CN111575475B - Blast furnace shell vertical welding seam heat treatment device and application method thereof - Google Patents
Blast furnace shell vertical welding seam heat treatment device and application method thereofInfo
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- CN111575475B CN111575475B CN202010576777.8A CN202010576777A CN111575475B CN 111575475 B CN111575475 B CN 111575475B CN 202010576777 A CN202010576777 A CN 202010576777A CN 111575475 B CN111575475 B CN 111575475B
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- heat treatment
- weld heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
一种高炉壳体立焊焊缝热处理装置及其使用方法，包括焊缝热处理內模、焊缝热处理外模和连接固定构件，焊缝热处理內模为一竖直使用的长条形开口箱体，焊缝热处理外模为与焊缝热处理內模相对应的长条形开口箱体，连接固定构件设置在內模端板及外模端板的上下两侧，用以将焊缝热处理內模及焊缝热处理外模固定安装在钢制环带的立焊焊缝上。本发明通过在焊缝热处理內模及焊缝热处理外模内铺设保温棉、加热片和在加热片上安装连接热电偶，即可对高炉壳体立焊焊缝实施热处理操作，能有效解决高炉壳体建设现场立焊焊缝热处理时加热块及保温棉的固定夹紧问题，提高工作效率，保温效果好、热损失小，对焊缝、热影响区、母材等均有较好的热处理效果。
A blast furnace shell vertical weld seam heat treatment device and its use method include a weld seam heat treatment inner mold, a weld seam heat treatment outer mold and a connecting and fixing member. The weld seam heat treatment inner mold is a vertically used long strip open box, and the weld seam heat treatment outer mold is a long strip open box corresponding to the weld seam heat treatment inner mold. The connecting and fixing member is arranged on the upper and lower sides of the inner mold end plate and the outer mold end plate, and is used to fix the weld seam heat treatment inner mold and the weld seam heat treatment outer mold on the vertical weld seam of the steel ring belt. The present invention can perform heat treatment operations on the blast furnace shell vertical weld seam by laying insulation cotton and heating plates in the weld seam heat treatment inner mold and the weld seam heat treatment outer mold and installing a connecting thermocouple on the heating plate. It can effectively solve the problem of fixing and clamping the heating block and insulation cotton during the heat treatment of the vertical weld seam at the blast furnace shell construction site, improve work efficiency, have a good insulation effect, and reduce heat loss. It has a good heat treatment effect on the weld seam, heat-affected zone, parent material, etc.
Description
Technical Field
The invention relates to a welding seam heat treatment fixture and a using method thereof, in particular to a vertical welding seam heat treatment device for a blast furnace shell and a using method thereof, belonging to the technical field of welding seam heat treatment equipment and welding seam heat treatment thereof.
Background
The construction of blast furnaces requires first the production of a blast furnace shell, which is usually made up of a stack of shell rings made of a plurality of steel plates.
The steel plate for manufacturing the blast furnace shell is very thick and is generally 45-70 mm.
Modern blast furnace shells are usually huge, if the blast furnace shells are manufactured and built in a production workshop of a manufacturer, the blast furnace shells cannot be safely transported to the site under the existing condition after being manufactured, so that in the prior art, the blast furnace shells are generally manufactured by rolling local steel plates in the production workshop of a manufacturing enterprise, and then transported to a blast furnace building site for welding and assembling, so that the blast furnace shells are built.
Since the blast furnace shell is an extremely important part in the blast furnace and the steel plate of the blast furnace shell is thick, the welding assembly of the blast furnace shell is generally very difficult and the welding quality requirement is very high, especially when the rolled steel plate is subjected to vertical welding and splicing to form an endless belt, the operation is more difficult, the vertical welding quality is more demanding, and generally, after the vertical welding and splicing of the on-site steel plate is finished, all vertical welding seams must be subjected to heat treatment, so that the quality requirement of the blast furnace shell can be met.
In general, the heat treatment of the vertical welding seam of the blast furnace shell adopts a thermocouple heating and heat preservation method of heat preservation cotton.
Because the construction environment of a blast furnace shell construction site is generally poor, thermocouples and heat insulation cotton cannot be simply, conveniently, quickly and stably fixed on the vertical welding seam, and therefore, the heat treatment of the vertical welding seam of the blast furnace shell is very difficult.
In addition, as the construction of the blast furnace shell is advanced, the blast furnace shell is built higher and higher, and the difficulty of corresponding vertical welding and welding seam heat treatment operation is higher and higher, so that the quality is difficult to be ensured.
In the prior art, some related technical schemes and technical documents can be searched for such problems as heat treatment of welding seams, such as:
The utility model provides a heat-insulating and reinforcing device for the interior of a pipeline weld joint heat treatment, which comprises a pressing plate, a connecting clamp, a pressing plate, a connecting sleeve and a short connecting rod, wherein the pressing plate expands outwards to compact heat-insulating cotton in the pipeline, the connecting clamp connects a pressing plate joint, the short connecting rod is connected through the connecting sleeve and is matched with the pressing plate to extrude and fix the pressing plate;
The invention patent (application number: 201410016677.4) provides a heat treatment device and a heat treatment method for a welding line for mounting a steel containment of a nuclear power plant, which mainly comprises a main framework (Z-1), a heating and heat-preserving device (Z-2), a travelling mechanism (Z-3), a temperature sensing device (Z-4) and an automatic temperature controller (Z-5), wherein during heat treatment, the travelling mechanism of the heat treatment device is supported on the upper edge of a containment wallboard, and the travelling mechanism is moved along the upper edge, so that the heating and heat-preserving devices on two sides of the containment wallboard are positioned at positions for clamping welding lines to be heat treated, then the temperature sensor is arranged at the welding lines to be heat treated, and after an electric heater is connected, the welding lines are heated to a preset temperature under the closed-loop control of the automatic temperature controller;
The invention patent (application number: 201610446991.5) provides a method for heat treatment of a girth weld of a steel containment vessel cylinder of a nuclear power station, which comprises the steps of dividing the girth weld into a plurality of sections, cleaning the surface of the girth weld, arranging a temperature thermocouple in a heat treatment area, arranging a temperature control thermocouple on a heating sheet, fixing the heating sheet in the heat treatment area, covering heat preservation cotton on the heating sheet, raising the temperature of the heating sheet to be below the lower limit value of the heat treatment temperature range, leading the temperature values detected by all the temperature thermocouples to be the same and below the lower limit value of the heat treatment temperature range, successively raising the temperature values detected by all the temperature thermocouples to be within the heat treatment temperature range, preserving heat, and cooling after heat preservation is finished;
The invention provides a method for guaranteeing uniformity of heat treatment of a weld joint of a large-diameter thick-wall pipe, which is provided by the patent application (application number: 201810722902.4), and comprises the steps of heating the outer wall of the pipeline at a welding port position and simultaneously heating the pipe cavity of the pipeline at the welding port position, and further heating the inner wall of the pipeline.
Although the above patent technology or patent application literature provides corresponding solutions to the respective problems to be solved, for the heat treatment of the vertical welding seam of the ultra-large and ultra-thick steel plate equipment such as the blast furnace shell, in the process of performing the heat treatment of the vertical welding seam of the blast furnace shell construction site, for the basic problem of how to perform the heat treatment of the vertical welding seam, which is convenient, quick and effective in clamping and fixing of the heating block and the heat insulation cotton, no effective technical scheme and no direct technical suggestion are provided, and the requirements of the heat treatment of the vertical welding seam of the relevant blast furnace shell cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention provides a blast furnace shell vertical welding seam heat treatment device and a use method thereof, and aims to quickly and effectively solve the clamping and fixing problems of a heating block and heat preservation cotton in the blast furnace shell vertical welding seam heat treatment process in a blast furnace shell construction site, provide preconditions and basic conditions for the heat treatment work of the blast furnace shell vertical welding seam in the construction site, ensure the construction quality of the blast furnace shell and improve the construction efficiency.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
The utility model provides a blast furnace casing vertical welding seam heat treatment device, the blast furnace casing is overlapped by steel clitellum and forms, steel clitellum has crooked steel sheet to splice through vertical welding, its characterized in that includes:
The welding seam heat treatment inner die, a welding seam heat treatment outer die which is arranged opposite to the welding seam heat treatment inner die and a connecting and fixing member;
the welding seam heat treatment inner die is a vertically used strip-shaped opening box body and comprises an inner die end plate arranged at the upper end and the lower end of the box body and an inner die side plate and an inner die cover plate or an inner die arc-shaped cover plate which are connected with the two inner die end plates, wherein a through hole is formed in the inner die end plate, and the edge of the opening side of the inner die end plate is in an outwards convex arc shape;
The welding seam heat treatment outer die is a vertically used strip-shaped opening box body and comprises outer die end plates arranged at the upper end and the lower end of the box body, and an outer die side plate and an outer die cover plate or an outer die arc-shaped cover plate which are connected with the two outer die end plates, wherein a through hole is formed in the outer die end plate, and the edge of the opening side of the outer die end plate is in an inward concave arc shape;
The connecting and fixing members are respectively arranged on the upper side and the lower side of the inner die end plate and the outer die end plate and used for fixedly mounting the welding seam heat treatment inner die and the welding seam heat treatment outer die on the steel annular belt.
Further, the inner mold for heat treatment of the welding seam and the inner mold for heat treatment of the welding seam are respectively provided with a plurality of rib plate partitions, and the rib plate partitions are used for enhancing the strength of the cover plate of the inner mold, the cover plate of the outer mold or the circular arc-shaped cover plate of the inner mold and the circular arc-shaped cover plate of the outer mold and dividing the inner spaces of the inner mold for heat treatment of the welding seam and the outer mold for heat treatment of the welding seam.
Further, the lengths of the inner welding seam heat treatment die and the outer welding seam heat treatment die are equal to the length of the steel annular belt vertical welding seam, the widths of the inner welding seam heat treatment die and the outer welding seam heat treatment die are 0.45-0.55 m, and the thicknesses of the inner welding seam heat treatment die and the outer welding seam heat treatment die are 85-90% of the thickness of heat preservation cotton used for vertical welding seam heat treatment of the blast furnace shell.
Further, the connecting and fixing member comprises a hanging piece and a bolt and nut, the hanging piece is provided with a screw hole, the bolt is inserted into the screw hole, and the welding seam heat treatment inner die and the welding seam heat treatment outer die are oppositely connected and fixed between the inner side and the outer side of the steel ring belt through the nut.
Furthermore, the hanging piece is made of angle steel.
Further, the welding seam heat treatment inner die and the welding seam heat treatment outer die are manufactured by adopting a 5mm steel plate.
Further, the application method of the blast furnace shell vertical welding seam heat treatment device is characterized by comprising the following steps of:
s10) paving heat preservation cotton in the inner welding seam heat treatment die and the outer welding seam heat treatment die respectively;
S20) respectively paving heating plates on the heat-insulating cotton of the welding seam heat-insulating inner die and the heat-insulating cotton of the welding seam heat-insulating outer die, and installing and connecting thermocouples on the heating plates, wherein cables connected with the thermocouples respectively penetrate through holes in the inner die end plate and the outer die end plate and are connected with an external power supply;
S30) respectively attaching the inner die for heat treatment of the welding seam and the outer die for heat treatment of the welding seam to the inner side and the outer side of the vertical welding seam of the steel ring belt;
S40) respectively connecting and fixing the welding seam heat treatment inner die and the welding seam heat treatment outer die between the inner side and the outer side of the steel annular band through the connecting and fixing member, and then performing heat treatment operation on the vertical welding seam of the blast furnace shell.
Further, the heat-insulating cotton is aluminum silicate cotton.
Compared with the prior art, the embodiment of the invention has the beneficial effects and remarkable progress that:
1) According to the vertical welding seam heat treatment device for the blast furnace shell and the application method thereof, provided by the embodiment of the invention, the vertical welding seam heat treatment device for the blast furnace shell is constructed by a vertically used strip-shaped welding seam heat treatment inner die, a welding seam heat treatment outer die which is arranged opposite to the welding seam heat treatment inner die, and a connecting and fixing member, and the vertical welding seam heat treatment device for the blast furnace shell can be implemented by paving heat-insulating cotton and a heating plate in the welding seam heat treatment inner die and the welding seam heat treatment outer die respectively and installing a connecting thermocouple on the heating plate;
2) The heat treatment device for the vertical welding seam of the blast furnace shell and the use method thereof provided by the embodiment of the invention can effectively solve the problem that a heating block and heat preservation cotton cannot be effectively fixed and clamped by adopting a common method when the vertical welding seam of the blast furnace shell is subjected to heat treatment on the construction site, can improve the working efficiency, save the preparation time of a large amount of heat treatment operation and the loss of heat preservation materials, and have good heat preservation effect, small heat loss and good heat treatment effect on welding seams, heat affected zones, base materials and the like;
3) The vertical welding seam heat treatment device for the blast furnace shell provided by the embodiment of the invention has the advantages of simplicity and convenience in manufacture, low price, strong applicability, repeated use for a plurality of times, simple and convenient use method and reliable effect, provides preconditions and basic conditions for vertical welding seam heat treatment of the blast furnace shell on a construction site, improves the working efficiency, ensures the construction quality of the blast furnace shell, and has very wide market application prospect, thus having popularization and application values.
Drawings
In order to more clearly illustrate the technical solution of the present invention, a brief description will be given below of the drawings that are required to be used for the embodiments of the present invention.
Obviously:
The drawings described below are only illustrative of some of the embodiments of the present invention and other drawings may be made by those skilled in the art without the benefit of the inventive faculty, and are intended to fall within the scope of the invention as defined by the claims.
Fig. 1 is a schematic diagram of a blast furnace shell structure, which is aimed at by a blast furnace shell vertical welding seam heat treatment device and a using method thereof;
Fig. 2 is a schematic perspective view of a heat treatment device for vertical welding seam of blast furnace shell, which includes a side plate and a cover plate;
fig. 3 is a schematic perspective view of a heat treatment device for vertical welding seams of a blast furnace shell, which is provided by the embodiment of the invention, wherein the heat treatment device comprises a circular arc-shaped cover plate;
FIG. 4 is a schematic block diagram of a use process of a blast furnace shell vertical welding seam heat treatment device provided by an embodiment of the invention;
fig. 5 is a schematic top view of a use process of a heat treatment device for vertical welding seams of a blast furnace shell according to an embodiment of the present invention.
In the figure:
10-steel endless belt, 11-steel plate and 12-vertical welding seam;
A welding seam heat treatment inner die, a 21 inner die end plate, a 22 inner die side plate, the inner die cover plate is 23-and the circular arc cover plate of the inner die is 24-;
30-heat treatment of an outer die by welding seams, 31-an outer die end plate, 32-an outer die side plate, 33-an outer die cover plate and 34-an outer die arc cover plate;
40-connecting the fixing member;
50-rib plate partition;
61-heat preservation cotton, 62-heating plates and 63-thermocouples.
Detailed Description
In order to make the objects, technical solutions, advantageous effects and significant improvements of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings provided in the embodiments of the present invention, and it is apparent that all of the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments of the present invention are within the scope of protection of the present invention.
It should be noted that:
The terms "first," "second," and the like in the description and in the claims, and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and furthermore, the term "comprises" and any variation thereof, is intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may, optionally, also include other steps or elements not listed or inherent to such process, method, article, or apparatus.
It is to be understood that:
In the description of the embodiments of the present invention, some directional orientation or positional terms are used merely for convenience of describing the embodiments of the present invention and to simplify the description, rather than to indicate or imply that the apparatus or elements described must have a particular orientation, a particular orientation configuration, and operation, and thus should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, removably attached or removably attached, or integrally formed, or may be directly attached, indirectly via an intermediate medium, or may be in communication with one another or in an interaction relationship between two elements, unless explicitly specified otherwise.
The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Also to be described is:
the following specific embodiments may be combined with each other and may not be described in detail in some embodiments for the same or similar concepts or processes therein.
The following describes the technical scheme of the present invention in detail by using specific examples.
Examples
The blast furnace shell vertical welding seam heat treatment device and the using method thereof provided by the embodiment of the invention as shown in fig. 1 are as follows:
The blast furnace shell provided by the embodiment and the application method thereof are formed by superposing steel endless belts 10, wherein the steel endless belts 10 are formed by splicing bent steel plates 11 through vertical welding, and the vertical welding seam 12 is arranged between the two bent steel plates 11, and is usually double-sided welding.
As shown in a schematic perspective view of a side plate and a cover plate included in a heat treatment device for a vertical welding seam of a blast furnace shell provided in the embodiment of the present invention in fig. 2, and a schematic perspective view of a circular arc-shaped cover plate included in the heat treatment device for a vertical welding seam of a blast furnace shell provided in the embodiment of the present invention in fig. 3, the heat treatment device is shown in the schematic perspective view of the structure:
A blast furnace shell stud weld heat treatment apparatus comprising:
A bead heat-treated inner die 20, a bead heat-treated outer die 30 set up opposite to the bead heat-treated inner die 20, and a connection fixing member 40;
the welding seam heat treatment inner die 20 is a vertically used strip-shaped opening box body and comprises inner die end plates 21 arranged at the upper end and the lower end of the box body, an inner die side plate 22 and an inner die cover plate 23 or an inner die arc-shaped cover plate 24 which are connected with the two inner die end plates 21, the inner die end plates 21 are provided with through holes, and the edges of the opening sides of the inner die end plates 21 are outwards convex arcs;
The welding seam heat treatment outer die 30 is a vertically used strip-shaped open box body and comprises an outer die end plate 31 arranged at the upper end and the lower end of the box body, an outer die side plate 32 for connecting the two outer die end plates, an outer die cover plate 33 or an outer die arc-shaped cover plate 34, a through hole is formed in the outer die end plate 31, and the edge of the open side of the outer die end plate 31 is in a concave arc shape;
the connecting and fixing members 40 are respectively provided at the upper and lower sides of the inner mold end plate 21 and the outer mold end plate 31 for fixedly mounting the weld heat-treated inner mold 20 and the weld heat-treated outer mold 30 on the steel endless belt 10.
Further, as a preferable technical scheme, a plurality of rib plate partitions 50 are further arranged in the weld heat treatment inner die 20 and the weld heat treatment outer die 30 respectively, and the rib plate partitions 50 are used for enhancing the strength of the inner die cover plate 23 and the outer die cover plate 33 or the inner die arc-shaped cover plate 24 and the outer die arc-shaped cover plate 34 or dividing the inner space of the weld heat treatment inner die 20 and the weld heat treatment outer die 30.
Further, the lengths of the welding seam heat treatment inner die 20 and the welding seam heat treatment outer die 30 are equal to the length of the vertical welding seam 12 of the steel ring belt 10, the widths of the welding seam heat treatment inner die 20 and the welding seam heat treatment outer die 30 are 0.45-0.55 m, and the thicknesses of the welding seam heat treatment inner die 20 and the welding seam heat treatment outer die 30 are 85-90% of the thickness of heat preservation cotton used for vertical welding seam heat treatment of the blast furnace shell.
Further, in this embodiment, the connection fixing member 40 may include a hanging member and a bolt and nut, where the hanging member is provided with a screw hole, and the bolt is inserted into the screw hole and connects and fixes the inner mold for heat treatment of the weld seam and the outer mold for heat treatment of the weld seam between the inner side and the outer side of the steel endless belt by the nut.
Furthermore, in this embodiment, the hanging member may be made of angle steel.
Further, in this embodiment, the inner mold 20 and the outer mold 30 may be made of 5mm steel plate.
As shown in a schematic block diagram of a use process of the vertical welding seam heat treatment device for a blast furnace shell provided by the embodiment of the invention in fig. 4, fig. 5 is a schematic top view structure diagram of a use process of the vertical welding seam heat treatment device for a blast furnace shell provided by the embodiment of the invention, wherein the schematic top view structure diagram is as follows:
the application method of the blast furnace shell vertical welding seam heat treatment device comprises the following steps:
s10), paving heat preservation cotton 60 in the inner welding seam heat treatment die 20 and the outer welding seam heat treatment die 30 respectively;
S20), respectively paving heating plates 70 on the heat-insulating cotton 60 of the welding seam heat-treating inner die 20 paved with the heat-insulating cotton 60 and the welding seam heat-treating outer die 30, installing connection thermocouples 80 on the heating plates 70, and respectively penetrating cables (not shown in the figure) connected with the thermocouples 80 from through holes on the inner die end plate 21 and the outer die end plate 31 to be connected with an external power supply;
s30) respectively attaching the welding seam heat treatment inner die 20 and the welding seam heat treatment outer die 30 to the inner side and the outer side of the vertical welding seam 12 of the steel ring belt 10;
s40) respectively connecting and fixing the welding seam heat treatment inner die 20 and the welding seam heat treatment outer die 30 between the inner side and the outer side of the steel ring belt 10 through the connecting and fixing member 40, so that the heat treatment operation can be carried out on the vertical welding seam of the blast furnace shell.
Further, in this embodiment, the insulation cotton 60 may be aluminum silicate cotton.
From the above description, it can be seen that:
Firstly, the blast furnace shell vertical welding seam heat treatment device and the application method thereof are constructed by a vertically used strip-shaped welding seam heat treatment inner die, a welding seam heat treatment outer die which is arranged opposite to the welding seam heat treatment inner die and a connecting and fixing member, and the blast furnace shell vertical welding seam heat treatment device is constructed by oppositely connecting and fixing the inner side and the outer side of a steel ring belt of the blast furnace shell, and heat treatment operation can be implemented on the blast furnace shell vertical welding seam by paving heat preservation cotton and a heating plate in the welding seam heat treatment inner die and the welding seam heat treatment outer die respectively and installing a connecting thermocouple on the heating plate;
Secondly, the heat treatment device for the vertical welding seam of the blast furnace shell and the use method thereof can effectively solve the problem that a heating block and heat preservation cotton cannot be effectively fixed and clamped by a common method when the vertical welding seam of the blast furnace shell is subjected to heat treatment on the construction site, can improve the working efficiency, save the preparation time of a large amount of heat treatment operation and the loss of heat preservation materials, and have good heat preservation effect, small heat loss and good heat treatment effect on welding seams, heat affected zones, base materials and the like.
From the above, it can be seen that:
The vertical welding seam heat treatment device for the blast furnace shell provided by the embodiment of the invention has the advantages of simplicity and convenience in manufacture, low price, strong applicability, repeated use for a plurality of times, simple and convenient use method and reliable effect, provides preconditions and basic conditions for vertical welding seam heat treatment of the blast furnace shell on a construction site, improves the working efficiency, ensures the construction quality of the blast furnace shell, and has very wide market application prospect, thus having popularization and application values.
In the description of the above specification:
The terms "present embodiment," as illustrated, "further," and the like, mean that a particular feature, structure, material, or characteristic described in the embodiment or example is included in at least one embodiment or example of the present invention;
in this specification, the schematic representations of the above terms are not necessarily for the same embodiment or example, and the specific features, structures, materials, or characteristics, etc. described may be combined or combined in any one or more embodiments or examples in a suitable manner, and furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined or combined by one of ordinary skill in the art without contradiction.
Finally, it should be noted that:
the above embodiments are only for illustrating the technical solution of the present invention, not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified, or equivalent substitutions for some or all of the features, without departing from the scope of the embodiments of the present invention, and the technical field will not be limited to the essential modifications, the modifications and the substitutions.
Claims (6)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103769727A (en) * | 2014-01-14 | 2014-05-07 | 中国核工业华兴建设有限公司 | Automatic welding method of nuclear plant steel safety shell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103769727A (en) * | 2014-01-14 | 2014-05-07 | 中国核工业华兴建设有限公司 | Automatic welding method of nuclear plant steel safety shell |
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