Protection device for inner wall of nickel-based high-temperature-resistant molten salt alloy welding pipeline

Abstract

The utility model relates to a protection device for the inner wall of a nickel-based high-temperature-resistant molten salt alloy welding pipeline. The problems that in the prior art, when pipe fittings are welded, air holes are prone to occurring, and generated splashes are prone to being attached to the outer surface of a pipeline and difficult to clean are solved. The protection piece comprises a protection piece body, a conical groove allowing a welding pipe to penetrate is formed in the protection piece body, a gas protection assembly is arranged at one end of the protection piece body, a locking structure is arranged at the other end of the protection piece body, and cooling mechanisms close to the bottom of the conical groove are arranged on the two sides of the lower end of the protection piece body. The device has the advantages that splashing substances generated by pipe welding are effectively prevented from being attached to the inner wall of a pipeline, air holes of a welding seam are reduced, the welding seam is prevented from being oxidized, and the device can be effectively guaranteed to work continuously and normally for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to a protective device structure for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipeline. Background Art

[0002] Laser welding uses an optical system to focus the laser beam onto a very small area, creating a highly concentrated heat source area at the weld in a very short time, causing the weld to melt and recrystallize to form a strong weld point and weld. Before welding large pipe groups, the interior of the pipe needs to be filled with argon for protection. The current argon filling protection device has too low argon filling efficiency, resulting in a long filling process and high argon consumption, which is not conducive to the overall dose rate control of maintenance personnel. In addition, during the laser welding process, if the weld is not effectively protected, the gas at the weld can easily enter the molten pool and remain in the weld in the form of bubbles, forming pores. In addition, spatter is easily generated during the laser welding process. The spatter adheres to the outer surface of the pipe and can be cleaned by grinding the outer surface, but the spatter adheres to the inner wall of the pipe and becomes extremely difficult to clean manually or by other means as the pipe becomes longer.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document discloses an argon-filled protection device for pipeline welding [CN201910355704.3], which includes a gas distribution box with a first gas inlet and multiple first gas outlets; an inlet pipe connected to the first gas inlet for feeding argon gas from an argon gas cylinder into the gas distribution box; a gas hood with multiple circumferentially distributed second gas inlets, each of which is connected to a first gas outlet in a one-to-one correspondence; and a second gas outlet extending circumferentially along the outer wall of the gas hood. The gas hood can be positioned inside a pipeline, and the second gas outlet is used to cover the pipeline weld joint for argon protection.

[0004] The above solution solves to a certain extent the problem of low argon filling efficiency of the argon filling protection device during pipeline welding in the prior art, but the solution still has many shortcomings, such as: the gas at the welding point can easily enter the molten pool and form pores, and the spatter generated can easily adhere to the outer surface of the pipeline and be difficult to clean. Summary of the Invention

[0005] The purpose of the utility model is to solve the above problems and provide a protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipeline.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, comprising a protective part main body, a conical groove for the welding pipe to pass through, a gas protection assembly at one end of the protective part main body, a locking structure at the other end of the protective part main body, and cooling mechanisms close to the bottom of the conical groove on both sides of the lower end of the protective part main body.

[0007] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe, the cooling mechanism includes U-shaped grooves arranged on both sides of the bottom of the protective part body, and a cooling water pipe is arranged in the U-shaped groove. One end of the cooling water pipe is connected to the water inlet of the chiller and the other end is connected to the water outlet of the chiller.

[0008] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe, the cooling water pipe is bent in a U-shape at one end of the protective component body and forms a cooling circuit with the chiller.

[0009] In the above-mentioned protection device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, the gas protection component includes a rectangular groove arranged at one end of the protective part body, the upper end of the rectangular groove is closed and one end of the rectangular groove is connected to the conical groove, and an air guide tube is provided in the rectangular groove.

[0010] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, a channel for the welding pipe to pass through is provided on the inner side of the air guide pipe, and several air guide channels are provided on the inner side of the air guide pipe and on the outer side of the channel.

[0011] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, a support table for supporting the welding pipe is provided at the upper end of the conical groove, the air guide pipe extends toward the support table and the inlet and outlet of the air flow channel are arranged toward the support table.

[0012] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, the support table is arranged to be open and form a welding gap.

[0013] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe, an annular positioning channel for the ventilation copper pipe to penetrate is provided at one end of the protective member body away from the rectangular groove.

[0014] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe, the locking structure includes a threaded hole arranged at the bottom of the protective part body, and the threaded hole and the annular positioning channel are connected to each other through a positioning through hole.

[0015] In the above-mentioned protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe, an annular penetration hole is provided at one end of the rectangular groove and located on the end surface of the protective member body.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. It can effectively prevent the spatter produced by welding from adhering to the inner wall of the pipe;

[0018] 2. It can effectively protect the inner weld pool, reduce weld porosity, and prevent weld oxidation; it can also effectively prevent and suppress spatter, promote the uniform spreading of the weld pool during solidification, and make the weld shape uniform and beautiful;

[0019] 3. It can effectively ensure that the device can work normally continuously and for a long time, and greatly improve the weld formation, weld quality and protection of the inner wall of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a top view of the present utility model;

[0022] Figure 3 This is a schematic diagram of the main structure of the protective member in the utility model;

[0023] Figure 4 It is a schematic diagram of the end structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the airway structure in the utility model;

[0025] Figure 6 yes Figure 1 Cross-sectional view at LL;

[0026] Figure 7 yes Figure 1 Cross-sectional view at KK in the middle;

[0027] Figure 8 yes Figure 1 Cross-sectional view at GG in the middle;

[0028] In the figure: protective part body 1, annular positioning channel 11, conical groove 2, support table 21, gas protection component 3, rectangular groove 31, annular penetration hole 311, air guide tube 32, channel 321, air guide channel 322, locking structure 4, threaded hole 41, positioning through hole 42, cooling mechanism 5, U-shaped groove 51, cooling water pipe 52. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] like Figure 1-8As shown, a protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe includes a protective part main body 1, a tapered groove 2 for the welding pipe to pass through is provided on the protective part main body 1, a gas protection component 3 is provided at one end of the protective part main body 1, a locking structure 4 is provided at the other end of the protective part main body 1, and cooling mechanisms 5 close to the bottom of the tapered groove 2 are provided on both sides of the lower end of the protective part main body 1.

[0031] The cooling mechanism 5 includes a U-shaped groove 51 provided on both sides of the bottom of the protective member body 1 , a cooling water pipe 52 is provided in the U-shaped groove 51 , one end of the cooling water pipe 52 is connected to the water inlet of the chiller and the other end is connected to the water outlet of the chiller.

[0032] It can be seen that the cooling water pipe 52 is bent in a U-shape at one end of the protective element body 1 and forms a cooling circuit with the chiller.

[0033] The cooling water in the chiller is continuously circulated and cooled. Since the air knife block is very close to the laser welding area, the temperature in this area is relatively high and is easily affected by the laser welding, causing the air knife block to overheat. This is especially true for continuous welding of more than 10 hours. Cooling the circulating water can ensure that the air knife block is not affected by the external high temperature environment.

[0034] Obviously, the gas protection assembly 3 includes a rectangular groove 31 provided at one end of the protection member body 1 , the upper end of the rectangular groove 31 is closed and one end of the rectangular groove 31 is connected to the conical groove 2 , and an air guide tube 32 is provided in the rectangular groove 31 .

[0035] Furthermore, a channel 321 for the welding pipe to pass through is provided on the inner side of the air guide tube 32 , and a plurality of air guide channels 322 are provided on the inner side of the air guide tube 32 and on the outer side of the channel 321 .

[0036] Through the air guide channel 322, the shielding gas can be output to the conical groove 2 through external equipment, so that the shielding gas in this area can protect the weld surface oxidation and weld formation, thereby improving the surface protection effect of the workpiece, thereby effectively reducing the spatter and pores generated during the welding process, and protecting the weld and the inner wall of the workpiece from spatter adhesion.

[0037] Furthermore, a support table 21 for supporting the welding pipe is provided at the upper end of the tapered groove 2 , the air guide pipe 32 is extended toward the support table 21 , and the inlet and outlet of the air flow channel 321 are arranged toward the support table 21 .

[0038] The excess protective gas on the tapered groove 2 and the supporting table 21 can flow back through the gas guide channel 322, thereby achieving full utilization of the protective gas.

[0039] Specifically, the support table 21 is opened to form a welding gap.

[0040] More specifically, an annular positioning channel 11 for the ventilation copper pipe to pass through is provided at one end of the protection member body 1 away from the rectangular groove 31 .

[0041] In detail, the locking structure 4 includes a threaded hole 41 provided at the bottom of the protector body 1 , and the threaded hole 41 and the annular positioning channel 11 are communicated with each other via a positioning through hole 42 .

[0042] The locking structure 4 is mainly used to lock and position the ventilation copper pipe.

[0043] Preferably, an annular penetration hole 311 is provided at one end of the rectangular groove 31 and located on the end surface of the protective member body 1 .

[0044] The annular positioning channel 11 is connected to the vent copper tube. Inserting the copper tube into the annular positioning channel 11 enables conduction and the blowing of shielding gas. The pure shielding gas used depends primarily on the material of the workpiece being welded. Different materials require different shielding gases, typically nitrogen or argon. The operating pressure of this mixed gas is no less than 0.5 MPa, and the operating flow rate is approximately 25 L / min. The pure shielding gas entering the air knife block is combined into a single shielding gas chamber, thus protecting the entire laser welding process, effectively protecting the weld pool, reducing weld porosity, minimizing spatter during welding, and promoting even spreading of the weld pool during solidification, resulting in a uniform and beautiful weld.

[0045] To sum up, the principle of this embodiment is that: during welding, the ventilation copper tube is locked and positioned in the annular positioning channel 11 through the locking structure 4, and the protective gas is blown into the conical groove 2 and the support table 21 by the air guide tube 32 to protect the surface oxidation of the weld and the weld formation, thereby reducing the spatter generated during the welding process and protecting the weld and the inner wall of the workpiece from spatter adhesion. Secondly, air is blown through the ventilation copper tube to reflux the excess protective gas, and the cooling water pipe 52 is used for cooling to ensure that the air knife block is not affected by the external high temperature environment.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0047] Although this document frequently uses terms such as protective element body 1, annular positioning channel 11, tapered groove 2, support table 21, gas protection assembly 3, rectangular groove 31, annular penetration hole 311, air guide tube 32, channel 321, air guide channel 322, locking structure 4, threaded hole 41, positioning through hole 42, cooling mechanism 5, U-shaped groove 51, and cooling water pipe 52, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe, comprising a protective member body (1), characterized in that: The protective member body (1) is provided with a tapered groove (2) for the welding pipe to pass through, and a gas protection component (3) is provided at one end of the protective member body (1), and a locking structure (4) is provided at the other end of the protective member body (1). Cooling mechanisms (5) close to the bottom of the tapered groove (2) are provided on both sides of the lower end of the protective member body (1).

2. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welded pipe according to claim 1, characterized in that: The cooling mechanism (5) comprises U-shaped grooves (51) arranged on both sides of the bottom of the protective member body (1), a cooling water pipe (52) is arranged in the U-shaped groove (51), and one end of the cooling water pipe (52) is connected to the water inlet of the chiller and the other end is connected to the water outlet of the chiller.

3. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 2, characterized in that: The cooling water pipe (52) is bent in a U-shape at one end of the protective component body (1) and forms a cooling circuit with the chiller.

4. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 1, characterized in that: The gas protection assembly (3) comprises a rectangular groove (31) arranged at one end of the protection member body (1), the upper end of the rectangular groove (31) is closed and one end of the rectangular groove (31) is connected to the conical groove (2), and an air guide tube (32) is provided in the rectangular groove (31).

5. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 4, characterized in that: The air guide tube (32) is provided with a channel (321) on the inner side thereof for the welding tube to pass through, and a plurality of air guide channels (322) are provided on the inner side thereof and on the outer side thereof.

6. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 5, characterized in that: The upper end of the tapered groove (2) is provided with a support table (21) for supporting the welding pipe, the air guide pipe (32) is extended toward the support table (21), and the inlet and outlet of the air flow channel (321) are arranged toward the support table (21).

7. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 6, characterized in that: The support table (21) is arranged to be open and form a welding gap.

8. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 7, characterized in that: An annular positioning channel (11) for the ventilation copper pipe to pass through is provided at one end of the protective member body (1) away from the rectangular groove (31).

9. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 8, characterized in that: The locking structure (4) comprises a threaded hole (41) provided at the bottom of the protective member body (1); the threaded hole (41) and the annular positioning channel (11) are communicated with each other via a positioning through hole (42).

10. The protective device for the inner wall of a nickel-based high-temperature resistant molten salt alloy welding pipe according to claim 4, characterized in that: One end of the rectangular groove (31) is provided with an annular penetration hole (311) located on the end surface of the protective member body (1).

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