CN220296164U - Handheld welding gun - Google Patents

Abstract

The application belongs to the technical field of handheld welding guns, and particularly relates to a handheld welding gun. The first light source output assembly of the handheld welding gun generates a first laser beam, the second light source output assembly generates a second laser beam, and the second laser beam is transmitted along a first direction after passing through the reflecting vibrating mirror. On the one hand, the focuses of the first laser beam and the second laser beam on the surface of the workpiece to be welded are distributed at preset intervals along the welding seam, the surface of the workpiece to be welded is preheated for preset time by the first laser beam, so that the temperature of the surface of the workpiece to be welded is increased, the surface of the workpiece to be welded is roughened, the reflectivity of the workpiece to be welded to the second laser beam is reduced, the absorptivity is increased, and the effective utilization rate of output energy, the laser welding efficiency and the welding quality are improved. On the other hand, the technical scheme of the welding gun is more compact in layout, saves the occupied space of the structure, can improve the practicability of the handheld welding gun, eliminates the limitation on the materials of the workpieces to be welded, and improves the welding universality.

Description

Handheld welding gun

Technical Field

The application belongs to the technical field of handheld welding guns, and particularly relates to a handheld welding gun.

Background

At present, laser welding has the advantages of non-contact, high efficiency, small thermal deformation and the like, and has been widely applied to industries such as automobiles, molds, electronics and the like. Laser welding is a welding process in which the material to be processed melts after absorbing laser energy. The reflectivity of the material to laser directly affects the welding quality and the welding efficiency, and the reflectivity of the high-reflectivity material (such as copper, aluminum, gold and silver) to the laser is extremely high, so that most of energy is reflected to be wasted and even a molten pool cannot be formed. In general, in order to ensure a welding effect, the power of a light source of a welding gun is large, and the more the power of the light source of the welding gun is large, the more laser light is reflected and wasted.

In order to solve the problem of poor laser absorption of the high-reflection material in the prior art, the high-reflection material is usually pretreated before being welded, however, the material treatment steps of the methods are complicated, and automatic production cannot be realized.

Disclosure of Invention

In order to achieve the above purpose, the present application proposes a handheld welding gun, which aims to solve the problem of energy waste when the handheld welding gun welds a high-reflection material chamber in the prior art.

The technical scheme that this application adopted is: the utility model provides a handheld welding gun, includes welding body and the handle body that is connected, and the extending direction and the welding body of handle body intersect, and the welding body has along the transition chamber and the installation cavity of first direction intercommunication each other in proper order, and the inner chamber of handle body communicates in transition chamber and installation cavity and is linked together position department, its characterized in that, handheld welding gun still includes:

the focusing mirror and the reflecting vibrating mirror are sequentially and detachably arranged in the mounting cavity along the first direction;

the first light source output assembly is arranged in the transition cavity and positioned at one side of the reflecting vibrating mirror, and is used for generating a first laser beam, and the first laser beam is transmitted along a first direction;

the second light source output assembly is arranged in the handle body and positioned at the other side of the opposite arrangement of the reflecting vibrating mirror, the second light source output assembly is used for generating a second laser beam, the second laser beam is transmitted along the first direction after passing through the reflecting vibrating mirror, and the first laser beam and the second laser beam are distributed at a preset interval along a welding line at the focus of the surface of a workpiece to be welded.

In one embodiment, the reflective mirror is coated and configured to be transparent to the first laser beam and to reflect the second laser beam.

In one embodiment, the handheld welding gun further comprises a galvanometer motor disposed within the transition chamber and positioned below the first light source output assembly.

In one embodiment, the reflective galvanometer is angled between 40 and 70 degrees from the first direction; the central axis of the handle body and the central axis of the welding body form an included angle of 40-70 degrees.

In one embodiment, the first light source output assembly comprises a first collimation module, the first collimation module comprises a quartz rod, a first collimation lens, a second collimation lens, a first lens barrel adjusting seat and a plurality of fasteners, the quartz rod, the first collimation lens and the second collimation lens are sequentially connected to the first lens barrel, a plurality of evenly distributed mounting holes are formed in the circumference of the adjusting seat, one end of each fastener is connected to the adjusting seat through each mounting hole, the other end of each fastener is abutted to the first lens barrel, and the angle of each first lens barrel can be adjusted through each fastener so as to adjust the distance between focuses of the first laser beam and the second laser beam on the surface of a workpiece to be welded. .

In one embodiment, the handheld welding gun further comprises a connecting seat, and the first lens barrel is pressed into the transition cavity through the connecting seat.

In one embodiment, the handheld welding gun further comprises a protective mirror arranged in the mounting cavity, and the reflecting vibrating mirror, the focusing mirror and the protective mirror are sequentially connected in an optical path.

In one embodiment, the first laser beam and the second laser beam have a focal distance of 0.5-1.5mm at the surface of the workpiece to be welded.

In one embodiment, the first light source output assembly comprises a first laser having a wavelength of 915mm or 975mm;

the second light source output assembly includes a second laser having a wavelength of 1080mm or 1064mm.

In one embodiment, the focusing lens is configured as a detachable box structure, and the angle of the focusing lens can be adjusted by the locking force of the corresponding locking screw.

The application has at least the following beneficial effects:

according to the laser welding method, the first laser beam with the short wavelength is arranged in the welding gun, the characteristic that the high-reflectivity material is poor in absorptivity of the laser beam with the short wavelength is utilized, the surface of the workpiece to be welded is subjected to preheating treatment for a preset time, the surface temperature of the workpiece to be welded is increased, the surface is roughened, the reflectivity of the workpiece to be welded to the second laser beam is reduced, the absorptivity is increased, the wavelengths output by the laser are effectively utilized, the effective utilization rate of output energy is improved, and the laser welding efficiency and the welding quality are further improved. On the other hand, the technical scheme of this application is compacter in the overall arrangement, saves structure occupation space, can promote handheld type convenient welding set's practicality and welding commonality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a hand-held welding gun of the present application;

fig. 2 is an exploded view of the adjustment base and the first barrel;

FIG. 3 is a perspective view of a connecting base;

FIG. 4 is a perspective view of a focusing mirror;

FIG. 5 is a perspective view of a focusing optic;

fig. 6 is a schematic view of the optical path of the present application.

Wherein, each reference sign in the figure:

2. a reflective vibrating mirror; 1. a first light source output assembly; 10. a first laser beam; 34. a quartz rod; 12. a first barrel; 14. an adjusting seat; 140. a mounting hole; 15. a fastener; 3. a second light source output assembly; 31. a second quartz rod; 32. a second barrel; 33. a first collimating mirror; 11. a second collimating mirror; 30. a second laser beam; 4. a focusing mirror; 40. a focusing lens; 41. locking a screw; 42. a mounting shell; 44. a rotating shaft; 43. a connecting column; 421. a guide hole; 5. a protective mirror; 6. welding the body; 60. a rear cover; 61. a mounting cavity; 62. a transition chamber; 63. a connecting seat; 64. a galvanometer motor; 7. a handle body; 80. and (5) welding the workpiece.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The handheld welding gun is mainly used for welding metal materials with high reflectivity.

Based on the background, it can be known that: the reflectivity of the material to laser directly affects the welding quality and the welding efficiency, and the reflectivity of the high-reflectivity material (such as copper, aluminum, gold and silver) to the laser is extremely high, so that most of energy is reflected to be wasted and even a molten pool cannot be formed. Further, the laser for welding generally includes a laser light source that outputs a laser beam with a single wavelength to perform welding, but different workpieces to be welded have different laser absorption capacities for different wavelengths, so that when the laser with a single wavelength is used for welding, there may be problems of high reflection and low absorption of the laser with the workpiece 80 to be welded for the wavelength, so that the output energy of the laser cannot be effectively utilized, and the laser welding efficiency is low and the quality is poor.

In addition, the research shows that the high-reflection material has better absorptivity for the wave band of 1080nm or 1064nm, but has poorer absorptivity for the wave band of 975nm or 915 nm.

The following describes the technical scheme of the present application in detail through specific embodiments. It should be noted that the following embodiments may exist alone or in combination with each other, and for the same or similar content, the description will not be repeated in different embodiments.

The embodiment of the application provides a handheld welding gun. The hand-held welding gun is suitable for welding a workpiece 80 to be welded which is of a local high-reflectivity nature.

Fig. 1 is a cross-sectional view of a hand-held welding gun of the present application, as shown in fig. 1, which relates to a hand-held welding device comprising a welding body 6 and a handle body 7 connected. Wherein, the extending direction of the handle body 7 intersects with the welding body 6, the welding body 6 is provided with a transition cavity 62 and a mounting cavity 61 which are communicated with each other in sequence along the first direction, and the inner cavity of the handle body 7 is communicated with the position where the transition cavity 62 and the mounting cavity 61 are communicated. The handheld welding gun also comprises a focusing mirror 4, a reflecting vibrating mirror 2, a first light source output assembly 1 and a second light source output assembly 3.

Fig. 6 is a schematic view of the optical path of the present application, and as shown in fig. 6, in particular, the reflecting galvanometer 2 and the focusing mirror 4 are detachably disposed in the mounting cavity 61 in sequence along the first direction. The first light source output assembly 1 is disposed in the transition cavity 62 and is located at one side of the reflective galvanometer 2. The first light source output assembly 1 is used for generating a first laser beam 10, the first light source output assembly 1, the reflecting galvanometer 2 and the focusing mirror 4 are sequentially connected in an optical path, and the first laser beam 10 is transmitted along a first direction. The second light source output assembly 3 is disposed in the handle body 7 and located at the other side of the opposite arrangement of the reflecting galvanometer 2, and the second light source output assembly 3 is used for generating a second laser beam 30. The second light source output assembly 3, the reflecting galvanometer 2 and the focusing mirror 4 are sequentially connected in an optical path.

Preferably, the first laser beam 10 is configured as a short wavelength band beam, such as a fiber laser having a wavelength of 1064nm or 1080; the second laser beam 30 is configured as a long wavelength band beam, such as a semiconductor laser having a wavelength of 975mn or 915 mm.

Also, the workpiece 80 to be welded according to the present application has a low reflection and/or a high absorption effect on at least one wavelength of the first laser beam 10 and the second laser beam 30.

By applying the optical path layout of the present application, the second laser beam 30 is transmitted along the first direction after passing through the reflecting galvanometer 2, and the focal points of the first laser beam 10 and the second laser beam 30 on the surface of the workpiece 80 to be welded are distributed at a predetermined interval along the extending direction of the welding seam. Specifically, the first laser beam 10 with a short wavelength is arranged in the welding gun, the characteristic that the high-reflectivity material has poor absorptivity to the laser beam with the short wavelength is utilized, the surface of the workpiece 80 to be welded is subjected to preheating treatment for a predetermined time, the surface temperature of the workpiece 80 to be welded is increased, the surface is roughened, the reflectivity of the workpiece 80 to be welded to the second laser beam 30 is reduced, the absorptivity is increased, each wavelength output by the laser is effectively utilized, the effective utilization rate of output energy is improved, and the laser welding efficiency and the welding quality are further improved.

On the other hand, the technical scheme of this application is compacter in the overall arrangement, saves structure occupation space, can promote handheld type convenient welding set's practicality and welding commonality.

In one embodiment, the mirror 2 is coated and configured to be transparent to the first laser beam 10 and to reflect the second laser beam 30.

Preferably, both sides of the lens of the focusing lens 4 are plated with a 1064nm fiber laser full-transparent film or 1080nm fiber laser full-transparent film, and 975nm or 915 semiconductor laser full-transparent film.

In one embodiment, referring to fig. 1, the handheld welding gun further includes a galvanometer motor 64, and the galvanometer motor 64 is disposed in the transition cavity 62 and is located at the lower side of the first light source output assembly 1. Specifically, the galvanometer motor 64 is disposed at a predetermined angle, and the galvanometer motor 64 is connected to an end of the reflecting galvanometer 2. In this way, the galvanometer motor 64 and the reflecting galvanometer 2 are arranged at the lower side of the first light source output assembly 1, and then the second light source output assembly 3 arranged toward the reflecting galvanometer 2 is arranged.

In one embodiment, referring to FIG. 1, the mirror 2 is angled at 40-70 degrees from the first direction. In addition, according to the ergonomic principle, be 40-70 degrees contained angles with the central axis of welding body 6 with handle body 7 and set up, be convenient for operating personnel hold, help promoting the use experience.

In one embodiment, referring to fig. 2 to 5, the first light source output assembly 1 includes a first alignment module, the first alignment module includes a quartz rod 34, a first alignment lens 33, a second alignment lens 11, a first barrel 12 adjusting seat 14, and a plurality of fasteners 15, and the quartz rod 34, the first alignment lens 33, and the second alignment lens 11 are sequentially connected to the first barrel 12.

Specifically, referring to fig. 2, a plurality of mounting holes 140 are uniformly distributed in the circumferential direction of the adjusting seat 14, one end of the fastening member 15 is connected to the adjusting seat 14 through the mounting holes 140, the other end of the fastening member 15 abuts against the circumferential side wall of the first lens barrel 12, and the angle of the first lens barrel 12 can be adjusted by the fastening member 15, so that the angle of the first lens barrel 12 is finely adjusted within a predetermined range, so as to adjust the distance between the focal points of the first laser beam 10 and the second laser beam 30 on the surface of the workpiece 80 to be welded.

Specifically, fine adjustment of the angle of the first barrel 12 is achieved by the locking force of each fastener.

In one embodiment, please continue to refer to fig. 3, the handheld welding gun further includes a connecting base 63, and the first barrel 12 is press-fitted into the transition cavity 62 through the connecting base 63. The cross section of the connecting seat 63 is U-shaped and just fits with the circumferential side wall of the first lens barrel 12, so as to improve the output stability of the first laser beam 10 and further improve the position accuracy of the preheating light spot.

In one embodiment, referring to fig. 1 and 6, the handheld welding gun further includes a protective mirror 5, where the protective mirror 5 is disposed in the mounting cavity 61, and the reflecting galvanometer 2, the focusing mirror 4, and the protective mirror 5 are sequentially connected in an optical path. The protecting mirror 5 is used for protecting the reflecting galvanometer 2 and the focusing mirror 4 from the impact of welding slag splashed on the surface of the workpiece 80 to be welded, so that the service lives of the optical components are prolonged.

Alternatively, the number of the protection mirrors 5 is set to be plural, and the plural protection mirrors 5 are arranged at intervals in the first direction X. For example, as shown in fig. 6 in the present application, the protective mirrors 5 are provided in two.

Further, the protective mirror 5 adopts a drawer type box structure, and can be detachably arranged on the welding body 6 by arranging an elastic buckle or fastening a fastener.

In one embodiment, the focal distance between the first laser beam 10 and the second laser beam 30 on the surface of the workpiece 80 to be welded is 0.5-1.5mm. For example: the spacing is 0.5mm; the spacing is 0.8mm; the pitch is 1.5mm or the like, and is not exemplified herein.

In one embodiment, please continue to refer to fig. 1, 4 and 5, the focusing lens 4 is configured as a detachable box structure, and the angle of the focusing lens can be adjusted by the locking force of the corresponding locking screw 41.

With continued reference to fig. 4 and 5, the housing structure of the focusing lens 4 includes a focusing lens 40 and a mounting housing 42 for fixing the focusing lens 40, wherein a guiding hole 421 having a first direction and a predetermined length is provided on a sidewall of the mounting housing 42, a rotating shaft 44 extending outwards from an edge of the focusing lens 40 is provided on a circumferential sidewall of the focusing lens 40, the rotating shaft 44 is symmetrically arranged along one diameter of the focusing lens 40, and two rotating shafts 44 of the focusing lens 40 are respectively in one-to-one correspondence and rotatably connected to the mounting housing 42.

In addition, a connecting column 43 is further provided on the focusing lens 40 in a diameter extending direction parallel to the symmetry line of the two rotating shafts 44, the locking screw 41 is connected to the connecting column 43 through a guiding hole 421, and the focusing lens 40 is fine-tuned in angle by freely adjusting the locking force of the locking screw 41 and matching with the guiding hole 421, so as to achieve fine-tuning of defocus amounts of the first laser beam 10 and the second laser beam 30 on the surface of the workpiece 80 to be welded.

Optionally, referring to fig. 6, the second light source output assembly 3 includes a second collimating module, where the second collimating module includes a quartz rod 34, a first collimating lens 33, a second collimating lens 11, a second lens barrel 32, an adjusting seat 14, and a plurality of fasteners 15, and the quartz rod 34, the first collimating lens 33, and the second collimating lens 11 are sequentially connected to the second lens barrel 32.

Further, the hand-held welding gun of the present application further comprises a control mechanism (not shown in the drawings) and an angle measuring sensor for measuring the angle of the focusing lens 40 and/or for measuring the angle of the reflecting galvanometer, the control mechanism is electrically connected with the angle measuring sensor, the angle measuring sensor is used for measuring the deflection angle of the focusing lens 40 and transmitting the measured information to the control mechanism, and the control mechanism controls the displacement of the platform for bearing the workpiece 80 to be welded along the welding direction.

It will be appreciated that the spots of the first laser beam 10 and the second laser beam 30 of the present application are arranged one behind the other in the welding direction. In the actual welding process, the adjustment of the width of the welding seam can be realized by fine adjustment of the angle of the reflecting vibrating mirror 2. Moreover, the working time length of the first laser beam 10 and the working time length of the second laser beam 30 can be freely adjusted according to practical situations.

Further, the hand-held welding gun of the present application may be configured as a hand-held welding gun, and in other cases may be configured as a detachable laser welding head, without limitation.

Further, the selection of the wavelength band of the laser beam in the present application may be flexibly set according to the characteristic of the workpiece 80 to be welded for absorption of the laser wavelength band, and is not limited to 1080nm and 915nm; or 1064nm and 975nm.

In addition, the first laser and the second laser in the application can synchronously work in certain time periods, and can work back and forth in other time periods, namely, the first laser emits light for a preset time in advance, and the second laser emits light.

Also, the first laser beam and the first laser beam of the present application may be coaxially disposed for some periods of time, and a predetermined interval may be formed for other periods of time. The protection focus is not described in detail herein.

Optionally, a detachable rear cover 60 is provided at the end of the welding body 6, that is, near the first light source output assembly 1, the first light source output assembly 1 is fixed inside the welding body 6 by a fastener and a fastening structure, and the end of the first light source output assembly 1 abuts against the rear cover 60. Further, a step structure (not shown) is provided on the rear cover 60 at a position corresponding to the first light source output assembly 1, so that a corresponding buckle and a fastener form a limiting position for the first light source output assembly 1. Wherein the first light source output assembly 1 and the galvanometer motor 64 are closely adjacent, and the structure is compact.

Alternatively, in order to adapt the first laser beam 10 and the second laser beam 30 to form a predetermined interval on the surface of the workpiece 80 to be welded, the nozzles of the hand-held welding gun are arranged in a corresponding prolate-type structure.

With respect to the structure of the present application, the length dimensions of the second quartz rod 31 and the quartz rod 34 may also be 8mm, 12mm, 20mm, etc., and may be specifically adjusted according to the size of the structure and the welding body 6. And the focal length of the focusing lens 4 can be selected to be 150mm or 120mm, and particularly can be flexibly selected according to the material of the workpiece to be welded.

The second laser beam 30 of the second light source output assembly 3 has the following trend: the 1080nm collimated light beam output by the second collimation module of the second light source output assembly 3 is preferably incident to the reflecting galvanometer 2 at 60 degrees, then reflected and focused by the focusing mirror 4, and then sequentially passes through the two protecting mirrors 5 to reach the focal position of the surface of the workpiece to be welded.

Wherein the reflecting galvanometer 2 swings + -1.4 degrees to scan the laser line width at the nozzle 6mm. The first laser beam 10 of the first light source output assembly 1 has the following trend: the first collimation module of the first light source output assembly 1 penetrates through the reflecting galvanometer 2 along a first direction X, is focused by the focusing mirror 4, sequentially penetrates through the two protecting mirrors 5 and reaches the focal position of the surface of the workpiece to be welded.

Alternatively, for the workpieces to be welded of aluminum materials, the power of the laser light source of the second light source output assembly 3 is about 1000-1500W, and the power of the laser light source of the first light source output assembly 1 is about 600-1000W. The above is only one mode of selection implemented by the above structural scheme.

As described above, the present utility model has the following advantages:

1. the handheld welding gun fits different output wavelengths into the same device, so that the handheld welding gun with a compact structure and perfect functions is obtained, and the problems that a traditional single-wavelength output laser cannot process different materials in a targeted manner and has low processing efficiency and quality are solved;

2. the handheld welding gun has stronger operability, flexible operation and portability;

3. the focusing mirror of the handheld welding gun and the light emergent angle of the first laser can be freely fine-tuned, so that the handheld welding gun is more flexible in use and higher in universality; and the operation precision and the welding quality are greatly improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The utility model provides a handheld welding gun, includes welding body (6) and handle body (7) that are connected, the extending direction of handle body (7) with welding body (6) are crossing, welding body (6) have along the transition chamber (62) and installation cavity (61) of first direction intercommunication each other in proper order, the inner chamber of handle body (7) communicate in transition chamber (62) with installation cavity (61) are linked together position department, its characterized in that, handheld welding gun still includes:

the focusing mirror (4) and the reflecting galvanometer (2), and the reflecting galvanometer (2) and the focusing mirror (4) are sequentially and detachably arranged in the mounting cavity (61) along a first direction;

the first light source output assembly (1) is detachably arranged in the transition cavity (62) and is positioned at one side of the reflecting vibrating mirror (2), the first light source output assembly (1) is used for generating a first laser beam (10), and the first laser beam (10) is transmitted along the first direction;

the second light source output assembly (3) is detachably arranged in the handle body (7) and is positioned on the other side of the opposite arrangement of the reflecting vibrating mirror (2), the second light source output assembly (3) is used for generating a second laser beam (30), the second laser beam (30) passes through the reflecting vibrating mirror (2) and then is transmitted along the first direction, and the focuses of the first laser beam (10) and the second laser beam (30) on the surface of a workpiece to be welded are distributed at preset intervals along a welding line.

2. The hand-held welding gun of claim 1, wherein: the reflecting galvanometer (2) is coated with a film and is configured to be transparent to the first laser beam (10) and to reflect the second laser beam (30).

3. The hand-held welding gun of claim 2, wherein: the handheld welding gun further comprises a vibrating mirror motor (64), wherein the vibrating mirror motor (64) is arranged in the transition cavity (62) and is positioned at the lower side of the first light source output assembly (1).

4. The hand-held welding gun of claim 1, wherein: the reflecting vibrating mirror (2) and the first direction form an included angle of 40-70 degrees; the handle body (7) and the central axis of the welding body (6) form an included angle of 40-70 degrees.

5. The hand-held welding gun of claim 1, wherein: the first light source output assembly (1) comprises a first collimation module, the first collimation module comprises a quartz rod (34), a first collimation lens (33), a second collimation lens (11), a first lens cone (12) adjusting seat (14) and a plurality of fasteners (15), the quartz rod (34) the first collimation lens (33) the second collimation lens (11) are sequentially connected to the first lens cone (12), a plurality of evenly distributed mounting holes (140) are formed in the circumference of the adjusting seat (14), one end of each fastener (15) is connected to the adjusting seat (14) through the corresponding mounting hole (140), the other end of each fastener (15) is in butt against the corresponding first lens cone (12), and the angle of each first lens cone (12) can be adjusted through the corresponding fastener (15) so as to adjust the distance between focuses of the first laser beam (10) and the second laser beam (30) on the surface of a workpiece to be welded.

6. The hand-held welding gun of claim 5, wherein: the handheld welding gun further comprises a connecting seat (63), and the first lens barrel (12) is pressed into the transition cavity (62) through the connecting seat (63).

7. The hand-held welding gun of claim 1, wherein: the handheld welding gun further comprises a protective mirror (5), wherein the protective mirror (5) is arranged in the installation cavity (61), and the reflecting vibrating mirror (2), the focusing mirror (4) and the protective mirror (5) are connected in sequence in an optical path.

8. The hand-held welding gun of any of claims 1-7, wherein: the focal distance between the first laser beam (10) and the second laser beam (30) on the surface of the workpiece to be welded is 0.5-1.5mm.

9. The hand-held welding gun of claim 1, wherein: the first light source output assembly (1) comprises a first laser with the wavelength of 915mm or 975mm;

the second light source output assembly (3) comprises a second laser with a wavelength of 1080mm or 1064mm.

10. The hand-held welding gun of claim 1, wherein: the focusing lens (4) is configured into a detachable box structure, and the angle of the focusing lens can be adjusted by the locking force of the corresponding locking screw (41).