Process for reducing welding distortion of stainless steel ring

Abstract

The present application relates to the technical field of stainless steel welding, and discloses a process method for reducing welding deformation of stainless steel rings, which comprises the following processing steps: S1, degreasing and cleaning the welding workpiece and drying it to remove impurities and oil stains in the welding area; S2, assembling and pairing on a work platform, uniformly fixing with an argon arc welding machine, and then fixing the two same workpieces back to back, with a C-shaped clamp used for clamping during fixing; S3, placing the two fixed workpieces on a rotary positioner and clamping and fixing them; S4, adjusting the laser welding equipment and parameters and performing laser welding; S5, after welding one side, turning over the workpiece and welding the other piece; and S6, placing the workpiece in a heat treatment furnace after welding, and keeping heat for 4 hours and air cooling. The present application has a reasonable process scheme, a stable welding process, and small deformation after welding after the two stainless steel rings are separated. After removing the machining weld reinforcement, no pores are found, the flatness deformation after welding is 0.5 mm, the roundness deformation is less than 0.02, and the perpendicularity deformation is less than 0.1.

Description

Technical Field

[0001] This invention relates to the field of stainless steel welding technology, and in particular to a process method for reducing welding deformation of stainless steel rings. Background Technology

[0002] Stainless steel is widely used in construction, shipbuilding, chemical, automotive, and food industries due to its excellent corrosion resistance, heat resistance, mechanical properties, and weldability. However, without back-mounting, welding deformation during circumferential seam welding is significant and difficult to correct post-weld. Laser welding, after tack welding, offers advantages over traditional manual arc welding and TIG welding. Laser welding of stainless steel is faster, more efficient, has a larger depth-to-width ratio, a narrower heat-affected zone, less deformation, and better weld quality. It is well-suited for complex structures and high-precision parts. After welding, the weld is placed in a heat treatment furnace to relieve stress and reduce welding deformation.

[0003] Traditional argon arc welding produces significant deformation after welding. Therefore, we propose a process method for reducing welding deformation of stainless steel rings to solve the above problem. Summary of the Invention

[0004] The purpose of this invention is to address the drawback of traditional argon arc welding in the prior art, which results in significant deformation after welding, and to propose a process method for reducing welding deformation of stainless steel rings.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention proposes a process for reducing welding deformation of stainless steel rings, comprising the following processing steps: S1. Degrease, clean, and dry the welded workpiece to remove impurities and oil stains from the welding area; S2. Assemble the workpieces on the work platform and use an argon arc welding machine to evenly spot-fix them. Then spot-fix two identical workpieces back to back, using C-clamps to hold them in place during spot-fixing. S3. Place the two tack-fixed workpieces on the rotary positioner and clamp them in place. S4. Adjust the laser welding equipment and parameters, and then perform laser welding; S5. After welding one side, flip the workpiece over and weld the other part; S6. After welding, place the workpiece in a heat treatment furnace, keep it at the temperature for 4 hours, and then air cool it. S7. After the workpieces have cooled down, separate the two workpieces and measure their flatness after separation. S8. Remove excess weld height and inspect the porosity of the weld surface.

[0006] As a preferred embodiment of the present invention, the workpiece material is 316L stainless steel, and the cover plate thickness is 3mm.

[0007] As a preferred embodiment of the present invention, the workpiece welding joint is a lap joint.

[0008] As a preferred embodiment of the present invention, in step S1, ultrasonic vibration is used to clean the welded workpiece for 15 minutes, and after cleaning, it is dried at 120°C for 1 hour.

[0009] As a preferred embodiment of the present invention, in step S2, when assembling the workpiece on the work platform, the assembly gap is guaranteed to be less than 0.2 mm and the misalignment is less than 0.2 mm.

[0010] As a preferred technical solution of the present invention, in step S2, TIG welding is used for spot fixing with parameters of 60A, nitrogen flow rate of 10L / min, and spot fixing is performed at intervals of 100mm.

[0011] As a preferred embodiment of the present invention, the parameters of the laser welding equipment in S4 are: laser power 2300W, laser tilt angle 0°, defocusing amount +6, welding speed 0.02m / s, and nitrogen flow rate 25L / min.

[0012] As a preferred embodiment of the present invention, the temperature in the heat treatment furnace in S6 is 400℃±10℃.

[0013] The beneficial effects of this invention are: This invention proposes a process method to reduce welding deformation of stainless steel rings. The process scheme is reasonable and the welding process is stable. After separating the two stainless steel rings, the deformation after welding is small. After removing the excess height of the machined weld, no porosity was found. The flatness deformation after welding is 0.5 mm, the roundness deformation is less than 0.02 mm, and the perpendicularity deformation is less than 0.1 mm. Detailed Implementation

[0014] The present invention will be further explained below with reference to specific embodiments, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] A process for reducing welding deformation of stainless steel rings includes the following processing steps: S1. Degrease, clean, and dry the welded workpiece to remove impurities and oil stains from the welding area; S2. Assemble the workpieces on the work platform and use an argon arc welding machine to evenly spot-fix them. Then spot-fix two identical workpieces back to back, using C-clamps to hold them in place during spot-fixing. S3. Place the two tack-fixed workpieces on the rotary positioner and clamp them in place. S4. Adjust the laser welding equipment and parameters, and then perform laser welding; S5. After welding one side, flip the workpiece over and weld the other part; S6. After welding, place the workpiece in a heat treatment furnace, keep it at the temperature for 4 hours, and then air cool it. S7. After the workpieces have cooled down, separate the two workpieces and measure their flatness after separation. S8. Remove excess weld height and inspect the porosity of the weld surface.

[0016] Furthermore, the workpiece material is 316L stainless steel, and the cover plate thickness is 3mm.

[0017] Furthermore, the workpiece welding joint is in the form of an lap joint.

[0018] Furthermore, in step S1, ultrasonic vibration is used to clean the welded workpiece for 15 minutes, and after cleaning, it is dried at 120°C for 1 hour.

[0019] Furthermore, in step S2, when assembling the workpiece on the work platform, the assembly gap is ensured to be less than 0.2 mm and the misalignment is less than 0.2 mm.

[0020] Furthermore, in step S2, TIG welding is used for spot fixing with parameters of 60A, nitrogen flow rate of 10L / min, and spot fixing is performed at 100mm intervals.

[0021] Furthermore, the parameters of the laser welding equipment in S4 are: laser power 2300W, laser tilt angle 0°, defocusing amount +6, welding speed 0.02m / s, and nitrogen flow rate 25L / min.

[0022] Furthermore, the temperature in the heat treatment furnace in S6 is 400℃±10℃.

[0023] In this embodiment, the present invention proposes a process method for reducing welding deformation of stainless steel rings. The process scheme is reasonable, the welding process is stable, and after separating the two stainless steel rings, the deformation after welding is small. After removing the excess height of the machined weld, no porosity was found. The flatness deformation after welding is 0.5mm, the roundness deformation is less than 0.02, and the perpendicularity deformation is less than 0.1.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A process for reducing welding deformation of stainless steel rings, characterized in that, The processing steps include the following: S1. Degrease, clean, and dry the welded workpiece to remove impurities and oil stains from the welding area; S2. Assemble the workpieces on the work platform and use an argon arc welding machine to evenly spot-fix them. Then spot-fix two identical workpieces back to back, using C-clamps to hold them in place during spot-fixing. S3. Place the two tack-fixed workpieces on the rotary positioner and clamp them in place. S4. Adjust the laser welding equipment and parameters, and then perform laser welding; S5. After welding one side, flip the workpiece over and weld the other part; S6. After welding, place the workpiece in a heat treatment furnace, keep it at the temperature for 4 hours, and then air cool it. S7. After the workpieces have cooled down, separate the two workpieces and measure their flatness after separation. S8. Remove excess weld height and inspect the porosity of the weld surface. The workpiece material is 316L stainless steel, and the cover plate thickness is 3mm. The welding joint of the workpiece is a lap joint; In step S1, ultrasonic vibration is used to clean the welded workpiece for 15 minutes, and after cleaning, it is dried at 120°C for 1 hour. In step S2, when assembling the workpiece on the work platform, ensure that the assembly gap is less than 0.2mm and the misalignment is less than 0.2mm. In S2, TIG welding is used for tack bonding with parameters of 60A, nitrogen flow rate of 10L / min, and tack bonding is performed at 100mm intervals. The parameters of the laser welding equipment in S4 are: laser power 2300W, laser tilt angle 0°, welding speed 0.02m / s, and nitrogen flow rate 25L / min. The temperature in the heat treatment furnace in S6 is 400℃±10℃.