Laser welding wide weld bead molten pool homogenization method

Abstract

The invention provides a laser welding wide weld bead molten pool homogenization method which comprises the steps that wire feeding parameters matched with laser welding and a welding base material are set, a flat welding wire is selected as a welding wire for laser welding, a laser beam matched with the flat welding wire is set, and a molten pool is formed at the focusing intersection of the laser beam and the base material. And the flat welding wire is fed into the molten pool according to the set wire feeding parameters, so that the uniform laser welding molten pool is formed, the uniformity of the molten pool is improved, and the welding quality and efficiency are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of laser welding, and in particular to a method for homogenizing a wide weld pool in laser welding. Background Art

[0002] Laser welding is widely used in high-tech fields such as first-of-its-kind equipment, automobiles, aerospace, and ships. At present, round welding rods are used in laser welding, also known as round wires or round welding wires. The molten pool formed by welding with a single round wire is narrow. For wide welds, multiple wire feeds are required, such as double round wire feeds, triple round wire feeds, and quad round wire feeds. Regardless of the round wire feeding method, the width of the laser round wire welding weld and the fullness of the molten pool are difficult to meet the precision requirements of high-tech fields, especially the wide welds and fullness required for thin plate welding. A linear molten pool is formed by welding with a single round wire feed, and the weld is narrow. If the laser weld is more than 3 times larger than the single round wire feed, the weld will bite, and the thin plate without a welding wire cover is easily penetrated by the laser. The reasons for this problem are complex and comprehensive, and in long-term welding practice and academic research, no attention has been paid to or solutions to related technical problems. In view of this, the present invention is proposed. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present disclosure provides a solution to improve the uniformity of the molten pool of a wide laser weld. After a large number of experiments and verifications, the inventor creatively proposes a method for homogenizing the molten pool of a wide laser weld. Through the use of the present disclosure, the uniformity of the molten pool of a wide laser weld is greatly improved, the welding quality and efficiency are improved, and the problems in the prior art are solved without increasing the cost.

[0004] The present disclosure provides a method for homogenizing a wide weld pool in laser welding, comprising: setting wire feeding parameters that are compatible with both laser welding and welding substrates; selecting a flat welding wire as the welding wire for laser welding; setting a laser beam that is compatible with the flat welding wire; the focusing intersection of the laser beam and the base material forms a molten pool; and according to the set wire feeding parameters, the flat welding wire is simultaneously fed into the molten pool to form a uniform laser welding molten pool.

[0005] According to one aspect of the present disclosure, the wire feeding parameters include: when the wire feeding method is front wire feeding, the wire feeding angle is 25-65 degrees, and the wire feeding speed is 6-30mm / s; or, when the wire feeding method is rear wire feeding, the wire feeding angle is 20-45 degrees, and the wire feeding speed is 4-25mm / s; or, when the wire feeding method is side wire feeding, the wire feeding angle is 35-75 degrees, and the wire feeding speed is 2-15mm / s. According to at least one embodiment of the laser beam of the present disclosure, the laser beam is a flat-top laser beam, the laser wavelength is 990-1050nm, the focal length of the swing laser head is 185-195mm, and the minimum spot diameter is 0.10mm-0.20.

[0006] According to the oscillating laser of at least one embodiment of the present disclosure, the oscillating laser head adopts a circular oscillation mode, the oscillation amplitude is 0.2-0.5 mm, and the oscillation frequency is 44-48 Hz.

[0007] According to the present disclosure, the flat welding wire in the present invention is to meet the basic requirements of welding. The present disclosure is a single or multiple flat welding wires, preferably a single one.

[0008] According to at least one embodiment of the flat welding wire of the present disclosure, a ratio of thickness to width of the flat welding wire is 0.29-0.53.

[0009] According to the flat welding wire feeding method of at least one embodiment of the present disclosure, a single flat wire is fed into a molten pool after being straightened, pushed, and guided through a groove after being fed out of an automatic wire feeder.

[0010] According to at least one embodiment of the present disclosure, a camera is arranged above the molten pool, and the wire feeding parameters are automatically adapted to the laser welding through the camera acquisition signal to achieve homogenization of the molten pool. DETAILED DESCRIPTION

[0011] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods. It is understood that the specific implementation methods described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, in the absence of conflict, the implementation methods and features in the implementation methods in the present disclosure can be combined with each other.

[0012] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0013] If there is no special explanation, in the present invention, "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "the first", "the second", "the third", "the fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0014] If there is no special explanation, the "include" and "comprising" mentioned in the present disclosure may be open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or contained, or may only include or contain the listed components. If there is no special explanation, in the present disclosure, "one or more" or "at least one" refers to any one, any two, or any two or more of the listed items. Among them, "several" refers to any two or any two or more.

[0015] In view of the fact that the width of the laser round wire welding bead and the fullness of the molten pool are difficult to meet the precision requirements of the high-tech field, especially the wide weld bead and fullness required for thin plate welding, single round wire feeding is used to form a linear molten pool with a narrow weld bead. If the laser weld bead is more than 3 times larger than the single round wire feeding, undercutting will occur in the weld, and the thin plate without wire cover will be easily penetrated by the laser.

[0016] An embodiment of the present disclosure proposes a method for homogenizing a wide weld pool in laser welding, comprising: setting wire feeding parameters that are compatible with both laser welding and welding substrates; selecting a flat welding wire as the welding wire for laser welding; setting a laser beam that is compatible with the flat welding wire; the focusing intersection of the laser beam and the base material forms a molten pool; according to the set wire feeding parameters, the flat welding wire is simultaneously fed into the molten pool after exiting an automatic wire feeder, and a short-side reciprocating scanning path is used to form a uniform laser welding molten pool.

[0017] In at least one embodiment, setting parameters that match laser welding includes setting the parameters of the laser welding machine itself, including test conditions, such as the test material is 6056 aluminum alloy or 304 stainless steel plate, and the test plate (substrate, mother plate, parent material, substrate) size is 2000mm×600mm×40mm. The laser used in the test is a fiber laser with a maximum output power of 10 kW. In order to monitor the dynamic behavior of the molten pool in real time during the welding process, the test uses a high-speed camera and an auxiliary light source to monitor the welding molten pool in real time.

[0018] The laser welding speed is 0.1-3.5m / min, the laser power is 1.5-5.5kW, and the shielding gas flow rate is 5-35 L / min. The preferred laser welding speed is 0.8-3.0m / min, the laser power is 2.0-3.5kW, and the shielding gas flow rate is 8-25 L / min. The preferred laser welding speed is 1.5-2.5m / min, the laser power is 2.5-3.5kW, and the shielding gas flow rate is 10-20 L / min. The preferred laser welding speed is 2m / min, the laser power is 2.5kW, and the shielding gas flow rate is 15 L / min.

[0019] The wire feeding speed and wire feeding angle have an important influence on the molten pool. In at least one embodiment of the present disclosure, the wire feeding parameters include: when the wire feeding method is front wire feeding, the wire feeding angle is 25-65 degrees, and the wire feeding speed is 6-30 mm / s; or, when the wire feeding method is rear wire feeding, the wire feeding angle is 20-45 degrees, and the wire feeding speed is 4-25 mm / s; or, when the wire feeding method is side wire feeding, the wire feeding angle is 35-75 degrees, and the wire feeding speed is 2-15 mm / s.

[0020] When the wire feeding mode is front wire feeding, the wire feeding angle is 25-65 degrees, and the wire feeding speed is 6-30mm / s; preferably, the wire feeding angle is 25 degrees, 28 degrees, 30 degrees, 32 degrees, 35 degrees, 38 degrees, 40 degrees, 42 degrees, 45 degrees, 50 degrees, 55 degrees, 59 degrees, 62 degrees, 65 degrees, and the wire feeding speed is 6mm / s, 8mm / s, 10mm / s, 12mm / s, 13mm / s, 15mm / s, 20mm / s, 21mm / s, 22mm / s, 23mm / s, 25mm / s, 26mm / s, 27mm / s, 28mm / s, and 30mm / s.

[0021] When the wire feeding mode is post-wire feeding, the wire feeding angle is 20-45 degrees, and the wire feeding speed is 4-25mm / s; preferably, the wire feeding angle is 20 degrees, 22 degrees, 25 degrees, 28 degrees, 30 degrees, 32 degrees, 33 degrees, 35 degrees, 38 degrees, 40 degrees, 42 degrees, 43 degrees, 44 degrees, 45 degrees, and the wire feeding speed is 4mm / s, 6mm / s, 8mm / s, 10mm / s, 12mm / s, 13mm / s, 15mm / s, 20mm / s, 21mm / s, 22mm / s, 23mm / s, and 25mm / s.

[0022] When the wire feeding method is side wire feeding, the wire feeding angle is 35-75 degrees, and the wire feeding speed is 2-15mm / s; preferably, the wire feeding angle is 35 degrees, 38 degrees, 40 degrees, 42 degrees, 43 degrees, 44 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 68 degrees, 70 degrees, and 75 degrees, and the wire feeding speed is 2mm / s, 4mm / s, 6mm / s, 8mm / s, 10mm / s, 12mm / s, 13mm / s, and 15mm / s.

[0023] In the embodiments of the present disclosure, due to the use of flat welding wire, that is, the laser welding width of the flat welding wire, it is conducive to improving the rapid entry of the flat welding wire molten liquid into the molten pool, especially the wide weld bead and fullness required for thin plate welding. A linear molten pool is formed by welding with a single round wire feeding, and the weld bead is narrow. If the laser weld bead is more than 3 times larger than the single round wire feeding, the welding will appear undercut, and the thin plate without welding wire bottom cover is easily penetrated by the laser welding. The single round wire feeding will form a narrow linear molten pool. It should be noted that since the present disclosure uses a flat welding wire, it is found through scanning with a high-speed camera that in the welding process of the present disclosure, the laser swing width is adapted to the flat welding wire to melt into a wide droplet and merge into the weld bead, not a round wire droplet. The wide droplet of the flat welding wire can quickly enter the surface covering the width of the molten pool, evenly merge into the weld bead of the substrate, and can protect the working condition requirements of the substrate. After welding, the weld bead is full and does not bite. The melting and separation process of the flat welding wire of the laser filler wire welding is more conducive to diffusion into the molten pool. The liquid metal in the molten pool provides more favorable conditions for the incompressible Newtonian fluid, which promotes the formation of laminar flow.

[0024] The laser beam is a flat-top laser beam, the laser wavelength is 990-1050 nm, the focal length of the swing laser head is 185-195 mm, and the minimum spot diameter is 0.10-0.20 mm.

[0025] Since a flat welding wire is used, the laser beam is shaped to fit the flat welding wire. Specifically, a continuous laser generator is used to emit a single-mode continuous Gaussian laser to shape the laser beam, and the continuous Gaussian laser is shaped into a single-mode continuous flat-top laser. Thereafter, an optical element is used to shape the single-mode continuous flat-top laser into a single-mode continuous or pulsed flat-top ring laser. After the molten pool is completely solidified to form a workpiece, the continuous or pulsed flat-top laser beam is turned off, the power of the flat-top laser is adjusted, and the surface of the workpiece is subjected to laser shock peening.

[0026] The laser wavelength is 990-1050nm, preferably 990mm, 1000mm, 1030mm, 1050mm. The focal length of the oscillating laser head is 185-195mm, preferably 185mm, 190mm, 192mm, 193mm, 195mm. The minimum spot diameter is 0.10-0.20mm, preferably 0.10 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.20 mm.

[0027] According to at least one embodiment of the oscillating laser of the present disclosure, the oscillating laser head adopts a circular oscillation mode, the oscillation amplitude is 0.2-0.5 mm, and the oscillation frequency is 44-48 Hz. Preferably, the oscillation amplitude is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm. Preferably, the oscillation frequency is 44 Hz, 45 Hz, 46 Hz, 47 Hz, 48 Hz.

[0028] According to at least one embodiment of the present disclosure, the flat welding wire is designed to meet basic welding requirements, and the flat welding wire is a single wire, two wires, three wires, four wires, etc.

[0029] According to at least one embodiment of the flat welding wire disclosed herein, the principle is to adapt the joint and achieve uniform molten pool. For example, in one case, the width of the flat welding wire used is 1.3-5.2 times the diameter of the single round wire, preferably 1.5 times, 2.8 times, 3.7 times, 4.0 times, 5.1 times. From another level, the ratio of the thickness to the width of the flat welding wire is 0.29-0.53.

[0030] According to the flat welding wire feeding method of at least one embodiment of the present disclosure, the flat welding wire is fed into the molten pool after being straightened, pushed, and guided through a groove after being fed out of the automatic wire feeder.

[0031] According to at least one embodiment of the present disclosure, a camera is arranged above the molten pool, and the wire feeding parameters are automatically adapted to the laser welding through the camera acquisition signal to achieve homogenization of the molten pool.

[0032] For example, after the flat welding wire comes out of the wire reel, a wire feeder is set near the welding gun. The welding wire is first straightened, and then pushed by the wire pusher. The wire feeder feeds the welding wire into the molten pool through the guide groove, and the welding wire is clamped and fed by rollers on the wire feeding channel between the wire reel and the wire feeder. The roller can be a non-powered passive wheel, and the wire feeder and the wire pusher act synchronously. For another example, a camera is set above the molten pool, and the controller controls the actions of the wire drawing machine and the wire pusher according to the signal collected by the camera, so as to achieve synchronization with the laser welding process.

[0033] The present invention improves the welding quality and reduces the deposited layer. The internal part of the joint is dense and has no empty spots. The keyhole is deep, the molten pool is uniform, and the weld width is uniform. At the same time, the use of flat welding wire is conducive to automatic wire feeding by rollers and other methods. In the method disclosed in the present invention, the wire feeding angle range is large and the angle can be selected to be smaller and more inclined, and the wire can be fed in multiple ways such as front, rear, and side.

[0034] The present disclosure may also apply a magnetic field, the intensity of which is parallel to the welding direction, which may further enhance the above effects. Example

[0035] A laser welding molten pool homogenization method is implemented. A 304 stainless steel plate is selected, and the substrate size is 2000mm×600mm×40mm. Before the test, the substrate is polished with sandpaper and then wiped with anhydrous ethanol to remove oxides and oil stains on the surface of the substrate. The laser used in the test is a fiber laser with a maximum output power of 10 kW. A single flat welding wire is selected as the laser welding wire, and the ratio of the thickness to the width of the flat welding wire is 0.41. The front wire feeding angle is set to 28 degrees, and the wire feeding speed is 28mm / s. The laser welding speed is set to 1.5m / min, the laser power is 5.0kW, and the shielding gas flow rate is 15 L / min; the laser beam is set to a flat-top laser beam, the laser wavelength is 1050nm, the focal length of the swing laser head is 195mm, and the minimum spot diameter is 0.10mm; the test uses a high-speed camera and an auxiliary light source to monitor the dynamic behavior of the molten pool during welding in real time; the focusing intersection of the laser beam and the base material forms a molten pool, and at the same time, the flat welding wire is fed into the molten pool after exiting the automatic wire feeder to form a uniform laser welding molten pool. Example

[0036] When the wire feeding mode is post-feeding, the wire feeding angle is 25 degrees and the wire feeding speed is 20 mm / s; the rest is the same as Example 1. Example

[0037] When the wire feeding method is side wire feeding, the wire feeding angle is 50 degrees and the wire feeding speed is 15 mm / s; the rest is the same as Example 1.

[0038] Comparative Example 1 A single round wire is selected for laser welding; the rest is the same as in Example 1.

[0039] Comparative Example 2 A single round wire was selected for laser welding; the front wire feeding angle was set to 70 degrees and the wire feeding speed was set to 38 mm / s; the rest was the same as in Example 1.

[0040] Comparative Example 3 A single round wire was selected for laser welding; and the post-wire feeding angle was set to 55 degrees and the wire feeding speed to 40 mm / s; the rest was the same as in Example 2.

[0041] Comparative Example 4 A single round wire was selected for laser welding; and the side wire feeding angle was set to 25 degrees and the wire feeding speed was 35 mm / s; the rest was the same as in Example 3.

[0042] Comparative Examples 5-8 They correspond to Explanations 1-4 respectively, except that they use double round wire feeding laser welding.

[0043] The welding material prepared in the above embodiment is used to scan the three-dimensional morphology of the deposited layer using an LJ-X8000 line laser measuring instrument to obtain the average width, average height and surface roughness of each deposited layer. The cross-sectional morphology of each deposited layer is observed using an SRL-7045 binocular continuous zoom microscope to measure the corresponding substrate molten pool size and melting depth.

[0044] The molten pools of Examples 1-3 are regular, uniform in structure, and symmetrical. Comparative Examples 1-8 use single round wire or double round wire for welding, and the surface of the joint is rough. The depth of penetration is not much different from that of Examples 1-3, but the molten pools of Comparative Examples 1-8 are irregular and uneven, especially Comparative Example 1-3, which presents gaps or gathering points in some areas.

[0045] Furthermore, since the flow of the molten metal in the molten pool affects the formation of the deposited layer, when the wire feeding method changes, that is, the position of the welding wire fed into the molten pool changes, the flow of the welding wire molten metal in the molten pool is affected, thereby affecting the shape and size of the deposited layer. Specifically, the deposited layers of Examples 1-3 are relatively regular, presenting a circular or elliptical cross-section, while the deposited layers of Comparative Examples 1-8, especially Comparative Example 1-3, present an amorphous cross-sectional structure, such as an "8" shape with one end larger than the other, a protruding diamond-shaped shape, and a number of convex points on the smooth deposited layer.

[0046] The width of the deposited layer of Examples 1-3 is concentrated between 2.5-3.5 mm, while the width of the deposited layer of Comparative Examples 1-8 (if there are scattered points, calculated from the distance between two scattered points of the deposited layer) is respectively: 1.9 mm, 1.2 mm, 2.3 mm, 3.6 mm, 4.7 mm, 5.6 mm, 4.2 mm, 6.6 mm, and the width of the deposited layer of Comparative Examples 1-8 is not statistically significant and is relatively discrete. The height of the deposited layer of Examples 1-3 is concentrated between 1.5-2.8 mm, while the height of the deposited layer of Comparative Examples 1-8 is respectively: 0.7 mm, 1.3 mm, 2.5 mm, 2.6 mm, 3.3 mm, 4.6 mm, 5.8 mm, 5.0 mm, and the height of the deposited layer of Comparative Examples 1-8 is not statistically significant and is relatively discrete.

[0047] In general, the surface roughness of the deposited layer of Examples 1-3 is smaller than that of Comparative Examples 1-8, and the surface of Comparative Examples 1-8 has regional concentration points, and the deposited layer needs to be polished with great difficulty, which increases the processing cost. However, Examples 1-3 basically do not require additional polishing.

[0048] Under the same wire feeding method, in Comparative Examples 2-4, where the wire feeding angle and wire feeding speed are not within the scope of the present disclosure, the substrate melting depth is smaller than that of Examples 1-3; the molten pools of Examples 1-3 are in a flat pear shape with an overall arc shape, while the molten pools of Comparative Examples 2-4 are in a pear shape after being gnawed and are uneven; accompanied by the differences in melting depth and molten pool, the deposited layers of Comparative Examples 2-4 also have problems of being too large or too small or having bumps as described above.

[0049] The technical solution disclosed in the present invention is a method for homogenizing a wide weld pool of laser welding, which sets wire feeding parameters that are compatible with both laser welding and welding substrates, selects a flat welding wire as the welding wire for laser welding, sets a laser beam that is compatible with the flat welding wire, and the focusing intersection of the laser beam and the substrate forms a molten pool; according to the set wire feeding parameters, the flat welding wire is simultaneously fed into the molten pool after exiting an automatic wire feeder to form a uniform laser welding molten pool. Firstly, a high welding speed is guaranteed and welding efficiency is improved. On this basis, the formed molten pool is uniform, presenting a low deposition layer height, a reasonable deposition layer width, and an overall arc-shaped deposition layer. The appearance of the joint is smooth, the metal and the welding wire are integrated, and there are no faults, breakpoints, cracks, or fissures. The wire feeding method that has been verified many times is limited to a reasonable range. When the wire feeding method is front wire feeding, the wire feeding angle is 25-65 degrees, and the wire feeding speed is 6-30mm / s, or when the wire feeding method is rear wire feeding, the wire feeding angle is 20-45 degrees, and the wire feeding speed is 4-25mm / s, or when the wire feeding method is side wire feeding, the wire feeding angle is 35-75 degrees, and the wire feeding speed is 2-15mm / s; beyond this range, as mentioned above, the surface of the deposited layer begins to become rough, the melting depth becomes shallow, and the molten pool becomes irregular and uneven.

[0050] The solution for improving the uniformity of the laser welding molten pool provided by the present disclosure, especially the solution of Examples 1-3, uses flat welding wire instead of round wire welding, the welding bead is wider, and the fullness of the molten pool is higher, which meets the high-precision requirements in the high-tech field, especially the thin plate welding needs. The single flat wire in Examples 1-3 is laser welded to form a wide, flat, regular molten pool without biting and without laser welding through the thin plate without welding wire cover; the uniformity of the molten pool is greatly improved, and the welding efficiency is improved at the same time. Without increasing the cost, the problems in the prior art are solved, and the technical effects that cannot be expected by technicians in the relevant technical field are achieved.

[0051] Although the present disclosure has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; those skilled in the art should understand that without departing from the spirit and scope of the present disclosure, the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure. Therefore, this means that all such replacements and modifications within the scope of the present disclosure are included in the attached claims.

Claims

1. A method for homogenizing a wide weld pool in laser welding, characterized in that: include: Set wire feeding parameters suitable for both laser welding and welding substrate; Choose flat welding wire as welding wire for laser welding; Setting the laser beam to match the flat welding wire; The focused intersection of the laser beam and the substrate forms a molten pool; according to the set wire feeding parameters, the flat welding wire is simultaneously fed into the molten pool to form a uniform laser welding wide weld pool.

2. The method for homogenizing a wide-bead laser welding molten pool according to claim 1, characterized in that: The wire feeding parameters include: When the wire feeding mode is front wire feeding, the wire feeding angle is 25-65 degrees and the wire feeding speed is 6-30mm / s; Alternatively, when the wire feeding method is rear wire feeding, the wire feeding angle is 20-45 degrees, and the wire feeding speed is 4-25 mm / s; or, when the wire feeding method is side wire feeding, the wire feeding angle is 35-75 degrees, and the wire feeding speed is 2-15 mm / s.

3. The method for homogenizing a wide-bead laser welding molten pool according to claim 1, characterized in that: The laser beam adaptation selection is set to a flat-top laser beam, the laser wavelength is 990-1050nm, the focal length of the swing laser head is 185-195mm, and the minimum spot diameter is 0.10-0.20mm.

4. The method for homogenizing a wide-bead laser welding molten pool according to claim 3, characterized in that: The swing laser head is adapted and selected to adopt a circular swing mode, with a swing amplitude of 0.2-0.5 mm and a swing frequency of 44-48 Hz.

5. The method for homogenizing a wide-bead laser welding molten pool according to claim 1, characterized in that: The flat welding wire is a single strip, a double strip, or a plurality of strips, preferably a single strip.

6. The method for homogenizing a wide-bead laser welding molten pool according to any one of claims 1 to 5, characterized in that: The ratio of the thickness to the width of the flat welding wire is selected according to the working conditions and is set to 0.29-0.

53.

7. The method for homogenizing a wide-bead laser welding molten pool according to claim 6, characterized in that: The flat welding wire is sent into the laser welding molten pool after being straightened, pushed and guided by the automatic wire feeder.

8. The method for homogenizing a wide-bead laser welding molten pool according to claim 7, characterized in that: A camera is arranged above the molten pool, and the wire feeding parameters are controlled by collecting signals through the camera to automatically adapt to the laser welding, so as to achieve homogenization of the molten pool.