CN113977037A - Single-side welding and double-side forming method for T-shaped joint of closed supporting structure - Google Patents
Single-side welding and double-side forming method for T-shaped joint of closed supporting structure Download PDFInfo
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- CN113977037A CN113977037A CN202111485256.2A CN202111485256A CN113977037A CN 113977037 A CN113977037 A CN 113977037A CN 202111485256 A CN202111485256 A CN 202111485256A CN 113977037 A CN113977037 A CN 113977037A
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- welding
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- closed supporting
- shaped
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- 238000003466 welding Methods 0.000 title claims abstract description 254
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims description 9
- 229910000679 solder Inorganic materials 0.000 claims description 7
- 230000035515 penetration Effects 0.000 abstract description 6
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007778 shielded metal arc welding Methods 0.000 description 1
Images
Classifications
-
- 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
- B23K9/00—Arc welding or cutting
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
A closed supporting structure T-shaped joint single-side welding double-side forming method comprises the steps of processing a welding groove of a closed supporting structure, assembling the closed supporting structure and a bottom plate, enabling a gap to exist between the welding groove of the closed supporting structure and the bottom plate, and welding a closed annular welding area between the closed supporting structure and the bottom plate by adopting a welding mode combining symmetric welding and skip welding and a welding method of manual electric arc welding. The invention reasonably designs the groove form and the size of the closed supporting structure, the heat dissipation condition of the blunt edge thickness of the adopted V-shaped groove form is superior to that of the U-shaped groove, and the welding penetration can be effectively prevented.
Description
Technical Field
The invention relates to a single-side welding and double-side forming method for a T-shaped joint of a closed supporting structure.
Background
In the field of pressure vessels, for example, T-shaped joints exist in supporting structural members of nuclear power main equipment, and due to the reasons of structural closure and the like, the T-shaped joints cannot be back-gouged after welding is completed, so that single-side welding and double-side forming are required to be realized. In order to realize the single-side welding and double-side forming of the welding seam root and ensure the penetration quality of the welding seam root, the assembly precision such as the misalignment amount and the assembly clearance must be controlled. Some T-shaped joint grooves in the existing supporting structural member are in the form shown in figure 1, the welding method comprising the upper plate groove and the bottom plate groove is argon tungsten-arc welding, but the requirement on the assembly precision is high, particularly, the misalignment between the upper plate groove and the bottom plate groove needs to be controlled within 2mm, some supporting structures (such as supporting rings) shown in figure 2 are formed by rolling plates, the ovality of the supporting structures has some deviations, the misalignment can not be accurately controlled during assembly, and the forming quality of the back of a welding seam can not be guaranteed by adopting argon tungsten-arc welding at the moment.
Disclosure of Invention
The invention aims to provide a method for forming a T-shaped joint with a closed supporting structure on one side and two sides by welding, which can reduce the requirement on assembly precision and sensitivity to misalignment, effectively realize the one-side welding and two-side forming of the T-shaped joint, ensure the penetration of the back of a root part and simultaneously avoid the defects of root part penetration or undercut and the like.
In order to achieve the purpose, the invention provides a single-side welding and double-side forming method of a T-shaped joint of a closed supporting structure, which comprises the following steps:
step S1, processing a welding groove of the closed supporting structure;
step S2, assembling the closed supporting structure and the bottom plate, and enabling an assembling gap to exist between the welding groove of the closed supporting structure and the bottom plate;
and step S3, welding the closed annular welding area between the closed supporting structure and the bottom plate by adopting a welding mode of combining symmetrical welding and skip welding and a welding method of manual arc welding.
The welding groove of the closed supporting structure is V-shaped, and the appearance of the welding groove is formed by sequentially connecting a side edge, a truncated edge, a first bevel edge and a second bevel edge.
The truncated edge is parallel to the welding surface of the bottom plate, and the length of the truncated edge is 0.5-1.5 mm.
The angle between the first bevel edge and the welding surface of the bottom plate is 60-65 degrees, and the distance between the connecting point of the first bevel edge and the second bevel edge and the blunt edge is 9-9.5 mm.
The angle between the second bevel edge and the welding surface of the bottom plate is 25-30 degrees.
And the assembly gap between the welding groove of the closed supporting structure and the welding surface of the bottom plate is 3-4 mm.
The welding mode that symmetry welding and jump welding combine together includes: equally dividing the closed annular welding area into an even number of fan-shaped areas, wherein any two fan-shaped areas which are in mirror symmetry with the diameter of the closed annular welding area as a symmetry axis form a group of welding groups, firstly selecting any one group of welding groups for welding, then sequentially selecting one group of unwelded welding groups which are farthest away from the fan-shaped areas in the welded welding groups for welding until only one unwelded fan-shaped area is separated between the fan-shaped areas of all the welded groups, and finally sequentially selecting the rest groups of unwelded welding groups for welding.
The welding method of manual arc welding comprises the following steps:
step S301, performing backing welding, wherein the thickness of the solder reaches 5-10 mm;
and step S302, performing filling welding and cover surface welding until the second bevel edge on the welding groove of the closed supporting structure is completely covered by the solder.
The backing welding adopts a welding rod with the diameter of 3.2 mm; when the welding position is flat welding, the welding current is 100-130A, the welding voltage is 25-28V, and the welding speed is 60-100 mm/min; when the welding position is vertical welding, the welding current is 110-130A, the welding voltage is 25-28V, and the welding speed is 40-80 mm/min.
The welding positions of the filling welding and the cover surface welding adopt flat welding or vertical welding; when a welding rod with the diameter of 3.2mm is adopted as a welding material, the welding current is 100-130A, the welding voltage is 25-28V, and the welding speed is 70-180 mm/min; when the welding material adopts a welding rod with the diameter of 4.0mm, the welding current is 130A-180A, the welding voltage is 25V-28V, and the welding speed is 80-200 mm/min; when the welding material adopts a welding rod with the diameter of 5.0mm, the welding current is 180A-240A, the welding voltage is 25V-28V, and the welding speed is 100-200 mm/min.
The invention reasonably designs the groove form and the size of the closed supporting structure, the heat dissipation condition of the blunt edge thickness of the adopted V-shaped groove form is superior to that of the U-shaped groove, and the welding penetration can be effectively prevented.
Drawings
FIG. 1 is a schematic diagram of a groove of a T-joint in the prior art.
FIG. 2 is a schematic diagram of the beveling of a T-joint in the prior art.
FIG. 3 is a schematic view of a welding groove of the enclosed support structure in an embodiment of the invention.
Fig. 4 is a schematic view of the welding position of the closed support structure and the bottom plate in the embodiment of the invention.
FIG. 5 is a schematic illustration of a symmetrical weld and skip weld of a closed loop weld area in an embodiment of the present invention.
FIG. 6 is a schematic view of a closed loop weld zone for manual arc welding in an embodiment of the present invention.
Detailed Description
The preferred embodiment of the present invention will be described in detail below with reference to fig. 3 to 6.
Aiming at the T-shaped joint with the back surface incapable of back chipping and the misalignment amount incapable of being guaranteed within 2mm, the invention can reduce the assembly precision requirement and the sensitivity to misalignment by reasonably designing the groove form and the size, controlling the assembly gap and optimizing the welding process, and effectively realizes the single-side welding and double-side molding of the T-shaped joint of the closed supporting structure.
In one embodiment of the present invention, a method for forming a closed support structure T-shaped joint on both sides by single-side welding is provided, which specifically comprises the following steps:
step S1, processing a welding groove of the closed supporting structure;
in the invention, the bottom plate side is not required to be provided with a groove, and only the closed supporting structure side is provided with a welding groove;
as shown in fig. 3 and 4, in this embodiment, taking a horizontal support ring as an example, a welding groove 11 is formed in the bottom of the horizontal support ring 1, the welding groove 11 is V-shaped, the outer shape of the welding groove 11 is formed by sequentially connecting a side edge 101, a blunt edge 102, a first oblique edge 103 and a second oblique edge 104, the side edge 101 is an inner side wall of the horizontal support ring 1, the blunt edge 102 is parallel to a welding surface of a bottom plate 2, the length D1 of the blunt edge 102 is 0.5mm to 1.5mm, an angle β between the first oblique edge 103 and the welding surface of the bottom plate 2 is 60 ° to 65 °, a distance H between a connection point of the first oblique edge 103 and the second oblique edge 104 and the blunt edge 102 is 9mm to 9.5mm, and an angle α between the second oblique edge 104 and the welding surface of the bottom plate 2 is 25 ° to 30 °. The angle of the bottom of the welding groove 11 on the first oblique side is large, the width of the groove on the bottom is guaranteed, welding is facilitated, welding quality is guaranteed, meanwhile, the angle on the second oblique side is small, the groove is prevented from being too wide, filling metal is reduced, and deformation is controlled.
Step S2, assembling the closed supporting structure and the bottom plate;
as shown in fig. 4, in the present embodiment, the bottom plate 2 and the horizontal support ring 1 are assembled by using a tool, and the distance D2 between the truncated edge 102 of the groove 11 of the horizontal support ring 1 and the welding surface of the bottom plate 2 is ensured to be 3mm to 4mm, and since the groove is not provided on the welding surface of the bottom plate 2, no misalignment occurs between the bottom plate 2 and the horizontal support ring 1.
Step S3, welding a closed annular welding area by adopting a welding mode of combining symmetrical welding and skip welding and a welding method of manual arc welding (SMAW);
the welding mode combining the symmetrical welding and the skip welding is as follows: equally dividing the closed annular welding area into an even number of fan-shaped areas, wherein any two fan-shaped areas which are in mirror symmetry with the diameter of the closed annular welding area as a symmetry axis form a group of welding groups, firstly selecting any one group of welding groups for welding, then sequentially selecting one group of unwelded welding groups which are farthest away from the fan-shaped areas in the welded welding groups for welding until only one unwelded fan-shaped area is separated between the fan-shaped areas of all the welded groups, and finally sequentially selecting the rest groups of unwelded welding groups for welding.
As shown in fig. 5, in an embodiment of the present invention, the closed annular welding area is divided into eight areas 1-8 equally, the symmetric areas are 1 and 5, 2 and 6, 3 and 7, 4 and 8, and the welding is performed by combining symmetric welding and skip welding to control the welding deformation, that is, the welding sequence is: [1 and 5] → [3 and 7] → [2 and 6] → [4 and 8 ].
As shown in fig. 6, the welding method of manual arc welding includes:
step S301, performing backing welding, wherein the thickness of the solder reaches 5-10 mm, and the solder completely covers the truncated edge 102 on the welding groove 11 of the closed supporting structure and partially covers the first bevel edge 103; in the embodiment, a small-size welding rod with the diameter of 3.2mm is adopted for backing welding, when the welding position is flat welding, the welding current is 100A-130A, the welding voltage is 25V-28V, and the welding speed is 60-100 mm/min, when the welding position is vertical welding, the welding current is 110A-130A, the welding voltage is 25V-28V, and the welding speed is 40-80 mm/min;
step S302, performing filling welding and cover surface welding until the second bevel edge 104 on the welding groove 11 of the closed supporting structure is completely covered by the solder; in the embodiment, the welding position of the filling welding and the capping welding adopts the flat welding or the vertical welding, when the welding rod with the diameter of 3.2mm is adopted as the welding material, the welding current is 100A-130A, the welding voltage is 25V-28V, and the welding speed is 70-180 mm/min, when the welding rod with the diameter of 4.0mm is adopted as the welding material, the welding current is 130A-180A, the welding voltage is 25V-28V, and the welding speed is 80-200 mm/min, when the welding rod with the diameter of 5.0mm is adopted as the welding material, the welding current is 180A-240A, the welding voltage is 25V-28V, and the welding speed is 100-200 mm/min.
The invention reasonably designs the groove form and the size of the closed supporting structure, the heat dissipation condition of the blunt edge thickness of the adopted V-shaped groove form is superior to that of the U-shaped groove, and the welding penetration can be effectively prevented.
It should be noted that, in the embodiments of the present invention, 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. indicate the orientation or positional relationship shown in the drawings, and are only for convenience of describing the embodiments, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; 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 by those skilled in the art according to specific situations.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A single-side welding and double-side forming method for a T-shaped joint of a closed supporting structure is characterized by comprising the following steps:
step S1, processing a welding groove of the closed supporting structure;
step S2, assembling the closed supporting structure and the bottom plate, and enabling an assembling gap to exist between the welding groove of the closed supporting structure and the bottom plate;
and step S3, welding the closed annular welding area between the closed supporting structure and the bottom plate by adopting a welding mode of combining symmetrical welding and skip welding and a welding method of manual arc welding.
2. The single-side welding and double-side forming method for the T-shaped joint of the closed supporting structure according to claim 1, wherein the welding groove of the closed supporting structure is V-shaped, and the shape of the welding groove is formed by sequentially connecting a side edge, a blunt edge, a first bevel edge and a second bevel edge.
3. A method of forming a T-joint on a single face and a double face of a closed support structure according to claim 2, wherein the truncated edge is parallel to the face of the bottom plate, and the length of the truncated edge is 0.5mm to 1.5 mm.
4. A single-side welding and double-side forming method for a T-joint of a closed supporting structure as claimed in claim 2, wherein the angle between the first oblique side and the welding surface of the base plate is 60 ° to 65 °, and the distance between the connecting point of the first oblique side and the second oblique side and the blunt side is 9mm to 9.5 mm.
5. A method of one-sided welding and two-sided forming of a T-joint for a closed support structure according to claim 2, wherein the angle between the second oblique side and the welding face of the base plate is 25 ° to 30 °.
6. The single-side welding and double-side forming method for the T-shaped joint of the closed supporting structure according to claim 1, wherein the assembly gap between the welding groove of the closed supporting structure and the welding surface of the bottom plate is 3-4 mm.
7. A method for forming a T-joint on both sides of a closed supporting structure by one-sided welding according to claim 1, wherein the welding method combining the symmetrical welding and the skip welding comprises: equally dividing the closed annular welding area into an even number of fan-shaped areas, wherein any two fan-shaped areas which are in mirror symmetry with the diameter of the closed annular welding area as a symmetry axis form a group of welding groups, firstly selecting any one group of welding groups for welding, then sequentially selecting one group of unwelded welding groups which are farthest away from the fan-shaped areas in the welded welding groups for welding until only one unwelded fan-shaped area is separated between the fan-shaped areas of all the welded groups, and finally sequentially selecting the rest groups of unwelded welding groups for welding.
8. A single-side welding and double-side forming method for T-shaped joints of a closed supporting structure according to claim 1, wherein the welding method of manual arc welding comprises the following steps:
step S301, performing backing welding, wherein the thickness of the solder reaches 5-10 mm;
and step S302, performing filling welding and cover surface welding until the second bevel edge on the welding groove of the closed supporting structure is completely covered by the solder.
9. A single-side welding and double-side forming method for T-shaped joint of closed supporting structure as claimed in claim 8, characterized in that the backing welding uses a welding rod with a diameter of 3.2 mm; when the welding position is flat welding, the welding current is 100-130A, the welding voltage is 25-28V, and the welding speed is 60-100 mm/min; when the welding position is vertical welding, the welding current is 110-130A, the welding voltage is 25-28V, and the welding speed is 40-80 mm/min.
10. A closed supporting structure T-shaped joint single-side welding double-side forming method as claimed in claim 8, characterized in that the welding positions of filling welding and cover welding adopt flat welding or vertical welding; when a welding rod with the diameter of 3.2mm is adopted as a welding material, the welding current is 100-130A, the welding voltage is 25-28V, and the welding speed is 70-180 mm/min; when the welding material adopts a welding rod with the diameter of 4.0mm, the welding current is 130A-180A, the welding voltage is 25V-28V, and the welding speed is 80-200 mm/min; when the welding material adopts a welding rod with the diameter of 5.0mm, the welding current is 180A-240A, the welding voltage is 25V-28V, and the welding speed is 100-200 mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111485256.2A CN113977037A (en) | 2021-12-07 | 2021-12-07 | Single-side welding and double-side forming method for T-shaped joint of closed supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111485256.2A CN113977037A (en) | 2021-12-07 | 2021-12-07 | Single-side welding and double-side forming method for T-shaped joint of closed supporting structure |
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|---|---|---|---|---|
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| CN111805107A (en) * | 2019-04-11 | 2020-10-23 | 上海海立电器有限公司 | Compressor and method |
| CN113732553A (en) * | 2020-05-27 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon micro-alloy steel high-heat input weldability evaluation method based on twin-wire submerged arc welding |
-
2021
- 2021-12-07 CN CN202111485256.2A patent/CN113977037A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013136065A (en) * | 2011-12-28 | 2013-07-11 | Jfe Steel Corp | Groove part for corner welding of welded tetrahedral box section member |
| CN103252563A (en) * | 2013-05-24 | 2013-08-21 | 东方电气集团东方锅炉股份有限公司 | T-type joint single-side-welding double-side-forming groove machining technology method |
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Application publication date: 20220128 |
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