A continuous welding process

Abstract

The present invention belongs to the field of welding technology, and specifically relates to a continuous welding process, comprising the following steps: S1. Completely fit the surface to be welded of a first workpiece to a second workpiece, and press the first workpiece to the second workpiece; S2. Perform pulse continuous welding on the fitting surfaces of the first workpiece and the second workpiece, and perform wire feeding compensation during the welding process. The purpose is to not only avoid inconsistent weld widths when welding irregular workpieces, but also make the welds on the surface of the welded workpieces consistent, achieve seamless welding, reduce the difficulty of operation, and improve welding efficiency and quality.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a continuous welding process. Background Art

[0002] In modern industrial manufacturing, the manufacture of irregular conical structures often faces the challenges of difficult welding and high quality requirements. Traditional welding technology is difficult to achieve the required accuracy and strength while ensuring efficiency. Conventional irregular cone welding is done manually, which requires high operating skills of personnel and is very likely to cause product failure during production. In addition, traditional irregular pulse welding is laser spot welding. During the welding process, high temperature is generated on the surface, the weld comes into contact with oxygen ions in the air, an oxide layer is formed on the surface, the weld surface turns yellow and black, and the large gap between the weld spot products causes incomplete welds, affecting the aesthetics of welding. Summary of the invention

[0003] The purpose of the present invention is to provide a continuous welding process, which can not only avoid inconsistent weld width when welding irregular workpieces, but also make the welds on the surface of the welded workpieces consistent, achieve seamless welding, reduce operating difficulty, and improve welding efficiency and quality.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A continuous welding process comprises the following steps:

[0006] S1. Completely fit the surface of the first workpiece to be welded onto the second workpiece, and press the first workpiece onto the second workpiece;

[0007] S2. Pulse continuous welding is performed on the mating surfaces of the first workpiece and the second workpiece, and wire feeding compensation is performed during the welding process.

[0008] According to the above technical means, by completely fitting the surface to be welded to another workpiece, it is beneficial to improve the welding accuracy, and then through pulse continuous welding and wire feeding compensation, the welds of the fitting surfaces of the first workpiece and the second workpiece can be made consistent and complete, thereby improving the welding quality.

[0009] Preferably, in the step S1, before the surfaces to be welded of the first workpiece are completely fitted together, the surfaces to be welded of the first workpiece are cut into an adapted shape according to the shape of the second workpiece.

[0010] According to the above technical means, by adjusting the shape of the first workpiece according to the different shapes of the second workpiece, it is possible to adapt to the welding of different first workpieces.

[0011] Preferably, in the step S1, when the first workpiece is pressed against the second workpiece, the pressure is 500-1020 Pa.

[0012] More preferably, the pressure is 700-900Pa.

[0013] According to the above technical means, by controlling the pressure between the first workpiece and the second workpiece, damage to the second workpiece can be avoided, and at the same time, it is also beneficial to reduce the unevenness of the weld.

[0014] Preferably, in the step S2, when pulse continuous welding is performed, the pulse width is 0.1-2 mm, the current is 220-280 A, and the voltage is 1-200 V.

[0015] Further preferably, the pulse width is 0.5-1.2 mm, the current is 240-260 A, and the voltage is 120-135 V.

[0016] Further preferably, during pulse continuous welding, the laser spotting speed is 1-100 dots / s.

[0017] According to the above technical means, by controlling the pulse width and laser spotting speed, the energy spot can be made consistent to ensure the width of the weld. By controlling the current and voltage intensity, the energy balance during welding can be guaranteed to avoid high and low differences that would cause inconsistent weld width.

[0018] Preferably, in step S2, when pulse continuous welding is performed, the first workpiece is rotated driven by the second workpiece.

[0019] Further preferably, the rotation speed of the first workpiece is 4-7 mm / s.

[0020] According to the above technical means, the second workpiece is driven to rotate by the first workpiece so that the welding gun can perform follow-up welding, which can improve the stability of the welding gun and ensure the integrity of the weld as much as possible.

[0021] Further preferably, in the step S2, during the welding process, the movement of the welding gun follows the rotation of the first workpiece to perform telescopic movement.

[0022] Further preferably, the amplitude of the telescopic movement is 2-12 mm.

[0023] According to the above technical means, by controlling the telescopic movement and the amplitude of the telescopic movement of the welding gun during the welding process, it is possible to adapt to the welding surface of the first workpiece of different shapes and the fitting conditions with the surface of the second workpiece, thereby facilitating seamless welding.

[0024] Preferably, in the step S2, when performing wire feeding compensation, the wire feeding speed is 4-6 mm / s.

[0025] Further preferably, during wire feeding compensation, the diameter of the welding wire is 0.2-1 mm.

[0026] According to the above technical means, by controlling the wire feeding speed and the diameter of the welding wire to adapt to the rotation speed of the workpiece, the weld can be made more complete and consistent during welding, which is conducive to the formation of seamless fusion.

[0027] Preferably, in the step S2, a shielding gas is blown during the welding process, the flow rate of the shielding gas is 25-40 ml / s, and the blowing angle is 30-55°.

[0028] According to the above technical means, by using protective gas blowing and controlling the gas flow and gas angle, a vacuum layer can be formed at the welding site, which can avoid the formation of a surface oxide layer during the welding process, so that the welding site is more beautiful.

[0029] More preferably, the protective gas is one or more combinations of carbon dioxide, nitrogen, helium and argon.

[0030] Preferably, the method further includes the following steps: after welding, performing a solid solution treatment on the welding part, and during the solid solution treatment, using a foamy solvent spray to cover the welding part.

[0031] Further preferably, the foamy solvent comprises the following raw materials in parts by weight: 2-5 parts of sodium carbonate, 3-5 parts of disodium EDTA, 1-2 parts of polyethylene glycol, 1-4 parts of dodecyltrimethylammonium chloride, 0.5-1.2 parts of citric acid, 0.2-0.5 parts of acidic sulfate sodium salt and 1-3 parts of methyl isobutyl carbinol.

[0032] According to the above technical means, by forming a foam-like covering on the welding part, the welding part can be subjected to solid solution treatment, and the burrs and corners formed during the welding process can be removed, which can not only make the welding part smoother, but also form a protective film on the surface to reduce the impact of continuous welding of the first workpiece on the second workpiece. In addition, the foam-like solvent is not easy to flow and will not affect the rest of the workpiece.

[0033] By using sodium carbonate, stains, dust, etc. generated during the welding process can be removed, while citric acid can effectively corrode burrs and corners on the welding surface. The addition of polyethylene glycol can make disodium EDTA as a chelating agent and dodecyltrimethylammonium chloride as a corrosion inhibitor more evenly distributed, making the welding surface smoother and brighter, and forming a protective film. Acidic sodium sulfate can not only act as a foaming agent, but also has a certain chelating effect. When combined with methyl isobutyl carbinol as a foaming agent, it can form a rich and more stable foam, thereby achieving the formation of a protective film when deburring and removing corners, reducing subsequent deburring operations and maintenance, and reducing the impact of continuous welding of the first workpiece on the second workpiece on the welding surface of the first workpiece.

[0034] Further preferably, the foamy solvent is prepared as follows: sodium carbonate and disodium EDTA are dissolved in water, citric acid, polyethylene glycol and dodecyltrimethylammonium chloride are added, stirred evenly, and then acidic sodium sulfate and methyl isobutyl carbinol are added, stirred evenly, and allowed to stand to obtain a foamy solvent.

[0035] According to the above technical means, the preparation can be obtained by directly adding, stirring and mixing, the process is simple, and it is convenient for large-scale production and use.

[0036] The present application using the above technical solution has the following advantages:

[0037] 1. In the present application, by cutting the surface to be welded of the first workpiece into different shapes according to the surface of the second workpiece, it can adapt to the welding of different types of workpieces and help reduce the inconsistency of the width of the weld. Then, by performing pulse continuous welding and performing wire feeding compensation during the welding process, the welds on the surfaces of the welded workpieces can be made consistent and seamless welding can be achieved, thereby reducing the difficulty of manual operation and improving welding efficiency and quality.

[0038] 2. In the present application, by controlling the first workpiece to drive the second workpiece to rotate, the welding gun can perform follow-up welding, which can improve the stability of the welding gun, thereby ensuring the integrity of the weld as much as possible. In this process, by controlling the telescopic movement of the welding gun and the amplitude of the telescopic movement, it can adapt to the welding surface of the first workpiece of different shapes and the fitting conditions with the surface of the second workpiece, thereby improving versatility;

[0039] 3. In the present application, by blowing protective gas during welding and controlling the gas flow and gas angle, a vacuum layer can be formed at the welding site, which can avoid the formation of a surface oxide layer during welding, so as to make the welding site more beautiful;

[0040] 4. In the present application, after welding, by covering the welding part with a foamy solvent, the welding part can be subjected to a solid solution treatment, and the burrs and corners formed during the welding process can be removed, which can not only make the welding part smoother, but also form a protective film on the surface to reduce the impact of continuous welding of the first workpiece on the second workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0042] Figure 1 This is a flow chart of the continuous welding process in the embodiment of the present application; DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In the embodiment of the present application, when continuous welding is performed, the process operation is as follows: Figure 1 As shown, an irregular conical structure is used as the first workpiece, a stainless steel conical barrel is used as the second workpiece, and a plurality of first workpieces are evenly distributed and welded on the second workpiece.

[0045] Example 1, continuous welding process 1

[0046] Preparation of foamy solvent

[0047] 2 parts by weight of sodium carbonate and 5 parts by weight of disodium EDTA are dissolved in water, 0.5 parts by weight of citric acid, 1 part by weight of polyethylene glycol and 4 parts by weight of dodecyltrimethylammonium chloride are added, and the mixture is stirred evenly. Then 0.5 parts by weight of sodium salt of acidic sulfate ester and 1 part by weight of methyl isobutyl carbinol are added, the mixture is stirred evenly, and the mixture is allowed to stand to obtain a foamy solvent.

[0048] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 700Pa;

[0049] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0050] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 4 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 4 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 35 / s;

[0051] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 4 mm / s, and the diameter of the welding wire is 0.3 mm;

[0052] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0053] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas is 32 ml / s, and the blowing angle is 45°;

[0054] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0055] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0056] Example 2, continuous welding process 2

[0057] In this embodiment, the foamy solvent used is the same as that in Embodiment 1.

[0058] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 800Pa;

[0059] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0060] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 5 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 5 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 60 / s;

[0061] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 5 mm / s, and the diameter of the welding wire is 0.3 mm;

[0062] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0063] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0064] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0065] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0066] Example 3, continuous welding process three

[0067] In this embodiment, the foamy solvent used is the same as that in Embodiment 1.

[0068] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 900Pa;

[0069] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0070] S21. During the continuous welding process, the first workpiece is driven to rotate by the rotating device at a speed of 7 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 7 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 100 / s;

[0071] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surface of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 7 mm / s, and the diameter of the welding wire is 0.3 mm;

[0072] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0073] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0074] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0075] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0076] Embodiment 4, continuous welding process 4

[0077] Preparation of foamy solvent

[0078] 4 parts by weight of sodium carbonate and 3 parts by weight of disodium EDTA are dissolved in water, 0.85 parts by weight of citric acid, 2 parts by weight of polyethylene glycol and 3 parts by weight of dodecyltrimethylammonium chloride are added, and the mixture is stirred evenly. Then 0.3 parts by weight of sodium salt of acidic sulfate and 2 parts by weight of methyl isobutyl carbinol are added, the mixture is stirred evenly, and the mixture is allowed to stand to obtain a foamy solvent.

[0079] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 700Pa;

[0080] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0081] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 4 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 4 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 35 / s;

[0082] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 4 mm / s, and the diameter of the welding wire is 0.3 mm;

[0083] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0084] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas is 32 ml / s, and the blowing angle is 45°;

[0085] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0086] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0087] Example 5, continuous welding process five

[0088] In this embodiment, the foamy solvent used is the same as that in Embodiment 4.

[0089] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 800Pa;

[0090] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0091] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 5 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 5 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 60 / s;

[0092] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 5 mm / s, and the diameter of the welding wire is 0.3 mm;

[0093] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0094] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0095] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0096] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0097] Example 6, continuous welding process 6

[0098] In this embodiment, the foamy solvent used is the same as that in Embodiment 4.

[0099] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 900Pa;

[0100] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0101] S21. During the continuous welding process, the first workpiece is driven to rotate by the rotating device at a speed of 7 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 7 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 100 / s;

[0102] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surface of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 7 mm / s, and the diameter of the welding wire is 0.3 mm;

[0103] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0104] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0105] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0106] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0107] Embodiment 7, continuous welding process seven

[0108] Preparation of foamy solvent

[0109] Dissolve 5 parts by weight of sodium carbonate and 3 parts by weight of disodium EDTA in water, add 1.2 parts by weight of citric acid, 1 part by weight of polyethylene glycol and 4 parts by weight of dodecyltrimethylammonium chloride, stir evenly, then add 0.5 parts by weight of acidic sulfate sodium salt and 3 parts by weight of methyl isobutyl carbinol, stir evenly, and let stand to obtain a foamy solvent.

[0110] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 700Pa;

[0111] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0112] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 4 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 4 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 35 / s;

[0113] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 4 mm / s, and the diameter of the welding wire is 0.3 mm;

[0114] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0115] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas is 32 ml / s, and the blowing angle is 45°;

[0116] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0117] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0118] Embodiment 8, continuous welding process eight

[0119] In this embodiment, the foamy solvent used is the same as that in Example 7.

[0120] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 800Pa;

[0121] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0122] S21. During continuous welding, the first workpiece is driven to rotate by a rotating device at a speed of 5 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 5 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 60 / s;

[0123] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surfaces of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 5 mm / s, and the diameter of the welding wire is 0.3 mm;

[0124] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0125] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0126] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0127] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0128] Embodiment 9, continuous welding process nine

[0129] In this embodiment, the foamy solvent used is the same as that in Example 7.

[0130] S1. According to the shape of the second workpiece, the surface to be welded of the first workpiece is cut into an inwardly concave arc surface, the surface to be welded of the first workpiece is completely attached to the second workpiece, and the first workpiece is pressed against the outer surface of the second workpiece by a lifting device, and the pressure between the first workpiece and the second workpiece is controlled to be 900Pa;

[0131] S2. performing pulse continuous welding on the mating surfaces of the first workpiece and the second workpiece, and performing wire feeding compensation during the welding process;

[0132] S21. During the continuous welding process, the first workpiece is driven to rotate by the rotating device at a speed of 7 mm / s, driving the second workpiece to rotate with the first workpiece at a speed of 7 mm / s. During the rotation process, the laser pulse welding gun welds the fitting surfaces of the first workpiece and the second workpiece. During continuous welding, the pulse width is 0.5 mm, the current is 259±1A, the voltage is 135V, and the laser dot speed is 100 / s;

[0133] S22. During the rotation of the second workpiece with the first workpiece, the welding wire is fed to the welding surface of the first workpiece and the second workpiece by the wire feeding mechanism, the wire feeding speed is 7 mm / s, and the diameter of the welding wire is 0.3 mm;

[0134] S22. During the rotation of the second workpiece with the first workpiece, the welding gun performs telescopic movement with a telescopic range of 2-12mm to adapt to welding surfaces of different shapes;

[0135] S23. During the welding process, carbon dioxide gas is blown, the flow rate of the shielding gas blow is 40ml / s, and the blowing angle is 42°;

[0136] S3. After the first workpiece is welded, a foamy solvent is sprayed on the welding surface through a spraying device, with a spraying thickness of 2-5 mm and a holding time of 60-120 seconds.

[0137] S4. After the first workpiece is completely welded to the second workpiece, two or more first workpieces are uniformly welded to the second workpiece as required to obtain a welded product.

[0138] Embodiment 10, continuous welding process ten

[0139] In this embodiment, no foam solvent is used, the laser spotting speed is 20 per second, and the continuous welding process is the same as that in Embodiment 2.

[0140] Embodiment 11, continuous welding process 11

[0141] In this embodiment, no foamy solvent is used, no wire feeding compensation is used, and the remaining processes are the same as those in Embodiment 2.

[0142] Embodiment 12, continuous welding process twelve

[0143] In this embodiment, no foam solvent is used, the wire feeding mechanism is used to feed the wire, and no protective gas blowing is performed. The remaining processes are the same as those in Embodiment 2.

[0144] The products welded in Examples 1-9 were tested, and appearance inspection, X-ray inspection, tensile test and welding process assessment were used during the test; wherein, appearance inspection was conducted according to GB / T 10045-2001. X-ray inspection was conducted using an X-ray flaw detector, which was divided into level one, level two and level three flaw detection, wherein level one defect tolerance: 1 point of circular defect with a maximum length of ≤1 mm was allowed; level two defect tolerance: 3 circular defects were allowed, and surface pores, slag inclusions, arc pits, cracks, arc scratches and other defects were not allowed; level three defect tolerance: 6 circular defects were allowed (within an area of ​​10 mm long and 10 mm wide, and the thickness of the test piece was less than or equal to 10 mm), and there were no cracks, peeling and other defects on the weld surface, no excess material in the product cavity, and no assembly defects. The tensile test was conducted according to the national standard GB / T 2651-2008 "Welded joint tensile test method", expressed as tensile strength Rm, tested 3 times and the average value was taken; the welding process was evaluated according to AWSD1.1 standard; the test results are shown in Table 1 below:

[0145] Table 1 Welding test results of irregular first workpiece on stainless steel conical barrel

[0146]

[0147] According to the results in Table 1, in Examples 1-3, by controlling the pressure of the first workpiece and the second workpiece, controlling the pulse width, controlling the current and voltage intensity, controlling the laser dot speed, controlling the wire feeding speed, and controlling the flow rate and angle of the shielding gas, a uniform and smooth weld surface without obvious burrs, pores, and cracks can be obtained, indicating that by controlling the above conditions, a weld with consistent width and uniform weld can be obtained, achieving a seamless welding effect, and having good welding quality, which can effectively improve the welding efficiency compared with manual welding.

[0148] In Examples 4-6 and 7-9, the difference from Examples 1-3 is that the amount of raw materials used in the foamy solvent is different. The different amounts of raw materials used in the foamy solvent do not affect the tensile strength / Rm of the weld surface and the X-ray detection results; for the welding process, it does not affect the early welding process, but affects the welding appearance after welding is completed.

[0149] In Examples 1-3, by using pressure and laser dot speed as variables, it is found that the effect on the appearance of the weld surface, X-ray detection and welding process evaluation is not obvious, but it has an effect on the tensile strength. At 700Pa to 800Pa, the tensile strength increases, and with wire feeding compensation, the tensile strength can be significantly improved, while at 800Pa to 900Pa, with wire feeding compensation, the tensile strength is relatively reduced; and when the laser dot speed is increased from 35 / s to 60 / s, the tensile strength is improved, and when it is increased from 60 / s to 100 / s. The tensile strength is reduced, indicating that the laser dot speed is too fast, resulting in the possibility of partial incomplete penetration or partial cold welding. Therefore, controlling reasonable pressure and laser dot speed can significantly improve the welding quality.

[0150] In Example 10, burrs exist on the edge of the weld surface by not using a foamy solvent to treat the weld surface, indicating that the use of a foamy solvent can effectively remove the burrs on the weld surface; and the laser spotting speed is lower than that in Example 1. When the other process parameters are the same, the tensile strength is significantly reduced, and the deposition efficiency in the welding process is also reduced, indicating that the laser spotting speed not only affects the tensile strength, but also affects the deposition efficiency, thereby affecting the overall welding quality.

[0151] In Example 11, by adopting the same laser dot speed as that in Example 2, but without using wire feeding compensation and foamy solvent, not only are burrs present on the weld surface, but cracks also exist on the left and right edges of the first workpiece, indicating that there is a welding quality problem here, that is, wire feeding compensation can be used to effectively compensate for the irregular welding at the weld edge of the irregular weld surface, and can also improve the deposition efficiency.

[0152] In Example 12, by not using wire feeding compensation, foamy solvent and shielding gas, there are not only burrs and color changes in appearance, but also cracks, and the tensile strength is significantly reduced. Compared with Example 11, it is shown that the shielding gas can not only improve the color of the welding surface and avoid color changes, but also can improve the reaction quality in the molten pool due to the oxygen isolation area formed, thereby improving the deposition efficiency and welding quality.

[0153] Therefore, by controlling pressure, pulse width, current and voltage intensity, laser dot speed, wire feeding speed, and flow and angle of shielding gas, it is possible to avoid inconsistent weld widths, make the welds on the surface of the workpiece consistent, achieve seamless welding, reduce operating difficulty, and improve welding efficiency and quality.

[0154] The above is a detailed introduction to a continuous welding process provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A continuous welding process, characterized in that: The following steps are involved: S1. Completely fit the surface of the first workpiece to be welded onto the second workpiece, and press the first workpiece onto the second workpiece; S2. Pulse continuous welding is performed on the mating surfaces of the first workpiece and the second workpiece, and wire feeding compensation is performed during the welding process.

2. The continuous welding process according to claim 1, characterized in that: In the step S1, before the surfaces to be welded of the first workpiece are completely attached, the surfaces to be welded of the first workpiece are cut into an adapted shape according to the shape of the second workpiece.

3. The continuous welding process according to claim 1, characterized in that: In the step S1, when the first workpiece is pressed against the second workpiece, the pressure is 500-1020Pa.

4. The continuous welding process according to claim 1, characterized in that: In the step S2, when pulse continuous welding is performed, the pulse width is 0.1-2 mm, the current is 220-280 A, and the voltage is 1-200 V.

5. The continuous welding process according to claim 1, characterized in that: In the step S2, during pulse continuous welding, the first workpiece is rotated driven by the second workpiece.

6. The continuous welding process according to claim 1, characterized in that: In the step S2, during the welding process, the welding gun moves telescopically following the rotation of the first workpiece.

7. The continuous welding process according to claim 1, characterized in that: In the step S2, when performing wire feeding compensation, the diameter of the welding wire is 0.2-1 mm, and the wire feeding speed is 4-6 mm / s.

8. The continuous welding process according to claim 1, characterized in that: In the step S2, a shielding gas is blown during the welding process, the flow rate of the shielding gas is 25-40 ml / s, and the blowing angle is 30-55°.

9. The continuous welding process according to claim 1, characterized in that: The method also includes the following steps: after welding, performing a solid solution treatment on the welding part, and during the solid solution treatment, using a foamy solvent spray to cover the welding part.

10. The continuous welding process according to claim 9, characterized in that: The foam solvent comprises the following raw materials in parts by weight: 2-5 parts of sodium carbonate, 3-5 parts of disodium EDTA, 1-2 parts of polyethylene glycol, 1-4 parts of dodecyltrimethylammonium chloride, 0.5-1.2 parts of citric acid, 0.2-0.5 parts of acidic sulfate sodium salt and 1-3 parts of methyl isobutyl carbinol.

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