Slat laser device for online pre-welding treatment and post-welding modification

Abstract

The invention relates to the technical field of laser application, and particularly discloses an online pre-welding treatment and post-welding modification lath laser device which comprises a laser system, a power supply system, a cooling system, a shaping focusing system, a semi-reflecting mirror, a total reflecting mirror, a shielding gas system, a visual sensing system, a welding working platform system and a control system. Continuous laser is generated through the arranged optical fiber laser welding equipment for welding operation, a pulse laser beam generated by the pulse laser is divided into two beams through the semi-reflecting mirror, one beam can be used for removing an oxide layer on the surface of a welding sample on line before welding and exerting prestress on the surface at the same time, air holes are prevented from being generated during welding, cracks are reduced, and the welding quality is improved. And the other beam can be used for carrying out surface cleaning after welding and carrying out laser strengthening modification on a welding seam, so that the quality of the welding seam is improved, and the welding strength is improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser application, and in particular to a slab laser device for online pre-welding treatment and post-welding modification. Background Art

[0002] As an important processing technology in modern manufacturing, laser welding technology has been widely used in many manufacturing fields such as machinery and heavy industry, automobile, aerospace, petrochemical, etc. The working principle of laser welding is that a high-energy density beam emitted from a laser is focused to the welding joint position through a nozzle. The high heat energy converted from light energy causes the metal material to melt and complete the welding. As a more advanced welding process, compared with traditional welding methods, it has the advantages of high power density, small heat input, fast welding speed, large weld depth-to-width ratio, and small workpiece deformation, which makes laser welding have great application potential in production. However, due to the influence of various factors such as the storage environment, an oxide layer often appears on the surface of the workpiece to be welded. During the welding process, the oxide layer on the surface of the workpiece and the dust particles on the surface will be mixed into the weld during the welding process, affecting the welding quality of the workpiece and reducing the welding efficiency. In addition, due to the effect of thermal stress, the welded parts will deform to varying degrees, and it is easy to form defects such as cracks and residues, which further affects the quality of the workpiece and reduces the welding efficiency.

[0003] Therefore, it is necessary to propose a slab laser device for online pre-welding treatment and post-welding modification to overcome the defects of the prior art. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a slab laser device for online pre-welding treatment and post-welding modification.

[0005] The technical solution of the present invention is: A lath laser device for online pre-weld treatment and post-weld modification, comprising: Laser systems for generating continuous laser beams and pulsed laser beams; Shaping and focusing system, used for shaping and focusing the pulsed laser beam; A half-reflecting mirror, which is adapted to the laser system and is used to split the pulsed laser beam into a first laser beam and a second laser beam; A total reflection mirror, used to fully reflect the first laser beam to achieve post-processing of the weld; Shielding gas system, used to treat surface residues after welding and protect welding samples during subsequent laser shock modification process; A visual sensing system is used to locate the area where the laser beam impacts and control the laser beam to accurately hit the position to be impacted; Welding work platform system, used for fixing and moving welding samples; The control system, the laser system, the protective gas system, the visual sensor system and the welding workbench system are all electrically connected to the control system.

[0006] Preferably, the laser system includes a fiber laser welding device and a pulse laser, the fiber laser welding device is used to emit a continuous laser to achieve laser welding of the welding sample, and the pulse laser is used to emit a pulse laser beam.

[0007] Preferably, the shaping and focusing system includes a first shaping mirror and a first galvanometer mirror adapted to the first laser beam, and a second shaping mirror and a second galvanometer mirror adapted to the second laser beam.

[0008] Preferably, the protective gas system includes a nitrogen bottle, an electromagnetic pressure reducing valve and a pressure gauge, the electromagnetic pressure reducing valve and the pressure gauge are connected to the nitrogen bottle in sequence, and the electromagnetic pressure reducing valve is connected to a blowing pipe via a quick-plug connector.

[0009] Preferably, the visual sensing system is a CCD camera.

[0010] Preferably, the welding work platform system includes a mobile platform, the welding sample is arranged on the mobile platform, and a grating ruler is arranged at one end of the mobile platform.

[0011] Preferably, a slab laser device for online pre-weld processing and post-weld modification also includes a cooling system for cooling the laser system, the cooling system includes a first water cooler and a second water cooler, the first water cooler is connected to the fiber laser welding equipment, and the second water cooler is connected to the pulse laser.

[0012] Preferably, a slab laser device for online pre-weld processing and post-weld modification also includes a power supply system, which is electrically connected to the laser system to provide energy for the laser system.

[0013] Preferably, the control system includes a computer, a laser controller, a power controller, a protective gas controller, a mobile controller and a visual sensor controller, and the laser controller, the power controller, the protective gas controller, the mobile controller and the visual sensor controller are all electrically connected to the computer.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention generates continuous laser for welding operation through the fiber laser welding equipment provided. The pulse laser beam generated by the pulse laser is divided into two beams by a half-reflecting mirror. One beam can be used to remove the oxide layer on the surface of the welding sample before welding, and at the same time, prestress the surface to prevent the generation of pores during welding, reduce cracks, enhance welding stability and increase welding rate. The other beam can be used to clean the surface after welding, perform laser strengthening and modification on the weld, improve weld quality and increase welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the working principle diagram of the present invention; Figure 2 It is a structural block diagram of the present invention; Figure 3 It is a structural block diagram of the control system of the present invention; Figure 4 It is a schematic diagram of the structure of the protective gas system of the present invention; Figure 5 It is a schematic diagram of the structure of the pulse laser of the present invention.

[0016] Among them, 1. Laser system; 101. Fiber laser welding equipment; 1011. Continuous laser beam; 102. Pulsed laser; 1021. First laser beam; 1022. Second laser beam; 1023. Seed source; 1024. Pump source; 1025. Slat module; 1026. Waveguide coupling module; 2. Shaping and focusing system; 201. First shaping mirror; 202. First galvanometer; 203. Second shaping mirror; 204. Second galvanometer; 3. Half-reflecting mirror; 4. Full-reflecting mirror; 5. Protective gas system; 501. Nitrogen bottle; 502. 02. Solenoid pressure reducing valve; 503. Pressure gauge; 504. Quick connector; 505. Air blowpipe; 6. Visual sensor system; 7. Welding work platform system; 701. Mobile platform; 702. Welding sample; 703. Grating ruler; 8. Control system; 801. Computer; 802. Laser controller; 803. Power supply controller; 804. Protective gas controller; 805. Mobile controller; 806. Visual sensor controller; 9. Cooling system; 901. First water cooler; 902. Second water cooler; 10. Power supply system. DETAILED DESCRIPTION

[0017] In order to make the technical means, technical features, invention objectives and technical effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific illustrations.

[0018] like Figure 1-Figure 5 As shown, a slab laser device for online pre-welding treatment and post-welding modification includes a laser system 1, a power supply system 10, a cooling system 9, a shaping and focusing system 2, a half-reflecting mirror 3, a full-reflecting mirror 4, a protective gas system 5, a visual sensor system 6, a welding work platform system 7 and a control system 8.

[0019] like Figure 1 and Figure 5As shown, the laser system 1 is used to generate a continuous laser beam 1011 and a pulsed laser beam. The laser system 1 includes a fiber laser welding device 101 and a pulsed laser 102. The fiber laser welding device 101 is used to emit a continuous laser to generate a high-energy laser beam to achieve laser welding of the welding sample 702. The pulsed laser 102 is used to emit a high-quality pulsed laser beam. The pulsed laser 102 includes a seed source 1023, a pump source 1024, a slat module 1025 and a waveguide coupling module 1026, which are electrically connected to each other. All of them are applications of the prior art, and their specific structures are not described in detail here. In this embodiment, the processing frequency of the high-quality pulsed laser beam emitted by the pulsed laser 102 is 1-500Hz.

[0020] like Figure 1 and Figure 2 As shown, the power supply system 10 is electrically connected to the laser system 1, and is used to provide power to the fiber laser welding equipment 101 and the pulse laser 102 respectively to ensure normal operation.

[0021] like Figure 1 As shown, the cooling system 9 is connected to the laser system 1 and is used to cool the fiber laser welding equipment 101 and the pulse laser 102. The cooling system 9 includes a first water cooler 901 and a second water cooler 902. The first water cooler 901 is connected to the fiber laser welding equipment 101 through a PVC pipe. The PVC pipe connected between the first water cooler 901 and the fiber laser welding equipment 101 is connected with a joint, a clamp, a valve, a flow meter, a filter, etc. in sequence. The first water cooler 901 cools the fiber laser welding equipment 101, and the second water cooler 902 cools the fiber laser welding equipment 101. 902 is connected to the pulse laser 102 through a PVC pipe. The joints, clamps, valves, flow meters and filters are connected in sequence to the PVC pipe connected between the second water cooler 902 and the pulse laser 102. The second water cooler 902 cools the pulse laser 102. During cooling, the first water cooler 901 and the second water cooler 902 are turned on respectively. By setting the water cooling temperature, adjusting the valve opening, and coordinating with the flow meter to control the cooling water flow, the fiber laser welding equipment 101 and the pulse laser 102 are cooled respectively.

[0022] like Figure 1 and Figure 2 As shown, the visual sensing system 6 is used to locate the area impacted by the pulsed laser beam and control the laser beam to accurately hit the position to be impacted. The visual sensing system 6 adopts a CCD camera. The CCD camera can clearly and stably obtain real-time image information of the area to be welded through the matching lens, filter, camera fixture and light source.

[0023] like Figure 1As shown, the shaping and focusing system 2 is used for shaping and focusing the pulsed laser beam. The high-quality pulsed laser beam emitted by the pulsed laser 102 is reflected by the half-reflecting mirror 3 to reflect two laser beams, namely, a first laser beam 1021 and a second laser beam 1022. The shaping and focusing system 2 includes a first shaping mirror 201 and a first galvanometer mirror 202 adapted to the first laser beam 1021, and a second shaping mirror 203 and a second galvanometer mirror 204 adapted to the second laser beam 1022. The first shaping mirror 20 1 is used to shape the spot of the first laser beam 1021, and the first galvanometer 202 is used to control the focusing of the shaped first laser beam 1021 to accurately clean the located area, so that the first laser beam 1021 cleans the oxide layer and attached particles on the surface of the welding sample 702 at the most suitable angle and shape. After the second laser beam 1022 is totally reflected by the total reflection mirror 4, it is shaped and focused by the second shaping mirror 203 and the second galvanometer 204, so that the second laser beam 1022 can achieve the purpose of modifying the weld.

[0024] like Figure 1 , Figure 2 and Figure 4 As shown, the protective gas system 5 is used for processing the surface residue after welding and protecting the sample during the subsequent laser shock modification process. The protective gas system 5 includes a nitrogen bottle 501, an electromagnetic pressure reducing valve 502 and a pressure gauge 503. The electromagnetic pressure reducing valve 502 and the pressure gauge 503 are connected to the outlet of the nitrogen bottle 501 in sequence. The electromagnetic pressure reducing valve 502 is connected to a blow pipe 505 through a quick connector 504. After the welding is completed, the electromagnetic pressure reducing valve 502 is opened to provide gas protection for the subsequent welding modification treatment. At the same time, the airflow can clean the particles such as welding slag on the weld surface, and the pressure in the nitrogen bottle 501 can be observed through the pressure gauge 503.

[0025] like Figure 1 As shown, the welding work platform system 7 is used to fix and move the welding sample 702. The welding work platform system 7 includes a mobile platform 701. The welding sample 702 is installed on the mobile platform 701. The mobile platform 701 drives the welding sample 702 to move. The position of the welding sample 702 is adjusted according to the welding process to complete the welding pre-processing, welding process and welding post-processing. A grating ruler 703 is installed at one end of the mobile platform 701 for fixing the moving starting point of the welding sample 702 and controlling the moving stroke of the mobile platform 701. Different tooling fixtures can be installed on the mobile platform 701 for different welding samples 702, which can be conveniently adjusted according to different welding samples 702.

[0026] like Figure 1 and Figure 3As shown, the control system 8 includes a computer 801, a laser controller 802, a power controller 803, a shielding gas controller 804, a mobile controller 805 and a visual sensor controller 806. The laser controller 802, the power controller 803, the shielding gas controller 804, the mobile controller 805 and the visual sensor controller 806 are all electrically connected to the computer 801, the laser controller 802 is electrically connected to the fiber laser welding equipment 101 and the pulse laser 102 respectively, the power controller 803 is electrically connected to the power supply system 10, the shielding gas controller 804 is electrically connected to the electromagnetic pressure reducing valve 502, the mobile controller 805 is electrically connected to the mobile platform 701, and the visual sensor controller 806 is electrically connected to the CCD camera.

[0027] A lath laser device for online pre-welding pretreatment and post-welding modification comprises the following steps: S1. Clean the welding sample 702, use acetone to clean the oil stains in the welding area of ​​the welding sample 702, and then use distilled water to rinse the surface cleaned with acetone to avoid residual acetone reagent on the surface of the welding sample 702, and dry and store the cleaned sample 702 to be welded; S2. Place a fixed grating ruler 703 on the mobile platform 701 to limit the range of movement of the welding sample 702, and fix the welding sample 702 on the mobile platform 701 to ensure stability; S3. Turn on the first water cooler 901, set the water cooling temperature, and adjust the cooling water flow with the help of a flow meter to prepare for cooling the fiber laser welding equipment 101.

[0028] S4. Turn on the second water chiller 902, set the water cooling temperature, cooperate with the flow meter, adjust the cooling water flow, and prepare for cooling the pulse laser 102; S5. Turn on the CCD camera and locate the laser impact position through the computer 801 to prepare for emitting the laser; S6. The software used to drive the power controller 803 in the computer 801 sets the current size, frequency, pulse width and other related parameters to start the power supply system 10; S7. The software used to drive the protective gas controller 804 in the computer 801 sets the valve opening and air flow rate of the electromagnetic pressure reducing valve 502, and starts the protective gas system 5; S8. The laser parameters are set by the software for driving the laser controller 802 in the computer 801, the pulse laser 102 is started, and the pulse laser beam is emitted. The pulse laser beam is reflected by the half-reflecting mirror 3 to form a first laser beam 1021 and a second laser beam 1022. After the first laser beam 1021 is processed by the full-reflecting mirror 4, the first shaping mirror 201 and the first galvanometer 202, the welding sample 702 is moved in cooperation with the mobile platform 701 to complete the laser cleaning of the surface of the welding sample 702 in the area to be welded. At the same time, the separated second laser beam 1022 is prepared for the post-welding strengthening modification; S9. The laser parameters are set by the software for driving the laser controller 802 in the computer 801, the fiber laser welding equipment 101 is started, the continuous laser beam 1011 is emitted, and the welding sample 702 is moved with the mobile platform 701 to perform laser welding on the laser-cleaned area; S10. The second laser beam 1022 is shaped and focused by the second shaping mirror 203 and the second galvanometer 204, and the welding sample 702 is moved in cooperation with the mobile platform 701 to complete the strengthening and modification treatment of the welding sample 702 after welding; S11. The entire welding process is completed, and the laser system 1, the cooling system, and the protective gas system 5 are turned off in sequence to complete a workflow.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should belong to the technical scope of the present invention.

Claims

1. A lath laser device for online pre-weld treatment and post-weld modification, characterized in that: include: A laser system (1) for generating a continuous laser beam (1011) and a pulsed laser beam; A shaping and focusing system (2), used for shaping and focusing the pulsed laser beam; A semi-reflective mirror (3), the semi-reflective mirror (3) being adapted to the laser system (1) and being used to split the pulsed laser beam into a first laser beam (1021) and a second laser beam (1022); A total reflection mirror (4) is used to fully reflect the first laser beam (1021) to achieve post-processing of the weld; A protective gas system (5) is used to treat the surface residue after welding and to protect the welding sample during the subsequent laser shock modification process; A visual sensing system (6) is used to locate the area where the laser beam strikes and control the laser beam to accurately strike the position to be struck; A welding work platform system (7) for fixing and moving the welding sample (702); A control system (8), a laser system (1), a protective gas system (5), a visual sensor system (6) and a welding workbench system (7) are all electrically connected to the control system (8).

2. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The laser system (1) comprises a fiber laser welding device (101) and a pulse laser (102); the fiber laser welding device (101) is used to emit continuous laser light to achieve laser welding of a welding sample (702); and the pulse laser (102) is used to emit a pulse laser beam.

3. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The shaping and focusing system (2) comprises a first shaping mirror (201) and a first galvanometer (202) adapted to the first laser beam (1021), and a second shaping mirror (203) and a second galvanometer (204) adapted to the second laser beam (1022).

4. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The protective gas system (5) comprises a nitrogen bottle (501), an electromagnetic pressure reducing valve (502) and a pressure gauge (503), wherein the electromagnetic pressure reducing valve (502) and the pressure gauge (503) are connected to the nitrogen bottle (501) in sequence, and the electromagnetic pressure reducing valve (502) is connected to a gas blowing pipe (505) via a quick-connect connector (504).

5. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The visual sensing system (6) is a CCD camera.

6. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The welding work platform system (7) comprises a mobile platform (701), a welding sample (702) is arranged on the mobile platform (701), and a grating ruler (703) is arranged at one end of the mobile platform (701).

7. The lath laser device for online pre-weld treatment and post-weld modification according to claim 2, characterized in that: It also includes a cooling system (9) for cooling the laser system (1), the cooling system (9) including a first water cooler (901) and a second water cooler (902), the first water cooler (901) being connected to the optical fiber laser welding equipment (101), and the second water cooler (902) being connected to the pulse laser (102).

8. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: It also includes a power supply system (10), wherein the power supply system (10) is electrically connected to the laser system (1) to provide energy for the laser system (1).

9. The lath laser device for online pre-weld treatment and post-weld modification according to claim 1, characterized in that: The control system (8) comprises a computer (801), a laser controller (802), a power supply controller (803), a protective gas controller (804), a mobile controller (805) and a visual sensor controller (806); the laser controller (802), the power supply controller (803), the protective gas controller (804), the mobile controller (805) and the visual sensor controller (806) are all electrically connected to the computer (801).

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