JPH0724395A - Coated film cladding device - Google Patents

Abstract

PURPOSE:To make constant and uniform the temperature of the surface of a coated film coated on the inner face of an ICM tube. CONSTITUTION:A laser emission torch device 11 comprising a condenser lens and a reflection mirror for reflecting laser beams from the condenser lens and emitting the same to a coated film, a cladding laser device 27 for transmitting the laser beams for cladding the coated film to a condenser lens of the laser emission torch device 11, and a distance measurement laser device 30 for finding the distance from an axial center of the laser emission torch device 11 to the surface of the coated film are provided in a rotating tube. Also a control device 33 for processing signals from the distance measurement laser device 30 is provided, and command signals 32 corresponding to the measured distance is issued from the control device 33 to the cladding laser device 27, and the energy strength per unit area of the surface of the coated film is made constant by controlling the output of the cladding laser device 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating film cladding apparatus.

[0002]

2. Description of the Related Art Generally, in a reactor pressure vessel, FIG.
As shown in FIG. 2, at the bottom of the pressure vessel body 1, an ICM (I
A tube 2 called “ncore Monitor Housing” is penetrated, and the outer peripheral portion of the tube 2 on the inner surface side of the pressure vessel main body 1 is welded and fixed to the pressure vessel main body 1.

However, when the pipe 2 is welded to the pressure vessel main body 1, stress corrosion cracking may occur due to residual stress generated by the welding. Therefore, the required height including the welded portion 3 on the inner peripheral surface of the pipe 2 is required. In this range, a metal powder containing nickel, chromium, molybdenum, iron or the like in the form of a paste is applied to form a coating film 4, and the coating film 4 is irradiated with a laser to be solidified, so-called cladding. By performing the treatment, the corrosion cracking is prevented.

As a conventional apparatus for performing such a cladding treatment, there is a coating film cladding apparatus as shown in FIGS.

In FIG. 8, reference numeral 5 denotes an elevating and lowering drive device connected to the lower end of a pipe 2 penetrating and welded to the pressure vessel body 1 via a short pipe 6. The elevating and lowering drive device 5 includes an elevating motor 7 and The bevel gear 8 and the pinion 9 are provided.

Reference numeral 10 denotes an elevating rod vertically supported by a frame of the elevating and lowering drive device 5 so as to elevate and lower. The elevating rod 10 extends upward, and the upper end side is inserted into the pipe 2. The pinion 9 meshes with a rack provided outside the rod 10, and the elevating motor 7 rotates the pinion 9 via a bevel gear 8 to elevate the elevating rod 10.

Reference numeral 11 denotes a laser irradiation torch device arranged at the upper end of the elevating rod 10, and the laser irradiation torch device 11
As shown in FIGS. 9 and 10, a vertically-oriented hollow support cylinder 12 fixed to the upper end of the elevating rod 10, and a support cylinder 12
A vertically-oriented, hollow rotating member having a guide portion 14a that is rotatably supported by a bearing 13 fitted inside the upper end of the guide tube and that extends upward and that hangs down to a midway portion in the longitudinal direction of the support tube 12 is integrally formed in the axial center portion. A cylinder 14, a rotatable hollow guide cylinder 16 fitted and supported by a bearing 15 fitted in the support cylinder 12 so as to be substantially concentric with the support cylinder 12, and an outer periphery of an upper end of the guide cylinder 16. A gear (not shown) that meshes with the gear 16a engraved on the
And a reduction gear part 17 having a hollow hole 17a formed in the center of the guide cylinder 16 and communicating with the hollow part of the guide cylinder 16;
On the other hand, a stator 20a is attached to the support cylinder 12 and a hollow guide cylinder 19 which extends upward so as to have the same axis and whose upper end is connected to the lower end of the guide portion 14a of the rotary cylinder 14 via a joint 18. The rotor 20b is attached to the guide cylinder 16, and the motor 20 is configured to rotate and drive the rotary cylinder 14 by rotating the guide cylinder 16, and the condenser lens 21 fitted into the hollow hole 14b of the rotary cylinder 14. ,
An optical fiber connector 23 housed in the lower end of the hollow hole 14b of the rotary cylinder 14 and adapted to project a laser beam 22 toward an upper condenser lens 21, and an optical fiber connector 23.
Laser beam 22 projected from the laser beam and condensed by the condenser lens 21
And a reflection mirror 24 housed in the upper end of the hollow hole 14b of the rotary cylinder 14 so as to change the incident direction of the beam from the vertical state to the horizontal state by approximately 90 degrees.

The optical fiber connector 23 includes a rotary cylinder 14
An optical fiber cable 26, which is fitted and supported by a bearing 25 fitted in the hollow part of the rotary tube 14 and which is prevented from rotating even when the rotary tube 14 rotates, is connected to the guide portion of the rotary tube 14. Hollow hole 14a, guide tube 19
Hollow hole, hollow hole 17a of the reduction gear unit 17, guide cylinder 16
Of the optical fiber cable 26, which extends downward through the hollow hole of the support cylinder 12 and has a tip end of the optical fiber cable 26, which is provided with a laser device for cladding such as a laser oscillator 27.
It is connected to the.

In FIG. 9, 14c is a through hole which is provided on the side of the rotary cylinder 14 and through which the laser beam 22 passes.

When the coating film 4 applied to the inner circumference of the pipe 2 is to be clad, the lifting drive device 5 is connected to the lower end of the pipe 2 via the short pipe 6, and the lifting motor 7 of the lifting drive device 5 is connected. To drive. Therefore, as a result of the pinion 9 rotating via the bevel gear 8 and the lifting rod 10 being raised, the laser irradiation torch device 11 is inserted into the tube 2 and is raised to the portion where the coating film 4 of the tube 2 is applied. To reach.

When the laser irradiation torch device 11 reaches a predetermined position of the coating film 4 applied inside the tube 2, the motor 20 is driven. Then, the guide tube 16 rotates and the guide tube 16 rotates.
Is rotated by the reduction gear unit 17 to rotate the guide cylinder 19, and the guide cylinder 19 rotates the rotary cylinder 14.

Also, the cladding laser device 27 is activated along with the rotation of the rotary cylinder 14 to oscillate laser light,
The laser light transmitted through the optical fiber cable 26 is made incident from the optical fiber connector 23 toward the condenser lens 21. For this reason, the laser light 22 that has passed through the condenser lens 21 is narrowed down, reflected by the reflection mirror 24 and changed in direction by 90 degrees, passes through the through hole 14c, and is irradiated onto the coating film 4 on the inner peripheral surface of the tube 2 to apply Cladd the membrane 4. As the laser light, for example, a YAG laser is used.

When the rotary cylinder 14 makes one revolution and the coating film 4 is clad over the entire periphery, the elevating drive device 5 is driven to elevate the laser irradiation torch device 11, and the next step is carried out in the same manner as described above. The coating film 4 is clad at the position.

Therefore, in order to uniformly dissolve the coating film 4 over the entire surface to obtain a good cladding, it is necessary to eliminate the unevenness of the temperature of the surface of the coating film 4 and heat the coating film 4 uniformly at a constant temperature. is there.

Therefore, as shown in FIG. 11, the conventional laser light 22 has a predetermined distance (out-of-focus distance) D from the focus 28.
The surface of the coating film 4 is irradiated at a position deviated by f, and the defocusing distance Df is adjusted in advance before the start of operation.

[0016]

If the distance D from the axial center 29 of the condenser lens 21 shown in FIG. 11 to the coating film 4 is as designed, the defocusing distance Df is adjusted in advance before the operation is started. If this is done, there will be no particular hindrance to the cladding work.

However, since the tube 2 is distorted due to thermal deformation or the like during welding, when the distance D from the axis 29 of the condenser lens 21 to the coating film 4 changes and the defocusing distance Df changes, the coating film changes. The energy intensity per unit area of the laser beam 22 applied to the surface of No. 4 also changes, and the temperature of the surface of the coating film 4 is not uniform. As a result, the melting of the surface of the coating film 4 becomes different and good cladding cannot be performed. There's a problem.

In view of the above situation, the present invention changes the distance D from the axis 29 of the condenser lens 21 to the surface of the coating film 4 due to the distortion of the tube 2 and the surface position of the coating film 4 deviates from the reference position. However, the purpose is to make the temperature of the surface of the coating film 4 constant and uniform during cladding.

[0019]

A first means comprises a laser irradiation torch device capable of moving up and down in an ICM tube, a cladding laser device, a distance measuring laser device and a control device, and the laser irradiation is provided. The torch device is the IC
A rotating cylinder that can rotate in the circumferential direction of the M tube, a condensing lens that is housed in the rotating cylinder and that collects the incident laser light for cladding and laser light for distance measurement, and a condensing lens that is housed in the rotating cylinder. Distance measurement in which the laser beams condensed by the condenser lens are reflected in the radial direction of the ICM tube to irradiate the coating film applied to the inner circumference of the ICM tube and reflected back by the coating film to return. A reflection mirror configured to reflect the laser light for application to the condenser lens and return it to the condenser lens, wherein the cladding laser device provides the cladding laser light for cladding the coating film to the condenser lens. The distance measuring laser device is configured to oscillate the distance measuring laser beam toward the condenser lens, and the distance measuring laser device returns through the condenser lens. It is configured to detect the position of the coating film in the ICM tube radial direction based on the application laser beam, and the control device processes the signal from the distance measuring laser device to process the cladding laser beam on the surface of the coating film. Is configured so that a command signal for controlling the output of the cladding laser light can be given to the cladding laser device so that the energy intensity per unit area becomes constant.

The second means includes a laser irradiation torch device capable of moving up and down in the ICM tube, a cladding laser device, a distance measuring laser device, and a control device.
The laser irradiation torch device is housed in a rotating cylinder that can rotate in the circumferential direction of the ICM tube, is movable in the longitudinal direction of the rotating cylinder by an actuator, and is incident on the cladding laser light and A condenser lens for condensing the distance measuring laser light and each of the laser light accommodated in the rotary cylinder and condensed by the condenser lens are reflected in the radial direction of the ICM tube to the inner circumference of the ICM tube. The cladding laser device is provided with a reflection mirror that irradiates the coated film and reflects the reflected laser beam from the coating film to return to the condenser lens. The cladding laser light for cladding the coating film is configured to oscillate toward the condenser lens. It is configured to oscillate light toward the condenser lens and to detect the position of the coating film in the ICM tube radial direction based on the distance measuring laser light that has returned through the condenser lens, The control device processes the signal from the distance measuring laser device to move the condenser lens so that the defocusing distance from the focal point of the cladding laser light emitted to the coating film surface is constant. A command signal is provided to the actuator.

[0021]

According to the first means, the output of the cladding laser beam with which the coating film surface is irradiated is adjusted by the position of the coating film surface in the ICM tube radial direction, whereby the energy per unit area of the coating film surface is adjusted. The intensity is controlled to be constant, and in the second means, the position of the condenser lens is adjusted by the position of the surface of the coating film in the radial direction of the ICM tube, whereby the coating film is irradiated from the focal point of the cladding laser. The defocus distance to the surface is controlled to be constant. Therefore, in both the first and second means, the coating film is heated to a constant and uniform temperature during the cladding.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an embodiment of the present invention,
In this embodiment, the distance measuring laser device 30 for measuring the distance D from the axis 29 of the condenser lens 21 to the coating film 4 shown in FIG. 11 and the distance D obtained by the distance measuring laser device 30. The distance measuring laser is provided with a control device 33 for giving a command signal 32 to the cladding laser device 27 so that the energy intensity of the laser beam applied to the surface of the coating film 4 based on the signal 31 of FIG. Similarly to the optical fiber cable 26 shown in FIG. 9, the optical fiber cable 34 connected to the device 30 also passes through the guide tubes 16 and 19 of FIG. 9 and is connected to the optical fiber connector 23.

In the present embodiment, the configuration of the parts other than the distance measuring laser device 30 and the control device 33 is the same as that shown in FIGS. 9 and 10.

Next, the operation of this embodiment will be described with reference to FIGS.

As in the conventional case, when the coating film 4 is clad, the motor 20 is driven to rotate the rotary cylinder 14 of the laser irradiation torch device 11 and the laser beam 22 oscillated from the cladding laser device 27 is applied. Membrane 4
And the coating film 4 is clad.

At the same time, the distance measuring laser device 30 also oscillates a laser beam such as a He--Ne laser,
The laser light is emitted from the optical fiber connector 23 via the optical fiber cable 34, is reflected by the reflection mirror 24 toward the coating film 4, is reflected by the coating film 4, and has a route opposite to that of the irradiation. After that, the signal returns to the distance measuring laser device 30, and from the signal, the distance measuring laser device 30 obtains the distance D from the axis 29 of the condenser lens 21 shown in FIG. 11 to the surface of the coating film 4 and the obtained distance. D is given to the controller 33.

Thus, the control device 33 processes the signal 31 corresponding to the distance D to make the output KW (for maintaining the energy intensity Ef per unit area of the laser beam 22 irradiated on the coating film 4 constant. = K · (Ef / D)) (where K is a constant) and a command signal 32 corresponding to the obtained output KW is given from the control device 33 to the cladding laser device 27. Therefore, the output of the laser light oscillated from the laser oscillator built in the cladding laser device 27 is the same as the laser light 2 emitted to the coating film 4.
2 is adjusted so that the energy intensity per unit area is constant, and as a result, even when the surface of the coating film 4 is distorted,
The surface temperature of the coating film 4 is constant and uniform, so that there is no difference in the penetration of the coating film 4 and good cladding can be performed.

When the measured distance D becomes large,
The output KW of the laser light 22 decreases, but the area of the coating film 4 surface irradiated with the laser light 22 decreases in inverse proportion to the distance D. Therefore, the unit area of the laser light 22 on the surface of the coating film 4 decreases. When the energy intensity becomes constant and the measured distance D becomes smaller, the output of the laser light 22 increases,
Since the area on the surface of the coating film 4 irradiated with the laser beam 22 increases in inverse proportion to the distance D, the coating film 4 of the laser beam 22 is irradiated.
The energy intensity per unit area on the surface is constant.

Next, how to obtain the distance D from the axis 29 (see FIG. 11) of the condenser lens 21 to the surface of the coating film 4 by the distance measuring laser device 30 will be described with reference to FIG.

As shown in FIG. 2, the laser device 3 for distance measurement is used.
0 is a laser oscillator 35 such as He-Ne, and a half arranged in the path of the oscillated laser light 36 and arranged to transmit a part of the laser light 36 and reflect a part thereof to change the direction by 90 degrees. Half mirror 38 arranged so that the laser light 36 from the mirror 37 and the half mirror 37 is transmitted, and the laser light 36 reflected on the surface of the coating film 4 and returned is reflected to change the direction by 90 degrees. Laser light 36 reflected from the reflection mirror 39 and the half mirror 38 that reflects the laser light 36 from
Is reflected to change the direction by 90 degrees and the reflection mirror 39
Half mirror 40 which transmits the laser beam 36 from the laser beam, and the arithmetic unit with the light receiving element 41 which receives the laser beam 36 transmitted or reflected by the half mirror 40 and obtains the deviation amount ± ΔD from the reference distance Do. 42 is provided.

A part of the laser beam 36 oscillated from the laser oscillator 35 is a half mirror 37 and a reflection mirror 3.
The light receiving element 41 is reflected by 9 and passes through the half mirror 40.
Is received by the half mirror 3 and given to the arithmetic unit 42.
The laser light 36 that has passed through 7, 38 is reflected by the coating film 4 and returns, and is reflected by the half mirrors 38, 40 to receive the light receiving element 4.
The light is received by 1 and is given from the light receiving element 41 to the arithmetic unit 42.

The arithmetic unit 42 utilizes the interference between the laser light from the half mirror 38 side and the laser light from the reflecting mirror 39 side to determine how many interference fringes are generated when the reference distance Do changes. Counting, the deviation amount is obtained by ± ΔD = ± λn, and the deviation amount ± λn is added to the reference distance Do to obtain the distance D (= Do ± ΔD). Where λ is the laser light 3
The wavelength is 6 and n is the number of interference fringes.

3 to 7 show another embodiment of the present invention. In this embodiment, light is focused so that the defocus distance from the focus 28 of the irradiated laser beam 22 to the surface of the coating film 4 is kept constant. The position of the lens 21 in the height direction is adjusted.

Inside the hollow hole 14b of the rotary cylinder 14 which constitutes the laser irradiation torch device 11, the laser irradiation torch device moves in a direction parallel to the axis of the rotary cylinder 14, that is, in a direction parallel to the axis 29 of the condenser lens 21 in FIG. The lens support cylinder 43 is fitted as much as possible, and the condenser lens 21 is fitted inside the lens support cylinder 43. A plurality of blocks 44, each having an internal thread formed parallel to the axis of the rotary cylinder 14, are attached to the inner circumference of the lower end of the lens support cylinder 43 at required intervals in the circumferential direction. A motor 45 is disposed inside the lens support cylinder 43 so as to be positioned below the lens support cylinder 43, and a rotation shaft 46 driven by the motor 45 is engraved with a male screw.
The male screw portion of 6 is screwed into the female screw of the block 44. Further, the rotating shaft 46 is rotatably supported by a bearing 47 arranged in the inner periphery of the hollow hole 14b of the rotating cylinder 14 at an intermediate portion thereof.

From the distance measuring laser device 30, a signal 53 of a deviation amount ± ΔDf from the reference defocusing distance Dfo can be given to the control device 48.
8 can give a command signal 50 for driving to the motor 45 via the cable 49.
The feedback signal 51 from 5 can be fed back to the control device 48 via the cable 52.

In this embodiment, except for the above-mentioned components, the coating film cladding apparatus of FIG. 1 has the same structure, and the same components as those shown in the coating film cladding apparatus of FIG. Is attached.

Also in this embodiment, as in the case of the above-described embodiments, the laser light oscillated from the cladding laser device 27 is reflected by the reflection mirror 24 through the condenser lens 21 and is applied to the coating film 4. The coating film 4 is clad, laser light is also oscillated from the distance measuring laser device 30, and the laser light signal reflected by the coating film 4 and returned serves as a preset reference. The deviation amount ± ΔDf with respect to the defocusing distance Dfo is obtained by the distance measuring laser device 30, and the obtained deviation amount ± ΔDf is given to the control device 48 as a signal 53.

Therefore, when the deviation amount is ± ΔDf, the defocusing distance is Dfx = Dfo ± ΔDf. Therefore, in order to return the defocusing distance Dfx to the reference defocusing distance Dfo, the height of the condenser lens 21 is increased. It is necessary to adjust the vertical position. Therefore, in this case, the control device 48 outputs the command signal 50 corresponding to the amount ΔDf for making the detected deviation amount ± ΔDf to zero, and gives it to the motor 45 to drive the motor 45. As a result, the rotation shaft 46 rotates, the lens support cylinder 43 moves up and down, and the position in the height direction of the condenser lens 21 is adjusted. As a result, the defocusing distance always matches the reference defocusing distance Dfo. Laser device for cladding 2
Even when the output of the laser light oscillated from 7 is constant, the energy intensity per unit area on the surface of the coating film 4 is kept constant, so that the surface temperature of the coating film 4 becomes constant and uniform, Therefore, there is no difference in the penetration of the coating film 4, and good cladding can be performed.

The deviation amount ± ΔDf in this embodiment may be obtained in exactly the same manner as the deviation amount ± ΔD in the above-mentioned embodiments.

Next, from the optical fiber connector 23 to the coating film 4, how to adjust the position of the condenser lens 21 when the reference defocus distance Dfo changes to reach the defocus distance Dfx. FIG. 7 is a diagram in which the system path is simplified and linearly shown.
This will be explained with reference to (a), (b) and (c).

For example, when the surface of the coating film is at a predetermined position 4a and the defocusing distance is the reference defocusing distance Dfo as shown in FIG. 7A, the position of the condenser lens 21 is adjusted. do not have to. However, the surface of the coating film is shown in Fig. 7.
As shown in FIG. 7B from the predetermined position 4a shown in FIG. 7A, the position 4b is deformed in the direction away from the optical fiber connector 23 (that is, the inner diameter of the coating film 4 is increased).
7A, the condenser lens 21 is moved leftward from the position shown in FIG. 7A (that is, the condenser lens 21 is lowered), and the focus 28 is moved rightward in FIG. 7A. Let As a result, as shown in FIG. 7B, the defocus distance from the focal point 28 to the surface of the coating film is adjusted to Dfo.

Further, the surface of the coating film is deformed from the predetermined position 4a shown in FIG. 7A toward the optical fiber connector 23 as shown in FIG. When the inner diameter is decreased to the position 4c, the condenser lens 21 is moved rightward from the position shown in FIG. 7A (that is, the condenser lens 21 is raised), and the focus 28 is moved to the position shown in FIG. Move to the left in (a). As a result, the defocus distance from the focus 28 to the surface of the coating film is adjusted to Dfo.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0045]

In the coating film cladding apparatus of the present invention, since the temperature of the coating film surface can be made uniform and uniform on the whole according to any one of claims 1 and 2, the melted state of the coating film can be made uniform. The excellent effect of being able to perform good cladding can be achieved.

[Brief description of drawings]

FIG. 1 is an elevational view of an embodiment of a coating film cladding apparatus of the present invention.

FIG. 2 is a conceptual diagram of a mechanism for detecting a positional shift of a coating film surface irradiated with laser light in the coating film cladding apparatus of FIG.

FIG. 3 is an elevational view of another embodiment of the coating film cladding apparatus of the present invention.

FIG. 4 is a vertical cross-sectional view of the tip of a laser irradiation torch device applied to the coating film cladding device of FIG.

5 is a longitudinal sectional view of a mechanism for adjusting the position of a condenser lens applied to the laser irradiation torch device of FIG.

6 is a VI-VI direction arrow view of FIG.

7 (a), (b) and (c) are conceptual diagrams showing how to adjust the position of the condenser lens when the position of the coating film surface changes.

FIG. 8 is an elevational view of an example of a conventional coating film cladding apparatus.

9 is a longitudinal sectional view of a laser irradiation torch device in the coating film cladding device of FIG.

10 is an enlarged vertical cross-sectional view of a portion of a mechanism for rotating a rotary tube of the laser irradiation torch device of FIG.

11 is a side view showing the relationship between the distance from the center of the torch to the coating film surface and the defocusing distance of the laser light emitted from the laser irradiation torch device of FIG.

FIG. 12 is a vertical cross-sectional view in the vicinity of a coating film application portion of a pipe to which a coating film cladding device is applied.

[Explanation of symbols]

 2 tube (ICM tube) 4 coating film 11 laser irradiation torch device 14 rotating cylinder 21 condenser lens 22 laser light (laser light for cladding) 24 reflecting mirror 27 laser device for cladding 28 focus 30 distance measuring laser device 31 signal 32 command signal 33 control device 36 laser light (laser light for distance measurement) 45 motor (actuator) 48 control device 50 command signal 53 signal Dfo, Dfx defocusing distance

Claims (2)

[Claims] 1. A laser irradiation torch device capable of moving up and down in an ICM tube, a cladding laser device, a distance measuring laser device, and a control device, wherein the laser irradiation torch device is in a circumferential direction of the ICM tube. And a condensing lens that is housed in the rotating cylinder and condenses the incident laser light for cladding and incident laser light for distance measurement, and a condensing lens that is housed in the rotating cylinder and includes the condensing lens. The focused laser beams are reflected in the radial direction of the ICM tube to irradiate the coating film applied to the inner circumference of the ICM tube, and the distance measuring laser light reflected by the coating film and returned is reflected. And a reflecting mirror adapted to be returned to a condenser lens, wherein the cladding laser device collects the cladding laser light for cladding the coating film. The laser device for distance measurement is configured to oscillate toward the lens, and the laser device for distance measurement is configured to oscillate laser light for distance measurement toward the condensing lens, and the laser device for distance measurement returned via the condensing lens. The controller is configured to detect the position of the coating film in the ICM tube radial direction based on the laser light, and the control device processes a signal from the distance measuring laser device to detect the laser light for cladding on the surface of the coating film. A coating film cladding apparatus, which is configured so that a command signal for controlling the output of the laser light for cladding so that the energy intensity per unit area is constant can be given to the laser apparatus for cladding. 2. A laser irradiation torch device capable of moving up and down in the ICM tube, a cladding laser device, a distance measuring laser device and a control device, wherein the laser irradiation torch device is in the circumferential direction of the ICM tube. And a condensing lens that is housed in the rotating cylinder, is movable in the longitudinal direction of the rotating cylinder by an actuator, and that collects incident laser light for cladding and incident laser light for distance measurement. Each of the laser beams housed in the rotary cylinder and condensed by the condenser lens is reflected in the radial direction of the ICM tube to irradiate the coating film applied to the inner circumference of the ICM tube and reflected by the coating film. The cladding laser device is provided with a reflection mirror configured to reflect the returned distance measuring laser light and return it to the condenser lens. The cladding laser light for cladding is oscillated toward the focusing lens, and the distance measuring laser device is configured to oscillate the distance measuring laser light toward the focusing lens. Also, the control device is configured to detect the position of the coating film in the radial direction of the ICM tube based on the distance measuring laser beam returned via the condenser lens. The controller processes the signal from the distance measuring laser device. And a command signal for moving the condensing lens so that the defocusing distance from the focal point of the cladding laser light irradiated to the coating film surface is constant to the actuator. Characteristic coating film cladding device.