KR100913793B1 - Welding system and method using laser beam - Google Patents

Abstract

According to the laser beam welding system and welding method of the present invention, it can be used for welding a metal thin plate, and a laser such as Nd: YAG, CO 2 or a diode laser can be used. In addition, the laser may be a continuous wave (CW) or pulsed (plused type). The present invention provides for expensive seam tracking or line following to compensate for other consequences of moving parts, such as tooling tolerances, stamping tolerances and rotation under welding means. ) Can reduce or eliminate the need. The present invention enables high quality symmetrical welding on sheet materials and reduces the attention required by the operator. In addition, the welding method according to the present invention can be applied to other materials. Because of the nature of the beam distribution system, the spatial shape of the laser beam does not significantly affect the weld quality of the finished product. The invention can be applied to weld the inner and outer diameters of a welded metal bellows.

Welding device, welding method, laser beam, welding metal bellows, inner diameter welding, outer diameter welding

Description

Laser beam welding system and welding method {Welding system and method using laser beam}

1 is a block diagram showing an inner diameter welding apparatus according to the laser beam welding system of the present invention.

Figure 2 is a schematic view showing a rotary rim plate that is a clamp fixture for welding the inner diameter according to the present invention.

Figure 3 is a block diagram showing an inner diameter welding thin plate supply apparatus according to the present invention.

Figure 4 is an explanatory diagram for explaining the irradiation process and principle of the laser beam according to the present invention.

Figure 6 is a block diagram showing an outer diameter welding apparatus according to the laser beam welding system of the present invention.

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Figure 7a is a block diagram showing a welding ring used in the outer diameter welding apparatus according to the present invention.

FIG. 7B is a cross sectional view along line A-A in FIG. 7A;

8 is an explanatory view schematically showing an outer diameter welding method according to the present invention.

9A and 9B are explanatory views showing a laser beam irradiation method of outer diameter welding according to the present invention;

10 is a block diagram showing the formation of a weld bead according to the present invention.

11A and 11B are diagrams each showing a welding form according to the prior art and a welding form according to the present invention;

12 is a configuration diagram showing a state where the male and female thin plates are misaligned.

* Description of the symbols for the main parts of the drawings *

1: male lamination 2: female lamination

10: laser beam generator 11: laser beam

11 ': position shifted laser beam 11a, 11b: upper and lower laser beams

20: laser beam energy supply 30: spectroscopic lens

41: upper slide table 42: lower linear slide table

43: head crank 50, 51, 52: reflector

65: Welding nozzle 60. 61, 62: Focus lens

80: monitor 91: upper swivel plate

92: lower swivel plate 93: DC motor

111: solenoid valve 122: vacuum cup

124: air cylinder 130: host computer

100: control unit 140: welding ring

202: upper container 203: side container

204: height adjustment screw 211: reinforcement clip

The present invention relates to a laser beam welding system and a welding method, in particular to produce a perfectly symmetric weld bead using a laser beam, to deepen the depth of penetration, and to manually control the welding line through a microscope It enables welding without the need of automatic seam tracking, which is automatically searched for, and requires no delicate alignment or maintenance, and is not sensitive to minute vibrations or temperature differences so that anyone can easily weld. The present invention relates to a laser beam welding system and a welding method.

In general, welded metal bellows production is widely used throughout the industry, such as missile fuel injection, aircraft, semiconductor production, high pressure and high temperature chemical refinery processes, vacuum valves, and mechanical seals. It was a labor-intensive industry that was only possible by skilled personnel.

The welded metal bellows produces circular female and male discs (diaphragm) by diaphragm stamping, which bends and cuts a thin metal sheet of about 0.1 mm, and overlaps the inner and outer diameters. Weld to create flexible metal bellows.

Tungsten inert gas (TIG: Tungsten-Inert-Gas), plasma, electron beam, MIG, GTAW, etc. are used as a heat source that is conventionally used for micro fusion. Among these, TIG welding torch is most used.

This conventional welding method overlaps the female and male diaphragms, inserts a chill ring between them, welds the inner diameter to create a single convolution, and then re-threads them to weld the outer diameter. In welding, the operator must keep the distance between the welding torch tip and the welding part constant through the microscope while the welding is in progress, and also control to follow the welding line accurately. When this is over, it's a difficult task that requires a fairly skilled skill to move on to the next and continue the work over and over.

As described above, the conventional welding method has a low welding speed, severe thermal damage to the welded part, high fatigue of the operator, and quality of the product is determined according to the skill of the welder, thereby making it difficult to maintain uniformity of quality. In addition, the automation of the process is very difficult, the welding speed is also about 10-12 inches per minute in the case of 0.2mm thick material with two sheets of thin plate, 60 minutes 4 inch diameter welding takes about one hour, Unskilled workers need more time.

During the welding process, the operator must keep track of the welding line through the microscope at all times, and argon, which is a welding gas to prevent oxidation, flows into the welding area during the welding process, which causes a health problem of oxygen deficiency for the worker. There is a problem.                         

In the past few years, laser bellows welding has been attempted between laser producers and bellows producers, but they are still in primitive or limited production. I have a problem. For example, no matter how precisely a tool such as an arbor or a clamp for welding is produced, due to the accumulation of mechanical errors, the welding line has to move from side to side or back and forth, and special sensors and devices are used to track them. Even though a perfect automatic seam tracking system is achieved by using, the critical problem of asymmetry is that the weld bead is not exactly positioned at the center of the material due to the characteristics of the laser.

One of the advantages of using a laser for this particular welding is the extremely small size of the laser beam and the high density of integrated energy. Focused laser beams have a diameter of about 0.1-0.2 mm and a power density of about 3-4 Mwatt / cm ² , which generates energy that is so high that it is incomparable to the TIG method. By enabling the melting, the welding speed can be about 10 times faster than the TIG, and the life is greatly improved due to the deep penetration and less heat damage around the welding. However, due to the characteristics of the laser beam, it is thought that the center of the beam should have the highest energy, but in practice, the hot spot moves its position at all times according to the change of the optical component or output power. Since the laser beam is always in the center of the two objects to be welded, the actual melting occurs to the left and right, which causes a problem in the quality of the product.

US Pat. No. 6.040,550 introduces a device which automatically finds a welding line through a special vision sensor and an optical device, and constantly irradiates a laser beam at the center of the moving welding line. Problems occur easily due to temperature change or RFI (Radio Frequency Interference) generated from the laser system, which makes alignment misaligned, device design and maintenance difficult, and asymmetric welding beads mentioned above. .

In addition, in US Patent No. 6,078,021, a welding method using a laser beam and an electron beam has been introduced. When the beam is tilted and irradiated only in one corner direction of the welded part, there is a problem in that the symmetrical beads are not formed and thus the quality is deteriorated. , U.S. Patent Nos. 5,478,983 and 5,410,123 describe an inner diameter and an outer diameter welding using a rectangular beam, but there is a problem that a problem may occur due to one-way irradiation.

Accordingly, the present invention has been made to solve the above problems, the present invention uses a laser beam to create a perfectly symmetrical weld bead, deepen the depth of penetration, the operator manually controls the welding line through a microscope, or automatically Lasers enable welding without the need for automatic seam tracking, no delicate alignment or maintenance, and no sensitivity to minute vibrations or temperature differences, making lasers easy to weld It is an object of the present invention to provide a beam welding system and method.

According to the present invention for achieving the above object, a laser beam generator for generating a laser; One or more reflectors for reflecting the laser; Reflector vibration means for angularly changing the reflector at high speed such that the reflecting angle of the laser is repeatedly changed in a predetermined range; A welded object which is irradiated and welded in the form of a line while being angularly changed at high speed by the reflector vibration means; A focus lens for focusing the laser with the weldment; Clamping means for clamping the weldment; And it provides a laser beam welding system comprising a central control unit for observing and controlling the welding process.

In addition, the present invention is located in a sealed space in which the weld is sealed from the outside, the shield gas providing unit for injecting a shield gas into the sealed space to prevent oxidation during welding; Monitoring means for monitoring and displaying a state of welding the weld by the laser; Position and distance adjusting means for adjusting an initial position and a focal length of the laser beam while viewing the image displayed by the monitoring means; Weldment moving means for moving the weldment to a welding position and moving the welded weldment; And a laser beam branching means provided at the front of the laser beam generator, for branching and reflecting the laser beam irradiated from the laser beam generator in two directions to irradiate and weld the weldment in both directions.

In addition, the present invention comprises a laser beam irradiation step of irradiating a laser beam; A reflection step of reflecting the irradiated laser beam at a predetermined angle using a reflector; A focus setting step of focusing on a welded portion of the welded object of the reflected laser beam; And each change step of repeatedly changing the angle of the reflector in a predetermined range at a high speed in the focused state of the laser beam to irradiate the laser beam in the form of a line.

The present invention relates to a laser beam welding system and method including an inner diameter welding device for welding an inner diameter and an outer diameter welding device for welding an outer diameter, and welding a metal bellows using a laser.

In addition, in the present invention, both the inner diameter welding and the outer diameter welding scan the laser beam at a constant width and in the form of a line instead of the beam at a point falling at a speed of 2-4 KHz, thereby simultaneously distributing the hot spots of the laser beam on the welded portion. Even if the welding line moves to the left or right, the welding proceeds smoothly when it enters the scanning line.

In the case of the inner diameter welding, the laser beam is divided into two and scanned at a 45 degree angle, respectively, and synthesized at the welded portion so that the energy from the welded portion is scanned on the side of the welded portion, and the outer diameter welding can be used in the same way. In this case, the laser beam is irradiated perpendicularly to the welded portion without dividing the laser beam, and the energy of the laser beam is reflected on the edge wall of the 45 degree angle of the surrounding welding ring and is scanned on the side of the welded portion.

The present invention has the advantage that the melting proceeds quickly and effectively by welding the side surfaces at the same time, rather than the melting proceeds only in the upper portion of the welding line to achieve the desired penetration depth during welding, the penetration is deep.

The present invention reduces problems such as contamination of personnel and parts by automating loading / unloading of parts.

In addition, the present invention, the inner diameter welding is preceded in the state of overlapping the male and female thin plate, the female thin plate is placed on the inside of the rotary bite lower plate, when the male thin plate is inverted and placed on it, the rotary bite plate to the force of the compressed air It comes down and asks for two overlapping sheets.

The rotary chuck starts to rotate at a desired constant speed by a DC motor, and the inner diameter welding device uses a spectroscopic prism to split the laser beam into two parts of 50:50. Each spectroscopic laser beam passes through the prism, scanning mirror and focusing lens to the welding area, and the two upper and lower reflectors mounted on the resonant scanner shake the laser beam in the form of a line in the form of a line. When the vacuum scanner is stopped, the laser beam is adjusted to be positioned at the edge of the welded part. While the welding is performed, the two reflectors vibrate at high speed, and thus, the laser beam scanned by the welding line crosses the welding line and returns to the high speed to have the effect of being scanned in the form of a line.

Further, in the present invention, after the scanning line is reflected by the surface of the reflector and passes through the focus lens, the focus is reached, and when the reflector is rotated and moved by an angle of θ1, the reflected beam moves by θ2, and the angular movement at this time The angle has a ratio of 2 θ1 = θ2. At this time, the scan point readjusted by the rotation angle of the reflector has a certain distance from the position before the movement, and if the reflector rotates in the opposite direction and moves by -θ1, the movement distance is also equal to the movement distance at the first half-wave rotation. If such shaking is continued at a high speed, the laser beam to be scanned is represented in the form of lines instead of one point.

When using this scanning method, the energy is distributed evenly on the scanning line, which can solve the problem of asymmetric welding bead that appears as the hot spot of the laser beam is constantly changing. The conventional manual welding method, which requires manual observation through a microscope and traces the welding line, or expensive automatic welding line tracking device, is also unnecessary, and the melting is quick and effective by reflecting the beam off the welding line to the side of the welding part. Has the advantage.

This scanning method can be applied to the inner diameter and the outer diameter differently. Especially, in the case of outer diameter welding, even if the laser beam is scanned perpendicularly to the welding line, the welding chiller is inserted according to the design of the weld chill ring inserted during the outer diameter welding. The laser beam can have the same effect by the 45 degree edge of the ring.

The present invention has developed a technique for welding metal bellows using a laser, in which melting occurs evenly on the welded portion using an oscillating beam technique. This allows the welding area to be perfectly symmetric in the center of the two materials without being biased in one direction, and reflects the beam that is scanned out of the welding area to be scanned on the left and right sides of the object to enable faster and more complete melting. It is a laser beam welding apparatus and method that enables the production of fast and perfect edge welded bellows without the tracking of welding seams.

The present invention includes the design of inner and outer diameter welding devices and weld rings and sheet feeders.

Types of lasers used as heat sources include Nd: YAG, Nd: Glass, Nd: YNO, CO, CO2, Cr: Ruby, Diod Lasers, Diode Pumped Lasers, etc. CW can be used for both continuous wave and pulsed operation.

According to the laser beam welding system and welding method of the present invention, it can be used for welding a metal thin plate. The present invention may use a laser such as Nd: YAG, CO 2 or a diode laser. In addition, the laser may be a continuous wave (CW) or pulsed (plused type). The present invention provides for expensive seam tracking or line following to compensate for other consequences of moving parts, such as tooling tolerances, stamping tolerances and rotation under welding means. ) Can reduce or eliminate the need. The present invention enables high quality symmetrical welding on sheet materials and reduces the attention required by the operator. The method can also be applied to other materials. Because of the nature of the beam distribution system, the spatial shape of the laser beam does not significantly affect the weld quality of the finished product. The invention can be applied to weld the inner and outer diameters of a welded metal bellows.

The above and other objects, features and advantages of the present invention can be more clearly understood from the following detailed description with reference to the accompanying drawings.

Laser beam welding system according to a preferred embodiment of the present invention, in the manner of using a laser to weld a circular disk (i.e. diaphragm) made of a thin metal sheet material, the laser beam melts the two abutting materials By dropping the laser beam at predetermined intervals, it is possible to weld a material wider than the size of the laser beam, and consists of an inner diameter welding device and an outer diameter welding device.

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Hereinafter, an inner diameter welding device constituting the laser beam welding system of the present invention will be described with reference to FIG.

1 is a block diagram showing an inner diameter welding apparatus according to the laser beam welding system of the present invention.

As shown in Fig. 1, the inner diameter welding device constituting the laser beam welding system of the present invention comprises: a laser beam generator 10 for generating a laser beam 11; A laser beam energy supplier 20 for supplying energy to the laser beam generator 10; The laser beam 11 generated from the laser beam generator 10 is 50:50 divided into two upper and lower laser beams 11a and 11b, that is, the upper laser beam 11a is identical from the laser beam generator 10. In a straight line, the lower laser beam 21b includes a spectroscopic lens 30 to be divided at right angles to the laser beam generator 10; A spectroscopic prism 40 for irradiating the lower laser beam 11b, which is bent at 90 degrees by the spectroscopic lens 30, in parallel with the upper laser beam 11a; A reflector (51) (52) for reflecting the upper and lower laser beams (11a) (11b) at a predetermined angle with a welding portion to be welded, that is, a welding line, respectively, and having a variable reflection angle; A focus lens (61) (62) for focusing the upper and lower laser beams (11a) (11b) reflected from the reflectors (51) (52) to the welding site; A CCTV camera 70 passing through the focus lenses 61 and 62 and enlarging a welded portion to capture an image thereof to adjust an initial position and a focal length; A TV monitor (80) for displaying an image captured by the CCTV camera (70); When welding is performed by the upper and lower laser beams 11a and 11b, the male and female plates (male and female diaphragms) 1 and 2 to be welded are operated by compressed air to press a predetermined pressure on the upper and lower sides. Upper and lower rotary chucks 91 and 92 which are clamp means which are rotated at the same time (see FIG. 2); And a DC motor 93 which provides a power source to rotate the upper and lower rotary chucks 91 and 92 at a constant speed. And a controller 100 for controlling the DC motor 93. Reference numerals 41 and 42 are the upper slide table and the lower slide table, respectively.

In addition, a shield gas providing unit 110 is included to enable an effective shield by providing and filling gas in the welding part. The solenoid valve 111 is provided in the connection line connected to the shield gas providing unit 110 to provide the shield gas to the welding site.

In addition, the inside of the inner diameter welding device is to block the air, a plurality of robot arm (120) for inserting the parts to be welded and picked up the convolution (convolution) is provided, and the like A host computer 130 for watching the progress. The reflectors 51 and 52 are provided in the resonance scanner.

The host computer 130 is connected to and controlled by the laser beam energy supply 20, the control unit 100, and the solenoid valve 111. The apparatus further includes position and distance adjusting means for adjusting an initial position and a focal length of the laser beam while viewing the image displayed by the monitor 80.

Here, the robot arm 120, the rotary stage (not shown) controlled by the stepper motor (stepper motor) (121) to insert the thin plate (1) (2), the work to pick up after welding Precise control.

The robot arm 120 is composed of a plurality of preferably three, the sucker 122 is mounted at the end thereof, it is operated by a vacuum pump (not shown). It is precisely operated by the host computer 130 and is connected to a vacuum pump and a vacuum storage tank (not shown) connected thereto for this purpose.

The upper and lower rotary chucks 91 and 92 are opened and closed to clamp the thin plates by an air cylinder 124 operated by compressed air, and the pressure of the rotary chuck is adjusted by the applied air pressure. do.

Figure 2 shows the configuration of the upper and lower rotary chuck plate configured to the inner diameter welding device for clamping the female watermelon plate.

The inside of the upper and lower rotary rim plates 91 and 92 on which the bent arms and watermelon plates 1 and 2 are placed on both ends are formed to have a surface like a bend of the thin plate. The reason for giving such a bend is that the thin plates 1 and 2 are automatically positioned in the center.

In addition, the inner wall diameter of the lower rotary rim plate 92 is the same as the outer diameter of the thin plate dropping the thin plate brought by the robot arm 130 is placed in the correct position.

Therefore, the shape of the upper and lower rotary chuck 92 helps the function of the robot arm 120 to position the female watermelon plate (1) (2) on the rotary chuck plate (91) 92 to lower the required precision The work becomes easier, and the processing tolerance of the conventional technique is +/- 0.01mm, but the tolerance is about 0.1mm if the above method is accommodated.

In addition, the material of the thin plate biting portion of the rotary chuck prevents excessive overheating by using a material having high thermal conductivity, thereby preventing thermal damage of the thin plate and contributing to improving product quality.

The CCTV camera 70 and the monitor 80 as a monitoring means for monitoring the welding state, it is preferable that the CCTV camera 70 has a 40-100 magnification, the CCTV camera 70 is the initial reflector 51 It is used to precisely move the 52 to control the laser beams 11a and 11b to be exactly positioned at the edges of the welding line, and observe the situation where the welding proceeds.

In other words, the welding means passing through the focus lens 61 and 62 can be observed during the welding process using the monitoring means, and the enlarged image is shown on the TV monitor 80 so that the reflector 51 ( The initial control of 52 and the focal length control of the focus lenses 61 and 62 are facilitated.

Here, a crosshair is displayed at the center of the TV monitor 80, which indicates that the laser is emitted and is adjusted to coincide with the weld line.

The host computer 130 in charge of the overall control of the inner diameter welding device is responsible for the speed of the switch or motor of each device, the opening and closing of the laser and energy control, and the status of each part.

On the other hand, Figure 3 is a block diagram showing a thin plate supply apparatus for inner diameter welding constituting the inner diameter welding apparatus according to the present invention.

0.1 mm thick thin plate (1) (2), which is decontaminated by washing and drying, is stored in a container that is separately sealed between the female and male, and the container is fixed at a position where the robot arm 120 can pick up. As shown in Fig. 3, each container is composed of a sensor that automatically reads the presence or absence of the thin plates 1 and 2 and the position of the uppermost portion, and a device for constantly pushing up the position of the upper portion.

Here, reference numeral 201 is a bellows diaphragm stack, 202 is a container top, 203 is a container side, 204 is a diaphragm stack height adjusting screw, 205 Diaphragm moving platform, 206 is height adjustment nut, 207 is reduction gear, 208 is motor mounting platform, 209 is lower seal plate 210, Worktable lower surface, 211 Spring retainer clip, 213 Retainer bracket, 214 Diaphragm platform spacer block, 215 DC motor 216 is the lower mounting platform, 217 is the guide bearing, 218 is the upper screw bearing, 219 is the lower screw bearing screw bearing).

In the inner diameter welding sheet supply device configured as described above, the thin plates before washing and drying welding are stored in an airtight container, and the container is an arm and watermelon pickup position under the robot arm 130 of the inner diameter welding device. It will be fixed at.

This container has several functions. Each male and female is stored in a different container, and easily fixed by a spring reinforcing clip 211, and the reinforcing clip 211 is fixed to reclose the thin container under the sealed inner diameter weld table. Inside, the operation of removing the oxygen in the inner diameter welding portion and injecting the shield gas is performed at the same time. The sheet is 0.001 inches thick and 1000 sheets stacked, but only four inches tall. Three containers for receiving male, female and welded convolutions are fixed under the table, and inside the thin plate container there is a stacking height adjusting screw 204 operated by a motor 215 to dedicate the thin plate. It serves to push up the platform 205.

This function is to ensure that the robot arm 130 can suck up the sheet without problems by always pushing the top of the stored sheet to the desired position, and if the top sheet is lifted, the sensor of the container will change its position. I grasp it and push it up by the missing thickness and prepare for the next work. After the last sheet is lifted, the sensor will signal the computer to complete the task, and one container will store more than four hours of work.

The three robot arms 130 simultaneously lift the arm and the watermelon and the welded convex line at an angle of 90 degrees and rotate the 90 degrees so that the welded convex line is placed in the third container and the arm thin plate is placed in the rotary chuck. . Then, rotate the plate 90 degrees further and place the watermelon plate and rotate it by -270 degrees so that the robot arm escapes from the weld.

The irradiation process and principle of the laser beam of the laser beam welding system of the present invention configured as described above will be described with reference to FIG. This investigation process and principle is applied to the inner diameter welding apparatus described above, and similarly applied to the outer diameter welding apparatus described later.

4 is an explanatory diagram showing the process and principle of the laser beam according to the present invention, in which the laser beam 11 is scanned on the welding portion Fs during the reciprocating motion by the reflectors 61 and 62; It shows the shape of the beam.

The scanning line indicated by the solid line 11 in the drawing is reflected by the reflecting mirrors 51 and 52 and passes through the focal lenses 61 and 62 to reach the focal plane Fs. At this time, when the reflectors 51, 52 rotate and change by an angle of θ1, the laser beam 11 'reflected by the reflectors 51, 52 moves by θ2, and the angle of movement at this time is Is 2θ1 It has a ratio of = θ2 _.

At this time, the focal point F ′ changed by the rotation angle of the reflectors 51 and 52 has a certain distance from the focal point F before the movement, and the reflectors 51 and 52 rotate in the opposite direction to each other by -θ1. If it moves in reverse, the movement distance is also equal to the movement distance at the first half-wave rotation. If such vibration is continued at a high speed, that is, if the angle change of the reflectors 51 and 52 is continued at a high speed, the laser beam 11 to be scanned appears in the form of a line rather than a point.

When using this type of scanning method, the energy is distributed evenly on the scanning line, so that the hot spot of the laser beam is constantly changed, and the width of the scanning line can be solved. Even if this movement is a little, there is no problem in welding, and it compensates the conventional disadvantage of manually observing through the microscope and tracking the welding line, and it is not necessary to have an expensive automatic welding line tracking device, and also reflects the beam off the welding line to the side of the welding part. Melting is fast, effective and deeply infiltrated.

By the irradiation method, the laser beam 11 is reflected on the surfaces of the reflecting mirrors 51 'and 52' which are moved by a predetermined shaking angle from the state where the shaking of the reflecting mirror is stopped, and the reflecting mirrors 51 and 52 are reflected. The laser beam passes through the center of the focus lens 61 and 62 and the focal plane F is focused on the focal plane Fs by moving the angle of the reflector while the movement of the beam is stopped. The laser beam 11 passing through the focus lenses 61 and 62 moves at an angle of θ1 from the center when it is moved by θ1 from the center to one side by half of the total angle of movement of the controlled reflector.

Therefore, the laser beam irradiated on the focal length also moves a certain distance from the center, and even when the reflectors 51 and 52 are moved by θ1 from the center, the same phenomenon occurs on the opposite side so that the irradiated beam is not one point. Appears. The area of the line shape to be irradiated can be changed by adjusting the angle of movement of the reflector (51, 52).

Referring to the laser beam irradiation process and principle as described above, the operation of the inner diameter welding device constituting the laser beam welding system of the present invention will be described.

First, determine whether there are any parts left in the container in which each part is mounted, whether the welding is finished and the clamp, that is, the rotary chuck 91, is lifted up, and then turn the robot arm 120 by 90 degrees. ), The arm and watermelon are placed on the container, and then the robot arm 120 is lowered again to open all three sucker suction switches, and then lifts the robot arm 120 and rotates another 90 degrees. And lower, dropping the welded parts and diaphragms.

Then, the robot arm 120 is raised again and rotated 90 degrees further, the robot arm 120 is lowered to drop the watermelon plate, and the robot arm 120 is rotated by -270 degrees to undergo the procedure of the original position and the like. Next, when the welded part comes out and the material to be welded is located, lower the upper rotary chuck 91 to start the rotation while pressing the two or two thin plates, and open the shield gas switch to flow the gas. Then, the laser is turned on for the correct time to perform a series of operations such as welding.

This job is controlled by the host computer 130, and the name of the worker, the start time of the work, the work content (part name, the number of work, etc.) are recorded.

When the female thin plate 2 is placed on the lower rotary plate 92 and the watermelon plate 1 is turned over and placed on the female thin plate 2, the upper rotary plate 91 is driven by the force of the compression cylinder. It comes down and asks the two overlapping thin plates (1) and (2), and the upper and lower rotary chucks 91 and 92 are rotated at a predetermined speed by the DC motor (93).

In this state, the laser beam 11 irradiated from the laser beam generator 10 is divided into two branches by the spectroscopic lens 30, and the two divided laser beams 11a and 11b are directed toward the welding site. Investigate from above and below (see FIGS. 5A and 5B).

Subsequently, the branched laser beam 11b divided by the spectroscopic lens 30 is bent by 90 degrees by the prism 40 and irradiated in parallel with the branched laser beam 11a, and the reflecting mirror 51 The laser beams 11a and 11b irradiated in the state in which the 52 is not shaken are passed through the centers of the focus lenses 61 and 62, and are synthesized at the corners of the welded portion.

Then, in the state where the laser beam is focused, the upper and lower rotary chucks 91 and 92, which are operated by the compression cylinder while the welding is in progress, move the two female and watermelon plates 1 and 2 to an appropriate pressure. The two thin plate edges are melted and welded by the laser beams 11a and 11b which are pressed and turned.

As described above, the inner diameter welding is performed by dividing the laser beam 11 into two parts using the spectroscopic lens 30 into the upper and lower laser beams 11a and 11b, respectively. ) And the reflecting mirrors 51 and 52 and the focusing lens 61 and 62 to reach the welding site. At this time, the two reflectors 51 and 52 are irradiated with the laser beam in the form of a line while shaking at a fixed frequency.

The appearance of the welding line and the shape of the laser beam irradiated by the inner diameter welding apparatus will be described in more detail with reference to FIGS. 5A and 5B. 5A and 5B are explanatory views showing the laser beam irradiation method of the inner diameter welding according to the present invention.

In the initial control, as shown in FIG. 5A, the reflectors 51 and 52 are fixed to the center of the shake while the shaking of the reflectors 51 and 52 is stopped, and at this time, the focus lenses 61 and 62 pass through the focus lens 61 and 62. The laser beams 11a and 11b are controlled to be positioned at the edges (sides) of the welded portions. After the position of the laser beam is controlled, the laser beam 11 irradiated by the reflecting mirrors 51 and 52 that floats at high speed during welding is sufficiently overlapped at the welded portion, thereby allowing complete melting.

That is, as shown in Fig. 5A, the laser beam is controlled to be positioned at the edge of the welded portion in the state where the reflectors 51 and 52 are stopped. While the welding is performed, the two reflectors 51 and 52 vibrate at a high speed. As a result, the laser beam scanned at the welding portion crosses the welding line and returns to the high speed to produce the effect of scanning in the form of a line. Indicates.

The laser used in the inner diameter welding apparatus can be used as long as the laser generates enough energy to melt the material. For example, Nd: YAG, Nd: Glass, Nd: YVO, CO, CO2, Cr: Ruby, Diod, Diod Pumped, and the like can be used.

In addition, there are several requirements for the laser system to be used, for example, the power (power), shutter (shutter), interlock (interlock), etc. to be controlled by the host computer.

Here, the control of the computer may be performed manually for final adjustment of each part of the device, such as opening and closing of the upper and lower rotary chucks, rotation speed of the rotary chucks, laser on / off, robot arm movement, and the like. .

In addition, the progress time of the inner diameter welding is different depending on the diameter of the sheet, but usually one every 10-30 seconds. This is because the welding speed can be as high as 40-120 inches / minute, depending on the material and thickness. The welding speed can be about 10 times higher than that of conventional TIG with a maximum welding speed of 12 inches / minute.

Further, in the inner diameter welding apparatus, a fine thin plate is supplied to the rotary chuck by a robot arm, and the welded convolution is also taken out by the robot arm. For this purpose, a stepper motor, a rotary table, an air cylinder, three robot arms, vacuum cups, a high vacuum pump, a solenoid air valve switch ( solenoid air velve switches) are used.

The inner diameter welding device of the laser beam welding system according to the present invention has the following effects.

First, the inner diameter welding apparatus according to the present invention is sealed inside, thereby protecting various optical devices, that is, focus lenses, reflectors, prisms, spectroscopic lenses, and laser rods from contamination such as dust. In addition, by removing the oxygen inside and injecting shield gas (argon) to prevent oxidation during welding, by keeping the pressure inside the sealed weld higher than the atmosphere to prevent the inflow of oxygen or contaminants from the outside. Therefore, a clean room of class 1000, which is an environment for bellows welding, becomes unnecessary.

In addition, as the welding work is performed in the enclosed space, the safety of the worker is guaranteed from the laser beam, and the work of the parts is performed by the robot arm instead of the worker, thereby reducing the error or contamination of the worker. Compared to the conventional method of continuously flowing the oxidation shielding gas at all times, it is unnecessary to use any gas other than the gas injected into the sealed space during the welding process, and it is possible to reuse the gas collected through the filter after welding. Brings savings. In terms of worker safety, it is also helpful for the prevention of safety accidents in which workers inhale gas such as argon and are caused by oxygen deficiency.

Second, when welding the inner diameter by dividing the laser beam in two and up and down in both directions to compensate for the problem of one-way irradiation, by scanning the reflector in the form of a drop line at high speed has an excellent effect than using a rectangular beam. Due to this, in the case of inner diameter welding, the optical device for irradiating a laser beam should be included in the inner diameter, so that the optical equipment can be relatively far from the welding area, and thus the life is long, and the diameter of the thin plate inner diameter is increased. Even small parts can be welded.

In addition, even if the size of the thin plate is changed because the optical devices are installed far away, it is very easy to replace the swivel rotation plate and re-control of the optical devices. In this case, the size and symmetrical shape of the weld bead can be easily adjusted by the position of the two beams, and the irradiation lines that are out of the weld zone are reflected on the wall of the rotary stopper and applied to the side of the weld zone. .

Third, the laser beam must be dropped in order to completely cover the thickness of the material and the part where the welding line moves left and right due to the accumulation of machining tolerances without the weldability tracking device. The width of the scan line is determined by the floating angle, and in general, it is controlled to move about 3-4 times the thickness of the welding material. By irradiating the laser beam in this way, it is possible to process an object wider than the diameter of the laser beam, and it is possible to reliably weld even if the seam is slightly different in height and width.

Fourth, the initial control and alignment is very easy when changing from one bellow work to another. About 10-15 minutes by pressing and pulling the upper and lower rotary chuck 91, 92 (see Fig. 2) from the bearing without special tools, and moving the previous stage carrying the upper and lower optics, the laser beam is the edge of the new thin plate. This can be done easily with two tasks that control the survey.

Fifth, it is possible to prevent the contamination of the washed thin plate, to reduce the problems caused by the error of the operator, the automated device is unnecessary the worker's full time. In addition, the cost is reduced because no skilled workers are required, and the cleaned thin plates are stored together with the shield gas in a sealed container, and are used by inserting them into the sealed welding part, and the inside of the welding part is filled with shielding gas for preventing oxidation. The unused thin plate is also stored in such a sealed container together with the shield gas to prevent natural oxidation by oxygen in the air.

Sixth, the task of manually dividing the thin plate into female and male parts takes a considerable time, and at this time, it is necessary to wear special gloves and to deal with the thin plate while being concerned about contamination.

Seventh, divide the laser beam into two and recombine it at the welding part, and solve the problem that various foreign substances generated during welding contaminate the focus lens or reflector because the optical device can be far from the welding part, Easy maintenance such as replacement of parts, and easy control of welding bead by controlling up and down laser beam separately.

Eighth, the energy out of the welded portion of the laser beam to be irradiated is reflected by the wall surface of the rotary rim plate to irradiate the side surface of the welded portion, the melting is fast and deep penetration, so the product quality is greatly improved.

Ninth, use the CCTV camera to enlarge the weld to view the image on the monitor, and use it to control the exact focal length and position of the laser beam, and use the resonant scanner to shake the reflector at high speed so that it is not one point. It can be injected in the form, and it is easy to replace the swivel plate to minimize the device control according to the replacement of the work parts.

Next, the outer diameter welding apparatus according to the laser beam welding system according to the present invention will be described with reference to FIG. 6 is a block diagram showing an outer diameter welding apparatus according to the laser beam welding system of the present invention, and the same reference numerals are given to the same components as the inner diameter welding apparatus.

As shown in Fig. 6, the outer diameter welding device constituting the laser beam welding system according to the present invention comprises: a laser beam generator 10 for generating a laser beam 11; A laser beam energy supplier 20 for supplying energy to the laser beam generator 10; A reflector (50) reflecting the laser beam (11) generated from the laser beam generator (10) to a welding portion to be welded, that is, a welding line at a predetermined angle, and having a variable reflection angle; A focus lens (60) for focusing the laser beam (11) reflected from the reflector (50) on the welded portion of the weldment; A welding nozzle 65 for guiding the laser beam 11 focused by the focus lens 60 to a welding site; A CCTV camera 70 passing through the focus lens 60 and enlarging a welded portion to capture an image thereof to adjust initial position selection and focal length; A TV monitor 80 displaying an image captured by the CCTV camera 70; Clamping means for clamping the weldment; And driving means for rotating the clamping means. Reference numeral 94 is a manual shim tracking and positioning head crank, 95 is an upper slide table, and 96 is a threaded shaft.

In addition, the shield gas providing unit 110 is included to provide an effective shield by providing and filling the shield gas on the welding portion. The solenoid valve 111 is provided in the connection line connected to the shield gas providing unit 110 to provide the shield gas to the welding site.

In addition, it includes a host computer 130 for watching the welding progress and overall control. The host computer 130 is connected to and controlled by the laser beam energy supply 20, the controller 100 and the solenoid valve 111 described later.

The drive means comprise a latch, a DC motor 93 and a linear motion table for moving to the next position. The inner diameter welded convolutions are collected, threaded into an arbor and fixed, and then welded while being bitten by a latch. The linear motion table moves the latch located at the top to the next weld line by automatic or manual manner by a desired distance.

Here, in the case of manual, the moving handle can be turned by looking at the enlarged image of the CCTV monitor 70, and in the case of automatic, the precise movement distance can be controlled by the stepper motor and the computer. In addition, the CCTV camera 70 allows the welding line to be enlarged and visible on the monitor 80, and moving the nozzle including the focus lens 60 up and down to find a point where a clean image is formed on the monitor 80. This is the focal length to facilitate control.

The welding nozzle 65 includes a shield gas providing unit 110 to form a narrow gap between the welding portion and its nozzle to prevent oxidation, and to provide an effective shield by flowing the shield gas therebetween. do.

In this way, the nozzle is designed to work with 10-15% of the conventional TIG flow in one direction. That is, the welding gas is injected into the outer diameter welding device by the welding nozzle 65, which fills a small space between the nozzle end and the welding part located near the welding to block oxygen.

As such, welding gas flows around the laser beam irradiated through the center of the nozzle life, and a small amount of gas can be used by covering the welding part, and the gas is sucked back into the vacuum and discharged to the outside.

The nozzle 39 and the focus lens 40 may be moved up and down, and the focal length can be adjusted while watching the TV monitor 80. Here, the reflector 50 is mounted on a resonant scanner.

The laser beam 11 is bent at 90 degrees by the reflecting mirror 50 at a 45 degree angle when the reflecting mirror 50 is stopped without shaking.

In the outer diameter welding apparatus, a half weld ring 140 is inserted to absorb heat generated during welding and to accurately control the amount of melting. Figure 7a is a block diagram showing a welding ring constituting the outer diameter welding apparatus according to the present invention, Figure 7b is a cross-sectional view taken along the line AA of Figure 7a, when looking at the specific design form of the welding ring is first reused as two semicircles This is possible, and the edge of the ring is chamfered at an angle of 45 degrees, and the surface of the edge is processed finely so that the laser beam can be reflected.

Therefore, as shown in Fig. 9B during the welding, the scanning line deviating from the welding line is reflected on the edge (chamfered surface) of the ring and applied to the side of the welding portion. The outer diameter welding ring used in the present invention has a 45 degree angle chamfer shape without using a right angle groove or a notch, and the leveling of the surface should be sufficient to reflect the laser beam.

In other words, a semi-circular ring that can be reused is sandwiched between two sheets of inner diameter welded sheet, and when the welding starts, the laser beam is irradiated along the rotating welding spot, and the reflector shakes and the laser beam comes to the welding spot. You will repeat the work.

The outer diameter welding welding ring is easy to clean and less polluting than the right angle groove in the repeated use surface, it is also easy in terms of manufacturing cost is low. The energy reflected at the corners of the 45 degree angle is simultaneously applied to the sides of the weld, which allows for much more efficient and faster melting than the beam being fixed in the center at right angles to the top of the weld. Reflections on the surface of the ring result in less energy absorbed in the ring, resulting in longer ring life, and thus re-use at least 30 times.

In addition, the outer diameter welding device host computer 130 is controlled, and the inspection of the cooling water circulation, the temperature, the emergency switch state, etc. of the laser during the operation is performed at all times.

The laser used in the outer diameter welding device can be used in almost any form as long as the laser can melt the material as described in the inner diameter welding device, and it is also designed to be computer controlled, for example, energy, shutter, Interlocks and the like.

Hereinafter, the welding operation of the outer diameter welding apparatus according to the laser beam welding system according to the present invention will be described with reference to FIGS. 8 and 9A and 9B.

8 is an explanatory view schematically showing the outer diameter welding method according to the present invention, Figures 9a and 9b is the appearance of the welding line of the outer diameter welding device constituting the laser beam welding system according to the present invention and the shape of the laser beam irradiated The laser beam, which passes through the focus lens 60 and is irradiated to the weld line by the reflecting mirror 50 that floats at high speed, that is, repeatedly changes at high speed, falls down in parallel and is irradiated perpendicularly to the weld line. ) Is very large, the laser beam 11 irradiated to the welding line is irradiated in the form of a line.

At this time, the width of the irradiation line can be controlled up to the maximum angle of the resonant scanner (reflecting mirror), which is usually 2-3 times the area of the welding site, so that an expensive device for tracking the welding line moving during welding is unnecessary. Done.

The floating speed of the reflector 50 can also be changed by controlling the frequency of the resonance scanner, and the focal length laser beam 11 can shake 4000 times per second, so that the overlapping of the laser beam passing through the welding line is sufficient. No problem at all

Such a scanning method can be applied to inner diameter welding in the same manner. In particular, in the case of outer diameter welding, as shown in Figs. 9A and 9B, the welding is inserted during the outer diameter welding even when the laser beam 11 is vertically scanned on the welding line. Depending on the design of the ring 140, the laser beam 11 deviating from the weld line can have the same effect by the 45 ^o edge face (chamfer face) of the ring.

Such an outer diameter welding device shakes a reflector at high speed so that a laser beam may be scanned in the form of a line rather than a single point. Here, as described in the inner diameter welding apparatus, it is possible to use a method of dividing the laser beam into two and re-compositing the weld. In addition, by using a CCTV camera to enlarge the weld to view the image on the monitor and use it to control the exact focal length and position of the laser beam.

In the welding of the laser beam welding system according to the present invention as described above, all the information necessary for welding is placed in a notebook, and inputted into a computer before welding starts, and then re-controlled to the starting point for optimum conditions. Find it. Because the results of welding can change due to changes in the microscopic conditions, the previous conditions can not be absolutely repeatable information even if they can be the starting point.

For example, if the reflective wall of the turning wheel changes in material or the surface is discolored due to repeated heat, many parts of the pressure change, the temperature and purity of the welding gas, the minute composition of the material, the state of cleaning, etc. Due to the possibility of change, the reconditioning process must be carried out to adjust the optimum conditions.

Hereinafter, the area of the welding bead formed by the laser beam welding system of the present invention will be described with reference to FIG. 10 is a block diagram showing the formation of a weld bead according to the present invention.

In Figure 10, Ac is 2π × t ² in a circular area, At is t ² as a triangular area, Ap is pi (pie) and a region ^{1 / 2π × t 2 -t 2} , Aw is the weld zone (Ac- Ap) is 2π × t ² -1 / 2π × t ² + t ² .

Thus, H × 2t = Aw
H = (3 / 2π × t ² + t ² ) / 2t
H = (3 / 4π + 1/2) t = 2.856 t (1)
In addition, Hd + 2 ^1/2 × t + t = H
Hd = H-2 ^1/2 × t-t = 0.441 t (2)

Here, H is the distance from the bottom edge of the weld bead to the top of the shim, Hd is the distance from the top edge of the weld bead to the top of the shim, and t is the distance from the triangle peak in the weld bead to one end of the shim.

The welding form according to the laser beam welding system of the present invention as described above and the welding form according to the prior art welding system will be described with reference to Figs. 11A and 11B. 11A and 11B are cross-sectional views of a welded portion according to the conventional TIG type welding type and the laser type welding type according to the present invention, respectively.

As a result of the enlarged analysis, as shown in FIG. 11B, the laser welding form according to the present invention shows that the penetration is much deeper, which means that the welding strength is high. In addition, laser welding is light enough to ignore the damaged part due to instantaneous melting and solidification, compared to conventional methods, which have many heat-affected zones (HAZ) generated around the welding due to long-term heat. Proven by stress analysis and life cycle tests.

In addition, the positional tolerance of the laser beam used in the present invention is +/- 0.01 inch, which is much easier than the positional tolerance of +/- 0.001 inch of the device for precisely positioning the beam in the middle of two sheets using a weld line tracking device. . This is a revolutionary invention that can perform welding perfectly without requiring high precision, which requires no skilled workers, easy work replacement, easy melting, resulting in deep penetration and long product life and maintenance of the device. Easy to manage This welding content can be seen by comparing the conventional TIG welding content (see FIG. 11A), which is a conventional low density heat source, with the welding content (see FIG. 11B) of the present invention.

On the other hand, Figure 12 is a configuration diagram showing the misalignment of the male and female thin plates, Figures 5a, 5b and 6a and 6b described above when the scanning line is applied to the welding site during the inner and outer diameter welding in Figure 12, If the two sheets do not stand side by side, the welding content is not very good when the beam is not shaken and is scanned at the center of the two sheets by the welding line tracking device, but the laser beam welding system of the present invention can expect the result of uniform welding. have.

In other words, in the case of a normal high power laser, the density of the energy moves constantly when looking at the cross section of the laser beam being fired. As the welding progresses, it is easy to see that slight energy changes and energy density distributions change accordingly. As such, the energy density distribution that changes frequently during welding is because the size of the laser beam is similar to that of the welded portion, so that when the high energy density is biased to the left and right, more melting occurs therein, and therefore the welding result is uneven or irregular. In some cases, the welding is not performed, and the so-called asymmetric problem, which is biased to one side, occurs seriously. In the method of shaking irradiation, the energy density is uniform throughout the irradiation line, and the energy density change according to the energy change is also It does not affect the even density distribution of the entire radiation line. Therefore, the manufacturing tolerances of each device is not a problem even if the processing tolerances are not very precise, and the skill of the operator also does not significantly affect the production quality.

In addition, it is easy to replace the rotating rotary plate and to re-adjust the optical device when the work is replaced with a thin plate of a different size from the working thin plate. Both floating reflectors and beam delivery optics are fixed on the translation stage, and if you replace them with a new job, you can easily change the position of each optic by changing its position.

On the other hand, when the laser beam welding system according to the present invention will be described as superior to the conventional welding method as follows.

First, due to the high density of integrated energy, the melting and solidification of the laser is performed in a short time. Therefore, the thermal damage area is less than that of other methods, and the penetration of the laser is deep, resulting in a long product life.

Secondly, skilled workers are unnecessary, labor costs are reduced by the automation of the process, and production costs are reduced by 10 times the welding speed than conventional welding methods such as TIG.

Third, the welding difficulty according to the characteristics of the material is easy to weld.

Fourth, in the case of the inner diameter welding device, it is common to divide the beam into two parts, but by shaking and re-compiling the beam, the beam is split into two and scanned at a 45 degree angle from the top and bottom of each to synthesize at the welding site, thereby limiting the inner diameter of the thin plate. Do not receive.

Fifth, the upper and lower divided beams can be moved differently, so when welding thick plate and thin plate, the position of the beam can be controlled differently to achieve optimum welding.

Sixth, the expensive welding seam tracking device has a very fine performance, so there is a problem even in the small vibration, the present invention is not significantly affected by the change of the surroundings.

Seventh, manual or automatic welding seam tracking device is unnecessary by irradiating the laser beam in the form of a line.

Eighth, in the case of inner diameter welding device, the energy out of the welding part among the laser beams scanned in the form of a line while shaking at a 45 degree angle is reflected by the wall surface of the bleeding rotating plate and applied to the side of the welding part so that the melting is quick and the penetration is deep. This is greatly improved. In addition, in the case of the outer diameter welding device, the energy of the laser beam scanned in the form of a line while shaking is reflected by the welding ring and applied to the side of the welding part, so that the melting is quick and the penetration is deep, thus improving the product quality. .

Ninth, by giving the same bending as the bending of the thin plate inside the swivel plate of the inner diameter welding device can be accurately centered by controlling the position where the thin plate is placed. The laser beam can be reflected by smoothing the surface of the inner diameter wall of the bite rotating plate.

Tenth, it is easy to replace the swivel plate, the alignment of the optical device accordingly is very easy.

Eleventh, it is possible to observe the progress of the welding and control the position of the beam before welding by installing CCTV camera to enlarge the welding part.

Secondly, in the case of the inner diameter welding device, shield gas was injected into the sealed space and drawn out safely after welding to prevent contamination of the working environment, to safeguard the health of workers, and to significantly reduce the amount of gas used.

Thirteenth, inner diameter welding is done in an enclosed space, eliminating the need for a Class 1000 Clean Room.

Fourteenth, in the design of the welding ring, the laser beam can be reflected by giving a smoothly treated surface at an angle of 45 degrees to the edge, which results in longer ring life, easier cleaning, less contamination, Made easy.

Fifteenth, the design of the welding ring in two semicircles makes it possible to reuse, simplifying the injection and extraction, which greatly reduces the preparation process of the outer diameter welding, greatly reducing the production cost.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

As described above, according to the laser beam welding apparatus and method of the present invention, the laser beam is used to generate a perfect symmetrical weld bead, deepen the depth of penetration, the welding line manually controlled by the operator or automatically It enables welding without the need of automatic seam tracking, etc., and does not require delicate alignment or maintenance, and it is not sensitive to minute vibrations or temperature differences so that anyone can easily weld. There is.

Claims (21)

A laser beam generator for generating a laser; One or more reflectors for reflecting the laser; Reflector vibration means for angularly changing the reflector at high speed such that the reflecting angle of the laser is repeatedly changed in a predetermined range; A focus lens for focusing the laser onto the welded portion of the weldment; Clamping means for clamping the weldment; A central control unit for observing and controlling the welding process; And Shield gas supply unit for injecting shield gas into the closed space where the welded material is sealed from the outside to prevent oxidation during welding Laser beam welding system comprising a. delete The method of claim 1, Monitoring means for monitoring and displaying a state of welding a weld by the laser; And Position and distance adjusting means for adjusting the initial position and the focal length of the laser beam while viewing the image displayed by the monitoring means Laser beam welding system. The method of claim 3, The monitoring means A CCTV camera passing through the focus lens and magnifying the welded portion to capture an image thereof; And TV monitor for displaying the image taken from the CCTV camera Laser beam welding system. The method of claim 1, Welded moving means for moving the welded to the welding position, and the welded welded from the welding position further comprises; Laser beam welding system. The method of claim 5, The weldment movement means Stepper motors; A rotary table driven by the stepper motor; An air cylinder provided between the stepper motor and the rotary table; A plurality of robot arms installed on the rotary table; A sucker provided at an end of the robot arm; And Made of a vacuum pump connected to the sucker Laser beam welding system. The method of claim 1, It is provided in front of the laser beam generator, further comprising a laser beam branching means for irradiating and welding the welding material in both directions by branching and reflecting the laser beam irradiated from the laser beam generator in two directions. Laser beam welding system. The method of claim 7, wherein The laser beam branching means A spectrometer provided on the laser beam irradiation line generated by the laser beam generator and dividing the laser beam irradiated from the laser beam generator into an upper laser beam in the same straight line as the irradiation line and a lower laser beam perpendicular to the upper laser beam lens; A spectroscopic prism for irradiating the lower laser beam folded by the spectroscopic lens in parallel with the upper laser beam; And First and second reflecting mirrors reflecting the upper and lower laser beams in both directions of the weldment. Laser beam welding system. The method of claim 1, The clamping means An upper and lower rotary chuck plate which is movable in the vertical direction of the molten spot so as to press the welding material at a predetermined pressure from the upper and lower sides thereof, and is rotatably provided; And And driving means for rotating the rotary plate at a predetermined speed. Laser beam welding system. The method of claim 9, The weldment is made of a male and female diaphragm bent at both ends, The upper and lower rotary chuck has a curved surface corresponding to the bending of the male and female diaphragms Laser beam welding system. The method of claim 1, The clamping means Comprising a circular ring formed by two detachable semi-circles, the welded portion is placed to form a chamfered surface at a 45 degree angle, the chamfered surface is machined to reflect the laser beam Laser beam welding system. The method of claim 1, The laser is one of Nd: YAG, Nd: Glass, Nd: YNO, CO, CO2, Cr: Ruby, Diode Lasers, Diode Pumped Lasers Laser beam welding system. A laser beam generator for generating a laser beam; A spectroscopic lens dividing the laser beam generated from the laser beam generator in one straight line from the laser beam generator and the other perpendicular to the laser beam generator; A spectroscopic prism for irradiating the laser beam perpendicularly folded by the spectroscopic lens in parallel with another laser beam; A reflector reflecting the laser beam at a predetermined angle, the reflecting angle being variable; Reflector vibration means for angularly changing the reflector at high speed such that the reflecting angle of the laser is repeatedly changed in a predetermined range; A focus lens for focusing the laser beam reflected from the reflector on the welded portion of the weldment; A camera which passes through the focus lens and takes an image of the welded part of the weldment to enlarge an image; A monitor configured to display an image photographed by the camera; Adjusting means for adjusting an initial position and a focal length of the laser beam while looking at the monitor; An upper and lower rotary chuck plate clamping the welded material and rotating at a predetermined speed; A driving source providing a power source to rotate the upper and lower rotary chucks at a constant speed; A shield gas providing unit which provides a shielding gas to an enclosed space in which the welded object is sealed from the outside to prevent oxidation during welding; And Control unit for controlling the adjustment means, drive source, reflector vibration means and shield gas providing unit Laser beam welding system comprising a. A laser beam generator for generating a laser beam; A reflector reflecting the laser beam generated from the laser beam generator to a welded portion of the weldment, the reflecting angle being variable; Reflector vibration means for angularly changing the reflector at high speed such that the reflecting angle of the laser is repeatedly changed in a predetermined range; A focus lens for focusing the laser beam reflected from the reflector on the welded portion of the weldment; A welding nozzle guiding a laser beam focused by the focus lens to a welding site; A camera which passes the focus lens and takes an image by enlarging a welding part; A monitor configured to display an image photographed by the camera; Adjusting means for adjusting an initial position and a focal length of the laser beam while looking at the monitor; Clamping means for clamping the weldment; Drive means for rotating the clamping means; A shield gas providing unit which provides a shielding gas to an enclosed space in which the welded object is sealed from the outside to prevent oxidation during welding; And Control unit for controlling the adjusting means, the driving means, the reflector vibration means and the shield gas providing unit Laser beam welding system comprising a. The method of claim 14, The clamping means Comprising a circular ring formed by two detachable semi-circles, the welded portion is placed to form a chamfered surface at a 45 degree angle, the chamfered surface is machined to reflect the laser beam Laser beam welding system. The method according to claim 13 or 14, Welded moving means for moving the welded to the welding position, and the welded welded from the welding position further comprises; Laser beam welding system. A laser beam irradiation step of irradiating a laser beam; A reflection step of reflecting the irradiated laser beam at a predetermined angle using a reflector; A focus setting step of focusing on a welded portion of the welded object of the reflected laser beam; An angle change step of irradiating the laser beam in the form of a line by repeatedly changing the angle of the reflector at a high speed in a predetermined range while the laser beam is in focus; And Shield gas providing step for providing shield gas to the closed space where the welded material is sealed from the outside to prevent coral action during welding Laser beam welding method comprising a. delete The method of claim 17, It further comprises a laser beam branching step of irradiating the welded portion of the weldment in both directions by branching the irradiated laser beam into two branches. Laser beam welding method. The method of claim 19, The laser beam branching step Spectroscopic step of spectroscopy the irradiated laser beam into a linear first laser beam and a second laser beam branching perpendicularly to the laser beam; A second laser beam reflection step of reflecting the perpendicularly branched second laser beam to be irradiated in parallel with the first laser beam; A focus setting step of focusing the reflected first and second laser beams; A side irradiation step of irradiating the focused first laser beam to one side of a welded portion of a weldment; Simultaneously with the one side irradiation step, the other side irradiation step of irradiating the focused second laser beam to the other side of the welded portion of the weldment; Laser beam welding method. The method of claim 17, And a weldment moving step of automatically moving the weldment before welding to the welding position and automatically moving the weldment after welding from the welding position. Laser beam welding method.

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