A stainless steel ton drum forming process

Abstract

This invention relates to a forming process for stainless steel ton containers. The process includes: forming a cylindrical body; laser-cutting holes in the lower end cap using a laser cutting machine; riveting and spot-welding the lower end cap to the body; welding a drain pipe to the drain hole; laser-cutting holes in the lower end cap again; welding an open flange to the flange mounting hole; installing a bottom pipe at the open flange; welding an inlet pipe to the gas phase hole; welding a spray pipe to the spray mounting hole; welding a safety valve conversion connector to the valve mounting hole; welding a monitoring device docking flange to the monitoring hole; riveting and spot-welding the upper end cap to the body; welding an arc-shaped protective plate to the perimeter of the body; welding support legs to the arc-shaped protective plate; performing surface treatment to obtain the formed ton container; and conducting a sealing test and surface quality inspection on the formed ton container before warehousing. This invention improves production efficiency, reduces manufacturing costs, and ensures the quality and safety of the ton containers.

Description

Technical Field

[0001] This invention relates to the field of ton container manufacturing technology, and in particular to a stainless steel ton container forming process. Background Technology

[0002] IBCs are essential tools for modern warehousing and transporting liquid products. Traditional IBC manufacturing often involves multiple steps, including cutting, bending, and welding, making the entire process relatively complex and potentially problematic in terms of quality and efficiency. For example, during welding, defects such as discontinuous welds, incomplete welds, and breakdowns may occur, negatively impacting the quality and safety of the IBCs. Furthermore, existing technologies have shortcomings in their processes, such as insufficient quality inspection of the outer and inner surfaces, which may lead to hidden quality issues in the produced IBCs. Summary of the Invention

[0003] Therefore, this invention provides a stainless steel ton barrel forming process, which improves production efficiency, reduces manufacturing costs, and ensures the quality and safety of the ton barrel by simplifying procedures, optimizing welding processes, and conducting comprehensive quality inspections.

[0004] To solve the above technical problems, the present invention provides a stainless steel ton-shaped drum forming process, comprising:

[0005] A rectangular stainless steel plate is provided. After the rectangular stainless steel plate is formed into a circular cylinder, the two ends are welded together to form a barrel body.

[0006] A lower end cap with an ellipsoidal surface is provided, and a laser cutting machine is used to laser-cut holes in the lower end cap to form a drain hole;

[0007] After riveting the circumferential opening of the lower end cap to the circumferential opening of the barrel body, spot weld them together, and then weld the drain pipe to the drain hole.

[0008] An upper end cap with an ellipsoidal surface is provided, and a lower end cap is laser-cut using a laser cutting machine to form flange mounting holes, gas phase holes, spray mounting holes, safety valve mounting holes, and monitoring holes;

[0009] Weld an open flange to the flange mounting hole, install a bottom pipe at the open flange, weld an inlet pipe to the gas phase hole, weld a spray pipe to the spray mounting hole, weld a safety valve conversion connector to the valve mounting hole, and weld a monitoring device docking flange to the monitoring hole.

[0010] The opening periphery of the upper end cap is riveted to the opening periphery of the barrel body and then spot welded.

[0011] Multiple arc-shaped protective plates are welded to the periphery of the barrel body, and the support legs are welded to the arc-shaped protective plates to form the ton barrel body;

[0012] The weld seams of the welded parts of the ton barrel body are subjected to surface treatment to obtain a shaped ton barrel;

[0013] The molded ton containers were subjected to sealing tests and surface quality inspections before being stored.

[0014] In one embodiment of the present invention, a rectangular stainless steel plate is provided. After the rectangular stainless steel plate is formed into a circular cylinder, the two ends are welded together to form a barrel body, comprising:

[0015] The rectangular stainless steel plate is polished on both sides and then covered with a protective film on both sides. The plate surface is free of pits and the diagonal error is less than or equal to 2mm.

[0016] The rectangular stainless steel plate is rolled into a cylindrical shape using a universal rolling mill. Both ends are then argon arc welded using a 1.2mm diameter stainless steel welding wire. The argon arc welding current is 120-140A. Argon gas is supplied for 2 seconds before welding begins and for another 3 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. During welding, argon gas is supplied for protection on the back side of the welding area, allowing for single-sided welding and double-sided forming.

[0017] In one embodiment of the present invention, riveting and spot welding the opening periphery of the lower end cap to the lower opening periphery of the barrel body, and riveting and spot welding the opening periphery of the upper end cap to the upper opening periphery of the barrel body, both include:

[0018] The ellipticity of the lower end cap and the upper end cap is within ±3mm. When riveting, the riveting error is controlled to be less than or equal to 0.5mm. Argon arc welding is performed using an argon arc welding machine with an argon arc welding current of 100~120A.

[0019] Argon arc welding of the lower circumferential weld was performed using a laser welding machine. The weld width was 8.5±1.5mm and the weld height was 1.5±0.5mm. 1.2mm diameter stainless steel welding wire was used. The current was 110~130A. Argon gas was supplied for 1 second before welding started and for another 1 second after welding ended. The argon gas flow rate was 0.05-0.1MPa. During the welding process, argon gas was supplied for protection on the back side of the welding area. Single-sided welding resulted in double-sided forming.

[0020] In one embodiment of the present invention, an open flange is welded onto the flange mounting hole, comprising:

[0021] Argon arc welding is performed using an argon arc welding machine with 1.2mm diameter stainless steel welding wire; the argon arc welding current is 120~140A; argon gas is supplied for 2 seconds before welding begins; and argon gas is supplied for 3 seconds after welding ends.

[0022] Laser welding of the outer surface is performed using a laser welding machine with an argon gas flow rate of 0.05-0.1 MPa and a current of 400-450 A.

[0023] In one embodiment of the present invention, the sewage pipe is welded to the sewage outlet, the air inlet pipe is welded to the gas phase outlet, the spray pipe is welded to the spray mounting hole, the safety valve conversion connector is welded to the valve mounting hole, and the monitoring device docking flange is welded to the monitoring hole, all comprising:

[0024] Double-sided argon arc welding is used, with a current of 80~100A. Argon gas is supplied for 2 seconds before welding begins and for another 2 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa.

[0025] In one embodiment of the present invention, the flange mounting hole is located in the middle of the upper end cap, the lower end face of the drain pipe is 1-2 mm lower than the hole surface of the drain hole, and the inner surface weld joint shall not be higher than the hole surface of the drain hole.

[0026] In one embodiment of the present invention, multiple arc-shaped protective plates are welded to the periphery of the barrel body, and the support legs are welded to the arc-shaped protective plates, including:

[0027] When welding the arc-shaped protective plate, laser welding is used to fully weld the three sides of the arc-shaped protective plate, leaving a section unwelded in the middle of the bottom edge. 1.2mm diameter stainless steel welding wire is used, and the current is 400-450A.

[0028] When welding the support legs, laser welding is used with 1.2mm diameter stainless steel welding wire and a current of 400-450A.

[0029] In one embodiment of the present invention, surface treatment is performed on the weld seams of the welded parts of the ton body, including:

[0030] For the fillet welds of each pipe fitting, polish them with a cloth wheel or fiber wheel, and then polish them with a welding treatment agent.

[0031] The oxide layer on the inner surface of each fitting, except for the conversion joint fitting, is polished using a 240-mesh fiber wheel. The fine holes of the conversion joint fitting are mechanically polished using sandpaper.

[0032] The inner and outer surfaces of the upper and lower circumferential welds formed by the upper and lower end caps and the barrel body are polished with a 304 stainless steel pneumatic wire brush to remove surface black scale, weld beads and slag.

[0033] In one embodiment of the present invention, the sealing test includes: an airtightness test, a water-filling test, and a hydraulic test; wherein:

[0034] The airtightness test is applicable to all tonnes containing liquids, serving as a design model test. Before the test, tonnes must be randomly selected for commissioning and sealing. During the test, the tank is placed on a stable platform or frame, and a ball valve is installed at the gas phase port. Other vents of the tonne are either non-ventilated or blocked. After opening the ball valve at the gas phase port, compressed air is introduced. When the pressure gauge shows a pressure of 0.1 MPa, the ball valve is closed, and pressure is maintained for 10 minutes. Leakage checks are performed on all welded parts using a leak test. If leaks are found, they are repaired and the leak test is repeated. A pass / fail test requires no leakage.

[0035] The water-filling test is also applicable to all ton containers filled with liquids, as a design model test. Before the test, connect the water pipe and water valve to the open flange of the ton container and record the initial value of the water meter. Open the water valve and fill the container with tap water until it overflows at the open flange. Then immediately close the water valve and record the final value of the water meter. Observe whether there is any leakage at each welded part. The test time is 1 hour. If leakage is found, repair it and retest for leakage. The qualification requirement is no leakage.

[0036] The hydraulic test is also applicable to all tonnes filled with liquids, serving as a design model test. During the test, connect the water pipe and valve to the open flange of the tonne container and record the initial reading on the water meter. Pour in tap water until it overflows from the open flange, then close the water valve. The test liquid temperature should not be lower than 5°C. Reopen the inlet valve and flush until the pressure gauge reads 0.1 MPa. Close the water valve and time for 30 minutes. Record the final reading on the water meter and check all welded joints for leaks. If leaks are found, repair them and retest for leaks. The pass / fail criterion is no leakage.

[0037] In one embodiment of the present invention, the surface quality inspection before warehousing includes:

[0038] The inspection of the outer surface includes: measuring the outer dimensions of the ton container to ensure that the dimensions of the ton container meet the specified standards; using a go / no-go gauge to inspect the threads at the bottom pipe, the air inlet pipe, and the drain pipe; inspecting all welds on the outer surface to ensure that the welding is continuous and there are no defects such as missed welds or penetrations; and checking whether it meets the relevant accessory installation requirements for loading.

[0039] Inspection of the inner surface includes: checking for scratches, ensuring the surface is smooth and free of obvious defects; inspecting the welds on the inner surface to confirm the continuity of the weld formation and to check whether the welds have been polished; performing electrolytic polishing on the inner surface and ensuring that there are no defects such as watermarks on the polished surface.

[0040] The technical solution of the present invention has the following advantages compared with the prior art:

[0041] The stainless steel tonne container forming process described in this invention simplifies traditional manufacturing procedures. This helps reduce the complexity of the manufacturing process and improve production efficiency. The rectangular stainless steel sheet undergoes double-sided polishing and double-sided film coating to ensure the surface is free of pits and the diagonal error is less than or equal to 2mm. This step improves the product's appearance quality and reduces potential surface defects.

[0042] This invention achieves barrel body shaping by adjusting welding parameters such as welding wire diameter, current, and argon flow rate, which helps improve welding quality and stability and reduce welding defects. A laser cutting machine is used to laser-cut holes in the lower end cap to form drainage holes, and in the upper end cap to form flange mounting holes, vapor phase holes, spray mounting holes, safety valve mounting holes, and monitoring holes. This allows for precise and rapid hole cutting, improving the accuracy and consistency of the holes. By employing argon arc welding and laser welding, and controlling welding parameters including current and argon flow rate, comprehensive welding quality control is achieved. This is particularly beneficial in controlling error variations, weld width, and height, thus improving welding quality.

[0043] This invention involves welding multiple support leg plates to the perimeter of the container body, and then welding the support legs to the plates to form the container body. Laser welding of the curved plates ensures a strong weld, making the container more stable.

[0044] This invention polishes the fillet welds of each pipe fitting, using different tools and processing agents for different polishing treatments to ensure the surface quality of each part. This helps to improve the overall appearance and surface finish of the ton container.

[0045] This invention conducts comprehensive sealing tests on the ton container by introducing airtightness tests, water-filling tests, and hydraulic tests, ensuring that the product will not leak during actual transportation and use, thus improving the safety of the ton container.

[0046] This invention, by conducting comprehensive inspections of the outer and inner surfaces before warehousing, including dimensional measurements, thread checks, weld quality inspections, and inner surface polishing, helps to promptly identify and repair potential quality problems, ensuring that products meet standards. Attached Figure Description

[0047] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0048] Figure 1 This is a schematic diagram of the overall structure of the ton container formed by this invention.

[0049] Figure 2 This is a schematic diagram of the dimensions of the rectangular stainless steel plate of the present invention (unit: mm).

[0050] Figure 3 This is a schematic diagram of the structure of the barrel body of the present invention.

[0051] Figure 4 This is a schematic diagram of the structure of the lower end cap of the present invention.

[0052] Figure 5 This is a schematic diagram of the dimensions and structure of the drain hole of the present invention (unit: mm).

[0053] Figure 6 This is a schematic diagram of the lower end cap and barrel body after welding.

[0054] Figure 7 This is a schematic diagram of the structure of the upper end cap of the present invention.

[0055] Figure 8 This is a schematic diagram of the dimensions of the head and holes of the present invention (unit: mm).

[0056] Figure 9 This is a schematic diagram of the dimensions of the lower end cap of the present invention (unit: mm).

[0057] Figure 10 This is a schematic diagram of the welded pipe fittings on the top end cap of the present invention.

[0058] Explanation of reference numerals in the instruction manual:

[0059] 1. Barrel body;

[0060] 2. Lower end cap; 21. Drain hole; 22. Drain pipe;

[0061] 3. Top end cap; 31. Flange mounting hole; 32. Vapor phase port; 33. Spray mounting hole; 34. Safety valve mounting hole; 35. Monitoring hole;

[0062] 41. Open flange; 42. Inserted bottom pipe; 43. Air inlet pipe; 44. Spray pipe; 45. Transformer fitting; 46. Butt flange fitting;

[0063] 5. Curved guard plate;

[0064] 6. Supporting leg;

[0065] 7. Molded ton containers. Detailed Implementation

[0066] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0067] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0068] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0069] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0070] Reference Figures 1 to 9 As shown, a stainless steel ton-shaped drum forming process of the present invention includes:

[0071] Step S1: Provide a rectangular stainless steel plate, form the rectangular stainless steel plate into a cylindrical body, and then weld the two ends together to form the barrel body 1. (Refer to...) Figures 2 to 3 As shown.

[0072] The rectangular stainless steel plate (304 stainless steel) is polished on both sides and then covered with a protective film on both sides. The plate surface is free of pits and the diagonal error is less than or equal to 2mm.

[0073] The rectangular stainless steel plate is rolled into a cylindrical shape using a universal rolling mill. Both ends are then argon arc welded using a 1.2mm diameter stainless steel welding wire. The argon arc welding current is 120-140A. Argon gas is supplied for 2 seconds before welding begins and for another 3 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. During welding, argon gas is supplied for protection on the back side of the welding area, allowing for single-sided welding and double-sided forming.

[0074] Step S2: Provide a lower head 2 with an ellipsoidal surface, as shown in the figure.Figure 4 , Figure 9 As shown, the ellipticity of the lower end cap 2 is ±3mm. A laser cutting machine is used to laser-cut holes in the lower end cap 2 to form a drain hole 21. (Refer to...) Figure 5 As shown.

[0075] Step S3: Rivet and spot weld the circumferential opening of the lower end cap 2 to the circumferential opening of the barrel body 1, and weld the drain pipe 22 to the drain hole 21, referring to... Figure 6 As shown. Specifically includes:

[0076] When riveting, the riveting error should be controlled to be less than or equal to 0.5mm. Use an argon arc welding machine for argon arc spot welding, and the argon arc welding current should be 100~120A.

[0077] Argon arc welding of the lower circumferential weld was performed using a laser welding machine. The weld width was 8.5±1.5mm and the weld height was 1.5±0.5mm. 1.2mm diameter stainless steel welding wire was used. The current was 110~130A. Argon gas was supplied for 1 second before welding started and for another 1 second after welding ended. The argon gas flow rate was 0.05-0.1MPa. During the welding process, argon gas was supplied for protection on the back side of the welding area. Single-sided welding resulted in double-sided forming.

[0078] When welding the drain pipe 22 to the drain hole 21, double-sided argon arc welding is used with a current of 80~100A. Argon gas is supplied for 2 seconds before welding begins and for another 2 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. The lower end face of the drain pipe 22 is 1~2mm lower than the hole face of the drain hole 21, and the inner surface weld joint must not be higher than the hole face of the drain hole 21.

[0079] Step S4: Provide an upper head 3 with an ellipsoidal surface, referring to... Figure 7 As shown, the ellipticity of the upper end cap 3 is within ±3mm. The lower end cap 2 is laser-cut using a laser cutting machine to form flange mounting holes 31, gas phase holes 32, spray mounting holes 33, safety valve mounting holes 34, and monitoring holes 35. After cutting the holes, the hole spacing and diameter are checked for accuracy. In this embodiment, the dimensions of each hole can be referenced... Figure 8 As shown.

[0080] Step S5: Weld an open flange 41 onto the flange mounting hole 31; install a bottom pipe 42 at the open flange 41; weld an inlet pipe 43 onto the gas phase hole 32; weld a spray pipe 44 onto the spray mounting hole 33; weld a safety valve adapter fitting 45 onto the valve mounting hole; weld a monitoring device (such as a three-in-one gauge) mating flange fitting 46 onto the monitoring hole 35, referring to... Figure 10 As shown.

[0081] When welding the above-mentioned pipe fittings, double-sided argon arc welding is used, with a current of 80~100A. Argon gas is supplied for 2 seconds before welding begins and for another 2 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. The flange mounting hole 31 is located in the middle of the upper end cap 3.

[0082] Step S6: Rivet and spot weld the circumferential opening of the upper end cap 3 to the circumferential opening of the barrel body 1; specifically including:

[0083] When riveting, the riveting error should be controlled to be less than or equal to 0.5mm. Use an argon arc welding machine for argon arc spot welding, and the argon arc welding current should be 100~120A.

[0084] Argon arc welding of the lower circumferential weld was performed using a laser welding machine. The weld width was 8.5±1.5mm and the weld height was 1.5±0.5mm. 1.2mm diameter stainless steel welding wire was used. The current was 110~130A. Argon gas was supplied for 1 second before welding started and for another 1 second after welding ended. The argon gas flow rate was 0.05-0.1MPa. During the welding process, argon gas was supplied for protection on the back side of the welding area. Single-sided welding resulted in double-sided forming.

[0085] Step S7: Weld multiple arc-shaped protective plates 5 around the perimeter of the barrel body 1, and weld the support legs 6 to the arc-shaped protective plates 5 to form the ton barrel body; ensure the height dimension of the barrel body 1 is accurate and its position within the frame is correct before welding the support legs 6. (Refer to...) Figure 1 As shown. Wherein:

[0086] When welding the arc-shaped protective plate 5, laser welding is used to fully weld the three sides of the arc-shaped protective plate 5, leaving a section unwelded in the middle of the bottom edge. Stainless steel welding wire with a diameter of 1.2mm is used, and the current is 400-450A.

[0087] When welding support leg 6, laser welding is used, with stainless steel welding wire of 1.2mm diameter and a current of 400-450A.

[0088] Step S8: Perform surface treatment on the weld seams of the welded parts of the ton container body to obtain the formed ton container 7. Specifically, this includes:

[0089] For the fillet welds of each pipe fitting, polish them with a cloth wheel or fiber wheel, and then polish them with a welding treatment agent.

[0090] The oxide layer on the inner surface of each fitting except the conversion joint fitting 45 is polished with a 240-mesh fiber wheel, and the fine holes of the conversion joint fitting 45 are mechanically polished with sandpaper.

[0091] The inner and outer surfaces of the upper and lower circumferential welds formed by the upper end cap 3 and the lower end cap 2 and the barrel body 1 are polished with a 304 stainless steel pneumatic wire brush to remove surface black scale and weld beads and slag.

[0092] Step S9: Perform a sealing test on the molded ton container 7 and an inspection of its surface quality before it is put into storage.

[0093] The sealing test includes: airtightness test, water-filling test, and hydraulic test; wherein:

[0094] The airtightness test is applicable to all tonnes containing liquids, serving as a design model test. Before the test, tonnes must be randomly selected for commissioning and sealing. During the test, the tank is placed on a stable platform or frame, and a ball valve is installed at the gas phase port 32. Other vents on the tonne are either non-ventilated or blocked. After opening the ball valve at the gas phase port 32, compressed air is introduced. When the pressure gauge shows a pressure of 0.1 MPa, the ball valve is closed, and pressure is maintained for 10 minutes. Leakage checks are performed on all welded parts using a leak test. If leaks are found, they are repaired and the leak test is repeated. The pass / fail criterion is no leakage.

[0095] The water-filling test is also applicable to all ton containers filled with liquids, as a design model test. Before the test, connect the water pipe and water valve to the open flange 41 of the ton container and record the initial reading of the water meter. Open the water valve and fill the container with tap water until it overflows at the open flange 41, then immediately close the water valve and record the final reading of the water meter. Before the test, clean the outer surface of the welded joint and ensure it is dry. Observe whether there is any leakage at each welded part. The test time is 1 hour. If leakage is found, repair it and retest for leakage. The qualification requirement is no leakage.

[0096] The hydraulic test is also applicable to all tonnes filled with liquids, serving as a design model test. During the test, connect the water pipe and valve at the open flange 41 of the tonne container and record the initial water meter reading. Pour in tap water until it overflows at the open flange 41, then close the water valve. The test liquid temperature should not be lower than 5℃. Reopen the inlet valve and flush until the pressure gauge reads 0.1MPa. Close the water valve and time for 30 minutes. Record the final water meter reading. Before the test, clean and dry the outer surface of the welded joints, and check for leaks at each welded part. If leaks are found, repair them and retest for leaks. The pass / fail criterion is no leakage.

[0097] The surface quality inspection before warehousing includes:

[0098] The inspection of the outer surface includes: measuring the outer dimensions of the ton container to ensure that the dimensions of the ton container meet the specified standards; using a go / no-go gauge to inspect the 42 threads of the bottom pipe, the 43 threads of the air inlet pipe, and the 22 threads of the drain pipe; inspecting all welds on the outer surface to ensure that the welding is continuous and there are no defects such as missed welds or penetrations; and checking whether it meets the relevant accessory installation requirements for loading.

[0099] Inspection of the inner surface includes: checking for scratches, ensuring the surface is smooth and free of obvious defects; inspecting the welds on the inner surface to confirm the continuity of the weld formation and to check whether the welds have been polished; performing electrolytic polishing on the inner surface and ensuring that there are no defects such as watermarks on the polished surface.

[0100] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A forming process for stainless steel ton containers, characterized in that, include: A rectangular stainless steel plate is provided. After the rectangular stainless steel plate is formed into a circular cylinder, the two ends are welded together to form a barrel body. A lower end cap with an ellipsoidal surface is provided, and a laser cutting machine is used to laser-cut holes in the lower end cap to form a drain hole; After riveting the circumferential opening of the lower end cap to the circumferential opening of the barrel body, spot weld them together, and then weld the drain pipe to the drain hole. An upper end cap with an ellipsoidal surface is provided, and a lower end cap is laser-cut using a laser cutting machine to form flange mounting holes, gas phase holes, spray mounting holes, safety valve mounting holes, and monitoring holes; Weld an open flange to the flange mounting hole, install a bottom pipe at the open flange, weld an inlet pipe to the gas phase hole, weld a spray pipe to the spray mounting hole, weld a safety valve conversion connector to the safety valve mounting hole, and weld a monitoring device docking flange to the monitoring hole. The opening periphery of the upper end cap is riveted to the opening periphery of the barrel body and then spot welded. Multiple arc-shaped protective plates are welded to the periphery of the barrel body, and the support legs are welded to the arc-shaped protective plates to form the ton barrel body; The weld seams of the welded parts of the ton barrel body are subjected to surface treatment to obtain a shaped ton barrel; The molded ton containers were subjected to sealing tests and surface quality inspections before being put into storage. The process of riveting and spot welding the opening periphery of the lower end cap to the lower opening periphery of the barrel body, and riveting and spot welding the opening periphery of the upper end cap to the upper opening periphery of the barrel body, both include: The ellipticity of the lower end cap and the upper end cap is within ±3mm. When riveting, the riveting error is controlled to be less than or equal to 0.5mm. Argon arc welding is performed using an argon arc welding machine with an argon arc welding current of 100~120A. Argon arc welding of the lower circumferential weld was performed using a laser welding machine. The weld width was 8.5±1.5mm and the weld height was 1.5±0.5mm. 1.2mm diameter stainless steel welding wire was used. The current was 110~130A. Argon gas was supplied for 1 second before welding started and for another 1 second after welding ended. The argon gas flow rate was 0.05-0.1MPa. During welding, argon gas protection was supplied to the back of the welding area. Single-sided welding resulted in double-sided forming. An open flange is welded onto the flange mounting hole, including: Argon arc welding is performed using an argon arc welding machine with 1.2mm diameter stainless steel welding wire; the argon arc welding current is 120~140A; argon gas is supplied for 2 seconds before welding begins; and argon gas is supplied for 3 seconds after welding ends. Laser welding of the outer surface is performed using a laser welding machine with an argon gas flow rate of 0.05-0.1 MPa and a current of 400-450 A. The process includes welding the sewage pipe to the sewage outlet, welding the air inlet pipe to the gas phase outlet, welding the spray pipe to the spray mounting hole, welding the safety valve conversion connector to the safety valve mounting hole, and welding the monitoring device docking flange to the monitoring hole. All of these steps include: Double-sided argon arc welding is used, with a current of 80~100A. Argon gas is supplied for 2 seconds before welding begins and for another 2 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. Multiple arc-shaped protective plates are welded to the periphery of the barrel, and the support legs are welded to the arc-shaped protective plates, including: When welding the arc-shaped protective plate, laser welding is used to fully weld the three sides of the arc-shaped protective plate, leaving a section unwelded in the middle of the bottom edge. 1.2mm diameter stainless steel welding wire is used, and the current is 400-450A. When welding the support legs, laser welding is used, with stainless steel welding wire of 1.2mm diameter and a current of 400-450A. The sealing test includes: airtightness test, water-filling test, and hydraulic test; wherein: The airtightness test is applicable to all tonnes containing liquids, serving as a design model test. Before the test, tonnes must be randomly selected for commissioning and sealing. During the test, the tank is placed on a stable platform or frame, and a ball valve is installed at the gas phase port. Other vents of the tonne are either non-ventilated or blocked. After opening the ball valve at the gas phase port, compressed air is introduced. When the pressure gauge shows a pressure of 0.1 MPa, the ball valve is closed, and pressure is maintained for 10 minutes. Leakage checks are performed on all welded parts using a leak test. If leaks are found, they are repaired and the leak test is repeated. A pass / fail test requires no leakage. The water-filling test is also applicable to all ton containers filled with liquids, as a design model test. Before the test, connect the water pipe and water valve to the open flange of the ton container and record the initial value of the water meter. Open the water valve and fill the container with tap water until it overflows at the open flange. Then immediately close the water valve and record the final value of the water meter. Observe whether there is any leakage at each welded part. The test time is 1 hour. If leakage is found, repair it and retest for leakage. The qualification requirement is no leakage. Hydraulic testing is also applicable to all ton containers filled with liquids, serving as a design model test. During the test, connect the water pipe and valve to the open flange of the ton container and record the initial reading of the water meter. Pour in tap water until it overflows at the open flange, then close the water valve. The test liquid temperature should not be lower than 5°C. Reopen the inlet valve and flush until the pressure gauge reads 0.1 MPa. Close the water valve and time for 30 minutes. Record the final reading of the water meter and check for leaks at all welded joints. If leaks are found, repair them and retest for leaks. The qualification requirement is no leakage.

2. The stainless steel ton-shaped drum forming process according to claim 1, characterized in that, A rectangular stainless steel plate is provided. After the rectangular stainless steel plate is formed into a circular cylinder, the two ends are welded together to form a cylinder body, including: The rectangular stainless steel plate is polished on both sides and then covered with a protective film on both sides. The plate surface is free of pits and the diagonal error is less than or equal to 2mm. The rectangular stainless steel plate is rolled into a cylindrical shape using a universal rolling mill. Both ends are then argon arc welded using a 1.2mm diameter stainless steel welding wire. The argon arc welding current is 120-140A. Argon gas is supplied for 2 seconds before welding begins and for another 3 seconds after welding ends. The argon gas flow rate is 0.05-0.1MPa. During welding, argon gas is supplied for protection on the back side of the welding area, allowing for single-sided welding and double-sided forming.

3. The stainless steel ton-shaped drum forming process according to claim 1, characterized in that, The flange mounting hole is located in the middle of the upper end cap. The lower end face of the drain pipe is 1-2 mm lower than the hole surface of the drain hole. The inner surface weld joint shall not be higher than the hole surface of the drain hole.

4. The stainless steel ton-shaped drum forming process according to claim 1, characterized in that, Surface treatment of the weld seams at the welded parts of the ton body includes: For the fillet welds of each pipe fitting, polish them with a cloth wheel or fiber wheel, and then polish them with a welding treatment agent. The oxide layer on the inner surface of each fitting, except for the conversion joint fitting, is polished using a 240-mesh fiber wheel. The fine holes of the conversion joint fitting are mechanically polished using sandpaper. The inner and outer surfaces of the upper and lower circumferential welds formed by the upper and lower end caps and the barrel body are polished with a 304 stainless steel pneumatic wire brush to remove surface black scale, weld beads and slag.

5. The stainless steel ton-shaped drum forming process according to claim 1, characterized in that, The surface quality inspection before warehousing includes: The inspection of the outer surface includes: measuring the outer dimensions of the ton container to ensure that the dimensions of the ton container meet the specified standards; using a go / no-go gauge to inspect the threads at the bottom pipe, the air inlet pipe, and the drain pipe; inspecting all welds on the outer surface to ensure that the welding is continuous and there are no incomplete welds or penetration defects; and checking whether it meets the relevant accessory installation requirements for loading. Inspection of the inner surface includes: checking for scratches, ensuring the surface is smooth and free of obvious defects; inspecting the welds on the inner surface to confirm the continuity of the weld formation and to check whether the welds have been polished; performing electropolishing of the inner surface and ensuring that there are no watermarks or defects on the polished surface.

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