JP2018134657A - Manual type laser welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manual type laser welding device which enables a user to hold the device with one hand and perform welding work and is suitable for welding of a minimal portion.SOLUTION: In a body 2 configured to be held by one hand, a laser module 5 which causes a light emitting element 20 to perform laser oscillation to emit a laser beam LB, a radiation member 9 which incorporates a control circuit 7 for controlling the laser module 5 and is used to radiate the laser beam LB emitted from the laser module 5 to a welding object portion 10, and a radiation button 17 used to turn on or off the laser module 5 are provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser welding apparatus for performing soldering, synthetic resin welding, etc. by irradiating a laser beam. More specifically, the welding operation can be performed manually by holding it in one hand. The present invention also relates to a manual laser welding apparatus suitable for the above.

For example, when a lead of an electronic component is manually soldered to an electrode portion formed on a circuit board, a soldering iron is generally used. As disclosed in Patent Document 1, this solder iron has a hook tip at the tip of a handle for holding in one hand, and has a heater inside a case surrounding the hook tip. The tip is heated, the electrode portion and the lead are heated with the heated tip, the solder is melted, and the lead is bonded to the electrode portion with the melted solder.
On the other hand, in recent years, the electronic parts have been miniaturized, and the parts to be soldered such as electrodes and leads have been minimised accordingly. Is now required.

  However, downsizing the solder iron tip has a limit in terms of durability. For example, when the tip diameter of the tip of the tip is formed to 0.2 mm and this tip is heated to 380 degrees and soldered, it is subject to erosion by tin, which is the main component of the solder, so the tip has a short life. Experiments have confirmed that it will take about 2 hours. For this reason, it has been practically impossible to perform soldering of a minimal part using a soldering iron.

On the other hand, a laser soldering apparatus using laser light is also known. As disclosed in Patent Document 2, this laser soldering apparatus is formed by connecting a laser generator for generating laser light and an irradiation head having a built-in condenser lens with an optical fiber. The laser beam generated in (1) is guided to an irradiation head through the optical fiber, condensed by the condensing lens and irradiated to a soldering site, and the solder is melted and soldered by the energy.
Since this laser soldering device can solder the soldering part without contact with the solder, there is no problem of erosion caused by tin, and the beam diameter of the laser beam can be narrowed down. Soldering can also be performed.

  However, since the conventional laser soldering apparatus has the above-described apparatus configuration, it is very large as a whole, so that it can only be used by being mounted on a soldering robot. Accordingly, there is a demand for the appearance of a simple and miniaturized laser soldering apparatus that can be manually soldered. This problem is the same in a welding apparatus for welding synthetic resin.

Japanese Utility Model Publication No. 62-56272 JP 2001-198670 A

  An object of the present invention is to provide a manual laser welding apparatus that can be manually held by one hand and is also suitable for welding a minimal part.

  In order to solve the above problems, according to the present invention, a laser module that emits laser light by causing a light emitting element to oscillate in a body configured to be held in one hand, and a control circuit that controls the laser module are provided. It is built-in, and is provided with an irradiation member for irradiating the laser beam emitted from the laser module toward the welding target part, and an irradiation button for turning on and off the laser module. A featured manual laser welding apparatus is provided.

  The irradiation member has a fiber holder that also serves as an optical connector, and an optical fiber that has a proximal end portion held by the fiber holder and has a distal end portion extending forward from the fiber holder, and is detachable from the body. The beam diameter of the laser beam can be changed by replacing the irradiation member with another irradiation member having a different optical fiber diameter.

  Preferably, in the present invention, a mode changeover switch for switching the control mode of the control circuit to the body between an irradiation mode in which laser light can be emitted from the laser module and a stop mode in which laser light cannot be emitted. And the operation of the irradiation button is made effective only when the control mode is switched to the irradiation mode with the mode switch.

  In the present invention, the guide light composed of visible light having a lower output than the laser light can be emitted along the optical axis of the laser light.

In the laser welding apparatus of the present invention, a gas channel is formed inside the body so as to contact the laser module, and a gas inlet for introducing an inert gas into the gas channel is provided at the rear end of the body. The gas injection port for injecting the inert gas in the gas flow path toward the welding target portion may be formed at the tip of the body.
In this case, it is desirable that the plurality of gas injection ports be arranged so that an inert gas can be injected from the injection ports into a state surrounding the optical fiber.

  The laser welding apparatus of the present invention incorporates a laser module and a control circuit in a body configured to be held in one hand, and irradiation for irradiating a laser beam emitted from the laser module toward a welding target site. Since the member is attached, it is small as a whole, and it can be held by one hand and can be manually welded, and a minimal portion can be welded by laser light.

It is a top view which shows 1st Embodiment of the soldering apparatus which is a typical example of the laser welding apparatus which concerns on this invention. It is a side view of FIG. It is sectional drawing of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is a circuit diagram which shows an example of the electrical / optical circuit of a soldering apparatus. It is a circuit diagram which shows the other example of the electrical / optical circuit of a soldering apparatus. FIG. 2 is an exploded view of FIG. 1. It is a perspective view of an irradiation member. It is principal part sectional drawing which shows the modification of the attachment structure of an irradiation member. It is a side view of the state which is soldering with the soldering apparatus of 1st Embodiment. It is a partial side view which shows the modification of 1st Embodiment. It is a side view which shows the modification of a laser module. It is a front view which shows the other modification of a laser module. It is a side view which shows 2nd Embodiment of a laser welding apparatus. It is a side view which shows 3rd Embodiment of a laser welding apparatus. It is a side view which shows the other modification of an irradiation member.

  The figure shows a soldering apparatus as a typical example of the manual laser welding apparatus according to the present invention. For example, as shown in FIG. 10, this soldering apparatus is used to solder a lead 12a of an electronic component 12 by irradiating a laser beam onto an electrode portion 11a formed on a circuit board 11. It is. Therefore, the following description will be given with respect to this soldering apparatus.

  As shown in FIGS. 1 to 4, the soldering apparatus 1 </ b> A of the first embodiment has a pen-shaped body 2 configured to be held in one hand. The body 2 is formed of a metal or a synthetic resin in a hollow shape, and includes a main body portion 2a that also serves as a grip portion, and a conical portion 2b that is formed so as to be gradually tapered at the tip of the main body portion 2a. The main body portion 2a and the conical portion 2b are arranged substantially straight along the axis L.

  Referring also to the circuit diagram of FIG. 5, a circuit board on which a laser module 5 made of a semiconductor laser and a control circuit 7 for controlling the entire soldering apparatus 1 </ b> A including the laser module 5 are mounted inside the body 2. 6 and a rechargeable battery 8 for supplying power to the laser module 5 and the control circuit 7 are arranged and built in the order described above from the front end side to the rear end side of the body 2, An irradiation member 9 for irradiating the laser beam LB emitted from the laser module 5 toward the soldering portion 10 (see FIG. 10) is attached to the tip of the conical portion 2b of the body 2.

  Further, on the outer surface of the body 2, a power switch 13 for opening and closing a power circuit 14 connecting the control circuit 7 and the battery 8, a mode switching button 15 for switching a control mode by the control circuit 7, An irradiation button 16 for opening and closing an irradiation circuit 16 connecting the control circuit 7 and the laser module 5 to turn on / off the laser module 5 to irradiate and stop the laser beam LB, and on / off of the laser module 5 An indicator lamp 18 that is turned on and off in conjunction with the display and a display unit 19 that displays the operating state of the soldering apparatus 1A are provided. In FIG. 2, the description of the electrical wiring is omitted.

  The laser module 5 emits a laser beam LB from the light emitting element 20 by causing a current to flow through the light emitting element 20 made of a semiconductor and causing the light emitting element 20 to oscillate. The module made of synthetic resin, metal, or the like. Inside the case 21, the light emitting element 20 and a plurality of optical lenses 22a, 22b, 22c are built in along the optical axis, that is, the axis L, and the laser beam LB condensed by the optical lenses 22a, 22b, 22c. Is emitted toward the irradiation member 9 from the emission port 5a formed at the tip of the module case 21. The laser beam LB is set to have a wavelength of 800 to 1000 nm and an output of about 3.5 to 5 W, for example.

  Further, the laser module 5 is provided with a guide light generating element 25 for emitting guide light GB made of infrared light in the visible light range, and from the guide light generating element 25, the laser light LB is emitted. The guide light GB emitted in the direction perpendicular to the optical axis L is bent in the direction of the optical axis L by the semi-transparent mirror 26 and can be emitted along the optical axis L. The semi-transparent mirror 26 has a property of transmitting the laser beam LB but totally reflecting visible light. The guide light generating element 25 may be provided inside or outside the module case 21.

  The guide light GB is aimed at the irradiation position of the laser beam LB by irradiating the soldering site 10 with the guide light GB in advance when soldering the soldering site 10 with the laser beam LB. The output is set to be lower than that of the laser beam LB (about 5 mW).

  In FIG. 5, the semi-transparent mirror 26 is disposed between the first optical lens 22a and the second optical lens 22b, and the guide light GB emitted from the guide light generating element 25 is supplied to the semi-transparent mirror. After being reflected at 26, the light is emitted through the second optical lens 22b and the third optical lens 22c. As shown in FIG. 6, the semi-transparent mirror 26 is disposed outside the third optical lens 22c. The guide light GB arranged on the (front side) and emitted from the guide light generating element 25 can be reflected by the semi-transparent mirror 26 in the direction of the optical axis L and directly incident on the irradiation member 9.

As is apparent from FIGS. 4, 7, and 8, the irradiation member 9 includes a fiber holder 30 that also serves as an optical connector, a base end portion held by the fiber holder 30, and a distal end portion forward of the fiber holder 30. And an optical fiber 31 extending in the direction.
The fiber holder 30 is a cylindrical part having a diameter smaller than that of the body 2 and has a fiber insertion hole 32 into which the optical fiber 31 is inserted at the center thereof, and protects the optical fiber 31 at the tip. A protective tube portion 33 having a thin tubular shape is provided, and an attachment portion 30a is provided at the base end portion. The attachment portion 30a is inserted into an attachment hole 2d that opens at the distal end of the conical portion 2b of the body 2. By doing so, it is detachably attached to the body 2.

  In addition, an incident port 32a facing the proximal end of the optical fiber 31 is formed at the proximal end of the mounting portion 30a. The incident port 32a is connected to the exit 5a at the distal end of the laser module 5 inside the body 2. By facing each other, the laser module 5 and the fiber holder 30 are optically connected.

  The irradiation member 9 is detachably attached to the body 2. For this attachment, the attachment part 30a of the fiber holder 30 is formed with a cylindrical tip part 30b and a non-circular anti-rotation part 30c such as a polygon such as a hexagon. On the other hand, the mounting hole 2d of the body 2 is formed with a circular hole portion 2e into which the tip end portion 30b is fitted and a non-circular hole portion 2f into which the rotation preventing portion 30c is fitted. A permanent magnet 34 is attached to the bottom of the hole, and the irradiation member 9 is attracted to each other by a magnetic force between the permanent magnet 34 and the anti-rotation portion 30c formed of a magnetic material such as iron. However, it is stably attached to the body 2 in a predetermined fixed orientation in a posture in which rotation is restricted.

  However, other attachment methods can be used. For example, as shown in FIG. 9, a male screw part 30d is formed in a part of the attachment part 30a, and a female screw part 2g is formed in a part of the attachment hole 2d, and the male screw part 2g is formed in the female screw part 2g. A method of screwing the portion 30d can also be used.

  Since the irradiation member 9 is detachable with respect to the body 2, it can be replaced with another irradiation member 9 having a different optical fiber 31 wire diameter. The beam diameter of the laser beam LB can be changed according to the size of the attachment point. For example, if six types of irradiation members 9 having a diameter of the optical fiber 31 of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.6 mm, and 0.8 mm are prepared, the laser beam LB The beam diameter can be changed to six types.

  The mode switching button 15 has first to third three switching buttons 15a-15c. Among these, the first switching button 15a is for switching the control mode between an irradiation mode in which the laser beam LB can be irradiated and a stop mode in which the laser beam LB cannot be irradiated. The second switching button 15b and the third switching button 15c increase and decrease the output of the laser beam LB, emit and stop the guide beam GB, and change the display of the display unit 19. belongs to.

  When the control mode is switched to the irradiation mode by the first switching button 15a, the irradiation circuit 16 is connected to the power supply circuit 14 by the control circuit 7, so that the operation of the irradiation button 17 becomes effective. At the same time that the laser module 5 can be turned on / off, the irradiation mode lamp 36 provided on the display unit 19 is turned on. Further, when the control mode is switched to the stop mode by the first switching button 15a, the irradiation circuit 16 is disconnected from the power supply circuit 14 by the control circuit 7, so that the operation of the irradiation button 17 becomes invalid. At the same time that the module 5 cannot be turned on / off, the irradiation mode lamp 36 is turned off.

On the other hand, the irradiation button 17 is configured to close the irradiation circuit 16 only while the irradiation button 17 is pressed and to open the irradiation circuit 16 when released. Accordingly, when the irradiation button 17 is pressed while the control mode is switched to the irradiation mode, the laser module 5 is turned on and the laser beam LB is emitted only while the irradiation button 17 is being pressed. When the pressure is released by releasing the button, the laser module 5 is turned off, the emission of the laser beam LB is stopped, and the indicator lamp 18 is turned on or off in synchronization therewith.
When the control mode is switched to the stop mode, the laser circuit 5 is not turned on even if the irradiation button 17 is pressed because the irradiation circuit 16 is disconnected from the power source.

  When the laser beam LB is irradiated, the indicator lamp 18 is turned on, and at the same time, a buzzer can be sounded to notify the operator. The buzzer mode is turned on / off by the second switch button 15b or the third switch button 15c.

  The switches, buttons, and lamps may be provided at any position on the body 2 as long as they are easy to operate and view. However, in the illustrated embodiment, the power switch 13, the display unit 19, and the irradiation button 17 are provided. Indicator lamps 18 are arranged on the upper surface of the body 2 in the above order from the rear end side to the front end side of the body 2, and the mode switching button 15 is provided on the side surface of the body 2. In this case, it is desirable to provide the mode switching buttons 15 on both the left and right sides of the body 2 so that the operator can easily operate whether the subject is right-handed or left-handed.

The operation when using the soldering apparatus 1A having the above-described configuration and performing, for example, reflow soldering is as follows.
That is, first, the power switch 13 is turned on, and the control mode is switched to the irradiation mode by the first switching button 15a of the mode switching button 15.
Subsequently, the body 2 is held as if holding a pen with one hand, and the tip of the optical fiber 31 is brought close to the soldering part 10 as shown in FIG. The module 5 is activated, and the laser beam LB is irradiated from the tip of the optical fiber 31 toward the soldering portion 10. Then, the solder 37 applied to the electrode part 11a is melted by the thermal energy of the laser beam LB, and the electrode part 11a and the lead 12a are soldered.

  At this time, in order to prevent erroneous irradiation of the laser beam LB, before the laser beam LB is irradiated toward the soldering site 10, the operation of the second switching button 15b or the third switching button 15c is performed. The guide light GB is emitted from the laser module 5, and the irradiation position of the laser light LB is preliminarily applied to the irradiation position of the laser light LB so that the irradiation position is aimed. Is preferably irradiated.

  When the soldering of one soldering part 10 is completed, the irradiation of the laser beam LB is stopped by releasing the finger by releasing the finger from the irradiation button 17, and the soldering apparatus 1A is moved to the next soldering in that state. The soldering part 10 is moved to the soldering part 10 and soldered by the same operation. At this time, the guide light GB remains emitted.

  On the other hand, it is also possible to perform soldering using linear solder. In this case, for example, the supply is performed while automatically supplying a necessary amount of linear solder from the solder supply device toward the soldering portion 10. Soldering can be performed by melting the linear solder with the laser beam LB. Alternatively, a solder supply nozzle is provided on the opposite side of the hand having the soldering apparatus 1A, and the linear solder is supplied from the solder supply nozzle. It can also be soldered.

  The body 2 is configured to be separable into a plurality of parts along the axis L, and the parts such as the laser module 5, the circuit board 6, and the battery 8 are inspected and replaced by separating them. Or a part or all of the body 2 is formed so as to be openable and closable along a plane including the axis L or a plane parallel to the axis L, It is also possible to configure such that each part can be inspected and replaced by opening the body 2.

  As a modification of the first embodiment, since the laser module 5 generates heat during operation, the heat is released to the outside. Therefore, as shown in FIG. 11, at least a portion of the body 2 surrounding the laser module 5 is provided. A plurality of heat radiation holes 40 can be provided. The heat radiating hole 40 may be a circular hole or a long hole elongated in the direction of the axis L, and the heat radiating hole 40 may be regularly or irregularly arranged in the circumferential direction of the body 2 and the axis L direction. It is desirable to form side by side.

  Furthermore, at the same time as providing the heat radiating hole 40, the laser module 5 is made of a metal having excellent thermal conductivity, such as aluminum, as shown in FIG. It is desirable to provide one or a plurality of heat dissipation members 41 so as to be exposed on the outer surface of the module case 21. The heat radiating member 41 may be formed so as not to protrude outward from the outer surface of the module case 21, but as shown in FIG. You may form so that it may protrude from the case 21 radially.

  FIG. 14 shows a second embodiment of the laser welding apparatus (soldering apparatus) according to the present invention. The soldering apparatus 1B of the second embodiment is different from the soldering apparatus 1A of the first embodiment. These are the points provided with the mechanism for injecting an inert gas toward the soldering site | part 10 at the time of soldering. This inert gas prevents oxidation of the solder and the soldering portion 10 during soldering, and as such an inert gas, nitrogen gas, argon gas, or the like is used.

For this reason, in the soldering apparatus 1B of the second embodiment, the gas flow path 44 is formed inside the body 2, and the gas introduction port 45 for introducing an inert gas into the gas flow path 44 is provided in the body. 2, a gas injection port 46 for injecting an inert gas in the gas flow path 44 toward the soldering part 10 is formed at the end of the body 2 at the axis L Is formed so as to open toward the front of the body 2.
A flexible gas supply pipe 47 made of synthetic resin, rubber or the like is connected to the gas introduction port 45, and the inert gas is supplied from a gas source through the gas supply pipe 47.
Although the number of the gas injection ports 46 may be one, it is preferably a plurality, and in the illustrated embodiment, the plurality of gas injection ports 46 are arranged near the tip of the cone portion 2b. It is formed so as to surround it.

  In this case, preferably, in order to prevent the inert gas injected from the gas injection port 46 from spreading in a diverging manner, a cap formed in a tapered shape at the tip of the conical portion 2b. 48, and a gas outlet 48a at the tip of the cap 48 is disposed near the tip of the optical fiber 31, so that the inert gas can be concentrated and injected to the soldering portion 10.

  The gas flow path 44 has a main flow path 44a surrounding the outer periphery in contact with the outer periphery of the laser module 5, and one or more holes connecting the main flow path 44a and the gas introduction port 45. The supply flow path 44b is provided in a place that does not interfere with the arrangement of the control circuit 7, the circuit board 6, the battery 8, and the like.

  Even if the main flow path 44a surrounds the outer periphery of the laser module 5, it does not necessarily have to be continuous in the circumferential direction of the laser module 5; You may be divided into.

  Thus, by forming the gas channel 44 so as to surround the outer periphery of the laser module 5, the laser module 5 is cooled by contact with the inert gas flowing through the gas channel 44. . Therefore, the inert gas has a function of preventing oxidation of the solder and the soldering part 10 during soldering and a function of cooling the laser module 5. At this time, the inert gas absorbs heat by cooling the laser module 5 and rises in temperature, and is jetted toward the soldering portion 10 in a heated state. It is difficult to cause a temperature drop of the attachment part 10.

  In order to facilitate cooling of the laser module 5 by the inert gas, the laser module 5 includes one of a metal having excellent thermal conductivity, such as aluminum, as shown in FIGS. It is desirable to provide a plurality of heat dissipating members 41 so as to face the main flow path 44a.

  Other configurations, modifications, and operations of the soldering apparatus 1B of the second embodiment are substantially the same as those of the soldering apparatus 1A of the first embodiment. The reference numerals used in the first embodiment are attached and the description thereof is omitted.

FIG. 15 shows a third embodiment of the laser welding apparatus (soldering apparatus) according to the present invention. The soldering apparatus 1C according to the third embodiment is characterized in that the body 2 has a pistol shape. This is different from the soldering apparatus 1A of the first embodiment.
That is, the body 2 of the soldering apparatus 1C of the third embodiment includes a main body portion 2a and a conical portion 2b that are continuous along the axis L, and a grip portion 2c that extends from the main body portion 2a in a direction crossing the axis L. The main body 2a and the conical portion 2b accommodate the laser module 5, the control circuit 7, the circuit board 6, and the battery 8, and the power switch 13, the indicator lamp 18, and the display. A portion 19 and a mode switching button 15 are provided, and an irradiation button 17 is provided on the grip portion 2c. However, the battery 8 may be housed inside the grip portion 2c.

  Other configurations, modifications, and operations of the soldering apparatus 1C of the third embodiment are substantially the same as those of the soldering apparatus 1A of the first embodiment, and therefore, the main and identical components of both are the same. The reference numerals used in the first embodiment are attached and the description thereof is omitted.

  Further, the soldering apparatus 1C of the third embodiment can include a mechanism for injecting an inert gas, like the soldering apparatus 1B of the second embodiment. In this case, the main body 2a and the conical portion 2b of the body 2 are configured in the same manner as the body 2 of the soldering apparatus 1B of the second embodiment.

  In each embodiment, the irradiation button 17 may be a self-holding type. That is, when the irradiation button 17 is pressed once or switched to the on position, the on state is maintained as it is, the laser module 5 is turned on, the laser beam LB is emitted, and the irradiation button 17 is turned on. When the button is pressed again or switched to the off position, the irradiation button 17 is turned off, and the laser module 5 may be turned off to stop the laser beam LB.

  Further, in each of the above embodiments, the optical fiber 31 of the irradiation member 9 extends straight forward from the fiber holder 30. However, as in the irradiation member 9A shown in FIG. It may be bent. Alternatively, the irradiation member 9 in which the optical fiber 31 extends straight from the fiber holder 30 is positioned at the tip of the body 2, the position where the optical fiber 31 extends along the axis L, and the position where the optical fiber 31 is inclined with respect to the axis L In addition, it can be attached so that the angle can be adjusted.

  Furthermore, in each said embodiment, although the rechargeable battery 8 is provided, a power receiving terminal is provided in the rear-end part of the body 2, without providing such a battery 8, AC power supply or this power receiving terminal is provided. It is also possible to use a power supply line directly connected from a DC power supply.

  In addition, although the said embodiment is a soldering apparatus, it cannot be overemphasized that this invention is applicable also to the welding apparatus which welds the parts made from a synthetic resin with a laser beam.

2 Body 5 Laser module 7 Control circuit 9, 9A Irradiation member 10 Soldering part 15 Mode switching button 17 Irradiation button 20 Light emitting element 30 Fiber holder 31 Optical fiber 44 Gas flow path 45 Gas inlet 46 Gas injection port LB Laser light GB Guide light L axis (optical axis)

Claims (7)

  The body configured to be held in one hand contains a laser module that oscillates the light emitting element to emit laser light, and a control circuit that controls the laser module, and the laser emitted from the laser module A manual laser welding apparatus comprising: an irradiation member for irradiating light toward a welding target site; and an irradiation button for turning on and off the laser module.   The irradiation member has a fiber holder that also serves as an optical connector, and an optical fiber that has a proximal end portion held by the fiber holder and has a distal end portion extending forward from the fiber holder, and is detachable from the body. The laser welding apparatus according to claim 1, wherein the laser welding apparatus is attached.   The laser welding apparatus according to claim 2, wherein the beam diameter of the laser beam can be changed by replacing the irradiation member with another irradiation member having a different optical fiber diameter.   The body is provided with a mode changeover switch for switching the control mode by the control circuit between an irradiation mode in which laser light can be emitted from the laser module and a stop mode in which laser light cannot be emitted. 4. The laser welding apparatus according to claim 1, wherein the operation of the irradiation button is made effective only when the control mode is switched to the irradiation mode with a mode switch.   The laser welding apparatus according to any one of claims 1 to 4, wherein guide light composed of visible light having a lower output than the laser light can be emitted along an optical axis of the laser light.   Inside the body, a gas flow path is formed in contact with the laser module, and a gas inlet for introducing an inert gas into the gas flow path is formed at the rear end of the body, The gas injection port for injecting the inert gas in the said gas flow path toward the welding object site | part is formed in the front-end | tip part of the said body, The one in any one of Claim 1 to 5 characterized by the above-mentioned. Laser welding equipment.   The laser welding apparatus according to claim 6, wherein the plurality of gas injection ports are arranged so that an inert gas can be injected from the injection ports into a state surrounding the periphery of the optical fiber.

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