Titanium steel dissimilar metal welding device and method based on infrared laser-blue laser and application

Abstract

The invention provides a titanium steel dissimilar metal welding device and method based on infrared laser and blue laser and application, and belongs to the technical field of hybrid welding, the device comprises a laser system installed on a six-axis mechanical arm, and the laser system comprises a beam splitting module, a blue laser collimation module and an infrared laser collimation module; the beam splitting module is connected with the CCD visual sensing module, the CCD visual sensing module is connected with the video monitor and the light path reflection device, the video monitor is connected with the terminal controller, the infrared laser alignment module is connected with the infrared laser, the blue laser alignment module is connected with the blue laser, and the blue laser alignment module is connected with the light path reflection device. The blue laser and the infrared laser are respectively connected with the water cooling device through pipelines, and the water cooling device is connected with the composite laser controller. The method is high in process flexibility, adapts to different thicknesses and joint types by adjusting the laser power and the wire feeding speed, overcomes the problems that a molten pool is unstable and interface bonding is poor in dissimilar metal welding, and provides a reliable scheme for complex structure welding.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite welding, and particularly relates to an infrared laser - blue laser dissimilar titanium - steel metal welding device, method and application. Background Art

[0002] As a high - precision and high - efficiency connection technology, laser welding is widely used in the manufacturing industry. With the growth of industrial demands, especially the increasing demand for dissimilar metal welding (such as titanium and steel, aluminum and steel), the limitations of traditional single - wavelength lasers (such as infrared lasers) are gradually emerging. Infrared lasers (wavelengths of about 1064 nm or 10.6 μm) perform well in welding low - reflectivity metals (such as steel), but have a low absorption rate for high - reflectivity metals (such as copper, aluminum) (copper is only about 5%), resulting in problems such as low energy efficiency, excessive spatter, and porosity defects.

[0003] In recent years, the development of blue lasers (wavelengths of about 450 nm) has provided a new way to solve this problem. Due to its short - wavelength characteristics, the absorption rate of blue lasers on high - reflectivity metals such as copper and aluminum is significantly increased, enabling more efficient energy transfer and a more stable welding process. However, the penetration depth and heating efficiency of blue lasers on traditional materials such as steel are not as good as those of infrared lasers. Therefore, combining infrared lasers and blue lasers to form a red - blue laser composite welding technology provides a new type of composite welding solution for controlling the heat efficiency of dissimilar metal welding and suppressing intermetallic compounds, aiming to integrate the advantages of the two lasers and optimize the welding quality of dissimilar metals.

[0004] Domestic patents mainly focus on single - laser welding or the optimization of composite processes, and there is no systematic research on red - blue laser combination. In the existing technology, Patent 1: Publication number is CN103753021A, patent name is Laser Welding Method of Red Copper and Brass; Patent 2: Publication number is CN103817451A, patent name is Oxygen - Free Copper Composite Welding Method; Patent 3: CN113319452B, patent name is A Double - Arc Double - Gas - Flow - Protected High - Strength Steel Fused Deposition Apparatus and Method. Although these three patents involve dissimilar metal welding, they lack specific descriptions of the cooperation between red and blue lasers, and the research is still in its initial stage. International Patent 1: Publication number is US10940562B2, patent name is Method and System for Welding Copper Using Blue Laser; International Patent 2: EP3704772A1, patent name is Multi - Kilowatt - Class Blue Laser System, which is leading in the field of blue laser welding, with a high technology maturity and has entered industrial application, but only focuses on the use of blue lasers and does not disclose the technical introduction of the cooperation between red and blue lasers. Summary of the Invention

[0005] The object of the present invention is to provide a device, method and application for welding dissimilar metals of titanium and steel based on infrared laser - blue laser to optimize the problems of traditional infrared laser reflectivity and heat input control in welding dissimilar metals of titanium and steel, and to achieve high - quality welding of dissimilar metals of titanium and steel.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A device for welding dissimilar metals of titanium and steel based on infrared laser - blue laser, comprising: a laser system installed on a six - axis robotic arm, the laser system including a beam - splitting module, a blue - laser collimation module, and an infrared - laser collimation module, the beam - splitting module being connected to a CCD vision sensing module, the CCD vision sensing module being respectively connected to a video monitor and an optical path reflection device, the video monitor being connected to a terminal controller, the infrared - laser collimation module being connected to an infrared laser, the blue - laser collimation module being connected to a blue laser, the blue laser and the infrared laser being respectively connected to a water - cooling device through pipelines, and the water - cooling device being connected to a composite laser controller.

[0008] Further, a laser welding gun nozzle is provided below the beam - splitting module, and a steel plate and a titanium plate are provided below the laser welding gun nozzle, and the steel plate and the titanium plate are respectively fixed on a horizontal workbench.

[0009] Further, the center of the visible - light total - reflection lens Ⅰ of the optical path reflection device and the center of the visible - light reflection lens Ⅱ of the beam - splitting module are on the same horizontal line, and the collected molten - pool image returns to the CCD camera through the visible - light total - reflection lens Ⅰ and the visible - light reflection lens Ⅱ and is presented on the video monitor.

[0010] Further, the centers of the infrared - laser total - transmission combined lens, the blue - laser total - transmission combined lens of the beam - splitting module and the blue - laser total - transmission collimation lens of the blue - laser collimation module are on the same vertical line.

[0011] Further, the centers of the infrared - laser total - transmission collimation lens and the infrared - laser total - reflection lens of the infrared - laser collimation module are on the same vertical line.

[0012] The present invention may further include:

[0013] A welding method for the above - mentioned device for welding dissimilar metals of titanium and steel based on infrared laser - blue laser, the method comprising the following steps:

[0014] Step 1: Connect and fix a steel plate and a titanium plate with a thickness of 0 - 2 mm to a horizontal workbench, clean the surfaces of the steel plate and the titanium plate with acetone, start the water - cooling device to ensure the stable temperature of the blue laser and the infrared laser; set initial parameters through the composite laser controller;

[0015] Step 2: The blue laser outputs a beam through the blue laser collimation module, and the beam is focused by the optical path reflection device at a position 0.5 - 1 mm away from the side interface of the titanium plate; the infrared laser outputs a beam through the infrared laser collimation module, and the beam is focused on the side of the steel plate through the beam splitting module; adjust the nozzle of the laser welding torch so that the diameter of the blue light spot is 0.2 mm and the diameter of the infrared light spot is 0.5 mm;

[0016] Step 3: Start the CCD vision sensing module, collect the weld image through the beam splitting module, transmit it to the video monitor, and the terminal controller analyzes the image to calibrate the laser position to ensure that the focus of the blue laser is 1 mm away from the side interface of the titanium plate and the infrared laser is focused on the side of the steel plate;

[0017] Step 4: Turn on the blue laser, and the wire feeder feeds the copper-tin alloy wire. The blue laser melts the wire through the nozzle of the laser welding torch, and the liquid copper wets the surface of the titanium plate to form a brazing layer; observe the wetting state through the video monitor, and the terminal controller finely adjusts the wire feeding speed;

[0018] Step 5: Start the infrared laser, focus on the steel plate, melt the steel plate to form a molten pool; the infrared beam covers the interface, and part of the molten copper fuses with the steel molten pool; the CCD vision sensing module monitors the dynamics of the molten pool in real time, and the composite laser controller adjusts the infrared power to avoid overburning;

[0019] Step 6: The two lasers move in parallel, the blue laser continuously melts the wire, and the infrared laser expands the molten pool to the interface; finely adjust the beam angle through the optical path reflection device to ensure a smooth transition of the molten pool; the argon flow rate is 15 - 20 L / min and is ejected from the nozzle of the laser welding torch;

[0020] Step 7: After welding is completed, turn off the blue laser and the infrared laser, keep the argon protection for 5 - 10 seconds, and cool naturally.

[0021] Further, the initial parameters in Step 1: the power of the blue laser is 1000 - 1200 W, the power of the infrared laser is 1800 - 2000 W, and the welding speed is 4 m / min.

[0022] Further, the connection method of the steel plate and the titanium plate in Step 1 includes butt joint or lap joint, the gap is controlled within 1 - 2 mm, and the lap width is 2 - 3 mm to ensure a flat contact surface.

[0023] Further, the angle of the wire feeder in Step 4 is 30 - 45°, and the wire feeding speed is 3 m / min.

[0024] The present invention may further include:

[0025] An application of an infrared laser - blue laser titanium - steel dissimilar metal welding device, wherein the welding device or method is applied to the welding of 0 - 2 mm thick titanium - steel dissimilar metals for marine use.

[0026] The beneficial effects of the present invention are as follows:

[0027] Through this solution, the method of the present invention realizes brazing by melting the copper wire with blue laser and the titanium side, and melting the steel side with infrared laser to form a fusion welding zone. Using copper as a transition layer effectively isolates the direct contact between Ti and Fe, avoiding the formation of brittle compounds (such as TiFe2). The wetting effect of copper enhances the bonding force of the titanium side interface, while the deep penetration ability of infrared laser ensures the full fusion of the steel side molten pool, forming smooth Cu-Ti and Fe-Cu interfaces with a smooth transition.

[0028] Precisely control the brazing temperature of the titanium side (about 700 - 1000 °C) through blue laser to avoid melting the base material. At the same time, infrared laser efficiently melts the steel side to balance the heat input. The copper wire (melting point 1083 °C) acts as a heat buffer to fill the interface gap and relieve thermal stress. The process has strong flexibility and can adapt to different thicknesses and joint types (such as butt joints and lap joints) by adjusting the laser power and wire feeding speed, overcoming the problems of unstable molten pool and poor interface bonding in dissimilar metal welding, and providing a reliable solution for welding complex structures.

[0029] The method of the present invention improves the material utilization rate and reduces the waste of laser energy. The high absorption rate of blue laser for copper (55% - 65%) significantly improves the energy transmission efficiency, reducing the reflection loss compared with infrared laser (absorption rate 5% - 10%). The power required to melt the wire is reduced by about 30% - 50% (from 3 - 4 kW for single laser to 1 - 1.2 kW). The deep penetration ability of infrared laser for steel (absorption rate 20% - 35%) ensures the efficient utilization of the base material and avoids material burning caused by overheating. Brief Description of the Drawings

[0030] Attached Figure 1 is a schematic structural diagram of the present invention.

[0031] Attached Figure 2 is a schematic diagram of the optical path principle of infrared laser - blue laser of the present invention.

[0032] In the drawings: 1. Video monitor; 2. Optical path reflection device; 3. CCD vision sensing module; 4. Terminal controller; 5. Beam splitting module; 6. Laser welding torch nozzle; 7. Blue laser; 8. Blue laser collimation module; 9. Infrared laser; 10. Infrared laser collimation module; 11. Water cooling device; 12. Composite laser controller; 13. Steel plate; 14. Titanium plate;

[0033] 3-1, CCD camera; 2-1, visible light total reflection lens I; 5-1, visible light reflection lens II; 5-2, infrared laser total transmission combined lens; 5-3, blue laser total transmission combined lens; 8-1, blue laser total transmission collimating lens; 10-1, infrared laser total transmission collimating lens; 10-2, infrared laser total reflection lens; 15, infrared laser focus; 16, blue laser focus. Detailed implementation mode

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Embodiment 1:

[0036] An infrared laser - blue laser titanium - steel dissimilar metal welding device, as shown in the attached Figure 1 figure, includes: a laser system installed on a six - axis robotic arm. The laser system includes a beam splitting module 5, a blue laser collimating module 8, and an infrared laser collimating module 10. The beam splitting module 5 is connected to a CCD vision sensing module 3. The CCD vision sensing module 3 is respectively connected to a video monitor 1 and an optical path reflection device 2. The video monitor 1 is connected to a terminal controller 4. The infrared laser collimating module 10 is connected to an infrared laser 9. The blue laser collimating module 8 is connected to a blue laser 7. The blue laser 7 and the infrared laser 9 are respectively connected to a water - cooling device 11 through pipelines. The water - cooling device 11 is connected to a composite laser controller 12.

[0037] Below the beam splitting module 5, there is a laser welding torch nozzle 6. Below the laser welding torch nozzle 6, there are a steel plate 13 and a titanium plate 14. The steel plate 13 and the titanium plate 14 are respectively fixed on a horizontal workbench for welding.

[0038] In this embodiment, the beam splitting module 5 is used to separate the laser optical path and the vision monitoring optical path.

[0039] The CCD vision sensing module 3 collects the image of the welding area in real - time.

[0040] The video monitor 1 displays the weld state and accepts control commands.

[0041] The optical path reflection device 2 adjusts the laser optical path to ensure that the beam is aligned with the weld.

[0042] The blue laser 7 outputs a collimated beam through the blue laser collimating module 8, with a power of 1.5 kW.

[0043] The infrared laser 9 outputs a collimated beam through the infrared laser collimating module 10 and an optical fiber, with a power of 2.5 kW.

[0044] The water cooling device 11 is respectively connected to the blue laser 7 and the infrared laser 9 through pipelines to keep the equipment running stably.

[0045] The composite laser controller 12 adjusts the light source parameters of the blue laser 7 and the infrared laser 9, such as power and frequency parameters.

[0046] As attached Figure 2 As shown, the centers of the visible light total reflection lens Ⅰ 2-1 of the optical path reflection device 2 and the visible light reflection lens Ⅱ 5-1 of the beam splitting module 5 are on the same horizontal line. The collected molten pool image returns to the CCD camera 3-1 through the visible light total reflection lens Ⅰ 2-1 and the visible light reflection lens Ⅱ 5-1 and is presented on the video monitor. The centers of the infrared laser total transmission combined lens 5-2 and the blue laser total transmission combined lens 5-3 of the beam splitting module 5 and the blue laser total transmission collimating lens 8-1 of the blue laser collimating module 8 are on the same vertical line. The centers of the infrared laser total transmission collimating lens 10-1 and the infrared laser total reflection lens 10-2 of the infrared laser collimating module 10 are on the same vertical line.

[0047] The present invention provides a method for welding titanium-steel dissimilar metals based on infrared laser-blue laser. The titanium-steel dissimilar metal weld is welded by the method of infrared laser-blue laser composite welding. To avoid the metallurgical combination of Ti and Fe elements during the titanium-steel welding process, a copper-based welding wire is used as the filler metal. According to the different absorption rates, a purple copper welding wire with an absorption rate of 55% - 65% is selected. The main difficulties of this scheme are mainly concentrated on the heat control on the titanium side and the copper-steel welding. Since the absorption rate of copper for infrared laser is low (5% - 10%), the energy efficiency is not high, while the short wavelength of the blue laser makes its absorption rate increase significantly (about 50% - 65%), which is used to melt the copper welding wire and the titanium side to complete the brazing. The infrared laser is mainly used to melt the steel side base material and make an effective connection with the filler metal. By combining the infrared and blue lasers, the heat input, molten pool stability and joint quality of the titanium-steel dissimilar metal welding can be optimized.

[0048] Furthermore, this embodiment also includes a welding method of a welding device for titanium-steel dissimilar metals based on infrared laser-blue laser as described above. This method includes the following steps:

[0049] Step 1: Wipe the surfaces of Ti-6Al-4V titanium alloy and 304 stainless steel with acetone to remove oil stains and oxides. Sand the titanium side to reduce the surface roughness to reduce the blue light absorption.

[0050] Step 2: Fix the base materials on the horizontal workbench with jigs. The plate thickness is 0 - 2 mm. The connection method includes butt joint or lap joint (lap width 2 - 3 mm), and the gap is controlled within 1 - 2 mm to ensure the contact surface is flat.

[0051] Step 3: Adjust the focus of the blue laser to deviate 0.5 - 1 mm from the titanium-side interface, and the focus of the infrared laser to be biased towards the steel side. Set the angle of the wire feeder (30° - 45°), and align the welding wire with the steel-side interface;

[0052] Step 4: Adjust the welding process parameters: Set the blue laser power to 1000 - 1200 W (a blue laser power > 1500 W will cause the titanium alloy to melt), which is used to melt the copper wire and preheat the titanium-side interface. Set the infrared laser power to 1800 - 2000 W, which is used to melt the steel-side base material. Set the welding speed to 4 m / min, the wire feeding speed to 3 m / min, select argon as the shielding gas, and the flow rate to 15 - 20 L / min;

[0053] Step 5: Start the blue laser and the infrared laser simultaneously, and feed in the copper wire. The blue laser melts the wire (melting point 1083 °C), and the liquid copper wets the titanium surface to form a brazing layer. The infrared laser focuses on the steel side, melts the steel-side base material and forms a molten pool;

[0054] Step 6: After welding, maintain argon shielding for 5 - 10 seconds, and cool naturally to room temperature to avoid stress concentration caused by rapid cooling.

[0055] In this embodiment, the melting points of Ti-6Al-4V titanium alloy (melting point 1668 °C) and 304 stainless steel (melting point about 1450 °C) differ greatly. Traditional welding is likely to cause overheating of titanium or incomplete melting of steel, and the difference in thermal expansion coefficients (titanium 8.6×10 -6 / K, steel 17.3×10 -6 / K) is also likely to cause stress concentration.

[0056] Example 2:

[0057] Based on the welding method of the infrared laser - blue laser titanium-steel dissimilar metal welding device described in Example 1, it is further elaborated in detail. This method includes the following steps:

[0058] Step 1: Butt-join and fix the steel plate 13 and the titanium plate 14 on a horizontal workbench with a gap of 0.1 - 0.2 mm. Clean the surfaces of the two plates with acetone. Start the water cooling device 11 to ensure the stable temperature of the blue laser 7 and the infrared laser 9. Set the initial parameters through the composite laser controller 12: blue laser power 1.2 kW, infrared laser power 2 kW, welding speed 4 m / min;

[0059] Step 2: The blue laser 7 outputs a beam through the blue laser collimation module 8, and is focused on a position 1 mm away from the interface of the titanium plate 14 through the optical path reflection device 2. The infrared laser 9 outputs a beam through the infrared laser collimation module 10, and is focused on the steel plate 13 side through the beam splitting module 5. Adjust the nozzle 6 of the laser welding torch so that the diameter of the blue laser spot is 0.2 mm and the diameter of the infrared laser spot is 0.5 mm;

[0060] Step 3: Start the CCD vision sensing module 3, collect the weld image through the beam splitting module 5, and transmit it to the video monitor 1. The terminal controller 4 analyzes the image, calibrates the laser position, and ensures that the blue laser focus deviates 1 mm from the interface of the titanium plate 14 side, and the infrared laser is focused on the steel plate 13 side.

[0061] Step 4: Turn on the blue laser 7 with a power of 1.2 kW. The wire feeder feeds the copper wire at a speed of 3 m / min. The blue laser melts the wire (melting point 1083 °C) through the nozzle 6 of the laser welding torch. The liquid copper wets the surface of the titanium plate 14 to form a brazing layer. Observe the wetting state through the video monitor 1, and the terminal controller 4 finely adjusts the wire feeding speed.

[0062] Step 5: Start the infrared laser 9 with a power of 2 kW, focus on the steel plate 13, melt the AISI 304 (melting point about 1450 °C) to form a molten pool. The infrared beam covers the interface, and part of the molten copper fuses with the steel molten pool. The CCD vision sensing module 3 monitors the dynamics of the molten pool in real time, and the composite laser controller 12 adjusts the infrared power to avoid overburning.

[0063] Step 6: The two lasers move in parallel at a speed of 4 m / min. The blue laser continuously melts the wire, and the infrared laser expands the molten pool to the interface. Fine-tune the beam angle through the optical path reflection device 2 to ensure a smooth transition of the molten pool. The argon flow rate is 15 L / min and is ejected from the nozzle (6) of the laser welding torch.

[0064] Step 7: After welding is completed, turn off the blue laser 7 and the infrared laser 9, maintain the argon protection for 5 - 10 seconds, and cool naturally.

[0065] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A titanium steel dissimilar metal welding device based on infrared laser-blue laser, characterized in that: include: A laser system installed on a six-axis mechanical arm comprises a beam splitting module (5), a blue laser collimation module (8), and an infrared laser collimation module (10); the beam splitting module (5) is connected to a CCD visual sensor module (3); the CCD visual sensor module (3) is respectively connected to a video monitor (1) and an optical path reflection device (2); the video monitor (1) is connected to a terminal controller (4); the infrared laser collimation module (10) is connected to an infrared laser (9); the blue laser collimation module (8) is connected to a blue laser (7); the blue laser (7) and the infrared laser (9) are respectively connected to a water cooling device (11) through pipelines; and the water cooling device (11) is connected to a composite laser controller (12).

2. The infrared laser-blue light laser titanium steel dissimilar metal welding device according to claim 1 is characterized in that: A laser welding gun nozzle (6) is provided below the beam splitting module (5), and a steel plate (13) and a titanium plate (14) are provided below the laser welding gun nozzle (6), wherein the steel plate (13) and the titanium plate (14) are respectively fixed on a horizontal workbench.

3. The infrared laser-blue laser titanium-steel dissimilar metal welding device according to claim 1 is characterized in that: The centers of the visible light total reflection lens I (2-1) of the optical path reflection device (2) and the visible light reflection lens II (5-1) of the beam splitting module (5) are located on the same horizontal line, and the collected molten pool image is returned to the CCD camera (3-1) through the visible light total reflection lens I (2-1) and the visible light reflection lens II (5-1) and is presented on the video monitor (1).

4. The infrared laser-blue laser titanium-steel dissimilar metal welding device according to claim 1 is characterized in that: The centers of the infrared laser full-transmission combined lens (5-2), the blue laser full-transmission combined lens (5-3) of the beam splitting module (5) and the blue laser full-transmission collimating lens (8-1) of the blue laser collimating module (8) are maintained on the same vertical line.

5. The infrared laser-blue light laser titanium steel dissimilar metal welding device according to claim 1 is characterized in that: The centers of the infrared laser total transmission collimating lens (10-1) and the infrared laser total reflection lens (10-2) of the infrared laser collimating module (10) are maintained on the same vertical line.

6. A welding method based on an infrared laser-blue light laser titanium steel dissimilar metal welding device as described in any one of claims 1 to 5, characterized in that: The method comprises the following steps: Step 1: Connect and fix a steel plate (13) and a titanium plate (14) with a thickness of 0-2 mm on a horizontal workbench, clean the surface of the steel plate (13) and the titanium plate (14) with acetone, start the water cooling device (11) to ensure that the temperature of the blue laser (7) and the infrared laser (9) is stable; set the initial parameters through the composite laser controller (12); Step 2: The blue laser (7) outputs a light beam through the blue laser collimation module (8), and is focused on a position 0.5 to 1 mm away from the side interface of the titanium plate (14) through the optical path reflection device (2); the infrared laser (9) outputs a light beam through the infrared laser collimation module (10), and is focused on the side of the steel plate (13) through the beam splitting module (5); the laser welding gun nozzle (6) is adjusted so that the blue light spot diameter is 0.2 mm and the infrared spot diameter is 0.5 mm; Step 3: Start the CCD visual sensor module (3), collect the weld image through the beam splitting module (5), transmit it to the video monitor (1), and the terminal controller (4) analyzes the image and calibrates the laser position to ensure that the blue laser focus deviates from the titanium plate (14) side interface by 1 mm, and the infrared laser is focused on the steel plate (13) side; Step 4: Turn on the blue laser (7), feed the copper welding wire through the wire feeder, melt the welding wire through the laser welding gun nozzle (6), and the liquid copper wets the surface of the titanium plate (14) to form a brazing layer; observe the wetting state through the video monitor (1), and fine-tune the wire feeding speed through the terminal controller (4); Step 5: Start the infrared laser (9), focus on the steel plate (13), melt the steel plate (13), and form a molten pool; the infrared beam covers the interface, and part of the molten copper merges with the steel molten pool; the CCD visual sensor module (3) monitors the dynamics of the molten pool in real time, and the composite laser controller (12) adjusts the infrared power to avoid overburning; Step 6: The two lasers move in parallel, the blue light continuously melts the welding wire, and the infrared light expands the molten pool to the interface; the beam angle is fine-tuned through the optical path reflection device (2) to ensure a smooth transition of the molten pool; the argon gas flow rate is 15-20L / min, and is ejected from the laser welding gun nozzle (6); Step 7: After welding is completed, turn off the blue laser (7) and infrared laser (9), keep the argon gas protection for 5-10 seconds, and cool naturally.

7. The welding method based on infrared laser-blue light laser titanium steel dissimilar metal welding device according to claim 6 is characterized in that: The initial parameters in step 1 are: blue laser power is 1000-1200W, infrared laser power is 1800-2000W, and welding speed is 4m / min.

8. The welding method based on infrared laser-blue light laser titanium steel dissimilar metal welding device according to claim 6 is characterized in that: The connection method of the steel plate (13) and the titanium plate (14) in step 1 includes butt joint or overlap joint, the gap is controlled at 1 to 2 mm, and the overlap width is 2 to 3 mm to ensure that the contact surface is flat.

9. The welding method based on infrared laser-blue light laser titanium steel dissimilar metal welding device according to claim 6 is characterized in that: In step 4, the angle of the wire feeder is 30-45°, and the wire feeding speed is 3m / min.

10. An application of a titanium-steel dissimilar metal welding device based on infrared laser-blue light laser, the welding device having the structure described in any one of claims 1 to 5, or being used by the welding method described in any one of claims 6 to 9, characterized in that: The welding device or method is applied to the welding of titanium-steel dissimilar metals with a thickness of 0 to 2 mm for shipbuilding.

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