CN111266684B - Laser filler wire welding bare wire centering monitoring method, bare wire centering monitoring device and laser filler wire welding device - Google Patents
Laser filler wire welding bare wire centering monitoring method, bare wire centering monitoring device and laser filler wire welding device Download PDFInfo
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- CN111266684B CN111266684B CN202010166251.2A CN202010166251A CN111266684B CN 111266684 B CN111266684 B CN 111266684B CN 202010166251 A CN202010166251 A CN 202010166251A CN 111266684 B CN111266684 B CN 111266684B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/005—Soldering by means of radiant energy
- B23K1/0053—Soldering by means of radiant energy soldering by means of I.R.
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
- B23K3/063—Solder feeding devices for wire feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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Abstract
The invention discloses a laser filler wire welding bare wire centering monitoring method, a bare wire centering monitoring device and a laser filler wire welding device, which comprise the following steps: s1, mounting a laser head and a wire feeding mechanism; s2, forming a top view imaging visual field, wherein the top view imaging visual field is provided with orthogonal transverse scale marks and longitudinal scale marks, and the intersection is coincided with the center of the laser beam; s3, displaying the overlook imaging view and the acquired image information of the welding wire, and recording transverse scales and longitudinal scales; s4, after the welding cycle is started, recording the transverse scale and the longitudinal scale at a certain moment in the process of the welding cycle; and S5, generating an alarm signal when the first preset condition and/or the second preset condition are met so as to complete the light wire centering monitoring of the welding cycle. The invention has simple structure design and method steps, can realize the monitoring of the centering degree of the light wire in each welding cycle and generates an alarm signal.
Description
Technical Field
The invention relates to the field of laser welding, in particular to a smooth wire centering monitoring method, a smooth wire centering monitoring device and a laser wire filling welding device for laser wire filling welding.
Background
Laser welding has been increasingly applied to industries such as automobile, 3C, engineering machinery, ship manufacturing and the like because of its advantages of high power density, fast processing speed, good processing effect, high automation degree and the like. But it has strict requirements on preparation before welding, especially on assembly clearance, otherwise it affects the welding quality.
The laser filler wire welding method can improve the burning loss of metal elements in welding seams, has a better metallurgical effect, further can better reduce the requirement on assembly clearance, and greatly improves the application range of laser welding. However, in laser filler wire welding, the alignment of laser filler wire welding and laser (i.e., "plain wire alignment") greatly affects the fit of plain wires, and thus affects the quality of the weld and the welding production efficiency. For example, when the welding wire is misaligned with the optical position due to thermal deformation, initial state wire cutting stress, last cycle wire breakage and pulling, and the like, the stability of subsequent automatic welding is greatly influenced.
Therefore, in the automatic production, a method/device capable of monitoring the light wire centering condition on line and giving an alarm to prompt the manual inspection of the welding quality is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bare wire centering monitoring method, a bare wire centering monitoring device and a laser bare wire welding device for laser bare wire welding, which have simple structural design and method steps, can realize monitoring of the bare wire centering degree in each welding cycle, and generate an alarm signal.
In order to achieve the purpose, the invention provides the following technical scheme:
on one hand, the method for monitoring the laser filler wire welding bare wire centering comprises the following steps:
s1, mounting a laser head and a wire feeding mechanism;
s2, forming a top view imaging visual field, wherein the top view imaging visual field is provided with orthogonal transverse scale marks and longitudinal scale marks, and the intersection is coincided with the center of the laser beam;
s3, displaying image information of the welding wire which is overlooked imaging view and crossed with the transverse scale mark and the longitudinal scale mark of the overlooked imaging view, and recording a first transverse scale x1 at the crossed position of the end of the welding wire and the transverse scale mark before a certain welding cycle starts, and a first longitudinal scale y1 at the crossed position of the upper profile of the welding wire and the longitudinal scale mark/a first longitudinal scale y 1' at the crossed position of the lower profile of the welding wire and the longitudinal scale mark;
S4, after the welding circulation is started, the center of the laser beam is ensured to be always coincident with the intersection point; and recording a second transverse scale x2 at the intersection of the end of the welding wire and the transverse scale line and a second longitudinal scale y2 at the intersection of the upper profile of the welding wire and the longitudinal scale line/a second longitudinal scale y2' at the intersection of the lower profile of the welding wire and the longitudinal scale line at a certain moment in the process of the welding cycle;
and S5, generating an alarm signal when the first preset condition and/or the second preset condition are met so as to complete the light wire centering monitoring of the welding cycle.
Preferably, step S3 further includes: before the first transverse scale and the first longitudinal scale are recorded, the position of the welding wire is adjusted, so that the central axis of the welding wire is overlapped/parallel with the transverse scale line in the overlooking imaging visual field.
Preferably, in step S5, the first preset condition is | y0| ≦ tan5 ° · | x0|, and y0 is a middle value of the first longitudinal scale y1, the second longitudinal scale y2, or a middle value of the first longitudinal scale y1', the second longitudinal scale y 2'; the x0 is the middle value of the first transverse scale x1 and the second transverse scale x 2.
Preferably, in step S5, the second preset condition is | | y1| - | y1'| | ≦ preset value, or | | | y2| - | y2' | ≦ preset value.
Preferably, the method for monitoring the centering of the optical fiber further comprises the following steps:
and S6, if no alarm signal is generated in the light wire centering monitoring of the welding cycle and the third condition is met, the wire cutting is not needed in the next welding cycle.
Preferably, the third preset condition is
Or
x3 is the third transverse scale x3 at the intersection of the wire end and the transverse scale line after the cycle of welding is completed.
On the other hand, an optical fiber centering monitoring device for implementing the optical fiber centering monitoring method is also provided, which includes:
the imaging unit is connected with the laser head and is used for forming a overlooking imaging visual field and acquiring image information of the welding wire, the overlooking imaging visual field is provided with orthogonal transverse scale marks and longitudinal scale marks, and the intersection point is superposed with the center of the laser beam;
the display is connected with the imaging unit and used for displaying the overlooking imaging visual field and the image information of the welding wire crossed with the transverse scale mark and the longitudinal scale mark of the overlooking imaging visual field so as to obtain the transverse scale mark at the crossed part of the end of the welding wire and the transverse scale mark before starting a certain welding cycle and/or in the process of welding and/or after the welding is finished and the longitudinal scale mark at the crossed part of the welding wire and the longitudinal scale mark before starting the corresponding welding cycle and/or in the process of welding;
And the control system is used for calculating according to the acquired transverse scale and longitudinal scale, and generating an alarm signal when a calculation result meets a first preset condition and/or a second preset condition, and/or generating a prompt signal that wire cutting is not needed in the next welding cycle when the calculation result meets a third preset condition.
Preferably, the optical fiber centering monitoring device further comprises: and the alarm device is connected with the control system and is used for generating alarm information according to the alarm signal (and/or generating prompt information according to the prompt signal).
In addition, still provide a laser filler wire welding device, it includes: a laser head for emitting a laser beam; a wire feeder for feeding a welding wire; and the optical fiber centering monitoring device.
Preferably, the included angle alpha formed by the outgoing direction of the laser beam generated by the laser head and the welding wire to be conveyed is 30-60.
Compared with the prior art, the invention has the following beneficial effects:
the invention has simple working principle and low requirement on equipment, can realize the monitoring of the centering degree of the optical wire in each welding cycle only by acquiring overlooking imaging visual field and an image of the welding wire, and generates an alarm signal when the condition is met so as to inform an operator of adjusting the position of the welding wire in advance and ensure the timeliness of a production line; meanwhile, whether wire cutting is needed or not can be determined through the change of the position of the end of the welding wire after welding is finished, so that the number of automatic wire cutting in continuous production is reduced, and the continuity of production beats is ensured.
Drawings
FIG. 1 is an overall configuration view of a laser filler wire welding apparatus according to the present invention;
FIG. 2 is a schematic diagram of the first transverse scale x1, the first longitudinal scale y 1/the first longitudinal scale y 1' in a top imaging view of the present invention;
FIG. 3 is a schematic diagram of the second transverse scale x2, the second longitudinal scale y 2/the second longitudinal scale y 2' in a top imaging view of the present invention;
fig. 4 is a schematic diagram of the third transverse scale x3 in the top imaging view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a method for monitoring the centering of a laser filler wire welding bare wire, which includes the following steps:
s1, mounting the laser head 1 and the wire feeding mechanism 2, and enabling an included angle alpha formed by the outgoing direction of a laser beam 100 emitted by the laser head 1 and a welding wire L fed by the wire feeding mechanism 2 to be 30-60 degrees; specifically, the laser head 1 includes: an incident portion and an exit portion, wherein the incident portion includes: an optical coupler 11, a first lens 12, and a first mirror 13; the emission part includes: the lens comprises a shell 21, a second reflector 22 and a second lens 23, wherein the second reflector 22 and the second lens 23 are arranged in the shell 21; the laser beam 100 sequentially passes through the optocoupler 11, the first lens 12 and the first reflector 13, is reflected into the shell 21 of the emergent part, and then sequentially passes through the second reflector 22 and the second lens 23 for focusing, and then is emitted;
S2, as shown in fig. 2a, forming a top view imaging field S and acquiring image information of the welding wire L by the imaging unit 3, wherein the top view imaging field S has a transverse scale line X and a longitudinal scale line Y which are orthogonal to each other, and an intersection point is a point O; and the intersection O coincides with the center of the laser beam 100 by adjusting the position of the imaging unit 3 and/or the laser beam 100;
it should be noted that, because the laser beam 100 itself is invisible, when the laser leaves the factory, the center of the laser beam 100 and the center of the spot of the guiding beam (e.g., other visible light such as guiding red light) are adjusted to coincide, for example, the laser can be used to dot on the photosensitive paper, and then compared with the guiding red light for calibration, so as to ensure that the center of the laser beam 100 is accurately located at a predetermined position, and then the spot of the guiding beam is used as the laser spot P for field debugging, so that the laser spot P in this embodiment is actually the spot of the guiding beam, and the wavelength of the laser beam 100 is 800-1100 nm, the guiding beam is the guiding red light, and the wavelength is 622-770 nm, and further, the intersection point O of the overlooking imaging field of view S can coincide with the center of the laser beam 100 by adjusting the position of the imaging unit 3 and/or the laser spot P;
In this embodiment, the imaging unit 3 is connected to the housing 21 of the emitting part of the laser head 1 and is coaxially arranged with the emitting part, so that the positions of the imaging unit 3 and the laser spot P can be quickly and simply adjusted, and the coincidence of the intersection point O in the overlooking imaging field of view S and the center of the laser beam 100 is ensured; preferably, the imaging unit 3 includes: CCD image sensors, imaging lenses, etc.;
s3, as shown in fig. 2b, the guiding beam is removed, so that the laser spot P does not appear (because the laser spot P is not needed in the actual welding process), and because the intersection point O coincides with the midpoint of the laser spot P in step S2, the intersection point O is also the center of the laser beam 100 at the same time;
adjusting the position of the welding wire L under the overlooking imaging field S to enable the welding wire L to be crossed with a transverse scale mark X and a longitudinal scale mark Y of the overlooking imaging field S, sending the overlooking imaging field S and the acquired image information of the welding wire L crossed with the transverse scale mark X and the longitudinal scale mark Y of the overlooking imaging field S to a display 4 for synchronous display, and recording a first transverse scale X1 at the crossed part of a welding wire end L1 and the transverse scale mark X before a certain welding cycle starts, and a first longitudinal scale Y1 at the crossed part of an upper profile D1 of the welding wire L and the longitudinal scale mark Y/a first longitudinal scale Y1 'at the crossed part of a lower profile D1' of the welding wire L and the longitudinal scale mark Y; the welding wire end L1 is one end melted by the laser beam 100;
And preferably, before recording the first transverse scale X1, the first longitudinal scale Y1/the first longitudinal scale Y1 ', the position of the welding wire L may be adjusted so that the central axis of the welding wire L coincides with/is parallel to the transverse scale line X in the top-view imaging field S, and the welding wire L crosses the longitudinal scale line Y, so as to determine the numerical values of the first transverse scale X1, the first longitudinal scale Y1/the first longitudinal scale Y1';
meanwhile, the synchronously displayed overlook imaging visual field S and the acquired image information of the welding wire L crossed with the transverse scale mark X and the longitudinal scale mark Y of the overlook imaging visual field S can be synchronously zoomed, and the zoom factor is 4-50 times so as to conveniently record scale values;
s4, after the welding cycle is started, the top view imaging field S follows the laser beam 100, and since the intersection point O coincides with the center of the laser beam 100 in step S2, the following process can ensure that the center of the laser beam 100 and the intersection point O always coincide, thereby ensuring that the relative positions of the laser beam 100 and the top view imaging field S are unchanged; and as shown in fig. 3, recording a second transverse scale X2 at the intersection of the welding wire end L1 and the transverse scale line X and a second longitudinal scale Y2 at the intersection of the upper profile D1 and the longitudinal scale line Y/a second longitudinal scale Y2 'at the intersection of the lower profile D1' and the longitudinal scale line Y at a certain moment during the welding cycle;
S5, generating an alarm signal when the first preset condition and/or the second preset condition are met so as to complete the smooth wire centering monitoring of the welding cycle; wherein the first preset condition is | y0| ≦ tan5 ° · | x0 |; the second preset condition is that | | | y1| - | y1'| | is less than or equal to a preset value, or | | | y2| - | y2' | | is less than or equal to a preset value; the y0 is the middle value of the first longitudinal scale y1 and the second longitudinal scale y2, or the middle value of the first longitudinal scale y1 'and the second longitudinal scale y 2'; the x0 is a median value of the first transverse scale x1 and the second transverse scale x2, the preset value may be determined according to the actual machining precision, and is preferably 0.2mm in the embodiment;
s6, if no alarm signal is generated in the monitoring of the light wire centering of the welding cycle and a third condition is met, the wire cutting is not needed in the next welding cycle; wherein the third preset condition is
Or
As shown in fig. 4, X3 is the third transverse scale X3 at the intersection of the welding wire end L1 and the transverse scale line X after the welding of the cycle is completed, and when the third condition is satisfied, it is stated that the position of the welding wire end L1 is not changed greatly, and automatic wire cutting is not needed in the next cycle.
In the embodiment, once the center of the laser spot P coincides with the intersection point O, the relative positions of the laser beam 100 and the overlooking imaging field S can be kept unchanged, and the overlooking imaging field S and the laser beam 100 are also follow-up, so that the degree of centering of the optical fiber in each welding cycle can be monitored by only acquiring images of the overlooking imaging field S and the welding wire L and comparing scale changes at the intersection of the welding wire L and a scale mark in the welding process, and an alarm signal is generated when conditions are met to inform an operator of welding wire position adjustment in advance, so that the timeliness of a production line is ensured, and the requirement on equipment is low; meanwhile, according to the embodiment, whether the neutral of the bare wire is good in three time periods of pre-welding, in-welding and post-welding of a certain welding cycle can be known according to needs, and whether wire cutting is needed or not is determined according to the change of the position of the end of the welding wire after welding is finished, so that the number of times of automatic wire cutting in continuous production is reduced, and continuity of production rhythm is guaranteed.
The second embodiment:
the present invention also provides a bare wire centering monitoring apparatus for laser filler wire welding, which is used to implement the bare wire centering monitoring method according to the first embodiment, as shown in fig. 1 to 4, and includes:
the imaging unit 3 is connected with the laser head 1 and is used for forming a overlooking imaging visual field S and acquiring image information of the welding wire L, the overlooking imaging visual field S is provided with a transverse scale mark X and a longitudinal scale mark Y which are orthogonal, an intersection point is an O point, and the intersection point O is superposed with the center of the laser beam 100; preferably, the imaging unit 3 is connected to the laser head 1 and is coaxially arranged with the emitting part of the laser head to ensure that the intersection point O in the overlooking imaging view S coincides with the center of the laser beam 100;
preferably, the imaging unit 3 includes: the CCD image sensor, the imaging lens and the like, and orthogonal transverse scale mark X and longitudinal scale mark Y can be arranged on the imaging lens and the like;
the display 4 is connected with the imaging unit 3 and is used for synchronously displaying the overlooking imaging field of view S and the image information of the welding wire L crossed with the transverse scale mark X and the longitudinal scale mark Y of the overlooking imaging field of view S so as to obtain (including obtaining through manual visual identification or automatically obtaining according to an image identification technology) the transverse scale mark at the crossed part of the welding wire end L1 and the transverse scale mark X before the beginning of a certain welding cycle and/or during welding and/or after the completion of welding and the longitudinal scale mark at the crossed part of the welding wire and the longitudinal scale mark Y before the beginning of the corresponding welding cycle and/or during welding; wherein, horizontal scale includes: a first transverse scale X1 at the intersection of the wire end L1 and the transverse scale line X before a welding cycle begins, a second transverse scale X2 at the intersection of the wire end L1 and the transverse scale line X at a certain moment during the progress of the welding cycle, and a third transverse scale X3 at the intersection of the wire end L1 and the transverse scale line X after the welding cycle is completed; the longitudinal scale comprises: a first longitudinal scale Y1 ' at the intersection of the upper profile D1 of the welding wire L and the longitudinal scale line Y/a first longitudinal scale Y1 ' at the intersection of the lower profile D1 ' of the welding wire L and the Y-axis before the welding cycle begins, a second longitudinal scale Y2 at the intersection of the upper profile D1 of the welding wire L and the longitudinal scale line Y/a second longitudinal scale Y2 ' at the intersection of the lower profile D1 ' of the welding wire L and the Y-axis at a certain moment in the process of the welding cycle; that is, the horizontal scale and the vertical scale are the same as those in the first embodiment, and are not described herein again;
Preferably, the display 4 is further used for performing gray processing and/or synchronous image scaling (image scaling factor may be 4-50 times) on the acquired overlook imaging field of view S and welding wire L image so as to facilitate the visual and observation of the scale on the display 4;
the control system 5 is used for calculating according to the acquired transverse scale and longitudinal scale, and generating an alarm signal when a calculation result meets a first preset condition and/or a second preset condition, and/or generating a prompt signal that wire cutting is not needed in the next welding cycle when the calculation result meets a third preset condition; the first preset condition, the second preset condition and the third preset condition are the same as those in the first embodiment, and are not described herein again;
and the alarm device 6 is connected with the control system 5 and is used for generating alarm information (such as various sound and light alarm information) according to the alarm signal and/or generating prompt information (such as various sound and light alarm information) according to the prompt signal.
Example three:
the present invention also provides a laser filler wire welding apparatus, as shown in fig. 1 to 4, comprising:
a laser head 1 for emitting a laser beam 100; specifically, the laser head 1 includes: an incident portion and an exit portion, wherein the incident portion includes: an optical coupler 11, a first lens 12, and a first mirror 13; the emission part includes: the lens comprises a shell 21, a second reflector 22 and a second lens 23, wherein the second reflector 22 and the second lens 23 are arranged in the shell 21; the laser beam 100 sequentially passes through the optocoupler 11, the first lens 12 and the first reflector 13, is reflected into the emergent part, and then sequentially passes through the second reflector 22 and the second lens 23 for focusing, and then is emitted;
The wire feeding mechanism 2 is used for conveying a welding wire L, and an included angle alpha formed by the outgoing direction of a laser beam 100 emitted by the laser head 1 and the conveyed welding wire L is 30-60 degrees; therefore, smooth transition of the welding wire can be ensured, and the requirements of different materials and different structure angle adjustment can be met;
and the laser filler wire welding bare wire centering monitoring device in the second embodiment.
In conclusion, the method for monitoring the centering of the optical fiber has low requirements on equipment, can realize the monitoring of the centering degree of the optical fiber in each welding cycle only by acquiring the welding wire and overlooking the image of the imaging visual field and changing the scales at the intersection of the welding wire and the scale marks, and generates an alarm signal when the conditions are met so as to inform an operator of adjusting the position of the welding wire in advance and ensure the timeliness of a production line; meanwhile, according to the embodiment, whether the neutral of the bare wire is good in three time periods of pre-welding, in-welding and post-welding of a certain welding cycle can be known according to needs, and whether wire cutting is needed or not is determined according to the change of the position of the end of the welding wire after welding is finished, so that the number of times of automatic wire cutting in continuous production is reduced, and continuity of production rhythm is guaranteed.
It should be noted that the technical features in the first to third embodiments can be combined arbitrarily, and the combined technical solutions all belong to the scope of protection of the present application. And in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A laser filler wire welding bare wire centering monitoring method is characterized by comprising the following steps:
s1, mounting a laser head and a wire feeding mechanism;
s2, forming a top view imaging visual field, wherein the top view imaging visual field is provided with orthogonal transverse scale marks and longitudinal scale marks, and the intersection is coincided with the center of the laser beam;
s3, displaying image information of a top view imaging view and a welding wire crossed with a transverse scale mark and a longitudinal scale mark of the top view imaging view, and recording a first transverse scale x1 at the crossed position of the end of the welding wire and the transverse scale mark before a certain welding cycle starts, and a first longitudinal scale y1 at the crossed position of the upper contour of the welding wire and the longitudinal scale mark, or recording a first transverse scale x1 at the crossed position of the end of the welding wire and the transverse scale mark before a certain welding cycle starts, and a first longitudinal scale y 1' at the crossed position of the lower contour of the welding wire and the longitudinal scale mark;
S4, after the welding cycle is started, the overlook imaging view field follows the laser beam, and the center of the laser beam is always kept coincident with the intersection point; recording a second transverse scale x2 at the intersection of the end of the welding wire and the transverse scale line and a second longitudinal scale y2 at the intersection of the upper contour of the welding wire and the longitudinal scale line at a certain moment in the process of the welding cycle, or recording a second transverse scale x2 at the intersection of the end of the welding wire and the transverse scale line and a second longitudinal scale y 2' at the intersection of the lower contour of the welding wire and the longitudinal scale line at a certain moment in the process of the welding cycle;
and S5, generating an alarm signal when the scale change at the intersection of the welding wire and the scale mark meets a first preset condition and/or a second preset condition so as to complete the light wire centering monitoring of the welding cycle.
2. The method for monitoring the centering of the optical fiber according to claim 1, wherein the step S3 further comprises: before recording the first transverse scale and the first longitudinal scale, the position of the welding wire is adjusted, so that the central axis of the welding wire is overlapped or parallel to the transverse scale mark in the overlooking imaging visual field.
3. The method for monitoring fiber optic centering according to claim 1, wherein in step S5, the first predetermined condition is | y0| ≦ tan5 ° · | x0|, and y0 is a middle value of the first longitudinal scale y1, the second longitudinal scale y2, or a middle value of the first longitudinal scale y1 ', the second longitudinal scale y 2'; the x0 is the middle value of the first transverse scale x1 and the second transverse scale x 2.
4. The method for monitoring fiber optic alignment of claim 1, wherein in step S5, the second predetermined condition is | | y1| - | y1'| ≦ the predetermined value, or | | | y2| - | y2' | ≦ the predetermined value.
5. The optical fiber centering monitoring method of claim 1, further comprising the steps of:
and S6, if no alarm signal is generated in the light wire centering monitoring of the welding cycle and a third preset condition is met, the wire cutting is not needed in the next welding cycle.
6. The method as claimed in claim 5, wherein the third predetermined condition is that
Or
x3 is the third transverse scale x3 at the intersection of the wire end and the transverse scale line after the cycle of welding is completed.
7. An optical fiber centering monitoring device for implementing the optical fiber centering monitoring method according to any one of claims 1 to 6, comprising:
the imaging unit is connected with the laser head and is used for forming a overlooking imaging visual field and acquiring image information of the welding wire, the overlooking imaging visual field is provided with orthogonal transverse scale marks and longitudinal scale marks, and the intersection point is superposed with the center of the laser beam;
the display is connected with the imaging unit and used for displaying the overlooking imaging visual field and the image information of the welding wire crossed with the transverse scale mark and the longitudinal scale mark of the overlooking imaging visual field so as to obtain the transverse scale mark at the crossed part of the end of the welding wire and the transverse scale mark before starting a certain welding cycle and/or in the process of welding and/or after the welding is finished and the longitudinal scale mark at the crossed part of the welding wire and the longitudinal scale mark before starting the corresponding welding cycle and/or in the process of welding;
And the control system is used for calculating according to the acquired transverse scale and longitudinal scale, and generating an alarm signal when a calculation result meets a first preset condition and/or a second preset condition, and/or generating a prompt signal that wire cutting is not needed in the next welding cycle when the calculation result meets a third preset condition.
8. The optical fiber centering monitoring device of claim 7, further comprising: and the alarm device is connected with the control system and is used for generating alarm information according to the alarm signal and/or generating prompt information according to the prompt signal.
9. A laser filler wire welding device, comprising: a laser head for emitting a laser beam; a wire feeder for feeding a welding wire; and the filament centering monitoring device of any one of claims 7 to 8.
10. The laser filler wire welding device as claimed in claim 9, wherein an angle α formed by an outgoing direction of the laser beam generated by the laser head and the fed welding wire is 30 to 60 °.
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