JP2000084685A - Laser beam cutting and weld equipment for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and efficiently conduct a sound welding work by fixing a laser beam machine to a wall face, inserting a laser beam from a piping opening part of a wall face side, aligning the beam with a piping center axis line with a positioning mechanism and moving a laser irradiation optical system with a drive device in the rotational and axial directions. SOLUTION: A fixing pin with flange 62 is inserted into an opening 61 for fixing laser beam cutting weld equipment of a wall face 3, the laser beam cutting/welding equipment is fixed to the wall face 3. A laser beam irradiation optical system 1 is moved in the axial direction and inserted into a piping opening part. Due to an effect of a compliance device 50, the laser beam irradiation optical system 1 is freely inclined corresponding to sliding with the piping opening part, axial lines are gradually aligned each other. The laser beam irradiation optical system 1 is inserted into a piping 71, a positioning device is brought into contact with an inner face of the piping 71, axial lines are aligned each other, the deviation is set to <=1 mm. The laser beam irradiation optical system 1 is positioned at a prescribed position in the piping 71, rotated around the axis and cuts or welds the piping 71 from the inner face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser cutting / welding apparatus for piping, and more particularly, to a pipe mounted vertically on a wall of a structure such as a nuclear reactor or a fusion reactor from the inner surface. The present invention relates to a laser cutting / welding apparatus for piping that can be welded / cut by remote control.

[0002]

2. Description of the Related Art In an environment where humans cannot access in a radiation environment, such as maintenance of nuclear reactors and internal structures of a fusion reactor,
When remotely replacing and repairing or welding a structure, a laser cutting and welding device is used. In particular, when welding or cutting from the outer surface of the pipe is difficult under the above-described environment, a laser cutting / welding device is inserted into the pipe to perform welding / cutting at a predetermined position. I have.

Therefore, for example, in maintenance of a fusion reactor, a large robot is inserted into a vacuum vessel, and a wall having a weight of 1 to 5 tons is removed or attached using the robot, or A laser cutting and welding device must be inserted into the pipe using this robot. However, since the robot moves a heavy object, the positioning accuracy is expected to be about ± 10 mm, and the robot is inserted into a laser cutting / welding apparatus by using the robot in a pipe having an inner diameter of 10 mm to 40 mm. Requires a special mechanism, and furthermore, there is a point in space that is difficult to hold the laser cutting / welding apparatus in the above-mentioned pipe, and further, a jig for fixing the laser cutting / welding apparatus. There are problems such as the need to develop

In addition, since the lens and mirror of the condensing optical system in the conventional laser cutting and welding apparatus are mounted on a fixed lens holder, there is also a problem that welding is impossible unless the pipes have the same inner diameter. is there.

The present invention has been made in view of the above points,
It is an object of the present invention to obtain a laser cutting / welding apparatus for pipes that can easily and efficiently perform welding work at the time of replacement and repair of a nuclear reactor internal structure and the like and that can perform more reliable and sound welding. I do.

[0006]

According to the first aspect of the present invention,
In a laser cutting / welding apparatus for piping that laser cuts / welds a pipe vertically mounted on a wall from the inner surface, a positioning mechanism is provided that can be inserted from the pipe opening on the wall and aligns the axis with the center axis of the pipe. A laser irradiation optical system, a drive device for rotating the laser irradiation optical system around an axis and moving in the axial direction, and a fixing device for the wall surface are provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the positioning mechanism is provided in the outer cylinder of the laser irradiation optical system in a circumferential direction, and is provided with a plurality of radially outwardly repelled. It has a positioning sphere.

According to a third aspect of the present invention, in the first aspect of the invention, the driving device is mounted on the base of the fixing device so as to be able to move and tilt to a certain extent in the axial direction by a compliance mechanism. It is characterized by having.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the laser irradiation optical system is disposed in the nozzle cylinder, and transmits an optical fiber for transmitting a laser beam emitted from a laser oscillator. One or more lenses for collimating the laser light emitted from the lens, a condenser lens for condensing the laser light emitted from the lens, and a mirror for changing the laser light emitted from the condenser lens in the radial direction. Wherein the condenser lens is mounted on the nozzle cylinder so as to be adjustable in the axial direction of the laser irradiation optical system.

[0010] Further, the invention according to claim 5 is based on claim 1.
In the invention described above, a fume suction port is opened at a tip portion of the laser irradiation optical system, and the fume suction port is provided outside the apparatus through a pipe provided along the laser irradiation optical system. It is characterized by being communicated with.

According to a sixth aspect of the present invention, in the first aspect of the invention, the fixing device has fixing pins respectively inserted into two or more holes provided in the wall surface in advance. An engagement piece is provided at the tip of the pin, the engagement piece being movable in the radial direction and engaging with a clamp groove formed on the inner peripheral surface of the hole when the pin advances in the radial direction.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, a rotating shaft is disposed concentrically on the fixing pin, and the movable member is screwed to a screw portion at the tip of the rotating shaft. A first link is pivotally connected, and a tip of the first link is pivotally connected to a tip of a second link which is pivotally connected to a distal end of the fixing pin. The first and second links are capable of moving back and forth in the radial direction.

[0013]

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

FIG. 1 is a diagram showing a schematic configuration of a laser cutting / welding apparatus according to the present invention. The laser cutting / welding apparatus is roughly classified into an optical system 1 for laser irradiation for cutting / welding a pipe, and a laser irradiation apparatus. A driving device 2 for rotating the irradiation optical system 1 about its axis and moving it in the axial direction, and a fixing device 4 for fixing the driving device 2 to the wall surface 3
It is composed of

That is, a hollow drive shaft 5 is inserted through the center axis of the drive device 2, and the laser irradiation optical system 1 is connected to the tip of the drive shaft 5.

As shown in FIG. 2, a spiral groove 6 and an axially extending spline groove 7 are formed on the outer periphery of the drive shaft 5 at a portion corresponding to the drive device 2. The thread portion 8a of the ball screw nut 8 is screwed into the groove 6 and the ridge 9 of the spline nut 9 is fitted into the spline groove 7.
a is engaged.

The ball screw nut 8 and the spline nut 9 are rotatably housed adjacent to each other in a fixed support cylinder 10. The ball screw nut 8 and the spline nut 9 are connected to the fixed support cylinder 10 via a first gear 11. And a second drive shaft motor 14 for rotatingly driving the spline nut 9 via a second gear 13, and these are a cylindrical outer cylinder. 15.

When the first drive shaft motor 12 rotates, the ball screw nut 8 is rotated via the first gear 11.
Is rotated. Therefore, when the second drive shaft motor 14 is stopped, the protrusion 9a of the spline nut 9 is engaged with the spline groove 7 of the drive shaft 5, so that the drive shaft 5 does not rotate. Due to the rotation of the ball screw nut 8, it is moved only in the axial direction. That is, the drive shaft 5 moves the laser irradiation optical system 1 in the axial direction.

On the other hand, when the second drive shaft motor 14 is rotated, the spline nut 9 is rotated via the second gear 13, and the drive shaft 5 is rotated by the ridge 9a.
Then, when the ball screw nut 8 is fixed, the drive shaft 5
Is rotated and simultaneously moved in the axial direction. Therefore, in order to avoid the movement in the axial direction, the first driving motor 12
Are rotated in synchronization with each other, the drive shaft 5 rotates only. Thus, the rotation of the laser irradiation optical system 1 is performed.

FIG. 3 is a sectional view showing a schematic configuration of the laser irradiation optical system 1 connected to the tip of the drive shaft 5, and shows a central axis of a nozzle tube 16 of the optical system formed in a cylindrical shape. A central axis 18 on which a laser transmission fiber 17 is coaxially provided is disposed in the portion, and a laser beam emitted from the laser transmission fiber 17 is parallelized in a nozzle cylinder on the tip side of the central axis 18. A first lens 19 and a second lens 20 are provided, and a condensing lens 21 and a polarizing mirror 22 are sequentially provided in front of the first lens 19 and the second lens 20. A spherical insertion head 23 is provided on the tip side of the polarizing mirror 22. Have been.

The laser light emitted from the laser transmission fiber 17 from the laser oscillator (not shown)
The light is collimated by a lens 19 and a second lens 20, then condensed by a condenser lens 21,
The laser beam is polarized in the radial direction, and is irradiated as convergent light 25 from a laser irradiation port 24 opened at one side of the tip of the nozzle cylinder 16.

FIG. 4 is an enlarged cross-sectional view of the tip of the optical system nozzle barrel 16. A cylindrical condenser lens mounting barrel 26 is concentric with the nozzle barrel 16 on the inner peripheral surface near the tip of the nozzle barrel 16. The condenser lens 21 is disposed so as to be slidable in the axial direction of the nozzle cylinder 16.
Is installed. A spring 27 is interposed between a step portion on the distal end side of the condenser lens attachment tube 26 and a step portion formed on the inner peripheral surface of the nozzle tube 16, and the condenser lens attachment tube 26 is rearward (right in the figure). ). On the other hand, the rear end of the condenser lens mounting cylinder 26 is slidably inserted into an annular cylinder 28 formed on the peripheral wall of the nozzle cylinder 16. A gas supply pipe 29 for driving a condenser lens disposed along the nozzle tube 16 is opened.

Thus, air or an inert gas is supplied from an air or inert gas supply source provided outside the apparatus to the condensing lens driving gas supply pipe 29 through a supply apparatus described later, and the pressure in the cylinder 28 is reduced. When it is raised, the pressure of the air or the inert gas causes the condenser lens mounting barrel 26 to move forward against the force of the spring 27. When the pressure of the air or the inert gas is eliminated, the spring 27
The condensing lens mounting cylinder 26 returns to its original position behind by the force of. That is, by increasing the pressure in the cylinder 28, the condenser lens 21 is advanced through the condenser lens mounting tube 26, and by reducing the pressure in the cylinder 28, the condenser lens 21 is moved through the condenser lens mounting tube 26. Is moved back to the original position, thereby changing the focal position of the laser beam.

The nozzle cylinder 16 is provided with an inert gas supply port 30 opening at the laser irradiation port 24 and a fume absorbing port 31 opening at the tip of the nozzle.
The inert gas supply port 30 and the fume absorption port 31
It is connected to a piping, which will be described later, provided along the nozzle cylinder 16.

On the other hand, a positioning device 32 is provided at an intermediate portion of the nozzle cylinder 16 at two locations separated in the axial direction. In other words, the outermost periphery of the nozzle cylinder 16 has three concentric circles.
A pair of ball seats 33a and 33b formed on inclined surfaces whose opposing surfaces expand outward are provided at more than two places, and a positioning ball 34 is provided on the inclined surfaces of the two ball seats 33a and 33b. Have been. One of the pair of ball seats 33a, 33b is urged toward the other ball seat 33a by a spring 35, and the positioning ball 34 is moved to the ball seats 33a, 33b.
It is urged radially outward by the inclined surface 3b.
The positioning sphere 34 is restricted by the holder 35 from protruding outward by a predetermined amount or more.

On the other hand, FIG. 5 shows a gas to which the ends of pipes 36 and 37 connected to the condenser lens driving gas supply pipe 29, the inert gas supply port 30 and the fume absorption port 31, respectively. FIG. 3 is a view showing a schematic configuration of a piping manifold, in which respective pipes 29, 36, and 37 are connected to a rotary bush 38 of the gas piping manifold. This rotary bush 38 and the three types of pipes 29, 36,
The rotary bush 38 and the optical system main body rotate coaxially, and a rotary bush manifold 39 which does not rotate is provided on the outer circumference of the rotary bush 38 which rotates. A condensing lens is provided on the inner peripheral surface of the rotary bush manifold 39. First annular groove 4 connected to a driving gas source
0, a second annular groove 41 connected to an inert gas supply,
And a third annular groove 42 connected to the fume suction device. Then, the first annular groove 40 communicates with the condenser lens driving gas supply pipe 29 via the hole 43 of the rotary bush 38, the second annular groove 41 communicates with the pipe 36 via the hole 44, and The third annular groove 42 communicates with the pipe 37 via the hole 45.

Thus, even when the optical system body rotates, each gas path is always connected to a gas source or the like via each annular groove, and a condenser lens driving gas or an inert gas is supplied through this gas pipe manifold. Is supplied to a predetermined location, and the fume sucked at the tip of the optical system passes through the pipe 37 and is discharged through the gas pipe manifold.

The outer cylinder 15 of the driving device 2 is
As shown in FIG. 6, it is connected to the fixing device 4 via the compliance device 50. A tubular body 52 is protruded from the substrate 51 of the fixing device 4 at a substantially central position thereof, and a connecting flange 53 is formed at the tip of the tubular body 52. The connection flange 53 and the outer cylinder 15 on the drive device 2 side are connected to each other via a plurality of compliance mechanisms 50.

FIG. 7 is an enlarged sectional view of the compliance mechanism 50. A connection shaft 54 with a head is inserted through the connection flange 53, and a sphere 55 fixed to the outer periphery of the connection shaft 54 is provided. The connection shaft 54 is engaged with a spherical seat 56 having a concave spherical surface provided on the connection flange 53.
Can be tilted to some extent. A spherical body 57 is screwed to the tip of the connecting shaft 54, and the spherical body 57 is engaged with a spherical seat 58 provided on the outer cylinder 15 on the driving device 2 side.
The connecting shaft 54 and the outer cylinder 15 can be relatively tilted to some extent. Further, a spring 59 is provided between a spring receiver 54a provided on the connection shaft 54 and the connection flange 53.
Are provided so that a certain degree of freedom can be obtained in the interval between the connecting flange 53 and the outer cylinder 15.

On the other hand, a plurality of laser cutting / welding device fixing openings 61 are provided at predetermined positions on the wall surface 3 at predetermined positions with respect to the pipe opening 60, and the fixing device 61 is mounted on the base 51 of the fixing device 4. The base 15 can be fixed to the wall surface 3 by inserting and mounting the pin 62 into the opening 61.

FIG. 8 is an enlarged sectional view of a fixing mechanism of the fixing device 4, and a fixing pin 62 with a flange is inserted and mounted on the base 51. A rotary shaft 63 is pivotally supported at the center of the flanged fixing pin 62, and a male screw portion 64 is formed at the tip of the rotary shaft 63, and a mover 65 is screwed to the male screw portion 64. . The proximal ends of links 66 and 67 are pivotally connected to the distal ends of the moving element 65 and the fixing pin 62 with a flange, respectively.
The tips of 67 are connected to each other by pins. The rotating shaft 63 is connected to an output shaft of a motor 69 via a coupling 68.

When the fixing pin with flange 62 is inserted into the opening 61 provided in the wall surface 3 in advance and the motor 69 is driven to rotate as described above, the rotating shaft 63 rotates and is screwed into the male screw portion 64. The moving element 65 moves to the tip side of the fixing pin 62 with the flange. Therefore, the two links 66 and 67, which have been extended substantially in a straight line, are folded as shown in FIG. 8, and the ends of the two links 66 and 67 are expanded outward, so that the opening 61 for fixing the laser cutting / welding apparatus is formed. Is engaged with the clamp groove 70 formed on the inner peripheral wall of the clamp groove 70, and the clamp groove 70 and the base 51 are firmly tightened and fixed by this engagement.

Therefore, the laser cutting and
When cutting or welding a pipe vertically attached to a wall surface by a welding device, a fixing pin with a flange 62 is inserted into an opening 61 for fixing a laser cutting / welding device formed on the wall surface 3, and both links 66. , 67 with clamp groove 70
The laser cutting / welding apparatus is fixed to the wall surface 3 by engaging with the wall.

Then, the laser drive optical system 1 is advanced by driving the first drive shaft motor 12 and inserted into the pipe opening 60. In this case, a spherical insertion head 23 is provided at the tip of the laser irradiation optical system 1 and a tapered expansion portion is formed at the open end of the pipe opening 60. Even when the center axis of the system does not coincide with the axis of the pipe opening 60, the axis of the laser irradiation optical system 1 and the pipe opening are slipped by the contact between the tapered expansion section and the insertion head 23 while sliding. The axis of 60 is aligned, and the laser irradiation optical system is smoothly guided and inserted into the pipe opening 60.

That is, as described above, when the insertion head 23 of the laser irradiation optical system 1 contacts the inner surface of the pipe opening 60 and slides on the inner surface, the laser cutting and welding device Since it is connected via the compliance mechanism 50, the insertion head 23 and the pipe opening 6 are connected.
The laser irradiation optical system 1 is freely tilted with respect to the cylindrical body 52 of the fixing device 4 in accordance with the sliding with respect to 0, and the axis of the laser irradiation optical system is gradually moved with respect to the axis of the pipe opening 60. Will be consistent.

As described above, when the laser irradiation optical system 1 is inserted into the pipe 71 (FIG. 1) provided in the wall, the positioning sphere 34 of the positioning device 32 is placed on the inner surface of the pipe 71. The center of the laser irradiation optical system and the center axis of the pipe are shifted within ± 1 mm.

When the laser irradiation port 24 of the laser irradiation optical system is positioned at a predetermined position in the pipe 71 to be cut or welded, the first and second drive shaft motors 12 and 1 are moved.
The laser irradiation optical system 1 is rotated around the axis by the operation of 4, and laser is irradiated from the laser irradiation port 24, so that the pipe 71 is cut or welded from its inner surface in the circumferential direction.

By the way, as shown in FIGS. 1 and 9, there is a case where the inside diameter of the pipe 71b near the opening of the wall of the pipe 71 in the wall is smaller than that of the pipe 71a provided in the wall. is there. Therefore, in this case, as shown in FIG. 9, for example, a groove A for welding or cutting pipes of the same diameter and a groove B for welding or the like for covering the pipe 71a at two places. May need to be done.

However, in this case, the condenser lens mounting cylinder 26 is supplied or discharged from the air or inert gas supply source to the cylinder 28 through the condenser lens driving gas supply pipe 29 into or out of the cylinder 28. The focus position of the laser beam can be changed by moving the condenser lens 21 back and forth through the intermediary, so that even if the inside diameter is different, the position adjustment of the condenser lens 21 enables reliable welding and cutting work. it can.

Further, when the inner surface of the pipe is welded, a considerable amount of fume or the like is generated. This fume is used for piping after welding,
When cooling water or the like is deposited on the surface of the optical system and flows into the pipe, the environment of the water deteriorates. In a general case, the post-weld treatment is to clean the pipe and use it as a cooling pipe after the weld inspection. In the present invention, the fume absorbing port 31 is provided at the tip of the nozzle cylinder 16 and the pipe 37 is provided. Is connected to the fume absorbing device via the fumes, so that fumes and the like are removed by suction at the same time as welding and cutting. Therefore, there is almost no need for a cleaning step. Also, when fumes are removed, the internal pressure of the pipe during welding is made slightly larger than the external pressure of the pipe, and the fumes are exhausted out of the pipe by the pressure difference. In addition, it is possible to perform welding or the like that is less likely to stain the piping.

In the above embodiment, the condenser lens mounting cylinder 26 is moved using the pressure of the inert gas,
Although the one that moves the position of the condenser lens 21 is shown, the condenser lens may be moved by a wire or the like. Also, a switch for confirming the fixed position may be provided in the fixing device, and it may be possible to confirm whether the laser cutting / welding device is mounted at a fixed position by turning on / off the switch.

[0042]

As described above, according to the present invention, a laser irradiation optical system having a positioning mechanism which can be inserted from a pipe opening on a wall surface side and has an axis aligned with the center axis of the pipe is provided.
Since the laser irradiation optical system is provided with a drive device for rotating the optical system around the axis and moving in the axial direction, and a fixing device for the wall surface, for example, for repair welding of a nuclear fusion reactor or a reactor internal structure, Cutting and welding of the inside of the pipe or the pipe can be easily performed by remote control. Furthermore, by making the condenser lens movable, welding and cutting can be performed from the inner surface of pipes with different inner diameters. By providing a fume suction port, fumes can be removed by suction and cleaning. The process can be omitted.

[Brief description of the drawings]

FIG. 1 is a view showing a schematic configuration of a laser cutting / welding apparatus for piping of the present invention.

FIG. 2 is a longitudinal sectional view of a drive unit in the device of the present invention.

FIG. 3 is a sectional view showing a schematic configuration of a laser irradiation optical system in the apparatus of the present invention.

FIG. 4 is an enlarged sectional view of a distal end portion of the optical system nozzle cylinder.

FIG. 5 is a diagram showing a schematic configuration of a gas pipe manifold unit.

FIG. 6 is a diagram showing a connection state of a fixing device and a driving device in the device of the present invention.

FIG. 7 is an enlarged sectional view of the compliance device.

FIG. 8 is an enlarged sectional view of a fixing mechanism of the fixing device.

FIG. 9 is an enlarged view of a portion A in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 laser irradiation optical system 2 driving device 3 wall surface 4 fixing device 5 driving shaft 6 spiral groove 7 spline groove 8 ball screw nut 9 spline nut 12 first drive shaft motor 14 second drive shaft motor 16 Nozzle cylinder 17 Laser transmission fiber 19 First lens 20 Second lens 21 Condensing lens 22 Polarizing mirror 23 Insertion head 26 Condensing lens mounting cylinder 28 Cylinder 29 Condensing lens driving gas supply pipe 30 Inert gas supply port 31 Fume absorption Mouth 32 Positioning device 34 Positioning ball 38 Rotary bush 39 Rotary bush manifold 50 Compliance device 54 Connecting shaft 60 Piping opening 61 Opening for fixing laser cutting / welding device 62 Fixing pin 63 Rotating shaft 65 Moving element 66, 67 Link 69 Motor 70 Kula Pump groove

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B23K 26/08 B23K 26/08 K 26/14 26/14 A G21B 1/00 G21B 1/00 Z (72 Inventor Eisuke Tada 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki Pref. Inside the Japan Atomic Energy Research Institute (72) Inventor Kiyoshi Oka 2-4 Shirakata-Shirane, Tokai-mura, Naka-gun Ibaraki Pref. Person Wataru Kono 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Keihin Works, Toshiba Corporation (72) Inventor Seichiro Kimura 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Keihin Works, Toshiba ( 72) Inventor Yoshinobu Makino 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Keihin Works Co., Ltd. (72) Inventor Katsunori Shiihara End of Tsurumi-ku, Yokohama-shi, Kanagawa 2-4 Cho-cho, Toshiba Keihin Works Co., Ltd. (72) Inventor Nami Sasaki 1-1-1, Shibaura, Minato-ku, Tokyo Inside Toshiba Corporation Head Office (72) Inventor Tetsuro Nishimura Harumi, Fuchu-shi, Tokyo 2-24-24, Toshiba F-System Engineering Co., Ltd. F-term (reference) 4E068 AE00 BG02 CA06 CA11 CD08 CD15 CE02 CE08 CG02 DA15

Claims (7)

[Claims] 1. A laser cutting / welding apparatus for a pipe for laser-cutting / welding a pipe vertically mounted on a wall from an inner surface thereof, the pipe can be inserted from a pipe opening on a wall, and an axis coincides with a central axis of the pipe. A piping, comprising: a laser irradiation optical system provided with a positioning mechanism; a driving device that rotates the laser irradiation optical system around an axis and moves in the axial direction; and a fixing device to the wall surface. Laser cutting and welding equipment. 2. The positioning mechanism according to claim 1, wherein the positioning mechanism has a plurality of positioning spheres which are arranged in a circumferential direction on an outer cylinder of the laser irradiation optical system and which are resiliently projected outward in a radial direction. Laser cutting and welding equipment for piping. 3. The device according to claim 1, wherein the driving device is mounted on the base of the fixing device so as to be able to move and tilt to a certain extent in the axial direction by a compliance mechanism.
The laser cutting / welding apparatus for piping according to claim 1. 4. An optical system for laser irradiation is provided in a nozzle cylinder, and an optical fiber for transmitting a laser beam emitted from a laser oscillator, and at least one optical fiber for parallelizing the laser beam emitted from the optical fiber. A lens, a condenser lens for condensing the laser light emitted from the lens, and a mirror for changing the laser light emitted from the condenser lens in a radial direction, wherein the condenser lens is a laser irradiation optical 2. The laser cutting / welding apparatus for piping according to claim 1, wherein the apparatus is mounted on the nozzle cylinder so as to be adjustable in the axial direction of the system. 5. A suction device, wherein a fume suction port is opened at the tip of the laser irradiation optical system, and the fume suction port is provided outside the apparatus through a pipe provided along the laser irradiation optical system. The laser cutting / welding apparatus for piping according to claim 1, wherein the apparatus is connected to a pipe. 6. The fixing device has a fixing pin inserted into two or more holes provided in advance on the wall surface, and a distal end of the fixing pin is capable of moving forward and backward in a radial direction, and 2. The laser cutting / welding apparatus for piping according to claim 1, wherein an engagement piece is provided which engages with a clamp groove formed on an inner peripheral surface of the hole when the hole advances. 7. A rotary shaft is disposed concentrically on the fixed pin, and a first link is pivotally connected to a movable member screwed to a threaded portion at the tip of the rotary shaft. Is pivotally attached to the tip of a second link pivotally attached to the tip of the fixed pin, and the rotation of the rotating shaft allows the first and second links to advance and retreat in the radial direction via the mover. 7. The laser cutting / welding apparatus for piping according to claim 6, wherein: