CN112276366A

CN112276366A - Automatic laser welding equipment and welding method thereof

Info

Publication number: CN112276366A
Application number: CN202011117129.2A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhaoqing Zhongcai Electromechanical Technology Research and Development Co Ltd
Current assignee: Zhaoqing Zhongcai Electromechanical Technology Research and Development Co Ltd
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2021-01-29

Abstract

The invention relates to the technical field of laser welding, and discloses automatic laser welding equipment and a welding method thereof. According to the invention, parallel and uniform light from the parallel light lens I is distributed by welding the beam splitting lens and the film removing welding lens, so that most of the light acts on the focusing lens I for welding, and a small part of the laser acts on the focusing lens II for removing the film, the PVC film is decomposed by high temperature to form a welding channel, the PVC films on two sides of the welding channel shrink towards two sides under the high temperature, so that the welding channel is enlarged, the PVC molten material can be effectively prevented from flowing into a molten pool, the film removing and the welding are simultaneously carried out, the cost of manual film tearing is reduced, and the time and the cost are saved.

Description

Automatic laser welding equipment and welding method thereof

Technical Field

The invention relates to the technical field of laser welding, in particular to automatic laser welding equipment and a welding method thereof.

Background

Current stainless steel can not produce the mar to the stainless steel surface in order to guarantee in the transportation, and the protection film can be covered on the surface to the majority producer, and the stainless steel protection film can be divided into PVC membrane, PE membrane and PET membrane according to the material classification. The laser welding technology is a high-precision welding method using high-energy-density laser beam as heat source, and is characterized by that it mainly utilizes the lots of heat energy contained in the laser beam to heat the surface of workpiece, and the heat energy can be transferred into the interior of workpiece by means of heat conduction so as to melt the workpiece and form a specific molten pool.

When utilizing laser welding technique to come the welding to have the stainless steel of protection film, if direct to tectorial membrane stainless steel welding, laser radiation's high temperature can make the film on stainless steel surface melt, then the film can flow in the molten bath, can make stainless steel workpiece's the welding seam the inside contain partial PVC or PE material like this, it splashes and welding quality is not good to cause the molten drop easily, can produce the undercut under the serious condition, make welded stainless steel produce the crackle easily, the mode of skinning that adopts at present is artifical manual dyestripping more, the manual dyestripping operation degree of difficulty is great, the consumption time is more, the cost of labor is great.

Disclosure of Invention

Aiming at the defects of the existing stainless steel laser welding head in the use process in the background technology, the invention provides the automatic laser welding equipment and the welding method thereof, which have the advantage of automatic film removal and solve the problems in the background technology.

The invention provides the following technical scheme: an automatic laser welding device comprises a laser welding head shell, wherein the laser welding head shell is hollow, a beam expanding lens is fixedly mounted on one side inside the laser welding head shell, a parallel light lens I is arranged on the other side of the beam expanding lens, a welding beam splitting lens is fixedly arranged on one side, far away from the beam expanding lens, of the parallel light lens I, a connecting piece is fixedly connected to the bottom end of the welding beam splitting lens, a film removing beam splitting lens is fixedly mounted at the bottom end of the connecting piece, a reflecting mirror II is fixedly mounted on the side face, far away from the connecting piece, of one end of the film removing beam splitting lens, the reflecting mirror II is fixedly mounted on the side wall inside the laser welding head shell, a reflecting mirror III is arranged at one end, far away from the connecting piece, of the welding beam splitting lens, and the other side of the reflecting, one side that welding beam splitting lens kept away from parallel light lens I is provided with parallel light lens II, one side that welding beam splitting lens was kept away from to parallel light lens II is provided with focusing lens I, one side that removing membrane beam splitting lens kept away from parallel light lens I is provided with parallel light lens III, one side that removing membrane beam splitting lens was kept away from to parallel light lens III is provided with focusing lens II, one side that focusing lens II was kept away from focusing lens II is provided with the protection lens piece, the one end that beam expanding lens was kept away from at the laser welder head shell to protection lens piece fixed mounting, the corrosion resistant plate has been placed to the one end that the laser welder head shell is close to the protection lens piece, the surface of corrosion resistant plate covers.

Preferably, one side of the connecting piece close to the parallel light lens I is fixedly connected with a reflector I, the reflector I comprises an upper right-angle reflector and a lower right-angle reflector, the upper right-angle reflector and the lower right-angle reflector can be spliced into an isosceles triangle, the inclined sides of the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly provided with a reflector surface, and the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly arranged with the welding beam splitting lens and the film removing beam splitting lens.

Preferably, the welding beam splitting lens and the film removing beam splitting lens are concave lenses, the circular arc centers of the left side and the right side of the welding beam splitting lens and the film removing beam splitting lens are the same, the circular arc radiuses of the left side and the right side of the welding beam splitting lens and the film removing beam splitting lens are equal, and the welding beam splitting lens and the film removing beam splitting lens are formed by being divided from the same concave lens.

Preferably, the uppermost laser beam of the parallel light lens i is a laser beam a, the lowermost laser beam of the welding beam splitting lens is a laser beam b, the light distribution length between the laser beams a and b is L, the uppermost laser beam of the film removing beam splitting lens is a laser beam c, the lowermost laser beam of the parallel light lens i is a laser beam d, the light distribution length between the laser beam c and the laser beam d is M, and if the temperature required for welding stainless steel is T1 and the temperature required for decomposing a PVC film is T2, L: M: T1: T2.

Preferably, the connecting piece includes the public tenon, public tenon and one side fixed mounting of welding beam splitting lens, and the public tenon is right trapezoid, it has the screw to run through fixedly on the public tenon, the screw is three totally, the hypotenuse wedging of public tenon has female tenon, female tenon is right trapezoid, the screw runs through female tenon, with fixed connection between public tenon and the female tenon, and the opposite side of female tenon with remove membrane beam splitting lens fixed connection, set up threaded hole on public tenon and the female tenon and be used for the mounting screw.

Preferably, speculum II includes first reflecting plate, one side fixed mounting of first reflecting plate is in the one side of removing membrane beam splitting lens, one side fixed mounting that first reflecting plate kept away from except that membrane beam splitting lens has the second reflecting plate, one side fixed mounting of first reflecting plate has the third reflecting plate, the third reflecting plate is located the right side of second reflecting plate, and the side of second reflecting plate and third reflecting plate closely laminates, the below of first reflecting plate is provided with the fourth reflecting plate, the inside lateral wall of one side fixed mounting laser welding head shell that first reflecting plate was kept away from to the fourth reflecting plate.

Preferably, the height of the third reflector is twice the height of the second reflector, the surfaces of the first reflector, the second reflector, the third reflector opposite to the fourth reflector are reflective surfaces, and the length of the fourth reflector is greater than that of the first reflector.

A welding method of an automatic laser welding device comprises the following steps:

s1, placing the stainless steel plate with the film on a workbench of laser equipment, and aligning the area to be welded with a straight line where a focusing point B of a focusing lens I and a focusing point C of a focusing lens II are located;

s2, turning on a power supply of the laser equipment;

s3, removing the PVC protective film by the M-area laser beam projected by the focusing lens II;

and S4, welding the stainless steel plate after the film is removed by the laser beam in the L area projected by the focusing lens I.

The invention has the following beneficial effects:

1. according to the invention, parallel and uniform light from the parallel light lens I is distributed by welding the beam splitting lens and the film removing welding lens, so that most of the light acts on the focusing lens I for welding, and a small part of the laser acts on the focusing lens II for removing the film, the PVC film is decomposed by high temperature to form a welding channel, the PVC films on two sides of the welding channel shrink towards two sides under the high temperature, so that the welding channel is enlarged, the PVC molten material can be effectively prevented from flowing into a molten pool, the film removing and the welding are simultaneously carried out, the cost of manual film tearing is reduced, and the time and the cost are saved.

2. According to the invention, the light refracted by the film-removing beam splitting lens can be focused and then the PVC film can be decomposed into carbon dioxide and carbon monoxide, the decomposed gas can be used as a protective gas, the concentration of the protective gas is increased, a protective effect is achieved on the protective lens, and meanwhile, the stainless steel melting material can be prevented from being oxidized.

3. The invention plays a role of compensating light energy through the connecting piece and the reflecting mirror, recycles the residual light distributed by the welding beam splitting lens and the film removing beam splitting lens, evenly distributes the light to the parallel light lens II and the parallel light lens III through the reflecting mirror I, the reflecting mirror II and the reflecting mirror III, loses energy in the transmission process of the output light of the welding beam splitting lens and the film removing beam splitting lens, redistributes the residual light by the reflecting mirror to supplement the light energy, simultaneously the reflecting mirror also plays a role of protecting the connecting piece, avoids the radiation heat energy in the residual laser from melting the connecting piece to influence the connecting effect of the connecting piece, and simultaneously improves the service life of the connecting piece.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal refraction of the present invention;

FIG. 3 is a schematic view of the internal reflection of light rays according to the present invention;

FIG. 4 is a schematic view of a connector structure according to the present invention;

FIG. 5 is a schematic view of the structure at A in FIG. 3 according to the present invention.

In the figure: 1. a laser welding head housing; 2. a beam expanding lens; 3. a parallel light lens I; 4. welding a beam splitting lens; 5. a connecting member; 51. a tenon; 52. a screw; 53. a female tenon; 6. a reflector I; 7. a film-removing beam-splitting lens; 8. a reflector II; 81. a first reflection plate; 82. a second reflection plate; 83. a third reflection plate; 84. a fourth reflection plate; 9. a reflector III; 10. a parallel light lens II; 11. a focusing lens I; 12. a parallel light lens III; 13. a focusing lens II; 14. protecting the lens; 15. a stainless steel plate; 16. PVC protective film.

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.

Referring to fig. 1-5, the present invention is only a structure diagram of a laser welding head in a laser welding device, and referring to fig. 1, the present invention includes a laser welding head housing 1, the interior of the laser welding head housing 1 is hollow, and a beam expanding lens 2 is fixedly installed on one side of the interior of the laser welding head housing 1, one side of the beam expanding lens 2 is a laser source, laser transmitted from the laser source is expanded by the beam expanding lens 2, the other side of the beam expanding lens 2 is provided with a parallel light lens i 3, the parallel light lens i 3 can integrate laser beams from the beam expanding lens 2 into parallel output laser beams, so that the laser beams output from the parallel light lens i 3 are uniformly distributed, so that the laser beams for welding and laser beams for film removal can be uniformly distributed, one side of the parallel light lens i 3 away from the beam expanding lens 2 is fixedly provided with a welding beam, the bottom end of the welding beam splitting lens 4 is fixedly connected with a connecting piece 5, the bottom end of the connecting piece 5 is fixedly provided with a film removing beam splitting lens 7, the side surface of one end, far away from the connecting piece 5, of the film removing beam splitting lens 7 is fixedly provided with a reflecting mirror II 8, one side, far away from the film removing beam splitting lens 7, of the reflecting mirror II 8 is fixedly arranged on the inner side wall of the laser welding head shell 1, one end, far away from the connecting piece 5, of the welding beam splitting lens 4 is provided with a reflecting mirror III 9, one side, close to the welding beam splitting lens 4, of the reflecting mirror III 9 is a reflecting mirror surface, the other side of the reflecting mirror III 9 is fixedly arranged on the inner side wall of the laser welding head shell 1, one side, far away from the parallel light lens I3, of the welding beam splitting lens 4 is provided with a parallel light lens II 10, one side, far away from the, one side that the membrane beam splitting lens 7 was kept away from to parallel light lens III 12 is provided with focusing lens II 13, one side that focusing lens II 13 was kept away from focusing lens II 13 is provided with protective glass 14, protective glass 14 fixed mounting is in the one end that beam expanding lens 2 was kept away from to laser welding head shell 1, stainless steel plate 15 has been placed to the one end that laser welding head shell 1 is close to protective glass 14, stainless steel plate 15 is placed on laser welding equipment's workstation, stainless steel plate 15's surface covers there is PVC protection film 16.

Wherein, one side of the connecting piece 5 close to the parallel light lens I3 is fixedly connected with a reflector I6, the reflector I6 comprises an upper right-angle reflector and a lower right-angle reflector which can be spliced into an isosceles triangle, the inclined sides of the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly provided with a reflector surface, the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly provided with a welding beam splitting lens 4 and a film removing beam splitting lens 7, referring to figure 3, the dotted line in figure 3 is a normal line, the solid line with an arrow represents light, the parallel light at the parallel light lens I3 passes through the reflector I6 and then is reflected, the reflector surface close to the welding beam splitting lens 4 reflects the laser light into the welding beam splitting lens 4 and then is refracted onto the reflector III 9 through the welding beam splitting lens 4, the reflector III 9 reflects the light beam onto the welding beam splitting lens 4, the refraction is carried out again, after the laser beam is refracted again by the welding beam splitting lens 4, the laser beam is refracted to a parallel light lens II 10, the uppermost laser beam of the upper right-angle reflector is e in the figure, the lowermost laser beam of the upper right-angle reflector is f, the laser beam e and the laser beam f are boundary beams of all reflected light beams of the upper right-angle reflector, after the light beam reflected by the parallel light lens I3 through the upper right-angle reflector, the light distribution range of the light beam refracted by the welding beam splitting lens 4 and the reflector III 9 on the parallel light lens II 10 is between the laser beam e and the laser beam f, after the laser beam reflected by the lower right-angle reflector enters a film removing beam splitting lens 7, the refraction is carried out, after the reflected light beam is reflected by a reflector II 8, the light beam is emitted to a parallel light lens III 12, the uppermost laser beam of the lower right-angle reflector is, the lowest laser beam is h, the laser beam g and the laser beam h are boundary beams of all reflected beams of the lower right-angle reflector, and the distribution range of the reflected and refracted laser beams on the parallel light lens III 12 is also between the laser beam g and the laser beam h.

Wherein, the welding beam splitting lens 4 and the film removing beam splitting lens 7 are concave lenses, the circle centers of the arcs of the left and right sides of the welding beam splitting lens 4 and the film removing beam splitting lens 7 are the same, the radii of the arcs of the left and right sides of the welding beam splitting lens 4 and the film removing beam splitting lens 7 are the same, the welding beam splitting lens 4 and the film removing beam splitting lens 7 are divided from the same concave lens, referring to figure 2, the origin of the welding beam splitting lens 4 and the origin of the film removing beam splitting lens 7 are at the same point O, the focus of the welding beam splitting lens 4 and the focus of the film removing beam splitting lens 7 are also at the same point F, the dotted line in the figure is the extension line of the refracted laser beam and the focus, the realization with an arrow represents the light of the laser beam, the laser beam which is uniformly parallel from the parallel light lens I3 is refracted to the parallel light lens II 10 and the parallel light lens III 12 by the welding beam splitting lens 4 and the film removing, the laser beam at the parallel light lens II 10 is focused by the focusing lens I11 and then used for welding the stainless steel plate, a small part of the laser beam is refracted onto the parallel light lens III 12 by the film removing beam splitting lens 7, and the laser beam at the parallel light lens III 12 is focused by the focusing lens II 13 and then used for removing the film.

Referring to fig. 2, the uppermost laser beam of the parallel light lens i 3 is a laser beam a, the lowermost laser beam of the welding beam splitting lens 4 is a laser beam b, the light distribution length between the laser beam a and the laser beam b is L, the uppermost laser beam of the film removing beam splitting lens 7 is a laser beam C, the lowermost laser beam of the parallel light lens i 3 is a laser beam d, the light distribution length between the laser beam C and the laser beam d is M, assuming that the temperature required for welding stainless steel is T1 and the temperature required for decomposing a PVC film is T2, L: T1: T2, the laser beam of the L region is used for welding stainless steel, the laser beam of the M region is used for decomposing a PVC film, the laser beam of the M region is focused on a point C through a focusing lens ii 13, the focusing point C is attached to a PVC protective film 16, the laser beam of the M region heats the PVC film to decompose the PVC film into gases such as carbon dioxide and carbon monoxide, the carbon dioxide and the carbon monoxide that produce are used as protective gas, the welding at the back of the protection, avoid the inside stainless steel melt oxidation of molten bath, form a passageway, the PVC membrane of the both sides of this passageway receives the waste heat influence of M district laser beam, curl to the outside on passageway both sides, the scope of increase passageway, the laser beam in L district focuses on a little B through focusing lens I11, focusing point B laminates on stainless steel plate 15, the laser in L district welds the stainless steel after removing the membrane, the degree of difficulty of removing the membrane has been reduced, the cost of artifical manual dyestripping has been reduced simultaneously.

Referring to fig. 4, the connecting member 5 includes a male tenon 51, the male tenon 51 is fixedly mounted on one side of the welding beam splitting lens 4, the male tenon 51 is in a right trapezoid shape, three screws 52 are fixedly arranged on the male tenon 51 in a penetrating manner, the inclined sides of the male tenon 51 are wedged with a female tenon 53, the female tenon 53 is in a right trapezoid shape, the screws 52 penetrate through the female tenon 53, the male tenon 51 is fixedly connected with the female tenon 53, the other side of the female tenon 53 is fixedly connected with the film removing beam splitting lens 7, and threaded holes are formed in the male tenon 51 and the female tenon 53 for mounting the screws 52.

Referring to fig. 5, the second reflector ii 8 includes a first reflector 81, one side of the first reflector 81 is fixedly installed on one side of the film-removing beam-splitting lens 7, one side of the first reflector 81 far away from the film-removing beam-splitting lens 7 is fixedly installed with a second reflector 82, one side of the first reflector 81 is fixedly installed with a third reflector 83, the third reflector 83 is located on the right side of the second reflector 82, the second reflector 82 is closely attached to the side of the third reflector 83, a fourth reflector 84 is disposed below the first reflector 81, one side of the fourth reflector 84 far away from the first reflector 81 is fixedly installed with the inner side wall of the laser welding head housing 1, the height of the third reflector 83 is twice the height of the second reflector 82, the surfaces of the first reflector 81, the second reflector 82, the third reflector 83 opposite to the fourth reflector 84 are reflective surfaces, and the length of the fourth reflector 84 is greater than the length of the first reflector 81, in fig. 5, the broken line is a normal line, the solid line with an arrow is a laser beam, after the laser beam g and the laser beam h refracted by the film removing beam splitting lens 7 contact the fourth reflection plate 84, they are reflected and reflected onto the first reflection plate 81, a first light distribution area is formed between the laser beam g and the laser beam h on the first reflection plate 81, the length of the first light distribution area is less than the length of the reflection surface on the first reflection plate 81, the laser beam g and the laser beam h contact the fourth reflection plate 84 again and are reflected onto the second reflection plate 82, a second light distribution area is formed between the laser beam g and the laser beam h on the second reflection plate 82, the length of the second light distribution area is less than the length of the reflection surface on the second reflection plate 82, after the laser beam g and the laser beam h contact the fourth reflection plate 84 for the third time, they contact the third reflection plate 83, then a third light distribution area is formed, the laser beam h directly reflects onto the parallel light lens 12 through the fourth reflection plate 84 after contacting the third reflection plate 83 once, however, the laser beam g will return to the third reflector 83 again after being reflected by the fourth reflector 84, and then form a fourth light distribution area with the laser beam h reflected by the third reflector 83, and the sum of the length of the third light distribution area and the length of the fourth light distribution area is less than the length of the reflecting surface of the third reflector 83.

s1, placing the stainless steel plate 15 with the film on a workbench of laser equipment, and aligning the area to be welded with a straight line where a focusing point B of a focusing lens I11 and a focusing point C of a focusing lens II 13 are located;

s2, turning on a power supply of the laser equipment;

s3, removing the PVC protective film 16 by the M-area laser beam projected by the focusing lens II 13;

s4, welding the stainless steel plate 15 after film removal by the laser beam in the L area projected by the focusing lens I11.

The using method of the invention is as follows:

the stainless steel plate with the film is placed on a workbench of laser equipment, an area needing to be welded is aligned to a straight line where a focus point B and a focus point C are located, then a power supply of the laser equipment is turned on, the laser source transmits laser to a beam expanding lens 2, the beam expanding lens 2 expands the laser source, then a parallel light lens I3 is utilized to integrate light rays into parallel and uniform light beams, the parallel light beams from the parallel light lens I3 are distributed through a welding beam splitting lens 4 and a film removing beam splitting lens 7, then the light rays are refracted to a parallel light lens II 10 and a parallel light lens III 12 through the welding beam splitting lens 4 and the film removing beam splitting lens 7, most of the light rays are refracted to the parallel light lens II 10 by the welding beam splitting lens 4, the laser beam at the position of the parallel light lens II 10 is focused by a focusing lens I11 and then used for welding the stainless steel plate, and a small part of the laser beam is refracted to the parallel light lens III, the laser beam at the position of the parallel light lens III 12 is focused by the focusing lens II 13 and then used for removing the film, the PVC film is decomposed at high temperature, a welding channel is formed along the region to be welded, the PVC films on the two sides of the channel shrink under the influence of high temperature, the width of the welding channel is increased, and then the laser beam at the position of the parallel light lens II 10 is used for welding the stainless steel plate.

Regarding the light reflection process on the connecting piece and the connecting mode:

light reflection: parallel light at the parallel light lens I3 passes through a reflector I6 and then is reflected, a reflecting mirror surface close to a welding beam splitting lens 4 reflects laser into the welding beam splitting lens 4, then the laser is refracted onto a reflector III 9 through the welding beam splitting lens 4, the reflector III 9 reflects the light beam onto the welding beam splitting lens 4 and is refracted again, after the laser is refracted again through the welding beam splitting lens 4, the laser beam is refracted onto a parallel light lens II 10, the uppermost laser beam of an upper right-angle reflector is e, the lowermost laser beam of the upper right-angle reflector is f, the laser beam e and the laser beam f are boundary beams of all reflected light beams of the upper right-angle reflector, the light distribution range of the light beam on the parallel light lens II 10 after the parallel light lens I3 is reflected through the upper right-angle reflector, the light beam is refracted by the welding beam splitting lens 4, and the reflector III 9 is between the laser beam e and the laser beam f, and after the laser beam reflected by the lower right-angle reflector enters the film removing beam splitting lens 7, the laser beam is refracted, the refracted light beam is reflected by the reflector II 8 and then is emitted to the parallel light lens III 12, the uppermost laser beam of the lower right-angle reflector is g, the lowermost laser beam is h, the laser beam g and the laser beam h are boundary beams of all reflected light beams of the lower right-angle reflector, and the distribution range of the reflected and refracted laser beam on the parallel light lens III 12 is between the laser beam g and the laser beam h.

The connection mode is as follows: the welding beam splitting lens 4 and the film removing beam splitting lens 7 are placed in the direction that the male tenon 51 and the female tenon 53 are wedged, the screw 52 is aligned with the threaded hole between the female tenons 53, and then the screw 52 is rotated into the threaded hole, so that the welding beam splitting lens 4 and the film removing beam splitting lens 7 are fixed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "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.

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

1. An automatic change laser welding equipment, includes laser welding head shell (1), its characterized in that: the inner part of the laser welding head shell (1) is hollow, one side of the inner part of the laser welding head shell (1) is fixedly provided with a beam expanding lens (2), the other side of the beam expanding lens (2) is provided with a parallel light lens I (3), one side, far away from the beam expanding lens (2), of the parallel light lens I (3) is fixedly provided with a welding beam splitting lens (4), the bottom end of the welding beam splitting lens (4) is fixedly connected with a connecting piece (5), the bottom end of the connecting piece (5) is fixedly provided with a film removing beam splitting lens (7), one side, far away from the connecting piece (5), of the film removing beam splitting lens (7) is fixedly provided with a reflecting mirror II (8), one side, far away from the film removing beam splitting lens (7), of the reflecting mirror II (8) is fixedly arranged on the inner side wall of the laser welding head shell (1), one end, far away from the connecting piece (, and the other side of the reflector III (9) is fixedly arranged on the inner side wall of the laser welding head shell (1), one side of the welding beam splitting lens (4) far away from the parallel light lens I (3) is provided with a parallel light lens II (10), one side of the parallel light lens II (10) far away from the welding beam splitting lens (4) is provided with a focusing lens I (11), one side of the film removing beam splitting lens (7) far away from the parallel light lens I (3) is provided with a parallel light lens III (12), one side of the parallel light lens III (12) far away from the film removing beam splitting lens (7) is provided with a focusing lens II (13), one side of the focusing lens II (13) far away from the focusing lens II (13) is provided with a protective lens (14), the protective lens (14) is fixedly arranged at one end of the laser welding head shell (1) far away from the beam expanding lens (2), one end of the laser welding head shell (1) close to the protective lens (14, the surface of the stainless steel plate (15) is covered with a PVC protective film (16).

2. An automated laser welding apparatus according to claim 1, characterized in that: one side of the connecting piece (5) close to the parallel light lens I (3) is fixedly connected with a reflector I (6), the reflector I (6) comprises an upper right-angle reflector and a lower right-angle reflector which can be spliced into an isosceles triangle, the inclined sides of the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly provided with a reflector surface, and the upper right-angle reflector and the lower right-angle reflector are respectively and fixedly arranged with a welding beam splitting lens (4) and a film removing beam splitting lens (7).

3. An automated laser welding apparatus according to claim 1, characterized in that: welding beam splitting lens (4) are concave lens with except that membrane beam splitting lens (7), welding beam splitting lens (4) are the same with the circular arc centre of a circle of the left and right sides that removes membrane beam splitting lens (7), and welding beam splitting lens (4) and the circular arc radius that removes membrane beam splitting lens (7) the left and right sides equal, welding beam splitting lens (4) and remove membrane beam splitting lens (7) and form from the same concave lens segmentation.

4. An automated laser welding apparatus according to claim 1, characterized in that: the uppermost laser beam of the parallel light lens I (3) is a laser beam a, the lowermost laser beam of the welding beam splitting lens (4) is a laser beam b, the light distribution length between the laser beam a and the laser beam b is L, the uppermost laser beam of the film removing beam splitting lens (7) is a laser beam c, the lowermost laser beam of the parallel light lens I (3) is a laser beam d, the light distribution length between the laser beam c and the laser beam d is M, and if the temperature required during stainless steel welding is T1 and the temperature required during PVC film decomposition is T2, L: M is T1: T2.

5. An automated laser welding apparatus according to claim 1, characterized in that: connecting piece (5) are including public tenon (51), one side fixed mounting of public tenon (51) and welding beam splitting lens (4), and public tenon (51) are right trapezoid, it has screw (52) to go up fixed running through in public tenon (51), screw (52) are total three, the hypotenuse wedging of public tenon (51) has female tenon (53), female tenon (53) are right trapezoid, screw (52) run through female tenon (53), with fixed connection between public tenon (51) and female tenon (53), and the opposite side of female tenon (53) with remove membrane beam splitting lens (7) fixed connection, set up threaded hole on public tenon (51) and female tenon (53) and be used for installing screw (52).

6. An automated laser welding apparatus according to claim 1, characterized in that: the second reflector (8) comprises a first reflector (81), one side of the first reflector (81) is fixedly mounted on one side of the film-removing beam splitting lens (7), one side of the first reflector (81) far away from the film-removing beam splitting lens (7) is fixedly mounted with a second reflector (82), one side of the first reflector (81) is fixedly mounted with a third reflector (83), the third reflector (83) is located on the right side of the second reflector (82), the second reflector (82) is tightly attached to the side edge of the third reflector (83), a fourth reflector (84) is arranged below the first reflector (81), and the fourth reflector (84) is far away from the inner side wall of the laser welding head shell (1) fixedly mounted on one side of the first reflector (81).

7. An automated laser welding apparatus according to claim 6, wherein: the height of the third reflecting plate (83) is twice that of the second reflecting plate (82), the surfaces of the first reflecting plate (81), the second reflecting plate (82), the third reflecting plate (83) opposite to the fourth reflecting plate (84) are reflecting surfaces, and the length of the fourth reflecting plate (84) is greater than that of the first reflecting plate (81).

8. The welding method of an automated laser welding apparatus according to claim 1, comprising the steps of:

s1, placing the stainless steel plate (15) with the film on a workbench of laser equipment, and aligning the area to be welded with a straight line where a focusing point B of a focusing lens I (11) and a focusing point C of a focusing lens II (13) are located;

s2, turning on a power supply of the laser equipment;

s3, removing the PVC protective film (16) by the M-area laser beam projected by the focusing lens II (13);

s4, welding the stainless steel plate (15) after film removal by the laser beam in the L area projected by the focusing lens I (11).