Drainage system suitable for filler wires using multiple shielding gases for local dry underwater laser welding.

Abstract

The present invention provides a drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, comprising an adjustable straight pipe, a connecting module, a drainage cover, a nozzle, and a wire feed pipe, wherein the connecting module is provided with a welding shielding gas supply hole, and the connecting module, the adjustable straight pipe, and the nozzle are connected from top to bottom and together form a long straight passage, the welding shielding gas supply hole is in communication with the long straight passage, the drainage cover is provided on the outside of the adjustable straight pipe and forms a drainage chamber that opens downward, the drainage cover is provided with a drainage gas supply hole that communicates with the drainage chamber, a fixed passage is provided on one side of the drainage cover, the wire feed pipe is inserted into the drainage chamber from the fixed passage, a third gap is formed between the inner wall of the fixed passage and the outside of the wire feed pipe, a welding wire shielding gas supply hole is provided in the wall of the fixed passage, and the welding wire shielding gas supply hole is in communication with the drainage chamber through the third gap. This drainage system meets the demand for underwater laser welding with filler wires, and can effectively improve the quality of filler wire welding by innovatively using welding wire shielding gas to ensure the welding wire remains dry.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater welding, and more specifically, to a drainage device suitable for a filler wire using a plurality of shielding gases for local dry underwater laser welding.

Background Art

[0002] Marine equipment is not only an important facility for supporting the marine economy, exploring the marine environment, and developing marine resources, but also an important driving force for promoting the overall progress of science and technology and the innovative development of engineering applications. Marine equipment is exposed to a large load, high intensity, and extremely harsh environment during operation and is affected by uncertain factors such as wind, waves, and earthquakes. Therefore, its important structures are prone to damage and may cause serious hazards.

[0003] The underwater welding repair technology is often used for the repair of marine structures. The underwater laser welding technology has become the focus of research because it has the advantages of small influence of water pressure, high energy density, and high control accuracy, and is an ideal method for underwater welding repair work. However, the existing drainage devices for underwater laser welding have the following problems.

[0004] (1) The welding quality with a filler wire is poor. The existing drainage devices for local dry underwater laser welding do not consider the need for welding with a filler wire during design. When welding without using a filler wire, a relatively good effect can be obtained. However, when performing underwater welding while feeding a filler wire using an external wire feeding device, high welding quality cannot be obtained. One of the reasons for the poor welding quality is that the welding wire contacts water, and water also infiltrates into the contact position between the welding wire and the drainage device. The infiltration of water increases the temperature gradient of the molten pool, resulting in a decrease in welding quality. On the other hand, due to the insufficient compatibility between the external wire feeding device and the drainage device, the protruding length of the welding wire is large and the welding wire is unstable.

[0005] (ii) Laser welding with filler wire requires the welding wire to be in contact with the laser spot; otherwise, welding with filler wire cannot be performed effectively. When an external wire feeder is used, the protrusion length becomes large, making it difficult to effectively ensure stable contact between the welding wire and the laser spot. This necessitates frequent adjustments during welding operations, reducing the production efficiency of welding.

[0006] (iii) In actual welding processes, damage to the protective lens of the laser welding head is unavoidable, and with existing drainage systems, the process of replacing the protective lens is complex and time-consuming, which has a significant impact on welding efficiency.

[0007] Therefore, local dry underwater laser welding processes require a drainage system suitable for underwater welding with filler wires, which can achieve good welding quality. [Overview of the project] [Problems that the invention aims to solve]

[0008] To overcome the shortcomings and defects of conventional technology, the object of the present invention is to provide a drainage device suitable for filler wires that uses multiple shielding gases for local dry underwater laser welding, which not only enables precise welding with filler wires but also innovatively protects the welding wire using shielding gases, ensures the welding wire is dry, and effectively improves the quality of welding with filler wires. [Means for solving the problem]

[0009] To achieve the above objective, the present invention is realized by the following technical means: A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, Equipped with adjustable straight pipes, connecting modules, drainage covers, nozzles and wire feed pipes, The connecting module is connected to a laser welding apparatus, and the connecting module is provided with a welding shielding gas supply port for connection to a welding shielding gas supply device. The connecting module, an adjustable straight pipe, and a nozzle are coaxially connected from top to bottom so that laser light from the laser welding apparatus can pass through, and together they form a long straight passage. The welding shielding gas supply port is connected to the long straight passage so that welding shielding gas is supplied from the welding shielding gas supply port, passes through the long straight passage, and is discharged from the nozzle ejection port. The drain cover is provided on the outside of the adjustable straight pipe and extends downward to a position lower than the bottom of the nozzle, thereby forming a drain chamber that opens downward, and the drain cover is provided with a drain gas supply hole for connection to a drain gas supply device, and the drain gas supply hole communicates with the drain chamber. A fixed passage is provided on one side of the drain cover, and the wire supply pipe is inserted into the drain chamber from the fixed passage. A third gap is formed between the inner wall of the fixed passage and the outside of the wire supply pipe. A welding wire shield gas supply hole is provided in the wall of the fixed passage for connection to a welding wire shield gas supply device. The welding wire shield gas supply hole communicates with the drain chamber through the third gap, so that welding wire shield gas is supplied from the welding wire shield gas supply hole, enters the drain chamber through the third gap, and protects the welding wire.

[0010] Preferably, the wire supply pipe does not come into contact with the nozzle, the extension of the central axis of the wire supply pipe intersects with the extension of the central axis of the long straight passage, and the intersection point is lower than the position of the bottom of the drain cover.

[0011] Preferably, the angle between the extension of the central axis of the wire feeding pipe and the extension of the central axis of the long straight passage is in the range of 25 to 35°.

[0012] Preferably, a boss is provided on the outside of the drain cover, and the drain gas supply hole is provided on the boss. The drain gas supply hole is in contact with the cross section of the circumferential inner wall of the drain cover and is inclined downward at an angle to the horizontal, so that the drain gas forms a downward swirling flow after entering the drain chamber.

[0013] Preferably, a second annular microgap is formed between the drain cover and the outer wall of the adjustable straight pipe.

[0014] Preferably, the connecting module is provided with a lens mounting groove, a lens pressing frame is detachably inserted into the lens mounting groove, a stepped ring is provided on the lens pressing frame, a protective lens is press-fitted into the stepped ring, and the fitting portion between the protective lens and the stepped ring is sealed by a rubber seal ring.

[0015] Preferably, the connecting module is provided with a flow straightening chamber, the welding shielding gas supply hole is provided in the side wall of the flow straightening chamber, a flow straightening ring is provided inside the flow straightening chamber, a first annular minute gap is formed between the outer wall of the flow straightening ring and the side wall of the flow straightening chamber, the flow straightening ring is provided with an internal hole in the flow straightening ring, and an adjustable straight pipe is provided with a pipe hole. The rectifier ring's inner bore, tube bore, and nozzle ejection hole are connected from top to bottom to form a long straight passage through which laser light from the laser welding apparatus can pass. The welding shielding gas is supplied from the welding shielding gas supply hole, rectified into a uniform annular high-pressure shielding gas through the first annular minute gap, and then enters the long straight passage formed by the rectifier ring's inner bore, tube bore, and nozzle ejection hole from the space above the rectifier ring before being discharged from the nozzle ejection hole.

[0016] Preferably, the range of the first annular microgap is 2% to 5% of the inner diameter of the rectifying chamber.

[0017] Preferably, the adjustable straight pipe includes an upper threaded pipe and a lower threaded pipe, the upper threaded pipe and the lower threaded pipe being screwed together, and the distance between the lens and nozzle of the laser welding apparatus is adjusted by adjusting the screw length between the upper threaded pipe and the lower threaded pipe, the screw length between the upper threaded pipe and the lower threaded pipe is locked by a screw locking ring, and a drain cover is provided on the outside of the lower threaded pipe.

[0018] Preferably, a connecting convex ring is provided on the upper part of the connecting module, the connecting convex ring is provided with a groove for attaching a first seal ring, the drain cover and the lower threaded pipe are connected by a bolt, and a second seal ring is provided between the drain cover and the lower threaded pipe for sealing.

[0019] When applying the above drainage system, the welding procedure is as follows:

[0020] First, the drainage device is adjusted to the welding position, and the bottom of the drainage cover is held 3-5 mm (determined according to the weld bead height) so that it does not directly contact the workpiece. The welding direction is the direction in which the laser spot is directed toward the welding wire; that is, when welding, the welding wire is in front and the laser spot is behind. The optimal relative position between the welding wire and the laser spot is when the welding wire is directed toward the outer circumference of the laser spot but does not contact the workpiece, and the welding wire is held 1 mm away from the workpiece.

[0021] Next, welding shielding gas is introduced through the welding shielding gas supply port, passes through the space above the straightening ring, first cleaning the protective lens, and then discharged along the optical path through the inner hole of the straightening ring, the upper threaded tube hole, the lower threaded tube hole, and the nozzle ejection port, forming a drainage effect. Subsequently, welding wire shielding gas is introduced through the welding wire shielding gas supply port, first forming a shielding effect on the welding wire. Finally, drainage gas is introduced, which removes water from the drainage chamber and stabilizes the drying space.

[0022] Subsequently, the laser beam is turned on, and approximately 0.1 seconds after the laser beam is turned on, the wire is fed into the molten pool. The drainage device is then moved in sync with the wire feeding, and the welding operation is performed.

[0023] Finally, once welding is complete, the wire feed is stopped, the laser beam is turned off, the drainage equipment is moved out of the water, and the drainage gas, welding wire shielding gas, and welding shielding gas are shut off in that order.

[0024] The air pressure of the welding shielding gas is slightly higher than the air pressure of the exhaust gas and the air pressure of the welding wire shielding gas, preventing the reverse flow of the gas from causing water droplets and welding spatter to damage the lens of the laser welding apparatus.

Advantages of the Invention

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects. 1. The drainage device of the present invention can guide the welding wire into the drainage chamber, meet the demand for welding with the filler wire, and innovatively uses the welding wire shielding gas. During underwater welding, the welding wire may be in a wet state, and the wet welding wire reduces the heat input of the welding and affects the welding efficiency. When the laser light evaporates the liquid attached to the welding wire, water vapor is also generated, causing blowholes in the weld bead and reducing the quality of the welding. The present invention forms an annular air flow after guiding the welding wire shielding gas, keeps the welding wire in a dry state, prevents the temperature difference between the welding wire and the workpiece from being too large and affecting the welding quality, and can effectively improve the quality of welding with the filler wire. 2. The exhaust gas of the drainage device of the present invention is innovatively blown downward along the inner wall of the drainage cover to form a downward swirling flow. The exhaust gas is expanded outward along the axis under the action of centrifugal force to remove water and form a stable dry space. 3. Based on the problem that the damage of the protective lens cannot be avoided during the actual laser welding process, the present invention designs a rapid replacement structure for the protective lens, which can greatly improve the efficiency of the welding operation. 4. The drainage device of the present invention drains water using three gas paths. The welding shield gas enters from the welding shield gas supply hole, first cleans the protective lens via the upper space of the rectifying ring, and then is discharged through the inner hole of the rectifying ring, the adjustable straight pipe hole, and the nozzle ejection hole along the optical path. The drainage gas enters from the drainage gas supply hole and is discharged through the drainage chamber. The welding wire shield gas enters from the welding wire shield gas supply hole, enters the drainage chamber via the third gap between the wire feeding pipe and the inner wall of its fixed passage, and is finally discharged. The installation of the three gas paths effectively forms a locally completely dry environment suitable for laser welding with a filler wire. 5. The gas path designed for the drainage device of the present invention is very narrow, and a low attenuation air pressure can be obtained, which is beneficial to the stability of the gas flow, prevents the welding spatter from entering the gas path, and the drainage gas entering the drainage device flows in a spiral shape, expands outward along the axis under the action of centrifugal force, and forms a more stable drainage effect.

Brief Description of the Drawings

[0026] [Figure 1] It is a schematic structural diagram of a drainage device suitable for a filler wire using multiple shield gases for local dry underwater laser welding according to the present invention. [Figure 2] It is an exploded view of a drainage device suitable for a filler wire using multiple shield gases for local dry underwater laser welding according to the present invention. [Figure 3] It is a schematic diagram of the welding shield gas path of a drainage device suitable for a filler wire using multiple shield gases for small local dry underwater laser welding according to the present invention. [Figure 4] It is a schematic diagram 1 of the drainage gas path of a drainage device suitable for a filler wire using multiple shield gases for small local dry underwater laser welding according to the present invention. [Figure 5] It is a schematic diagram 2 of the drainage gas path of a drainage device suitable for a filler wire using multiple shield gases for small local dry underwater laser welding according to the present invention. [Figure 6]This is a schematic diagram of the welding wire shielding gas path for a drainage device suitable for filler wires, using multiple shielding gases for small local dry underwater laser welding according to the present invention. [Figure 7(a)] This is a comparative diagram of gas streamline simulations for multiple methods of injecting wastewater gas. [Figure 7(b)] This is a comparative diagram of gas streamline simulations for multiple methods of injecting wastewater gas. [Figure 7(c)] This is a comparative diagram of gas streamline simulations for multiple methods of injecting wastewater gas. [Modes for carrying out the invention]

[0027] The present invention will be described in detail below with reference to the drawings, with reference to specific embodiments.

[0028] (Examples) As shown in Figures 1 to 6, the drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding according to this embodiment comprises an adjustable straight pipe, a connecting module 1, a drainage cover 9, a nozzle 8, and a wire feeding pipe 11. The adjustable straight pipe includes an upper threaded pipe 5 and a lower threaded pipe 7.

[0029] The connecting module 1 is connected to a laser welding device, and a connecting convex ring is provided on the upper part of the connecting module 1, and a recessed groove is provided on the connecting convex ring for attaching a first seal ring. The connecting module 1 is provided with a lens mounting groove, and a lens pressing frame 2 is detachably inserted into the lens mounting groove, and a stepped ring is provided on the lens pressing frame 2, and a protective lens is press-fitted into the stepped ring, and the mating portion between the protective lens and the stepped ring is sealed by a rubber seal ring. Two screw holes are provided on the outside of the lens pressing frame 2, and it is fixed to the lens mounting groove by two bolts, and the lens pressing frame 2 is removed from the lens mounting groove by bolts.

[0030] The connecting module 1 is provided with a flow straightening chamber, a welding shielding gas supply hole 3 is provided in the side wall of the flow straightening chamber, a flow straightening ring 4 is provided inside the flow straightening chamber, a first annular minute gap is formed between the outer wall of the flow straightening ring 4 and the side wall of the flow straightening chamber, and the range of the first annular minute gap is 2% to 5% of the inner diameter of the flow straightening chamber. The flow straightening ring 4 is provided with an inner hole in the flow straightening ring, and the first annular minute gap can supply the filled shielding gas to the inner hole in the flow straightening ring after straightening it into a uniform annular high-pressure shielding gas. The connecting module 1 is provided with a welding shielding gas supply hole 3 for connecting to a welding shielding gas supply device.

[0031] An upper threaded pipe 5 and a lower threaded pipe 7 are screwed together, and the distance between the lens and nozzle 8 of the laser welding device is adjusted by adjusting the screw length between the upper threaded pipe 5 and the lower threaded pipe 7. The screw length between the upper threaded pipe 5 and the lower threaded pipe 7 is locked by a screw lock ring 6, and the drain cover 9 is provided on the outside of the lower threaded pipe 7. Preferably, a screw pipe rubber seal ring groove is provided at the tip of the lower threaded pipe 7, and the screw pipe rubber seal ring is used to prevent air leakage and water ingress. The adjustable straight pipe is provided with a pipe hole consisting of an upper threaded pipe hole and a lower threaded pipe hole.

[0032] The connecting module 1, upper threaded pipe 5, lower threaded pipe 7, and nozzle 8 are coaxially connected from top to bottom. The inner hole of the rectifier ring, the upper threaded pipe hole, the lower threaded pipe hole, and the nozzle ejection hole are connected from top to bottom to form a long straight passage through which the laser beam from the laser welding apparatus can pass. The welding shielding gas is supplied from the welding shielding gas supply hole 3, rectified into a uniform annular high-pressure shielding gas through the first annular minute gap, and then enters the long straight passage formed by the inner hole of the rectifier ring, the upper threaded pipe hole, the lower threaded pipe hole, and the nozzle 8 ejection hole from the space above the rectifier ring 4, and is discharged from the nozzle 8 ejection hole.

[0033] The drain cover 9 is located on the outside of the adjustable straight pipe, specifically on the outside of the lower threaded pipe 7, and extends downward to a position lower than the bottom of the nozzle 8, forming a drain chamber that opens downward. The drain cover 9 is provided with a drain gas supply hole 10 for connection to a drain gas supply device, and the drain gas supply hole 10 communicates with the drain chamber. The drain cover 9 and the lower threaded pipe 7 are connected by bolts, and a second sealing ring is provided between the drain cover 9 and the lower threaded pipe 7 for sealing.

[0034] A boss is provided on the outside of the drain cover 9, and a drain gas supply hole 10 is provided on the boss. Preferably, the drain gas supply hole 10 is provided with a female thread to facilitate connection with the air supply piping. The drain gas supply hole 10 is in contact with the cross-section of the circumferential inner wall of the drain cover 9 and is inclined downward at an angle to the horizontal, so that the drain gas forms a downward swirling flow after entering the drain chamber. A second annular microgap is formed between the drain cover 9 and the outer wall of the lower threaded pipe 7. The drain gas enters through the drain gas supply hole 10 and enters the drain chamber through the second annular microgap.

[0035] The nozzle 8 is connected to the lower threaded pipe 7 by an internal thread. The nozzle 8 is made of copper, which has excellent heat dissipation properties. The nozzle 8 is wider at the top and narrower at the bottom, and has a constant length in the axial direction. This constant length and narrow flow path help stabilize the shielding gas.

[0036] The minimum diameter of nozzle 8 needs to be slightly larger than the laser spot size at the nozzle port when the limit defocusing amount is reached. Reducing the nozzle port size is advantageous in reducing the probability of welding spatter entering the optical path, but if the nozzle port size is too small, the nozzle temperature may become excessively high, potentially causing damage.

[0037] A fixed passage is provided on one side of the drain cover 9, and the wire supply pipe 11 is inserted into the drain chamber from the fixed passage and fixed by being screwed into the fixed passage. A third gap is formed between the inner wall of the fixed passage and the outside of the wire supply pipe 11, and a welding wire shield gas supply hole 12 for connection to a welding wire shield gas supply device is provided in the wall of the fixed passage, and the welding wire shield gas supply hole is connected to the drain chamber through the third gap, so that welding wire shield gas is supplied from the welding wire shield gas supply hole 12, enters the drain chamber through the third gap and protects the welding wire.

[0038] The wire supply pipe 11 does not come into contact with the nozzle 8, and the extension of the central axis of the wire supply pipe 11 intersects with the extension of the central axis of the long straight passage, with the intersection point being lower than the bottom of the drain cover 9.

[0039] The angle between the extension of the central axis of the wire feed pipe 11 and the extension of the central axis of the long straight passage is in the range of 25 to 35°.

[0040] Figures 7(a) to 7(c) are comparative simulation diagrams of gas streamlines for multiple drainage gas injection methods. Figure 7(a) shows the gas streamlines in a conventional drainage gas injection method, revealing that the flow becomes relatively turbulent after the drainage gas is injected, resulting in a high degree of turbulence. This unstable flow seriously impacts the drainage effect, and simultaneously, the turbulence of the drainage gas also affects the stability of the molten pool, increasing problems such as welding spatter and welding blowholes. Figure 7(b) shows that the drainage gas is injected along the tangential direction of the inner wall of the drainage cover, forming a swirling flow after injection, with slight turbulence only near the outlet of the drainage cover. Figure 7(c) shows the drainage gas injection method adopted in the present invention, where the drainage gas is injected downward at a constant angle to the horizontal along the tangential direction of the inner wall of the drainage cover. This injection method allows the drainage gas to form a stable swirling flow, and simulation results show that no turbulence occurs.

[0041] When applying the above drainage system, the welding procedure is as follows:

[0042] First, the drainage device is adjusted to the welding position, and the bottom of the drainage cover 9 is held 3-5 mm (determined according to the weld bead height) so that it does not directly contact the workpiece. The welding direction is the direction in which the laser spot is directed toward the welding wire, that is, when welding, the welding wire is in front and the laser spot is behind. The optimal relative position of the welding wire and the laser spot is when the welding wire is directed toward the outer circumference of the laser spot but does not contact the workpiece, and the welding wire is held 1 mm away from the workpiece.

[0043] Next, welding shielding gas is introduced through the welding shielding gas supply hole 3, passes through the space above the rectifier ring 4, first cleaning the protective lens, and then discharged along the optical path through the inner hole of the rectifier ring, the upper threaded tube hole, the lower threaded tube hole, and the nozzle ejection hole, forming a drainage effect. Subsequently, welding wire shielding gas is introduced through the welding wire shielding gas supply hole 12, first forming a shielding effect on the welding wire. Finally, drainage gas is introduced, which removes water from the drainage chamber and stabilizes the drying space.

[0044] Subsequently, the laser beam is turned on, and approximately 0.1 seconds after the laser beam is turned on, the wire is fed into the molten pool, and the drainage device is moved in sync with the wire feeding to perform the welding operation.

[0045] Finally, when welding is complete, stop feeding the wire, turn off the laser beam, move the drainage equipment out of the water, and shut off the drainage gas, welding wire shielding gas, and welding shielding gas in that order.

[0046] The air pressure of the welding shielding gas is slightly higher than that of the drainage gas and the welding wire shielding gas to prevent gas backflow from causing water droplets or welding spatter that could damage the lens of the laser welding equipment.

[0047] The drainage device of the present invention can effectively drain water in deep water environments, and produces high-quality weld beads through filler wire welding.

[0048] While the above embodiments represent preferred embodiments of the present invention, embodiments of the present invention are not limited to these embodiments, and any other modifications, alterations, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should all be included within the scope of protection of the present invention as equivalent substitutions.

[0049] (Note) (Note 1) A drainage system suitable for filler wires, using multiple shielding gases for local dry underwater laser welding, Equipped with adjustable straight pipes, connecting modules, drainage covers, nozzles and wire feed pipes, The connecting module is connected to a laser welding apparatus, and the connecting module is provided with a welding shielding gas supply port for connection to a welding shielding gas supply device. The connecting module, an adjustable straight pipe, and a nozzle are coaxially connected from top to bottom so that laser light from the laser welding apparatus can pass through, and together they form a long straight passage. The welding shielding gas supply port is connected to the long straight passage so that welding shielding gas is supplied from the welding shielding gas supply port, passes through the long straight passage, and is discharged from the nozzle ejection port. The drain cover is provided on the outside of the adjustable straight pipe and extends downward to a position lower than the bottom of the nozzle, thereby forming a drain chamber that opens downward, and the drain cover is provided with a drain gas supply hole for connection to a drain gas supply device, and the drain gas supply hole communicates with the drain chamber. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, characterized in that a fixed passage is provided on one side of the drainage cover, the wire supply pipe is inserted from the fixed passage into the drainage chamber, a third gap is formed between the inner wall of the fixed passage and the outside of the wire supply pipe, a welding wire shielding gas supply hole for connection to a welding wire shielding gas supply device is provided in the wall of the fixed passage, the welding wire shielding gas is supplied from the welding wire shielding gas supply hole and enters the drainage chamber via the third gap to protect the welding wire.

[0050] (Note 2) A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding as described in Appendix 1, characterized in that the wire feeding pipe does not come into contact with the nozzle, the extension of the central axis of the wire feeding pipe intersects with the extension of the central axis of a long straight passage, and the intersection point is lower than the position of the bottom of the drainage cover.

[0051] (Note 3) A drainage device suitable for filler wires, using multiple shielding gases for local dry underwater laser welding as described in Appendix 2, characterized in that the angle between the extension of the central axis of the wire feeding pipe and the extension of the central axis of the long straight passage is in the range of 25 to 35°.

[0052] (Note 4) A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding as described in Appendix 1, characterized in that a boss is provided on the outside of the drainage cover, the drainage gas supply hole is provided on the boss, the drainage gas supply hole is in contact with the cross section of the circumferential inner wall of the drainage cover and is inclined downward at an angle with the horizontal, so that the drainage gas forms a downward swirling flow after entering the drainage chamber.

[0053] (Note 5) A drainage device suitable for filler wires, using multiple shielding gases for local dry underwater laser welding as described in Appendix 4, characterized in that a second annular minute gap is formed between the drainage cover and the outer wall of an adjustable straight pipe.

[0054] (Note 6) A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in Appendix 1, characterized in that the connecting module is provided with a lens mounting groove, a lens pressing frame is detachably inserted into the lens mounting groove, a stepped ring is provided on the lens pressing frame, a protective lens is press-fitted into the stepped ring, and the fitting portion between the protective lens and the stepped ring is sealed by a rubber seal ring.

[0055] (Note 7) The connecting module is provided with a flow straightening chamber, the welding shielding gas supply hole is provided in the side wall of the flow straightening chamber, a flow straightening ring is provided inside the flow straightening chamber, a first annular minute gap is formed between the outer wall of the flow straightening ring and the side wall of the flow straightening chamber, the flow straightening ring is provided with an internal hole in the flow straightening ring, and an adjustable straight pipe is provided with a pipe hole. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in Appendix 1, characterized in that the inner bore of the straightening ring, the tube bore and the nozzle ejection hole are connected in a long straight passage from top to bottom so that laser light from the laser welding apparatus can pass through, and the welding shielding gas is supplied from the welding shielding gas supply hole, straightened into a uniform annular high-pressure shielding gas through a first annular minute gap, enters the long straight passage formed by the inner bore of the straightening ring, the tube bore and the nozzle ejection hole from the space above the straightening ring, and is discharged from the nozzle ejection hole.

[0056] (Note 8) A drainage device suitable for filler wires, using multiple shielding gases for local dry underwater laser welding as described in Appendix 7, characterized in that the range of the first annular minute gap is 2% to 5% of the inner diameter of the rectifying chamber.

[0057] (Note 9) A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in Appendix 1, characterized in that the adjustable straight pipe includes an upper threaded pipe and a lower threaded pipe, the upper threaded pipe and the lower threaded pipe are screwed together, the distance between the lens and nozzle of the laser welding device is adjusted by adjusting the screw length between the upper threaded pipe and the lower threaded pipe, the screw length between the upper threaded pipe and the lower threaded pipe is locked by a screw locking ring, and the drainage cover is provided on the outside of the lower threaded pipe.

[0058] (Note 10) A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in Appendix 9, characterized in that a connecting convex ring is provided on the upper part of the connecting module, a recess for attaching a first seal ring is provided on the connecting convex ring, the drainage cover and the lower threaded pipe are connected by bolts, and a second seal ring is provided between the drainage cover and the lower threaded pipe for sealing. [Explanation of symbols]

[0059] 1 Linking Module 2. Lens pressing frame 3. Welding shielding gas supply hole 4. Rectifier ring 5. Top threaded pipe 6. Screw lock ring 7. Lower threaded pipe 8 nozzles 9. Drain cover 10 Drainage gas supply hole 11 Wire feed pipe 12 Welding wire shielding gas supply holes

Claims

1. A drainage system suitable for filler wires, using multiple shielding gases for local dry underwater laser welding, Equipped with adjustable straight pipes, connecting modules, drainage covers, nozzles and wire feed pipes, The connecting module is connected to a laser welding apparatus, and the connecting module is provided with a welding shielding gas supply port for connection to a welding shielding gas supply device. The connecting module, an adjustable straight pipe, and a nozzle are coaxially connected from top to bottom so that laser light from the laser welding apparatus can pass through, and together they form a long straight passage. The welding shielding gas supply port is connected to the long straight passage so that welding shielding gas is supplied from the welding shielding gas supply port, passes through the long straight passage, and is discharged from the nozzle ejection port. The drain cover is provided on the outside of the adjustable straight pipe and extends downward to a position lower than the bottom of the nozzle, thereby forming a drain chamber that opens downward, and the drain cover is provided with a drain gas supply hole for connection to a drain gas supply device, and the drain gas supply hole communicates with the drain chamber. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, characterized in that a fixed passage is provided on one side of the drainage cover, the wire supply pipe is inserted from the fixed passage into the drainage chamber, a third gap is formed between the inner wall of the fixed passage and the outside of the wire supply pipe, a welding wire shielding gas supply hole for connection to a welding wire shielding gas supply device is provided in the wall of the fixed passage, the welding wire shielding gas is supplied from the welding wire shielding gas supply hole and enters the drainage chamber via the third gap to protect the welding wire.

2. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 1, characterized in that the wire feeding pipe does not come into contact with the nozzle, the extension of the central axis of the wire feeding pipe intersects with the extension of the central axis of a long straight passage, and the intersection point is lower than the position of the bottom of the drainage cover.

3. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 2, characterized in that the angle between the extension of the central axis of the wire feeding pipe and the extension of the central axis of the long straight passage is in the range of 25 to 35°.

4. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, characterized in that a boss is provided on the outside of the drainage cover, the drainage gas supply hole is provided on the boss, the drainage gas supply hole is in contact with the cross section of the circumferential inner wall of the drainage cover and is inclined downward at an angle with the horizontal direction, so that the drainage gas forms a downward swirling flow after entering the drainage chamber, as described in claim 1.

5. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 4, characterized in that a second annular minute gap is formed between the drainage cover and the outer wall of an adjustable straight pipe.

6. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 1, characterized in that the connecting module is provided with a lens mounting groove, a lens pressing frame is detachably inserted into the lens mounting groove, a stepped ring is provided on the lens pressing frame, a protective lens is press-fitted into the stepped ring, and the fitting portion between the protective lens and the stepped ring is sealed by a rubber seal ring.

7. The connecting module is provided with a flow straightening chamber, the welding shielding gas supply hole is provided in the side wall of the flow straightening chamber, a flow straightening ring is provided inside the flow straightening chamber, a first annular minute gap is formed between the outer wall of the flow straightening ring and the side wall of the flow straightening chamber, the flow straightening ring is provided with an internal hole, and the adjustable straight pipe is provided with a pipe hole. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 1, characterized in that the inner bore of the straightening ring, the tube bore and the nozzle ejection hole are connected in a long straight passage from top to bottom so that laser light from the laser welding apparatus can pass through, and the welding shielding gas is supplied from the welding shielding gas supply hole, straightened into a uniform annular high-pressure shielding gas through a first annular minute gap, enters the long straight passage formed by the inner bore of the straightening ring, the tube bore and the nozzle ejection hole from the space above the straightening ring, and is discharged from the nozzle ejection hole.

8. A drainage device suitable for filler wires, using multiple shielding gases for local dry underwater laser welding according to claim 7, characterized in that the range of the first annular minute gap is 2% to 5% of the inner diameter of the rectifying chamber.

9. The adjustable straight pipe includes an upper threaded pipe and a lower threaded pipe, the upper threaded pipe and the lower threaded pipe are screwed together, the distance between the lens and nozzle of the laser welding apparatus is adjusted by adjusting the screw length between the upper threaded pipe and the lower threaded pipe, the screw length between the upper threaded pipe and the lower threaded pipe is locked by a screw locking ring, and the drain cover is provided on the outside of the lower threaded pipe, characterized in that a drainage device suitable for filler wire using multiple shielding gases for local dry underwater laser welding according to claim 1.

10. A drainage device suitable for filler wires using multiple shielding gases for local dry underwater laser welding, as described in claim 9, characterized in that a connecting convex ring is provided on the upper part of the connecting module, a recessed groove for attaching a first seal ring is provided on the connecting convex ring, the drainage cover and the lower threaded pipe are connected by bolts, and a second seal ring for sealing is provided between the drainage cover and the lower threaded pipe.

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