Welding and welding jig monitoring system

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 Art

[0002] Welding using a laser can be used to join a state where a plate material and a plate material are laminated, or to join a state where a part of a plate material and a plate material overlap. Also, laser welding can be used to join plate materials that are extended and joined on the same surface. Laser welding can be performed manually, but when the welding process is carried out in large quantities to increase production efficiency, automatic laser welding can be performed.

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

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

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

[0006] That is, when welding is completed, the welding jig 10 rises, and the plate material on which welding has been completed can be moved to the next process. Thereafter, the plate material to be welded is conveyed to the welding position, and the welding jig 10 can be lowered to fix the plate material.

[0007] During welding of the welded joint 20, the welding jig 10 pressurizes the first plate material 1 and the second plate material 2 so that the welding line between the first plate material 1 and the second plate material 2 is included. The welding jig 10 may be positioned to surround the perimeter of the welding line. During welding of the welded joint 20, foreign matter 4 (spatter) generated during the welding process of the first plate material 1 and the second plate material 2 adheres to the welding jig 10 and prevents it from scattering onto the first plate material 1 and the second plate material 2.

[0008] On the other hand, a camera unit 30 is provided to monitor welding quality. The camera unit is configured 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 camera unit is also fixed, allowing for the capture of an image of the welding result and monitoring of welding quality.

[0009] In other words, since welding is performed automatically, monitoring systems using such imaging units are generally essential.

[0010] However, such monitoring systems only monitor welding results and are unsuitable for investigating the causes of welding defects. In other words, if a welding defect occurs, the only way to investigate the cause is retrospectively.

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

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

[0013] The conventional imaging 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 imaging unit 30 is aligned with the welded surfaces of the first plate material 1 and the second plate material 2.

[0014] Conventionally, the shooting position h2 of the camera 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 camera unit is aligned with 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 accurately photographing 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 foreign matter (spatter) generated during welding from adhering to the welding line or surrounding plate material. Therefore, the welding jig 10 can also be called a welding mask.

[0016] Referring to Figures 4 and 5, it can be seen that because the focus of the imaging unit 30 is aligned with the welded surfaces of the first plate material 1 and the second plate material 2, it is difficult to accurately confirm the state of foreign matter accumulated on the welding jig 10. Figure 4 is an image taken by the imaging unit, and Figure 5 is an actual photograph of the welding jig taken by the imaging unit.

[0017] As shown in Figure 5, foreign matter 4 can accumulate on the path of the welding beam in the welding jig 10, and it can be seen that welding defects may occur due to this foreign matter.

[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 condition of the welding jig. [Overview of the Initiative] [Problems that the invention aims to solve]

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

[0020] One embodiment of the present invention provides a welding jig foreign matter monitoring system and a method for monitoring foreign matter on a welding jig, which can focus a camera on the welding jig based on the position information of the welding jig, acquire imaging information of the welding jig, and monitor the layering state of foreign matter on the welding jig using video.

[0021] One embodiment of the present invention aims to provide a monitoring system and method that can monitor not only the welding quality but also the condition of the welding jig through a single imaging unit.

[0022] One embodiment of the present invention aims to provide a monitoring system and method that eliminates additional time wasted in the welding process by having different timings for welding quality monitoring and welding jig monitoring. [Means for solving the problem]

[0023] To achieve the aforementioned objectives, a preferred embodiment of the present invention provides a foreign matter monitoring system for a welding jig, comprising: a welding jig that pressurizes a workpiece during welding; an imaging unit that photographs the welding jig while waiting to weld the workpiece; a position adjustment unit coupled to the imaging unit and adjusting the position of the imaging unit so that the imaging focus of the imaging unit is aligned with the welding jig based on the position information of 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 present invention further includes a control unit that calculates a shooting position correction value for the initial shooting position of the shooting unit based on the 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, wherein the initial shooting position is a position in which the shooting focus of the shooting unit is aligned with the welding surface of the workpiece to be welded.

[0025] In a preferred embodiment of the present invention, when the welding jig moves from the welding surface position to the standby position for welding with respect to the welding object, the control unit calculates a shooting position correction value by reflecting the standby interval, which is the interval between the welding surface position and the standby position for welding, and the focal length of the imaging unit.

[0026] In a preferred embodiment of the present invention, the imaging unit is position-adjusted from the initial shooting position to the corrected shooting position by the position adjustment unit, and photographs the welding jig placed at the standby position for welding at the corrected shooting position and provides it to the monitoring unit. The corrected shooting position is a position separated from the initial shooting position by the shooting position correction value, and the standby position for welding is a position separated from the welding surface of the welding object by the standby interval.

[0027] In a preferred embodiment of the present invention, the monitoring unit receives the shooting information and displays it as a video image, and monitors the laminated state of foreign substances on the welding jig generated by welding the welding object.

[0028] In a preferred embodiment of the present invention, it further includes a jig lifting and lowering unit that is coupled to the welding jig and adjusts the position of the welding jig with respect to the welding surface of the welding object.

[0029] In a preferred embodiment of the present invention, during the welding operation with respect to the welding object, the jig lifting and lowering unit operates such that the welding jig descends from the standby position for welding to the welding surface position to press the welding object, and after the welding with respect to the welding object is completed, it operates to lift and lower the welding jig from the welding surface position to the standby position for welding. The welding surface position is the position of the welding surface of the welding object, and the standby position for welding is a position separated in one direction from the welding surface of the welding object.

[0030] In a preferred embodiment of the present invention, it further includes a welding unit that irradiates a welding beam along the welding line of the welding object.

[0031] In a preferred embodiment of the present invention, the welding jig is provided with a jig opening through which a welding beam passes, and is placed on the welding surface of the object to be welded such that the jig opening is located in a welding area including the welding line.

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

[0033] A preferred embodiment of the present invention provides a method for monitoring foreign matter in a welding jig, characterized by monitoring the layering state of foreign matter in the welding jig using a welding jig foreign matter monitoring system.

[0034] To achieve the aforementioned objectives, according to one embodiment of the present invention, a welding system may be provided that includes: a welding mask having an opening corresponding to a welding line and provided to surround the weld area and welding line at the top of the workpiece during welding; a camera unit that photographs the welding line after welding is completed and photographs the area around the opening of the welding mask while waiting to weld; a focus adjustment unit coupled to the camera unit that adjusts the focus of the camera 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 for welding and raises the welding mask so that it moves away from the workpiece after welding is completed; and a monitoring unit that monitors the welding state and the state of the welding mask through the photographic information of the camera unit.

[0035] When the object to be welded is fixed in place by the welding mask, the welding mask can also be called a welding jig.

[0036] This embodiment allows monitoring not only of welding quality but also of the welding mask condition. In particular, welding monitoring images and mask monitoring images can be acquired through the same imaging unit without adding an additional imaging unit.

[0037] Preferably, after the mask (welding mask) has finished descending through the mask lifting unit, welding is performed at the welding surface position h0, and after welding is completed, the welding line is photographed through the imaging unit.

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

[0039] During the welding preparation process, objects that have been welded are removed for subsequent processes, and new objects to be welded can be brought in.

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

[0041] Preferably, after the mask (welding mask) has finished rising through the mask lifting unit, the welding mask is photographed through the imaging unit.

[0042] It is preferable that the focus is automatically adjusted through the focus adjustment unit before taking a picture through the aforementioned imaging unit.

[0043] The focus set when photographing the welding line may differ from the focus when photographing the mask. In other words, because the focuses of the two are different, focus adjustment is necessary to obtain a clear image of both the welding line and the mask.

[0044] For this purpose, the focus adjustment mechanism can be set to automatically adjust the focus.

[0045] The focus adjustment unit may be configured to adjust the focus by varying the position of the imaging unit. That is, the position of the imaging unit can be varied when imaging a welding line and when imaging a mask, allowing for optimal focus in either case.

[0046] The focus adjustment unit may be provided to vary the position of the shooting unit between an initial shooting position h2 for shooting the welding line and a corrected shooting position h3 for shooting the welding mask.

[0047] It is preferable that the focus adjustment unit operates simultaneously with the operation of the mask lifting unit. More specifically, it is preferable that the focus adjustment unit operates and is completed within the operating 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 can be seen that no additional time is required between welds for focus adjustment.

[0049] Preferably, the monitoring unit is equipped to display the captured information as an image. Therefore, the monitoring operator can not only monitor the welding quality and mask condition through image analysis, but also intuitively monitor the welding quality and mask condition. [Effects of the Invention]

[0050] One embodiment of the present invention provides a welding jig foreign matter monitoring system and a method for monitoring foreign matter on a welding jig, which can focus a camera on the welding jig based on the position information of the welding jig, acquire imaging information of the welding jig, and monitor the layering state of foreign matter on the welding jig using video.

[0051] One embodiment of the present invention provides a monitoring system and method that can monitor not only the welding quality but also the condition of the welding jig through a single imaging unit.

[0052] One embodiment of the present invention provides a monitoring system and method that can eliminate additional time wasted in the welding process overall by having different timings for welding quality monitoring and welding jig monitoring. [Brief explanation of the drawing]

[0053] [Figure 1] This is a diagram illustrating the welding process for the welded joint on the workpiece. [Figure 2] This is a diagram illustrating the welding process for the welded joint on the workpiece. [Figure 3] This is a diagram illustrating the welding process for the welded joint on the workpiece. [Figure 4] This diagram illustrates the problem of difficulty in monitoring the layering state of foreign matter on welding jigs using conventional technology, based on images acquired by the camera unit. [Figure 5] This diagram illustrates the problem of difficulty in monitoring the layering state of foreign matter on welding jigs using conventional technology, based on images acquired by the camera unit. [Figure 6] This is a diagram illustrating the configuration of a foreign object monitoring system for welding jigs according to one embodiment of the present invention. [Figure 7] This diagram schematically shows the structure of a foreign matter monitoring system for a welding jig according to one embodiment of the present invention. [Figure 8] This diagram illustrates the operating state of a welding jig during welding of a welded joint in one embodiment of the present invention. [Figure 9] This diagram illustrates the operating state of the welding jig and position adjustment unit during the welding waiting period of the welded area in one embodiment of the present invention. [Figure 10] In one embodiment of the present invention, the image is captured by the camera unit. [Figure 11] This is an actual photograph of a welding jig used by the photography department during filming. [Modes for carrying out the invention]

[0054] The present invention can be modified in various ways and may have various embodiments, but a specific embodiment will be illustrated and described in the drawings.

[0055] However, this should be understood not as an attempt to limit this application to any particular embodiment, but as including all modifications, equivalents, or substitutions that fall within the concept and technical scope of this application. Where it is determined that a specific description of the relevant prior art would obscure the essence of this application, such detailed description has been omitted.

[0056] Terms such as "First," "Second," etc., can be used to describe various components, but the components should not be limited by the terms. The terms are used solely for the purpose of distinguishing one component from another.

[0057] The terms used in this application are for the sole purpose of describing specific embodiments and are not intended to limit this application. Singular expressions include plural expressions unless otherwise clearly indicated in the context.

[0058] In this application, terms such as “includes” or “having” are intended to specify the presence of features, figures, steps, actions, components, parts, or combinations thereof as described herein, and should be understood not to preemptively exclude the possibility of the presence or addition of one or more other features, figures, steps, actions, components, parts, or combinations thereof.

[0059] Therefore, the configurations shown in the embodiments described herein are merely one of the most preferred embodiments of this application and do not represent the entire technical concept of this application; there may be various equivalents and modifications that can substitute for them at the time of filing.

[0060] Furthermore, the drawings attached to this application should be understood to have been enlarged or reduced for the sake of clarity.

[0061] The following describes a preferred embodiment of the present invention: a foreign matter monitoring system for welding jigs and a method for monitoring foreign matter in welding jigs, with reference to the accompanying drawings. However, the accompanying drawings are illustrative and do not limit the scope of the foreign matter monitoring system for welding jigs and the method for monitoring foreign matter in welding jigs of this application.

[0062] Referring to Figures 6 to 9, the welding system or welding jig foreign matter monitoring system 100 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 operation of the position adjustment unit 150 and the jig lifting unit 125.

[0064] Here, the welding jig 120 can perform the function of surrounding the weld area and preventing welding debris from scattering into the surroundings. Therefore, the welding jig 120 can be called a welding mask. In this case, the jig lifting unit 125 can be called a mask lifting unit.

[0065] Furthermore, the position adjustment unit 150 may be provided to adjust the focus of the imaging unit 140. Therefore, the position adjustment unit 150 can be called a focus adjustment unit.

[0066] The welding jig 120 may be equipped to apply pressure to the objects 111 and 112 during welding to restrict their movement. The welding jig 120 is positioned by a jig lifting unit 125.

[0067] The welding jig 120 is positioned at welding surface position h0 when welding the objects 111 and 112. When the welding jig 120 is waiting to weld the objects 111 and 112, it is positioned at welding standby position h1. Welding standby position h1 is a position separated from the welding surfaces of the objects 111 and 112 by a standby interval Δh1.

[0068] In other words, the welding jig 120 is provided to move up and down 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 objects to be welded 111 and 112 are automatically transported so that a new object to be welded is positioned below the welding jig 120 and the welding area 130. Subsequently, the welding jig 120 can be lowered by the jig lifting unit 125 to perform new welding.

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

[0070] The jig opening 121 can be formed in various shapes depending on the welding position or welding line. For example, the jig opening 121 can 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 welding objects 111 and 112 according to the operating state of the welding unit 130.

[0072] The imaging unit 140 is located above the welding objects 111 and 112 and the welding jig 120. A position adjustment unit 150 may be connected to the imaging unit 140.

[0073] The position adjustment unit 150 is connected to the support unit 155 and is a device for adjusting the position of the imaging unit 140. The position adjustment unit 150 can adjust the imaging position of the imaging unit 140 so that the imaging unit 140 can focus on the object being photographed.

[0074] The initial shooting position h2 is the position where the focus of the shooting unit 140 is aligned with the welding surfaces of the welding objects 111 and 112. Therefore, in order to photograph the welding jig 120 located at the welding standby position h1, it is necessary to move the shooting position of the shooting unit 140 from the initial shooting position h2 to the corrected shooting position h3. The corrected shooting position h3 is the position where the focus of the shooting unit 140 is aligned with the welding jig 120 located at the welding standby position h1.

[0075] When the welding jig 120 moves from the welding surface position h0 to the welding standby position h1 while the welding workpiece is waiting, the control unit 170 can calculate a shooting position correction value Δh2 that reflects the standby interval Δh1, which is the distance between the welding surface position h0 and the welding standby position h1, and the focal length of the shooting unit 140.

[0076] The control unit 170 calculates the shooting position correction value Δh2 considering 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 shooting position correction value Δh2 is the interval between the initial shooting position h2 and the corrected shooting position h3.

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

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

[0079] At the corrected shooting position h3, the focus of the shooting unit 140 is aligned with the welding jig 120, and the shooting unit 140 can secure an image of the welding jig 120. The shooting unit 140 can provide the captured 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 shooting position can be very complex or difficult. If the range of change in the distance between the object and the shooting unit is already set, and very precise focus adjustment is not required, the previously set focus adjustment can be performed. Such focus adjustment can be performed simply by changing the position of the shooting unit.

[0081] The monitoring unit 160 receives the captured information and displays it as an image. Through the image displayed on the monitoring unit 160, the operator can monitor the layering and accumulation of foreign matter 114 on the welding jig 120 generated by welding the objects 111 and 112. In particular, they can monitor whether the opening is blocked by foreign matter. Of course, the welding quality and the condition of the jig can be automatically monitored through the image analysis program.

[0082] The monitoring unit 160 receives image information of the welding jig 120, including the jig opening 121, and monitors the state in which foreign matter 114 generated during the welding of the objects to be welded 111 and 112 has accumulated in the jig opening 121.

[0083] The present invention allows for the focusing of the imaging unit 140 on the welding jig 120 based on the positional information of the welding jig 120, acquiring imaging information of the welding jig 120, and monitoring the layering state of foreign matter 114 on the welding jig 120 using video.

[0084] The positions of the welding jig 120 and the imaging unit 140 in accordance with the operation of the welding jig foreign matter monitoring system 100 will be described in more detail below with reference to Figures 8 and 9.

[0085] The welding jig 120 is placed on the welding surfaces of the objects to be welded 111 and 112 such that the jig opening 121 is located in the welding area including the welding line L. At this time, the welding jig 120 pressurizes the objects to be welded 111 and 112 at the welding surface position h0. In this embodiment, the objects to be welded 111 and 112 are shown as a first object to be welded 111 and a second object to be welded 112.

[0086] The welding unit 130 irradiates the welding beam B along the welding line L of the objects to be welded 111 and 112. The welding unit 130 is a device that irradiates the objects to be welded 111 and 112 with the welding beam B. Any known type of welding device that can weld the objects to be welded 111 and 112 can be used as the welding unit 130.

[0087] The welding beam B passes through the jig opening 121 and is irradiated onto the welding line of the objects to be welded 111 and 112. The welding line is the connecting line between the first object to be welded 111 and the second object to be welded 112. By irradiating the first object to be welded 111 and the second object to be welded 112 along the welding line with welding beam B, the first object to be welded 111 and the second object to be welded 112 are connected.

[0088] Once welding of the weld joint 130 is complete, the welding jig 120 moves to the welding standby position h1, as shown in Figure 9. The welding jig 120 moves up and down from the welding surface position h0 to the welding standby position h1 by the jig lifting unit 125 (F2), separating it from the first welding object 111 and the second welding object 112.

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

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

[0091] Referring to Figures 10 and 11, it can be seen that the focus of the imaging unit 140 is set to the welding jig 120, so the condition of foreign matter accumulated on the welding jig 120 can be accurately confirmed. Figure 10 is an image taken by the imaging unit 140 in one embodiment of the present invention, and Figure 11 is an actual photograph of the welding jig 120 taken by the imaging unit 140.

[0092] The operator can check the layering state of foreign matter 114 on the welding jig 120 during the welding waiting time by viewing the captured video of the welding jig 120 displayed on the monitoring unit 160.

[0093] As a result, the worker can understand the layering state of foreign matter 114 on the welding jig 120 through the video of the welding jig 120 without having to physically inspect the welding jig 120, and can easily determine whether or not the foreign matter 114 on the welding jig 120 can be cleaned.

[0094] The present invention will be described in detail below by embodiments. However, the scope of the present invention is not limited by the following embodiments. The preferred embodiments of the present invention described above are disclosed for illustrative purposes only, and a person skilled in the art with ordinary skill in the invention will know that various modifications, changes, and additions are possible within the spirit and scope of the invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims. [Industrial applicability]

[0095] This is described in detail in the present invention.

Claims

1. A welding jig is used to pressurize the object to be welded during welding, During the waiting period for welding the object to be welded, the camera unit photographs the welding jig, A position adjustment unit is coupled to the imaging unit and adjusts the position of the imaging unit so that the imaging focus of the imaging unit is aligned with the welding jig based on the position information of the welding jig. A welding jig foreign matter monitoring system, comprising: a monitoring unit that receives imaging information from the imaging unit and monitors the state of the welding jig.

2. The system further includes a control unit that calculates a shooting position correction value for the initial shooting position of the shooting unit based on the 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, The foreign matter monitoring system for a welding jig according to claim 1, wherein the initial shooting position is a position in which the shooting focus of the shooting unit is aligned with the welding surface of the object to be welded.

3. The welding jig foreign matter monitoring system according to claim 2, wherein the control unit calculates the shooting position correction value when the welding jig moves from the welding surface position to the welding standby position during the welding standby period for the workpiece to be welded, taking into account the standby interval, which is the distance between the welding surface position and the welding standby position, and the focal length of the shooting unit.

4. The imaging unit is positioned by the position adjustment unit from the initial imaging position to the corrected imaging position, and at the corrected imaging position, it photographs the welding jig placed in the welding standby position and provides the image to the monitoring unit. The corrected shooting position is a position separated from the initial shooting position by the shooting position correction value. The welding jig foreign matter monitoring system according to claim 2, wherein the welding standby position is a position separated from the welding surface of the object to be welded by a standby interval.

5. The monitoring unit receives the captured information and displays it as a video image. The welding jig foreign matter monitoring system according to claim 4, wherein the layering state of foreign matter on the welding jig generated by welding the object to be welded 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 and adjusting the position of the welding jig with respect to the welding surface of the object to be welded.

7. The aforementioned jig lifting section is, During the welding operation on the workpiece, the welding jig is operated to descend from the welding standby position to the welding surface position and pressurize the workpiece. After welding is completed on the object to be welded, the welding jig is operated to move up and down from the welding surface position to the welding standby position. The foreign matter monitoring system for a welding jig according to claim 6, wherein the welding surface position is the position of the welding surface of the object to be welded, and the welding standby position is a position separated in one direction from the welding surface of the object to be welded.

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

9. The welding jig is provided with a jig opening through which the welding beam passes. A foreign matter monitoring system for a welding jig according to claim 8, wherein the jig is placed on the welding surface of the object to be welded such that the jig opening is located in the welding area including the welding line.

10. The welding jig foreign matter monitoring system according to claim 9, wherein the monitoring unit receives imaging information of the welding jig including the jig opening and monitors the state in which foreign matter generated during welding of the object to be welded is accumulated in the jig opening.

11. A welding mask having an opening corresponding to the welding line, which is provided above the workpiece to surround the weld area and the welding line during welding, A camera unit that photographs the welding line after welding is completed and photographs the area around the opening of the welding mask while waiting for welding to begin, A focus adjustment unit is coupled to the imaging unit and adjusts the imaging focus of the imaging unit when imaging the welding line and the welding mask. A mask lifting unit that lowers the welding mask so that it approaches the object to be welded for welding, and raises the welding mask so that it moves away from the object to be welded after welding is completed, A welding system including a monitoring unit that monitors the welding state and the state of the welding mask through the imaging information of the imaging unit.

12. The welding system according to claim 11, wherein, after the lowering of the welding mask through the mask lifting unit is completed, welding is performed at the welding surface position h0, and after the welding is completed, the welding line is photographed through the imaging unit.

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

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

15. The welding system according to claim 13, wherein, after the welding mask has been raised through the mask lifting unit, the welding mask is photographed through the imaging unit.

16. The welding system according to claim 15, wherein the focus is automatically adjusted through the focus adjustment unit before taking a photograph through the aforementioned photographic unit.

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

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

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

20. The welding system according to claim 11, wherein the monitoring unit is provided to display the captured information as an image.

Images