JP2014079784A - Air flow control method and air flow control device in welding work room - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air flow control device in a welding work room capable of suppressing a weld unstable phenomenon caused by shading of laser by controlling a direction of fume generated in laser welding.SOLUTION: A laser welding robot 40 is disposed inside a welding work room 10 having a suction exhaust port 23 on a ceiling wall 15 and outside air intake ports 21, 22 on right and left side walls 13, 14, for performing dust collection in a room internal environment by forced exhaust from the suction exhaust port 23. When a work is welded by emitting laser light in such an attitude that the axis of a welding head 30 is tilted, the direction of a dust collection resulting flow generated between the tip of the welding head 30 and the work is controlled by switching the outside air intake ports 21, 22 to be used, to thereby avoid shading of laser light caused by fume.

Description

  The present invention relates to an air flow generated due to dust collection (hereinafter referred to as “dust collection-induced flow” when performing dust collection while performing laser welding on a metal workpiece in a welding work room provided with a laser welding apparatus. The air flow control method and the air flow control device in the welding work room are designed to improve the stability of the welding work by controlling the direction of ")".

  A laser welding device (laser welding robot) that performs welding by irradiating a workpiece with a laser beam from a welding head attached to the tip of a robot arm is generally surrounded by an enclosure wall (partition) in all directions. It is arranged in a welding work room (also called a booth) that prevents laser reflected light and fumes from leaking out.

  In this type of welding work room, a suction exhaust port connected to the dust collector is provided, and the dust in the room environment is collected by forced exhaust from the suction exhaust port (see, for example, Patent Document 1).

JP 2006-75876 A

  By the way, when metal is laser welded, a large amount of fumes is generated from the base material heated and melted. This fume rises by convection because of its high temperature. When irradiating the laser beam toward the upper surface of the workpiece to be processed, the fumes rising from the processing point may shield the laser beam toward the processing point and make the welding width and penetration unstable.

  For example, in laser welding, welding is generally performed by irradiating a laser beam with a position where the welding head is slightly tilted from an axis perpendicular to the workpiece without irradiating the laser beam perpendicularly to the workpiece. Is. This is to prevent the reflected light of the laser from the workpiece from returning to the oscillator that outputs the laser and damaging the optical system. At this time, there is a case where the fume rising upward from the processing point shields the laser light emitted from the welding head in an inclined posture depending on the wind direction in the room. If it does so, sufficient laser beam may not be irradiated to a processing point, but a welding width and penetration may become unstable.

  In consideration of the above circumstances, the present invention provides an air flow control method and an air flow control device for a welding work room in which the direction of fumes generated by laser welding is controlled to suppress welding instability due to light shielding. With the goal.

  In order to solve the above-mentioned problem, an airflow control method in a welding work room according to the invention of claim 1 includes a suction exhaust port and an outside air intake port on an enclosure wall that surrounds the side surface and the ceiling surface. A position in which a laser welding device is arranged inside a welding work room that collects dust in the room environment by forced exhaust, and the axis of the welding head of the laser welding device is tilted in a fixed direction with respect to a line perpendicular to the surface of the workpiece Then, when laser beam is emitted from the tip of the welding head along the axial direction and the workpiece is laser-welded, the opposite of the welding head is inclined between the tip of the welding head and the workpiece. The air flow in the welding work chamber is controlled so that an air flow caused by dust collection is generated in either the direction toward the direction or the direction perpendicular to the direction in which the welding head is inclined. That And butterflies.

  Invention of Claim 2 is the airflow control method in the welding work room of Claim 1, Comprising: The advancing direction with respect to the workpiece | work of the said welding head is a head front side, the other side is a head rear side, The head rear side to a head front side When the left side and the right side of the head are the left side and the right side of the head, respectively, the axis of the welding head is inclined to the head rear side by a predetermined angle with respect to a line perpendicular to the surface of the workpiece, and the tip of the welding head and the workpiece Of the four directions, the direction from the head front side to the head rear side, the head rear side to the head front side, the head left side to the head right side, and the head right side to the head left side. The inside of the welding work room so that an air flow caused by dust collection occurs in any one of the three directions excluding the direction from the front side to the head rear side. And controlling the flow of air.

  Invention of Claim 3 is the airflow control method in the welding work room of Claim 1 or 2, Comprising: The said suction exhaust port connected to a dust collector is provided in the enclosure wall of a ceiling surface, and the enclosure of 2 side surfaces which mutually oppose The outside air intake is provided in each wall, and the direction of the air flow caused by dust collection generated between the tip of the welding head and the workpiece is changed by switching the outside air intake to be used. Features.

  Invention of Claim 4 is the airflow control method in the welding work room of Claim 1 or 2, Comprising: The said several suction exhaust port connected to a dust collector is provided in the enclosure wall of a ceiling surface, and the enclosure wall of a side surface is provided. The outside air inlet is provided, and the direction of the air flow caused by dust collection generated between the tip of the welding head and the workpiece is changed by switching the suction exhaust port to be used. .

  An air flow control device in a welding work room according to a fifth aspect of the present invention has a suction exhaust port and an outside air intake port on a wall surrounding the side surface and the ceiling surface, and collects the environment in the room by forced exhaust from the suction exhaust port. A welding work room for performing dust, and a laser welding apparatus disposed in the welding work room, wherein the welding head of the laser welding apparatus has an axis line in a fixed direction with respect to a line perpendicular to the surface of the workpiece. The workpiece is laser-welded by emitting laser light along the axial direction from the tip of the welding head in a posture inclined to the welding head. Air flow caused by dust collection is generated in any of the direction from the direction in which the welding head is inclined to the opposite direction and the direction orthogonal to the direction in which the welding head is inclined. And said Control means for controlling the internal flow of air tangent Chamber, characterized in that is provided.

  The invention according to claim 6 is the air flow control device in the welding work room according to claim 5, wherein the advancing direction of the welding head with respect to the workpiece is the head front side, the opposite side is the head rear side, and the head rear side to the head front side. When the left side and the right side when looking at the head are the left side and the right side of the head, respectively, the axis of the welding head is inclined to the head rear side by a predetermined angle with respect to a line perpendicular to the surface of the workpiece, and the control means The direction from the head front side to the head rear side, the head rear side to the head front side, the head left side to the head right side, and the head right side to the head left side between the tip of the welding head and the workpiece Air flow caused by dust collection is generated in any one of the three directions except the direction from the head front side to the head rear side. , It controls the internal flow of air in the welding operation room.

  The invention according to claim 7 is the air flow control device in the welding work room according to claim 5 or 6, wherein the suction exhaust port connected to the dust collector is provided on the enclosure wall of the ceiling surface, and the enclosures on the two side surfaces facing each other. The outside air intake is provided in each wall, and the control means is adapted to switch the outside air inlet to be used, and the direction of air flow caused by dust collection generated between the tip of the welding head and the workpiece It is characterized by changing.

  The invention according to claim 8 is the air flow control device in the welding work room according to claim 5 or 6, wherein a plurality of the suction exhaust ports connected to the dust collector are provided on the ceiling wall of the ceiling surface, and the side wall is provided on the side wall. The outside air inlet is provided, and the control means changes the direction of air flow caused by dust collection generated between the tip of the welding head and the workpiece by switching the suction exhaust port to be used. It is characterized by that.

  According to the first and fifth aspects of the present invention, the direction of the dust collection-induced flow generated between the tip of the welding head and the workpiece is controlled in consideration of the direction of the inclination of the welding head, so that the processing point By controlling the direction of the fume rising from the laser beam, it is possible to prevent the laser beam, which is a heat source for welding, from being blocked by the fume. Therefore, the laser beam, which is a welding heat source, can be stably irradiated onto the workpiece, and the welding width and the welding depth can be stabilized.

  According to the second and sixth aspects of the invention, the cause of dust collection generated between the tip of the welding head and the workpiece according to the traveling direction (processing direction) of the welding head that moves in the direction opposite to the inclination of the axis. By controlling the flow direction, the direction of the fume rising from the processing point can be controlled so that the laser light, which is a heat source for welding, is not blocked by the fume. Therefore, the laser beam, which is a welding heat source, can be stably irradiated onto the workpiece, and the welding width and the welding depth can be stabilized.

  According to the third and seventh aspects of the present invention, the direction of the dust-collecting flow generated between the tip of the welding head and the workpiece can be easily controlled by switching the outside air inlet provided on the two side walls. Therefore, it is only necessary to switch the outside air intake to be used as necessary depending on the inclination direction of the welding head and the traveling direction of the welding head.

  According to the fourth and eighth aspects of the present invention, the direction of the dust-collecting flow generated between the tip of the welding head and the workpiece is easily controlled by switching the suction / exhaust port provided in the ceiling wall. Therefore, the suction / exhaust port to be used may be switched as necessary depending on the direction of inclination of the welding head and the direction of travel of the welding head.

It is explanatory drawing of the 1st Embodiment of this invention, and is a perspective view which shows schematic structure of the welding work room by which the laser welding robot was arrange | positioned inside. The problem that the laser beam emitted from the tip of the welding head is shielded by the relationship between the inclination of the welding head and the traveling direction of the welding head when fusing with the welding head of the laser welding robot, and the fumes rising from the processing point FIG. It is a side view which shows the example of the preferable direction of the dust collection origin flow in the case of welding with the said welding head. It is a side view which shows the example (a) and (b) of the preferable direction of the dust collection origin flow in the case of welding with the said welding head, and the example (c) of an unpreferable direction. It is a figure which shows arrangement | positioning of the suction exhaust port and external air intake of the welding work room in 1st Embodiment, (a) is a perspective view, (b) is a top view. (A) is a top view which shows the direction of the dust collection origin flow inside a welding work room in the case of using a 1st outside air intake, (b) is the inside of a welding work room in the case of using a 2nd outside air intake It is a top view which shows the direction of a dust collection origin flow. It is explanatory drawing of the 2nd Embodiment of this invention, (a) is a top view which shows the direction of the dust collection origin flow inside a welding work room in the case of using the suction exhaust port arrange | positioned ahead from the middle of a room, (B) is a top view which shows the direction of the dust collection origin flow inside a welding work room in the case of using the suction exhaust port arrange | positioned on the back side from the middle of a room. FIG. 9 is an explanatory diagram of a third embodiment in which an outside air intake port is provided on the opposite side to the embodiment of FIG. 7, and (a) is an inside view of a welding work room when using a suction exhaust port arranged in front of the middle of the room The top view which shows the direction of a dust collection origin flow, (b) is a top view which shows the direction of the dust collection origin flow inside a welding work room in the case of using the suction exhaust port arrange | positioned in the rear side from the middle of a room. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram of the first embodiment, and is a perspective view showing a schematic configuration of a welding work room in which a laser welding robot is disposed. FIG. 2 is a diagram of welding when welding is performed by a welding head of a laser welding robot. It is a side view which shows the problem of the laser beam radiate | emitted from the front-end | tip of a welding head by the relationship between the inclination of a head and the advancing direction of a welding head, and the fume rising from a processing point.

  As shown in FIG. 1, the laser welding robot 40 includes a welding head 30 at the tip of an arm, and the position and posture of the welding head 30 can be freely controlled. A work table 50 is installed in front of the laser welding robot 40, and a welding operation is performed on a workpiece placed on the work table 50.

  As shown in FIG. 2, the welding head 30 has a head front side in the traveling direction E with respect to the workpiece W, a head rear side on the opposite side, and a left side and a right side when the head front side is viewed from the head rear side. When the right side is set, the axis 52 is held in a posture inclined to the head rear side by a predetermined angle θ (about 10 ° to 20 °) with respect to the line 51 perpendicular to the surface of the workpiece W. In this state, the welding head The laser beam LB is emitted toward the upper surface of the workpiece W along the axial direction from the tip of the workpiece 30, and the welding head 30 is moved in the advancing direction E while condensing the laser beam LB on the processing point Wa of the workpiece W. Predetermined welding is performed on the processing point Wa.

  Further, the welding head 30 is provided with a side nozzle 100 for injecting a shielding gas S. By supplying the shielding gas S from the side nozzle 100 to the processing point Wa in a laminar flow state, the molten part is re-solidified. Sometimes it is not oxidized.

  In some cases, the tip portion of the welding head 30 has a nozzle structure, and a laser gas is emitted from the nozzle and a shield gas is injected at the same time.

  As shown in FIG. 1, the laser welding robot 40 configured in this way is installed on the floor surface 16, and surrounds the peripheral side surface and the ceiling surface by a wall so that laser reflected light and fumes do not leak outside. It is arranged in an enclosed welding work room 10.

  That is, the four surrounding sides of the laser welding robot 40 are surrounded by the front wall 11, the rear wall 12, and the left and right side walls 13 and 14, and the ceiling surface is closed by the ceiling wall 15. The front wall 11 is provided with a door 18 for entry / exit of workers and material loading / unloading, and the door 18 is closed during operation.

  The ceiling wall 15 of the welding work room 10 is provided with a suction exhaust port 23 for forcibly exhausting the air in the welding work room 10 to the outside by a dust collector 25 for collecting dust. The left and right side walls 13 and 14 facing each other are provided with first and second outside air inlets 21 and 22 for taking in air from the outside into the room for the amount of air exhausted for dust collection. The first and second outside air inlets 21 and 22 may be provided one by one, or a plurality of first and second outside air intakes 21 and 22 may be provided.

  In the present embodiment, the suction / exhaust port 23 is disposed at a position in front of the half of the ceiling wall 15 in the front-rear direction and at an intermediate position in the horizontal width of the ceiling wall 15. Located directly above.

  Further, the first and second outside air inlets 21 and 22 are located at a position behind the half of the left and right side walls 13 and 14 in the front-rear direction and at a position below the half of the height direction. Is arranged.

  As shown in FIG. 2, when a workpiece W is placed on a work table 50 and welding is performed by irradiating the upper surface of the workpiece W with a laser beam LB from the welding head 30, the processing point (welding point) Wa is Fume F (fine metal particles generated by welding) rises. Since the welding head 30 has its axis 52 inclined to the head rear side (opposite to the traveling direction E of the welding head 30) with respect to the line 51 perpendicular to the upper surface of the workpiece W, the fume F is vertically above the machining point Wa. The laser beam LB is not so much shielded by the fume F, but the laser beam LB toward the processing point Wa may be largely shielded by the rising fume F depending on the surrounding wind direction.

  Therefore, in the present embodiment, during dust collection, a dust-collected flow (air flow resulting from dust collection) P in the direction in which the fume F is blown off is generated between the tip of the welding head 30 and the workpiece W. The air flow in the welding work room 10 is controlled by control means (not shown).

  Now, considering the dust collection-induced flow P flowing between the tip of the welding head 30 and the workpiece W, the following four directions can be considered as the directions of the dust collection-induced flow P. These intermediate directions are also conceivable. In this case, however, the direction is considered to be represented in the direction closer to the next direction.

・ "Direction from head front to head rear"
・ "Direction from head rear to head front"
・ "Direction from the left side of the head to the right side of the head"
・ "Direction from the right side of the head to the left side of the head"
Of these four directions, as shown in FIG. 3, if the dust collection-induced flow P is generated in the “direction from the head rear side to the head front side”, the fume F rising from the processing point Wa is generated from the laser beam LB. Since it moves in the direction away, the possibility that the laser beam LB is shielded by the fume F can be eliminated.

  In addition, as shown in FIGS. 4A and 4B, when the dust-collecting flow P is generated in the “direction from the left side of the head to the right side of the head” or “the direction from the right side of the head to the left side of the head”. Since the fume F moves away from the laser beam LB, the possibility that the laser beam LB is shielded by the fume F can be eliminated.

  On the other hand, as shown in FIG. 4C, when the dust collection-induced flow P is generated in the “direction from the head front side to the head rear side”, the fume F moves in a direction approaching the laser beam LB. The possibility that the light LB is shielded by the fume F increases.

  Therefore, there are three directions between the front end of the welding head 30 and the workpiece W except for the “direction from the head front side to the head rear side”, that is, “the direction from the head rear side to the head front side”, “from the left side of the head. The flow of air inside the welding work chamber 10 is controlled so that the dust collection-induced flow P is generated in either the direction toward the right side of the head or the direction from the right side of the head toward the left side of the head. By doing so, the problem of shielding the laser beam LB by the fume F can be avoided.

  As a result of the experiment, it was found that the direction of the air flow inside the welding work room 10 varies depending on the manner of dust collection. For example, the direction of the dust-collecting flow P around the welding head 30 is reversed depending on whether the first outside air inlet 21 or the second outside air inlet 22 provided in the left and right side walls 13 and 14 is used. I found out that

  Now, as shown in FIGS. 5A and 5B, the work table 50, the suction exhaust port 23, and the outside air inlets 21 and 22 are arranged, and outside air is taken in from any of the outside air inlets 21 and 22. (Flow of arrow A) An experiment was conducted on the case where the air in the welding work chamber 10 was exhausted (flow of arrow B) from the suction exhaust port 23.

  As a result, as shown in FIG. 6A, when the left first outside air inlet 21 is used, a clockwise dust collection-induced flow P is generated around the welding head. Further, as shown in FIG. 6B, it was confirmed that when the second outside air inlet 22 on the right side was used, a counterclockwise dust collecting flow P was generated around the welding head.

  Therefore, the direction of the dust-collecting flow P is any one of “a direction from the head rear side to the head front side”, “a direction from the head left side to the head right side”, and “a direction from the head right side to the head left side”. And may be controlled so as not to be in the “direction from the head front side to the head rear side”.

  In other words, according to the traveling direction E of the welding head 30, the direction of the dust collection-induced flow P between the tip of the welding head 30 and the workpiece W does not become a “direction from the head front side to the head rear side”. That is, the outside air inlets 21 and 22 to be used should be switched.

  For example, when the traveling direction of the welding head 30 is the direction from the front side to the rear side of the welding work room 10 or the direction from the rear side to the front side, the direction of the dust collection-induced flow P is as shown in FIG. 6B is also OK, but when the traveling direction of the welding head 30 is the left-right direction of the welding work room 10, it may be necessary to change the direction of the dust-collecting flow P.

  That is, when the traveling direction of the welding head 30 is the direction from the right side to the left side of the welding work room 10, it is OK because the direction of the dust collection-induced flow P is in the tailwind state when FIG. When the direction of the dust collection-induced flow P is as shown in FIG. Therefore, in that case, the used outside air intake port is changed from the second outside air intake port 22 to the first outside air intake port 21 so that the direction of the dust collection-induced flow P immediately becomes the direction of FIG. You have to switch.

  Similarly, when the traveling direction of the welding head 30 is the direction from the left side to the right side of the welding work room 10, when the direction of the dust-collecting flow P is in FIG. However, when the direction of the dust-collecting flow P is as shown in FIG. Therefore, in that case, the used outside air intake port is changed from the first outside air intake port 21 to the second outside air intake port 22 so that the direction of the dust collection-induced flow P immediately becomes the direction of FIG. You have to switch.

  Thus, by controlling the direction of the dust-collecting flow P generated between the tip of the welding head 30 and the workpiece W, the problem that the laser beam LB is blocked by the fume F can be avoided as much as possible. Therefore, the laser beam LB which is a welding heat source can be stably irradiated onto the workpiece W, and the welding width and the welding depth can be stabilized.

  Note that the shield gas S is generally discharged from the nozzle at a low flow rate so as to become a laminar flow, and even after exiting the nozzle, it prevents the outside air from being mixed and covers the welded portion with a high concentration. I can do it. Therefore, the flow rate of the dust collection-induced flow P is set to be 1/2 to 1/10 of the flow rate of the shield gas S so that the flow of the shield gas S is not blocked or disturbed. desirable. That is, since the flow rate of the shield gas S is generally 1 to 5 m / s at the nozzle tip, it is desirable to control the flow rate of the dust collection-induced flow P to be 0.5 m / s or less.

  In addition, it is known that the air flow generated by dust collection can maintain a constant flow velocity and direction in a wide range by the cross-sectional area of the outside air inlets 21 and 22 and the amount of dust collecting air flow. By switching 22, it is possible to realize an optimal airflow direction, thereby reducing variations in performance depending on the processing position.

  Next, another embodiment will be briefly described.

  In the said 1st Embodiment, the suction exhaust port 23 is provided only in one place in the ceiling wall 15, and the direction of the dust collection origin flow P is changed by switching the 1st, 2nd external air intake ports 21 and 22 to be used. However, the direction of the dust-collecting flow P can be changed by fixing the outside air suction port and switching the suction exhaust port.

  In the second embodiment shown in FIGS. 7A and 7B, the outside air inlet 21 is provided only on the left side wall 13, and the front side position and the rear side position sandwiching the half position in the front-rear direction of the ceiling wall 15 are provided. Suction / exhaust ports 23a and 23b (23) connected to the dust collector 25 are disposed in the middle of the width in the left-right direction of the ceiling wall 15.

  In this case, when the front suction / exhaust port 23a is used, a clockwise dust collection-induced flow P can be generated. Further, when the rear suction / exhaust port 23b is used, a counterclockwise dust collection flow P can be generated.

  Further, in the second embodiment of FIGS. 8A and 8B, the outside air inlet 22 is provided only on the right side wall 14, and the front side position and the rear side position sandwiching the half position of the ceiling wall 15 in the front-rear direction. In addition, suction exhaust ports 23 a and 23 b (23) connected to the dust collector 25 are arranged in the middle of the width in the left-right direction of the ceiling wall 15.

  In this case, when the front suction / exhaust port 23a is used, a counterclockwise dust collection flow P can be generated. Further, when the rear suction / exhaust port 23b is used, a clockwise dust collection-induced flow P can be generated.

  Therefore, the problem that the fume F blocks the laser beam LB can be avoided by controlling the direction of the dust-collecting flow P by switching the suction and exhaust ports 23a and 23b to be used as necessary.

  In addition, when the capacity | capacitance of the dust collector 25 deteriorates, it can be anticipated that the dust-collecting flow is kept in an optimum state by controlling the substantial flow passage area of the outside air inlets 21 and 22 with a damper or the like.

  Further, in the above embodiment, although not specifically mentioned, the welding head 30 includes a remote welding head.

  In the present specification, the term “welding” described above includes “melting” in which fume is generated.

  In the above embodiment, the head front side, the head rear side, the head left side, and the head rear side are defined on the basis of the traveling direction of the welding head 30, and the axis 51 of the welding head 30 is inclined to the head rear side. Although the direction of the dust-collecting flow P is described, the direction of the dust-collecting flow may be defined with reference to the direction in which the welding head 30 is inclined. In this case as well, the same can be said if the other direction is defined with the direction in which the welding head 30 is inclined as the head rear side for convenience.

10 Welding room 13 Left side wall (enclosure wall)
14 Right side wall (enclosure wall)
15 Ceiling wall (enclosure wall)
DESCRIPTION OF SYMBOLS 21 1st outside air inlet 22 2nd outside air inlet 23, 23a, 23b Suction exhaust port 25 Dust collector 30 Welding head 40 Laser welding robot (laser welding apparatus)
P Dust collection-induced flow W Work Wa Machining point (welding point)

Claims (8)

A laser welding device is installed inside the welding work room that has a suction exhaust port and an outside air intake port on the side wall and the ceiling surface, and collects dust in the room environment by forced exhaust from the suction exhaust port. And
When laser welding is performed by emitting laser light along the axial direction from the tip of the welding head in a posture in which the axis of the welding head of the laser welding apparatus is inclined in a certain direction with respect to a line perpendicular to the surface of the workpiece. In addition,
Collects dust between the tip of the welding head and the workpiece in a direction from the direction in which the welding head is inclined to the opposite direction, or in a direction orthogonal to the direction in which the welding head is inclined. An air flow control method in a welding work room, characterized in that the air flow in the welding work room is controlled so that the resulting air flow is generated. An airflow control method in a welding work room according to claim 1,
When the traveling direction of the welding head with respect to the workpiece is the head front side, the opposite side is the head rear side, and the left side and the right side when the head front side is viewed from the head rear side are the head left side and the head right side, respectively.
Inclining the axis of the welding head to the head rear side by a predetermined angle with respect to a line perpendicular to the surface of the workpiece,
Between the tip of the welding head and the workpiece, a direction from the head front side to the head rear side, a direction from the head rear side to the head front side, a direction from the left side of the head to the right side of the head, and a direction from the right side of the head to the left side of the head. Among the four directions, the air flow inside the welding work chamber is adjusted so that an air flow caused by dust collection is generated in any one of the three directions excluding the direction from the head front side to the head rear side. An airflow control method in a welding work room, characterized by controlling. An airflow control method in a welding work room according to claim 1 or 2,
The suction exhaust port connected to the dust collector is provided in the enclosure wall of the ceiling surface, and the outside air intake port is provided in each of the two side wall walls facing each other, and the welding head is changed by switching the outside air intake port to be used. An airflow control method in a welding work room, characterized by changing a direction of airflow caused by dust collection generated between a tip of a workpiece and a workpiece. An airflow control method in a welding work room according to claim 1 or 2,
A plurality of suction exhaust ports connected to a dust collector are provided on the ceiling wall of the ceiling surface, and the outside air intake port is provided on the side wall of the side wall. An airflow control method in a welding work room, characterized by changing a direction of airflow caused by dust collection generated between the workpiece and a workpiece. A welding work room having a suction exhaust port and an outside air intake port on a wall surrounding the side surface and the ceiling surface, and collecting dust in the room environment by forced exhaust from the suction exhaust port;
A laser welding apparatus disposed inside the welding work room,
The welding head of the laser welding apparatus emits a laser beam along the axial direction from the tip of the welding head in a posture in which the axis is inclined in a certain direction with respect to a line perpendicular to the surface of the workpiece, and the workpiece is laser welded. Configured as a thing,
In the welding work room, either the direction from the direction in which the welding head is inclined to the opposite direction or the direction orthogonal to the direction in which the welding head is inclined is provided between the tip of the welding head and the workpiece. An airflow control device in a welding work room, comprising control means for controlling the flow of air inside the welding work room so that an air flow caused by dust collection is generated in that direction. An airflow control device in a welding work room according to claim 5,
When the traveling direction of the welding head with respect to the workpiece is the head front side, the opposite side is the head rear side, and the left side and the right side when the head front side is viewed from the head rear side are the head left side and the head right side, respectively.
The axis of the welding head is inclined to the head rear side by a predetermined angle with respect to a line perpendicular to the surface of the workpiece,
The control means is
Between the tip of the welding head and the workpiece, a direction from the head front side to the head rear side, a direction from the head rear side to the head front side, a direction from the left side of the head to the right side of the head, and a direction from the right side of the head to the left side of the head. Among the four directions, the air flow inside the welding work chamber is adjusted so that an air flow caused by dust collection is generated in any one of the three directions excluding the direction from the head front side to the head rear side. An airflow control device in a welding work room characterized by controlling. An airflow control device in a welding work room according to claim 5 or 6,
The suction exhaust port connected to the dust collector is provided in the enclosure wall of the ceiling surface, the outside air intake port is provided in each of the two side wall walls facing each other, and the control means switches the outside air intake port to be used. The air flow control device in the welding work room is characterized by changing the direction of air flow caused by dust collection generated between the tip of the welding head and the workpiece. An airflow control device in a welding work room according to claim 5 or 6,
A plurality of the suction exhaust ports connected to the dust collector are provided on the ceiling wall of the ceiling surface, the outside air intake port is provided on the side wall of the side wall, and the control means switches the suction exhaust ports to be used by switching the suction exhaust ports to be used. An airflow control device in a welding work room, characterized by changing a direction of airflow caused by dust collection generated between a tip of a welding head and a workpiece.

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