Welding and Welding Jig Monitoring Systems

Abstract

According to one embodiment of the present invention, there may be provided a welding system including: a welding mask having an opening corresponding to a weld line formed therein to improve welding defects caused by the welding mask, the welding mask being disposed above the workpiece to surround the weld and the weld line during welding of the workpiece; an imaging unit that photographs the weld line after welding is completed and photographs the periphery of the opening in the welding mask during welding standby; a focus adjustment unit coupled to the imaging unit that adjusts an imaging focus of the imaging unit when photographing the weld line and the welding mask; a mask elevating unit that lowers the welding mask to approach the workpiece for welding and elevates the welding mask to move away from the workpiece after welding is completed; and a monitoring unit that monitors a welding state and a state of the welding mask using imaging information from the imaging unit.

Description

[Technical Field]

[0001] The present invention relates to a welding monitoring system and method, and more particularly to a welding and welding jig monitoring system that can monitor the state of a welding jig and improve welding defects caused by the welding jig. [Background technology]

[0002] Laser welding can be used to join stacked sheets or sheets that are partially overlapping. Laser welding can also be used to join sheets that are extended on the same plane. Laser welding can be performed manually, but automated laser welding can be used to increase production efficiency and perform mass welding processes.

[0003] Spot welding can be performed using a laser, and multiple spots can be formed in a row or multiple rows of spots can be formed.

[0004] 1 to 3 show an example of conventional laser welding in which welding is performed automatically using a welding jig.

[0005] As shown in the figure, when welding a first plate material 1 and a second plate material 2 together, a welding jig 10 can be used to apply pressure to the first plate material 1 and the second plate material 2 to prevent separation between them. The welding jig 10 is moved by a lifting member 11 to a welding surface position h0 during welding, and is moved to a welding standby position h1 after welding is completed.

[0006] That is, when welding is completed, the welding jig 10 rises, and the plate material for which welding has been completed can be moved to the next process. After that, the plate material to be welded is transported to the welding position, and the welding jig 10 descends to fix the plate material.

[0007] When welding the welded portion 20, the welding jig 10 presses the first plate 1 and the second plate 2 so as to include a weld line between the first plate 1 and the second plate 2. The welding jig 10 may be provided to surround the periphery of the weld line. When welding the welded portion 20, spatter 4 generated during the welding of the first plate 1 and the second plate 2 adheres to the welding jig 10 to prevent it from scattering onto the first plate 1 and the second plate 2.

[0008] Meanwhile, a photographing unit 30 is provided to monitor the welding quality. The photographing unit is provided to photograph the welding line surrounded by the welding jig 10. Since the position of the welding line is always fixed, the focus of the photographing unit is also fixed, and the welding quality can be monitored by photographing an image of the welding result.

[0009] That is, since welding is performed automatically, it is common that a monitoring system using such an imaging unit is indispensable.

[0010] However, such monitoring systems only monitor the welding results and are not suitable for identifying the causes of welding defects. In other words, when a welding defect occurs, the cause of the welding defect can only be identified after the fact.

[0011] In particular, foreign matter 4 adhering to welding jig 10 can obstruct the movement path of welding beam B, preventing the energy of welding beam B from being transmitted to the first plate material 1 and second plate material 2, which are the workpieces to be welded, which can result in poor welding. In other words, it is not easy to monitor and remove poor welding caused by foreign matter 4 accumulated on welding jig 10 in advance.

[0012] In order to eliminate poor welding caused by the foreign matter 4 on the welding jig 10 obstructing the path of the welding beam B, a cleaning process is required to remove the foreign matter 4 from the welding jig 10 after the welding.

[0013] The conventional photographing unit 30 is used to photograph the welding state of the first plate material 1 and the second plate material 2, which are the objects to be welded, and the focus of the photographing unit 30 is adjusted to the welding surfaces of the first plate material 1 and the second plate material 2.

[0014] Conventionally, the photographing position h2 of the photographing unit was fixed, but the position of the welding jig 10 was moved from the welding surface position h0 to the welding standby position h1. Since the focus of the photographing unit was adjusted to the welding surfaces of the first plate material 1 and the second plate material 2, rather than the welding jig 10, there was a problem in that it was difficult to accurately photograph the welding jig 10 at the welding standby position h1.

[0015] The welding jig 10 is provided to surround the welding rod or welding beam B to provide a good welding environment and to prevent spatter generated during welding from adhering to the weld line or surrounding plate materials. Therefore, the welding jig 10 can also be called a welding mask.

[0016] 4 and 5, it can be seen that it is difficult to accurately confirm the state of the foreign matter stacked on the welding jig 10 because the focus of the photographing unit 30 is adjusted to the welding surface of the first plate material 1 and the second plate material 2. Fig. 4 is an image photographed by the photographing unit, and Fig. 5 is a photograph of the actual welding jig at the time of photographing by the photographing unit.

[0017] As shown in FIG. 5, foreign matter 4 can accumulate on the path of the welding beam in the welding jig 10, and it can be seen that these foreign matter can cause welding defects.

[0018] Therefore, it is necessary to provide an efficient monitoring system that can prevent welding defects by monitoring not only the welding quality but also the state of the welding jig. Summary of the Invention [Problem to be solved by the invention]

[0019] The present invention aims to solve the problems of conventional weld monitoring systems.

[0020] According to one embodiment of the present invention, there is provided a system and a method for monitoring foreign matter on a welding jig, which can focus a photographing unit on the welding jig based on position information of the welding jig, acquire photographing information of the welding jig, and monitor the stacking state of foreign matter on the welding jig through video.

[0021] According to an embodiment of the present invention, a monitoring system and method are provided that can monitor not only the welding quality but also the state of a welding jig through a single imaging unit.

[0022] According to an embodiment of the present invention, there is provided a monitoring system and method that can eliminate additional time consumption required for the welding process as a whole by differentiating the timing of welding quality monitoring from the timing of welding jig monitoring. [Means for solving the problem]

[0023] In order to achieve the above-mentioned object, a foreign matter monitoring system for a welding jig according to a preferred embodiment of the present invention is characterized by including: a welding jig that applies pressure to a workpiece to be welded when the workpiece is being welded; an imaging unit that images the welding jig when the workpiece is waiting to be welded; a position adjustment unit that is connected to the imaging unit and adjusts the position of the imaging unit based on position information of the welding jig so that the imaging focus of the imaging unit is aligned with the welding jig; and a monitoring unit that receives the imaging information (from the imaging unit) and monitors the state of the welding jig.

[0024] In a preferred embodiment of the present invention, the apparatus further includes a control unit that calculates a shooting position correction value for the initial shooting position of the shooting unit based on position information of the welding jig and controls the operation of the position adjustment unit so that the shooting unit moves from the initial shooting position by the shooting position correction value, and the initial shooting position is a position where the shooting focus of the shooting unit is aligned with the welding surface of the object to be welded.

[0025] In a preferred embodiment of the present invention, when the welding jig moves from the welding surface position to the welding standby position during standby for welding of the workpiece, the control unit calculates a shooting position correction value that reflects the standby interval, which is the interval between the welding surface position and the welding standby position, and the focal length of the shooting unit.

[0026] In a preferred embodiment of the present invention, the photographing unit is adjusted by the position adjusting unit from the initial photographing position to a corrected photographing position, and photographs the welding jig placed at the welding standby position at the corrected photographing position and provides the photograph to the monitoring unit, wherein the corrected photographing position is a position spaced apart from the initial photographing position by a photographing position correction value, and the welding standby position is a position spaced apart from the welding surface of the workpiece by a standby interval.

[0027] In a preferred embodiment of the present invention, the monitoring unit receives the photographic information and displays it as a video image, thereby monitoring the accumulation of foreign matter on the welding jig caused by welding the workpiece.

[0028] In a preferred embodiment of the present invention, the welding jig further includes a jig lifting unit coupled to the welding jig for adjusting the position of the welding jig relative to the welding surface of the workpiece.

[0029] In a preferred embodiment of the present invention, the jig lifting unit operates to lower the welding jig from a welding standby position to a welding surface position to apply pressure to the workpiece during welding of the workpiece, and to lift and lower the welding jig from the welding surface position to the welding standby position after welding of the workpiece is completed, the welding surface position being the position of the welding surface of the workpiece, and the welding standby position being a position spaced apart in one direction from the welding surface of the workpiece.

[0030] In a preferred embodiment of the present invention, the welding apparatus further includes a welding section that irradiates a welding beam along a welding line of the object to be welded.

[0031] In a preferred embodiment of the present invention, the welding jig is characterized in that it has a jig opening through which the welding beam passes, and is placed on the welding surface of the object to be welded so that the jig opening is positioned in the welding area including the weld line.

[0032] In a preferred embodiment of the present invention, the monitoring unit receives photographic information of a welding jig including a jig opening, and monitors the state of foreign matter generated during welding of the workpiece and accumulated in the jig opening.

[0033] A method for monitoring foreign matter in a welding jig according to a preferred embodiment of the present invention is characterized in that it monitors the stacking state of foreign matter in a welding jig using a foreign matter monitoring system for a welding jig.

[0034] In order to achieve the above-mentioned object, according to one embodiment of the present invention, there may be provided a welding system including: a welding mask having an opening corresponding to a weld line formed therein and disposed above a workpiece to surround the weld and the weld line during welding of the workpiece; an imaging unit that photographs the weld line after welding is completed and photographs the periphery of the opening in the welding mask during welding standby; a focus adjustment unit coupled to the imaging unit that adjusts the imaging focus of the imaging unit when photographing the weld line and the welding mask; a mask elevating unit that lowers the welding mask to approach the workpiece for welding and elevates the welding mask to move away from the workpiece after welding is completed; and a monitoring unit that monitors a welding status and a welding mask status using imaging information from the imaging unit.

[0035] When the welding mask fixes the workpieces to be welded, the welding mask may also be called a welding jig.

[0036] According to this embodiment, not only the welding quality but also the state of the welding mask can be monitored. In particular, the welding monitoring image and the mask monitoring image can be acquired through the same imaging unit without the need for an additional imaging unit.

[0037] After the mask (welding mask) has been lowered by the mask lifting unit, welding is performed at the welding surface position h0, and after the welding is completed, it is preferable that the welding line be photographed by the photographing unit.

[0038] After the photographing of the welding line is completed, it is preferable to raise the mask by the mask lifting unit and prepare for a new welding at the welding standby position h1.

[0039] In the welding preparation process, the object that has been completely welded can be removed for a subsequent process, and a new object to be welded can be brought in.

[0040] It is preferable that the welding surface position and the welding standby position are preset.

[0041] It is preferable that after the mask (welding mask) has been lifted by the mask lifting unit, the welding mask is photographed by the photographing unit.

[0042] It is preferable that the focus is automatically adjusted through the focus adjustment unit before photographing through the photographing unit.

[0043] The focus when photographing the weld line may be different from the focus when photographing the mask, meaning that focus adjustment is required to obtain a clear image of both the weld line and the mask.

[0044] For this reason, the focus can be automatically adjusted by the focus adjustment unit.

[0045] The focus adjustment unit may be configured to adjust the focus by varying the position of the photographing unit, i.e., by varying the position of the photographing unit when photographing the welding line and the position of the photographing unit when photographing the mask, it is possible to achieve an optimal focus in either case.

[0046] The focus adjustment unit may be configured to change the position of the image capture unit between an initial image capture position h2 for capturing an image of the weld line and a corrected image capture position h3 for capturing an image of the welding mask.

[0047] It is preferable that the operation of the focus adjustment unit be performed simultaneously with the operation of the mask lifting unit. More specifically, it is preferable that the operation of the focus adjustment unit be completed within the operation period of the mask lifting unit. This means that no additional time is required for the operation of the focus adjustment unit.

[0048] Therefore, it is understood that additional time required for focus adjustment between welding operations is not required.

[0049] The monitoring unit is preferably configured to display the photographed information as an image, so that a monitoring operator can not only monitor the welding quality and the mask state by image analysis but also intuitively monitor the welding quality and the mask state. [Effects of the Invention]

[0050] According to one embodiment of the present invention, a system and a method for monitoring foreign matter on a welding jig can be provided that can focus a camera on the welding jig based on position information of the welding jig, acquire shooting information of the welding jig, and monitor the stacking state of foreign matter on the welding jig using video.

[0051] According to an embodiment of the present invention, a monitoring system and method can be provided that can monitor not only the welding quality but also the state of a welding jig through a single imaging unit.

[0052] According to an embodiment of the present invention, a monitoring system and method can be provided that can separate the timing of welding quality monitoring from the timing of welding jig monitoring, thereby eliminating additional time wastage required for the welding process as a whole. [Brief explanation of the drawings]

[0053] [Figure 1] 1 is a diagram for explaining a welding process of a welded portion on an object to be welded; [Figure 2] 1 is a diagram for explaining a welding process of a welded portion on an object to be welded; [Figure 3] 1 is a diagram for explaining a welding process of a welded portion on an object to be welded; [Figure 4] 10A and 10B are diagrams illustrating a problem that it is difficult to monitor the state of foreign matter stacking on a welding jig through an image acquired by a photographing unit in the prior art. [Figure 5] 10A and 10B are diagrams illustrating a problem that it is difficult to monitor the state of foreign matter stacking on a welding jig through an image acquired by a photographing unit in the prior art. [Figure 6] 1 is a configuration diagram of a foreign matter monitoring system for a welding jig according to an embodiment of the present invention; [Figure 7] 1 is a diagram illustrating a schematic structural view of a foreign object monitoring system for a welding jig according to an embodiment of the present invention; [Figure 8] 10A to 10C are diagrams illustrating an operating state of a welding jig during welding of a welded portion in one embodiment of the present invention. [Figure 9] 10A and 10B are diagrams for explaining the operating states of the welding jig and the position adjustment unit when the welding portion is on standby for welding in one embodiment of the present invention. [Figure 10] In one embodiment of the present invention, an image captured by a capturing unit is [Figure 11] This is a photo of the actual welding jig used during the photo shoot. DETAILED DESCRIPTION OF THE INVENTION

[0054] While the present invention may be modified in various ways and may have various embodiments, specific embodiments will be described by way of example in the drawings.

[0055] However, this is not intended to limit the present application to a particular embodiment, and should be understood to include all modifications, equivalents, or alternatives falling within the spirit and technical scope of the present application. In describing the present application, if it is determined that a detailed description of related publicly known technology may obscure the gist of the present application, the detailed description will be omitted.

[0056] Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by the terms. Terms are used only to distinguish one component from another.

[0057] The terms used in this application are merely used to describe particular embodiments and are not intended to limit the scope of this application. The singular expressions include the plural expressions unless otherwise clearly indicated in the context.

[0058] In this application, the use of terms such as "comprise" or "have" is intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described herein, and should be understood as not precluding the possible presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0059] Therefore, the configurations shown in the embodiments described in this specification are merely the most preferred embodiments of the present application and do not represent the entire technical idea of the present application, and therefore there may be various equivalents and modifications that can replace them at the time of this application.

[0060] It should also be understood that the drawings attached in this application have been drawn to scale for the convenience of explanation.

[0061] Hereinafter, a welding jig foreign matter monitoring system and a welding jig foreign matter monitoring method according to preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the accompanying drawings are for illustrative purposes only and do not limit the scope of the welding jig foreign matter monitoring system and welding jig foreign matter monitoring method of the present application.

[0062] 6 to 9, a foreign matter monitoring system 100 for a welding system or welding jig may include a welding jig 120, a jig lifting unit 125, a welding unit 130, an imaging unit 140, a position adjustment unit 150, and a monitoring unit 160. The foreign matter monitoring system 100 may include a control unit 170 that controls the timing of imaging by the imaging unit 140.

[0063] The control unit 170 may be configured to control the operations of the position adjustment unit 150 and the jig lifting unit 125 .

[0064] Here, the welding jig 120 may function to surround the welded portion and prevent welding debris from scattering around. Therefore, the welding jig 120 may be called a welding mask. In this case, the jig lifting unit 125 may be called a mask lifting unit.

[0065] The position adjusting unit 150 may also be configured to adjust the focus of the photographing unit 140. Therefore, the position adjusting unit 150 may be called a focus adjusting unit.

[0066] The welding jig 120 may be provided to apply pressure to the welding workpieces 111, 112 during welding to restrict movement of the welding workpieces 111, 112. The position of the welding jig 120 is adjusted by a jig lifting unit 125.

[0067] The welding jig 120 is positioned at a welding surface position h0 when welding the workpieces 111 and 112. The welding jig 120 is positioned at a welding standby position h1 when waiting to weld the workpieces 111 and 112. The welding standby position h1 is a position separated from the welding surfaces of the workpieces 111 and 112 by a standby distance Δh1.

[0068] That is, the welding jig 120 is configured to be raised and lowered by the operation of the jig lifting unit 125, and the timing of the lifting and lowering can be controlled by the control unit 170. When welding is completed, the workpieces 111 and 112 are automatically transported, and a new workpiece is positioned below the welding jig 120 and welding unit 130. Thereafter, the welding jig 120 is lowered by the jig lifting unit 125, and a new welding can be performed.

[0069] The welding jig 120 is provided with a jig opening 121 through which the welding beam B passes. The support lifting unit is coupled to the welding jig 120 and can move the welding jig 120 downward in the direction of arrow F1 toward the objects to be welded 111, 112, or upward and downward in the direction of arrow F2 away from the objects to be welded 111, 112.

[0070] The jig opening 121 may be formed in various shapes depending on the welding position or welding line. For example, the jig opening 121 may be formed in the shape of a slit that is elongated in the width direction of the workpiece to be welded.

[0071] The jig lifting unit 125 can adjust the position of the welding jig 120 relative to the workpieces 111 and 112 to be welded according to the operating state of the welding unit 130 .

[0072] The photographing unit 140 is located above the welding workpieces 111 and 112 and the welding jig 120. A position adjusting unit 150 may be coupled to the photographing unit 140.

[0073] The position adjustment unit 150 is a device coupled to the support unit 155 and adjusts the position of the photographing unit 140. The position adjustment unit 150 can adjust the photographing position of the photographing unit 140 so that the photographing target of the photographing unit 140 is in focus.

[0074] Initial photographing position h2 is a position where the focal point of photographing unit 140 is adjusted to the welding surfaces of workpieces 111 and 112. Therefore, in order to photograph welding jig 120 positioned at welding standby position h1, it is necessary to move the photographing position of photographing unit 140 from initial photographing position h2 to corrected photographing position h3. Corrected photographing position h3 is a position where the focal point of photographing unit 140 is adjusted to welding jig 120 positioned at welding standby position h1.

[0075] When the welding jig 120 moves from the welding surface position h0 to the welding standby position h1 during standby for welding of the workpiece, the control unit 170 can calculate the photographing position correction value Δh2 by reflecting the standby interval Δh1, which is the interval between the welding surface position h0 and the welding standby position h1, and the focal length of the photographing unit 140.

[0076] The control unit 170 calculates the photographing position correction value Δh2 taking into account the standby interval Δh1. Here, the standby interval Δh1 is the interval between the welding surface position h0 and the welding standby position h1. The photographing position correction value Δh2 is the interval between the initial photographing position h2 and the corrected photographing position h3.

[0077] When the control unit 170 calculates the photographing position correction value Δh2, the control unit 170 controls the operation of the position adjustment unit 150 so that the photographing unit 140 moves from the initial photographing position h2 by the photographing position correction value Δh2. As a result, the photographing unit 140 is positioned at a distance equal to the focal length from the welding jig 120, which is positioned at the welding standby position h1.

[0078] When the photographing unit 140 is positioned at the corrected photographing position h3, it can photograph the welding jig 120 positioned at the welding standby position h1.

[0079] The focus of the photographing unit 140 at the corrected photographing position h3 is adjusted to the welding jig 120, and the photographing unit 140 can obtain an image of the welding jig 120. The photographing unit 140 can provide the photographed image of the welding jig 120 to the monitoring unit 160.

[0080] On the other hand, automatically adjusting the focal length by calculating a correction value for the imaging position can be very complicated or difficult. If the range of change in the distance between the object and the imaging unit is already set and very precise focus adjustment is not required, a pre-set focus adjustment can be performed. Such focus adjustment can be performed simply by changing the position of the imaging unit.

[0081] The monitoring unit 160 receives the photographed information and displays it as an image. Through the image displayed on the monitoring unit 160, the worker can monitor the accumulation or stacking of foreign matter 114 on the welding jig 120 that occurs during the welding of the workpieces 111 and 112. In particular, the worker can monitor whether the opening is blocked by foreign matter. Of course, the welding quality and the state of the jig can be automatically monitored through an image analysis program.

[0082] The monitoring unit 160 receives imaging information of the welding jig 120 including the jig opening 121 and monitors the state in which foreign matter 114 generated during welding of the workpieces 111 and 112 is piled up in the jig opening 121 .

[0083] The present invention can focus the imaging unit 140 on the welding jig 120 based on the position information of the welding jig 120, obtain imaging information of the welding jig 120, and monitor the stacking state of the foreign matter 114 on the welding jig 120 on video.

[0084] The positions of the welding jig 120 and the photographing unit 140 according to the operation of the welding jig foreign matter monitoring system 100 will be described in more detail below with reference to FIGS.

[0085] Welding jig 120 is placed on the welding surfaces of the workpieces 111 and 112 so that jig opening 121 is positioned in a welding area including weld line L. At this time, welding jig 120 applies pressure to the workpieces 111 and 112 at welding surface position h0. In this embodiment, the workpieces 111 and 112 are shown divided into a first workpiece 111 and a second workpiece 112.

[0086] Welding unit 130 irradiates welding beam B along welding line L on objects 111 and 112. Welding unit 130 is a device that irradiates objects 111 and 112 with welding beam B. Welding unit 130 can be any of various known welding devices as long as it is a device that can weld objects 111 and 112 together.

[0087] Welding beam B passes through jig opening 121 and is irradiated onto the welding line between workpieces 111 and 112. The welding line is a connecting line between first workpiece 111 and second workpiece 112. As welding beam B is irradiated onto first workpiece 111 and second workpiece 112 along the welding line, first workpiece 111 and second workpiece 112 are connected together.

[0088] When welding of the welded portion 130 is completed, the welding jig 120 moves to a welding standby position h1, as shown in Fig. 9. The welding jig 120 is separated from the first work-piece to be welded 111 and the second work-piece to be welded 112 while being raised and lowered by the jig lifting unit 125 from the welding surface position h0 to the welding standby position h1 (F2).

[0089] When the welding jig 120 moves to the standby position, the photographing unit 140 is moved by the position adjusting unit 150 to a focal distance that focuses on the welding jig 120. That is, the photographing unit 140 is positioned at a distance equal to the focal distance from the welding jig 120.

[0090] The position adjustment unit 150 adjusts the position of the photographing unit 140 so that the photographing unit 140 is spaced apart from the welding jig 120 by the focal length for the welding jig 120 calculated based on the position information of the welding jig 120. As a result, the photographing unit 140 moves from the initial photographing position h2 to the corrected photographing position h3.

[0091] 10 and 11, it can be seen that the focus of the photographing unit 140 is adjusted to the welding jig 120, so that the state of the foreign matter stacked on the welding jig 120 can be accurately confirmed. Fig. 10 is an image photographed by the photographing unit 140 in one embodiment of the present invention, and Fig. 11 is a photograph of the actual welding jig 120 when photographed by the photographing unit 140.

[0092] The worker can check the state of the foreign matter 114 on the welding jig 120 during the waiting time for welding through the captured image of the welding jig 120 displayed on the monitoring unit 160.

[0093] This allows the worker to understand the stacking state of the foreign matter 114 on the welding jig 120 through the image of the welding jig 120 without having to check the actual welding jig 120, and can easily determine whether the foreign matter 114 on the welding jig 120 can be cleaned.

[0094] The present invention will be described in detail below with reference to the following embodiments. However, the scope of the present invention is not limited to the following embodiments. The preferred embodiments of the present invention described above are disclosed for illustrative purposes, and those skilled in the art with ordinary skill in the art may make various modifications, changes, and additions within the spirit and scope of the present invention. Such modifications, changes, and additions should be considered to fall within the scope of the following claims. [Industrial Applicability]

[0095] This is described in the detailed description of the invention.

Claims

1. a welding jig that applies pressure to an object to be welded when welding the object to be welded; an imaging unit that images the welding jig while waiting for welding of the workpiece; a position adjustment unit coupled to the photographing unit and configured to adjust the position of the photographing unit based on position information of the welding jig so that the photographing focus of the photographing unit is aligned with the welding jig; a monitoring unit that receives photographing information from the photographing unit and monitors the state of the welding jig.

2. a control unit that calculates a photographing position correction value for an initial photographing position of the photographing unit based on position information of the welding jig, and controls the operation of the position adjustment unit so that the photographing unit moves from the initial photographing position by the photographing position correction value; 2. The welding jig foreign matter monitoring system according to claim 1, wherein the initial photographing position is a position where the photographing focus of the photographing unit is aligned with the welding surface of the workpiece.

3. 3. The welding jig foreign matter monitoring system according to claim 2, wherein when the welding jig moves from a welding surface position to a welding standby position during a standby state for welding of the workpiece, the control unit calculates the photographing position correction value by reflecting a standby interval, which is an interval between the welding surface position and the welding standby position, and a focal length of the photographing unit.

4. the photographing unit is adjusted by the position adjusting unit from the initial photographing position to a corrected photographing position, photographs the welding jig placed at a welding standby position at the corrected photographing position, and provides the photograph to the monitoring unit; the corrected photographing position is a position spaced apart from the initial photographing position by the photographing position correction value, 3. The foreign matter monitoring system for a welding jig according to claim 2, wherein the welding standby position is a position spaced apart from the welding surface of the workpiece by a standby distance.

5. The monitoring unit receives the photographing information and displays it as a video image; 5. The welding jig foreign matter monitoring system according to claim 4, wherein a state of accumulation of foreign matter on the welding jig caused by welding of the welding object is monitored.

6. The welding jig foreign matter monitoring system according to claim 1 , further comprising a jig lifting unit coupled to the welding jig for adjusting a position of the welding jig relative to the welding surface of the workpiece.

7. The jig lifting unit is During a welding operation on the welding object, the welding jig descends from a welding standby position to a welding surface position to pressurize the welding object; After completion of welding of the workpiece, the welding jig is raised and lowered from the welding surface position to the welding standby position; 7. The foreign matter monitoring system for a welding jig according to claim 6, wherein the welding surface position is a position of the welding surface of the welding object, and the welding standby position is a position spaced apart in one direction from the welding surface of the welding object.

8. The welding jig foreign matter monitoring system according to claim 1 , further comprising a welding section that irradiates a welding beam along a welding line of the welding object.

9. the welding jig is provided with a jig opening through which the welding beam passes; The welding jig foreign object monitoring system according to claim 8, wherein the jig is placed on the welding surface of the workpiece so that the jig opening is positioned in a welding area including the weld line.

10. 10. The welding jig foreign matter monitoring system of claim 9, wherein the monitoring unit receives photographic information of the welding jig including the jig opening, and monitors the state of foreign matter generated during welding of the welding object and accumulated in the jig opening.

11. a welding mask having openings corresponding to the welding lines and provided on an upper portion of the workpiece to surround the weld and the welding lines when welding the workpiece; an imaging unit that photographs the welding line after welding is completed and photographs the periphery of the opening of the welding mask during welding standby; a focus adjusting unit coupled to the photographing unit and configured to adjust a photographing focus of the photographing unit when photographing the welding line and the welding mask; a mask lifting unit that lowers the welding mask so that it approaches the workpiece during welding and lifts the welding mask so that it moves away from the workpiece after welding is completed; a monitoring unit that monitors the welding state and the state of the welding mask based on the photographed information of the photographing unit.

12. 12. The welding system according to claim 11, wherein after the lowering of the welding mask is completed by the mask lifting unit, welding is performed at a welding surface position h0, and after the welding is completed, an image of the welding line is taken by the image taking unit.

13. The welding system according to claim 12, wherein after the photographing of the welding line is completed, the welding mask is raised by the mask lifting unit to prepare for a new welding at a welding standby position h1.

14. The welding system according to claim 13 , wherein the welding surface position and the welding standby position are preset.

15. The welding system according to claim 13 , wherein after the mask lifting unit has completed lifting of the welding mask, the image capturing unit captures an image of the welding mask.

16. The welding system according to claim 15, wherein the focus is automatically adjusted through the focus adjustment unit before photographing through the photographing unit.

17. The welding system according to claim 16, wherein the focus adjustment unit is configured to adjust the focus by varying the position of the photographing unit.

18. 18. The welding system according to claim 17, wherein the focus adjustment unit is configured to change the position of the photographing unit between an initial photographing position h2 for photographing the welding line and a corrected photographing position h3 for photographing the welding mask.

19. The welding system according to claim 18 , wherein the focus adjustment unit simultaneously operates the mask lifting unit and the focus adjustment unit.

20. The welding system of claim 11 , wherein the monitoring unit is configured to display the photographed information as an image.

Images