite tube, especially the discharge concentration of high-purity argon, to ensure that the air in the zirconium-titanium composite tube is fully squeezed and discharged.

[0046] The outer end of the detection probe 10 is provided with a detection cover 9 that seals the outer end of the zirconium-titanium composite welded tube. The other end of the zirconium-titanium composite tube is clamped through the detection cover 9. The detection cover 9 is clamped and placed by a second placement rack fixed on the outside of the welding machine box 1. An exhaust hole is provided on the circumference of the detection cover 9. The exhaust hole provides a channel for the air in the zirconium-titanium composite tube to be vented, and prevents the high-purity argon gas from flowing back into the zirconium-titanium composite tube when it is squeezed out. An expansion sealing ring is provided on the inner side of the detection cover 9 and is fitted with the outer end of the zirconium-titanium composite welded tube by an interference fit. The expansion sealing ring with an interference fit enhances the clamping stability between the detection cover 9 and the other end of the zirconium-titanium composite tube.

[0047] Both expansion sealing rings one and two are made of high-temperature resistant rubber. Although expansion sealing rings one and two are far from the welding area of ​​the zirconium-titanium composite pipe, the central temperature generated by welding in the zirconium-titanium composite pipe welding area will be conducted to the pipe end area, and high temperature will still remain. Therefore, expansion sealing rings one and two made of high-temperature resistant rubber can resist the residual temperature conducted to both ends of the zirconium-titanium composite pipe, effectively ensuring a tight fit between the two ends of the zirconium-titanium composite pipe. External clamps can also be fitted around the outer rings of expansion sealing rings one and two to enhance the stability of the fit between expansion sealing rings one and two and the two ends of the zirconium-titanium composite pipe, preventing loosening and detachment due to excessive pressure impact inside the pipe.

[0048] In use, when high-purity argon gas is injected from one end of the zirconium-titanium composite tube through the injection hole 27 on the extension tube 26, the detection cover 9 is also successively locked to the other end of the zirconium-titanium composite tube. The air inside the zirconium-titanium composite tube is vented out of the exhaust hole by the injected high-purity argon gas. The gas monitor 6 controls the detection probe 10 through the wire 7 to detect the air vented out of the zirconium-titanium composite tube by the high-purity argon gas, as well as the argon gas concentration, to ensure that the argon gas purity inside the zirconium-titanium composite tube meets the standard and meets the argon gas protection requirements of the inner layer of the V-groove welding area. The results are displayed by the gas monitor 6.

[0049] Example 2, refer to Figures 1 to 8 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0050] The simulated hand 152 on the angle motor 151 at the switching component rotates and switches between titanium welding wire 16 and zirconium welding wire 17, providing solder compensation for the welding area of ​​the zirconium-titanium composite welded pipe. Titanium welding wire 16 conforms to NB / T47018.7 standard, and zirconium welding wire 17 conforms to NB / T47018.8 standard. The switching wire supply method is based on the distribution of the three welding areas of the V-groove. When welding the titanium side base material area, the same titanium welding wire as the zirconium tube base material must be used for switching and overlapping. In the zirconium side base material area, the same zirconium welding wire as the titanium tube base material must be used for switching and overlapping. Especially in the intermediate transition mixing area, titanium welding wire and zirconium welding wire must be used for synchronous overlapping, replacing manual wire feeding operation, avoiding weld interruption due to untimely wire feeding, which would reduce weld quality and improve safety.

[0051] Specifically, it also includes an angle sensor 153 embedded between the angle motor 151 and the simulated hand 152, and a wire-threading tube 154 is inserted into the simulated hand 152. The welding area of ​​the zirconium-titanium composite tube forms a V-shaped bevel, and the bevel angle of the V-shaped bevel is 60°, the blunt edge is 1.0 to 1.5 mm, and the gap between the joints is 2.0 mm.

[0052] The V-groove is divided into three regions laterally: the titanium-side base material region, which is located in the middle third of the V-groove; the intermediate transition and mixing region, which is located in the middle third of the V-groove; and the zirconium-side base material region, which is located in the middle third of the V-groove. Based on these three welding regions, two sets of angle motors 151 drive the simulation hand 152 to thread the wire tube 154 and the titanium welding wire 16 and zirconium welding wire 17 inside, and adaptively switch them to meet the welding material feeding requirements of different materials of welding wires in the three welding regions of the V-groove.

[0053] Two wire-feeding tubes 154 have wire-feeding cavities 155, which are in contact with the titanium welding wire 16 and the zirconium welding wire 17 for transmission. The titanium welding wire 16 and the zirconium welding wire 17 are driven by a transition method with the wire-feeding cavity 155, which is conducive to the stable transmission and wire feeding operation of the titanium welding wire 16 and the zirconium welding wire 17 in the wire-feeding cavity 155. The top of the wire-feeding cavity 155 has an arc-shaped chamfer for guiding the titanium welding wire 16 and the zirconium welding wire 17, reducing the wear of the titanium welding wire 16 and the zirconium welding wire 17 and avoiding excessive wear and breakage during transmission.

[0054] The outer ends of the two wire-threading tubes 154 are respectively fitted with titanium wire wheels 156 and zirconium wire wheels 157 through bearing seats. The titanium welding wire 16 and zirconium welding wire 17 are pre-wound to provide the welding material of titanium welding wire 16 and zirconium welding wire 17 for the three welding zones of the V-groove of the argon arc welding gun 14. The wires are also wound with titanium welding wire 16 and zirconium welding wire 17. A tightening groove is provided in the bearing seat, and a tightening head 18 is threaded into the tightening groove to abut against the titanium wire wheel 156 and zirconium wire wheel 157. The tightening groove and tightening head 18 facilitate quick replacement of titanium wire wheel 156 and zirconium wire wheel 157.

[0055] When welding the titanium-side base material area of ​​the V-groove, the angle motor 151 of the titanium wire wheel 156 area is turned on, and the simulated hand 152 on it drives the titanium wire wheel 156 and titanium welding wire 16 on the wire tube 154 in that area to switch to the nozzle of the argon arc welding gun 14, forming a welding angle for the titanium-side base material area of ​​the V-groove. At this time, the zirconium wire wheel 157 and the zirconium welding wire 17 in the wire tube 154 are away from the nozzle of the argon arc welding gun 14. The argon arc welding gun 14 will switch to the titanium welding wire 16, and fill the titanium-side base material area of ​​the V-groove with high-purity titanium welding wire 16 of the same material as the titanium base material tube, making the filler in the titanium-side base material area of ​​the V-groove more even.

[0056] When welding is required on the zirconium-side base material area of ​​the V-groove, the angle motor 151 of the zirconium wire wheel 157 area is turned on, and through the simulation hand 152 on it, the zirconium wire wheel 157 and the zirconium welding wire 17 on the wire tube 154 of this area are switched to the nozzle of the argon arc welding gun 14, and a welding angle is formed for the zirconium-side base material area of ​​the V-groove. At this time, the titanium wire wheel 156 and the titanium welding wire 16 in the wire tube 154 are moved away from the nozzle of the argon arc welding gun 14. The argon arc welding gun 14 will switch to the zirconium welding wire 17, and from the root of the V-groove on the zirconium base material tube side, only the high-purity zirconium welding wire 17 of the same material as the zirconium base material tube is used to fill the filler in the zirconium-side base material area of ​​the V-groove, so that it tends to be flat.

[0057] When welding the intermediate transition mixing zone of the V-groove, the angle motor 151 of the titanium wire wheel 156 and zirconium wire wheel 157 is adjusted inward simultaneously. Through the simulation hand 152 on it, the titanium wire wheel 156 and zirconium wire wheel 157 on the two wire tubes 154 and the titanium welding wire 16 and zirconium welding wire 17 inside are switched to the nozzle of the argon arc welding gun 14. A bidirectional welding angle is formed for the intermediate transition mixing zone of the V-groove. The argon arc welding gun 14 will be switched to the titanium welding wire 16 and zirconium welding wire 17. From the root of the intermediate transition mixing zone of the zirconium-titanium base tube, the same high-purity titanium welding wire 16 and zirconium welding wire 17 as the zirconium-titanium base tube material is used to fill the weld, fill the intermediate transition mixing zone of the V-groove, and make it more even.

[0058] Meanwhile, at the root of the titanium base material tube in the intermediate transition mixing zone of the V-groove, a small amount of titanium welding wire 16 is first used for overlapping welding to form a titanium alloy buffer layer. At the root of the zirconium base material tube in the intermediate transition mixing zone of the V-groove, zirconium welding wire 17 is not directly laid. Instead, a small amount of titanium molten metal is first overlapped. Zirconium melt is strictly prohibited from directly contacting the titanium base material molten pool to avoid large-area mutual dissolution between liquid zirconium and liquid titanium.

[0059] The main feed plate 192 on the servo motor 191 of the feeding component applies frictional transmission force to the titanium welding wire 16 and zirconium welding wire 17 and feeds them to the welding area of ​​the argon arc welding gun 14. Based on the meshing friction force, the transmission wire feeding method is adopted to feed the titanium welding wire 16 and zirconium welding wire 17 that have been switched to the position of single lap / synchronous superimposed lap into place. This replaces the frequent manual handling / replacement of titanium welding wire 16 and zirconium welding wire 17, reduces the replacement frequency of titanium welding wire 16 and zirconium welding wire 17, and forces the weld in the V-groove welding area to be more continuous and uninterrupted, resulting in better welding quality.

[0060] Specifically, it also includes an auxiliary feed plate 193 that drives the titanium welding wire 16 and zirconium welding wire 17 on the outside, and is distributed in an axisymmetric state with the main feed plate 192 on the servo motor 191. By adopting the axisymmetric distribution of the main feed plate 192 and the auxiliary feed plate 193, the main feed plate 192 is the driving plate and the auxiliary feed plate 193 is the stabilizing plate, and a uniform transmission force is applied to the titanium welding wire 16 and zirconium welding wire 17 in the wire threading cavity 155 of the two wire threading tubes 154, forcing the titanium welding wire 16 and zirconium welding wire 17 inside to be fed downwards evenly, so as to ensure the stability and smoothness of the wire feeding action.

[0061] The main feed plate 192 and the auxiliary feed plate 193 are provided with friction grooves 198 on their circumferences for meshing and transmission with the titanium welding wire 16 and the zirconium welding wire 17. Through the friction grooves 198, the transmission friction coefficient between the main feed plate 192 and the auxiliary feed plate 193 and the titanium welding wire 16 and the zirconium welding wire 17 is increased, which plays an anti-slip role and further improves the meshing transmission effectiveness of the titanium welding wire 16 and the zirconium welding wire 17, preventing the main feed plate 192 and the auxiliary feed plate 193 from spinning idly and the titanium welding wire 16 and the zirconium welding wire 17 from getting stuck.

[0062] Specifically, a ratchet 194 is installed inside the auxiliary feed plate 193 via a concentric shaft, and a pawl 195 is engaged with the wire threading tube 154 on the ratchet 194. A compression spring 196 is fixed to the outside of the pawl 195 and is inclinedly fixed to the wire threading tube 154. Through the ratchet 194, pawl 195 and compression spring 196, reverse restriction measures are applied to the auxiliary feed plates 193 on the two wire threading tubes 154 to prevent the titanium welding wire 16 and zirconium welding wire 17 passing through the auxiliary feed plate 193 from shifting back under force, thus ensuring the transmission effectiveness of the main feed plate 192 to the titanium welding wire 16 and zirconium welding wire 17 and facilitating the continuous supply of titanium welding wire 16 and zirconium welding wire 17.

[0063] A knob 197 is fixed to the outside of the pawl 195 via a lever. When a reverse restriction is applied to the auxiliary feed plate 193, the knob 197 moves synchronously with the pawl 195. When the reverse restriction is released, the knob 197 is turned to disengage the pawl 195 from the ratchet 194. An anti-slip groove is provided on the circumference of the knob 197 to increase the friction between the knob 197 and the hand and prevent slippage.

[0064] Specifically, two through-beam photoelectric sensors 199 are embedded on both sides of the two wire-feeding tubes 154 and extend into the wire-feeding cavity 155, symmetrically located on the outside of the titanium welding wire 16 and the zirconium welding wire 17. Through the two sets of through-beam photoelectric sensors 199, the titanium welding wire 16 and the zirconium welding wire 17 in the wire-feeding cavity 155 of the two wire-feeding tubes 154 are monitored for material shortage using through-beam sensing. If the photoelectric signals emitted by the two sets of through-beam photoelectric sensors 199 are blocked by the titanium welding wire 16 and the zirconium welding wire 17 under the wire feeding action, it means that there are still titanium welding wire 16 and zirconium welding wire 17 on the titanium wire wheel 156 and the zirconium wire wheel 157.

[0065] Conversely, when the photoelectric signals emitted by the two sets of through-beam photoelectric sensors 199 are received by each other without being blocked by the titanium welding wire 16 and the zirconium welding wire 17, it means that there is no titanium welding wire 16 and zirconium welding wire 17 on the titanium wire wheel 156 and the zirconium wire wheel 157. They are in a state of material shortage of titanium welding wire 16 and zirconium welding wire 17 and need to be replaced with new titanium wire wheel 156 and zirconium wire wheel 157.

[0066] An industrial camera 20 is embedded in the welding machine housing 1 to monitor the welding of the argon arc welding gun 14, titanium welding wire 16 and zirconium welding wire 17. Through the industrial camera 20, the welding images between the argon arc welding gun 14, titanium welding wire 16 and zirconium welding wire 17 in the three welding areas of the V-groove are tracked in real time to realize a visual monitoring mechanism and ensure the quality of tungsten inert gas welding in the welding area of ​​zirconium-titanium composite welded pipe.

[0067] Components near the welding area of ​​the argon arc welding torch 14 are made of high-temperature resistant materials, such as the housing of the simulation hand 152, the wire threading tube 154, and the through-beam photoelectric sensor 199. The high-temperature resistant materials are divided into high-temperature alloy metal materials, such as nickel-based high-temperature alloys and iron-based heat-resistant alloys, and ceramic and ceramic-based composite non-metallic materials, such as silicon carbide, alumina, and silicon nitride. The components near the welding area of ​​the argon arc welding torch 14 are treated with high-temperature resistant protection.

[0068] In use, the titanium-side base material area, zirconium-side base material area, and intermediate transition mixing area of ​​the V-groove of the zirconium-titanium composite welded pipe are used as the basis for correspondingly switching the titanium welding wire 16 and zirconium welding wire 17 in the wire threading tube 154 to the welding area. During the real-time tungsten inert gas welding operation by the argon arc welding gun 14, the servo motor 191 on the wire threading tube 154 that has been switched to the position is turned on and drives the main feed plate 192 to rotate. The main feed plate 192 is used as the main drive plate and the auxiliary feed plate 193 is used as the auxiliary drive plate. Then, the main feed plate 192 drives the switched titanium welding wire 16 and zirconium welding wire 17 to continuously drive downward in the wire threading cavity 155 in the wire threading tube 154, providing the titanium welding wire 16 and zirconium welding wire 17 welding material supply to the titanium-side base material area, zirconium-side base material area, and intermediate transition mixing area.

[0069] At the same time, when the main feed plate 192 drives the titanium welding wire 16 and zirconium welding wire 17 downward, the downward friction force generated by the titanium welding wire 16 and zirconium welding wire 17 forces the auxiliary feed plate 193 to rotate in opposite directions, which in turn drives the pawl 195 on the ratchet 194 to perform a tooth skipping action. The compression spring 196 provides elastic support for the pawl 195 during the tooth skipping, thereby applying reverse restriction measures to the auxiliary feed plate 193 and simultaneously forcing the titanium welding wire 16 and zirconium welding wire 17 to move downward steadily.

[0070] The argon arc welding gun 14 is used in a horizontal straight welding method, and the titanium welding wire 16 and zirconium welding wire 17 are fed in sections and welded in sections, one after another in a staggered manner.

[0071] Near the titanium base material area: Titanium welding wire 16 is used throughout the process, and the argon arc welding gun 14 is controlled to perform narrow-pass welding, occupying 1 / 3 of the V-groove width.

[0072] Near the intermediate transition mixing zone: alternate feeding of titanium welding wire 16 and zirconium welding wire 17, and control the argon arc welding gun 14 to perform narrow-pass lap welding to form a titanium + zirconium solid solution transition layer, which occupies 1 / 3 of the V-groove width. Control the fusion ratio, reduce the brittle phase, and overlap 2-3mm at the weld centerline to achieve a smooth transition. It is strictly forbidden to add two types of welding wire continuously in one weld pass at the same time.

[0073] Near the zirconium base material area: Zirconium welding wire 17 is used throughout the process, and the TIG welding gun 14 is controlled to perform narrow-channel welding, occupying 1 / 3 of the V-groove width. Then, the welding area of ​​the zirconium-titanium composite tube is divided into three equal parts for TIG welding.

[0074] Key points of operation: Narrow weld beads, no wobbling or only slight wobbling, each bead width ≤8mm, reduce molten pool stirring.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A welding protection device for zirconium-titanium composite welded pipes, characterized in that: The assembly includes an argon filling component inside the welding machine housing (1), which supplies high-purity argon gas through an argon storage tank (21) to provide gas protection conditions for the welding area of ​​the zirconium-titanium composite welded pipe. The argon arc welding gun (14) with a tungsten electrode (13) is attached to the mounting bracket (12) on the outer protrusion (11) to weld the zirconium-titanium composite welded pipe using tungsten inert gas welding. The simulated hand (152) on the angle motor (151) at the switching component rotates and switches the titanium welding wire (16) and zirconium welding wire (17) to provide welding material compensation for the welding area of ​​the zirconium-titanium composite welded pipe. The main feed plate (192) on the servo motor (191) at the feeding component applies friction transmission force to the titanium welding wire (16) and zirconium welding wire (17) and feeds the material to the welding area of ​​the argon arc welding gun (14).

2. The welding protection device for zirconium-titanium composite welded pipes as described in claim 1, characterized in that: The argon filling assembly also includes a pressure sensor (3) embedded in the argon storage tank (21), and a filling elbow (4) with a shut-off valve is connected to the outer end of the argon storage tank (21), and the filling elbow (4) is unidirectionally connected to the external argon gas pipeline.

3. The welding protection device for zirconium-titanium composite welded pipes as described in claim 1, characterized in that: The welding machine box (1) is equipped with a circulating air pump (22) that is connected to the argon storage tank (21), and the outer end of the circulating air pump (22) is connected to an electric control valve (23), and the electric control valve (23) is equipped with a flow sensor (5).

4. The welding protection device for zirconium-titanium composite welded pipes as described in claim 3, characterized in that: The bottom end of the electric control valve (23) is connected to a metal hose (24) and is suspended by a hanger fixed on the welding machine box (1), and the outer end of the metal hose (24) is connected to an extension pipe (26). The extension tube (26) is covered with a sealing cap (25) that seals the outer end of the zirconium-titanium composite welded tube. An expansion sealing ring is provided on the inner side of the sealing cap (25) and is fitted with the outer end of the zirconium-titanium composite welded tube in an interference fit. The extension tube (26) is provided with spray holes (27) in a triangular equidistant shape.

5. The welding protection device for zirconium-titanium composite welded pipes as described in claim 1, characterized in that: A gas monitor (6) is embedded in the welding machine box (1), and a wire (7) is provided on the outside of the gas monitor (6), and is wound by a winding frame (8) fixed on the welding machine box (1), and a detection probe (10) is provided at the outer end of the wire (7). The outer end of the detection probe (10) is provided with a detection cover (9) that seals the outer end of the zirconium-titanium composite welded pipe, and an expansion sealing ring II is provided on the inner side of the detection cover (9), which is fitted with the outer end of the zirconium-titanium composite welded pipe by interference fit.

6. The welding protection device for zirconium-titanium composite welded pipes as described in claim 1, characterized in that: The switching assembly also includes an angle sensor (153) embedded between the angle motor (151) and the simulated hand (152), and a wire-threading tube (154) is inserted into the simulated hand (152). The two wire-threading tubes (154) have wire-threading cavities (155) that fit and drive the titanium welding wire (16) and zirconium welding wire (17). The top of the wire-threading cavity (155) has an arc-shaped chamfer that guides and drives the titanium welding wire (16) and zirconium welding wire (17).

7. The welding protection device for zirconium-titanium composite welded pipes as described in claim 6, characterized in that: The outer ends of the two wire-threading tubes (154) are respectively fitted with titanium wire wheels (156) and zirconium wire wheels (157) through bearing seats, and are wound with titanium welding wire (16) and zirconium welding wire (17). A tightening groove is provided in the bearing seat, and a tightening head (18) is threaded in the tightening groove to abut against the titanium wire wheel (156) and zirconium wire wheel (157).

8. The welding protection device for zirconium-titanium composite welded pipes as described in claim 1, characterized in that: The feeding assembly also includes an auxiliary feeding disk (193) driven on the outside of the titanium welding wire (16) and the zirconium welding wire (17), and is distributed in an axisymmetric state with the main feeding disk (192) on the servo motor (191); The main feed plate (192) and the auxiliary feed plate (193) are provided with friction grooves (198) on their circumferences for meshing and transmission with the titanium welding wire (16) and the zirconium welding wire (17).

9. The welding protection device for zirconium-titanium composite welded pipes as described in claim 8, characterized in that: The auxiliary feeding disc (193) is fitted with a ratchet (194) through a concentric shaft, and the ratchet (194) is fitted with a pawl (195) that is hinged to the wire threading tube (154). A compression spring (196) that is inclinedly fixed to the outside of the pawl (195) is fixed to the wire threading tube (154). A knob (197) is fixed to the outside of the pawl (195) by a lever, and an anti-slip groove is provided on the circumference of the knob (197).

10. The welding protection device for zirconium-titanium composite welded pipes as described in claim 6, characterized in that: Both sides of the two wire-threading tubes (154) are equipped with through-beam photoelectric sensors (199), which penetrate into the wire-threading cavity (155) and are symmetrically located on the outside of the titanium welding wire (16) and the zirconium welding wire (17). The welding machine housing (1) is equipped with an industrial camera (20) for monitoring the welding of the argon arc welding gun (14), titanium welding wire (16) and zirconium welding wire (17).

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