CN112589333A - Dissimilar steel welded joint - Google Patents
Dissimilar steel welded joint Download PDFInfo
- Publication number
- CN112589333A CN112589333A CN202011330472.5A CN202011330472A CN112589333A CN 112589333 A CN112589333 A CN 112589333A CN 202011330472 A CN202011330472 A CN 202011330472A CN 112589333 A CN112589333 A CN 112589333A
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- CN
- China
- Prior art keywords
- austenite
- ferrite
- dissimilar steel
- oxidation
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000003466 welding Methods 0.000 claims abstract description 31
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 19
- 238000005269 aluminizing Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 21
- 230000003647 oxidation Effects 0.000 abstract description 21
- 238000007254 oxidation reaction Methods 0.000 abstract description 21
- 230000004927 fusion Effects 0.000 abstract description 17
- 239000010953 base metal Substances 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000004584 weight gain Effects 0.000 description 3
- 235000019786 weight gain Nutrition 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000463 material Substances 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
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
-
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention belongs to the technical field of welding processes, and particularly relates to a dissimilar steel welding joint which comprises ferrite and austenite, wherein the groove angle of a welding seam between the ferrite and the austenite is 30 degrees, and the inner wall and the outer wall of the welding seam part of the ferrite and the austenite and the extension part of the welding seam part of the ferrite and the austenite are treated by an aluminizing process. The invention reduces the strain of the fusion line part at the side of the low alloy steel base metal of the service welding joint, improves the oxidation resistance of the dissimilar steel welding joint and weakens the oxidation action and the strain action. In addition, the invention effectively separates the interaction of oxidation and strain, thereby avoiding the generation of an oxidation gap at the low alloy steel side fusion line part of the dissimilar steel welding joint, greatly reducing the failure probability of the dissimilar steel welding joint and effectively preventing the early cracking of the dissimilar steel welding joint.
Description
Technical Field
The invention belongs to the technical field of welding processes, and particularly relates to a dissimilar steel welding joint.
Background
In recent years, as power station boilers enter supercritical and ultra-supercritical times, more and more ferrite/austenite dissimilar steel welded joints of high-temperature parts of the boilers are generated, and early failure accidents that the dissimilar steel joints are shorter than the design life are generated for many times at home and abroad, so that the whole unit is forced to stop and huge economic loss is caused. The early failure of the dissimilar steel joint has the problems of large time span, difficult detection of the conventional flaw detection method and the like, so that supervision countermeasures are difficult to make. As shown in fig. 1, through deep analysis and research on dissimilar steel joints of different operating parameters, different failure times and different materials of a plurality of units, the fracture positions of the dissimilar steel joints with early failure are all positioned at the interface of a fusion line, and the dissimilar steel joints with early failure originate from oxidation sharp notches at the fusion line part on the side of ferritic steel (low alloy steel) and occur on the inner wall and the outer wall. Further, as shown in fig. 2, a large strain is present in the low alloy steel side weld line portion due to the structure of the dissimilar steel joint. The interaction of oxidation and creep strain in the service process of the low alloy steel base metal side weld line part accelerates the early failure of the dissimilar steel pipe welding joint. In order to prevent the occurrence of early failure of the dissimilar steel joint, the dissimilar steel welding joint is designed.
Disclosure of Invention
The invention provides a dissimilar steel welded joint, and aims to prevent the occurrence of early failure of the dissimilar steel joint.
In order to achieve the purpose, the invention adopts the technical scheme that:
a dissimilar steel welded joint comprises ferrite and austenite, and the included angle of a weld between the ferrite and the austenite is 30 degrees.
Further, the welding seam of ferrite and austenite and the inner wall and the outer wall of the extending part of the welding seam are both processed by an aluminizing process.
Compared with the prior art, the invention has the following beneficial effects:
the dissimilar steel welding joint provided by the invention comprises ferrite and austenite, wherein the groove angle of a welding seam between the ferrite and the austenite is 30 degrees, and the inner wall, the outer wall and the welding seam part of the ferrite and the austenite are subjected to aluminizing treatment. Through finite element stress analysis, when the groove angle is 30 degrees, the creep strain of the side fusion line part of the low alloy steel base metal of the dissimilar steel joint is reduced, so that the creep strain of the side fusion line part of the low alloy steel base metal is reduced. The inner and outer walls of the ferrite and austenite welding line and the extending part thereof are treated by aluminizing, so that the oxidation resistance of the low alloy steel side fusion line part of the dissimilar steel welding joint can be well improved, an oxidation notch is prevented from being generated in the running process of the low alloy steel side fusion line part of the joint, and the cracking factor of the low alloy steel side fusion line part is reduced.
Two main factors causing the failure of the dissimilar steel welding joint occur at the position of a fusion line at the side of the base metal of the low alloy steel. The invention reduces the strain of the side fusion line of the low alloy steel base metal, improves the oxidation resistance of the inner wall and the outer wall of the dissimilar steel welded joint pipe, and weakens the oxidation action and the strain action. In addition, the interaction of oxidation and strain is separated through the method, so that an oxidation gap is effectively prevented from being generated at a low alloy steel side fusion line part of the dissimilar steel welding joint, the failure probability of the dissimilar steel welding joint can be greatly reduced, and the early cracking of the dissimilar steel joint is effectively prevented.
Drawings
FIG. 1 is a schematic view of an oxidation notch at a side weld line of a low alloy steel for a dissimilar steel joint according to the prior art;
FIG. 2 is a schematic view of the back scattering analysis of the low alloy steel side weld line portion of the dissimilar steel welded joint;
FIG. 3 is a schematic diagram of the bevel angle of a dissimilar steel welded joint;
FIG. 4 is a schematic diagram of an aluminized structure of a dissimilar steel welded joint.
Wherein: 1-ferrite; 2-austenite; 3-aluminizing layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
As shown in fig. 3, a welded joint of dissimilar steels includes ferrite and austenite, and an included angle of a weld between the ferrite and the austenite is 30 °.
The groove angle of the conventional dissimilar steel welding joint is about 45 degrees, and by finite element stress analysis, when the groove angle is 30 degrees, the creep strain of the low alloy steel base metal side fusion line part of the dissimilar steel joint is reduced, so that the creep strain of the low alloy steel base metal side fusion line part is reduced.
As shown in fig. 4, both the inner and outer walls of the ferrite and austenite welds and their extended portions were subjected to an aluminizing process.
The test proves that the oxidation weight gain of the low alloy steel parent metal after being oxidized for 3000 hours reaches 17mg/cm2And the oxidation weight gain after 3000 hours of oxidation is only 0.1mg/cm after aluminizing2The oxidation resistance is improved by about 170 times. The oxidation weight gain of the aluminized layer is not obviously increased after 6500 hours of oxidation, and cracking and peeling of the aluminized layer are not generated. Therefore, the aluminizing treatment can well improve the oxidation resistance of the low alloy steel side fusion line part of the joint part, avoid the oxidation notch of the low alloy steel side fusion line part of the dissimilar steel welding joint during operation and reduce the cracking factor of the low alloy steel side fusion line part.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. The utility model provides a xenogenesis steel welded joint which characterized in that: the welding line comprises ferrite (1) and austenite (2), and the included angle of the welding line between the ferrite (1) and the austenite (2) is 30 degrees.
2. A dissimilar steel welded joint according to claim 1, characterized in that: the welding seam of the ferrite (1) and the austenite (2) of the welding joint and the inner and outer walls of the extending part of the welding seam are treated by an aluminizing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011330472.5A CN112589333A (en) | 2020-11-24 | 2020-11-24 | Dissimilar steel welded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011330472.5A CN112589333A (en) | 2020-11-24 | 2020-11-24 | Dissimilar steel welded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112589333A true CN112589333A (en) | 2021-04-02 |
Family
ID=75183675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011330472.5A Pending CN112589333A (en) | 2020-11-24 | 2020-11-24 | Dissimilar steel welded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112589333A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108397A (en) * | 1986-12-01 | 1988-06-29 | 山东工业大学 | Aluminized steel tube single face welding and double face shaping welding coating and technology |
| CN101497154A (en) * | 2008-01-30 | 2009-08-05 | 株式会社神户制钢所 | Solid wire for carbon-dioxide shield welding |
| CN101670478A (en) * | 2009-10-23 | 2010-03-17 | 东方锅炉（集团）股份有限公司 | Sealing welding technique of low-alloy steel pipe plate and stainless steel pipe of low-pressure heat exchanger |
| JP2015104745A (en) * | 2013-11-29 | 2015-06-08 | 三菱重工業株式会社 | Characteristic stress determination method of welded structure, design method of welded construction and manufacturing method of welded structure |
| CN111098090A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Aluminizing pipeline welding method |
| CN111390350A (en) * | 2020-03-26 | 2020-07-10 | 鲁西工业装备有限公司 | Submerged-arc welding method for C-276 composite board |
-
2020
- 2020-11-24 CN CN202011330472.5A patent/CN112589333A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108397A (en) * | 1986-12-01 | 1988-06-29 | 山东工业大学 | Aluminized steel tube single face welding and double face shaping welding coating and technology |
| CN101497154A (en) * | 2008-01-30 | 2009-08-05 | 株式会社神户制钢所 | Solid wire for carbon-dioxide shield welding |
| CN101670478A (en) * | 2009-10-23 | 2010-03-17 | 东方锅炉（集团）股份有限公司 | Sealing welding technique of low-alloy steel pipe plate and stainless steel pipe of low-pressure heat exchanger |
| JP2015104745A (en) * | 2013-11-29 | 2015-06-08 | 三菱重工業株式会社 | Characteristic stress determination method of welded structure, design method of welded construction and manufacturing method of welded structure |
| CN111098090A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Aluminizing pipeline welding method |
| CN111390350A (en) * | 2020-03-26 | 2020-07-10 | 鲁西工业装备有限公司 | Submerged-arc welding method for C-276 composite board |
Non-Patent Citations (1)
| Title |
|---|
| 章应霖等: "焊接工艺因素对电站铁素体/奥氏体异种钢接头早期失效的影响", 《电力建设》 * |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210402 |
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| RJ01 | Rejection of invention patent application after publication |