CN111215785B - Welding method for high-pressure container - Google Patents
Welding method for high-pressure container Download PDFInfo
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- CN111215785B CN111215785B CN202010297496.9A CN202010297496A CN111215785B CN 111215785 B CN111215785 B CN 111215785B CN 202010297496 A CN202010297496 A CN 202010297496A CN 111215785 B CN111215785 B CN 111215785B
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- pressure container
- main operator
- pressure vessel
- suspension device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/006—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/12—Vessels
Abstract
The invention discloses a welding method of a high-pressure container, which comprises the following steps: s100, selecting a suspension device according to the weight of a main operator, so that the buoyancy of the suspension device is slightly smaller than the gravity of the main operator; s200, fixing the whole body safety belt on a main operator, and then connecting the whole body safety belt with the suspension equipment; s300, welding the high-pressure container, wherein the bottom and the position, close to the bottom, of the side edge of the high-pressure container are welded firstly during welding, then a ladder is installed on the side edge of the high-pressure container, and a main operator holds a welding gun to climb to the top of the high-pressure container from the ladder to weld the rest part; and S400, after welding is finished, returning the main operator to the ground and then detaching the suspension equipment. The safety of the main operator can be ensured even if the main operator slides down from the top of the high-pressure container or slides down from the ladder by arranging the suspension device to protect the main operator.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a high-pressure container welding method.
Background
At present, a high-pressure container generally comprises a pipe body and a base, the height of the base is generally 2 m-3 m, the diameter of the pipe body is generally 2m, the highest height of the high-pressure container is up to 4m, the high-pressure container is generally manufactured in a segmented mode due to large size, then the high-pressure container is spliced, and the pipe body is partially butt-welded during splicing. At present, the following modes are commonly used for welding operation: 1. the welding machine is placed on the ground, a welder holds a welding gun to weld the bottom and the position of the side edge close to the bottom, the position of the side edge close to the top or the position of the top is finished on a ladder or directly squat on the top of the pipe body, the surface of the pipe body of the high-pressure container is smooth, no place for hanging and buckling a safety belt is provided, the operation is very dangerous, the welder and the ladder are easy to slide off the pipe body, and the potential safety hazard is high; 2. a special door-shaped support is carried, so that a welder can climb the positions of the side edge close to the top and the top conveniently, the carrying time and the carrying cost of the support are increased, and the support needs to be dismantled after welding, so that the operation is very inconvenient; 3. the safety buckle is welded on the surface of the pipe body, a welder ties up the safety buckle with the safety belt, and ties up the safety buckle with the safety belt for the ladder, after the pipe body is welded in a butt welding mode, the safety buckle on the surface of the pipe body needs to be cut off by gas, then the welding position of the safety buckle is polished and subjected to flaw detection, the operation is complex, the pipe body is easy to damage, the general thickness of the pipe body is very thick and reaches 50mm, and if the pipe body is damaged by welding an additional safety buckle, the manufacturing cost is greatly increased.
Disclosure of Invention
The embodiment of the invention aims to: the welding method for the high-pressure container is simple to operate, high in safety, high in welding speed and low in cost.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
provided is a high-pressure vessel welding method, comprising the following steps:
s100, providing a suspension device and a whole-body safety belt, selecting the suspension device according to the weight of a main operator, and enabling the buoyancy of the suspension device to be slightly smaller than the gravity of the main operator;
step S200, fixing the whole body safety belt on the body of the main operator, and then connecting the whole body safety belt with the suspension equipment;
step S300, welding the high-pressure container, wherein the bottom and the position, close to the bottom, of the side edge of the high-pressure container are welded firstly during welding, then a ladder is installed on the side edge of the high-pressure container, and a main operator holds a welding gun to climb from the ladder to the top of the high-pressure container to weld the top and the position, close to the top, of the side edge of the high-pressure container;
and S400, after welding is finished, returning the main operator to the ground and then detaching the suspension equipment.
As a preferable mode of the high-pressure vessel welding method, the suspension device is an inflation device, and the suspension device is inflated after the whole body safety belt is tied to the main operator.
As a preferable mode of the high-pressure vessel welding method, the suspension device is an inflation device, and the suspension device is inflated in advance and then connected with the whole body safety belt on the body of the main operator.
As a preferable mode of the high-pressure vessel welding method, before welding the high-pressure vessel, the method further comprises a preparation step of: and (2) performing gas cutting on a groove at the butt joint end of the pipe body of the high-pressure container, polishing the groove until the metallic luster is exposed, then hoisting the two pipe bodies to be butted to a welding position, and adjusting the position to ensure that the distance between the narrowest positions of the grooves of the two pipe bodies is 3-4 mm.
As a preferable scheme of the high-pressure vessel welding method, the step S300 specifically includes:
step S310, the main operator performs front welding on the positions, adjacent to the bottom, of the bottom and the side edges of the high-pressure container from the outer side of the high-pressure container, and the auxiliary operator performs back welding on the positions, adjacent to the bottom, of the bottom and the side edges of the high-pressure container from the inner side of the high-pressure container;
step S320, installing the ladder on the side of the high-pressure container, and enabling the welding gun held by the main operator to climb to the top of the high-pressure container from the ladder;
step S330, the main operator performs the front welding on the positions, adjacent to the top, of the top and the sides of the high-pressure container from the outer side of the high-pressure container, and the auxiliary operator performs the back welding on the positions, adjacent to the top, of the top and the sides of the high-pressure container from the inner side of the high-pressure container;
and the tracks of the front welding and the back welding are the same, the back welding is carried out at the same position after the front welding starting time T, and T is more than or equal to 20s and less than or equal to 40 s.
As a preferable scheme of the welding method of the high-pressure container, the front welding comprises backing welding, filling welding and cover welding, the backing welding, the filling welding and the cover welding are sequentially carried out, the starting time of the back welding is calculated by the starting time of the backing welding, and the back welding starts after the operating time T of the backing welding.
As a preferable scheme of the high-pressure vessel welding method, preheating treatment is needed before the high-pressure vessel welding, the preheating temperature is 100-150 ℃, and then the heat preservation is carried out for 30-60 min.
As a preferable scheme of the high-pressure vessel welding method, the preheating treatment specifically comprises: sequentially winding a heating belt and a heat preservation layer on the peripheries of two butted pipe bodies of the high-pressure container and shielding grooves of the butted positions, preheating the pipe bodies, removing the heating belt and the heat preservation layer which are positioned at the butted positions of the pipe bodies after preheating, retaining the heating belt and the heat preservation layer on two sides of the grooves, stopping heating, and then welding.
In a preferred embodiment of the method for welding a high-pressure container, the sole of the main operator is adhered with a heat insulating layer, and a cooling layer is arranged between the heat insulating layer and the sole.
As a preferable scheme of the welding method of the high-pressure container, the suspension device is connected with the whole-body safety belt through a binding belt, and the length of the binding belt is not less than 3 m.
The embodiment of the invention has the beneficial effects that: through setting up the suspension equipment and protecting main operator, even main operator from the top landing of high-pressure vessel or from the ladder landing, because the buoyancy of suspension equipment slightly is less than main operator's gravity, therefore the suspension equipment can make main operator slowly drop on the ground, guarantees main operator's safety.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
FIG. 1 is a schematic view of a welded state of a high-pressure vessel according to an embodiment of the present invention.
Fig. 2 is a schematic view of a state where a main operator and a sub operator simultaneously weld a high-pressure vessel according to an embodiment of the present invention.
In the figure:
1. a high pressure vessel; 11. a pipe body; 12. a docking position; 2. a main operator; 3. a ladder; 4. a welding gun; 5. a suspension device; 6. and (4) binding the bands.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 (some reference numbers refer to fig. 2), a high-pressure vessel welding method according to an embodiment of the present invention includes the following steps:
step S100, providing a suspension device 5 and a whole-body safety belt (shown in the figure), selecting the suspension device 5 according to the weight of a main operator 2, and enabling the buoyancy of the suspension device 5 to be slightly smaller than the gravity of the main operator 2;
step S200, fixing the full body safety belt on the main operator 2, and then connecting the full body safety belt with the suspension device 5;
step S300, welding the high-pressure container 1, wherein the bottom and the position, close to the bottom, of the side edge of the high-pressure container 1 are welded firstly during welding, then a ladder 3 is installed on the side edge of the high-pressure container 1, and a main operator 2 holds a welding gun 4 to climb from the ladder 3 to the top of the high-pressure container 1 to weld the top of the high-pressure container 1 and the position, close to the top, of the side edge;
step S400, after welding is finished, the main operator 2 returns to the ground and then removes the suspension device 5.
The high-pressure vessel 1's top height is higher, generally about 4 meters to 5 meters, protects main operator 2 through setting up suspension equipment 5, even main operator 2 from the top landing of high-pressure vessel 1 or from the ladder 3 landing, because the buoyancy of suspension equipment 5 slightly is less than main operator 2's gravity, therefore suspension equipment 5 can make main operator 2 slowly drop on the ground, guarantees main operator 2's safety.
In the embodiment of the present invention, the buoyancy of the suspension device 5 slightly smaller than the gravity of the main operator 2 specifically means: the levitation apparatus 5 cannot lift the main operator 2 off, but can achieve a slow descent when the main operator 2 falls from high altitude. According to the formula G = mg, G is the magnitude of the force in cattle (N), m is the mass in kilograms (Kg), G is the coefficient of gravity, which is equal to 9.8 cattle per kilogram (N/Kg), which, for example, is a 60Kg operator, produces G =60 × 9.8=588N, so the buoyancy is slightly less than the gravity, which is chosen in the range 540N-560N.
In this embodiment, the suspension device 5 is an inflation device, and the suspension device 5 performs inflation after the full body harness is tied to the main operator 2. The operation mode can adjust the buoyancy of the suspension device 5 while inflating, so that the buoyancy of the suspension device is slightly smaller than the gravity of the main operator 2, and the operation is simple and quick without calculation.
In other embodiments, the floatation device 5 may also be pre-inflated and then connected to the full body harness on the main operator 2. The method needs to weigh the weight of the main operator 2 in advance and then convert the weight into the buoyancy of the suspension device 5 to further obtain the inflation amount, and the operation method is accurate in inflation.
The density of the gas filled in the suspension device 5 is less than that of air, and specifically, the gas in the suspension device 5 may be hydrogen, helium, or the like. A gas having a density less than air can float.
The suspension device 5 is an airship or a balloon.
Preferably, the gas inside the suspension device 5 is helium. Helium is colorless, tasteless, odorless and gaseous inert gas at normal temperature, has the lowest critical temperature, is the gas which is found in the nature at present and is difficult to liquefy, and has extremely inactive chemical property, can not combust and can not support combustion. Helium is commonly used as an inflation gas in an airship or advertising balloon due to its inert chemical properties and light weight compared to air. Helium is a completely inert gas and does not react with any material. Compared with the explosive hydrogen, the explosive hydrogen has higher safety and operability. Because the welding environment is at a high temperature and welding sparks exist, helium is used as filling gas of the suspension equipment, and the suspension equipment is safer.
In addition, in order to further improve safety, the suspension device 5 is connected with the full body harness by a strap 6, and the length of the strap 6 is not less than 3 m. The height of spark spatter during welding is typically within 2m as tested in the field, so that a length of the strap 6 greater than 3m is effective in preventing spark spatter on the floatation device 5.
In one embodiment, before welding the high-pressure container 1, there is a preparation step, which is: and (2) performing gas cutting on a groove at the butt joint end of the pipe body 11 of the high-pressure container 1, polishing the groove until the metallic luster is exposed, hoisting the two pipe bodies 11 to be in butt joint to a welding position, and adjusting the positions to ensure that the distance between the narrowest positions of the grooves of the two pipe bodies 11 is 3-4 mm.
In this embodiment, as shown in fig. 1 and fig. 2, step S300 specifically includes:
step S310, the main operator 2 performs front welding on the bottom and the position where the side of the high pressure container 1 is adjacent to the bottom from the outside of the high pressure container 1, and the sub operator (not shown in the figure) performs back welding on the bottom and the position where the side of the high pressure container 1 is adjacent to the bottom from the inside of the high pressure container 1;
step S320, installing the ladder 3 on the side of the high-pressure container 1, and enabling the main operator 2 to climb to the top of the high-pressure container 1 from the ladder 3 by holding the welding gun 4;
step S330, the main operator 2 performs the front welding from the outside of the high pressure vessel 1 to the position where the top and the side of the high pressure vessel 1 are adjacent to the top, and the sub operator performs the back welding from the inside of the high pressure vessel 1 to the position where the top and the side of the high pressure vessel 1 are adjacent to the top;
and the tracks of the front welding and the back welding are the same, the back welding is carried out at the same position after the front welding starting time T, and T is more than or equal to 20s and less than or equal to 40 s.
The same trace here means that the obverse side welding and the reverse side welding are both welded in the same direction, and as shown in fig. 2, the obverse side welding and the reverse side welding are both welded in the counterclockwise direction of the pipe body 11.
By adopting a double-side welding mode, the back welding is started later than the front welding, the back welding can be carried out in a short time after the front welding, and the welding line of the butt joint position 12 is not completely formed at the moment, so that welding slag does not need to be cleaned, and the welding slag can be eliminated by the back welding. Usually, after a thick plate or a thick pipe is welded, reverse side cleaning of welding slag and repair welding are needed, but the method directly saves the procedure of cleaning the welding slag, reduces the cost, accelerates the speed of welding seam forming, directly shortens half of welding time, and has good welding seam forming quality and few reworking procedures.
Further, the front welding comprises backing welding, filling welding and cover welding, the backing welding, the filling welding and the cover welding are sequentially carried out, the starting time of the back welding is calculated by the starting time of the backing welding, and the back welding starts after the welding operation time T of the backing welding. The back welding is immediately carried out after the backing welding is started, so that not only can welding slag on the back be eliminated, but also the thickness of the backing welding can be increased, and the quality of the filling welding and the cover surface welding is ensured.
In one embodiment, the high pressure vessel 1 needs to be preheated before welding, the preheating temperature is 100-150 ℃, and then the temperature is kept for 30-60 min.
In this embodiment, the preheating treatment specifically includes: winding heating strips and heat preservation layers on the peripheries of two butted pipe bodies 11 of the high-pressure container 1 in sequence and shielding grooves of the butted positions 12, preheating the pipe bodies 11, removing the heating strips and the heat preservation layers which are positioned at the butted positions 12 of the pipe bodies 11 after preheating, retaining the heating strips and the heat preservation layers on two sides of the grooves, stopping heating, and then welding. Only remove the heating band and the heat preservation of butt joint position 12 after the preheating treatment, guarantee that welding operation can normally go on, and keep the heating band and the heat preservation of groove both sides to prevent that the heat from giving off too fast, in addition, the heat preservation is not demolishd, only stops the heating, can guarantee that main operator 2 can weld smoothly.
Further, the sole of main operator 2 pastes the heat insulation layer, the heat insulation layer with set up the cooling layer between the sole. Through pasting heat insulation layer and cooling layer at main operator 2's sole, can further prevent heat transfer to main operator 2's sole, promote the security.
For the secondary operator, in order to prevent the temperature inside the secondary operator from being too high, a heat insulation layer and a heat insulation layer need to be arranged on the inner wall of the pipe body 11 adjacent to the groove, and the groove is not shielded by the heat insulation layer and the heat insulation layer.
In addition, before welding the top of the high pressure vessel 1 and the side adjacent to the top, the sub-operator lays thermal insulation blankets, which must cover the finished weld, on the bottom and the side adjacent to the bottom of the high pressure vessel 1.
In the description herein, it is to be understood that the terms "upper" and the like are based on the orientation or positional relationship shown in the drawings, which are for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.
In the description herein, references to the term "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. A welding method for a high-pressure container is characterized by comprising the following steps:
s100, providing a suspension device and a whole-body safety belt, selecting the suspension device according to the weight of a main operator, and enabling the buoyancy of the suspension device to be slightly smaller than the gravity of the main operator;
step S200, fixing the whole body safety belt on the body of the main operator, and then connecting the whole body safety belt with the suspension device, wherein the suspension device is connected with the whole body safety belt through a binding band, and the length of the binding band is not less than 3 m;
step S300, welding the high-pressure container, wherein the bottom and the position, close to the bottom, of the side edge of the high-pressure container are welded firstly during welding, then a ladder is installed on the side edge of the high-pressure container, and a main operator holds a welding gun to climb from the ladder to the top of the high-pressure container to weld the top and the position, close to the top, of the side edge of the high-pressure container;
and S400, after welding is finished, returning the main operator to the ground and then detaching the suspension equipment.
2. The high-pressure vessel welding method according to claim 1, wherein the levitation device is an inflation device that is inflated after the full-body safety belt is fastened to the main operator.
3. The method for welding a high-pressure vessel according to claim 1, wherein the levitation device is an inflation device, and the levitation device is pre-inflated and then connected to the full body harness of the main operator.
4. The high-pressure vessel welding method according to claim 1, further comprising a preparation step of, before welding the high-pressure vessel: and (2) performing gas cutting on a groove at the butt joint end of the pipe body of the high-pressure container, polishing the groove until the metallic luster is exposed, then hoisting the two pipe bodies to be butted to a welding position, and adjusting the position to ensure that the distance between the narrowest positions of the grooves of the two pipe bodies is 3-4 mm.
5. The method for welding a high-pressure vessel according to claim 4, wherein step S300 comprises:
step S310, the main operator performs front welding on the positions, adjacent to the bottom, of the bottom and the side edges of the high-pressure container from the outer side of the high-pressure container, and the auxiliary operator performs back welding on the positions, adjacent to the bottom, of the bottom and the side edges of the high-pressure container from the inner side of the high-pressure container;
step S320, installing the ladder on the side of the high-pressure container, and enabling the welding gun held by the main operator to climb to the top of the high-pressure container from the ladder;
step S330, the main operator performs the front welding on the positions, adjacent to the top, of the top and the sides of the high-pressure container from the outer side of the high-pressure container, and the auxiliary operator performs the back welding on the positions, adjacent to the top, of the top and the sides of the high-pressure container from the inner side of the high-pressure container;
and the tracks of the front welding and the back welding are the same, the back welding is carried out at the same position after the front welding starting time T, and T is more than or equal to 20s and less than or equal to 40 s.
6. The method for welding a high-pressure vessel according to claim 5, wherein the front-side welding includes a back-welding, a fill-welding, and a cover-welding, the back-welding, the fill-welding, and the cover-welding are performed in this order, the start time of the back-side welding is calculated from the start time of the back-welding, and the back-side welding is started after the back-welding operation time T.
7. The method for welding the high-pressure vessel according to claim 1, wherein a preheating treatment is performed before the welding of the high-pressure vessel, the preheating temperature is 100 ℃ to 150 ℃, and then the temperature is maintained for 30min to 60 min.
8. The method for welding a high-pressure vessel according to claim 7, wherein the preheating treatment is specifically: sequentially winding a heating belt and a heat preservation layer on the peripheries of two butted pipe bodies of the high-pressure container and shielding grooves of the butted positions, preheating the pipe bodies, removing the heating belt and the heat preservation layer which are positioned at the butted positions of the pipe bodies after preheating, retaining the heating belt and the heat preservation layer on two sides of the grooves, stopping heating, and then welding.
9. The method for welding a high-pressure vessel according to claim 8, wherein the shoe sole of the main operator is adhered with a heat insulating layer, and a cooling layer is provided between the heat insulating layer and the shoe sole.
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| US20020079303A1 (en) * | 2000-12-26 | 2002-06-27 | Offer Henry P. | Method for large pressure vessel assembly |
| CN101380503A (en) * | 2008-10-31 | 2009-03-11 | 冯世英 | Spiderman automatic escaping apparatus |
| CN101737614B (en) * | 2010-01-19 | 2012-07-04 | 上海市特种设备监督检验技术研究院 | Assembly method of shirt support and spherical shell plate of 1000m<3> nitrogen spherical tank |
| CN102920065B (en) * | 2012-11-14 | 2015-02-04 | 曾建新 | High-altitude rescue costume |
| CN203526814U (en) * | 2013-09-29 | 2014-04-09 | 河海大学常州校区 | Portable temperature-control type ceramic heating band for pipe outdoor welding construction |
| CN104096954A (en) * | 2014-06-26 | 2014-10-15 | 中建一局集团安装工程有限公司 | Double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method |
| CN205660673U (en) * | 2016-06-08 | 2016-10-26 | 国网四川省电力公司自贡供电公司 | Floated electrical tool package |
| CN110902173A (en) * | 2019-11-06 | 2020-03-24 | 中国化学工程第六建设有限公司 | Large thick-wall stainless steel ball tank and assembling and welding method thereof |
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