A container base holding structure and a base welding method

Abstract

This application relates to the field of welding technology, and particularly to a container base holding structure and a base welding method. The container base holding structure includes a base that supports the bottom of the arc-shaped lower cover of the container; a protective cover that covers one end of the base away from the container, and the end of the protective cover covering the base is detachably and hermetically connected to the base, and a through hole is provided on the protective cover; a welding cavity is formed among the base, the protective cover, and the container lower cover. The welding method includes: assembling the base and the protective cover to the container lower cover and leveling them through a leveler; spot welding and positioning between the base and the container lower cover; injecting argon into the welding cavity and sequentially welding the welds. After welding a part of the welds, adjust the gas injection pressure to control the gas flow rate leaking from the un-welded welds to be maintained between 15 and 30 L / min. In this application, a welding cavity is formed by sleeving the protective cover on the base, so that argon can continuously protect the welding, thereby improving the welding effect and reducing the possibility of generating abnormal colors during welding.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular, to a container base holding structure and a base welding method. Background Art

[0002] The bottom of a chemical container is usually an arc protruding away from the inside of the container. To keep the container stable, a base is generally welded to the bottom of the container to ensure the safety of the container. Generally, a spirit level is used for correction during assembly. However, for a slightly larger base, it is impossible to detect fine differences when using a spirit level for detection, resulting in an uneven bottom surface after welding.

[0003] During the welding of the container, due to the high temperature effect, the welding contacts the air, and oxidation occurs during the welding process. The welding position and the surrounding area A are prone to welding discoloration, which is not easy to remove in the welding gap between the container and the barrel body. Moreover, it is extremely easy for polishing foreign matters to remain after removal, consuming a large amount of manpower, time, etc., causing waste of resources and affecting production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing container bottom is prone to discoloration during the welding of the base and is not easy to remove.

[0005] To this end, the present invention provides a container base holding structure and a base welding method.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A container base holding structure includes:

[0008] A base, which is supported under the arc-shaped lower cover of the container;

[0009] A protective cover, which covers one end of the base away from the container. The end of the protective cover covering the base is detachably and hermetically connected to the base, and through holes are provided on the protective cover;

[0010] A welding cavity is formed among the base, the protective cover, and the container lower cover.

[0011] By adopting the above technical solution, a protective cover is sleeved on the base to form a welding cavity. During welding, argon gas can be input through the through hole to the welding part between the base and the lower cover of the container, so as to protect the welding. The setting of the welding cavity can make the input argon gas disperse evenly to the surrounding welding parts, and make the argon gas not easy to escape and disperse, thereby improving the welding effect, reducing the possibility of generating abnormal colors during welding, reducing rework, improving production efficiency and quality, and thus realizing batch operation, saving time and improving production efficiency. And the protective cover is detachably connected to the base. After welding is completed, after removing the protective cover, it is convenient to perform post-treatment operations such as polishing on the welded part.

[0012] Further, the through hole is coaxially arranged with the container, and the inner diameter D of the through hole is 5-10 mm.

[0013] Further, the distance H between the lowest end of the lower cover of the container and the inner bottom surface of the protective cover is 0.1D-0.2D.

[0014] Further, a leveler is further included. The leveler is used to adjust the levelness between the upper end surface of the lower cover of the container and the bottom surface of the protective cover. The leveler includes a pressing plate and a plurality of leveling columns. The plurality of leveling columns are circumferentially arranged around the protective cover. The pressing plate is arranged between the plurality of leveling columns. The pressing plate is axially slidably connected to the leveling columns and the protective cover. Scale lines are arranged on the leveling columns. The pressing plate and the protective cover are detachably connected through a connecting component.

[0015] Further, the connecting component includes a main shaft, a resisting rod and a bushing. The bushing is arranged at one end of the pressing plate facing the protective cover. The head of the main shaft is located at one end of the bushing close to the protective cover. The rod body of the main shaft is arranged away from the protective cover. The rod body of the main shaft penetrates through the bushing and is threadedly connected to the bushing. Two symmetrically arranged connecting rods are hinged on the outer side wall of the bushing. The length of the connecting rod can be telescoped. The other end of the connecting rod is hinged to the middle part of the resisting rod. One end of the resisting rod is slidably connected to one end of the main shaft facing the protective cover along the circumferential direction of the main shaft.

[0016] A welding method for a container base holding structure includes the following steps:

[0017] Step 1, assemble the base, the protective cover to the lower cover of the container, and adjust the levelness of the base by measuring the height B between the upper end surface of the lower cover of the container and the bottom surface of the protective cover through the leveler;

[0018] Step 2, perform spot welding positioning between the base and the lower cover of the container, and keep a gap of less than 1 mm between the base and the protective cover;

[0019] Step three, inject argon gas into the welding cavity through the through hole, and weld the welds between the spot welding positions in turn. After each weld is completed, adjust the gas injection pressure to control the gas flow rate leaking from the unwelded weld to be maintained between 15 and 30 L / min.

[0020] Furthermore, the spacing between adjacent spot welding positions is 1 / 4 to 1 / 16 of the circumference of the base.

[0021] Furthermore, in step three, the welding adopts automatic argon arc welding, the welding speed is 100~120mm / min, the welding current is 85~100A, the wire feeding speed is 450~650mm / min, and the tracking voltage is 9~12V.

[0022] Furthermore, if the number of spot welding positions n in step 2 is an even number, then in step 3, any one weld is selected and recorded as R 1 , the welds are marked as R along the circumference of the base 2 , R 3 ……R n , when welding, Perform welding.

[0023] Furthermore, if the number of spot welding positions n in step 2 is an odd number and n is greater than 1, then in step 3, any one weld is selected and recorded as R 1 , the welds are marked as R along the circumference of the base 2 , R 3 ……R n , when welding, Perform welding.

[0024] The beneficial effect of the present invention is that a protective cover is sleeved on the base to form a welding chamber. During welding, argon gas can be input to the welding part between the base and the lower cover of the container through the through hole, so as to protect the welding. The setting of the welding chamber can make the input argon gas evenly dispersed to the welding parts around, and make it difficult for the argon gas to escape and disperse, thereby improving the welding effect, reducing the possibility of different colors in welding, reducing rework, and improving production efficiency and quality, so as to realize batch operation, save time, and improve production efficiency. In addition, the protective cover is detachably connected to the base. After the welding is completed, the protective cover is removed, which is convenient for post-processing operations such as polishing of the welding part.

[0025] According to the curvature of the lower cover of the container and the diameter of the base, the aperture of the through hole and the distance between the bottom surface of the protective cover and the lower end of the lower cover of the container are adjusted, so that when the gas is transported, after the gas contacts the point O at the lower end of the lower cover of the container and is pressurized, it is evenly dispersed to the surroundings at a suitable speed;

[0026] During welding, after welding a part of the weld seam, the opposite weld seam is welded, so that during welding, argon gas also leaks out evenly to both sides of the base, avoiding the discharge of argon gas from one side of the base, resulting in uneven air pressure and offset deformation between the base and the container.

[0027] During the welding process, after welding each part of the weld seam, adjust the gas injection pressure, so that the air pressure and ventilation volume passing through each weld seam during the welding process remain relatively stable, thereby improving the uniformity of the weld seam and the quality of the weld seam. Brief Description of the Drawings

[0028] The present invention will be further described below in conjunction with the drawings and embodiments.

[0029] Figure 1 It is a schematic structural diagram of the container base holding structure in the present invention.

[0030] Figure 2 It is a schematic structural diagram of the positional relationship between the retainer and the leveler in the present invention.

[0031] Figure 3 It is a schematic diagram of the state before locking between the connecting component and the protective cover in the present invention.

[0032] Figure 4 It is a schematic diagram of the locked state between the connecting component and the protective cover in the present invention.

[0033] Figure 5 It is a schematic diagram of the U area in the present invention.

[0034] Figure 6 It is a schematic diagram when the number of spot welding positions in the present invention is even.

[0035] Figure 7 It is a schematic diagram when the number of spot welding positions in the present invention is odd.

[0036] In the figure: 1. Lower cover; 2. Base; 3. Protective cover; 31. Through hole; 4. Leveler; 41. Bottom ring; 42. Leveling column; 43. Pressing plate; 44. U-shaped frame; 45. Positioning bolt; 46. Connecting component; 461. Reinforcing nut; 462. Bush; 463. Main shaft; 464. Pushing rod; 465. Connecting rod; 5. Fastener. Detailed Embodiment

[0037] The present invention will now be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] A container base holding structure includes a base 2, a protective cover 3, and a leveler 4. The base 2 is set to be annular, and the base 2 is coaxially supported at the bottom of the arc-shaped lower cover 1 of the container. Among them, the lower cover is a standard elliptical cover with the ratio of the major axis to the minor axis being 2:1, the diameter of the lower cover is d, and the elliptical lower cover satisfies the formula , and the base 2 is welded to the container lower cover 1, and the diameter of the base 2 is adapted to the diameter of the lower cover.

[0041] The protective cover 3 is sleeved on one end of the base 2 away from the container lower cover 1. One end of the base 2 away from the container lower cover 1 abuts against the inner bottom of the protective cover 3. A through hole 31 is provided at the bottom of the protective cover 3. The through hole 31 is coaxially arranged with the container lower cover 1. The protective cover 3 and the base 2 are hermetically connected by a fastener 5, and a welding cavity is formed among the base 2, the protective cover 3, and the container lower cover 1. Specifically, the diameter D of the through hole 31 is 5-10 mm, and the distance H between the lowest point O of the container lower cover 1 and the inner bottom surface of the protective cover 3 is 0.1D-0.2D.

[0042] Referring to Figure 5 , Figure 5The base diameters in the small figures a and b are the same, and the arc of the lower cover of the container in small figure a is smaller than that of the lower cover of the container in small figure b. If the position of point O is too close to the through hole 31, when injecting gas, the injection pressure is high and there will be resistance during gas injection. Under the condition of the same perimeter of the base 2, the smaller the arc of the lower cover 1 of the container, the greater the slope around point O of the lower cover 1 of the container, and the larger the volume of the U area. Then, the longer the time it takes for the gas to fill the U area. At this time, selecting a smaller H within the above range can appropriately increase the flow rate of the gas in the welding cavity, enabling the argon gas to quickly reach the weld area, fill the U area, and improve the welding efficiency.

[0043] The leveler 4 includes a bottom ring 41, leveling columns 42, and a pressing plate 43. There are multiple leveling columns 42. Preferably, the number of leveling columns 42 is an even number. The multiple leveling columns 42 are fixedly connected to the bottom ring 41 along the circumferential direction of the bottom ring 41. The circumferential direction of the leveling columns 42 is arranged along the axial direction of the bottom ring 41. Scale lines are arranged along the axial direction of the leveling columns 42. When the number of leveling columns 42 is 2, both ends of the pressing plate 43 are slidably connected to the two leveling columns 42 along the axial direction of the leveling columns 42. When the number of leveling columns 42 exceeds two, the pressing plate 43 can be arranged in a radial shape, and when the end of the pressing plate 43 is slidably connected to the leveling columns 42 along the axial direction of the leveling columns 42.

[0044] It should be noted that a U-shaped frame 44 is connected to the end of the pressing plate 43. The pressing plate 43 is connected to the side wall of the U-shaped frame 44. The leveling columns 42 are located inside the U-shaped frame 44. A positioning bolt 45 is threadedly connected to the side wall of the U-shaped frame 44 away from the pressing plate 43. The positioning bolt 45 penetrates the side wall of the U-shaped frame 44 and abuts against the leveling column 42.

[0045] It should be noted that a connecting component 46 is arranged at the center of the pressing plate 43. The connecting component 46 is used to connect the pressing plate 43 and the protective cover 3. The connecting component 46 includes a main shaft 463, a reinforcing nut 461, a resisting rod 464, and a bushing 462. The reinforcing nut 461 is embedded in the side wall of the pressing plate 43 facing the protective cover 3. The bushing 462 is coaxially connected to one end of the reinforcing nut 461 facing the protective cover 3. The head of the main shaft 463 is located at one end of the bushing 462 close to the protective cover 3. The rod body of the main shaft 463 is arranged away from the protective cover 3. The rod body of the main shaft 463 penetrates the bushing 462 and is threadedly connected to the bushing 462. Two connecting rods 465 are hinged on the outer side wall of the bushing 462. The two connecting rods 465 are symmetrically arranged. The connecting rods 465 are telescopic rods. The other end of the connecting rod 465 is hinged to the middle part of the resisting rod 464. A ring groove is arranged on the side wall of the head of the main shaft 463 facing its rod body. The cross-section of the ring groove is spherical. A limiting block is connected to one end of the resisting rod 464. The limiting block is spherical. The limiting block is located in the ring groove and is slidably connected to the ring groove with the axis of the main shaft 463 as the center.

[0046] A welding method for a container base holding structure includes the following steps.

[0047] Step 1: Install the base 2 and the protective cover 3 on the bottom of the container lower cover 1 in sequence. Measure the height B between the bottom surface of the protective cover 3 and the upper end surface C of the container lower cover 1 through the leveler 4 to adjust the levelness and stability of the base 2.

[0048] Place the arc surface value of the container lower cover 1 facing upwards, place the upper end surface of the container lower cover 1 on a horizontal tabletop, and sleuth the bottom ring 41 around the outer periphery of the container lower cover 1, so that the head of the main shaft 463 is set away from the bushing 462. At this time, as Figure 3 shown, the projection of the end of the abutting rod 464 away from the main shaft 463 on the bottom surface of the protective cover 3 is located within the through hole 31. This state is the initial state of the abutting rod 464. Insert the main shaft 463 and the bushing 462 into the through hole 31, so that the bushing 462 is coaxially arranged with the through hole 31. Then rotate the main shaft 463, and the head of the main shaft 463 moves towards the bushing 462. The connecting rod 465 is compressed, and the end of the abutting rod 464 away from the main shaft 463 moves away from the main shaft 463 until it abuts against the inner bottom surface of the protective cover 3, thereby realizing the installation between the pressing plate 43 and the protective cover 3. At this time, the pressing plate 43 is completely in contact with the protective cover 3.

[0049] Then observe the scale on the leveling column 42 and adjust the relative position between the end of the pressing plate 43 and the leveling column 42 to level the pressing plate 43 and the protective cover 3.

[0050] Step 2: Weld the base 2 to the container lower cover 1. Use spot welding to pre-fix the base 2 on the container lower cover 1. The spot welding positions are evenly arranged along the circumference of the base 2. The distance between adjacent spot welding positions is 1 / 4 to 1 / 16 of the base circumference, and the number of weld spots n is at least 3. In this embodiment, the distance between adjacent weld spots is 10 to 20 cm.

[0051] In this embodiment, four weld spots are provided. As Figure 6 shown, the four weld spots divide the weld seam between the base 2 and the container lower cover 1 into four sections. The four weld seams are sequentially defined as weld seams R1, R2, R3, and R4 along the circumference of the base 2. The weld seam R1 and the weld seam R3 are centrally symmetric with respect to the axis of the base 2, and the weld seam R2 and the weld seam R4 are centrally symmetric with respect to the axis of the base 2.

[0052] Manual argon arc welding is used for spot welding, the welding current is 110 A to 145 A, and the gap between the base 2 and the container lower cover 1 during spot welding is less than 1 mm.

[0053] Step three, disassemble the leveler 4, rotate the main shaft 463 in the opposite direction so that the head of the main shaft 463 moves away from the sleeve 462, and the end of the push rod 464 away from the sleeve 462 moves toward the sleeve 462, so that the end of the push rod 464 away from the sleeve 462 returns to its initial state, remove the sleeve 462 and the main shaft 463 from the through hole 31, and separate the pressure plate 43 from the protective cover 3.

[0054] Step 4: welding is performed by uniformly introducing argon gas into the welding chamber through the through hole 31 to weld the weld. The welding is performed by automatic argon arc welding, with a welding speed of 100-120 mm / min, a welding current of 85-100 A, a wire feeding speed of 450-650 mm / min, and a tracking voltage of 9-12 V. The specific welding process is as follows:

[0055] S4.1 The protective gas is argon gas and the injection pressure is 0.3kpa~0.5kpa. 1 Perform welding.

[0056] S4.2 The protective gas is uniformly introduced into the welding chamber through the through hole 31, and the gas pressure is reduced by 3~5%. 3 Perform welding.

[0057] S4.3 The protective gas is uniformly introduced into the welding cavity through the through hole 31. The gas delivery pressure is reduced by 5-10% compared with the initial gas injection pressure. 2 Perform welding.

[0058] S4.4 The protective gas is uniformly introduced into the welding cavity through the through hole 31. The gas delivery pressure is reduced by 10~15% compared with the initial gas injection pressure. 4 Perform welding.

[0059] It should be noted that when injecting gas, after welding each part of the weld, the gas injection pressure is adjusted so that the pressure difference between the through hole 31 and the weld is 0.1kpa~0.3kpa, so as to control the gas flow rate leaking from the unwelded weld to be maintained between 15~30L / min.

[0060] In other embodiments, if the number of spot welding positions n is an even number, then in step 3, any one weld is selected and recorded as R 1 , the welds along the circumference of the base are marked as R 2 , R 3 ……R n , when welding, Perform welding;

[0061] If the number of spot welding positions n is an odd number and n is greater than 1, in step 3, any one weld is recorded as R 1 , the welds along the circumference of the base are marked as R2 , R 3 ……R n , during welding, successively weld .

[0062] For example, when the number of spot welding positions is 7, as Figure 7 shown, there are weld seams R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 . During welding, in the order of R 1 , R 4 , R 7 , R 3 , R 6 , R 2 , R 5 for welding.

[0063] To sum up, the protective cover 3 is sleeved on the base 2 to form a welding cavity. During welding, argon can be input into the welding part between the base 2 and the lower cover 1 of the container through the through hole 31, so as to protect the welding. The setting of the welding cavity can make the input argon disperse evenly to the surrounding welding parts, and make the argon not easy to escape and disperse, thereby improving the welding effect, reducing the possibility of generating abnormal colors during welding, reducing rework, improving production efficiency and quality, and thus realizing batch operation, saving time and improving production efficiency. And the protective cover 3 and the base 2 are detachably connected. After welding, after removing the protective cover 3, it is convenient to perform post-treatment operations such as polishing on the welded part.

[0064] According to the radian of the lower cover 1 of the container and the diameter of the base 2, adjust the aperture of the through hole 31 and the distance between the bottom surface of the protective cover 3 and the lower end of the lower cover 1 of the container, so that when the gas is input, after the gas contacts the O point at the lower end of the lower cover 1 and is pressurized, it overflows evenly towards the surrounding at a suitable speed;

[0065] During welding, after welding a part of the weld seam, weld the opposite weld seam, so that during welding, argon also leaks out evenly to both sides of the base 2, avoiding argon exhausting from one side of the base 2, resulting in uneven air pressure and offset deformation between the base 2 and the container;

[0066] During the welding process, after welding a part of the weld seam each time, adjust the gas injection pressure, so that the air pressure and gas flow through each weld seam remain relatively stable during the welding process, thereby improving the uniformity of the weld seam and the quality of the weld seam.

[0067] Taking the ideal embodiments of the present invention described above as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A container base holding structure, characterized in that: include, A base (2), the base (2) being arranged in a ring shape, and the base (2) being coaxially arranged at the bottom of the arc-shaped lower cover (1) of the container; A protective cover (3), the protective cover (3) being arranged on an end of the base (2) away from the container, the end of the protective cover (3) being arranged on the base (2) being detachably sealed and connected to the base (2), and a through hole (31) being arranged on the protective cover (3); A welding cavity is formed between the base (2), the protective cover (3) and the container lower cover (1); The through hole (31) is coaxially arranged with the container, and the inner diameter D of the through hole (31) is 5-10 mm; The distance H between the lowest end of the container lower cover (1) and the inner bottom surface of the protective cover (3) is 0.1D-0.2D; The container further comprises a leveler (4), wherein the leveler (4) is used to adjust the horizontality between the upper end surface of the container lower cover (1) and the bottom surface of the protective cover (3). When the leveler (4) is used, the arc surface of the container lower cover (1) is placed vertically upward, and the upper end surface of the container lower cover (1) is placed on a horizontal surface. The leveler (4) comprises a pressing plate (43) and a plurality of leveling columns (42). The plurality of leveling columns (42) are circumferentially arranged on the periphery of the protective cover (3). The pressing plate (43) is arranged between the plurality of leveling columns (42). The pressing plate (43) is located on a side of the protective cover (3) away from the container lower cover (1). The pressing plate (43) is axially slidably connected to the leveling columns (42) to press the protective cover (3). Graduation lines are provided on the leveling columns (42). The pressing plate (43) and the protective cover (3) are detachably connected via a connecting assembly (46). The connecting assembly (46) comprises a main shaft (463), a push rod (464), a reinforcing nut (461) and a sleeve (462); the reinforcing nut (461) is arranged on the pressure plate (43); the sleeve (462) is coaxially connected to the reinforcing nut (461); the rod body of the main shaft (463) passes through the sleeve (462) and is threadedly connected to the sleeve (462); the head of the main shaft (463) is located at one end of the sleeve (462) close to the protective cover (3); the rod body of the main shaft (463) is arranged away from the protective cover (3); and two hinged outer walls of the sleeve (462) are provided. A symmetrically arranged connecting rod (465) has a length that can be extended and retracted, and the other end of the connecting rod (465) is hinged to the middle part of the supporting rod (464). One end of the supporting rod (464) is slidably connected to the main shaft (463) along the circumference of the main shaft (463). An annular groove is arranged on the side wall of the main shaft (463) with the head facing the rod body, and the cross-section of the annular groove is arranged to be spherical. One end of the supporting rod (464) is connected to a limiting block, and the limiting block is arranged to be spherical. The limiting block is located in the annular groove, and the limiting block slides in the annular groove with the axis of the main shaft (463) as the center.

2. A welding method for a container base holding structure according to claim 1, characterized in that: The following steps are included: Step 1: Assemble the base (2), the protective cover (3) and the lower cover (1) of the container, and adjust the horizontality of the base (2) by measuring the height B between the upper end surface of the lower cover (1) of the container and the bottom surface of the protective cover (3) using a leveler (4); Step 2: spot welding the base (2) and the protective cover (3) to maintain a gap of less than 1 mm between the base (2) and the lower cover (1) of the container; Step three, injecting argon gas into the welding chamber through the through hole (31), and welding the welds between the spot welding positions in sequence. After welding each weld, the gas injection pressure is adjusted to control the gas flow rate leaking from the unwelded weld to be maintained between 15 and 30 L / min.

3. The welding method of the container base holding structure according to claim 2, characterized in that: The spacing between adjacent spot welding positions is 1 / 4 to 1 / 16 of the circumference of the base (2).

4. The welding method of the container base holding structure according to claim 2, characterized in that: In step three, automatic argon arc welding is used, the welding speed is 100~120mm / min, the welding current is 85~100A, the wire feeding speed is 450~650mm / min, and the tracking voltage is 9~12V.

5. The welding method of the container base holding structure according to claim 2, characterized in that: If the number of spot welding positions n in step 2 is an even number, then in step 3, any one weld is recorded as R1, and the welds along the circumference of the base (2) are recorded as R2, R3, ... R n , when welding, Perform welding.

6. The welding method of the container base holding structure according to claim 2, characterized in that: If the number of spot welding positions n in step 2 is an odd number, n is greater than 1, then in step 3, any one weld is recorded as R1, and the welds along the circumference of the base (2) are recorded as R2, R3, ... R n , when welding, Perform welding.

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