CN221306236U - Radiation detection protection tool for butt welding seam of heat exchange tube of steam generator - Google Patents

Abstract

The utility model discloses a radiation detection protection tool for butt welding seams of heat exchange tubes of a steam generator, which comprises a protection sealing box, wherein one end of the protection sealing box is provided with an arc-shaped groove which is matched with the outline dimension of a machine head of an X-ray machine; the other end of the protective sealing box is provided with a sealing end cover which is connected through a hinge and is provided with a quick locking buckle, and a hole with the diameter close to phi 19mm is formed in the boundary of the protective sealing box for installing and replacing the heat pipe; the upper end of the protective sealing box is provided with a quick-connection interface which can be positioned in one step when being matched and assembled with the machine head; the whole protective sealing box is made of stainless steel and is internally provided with a 2mm lead plate; the X-ray flaw detector head can be fixed at any weld joint through the protection tool, and the positioning is accurate; when the tool is used for detection, shielding measures are not required to be independently adopted for protection, so that the protection cost is reduced, the auxiliary time in the radiation detection process is reduced, and the detection efficiency is improved.

Description

Radiation detection protection tool for butt welding seam of heat exchange tube of steam generator

Technical Field

The utility model relates to a device for fixing an X-ray machine and a film in the radiation detection protection and detection process of butt welding seams of jungle type tube heat exchange tubes of a high-temperature gas cooled reactor, in particular to a radiation detection protection tool for butt welding seams of heat exchange tubes of a steam generator.

Background

The high-temperature gas cooled reactor steam generator is a nuclear power technology with the fourth generation characteristic of complete independent intellectual property rights, and has the characteristics of inherent safety characteristic, long design life, high working temperature, high manufacturing standard and technical requirement and the like. The key equipment steam generator is compared with the pressurized water reactor steam generator, completely different structural designs are adopted, a loop is high-temperature helium, a heat exchange component is of a 665 spiral coil structure, a complex heat insulation wrapping structure is arranged between the heat exchange component and the shell, a helium fan and a cooler are arranged in the equipment, and the helium fan and the cooler and the reactor pressure vessel are arranged side by side. The total height of the equipment is 25.3 meters, the maximum outer diameter is 4.1 meters, and the total weight is 495 tons. The heat exchange unit is about 10m long, the diameter is only half a meter, and the inside of the heat exchange unit is formed by unevenly and regularly distributing dozens of heat exchange pipes. The adjacent heat exchange tubes are compact in arrangement, the operation space is narrow, gaps between the adjacent heat exchange tubes are generally 50-100mm, and because the heat exchange units are vertically arranged, detection operation is required at the place of ten meters high altitude, an X-ray device is required to be fixed on the heat exchange tubes, a protection structure is arranged, meanwhile, focal length and geometric unclear meeting requirements are considered, the tension condition of the space between the heat exchange tubes is further aggravated, each heat exchange tube is required to be subjected to at least two-angle transillumination (two angles form 90 degrees), and the complex field condition enables a common portable X-ray flaw detector not to enter the heat exchange units and cannot contact the heat exchange tubes in the heat exchange units, so that the requirements of field use cannot be met, and the X-ray flaw detector is required to be detected by a specially developed high-frequency small-focus mobile X-ray flaw detector and a corresponding auxiliary protection device is required.

Because the size of the heat exchange tube is phi 19 multiplied by 3mm, the radiation detection is carried out on the heat exchange tube by adopting a double-wall double-image imaging technology. The current concrete detection implementation process is carried out in a fixed area with lead plates distributed around, the protection cost is high, meanwhile, operators need to withdraw from the station, the detection efficiency is low, the auxiliary time is long, the design protection tool is easy to think about the compact layout, and no mature product exists in the world and domestic until the present.

Based on the actual welding line detection requirement of the heat exchange tube of the steam generator, the detection efficiency is comprehensively considered, the operation space is narrow and complex, and other actual conditions, the inventor makes intensive researches on the detection process and detection auxiliary equipment so as to expect to design a novel butt welding line radiation detection protection tool for the heat exchange tube of the steam generator, which can solve the problems.

Disclosure of utility model

In order to overcome the problems, the inventor carries out intensive researches and designs a radiation detection protection tool for butt welding seams of heat exchange tubes of steam generators, the protection tool comprises a protection sealing box, the design width dimension of the protection sealing box is 60mm at the maximum, the direction of a ray bundle is in fan-shaped diffusion, the effective ray bundle is ensured to pass through the welding seams of the heat exchange tubes and is not shielded and simultaneously imaged on a negative film, and the width direction is parallel, so that the scattering influence of scattered rays is reduced; one end of the protective sealing box is provided with an arc-shaped notch which is matched with the outline dimension of the X-ray machine head to ensure that rays are not leaked; the other end of the protective sealing box is provided with a sealing end cover which is connected through a hinge and is provided with a quick locking buckle, and the formed boundary is provided with a sealing end cover with a diameter close to that of the protective sealing boxThe heat exchange tube can be fixed with the fixture clamp, and the hole is arranged eccentrically by 0.5mm, so that the clamp is firm and fully protected, and ray leakage is avoided; the upper end of the protective sealing box is provided with a quick-connection interface, so that the protective sealing box can be positioned in one step when being matched with a machine head to ensure the assembly precision and efficiency; the whole protective sealing box is made of stainless steel, a lead plate with the thickness of 2mm is arranged in the protective sealing box, and the splice joint of the lead plate is overlapped and covered by at least 10 mm; the X-ray flaw detector head can be fixed at any weld joint through the protection tool, positioning is accurate, and the exposure condition of each heat exchange tube is detected to be constant; when the tool is used for detection, shielding measures are not required to be independently adopted for protection, so that the protection cost is reduced, the auxiliary time in the radiation detection process is reduced, and the detection efficiency is improved, and the utility model is completed.

In particular, the utility model aims to provide a radiation detection protection tool for butt welding seams of heat exchange tubes of a steam generator, which comprises a hollow protection sealing box 1,

A sealing end cover 2 is arranged at one end of the protective sealing box 1, the protective tool is fixed on the heat exchange tube through the cooperation of the protective sealing box 1 and the sealing end cover 2, and the weld joint to be detected is positioned in the protective tool;

The other end of the protective sealing box 1 is provided with a notch 3 with an arc-shaped section; the shape and the size of the notch 3 are matched with those of the side part of the X-ray machine head 4, so that the X-ray machine head 4 can be embedded into the notch 3, and the protective sealing box 1 and the X-ray machine head 4 are tightly attached to each other;

A quick-connection interface 5 is arranged at the top of the protective sealing box 1; the quick connector 5 cooperates with a quick connector plug 41 on the X-ray machine head 4 for quick alignment and fixing of the X-ray machine head 4.

One side between the protective sealing box 1 and the sealing end cover 2 is rotatably connected through a hinge, and the other side is locked and fixed in an openable and closable way through a quick locking buckle.

Wherein, offer the through-hole 6 that supplies heat exchange tube 7 to pass through on the protection frock, just a part of through-hole 6 is located protection seal box 1, another part of through-hole 6 is located seal end cover 2.

Wherein, the inner dimension of the through hole 6 is basically consistent with the cross section dimension of the heat exchange tube 7, so that the heat exchange tube 7 can be clamped by the protective sealing box 1 and the sealing end cover 2, and the protective tooling is fixed on the heat exchange tube 7.

Wherein the through holes 6 are arranged eccentrically.

The lead plates 8 are arranged on the inner sides of the protective sealing box 1 and the sealing end cover 2, the lead plates 8 are overlapped and covered at the joint seam between the protective sealing box 1 and the sealing end cover 2, and the width of the overlapped and covered area is at least 10mm.

Wherein the notch 3 is arranged obliquely relative to the heat exchange tube 7, so that the X-ray machine head 4 arranged in the notch 3 is arranged obliquely relative to the heat exchange tube 7.

Wherein, the quick connection interface 5 is provided with a limit hole 51,

The quick connect plug 41 is provided with a positioning post 42,

The limiting hole 51 has an inner diameter that is identical to the outer diameter of the positioning post 42,

When the positioning column 42 is inserted into the limiting hole 51, the ray outlet window 43 on the X-ray machine head 4 is located inside the protective sealing box 1 and faces to the position where the welding seam is located.

Wherein, the positioning column 42 is automatically locked after being inserted into the limiting hole 51,

An unlocking button 52 is provided on the quick connector 5, and the locking of the positioning column 42 is released by pressing the unlocking button 52, so that the positioning column 42 is allowed to withdraw from the limiting hole 51.

The utility model has the beneficial effects that:

(1) According to the radiation detection protection tool and the detection method for the butt welding seam of the heat exchange tube of the steam generator, the arc-shaped groove is formed in the protection sealing box, and the arc-shaped groove is matched with the outline dimension of the head of the X-ray machine, so that the head of the X-ray machine can be quickly inserted and installed, and meanwhile, no radiation leakage is ensured;

(2) According to the radiation detection protection tool and the detection method for the butt welding seam of the heat exchange tube of the steam generator, the protection sealing box is connected with the sealing end cover through the hinge and is provided with the quick locking buckle, and the detection protection tool is fixed at the welding seam of the heat exchange tube through the through hole which is basically consistent with the outer diameter size of the heat exchange tube;

(3) According to the radiation detection protection tool and the radiation detection method for the butt welding seam of the heat exchange tube of the steam generator, provided by the utility model, the protection sealing box and the sealing end cover are provided with the semicircle for clamping and fixing the heat exchange tube, one semicircle is an eccentric semicircle, the eccentric distance is 0.5mm, and the hardness of the lead plate is far less than that of the heat exchange tube due to the lead plate arranged at the inner wall of the semicircle, so that the heat exchange tube can be ensured to be fixed without being scratched and radiation leakage is avoided;

(4) According to the radiation detection protection tool and the radiation detection method for the butt welding seam of the heat exchange tube of the steam generator, the upper end of the protection sealing box is provided with the quick-connection interface, so that the quick-connection interface can be positioned in one step when matched with the machine head of the X-ray machine for assembly, and the assembly precision and the assembly efficiency are improved;

(5) According to the tool and the method for detecting and protecting the butt weld of the heat exchange tube of the steam generator by the rays, when the tool and the method are used for detection, shielding measures are not required to be independently adopted for protection, so that the protection cost is reduced, the auxiliary time in the radiation detection process is reduced, and the detection efficiency is improved.

Drawings

Fig. 1 is a schematic diagram showing the overall structure of a steam generator heat exchange tube butt weld radiographic inspection protection tool when the tool is mounted on the heat exchange tube;

Fig. 2 shows a schematic structural diagram of a protective sealing box of a steam generator heat exchange tube butt welding seam ray detection protective tool and an X-ray machine head;

Fig. 3 shows a schematic structural diagram of a protective sealing box of a steam generator heat exchange tube butt weld ray detection protective tool;

FIG. 4 shows a schematic diagram of the structure of an X-ray machine head on a radiation detection protection tool for butt welding seams of heat exchange tubes of a steam generator;

Fig. 5 shows a schematic diagram of a sealing end cover structure of a radiation detection protection tool for butt welding seams of heat exchange tubes of a steam generator;

FIG. 6 is a schematic diagram showing a protective tooling arranged between a plurality of heat exchange tubes in an embodiment;

Fig. 7 shows a cross-sectional view of fig. 6.

Reference numerals

1-Protective seal box

2-Seal end cap

3-Notch

4-X ray machine head

41-Quick-connect plug

42-Location column

43-Ray exit window

5-Quick connect interface

51-Limiting hole

52-Unlocking button

6-Through hole

7-Heat exchange tube

8-Lead plate

Detailed Description

The utility model is further described in detail below by means of the figures and examples. The features and advantages of the present utility model will become more apparent from the description.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

According to the radiation detection protection tool for the butt weld of the heat exchange tube of the steam generator, as shown in fig. 1 and 2, the protection tool comprises a hollow protection sealing box 1, wherein the protection sealing box is a stainless steel box body, and the longitudinal section of the protection sealing box is trapezoidal, namely, the bottom of the protection sealing box is an inclined plane, so that radiation can irradiate the weld along the direction of the inclined plane; preferably, the design width dimension of the protective sealing box 1 is 60mm at most, the direction of the ray beam is in sector diffusion, and the imaging of the effective ray beam on the negative film is ensured while the effective ray beam passes through the welding line of the heat exchange tube and is not shielded.

A sealing end cover 2 is arranged at one end of the protective sealing box 1, the protective tool is fixed on the heat exchange tube through the cooperation of the protective sealing box 1 and the sealing end cover 2, and the weld joint to be detected is positioned in the protective tool; the protection sealing box 1 and the sealing end cover 2 can be fixed at any height position of the heat exchange tube, and the protection sealing box 1 and the sealing end cover 2 can face any direction, so that a plurality of welding lines and multi-intersection points are detected.

The other end of the protective sealing box 1 is provided with a notch 3 with an arc-shaped section; the shape and the size of the notch 3 are matched with those of the side part of the X-ray machine head 4, and the notch 3 is cylindrical, so that the X-ray machine head 4 can be embedded into the notch 3, and the protective sealing box 1 and the X-ray machine head 4 are tightly attached to each other, thereby ensuring the stability of the X-ray machine head 4 and placing the rays to overflow;

As shown in fig. 1 and 2, a quick-connect interface 5 is provided on top of the protective seal box 1; the quick connector 5 cooperates with a quick connector plug 41 on the X-ray machine head 4 for quick alignment and fixing of the X-ray machine head 4.

In a preferred embodiment, one side of the protective sealing box 1 is rotatably connected with the sealing end cover 2 through a hinge, and the other side is locked and fixed in an openable and closable way through a quick locking buckle. The quick locking buckle can be used for selecting a mature locking buckle, can be firmly connected and fixed, and is convenient to release and unlock.

In a preferred embodiment, a through hole 6 for the heat exchange tube 7 to pass through is formed in the protective tooling, a part of the through hole 6 is located on the protective sealing box 1, and the other part of the through hole 6 is located on the sealing end cover 2.

The inner dimension of the through hole 6 is basically consistent with the cross section dimension of the heat exchange tube 7, namely, the through hole is a round-like hole, so that the heat exchange tube 7 can be clamped through the protective sealing box 1 and the sealing end cover 2, and the protective tool is fixed on the heat exchange tube 7.

The through holes 6 are arranged eccentrically. In the application, the through hole 6 is formed by splicing two parts, namely a semicircular opening in cross section on the protective sealing box 1 and a semicircular opening in cross section on the sealing end cover 2; at least one semicircular opening is of an eccentric structure, namely the center of the semicircular structure is offset towards the direction of the other semicircle by a certain distance. Preferably, the outer diameter of the heat exchange tube is 19mm, the diameters of two semicircles forming the hole are 19mm, and the center position of one semicircle structure is offset by 0.5mm towards the direction of the other semicircle.

Preferably, as shown in fig. 5, lead plates 8 are provided on the inner sides of the protective seal case 1 and the seal end cover 2, and the lead plates 8 overlap at the splice joint between the protective seal case 1 and the seal end cover 2, and the width of the overlap coverage area is at least 10mm.

The round holes, namely the inner wall surfaces of the two semicircles are formed by lead plates, and the hardness of the lead material is far smaller than that of the heat exchange tube, so that the protective sealing box 1 and the sealing end cover 2 cannot scratch the heat exchange tube under the condition that the through holes 6 are eccentrically arranged, the protective sealing box can be fully contacted with the heat exchange tube and sealed, the protective tool can be firmly and fixedly installed on the heat exchange tube, and the radiation overflow can be avoided.

In a preferred embodiment, the groove 3 is arranged obliquely with respect to the heat exchanger tube 7, so that the X-ray machine head 4 arranged in the groove 3 is arranged obliquely with respect to the heat exchanger tube 7. According to the application, the heat exchange tube is vertically arranged, the upper section of the groove is close to the heat exchange tube, the lower section of the groove is far away from the heat exchange tube, the groove enables the X-ray machine head to have an inclination angle of 5-25 degrees, and the inclination arrangement of the X-ray machine head can shorten the horizontal distance between the X-ray machine head and the heat exchange tube under the condition of the same focal length, so that the size of a protection tool in a complex steam generator heat exchange tube is saved, and the protection tool is ensured to be applied to the detection work of a welding seam of the steam generator heat exchange tube.

In a preferred real-time manner, as shown in fig. 2, the quick-connect interface 5 is provided with two limiting holes 51, preferably, two limiting holes, so as to improve the stability of limiting;

The quick connect plug 41 is provided with a positioning post 42,

The limiting hole 51 has an inner diameter that is identical to the outer diameter of the positioning post 42,

When the positioning column 42 is inserted into the limiting hole 51, the ray outlet window 43 on the X-ray machine head 4 is located inside the protective sealing box 1 and faces to the position where the welding seam is located.

Preferably, the positioning post 42 is automatically locked after being inserted into the limiting hole 51,

An unlocking button 52 is provided on the quick connector 5, and the locking of the positioning column 42 is released by pressing the unlocking button 52, so that the positioning column 42 is allowed to withdraw from the limiting hole 51.

Preferably, an annular groove is formed in the positioning column 42, when the annular groove is embedded into the limiting hole 51, a telescopic clamping block is arranged in the limiting hole 51, the positioning column 42 is fixedly limited by embedding the clamping block into the annular groove, the positioning column 42 is placed to be separated from the limiting hole 51, the unlocking button 52 is connected with the clamping block, the clamping block is controlled to shrink by pressing the unlocking button 52, and the contact limitation with the positioning column 42 is separated.

The protection tool provided by the utility model can be used for fixing the X-ray flaw detector head on a welding line needing radiographic inspection, and the opening size of the double-wall double-image detection imaging can be adjusted by adjusting the radiographic angle and the offset distance, so that the operation is simple, the speed is high, the X-ray flaw detector head can be fixed at any welding line according to the requirement, the positioning is accurate and constant, the angle is fixed, and the exposure condition of each heat exchange tube is detected to be constant. Meanwhile, when the tool is used for detection, shielding measures are not required to be independently adopted for protection, so that the protection cost is reduced, the auxiliary time in the radiation detection process is shortened, and the detection efficiency is improved.

The utility model also provides a method for detecting the butt weld rays of the heat exchange tube of the steam generator, which comprises the following steps:

Step 1, cutting a film into a proper size, preferably 100X 50mm, simultaneously placing a sensitization screen and the film into a dark bag, sealing the dark bag, and placing the dark bag on a film fixing frame in a sealing end cover 2;

Step 2, attaching an image quality meter and a mark on the heat exchange tube 7, and fastening the protection sealing box 1 and the sealing end cover 2 on the heat exchange tube 7 through quick locking and buckling, wherein a weld joint to be detected is positioned in the protection tool;

Step 3, inserting the positioning column 42 of the quick connector 41 on the X-ray machine head 4 into the limit hole 51 of the quick connector 5, and pressing with force to finish the clamping installation of the X-ray machine head 4;

step 4, setting exposure parameters of the X-ray machine head 4, and irradiating a welding line by a beam;

step 5, after the beam is out, unlocking the quick locking buckle, so that the protective sealing box 1 and the sealing end cover 2 are not clamped and fixed on the heat exchange tube 7 any more, taking out the hidden bag, and carrying out darkroom treatment on the film;

And 6, moving the protective tool to a new weld joint position to be detected, and repeating the steps 1 to 5.

Examples:

The heat exchange component of the steam generator comprises a plurality of heat exchange units, each heat exchange unit is about 10 m long and half m in diameter, 50-80 heat exchange tubes are arranged in the heat exchange units, 665 heat exchange tubes are distributed in the heat exchange units in a different mode, the heat exchange tubes are not uniformly distributed, the space in the heat exchange units is narrow, the gap size between every two adjacent heat exchange tubes is 50-100mm, two welding seams are arranged on each heat exchange tube, each welding seam needs to be subjected to at least two transillumination detection, and the two transillumination angles are 90 degrees each other. Some of the heat exchange tubes in the heat exchange unit are shown in fig. 6 and 7.

Selecting a steam generator heat exchange tube butt weld radiographic inspection protection tool as shown in fig. 1 to inspect the heat exchange tubes, wherein fig. 6 shows a schematic diagram when the protection tool is arranged among a plurality of heat exchange tubes, and fig. 7 shows a cross-sectional view of fig. 6;

The method specifically comprises the following steps:

Step 1, cutting a film into a size specification of 100X 50mm, simultaneously placing a sensitization screen and the film into a dark bag, sealing the dark bag, and placing the dark bag on a film fixing frame in a sealing end cover 2;

Step 2, attaching an image quality meter and a mark on the heat exchange tube 7, and fastening the protection sealing box 1 and the sealing end cover 2 on the heat exchange tube 7 through quick locking and buckling, wherein a weld joint to be detected is positioned in the protection tool;

Step 3, inserting the positioning column 42 of the quick connector 41 on the X-ray machine head 4 into the limit hole 51 of the quick connector 5, and pressing with force to finish the clamping installation of the X-ray machine head 4;

step 4, setting exposure parameters of the X-ray machine head 4, and irradiating a welding line by a beam;

step 5, after the beam is out, unlocking the quick locking buckle, so that the protective sealing box 1 and the sealing end cover 2 are not clamped and fixed on the heat exchange tube 7 any more, and taking out the hidden bag;

And 6, moving an operator to the vicinity of the position of the next welding line through a lifting table, moving the protective tool to a new position of the welding line to be detected, and repeating the steps 1 to 5.

The time for executing the steps 1 to 5 once is about 2 minutes, two groups of detection work are arranged to work simultaneously, the detection work of all 665 heat exchange tubes is completed for 42 hours, and the production process requirement of the nuclear power equipment is met;

The welding seam transillumination image obtained by detection has good definition, can clearly confirm the welding quality of the welding seam, does not scratch the heat exchange tube in the whole detection process, and ensures the product quality of the steam generator.

The utility model has been described above in connection with preferred embodiments, which are, however, exemplary only and for illustrative purposes. On this basis, the utility model can be subjected to various substitutions and improvements, and all fall within the protection scope of the utility model.

Claims (9)

1. The utility model relates to a radiation detection protection tool for butt welding seams of heat exchange pipes of a steam generator, which is characterized in that the protection tool comprises a hollow protection sealing box (1),

A sealing end cover (2) is arranged at one end of the protective sealing box (1), the protective tool is fixed on the heat exchange tube through the cooperation of the protective sealing box (1) and the sealing end cover (2), and the weld joint to be detected is positioned in the protective tool;

The other end of the protective sealing box (1) is provided with a notch (3) with an arc-shaped section; the shape and the size of the notch (3) are matched with those of the side part of the X-ray machine head (4), so that the X-ray machine head (4) can be embedded into the notch (3), and the protective sealing box (1) and the X-ray machine head (4) are tightly adhered to each other;

A quick-connection interface (5) is arranged at the top of the protective sealing box (1); the quick-connection interface (5) is matched with a quick-connection plug (41) on the X-ray machine head (4) and is used for quickly aligning and fixing the X-ray machine head (4).

2. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 1, wherein,

One side between the protective sealing box (1) and the sealing end cover (2) is rotatably connected through a hinge, and the other side is locked and fixed in an openable and closable way through a quick locking buckle.

3. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 1, wherein,

The protection tool is provided with a through hole (6) for the heat exchange tube (7) to pass through, one part of the through hole (6) is positioned on the protection sealing box (1), and the other part of the through hole (6) is positioned on the sealing end cover (2).

4. The radiation detection and protection tool for the butt weld of the heat exchange tube of the steam generator according to claim 3, wherein the radiation detection and protection tool comprises a main body,

The inner dimension of the through hole (6) is basically consistent with the cross section dimension of the heat exchange tube (7), so that the heat exchange tube (7) can be clamped through the protective sealing box (1) and the sealing end cover (2), and the protective tool is fixed on the heat exchange tube (7).

5. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 4, wherein,

The through holes (6) are arranged eccentrically.

6. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 1, wherein,

The inner sides of the protective sealing box (1) and the sealing end cover (2) are both provided with lead plates (8), the lead plates (8) are overlapped and covered at the splicing seam between the protective sealing box (1) and the sealing end cover (2), and the width of the overlapped and covered area is at least 10mm.

7. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 1, wherein,

The notch (3) is obliquely arranged relative to the heat exchange tube (7), so that the X-ray machine head (4) arranged in the notch (3) is obliquely arranged relative to the heat exchange tube (7).

8. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 1, wherein,

A limiting hole (51) is arranged on the quick connection interface (5),

A positioning column (42) is arranged on the quick-connect plug (41),

The inner diameter size of the limiting hole (51) is consistent with the outer diameter size of the positioning column (42),

When the positioning column (42) is inserted into the limiting hole (51), a ray outlet window (43) on the X-ray machine head (4) is positioned inside the protective sealing box (1) and faces to the position where the welding line is positioned.

9. The steam generator heat exchange tube butt weld radiographic inspection protection tooling of claim 8, wherein,

The positioning column (42) is automatically locked after being inserted into the limiting hole (51),

An unlocking button (52) is arranged on the quick connection interface (5), and the locking of the positioning column (42) is released by pressing the unlocking button (52), so that the positioning column (42) is allowed to withdraw from the limiting hole (51).