CN118106699A - Dissimilar steel joint structure for relieving early failure and welding method - Google Patents
Dissimilar steel joint structure for relieving early failure and welding method Download PDFInfo
- Publication number
- CN118106699A CN118106699A CN202311662564.7A CN202311662564A CN118106699A CN 118106699 A CN118106699 A CN 118106699A CN 202311662564 A CN202311662564 A CN 202311662564A CN 118106699 A CN118106699 A CN 118106699A
- Authority
- CN
- China
- Prior art keywords
- welding
- joint
- pipe
- dissimilar steel
- ferrite
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 91
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims description 40
- 229910001566 austenite Inorganic materials 0.000 claims description 31
- 238000005269 aluminizing Methods 0.000 claims description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000010410 layer Substances 0.000 claims description 8
- 230000008646 thermal stress Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 230000000116 mitigating effect Effects 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 34
- 238000007254 oxidation reaction Methods 0.000 abstract description 34
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 8
- 239000010953 base metal Substances 0.000 abstract description 7
- 230000003993 interaction Effects 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 description 5
- 229910015372 FeAl Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004584 weight gain Effects 0.000 description 2
- 235000019786 weight gain Nutrition 0.000 description 2
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of supporting welding pieces, in particular to a dissimilar steel joint structure for relieving early failure and a welding method. The invention controls creep strain and oxidation respectively, reduces the strain of the fusion line part at the side of the base metal of the low alloy steel, improves the oxidation resistance of the inner wall and the outer wall of the dissimilar steel welded joint pipe, and weakens the oxidation effect and the strain effect. Meanwhile, oxidation gaps are effectively avoided being generated at the welding line (large creep strain) position of the dissimilar steel welding joint on the low alloy steel side, so that interaction of oxidation and strain is separated, failure probability of the dissimilar steel welding joint is greatly reduced, and early cracking of the dissimilar steel joint is effectively prevented.
Description
Technical Field
The invention relates to the technical field of support welding pieces, in particular to a dissimilar steel joint structure for relieving early failure and a welding method.
Background
In recent years, as utility boilers enter the ultra-supercritical and ultra-supercritical times, the number of ferrite/austenite dissimilar steel welded joints of high-temperature parts of the boilers is increasing. The early failure of the dissimilar steel joint has the problems of long time span, difficult detection by a conventional flaw detection method and the like, so that supervision countermeasures are difficult to formulate. Through carrying out deep analysis and research on heterogeneous steel joints of different operating parameters, different failure times and different materials of a plurality of units, the fracture positions of the heterogeneous steel joints with early failure are all positioned at the weld line interface of the side of ferritic steel (low alloy steel). On the one hand, the oxidation resistance of the low alloy steel side welding line part is poor, and the oxidation tip notch of the inner wall and the outer wall of the welded joint pipe is easy to oxidize, as shown in figure 1. In addition, the weld line portion on the low alloy steel side is subjected to a large strain due to the influence of the dissimilar steel joint structure. As shown in fig. 2, the interaction of oxidation and creep strain in the service process of the weld line part at the side of the base metal of the low alloy steel promotes and overlaps each other, so that the failure of the welded joint of the dissimilar steel tube is accelerated, and the early failure of the joint is shown. In order to prevent the occurrence of early failure of the dissimilar steel joint, a dissimilar steel joint structure for relieving the early failure and a welding method are provided.
Disclosure of Invention
In order to solve at least one technical problem, the invention provides a dissimilar steel joint structure for relieving early failure and a welding method, wherein a welding joint with an optimal groove angle of 60 degrees is welded between a ferrite pipe and an austenite pipe through finite element calculation of thermal stress and creep coupling, and aluminizing treatment is carried out on the welding joint and the inner wall and the outer wall of a joint part of the welding joint, the ferrite pipe and the austenite pipe, so that the problems of early failure and low service life of the dissimilar steel welding joint caused by creep and oxidation of the welding joint are solved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a dissimilar steel joint structure for relieving early failure, which comprises a ferrite pipe and an austenite pipe, wherein a welding joint is welded between the ferrite pipe and the austenite pipe, the bevel angle of the welding joint is 60 degrees, and aluminized layers are arranged on the welding joint and the inner wall and the outer wall of the joint part of the welding joint, the ferrite pipe and the austenite pipe.
Preferably, the welded joint has a sector-shaped cross section along the longitudinal direction of the ferrite pipe or the austenite pipe.
A second aspect of the present invention provides a welding method for a dissimilar steel joint of the first aspect for early failure mitigation, comprising the steps of:
s1, optimizing and obtaining a welding joint groove angle for reducing creep strain to be 60 degrees through finite element calculation of thermal stress and creep coupling;
s2, machining to enable the inner sides of the ferrite pipe to be welded and the inner sides of the austenitic steel pipe to be flush;
S3, machining 60-degree grooves on the sides of the ferrite pipe and the austenitic pipe;
S4, preprocessing the groove and the base material;
s5, preheating the ferrite tube and the austenite tube before welding;
S6, adopting a hot wire TIG welding method to carry out bottoming, filling and capping by using a welding wire, and introducing argon into a ferrite pipe and an austenite pipe for protection during welding;
s7, after welding, performing postweld heat treatment on the welded joint;
S8, aluminizing treatment is carried out on the inner wall and the outer wall of the welded joint and the inner wall and the outer wall of the joint part of the welded joint and the ferrite pipe and the austenitic pipe by adopting aluminizing agent, and argon is introduced for protection.
Preferably, the pretreatment in S4 includes paint scale and rust cleaning until metallic luster is leaked.
Preferably, the temperature of the preheating treatment in S5 is 150-250 ℃.
Preferably, the welding wire in the step S6 is 182-class nickel-based alloy welding wire, and the specification is phi 1.0mm.
Preferably, the hot wire TIG welding method adopts welding voltage of 8-11V, welding current of 100-170A, welding speed of 5-9 mm/min and interlayer temperature of less than 150 ℃.
Preferably, the heat treatment temperature in the step S7 is 740-760 ℃, and the heat treatment time is 1-2 h.
Preferably, the aluminizing agent in the S8 is 98% FeAl powder and 2% NH 4 Cl by mass fraction.
Preferably, the aluminizing treatment temperature in the step S8 is 650 ℃, the aluminizing time is more than or equal to 3 hours, and the depth of the aluminized layer is more than or equal to 10 mu m.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, through the finite element calculation of thermal stress and creep coupling, a welding joint with an optimal groove angle of 60 degrees is welded between a ferrite pipe and an austenite pipe, aluminizing treatment is carried out on the welding joint and the inner wall and the outer wall of the joint of the welding joint, the ferrite pipe and the austenite pipe, the creep strain and the oxidation are respectively controlled, the strain of a welding line part at the side of a base metal of low alloy steel is reduced, the oxidation resistance of the inner wall and the outer wall of the dissimilar steel welding joint pipe is improved, and the oxidation effect and the strain effect are weakened. Meanwhile, oxidation gaps are effectively avoided being generated at the welding line (large creep strain) position of the dissimilar steel welding joint on the low alloy steel side, so that interaction of oxidation and strain is separated, failure probability of the dissimilar steel welding joint is greatly reduced, and early cracking of the dissimilar steel joint is effectively prevented.
Drawings
FIG. 1 is a view of oxidation notch at the weld line site of the low alloy steel side of a dissimilar steel joint;
FIG. 2 is a graph of a low alloy steel side weld line portion back scattering (EBSD) analysis of a dissimilar steel weld joint;
FIG. 3 is a block diagram of a dissimilar steel joint to mitigate early failure;
FIG. 4 is a schematic view of a conventional dissimilar steel welded joint;
FIG. 5 is a finite element analysis diagram of the temperature difference between the inside and outside of a ferrite tube and an austenite tube according to the present invention;
FIG. 6 is a finite element strain analysis chart of a weld joint low alloy steel side weld line part at different bevel angles in the invention;
in the figure: 1. a ferrite tube; 2. an austenitic tube; 3. welding the joint; 4. and (3) an aluminizing layer.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention.
Example 1
Referring to fig. 3, a dissimilar steel joint structure for alleviating early failure includes a ferrite tube 1 and an austenite tube 2, a welded joint 3 is welded between the ferrite tube 1 and the austenite tube 2, the bevel angle of the welded joint 3 is 60 °, and aluminized layers 4 are provided on the welded joint 3 and inner and outer walls of the joint portion of the welded joint 3 and the ferrite tube 1 and the austenite tube 2. The welded joint 3 has a sector-shaped cross section along the longitudinal direction of the ferrite pipe 1 or the austenite pipe 2 at the time of actual welding.
According to the embodiment, through the finite element calculation of thermal stress and creep coupling, the welding joint 3 with the optimal groove angle of 60 degrees is welded between the ferrite pipe 1 and the austenite pipe 2, aluminizing treatment is carried out on the welding joint 3 and the inner wall and the outer wall of the joint part of the welding joint 3, the ferrite pipe 1 and the austenite pipe 2, the creep strain and the oxidation are respectively controlled, the strain of the welding line part at the side of the base metal of the low alloy steel is reduced, the oxidation resistance of the inner wall and the outer wall of the dissimilar steel welding joint 3 is improved, and the oxidation effect and the strain effect are weakened. Meanwhile, oxidation gaps are effectively avoided being generated at the low alloy steel side fusion line (large creep strain) part of the dissimilar steel welding joint 3, so that interaction of oxidation and strain is separated, failure probability of the dissimilar steel welding joint 3 is greatly reduced, and early cracking of the dissimilar steel joint is effectively prevented.
It should be noted that, the fracture positions of the conventional dissimilar steel joints where early failure occurs are all located at the weld line interface, firstly, oxidation sharp notches are formed on the inner and outer walls of the weld line part on the side of the ferrite tube 1 (low alloy steel), secondly, large creep strain exists on the weld line part on the side of the low alloy steel, and the creep strain and oxidation are all located at the weld line part on the side of the low alloy steel of the dissimilar steel joint.
Example two
A welding method for dissimilar steel joints for early failure mitigation of embodiment one,
S1, optimizing and obtaining the welding joint 3 bevel angle for reducing the creep strain to be 60 degrees through finite element calculation of thermal stress and creep coupling.
As shown in fig. 4, the bevel angle of the conventional dissimilar steel welded joint 3 is about 45 degrees, but the oxidation resistance of the low alloy steel side welding line part of the welded joint 3 is poor, and oxidation sharp notches exist on the inner wall and the outer wall of the welded joint 3. In addition, the weld line portion on the low alloy steel side is subjected to a large strain due to the influence of the dissimilar steel joint structure.
In order to optimize the angle of the welded joint 3, as shown in fig. 5, by finite element stress analysis, an axisymmetric model is adopted, meanwhile, the influence of the temperature difference between the inside and outside of the ferrite pipe 1 and the austenite pipe 2 is considered, and on the basis of obtaining a temperature field, the thermal stress is calculated, the creep process is coupled, and the creep strain of the dissimilar steel joints with different groove angles is calculated.
As shown in fig. 6, the creep strain of the weld line portion on the low alloy steel base metal side of the dissimilar steel joint is much smaller than the conventional 45 ° when the bevel angle is 60 ° as seen from the finite element strain gap of the weld line portion on the low alloy steel side of the different bevel angle of the welded joint 3.
And S2, machining to enable the inner sides of the ferrite pipe 1 to be welded and the austenitic steel pipe to be flush.
S3, machining 60-degree grooves on the sides of the ferrite tube 1 and the austenite tube 2.
S4, preprocessing the groove and the base material; wherein, the pretreatment comprises cleaning paint dirt, rust stain and the like until metallic luster is leaked.
S5, preheating the ferrite tube 1 and the austenite tube 2 before welding; wherein the temperature of the preheating treatment is 150-250 ℃.
S6, adopting a hot wire TIG welding method to carry out bottoming, filling and capping by using welding wires, and introducing argon into the ferrite tube 1 and the austenite tube 2 for protection during welding.
The hot wire TIG welding method is also called Tungsten argon arc welding (tunesten INERT GAS WELDING). The principle is that a direct current or alternating current power supply is used for generating the height Wen Yahu, energy is concentrated at the welding seam through a tungsten electrode, and then molten metal is filled into the welding seam to form a continuous welding seam.
The welding wire is 182-class nickel-based alloy welding wire, and the specification is phi 1.0mm; the hot wire TIG welding method adopts welding voltage of 8-11V, welding current of 100-170A, welding speed of 5-9 mm/min and interlayer temperature of less than 150 ℃.
S7, after welding, performing postweld heat treatment on the welded joint 3; wherein the heat treatment temperature is 740-760 ℃ and the heat treatment time is 1-2 h.
S8, aluminizing treatment is carried out on the inner wall and the outer wall of the welded joint 3 and the inner wall and the outer wall of the joint part of the welded joint and the joint parts of the welded joint, the ferrite pipe 1 and the austenitic pipe 2 by adopting an aluminizing agent, and argon is introduced for protection.
The aluminizing agent is 98% FeAl powder and 2% NH 4 Cl by mass.
It is understood that the aluminizing temperature is not higher than the actual service temperature of the joint, and the joint performance is not affected. The oxidation weight gain of the base metal of the low alloy steel which is not aluminized reaches 17mg/cm < 2 > after 3000 hours of oxidation, and after aluminizing, the oxidation weight gain of 3000 hours of oxidation is only 0.1mg/cm < 2 >, the oxidation resistance is improved by about 170 times, and the aluminized layer 4 does not crack and peel after long-term service. In consideration of the above factors, the aluminizing treatment temperature in this embodiment is 650 ℃, the aluminizing time is not less than 3 hours, and the depth of the aluminized layer 4 is not less than 10 μm. The specific process steps of the aluminizing treatment belong to the prior art and are not described in detail herein.
According to the invention, through the finite element calculation of thermal stress and creep coupling, the welding joint 3 with the optimal groove angle of 60 degrees is welded between the ferrite pipe 1 and the austenite pipe 2, and aluminizing treatment is carried out on the welding joint 3 and the inner wall and the outer wall of the joint part of the welding joint 3, the ferrite pipe 1 and the austenite pipe 2, so that the creep strain and the oxidation are respectively controlled, the strain of the fusion line part at the side of the low alloy steel base metal is reduced, the oxidation resistance of the inner wall and the outer wall of the dissimilar steel welding joint 3 is improved, and the oxidation effect and the strain effect are weakened. Meanwhile, oxidation gaps are effectively avoided being generated at the low alloy steel side fusion line (large creep strain) part of the dissimilar steel welding joint 3, so that interaction of oxidation and strain is separated, failure probability of the dissimilar steel welding joint 3 is greatly reduced, and early cracking of the dissimilar steel joint is effectively prevented.
While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present application, and such modifications and changes should be considered as being within the scope of the present application.
Claims (10)
1. The utility model provides a alleviate dissimilar steel joint structure of early failure, includes ferrite pipe (1) and austenite pipe (2), the welding has welded joint (3) between ferrite pipe (1) and austenite pipe (2), its characterized in that, the groove angle of welded joint (3) is 60, welded joint (3) and welded joint (3) all are equipped with aluminizing layer (4) with the interior outer wall of ferrite pipe (1) and austenite pipe (2) meeting portion.
2. A dissimilar steel joint structure for alleviating early failure according to claim 1, wherein the welded joint (3) has a sector-shaped cross section along the length direction of the ferrite tube (1) or the austenite tube (2).
3. A welding method for the early failure mitigating dissimilar steel joint of claim 1 or 2, comprising the steps of:
S1, optimizing and obtaining the groove angle of a welding joint (3) for reducing the creep strain to be 60 degrees through finite element calculation of thermal stress and creep coupling;
S2, machining to enable the inner sides of the ferrite pipe (1) to be welded and the austenitic steel pipe to be flush;
s3, machining 60-degree grooves on the sides of the ferrite tube (1) and the austenite tube (2);
S4, preprocessing the groove and the base material;
S5, preheating the ferrite tube (1) and the austenite tube (2) before welding;
s6, adopting a hot wire TIG welding method to carry out bottoming, filling and capping by using a welding wire, and introducing argon into the ferrite tube (1) and the austenite tube (2) for protection during welding;
S7, after welding, performing postweld heat treatment on the welded joint (3);
S8, aluminizing treatment is carried out on the inner wall and the outer wall of the welded joint (3) and the inner wall and the outer wall of the joint part of the welded joint and the ferrite pipe (1) and the austenitic pipe (2) by adopting an aluminizing agent, and argon is introduced for protection.
4. A dissimilar steel joint structure for alleviating early failure according to claim 3, wherein said pretreatment in S4 comprises paint scale and rust cleaning until metallic luster is leaked.
5. A dissimilar steel joint structure for alleviating early failure according to claim 3, wherein the temperature of the preheating treatment in S5 is 150 to 250 ℃.
6. A dissimilar steel joint structure for alleviating early failure according to claim 3, wherein the welding wire in S6 is a 182-class nickel-based alloy welding wire with a specification of Φ1.0mm.
7. The dissimilar steel joint structure for relieving early failure according to claim 3, wherein the hot wire TIG welding method adopts a welding voltage of 8-11V, a welding current of 100-170A, a welding speed of 5-9 mm/min and an interlayer temperature of less than 150 ℃.
8. A dissimilar steel joint structure for alleviating early failure according to claim 3, wherein the heat treatment temperature in S7 is 740 to 760 ℃ and the heat treatment time is 1 to 2 hours.
9. A dissimilar steel joint structure for alleviating early failure according to claim 3, wherein the aluminizing agent in S8 is 98% feal powder and 2% nh 4 Cl by mass.
10. A dissimilar steel joint structure for relieving early failure according to claim 3, wherein the aluminizing treatment temperature in S8 is 650 ℃, the aluminizing time is not less than 3 hours, and the depth of the aluminizing layer (4) is not less than 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662564.7A CN118106699A (en) | 2023-12-06 | 2023-12-06 | Dissimilar steel joint structure for relieving early failure and welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311662564.7A CN118106699A (en) | 2023-12-06 | 2023-12-06 | Dissimilar steel joint structure for relieving early failure and welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118106699A true CN118106699A (en) | 2024-05-31 |
Family
ID=91207582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311662564.7A Pending CN118106699A (en) | 2023-12-06 | 2023-12-06 | Dissimilar steel joint structure for relieving early failure and welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118106699A (en) |
-
2023
- 2023-12-06 CN CN202311662564.7A patent/CN118106699A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5688419A (en) | Method for mitigating residual stresses in welded metal components using high torch travel speeds | |
| CN101462193B (en) | Method for welding thin layer iron nickel base alloy carbon steel composite tube | |
| CN106232279B (en) | Stepped design weld joint groove | |
| CN106695079B (en) | The welding method of composite bimetal pipe | |
| CN109865955B (en) | Welding method combining manual tungsten electrode argon arc welding and shielded metal arc welding for G115 large-diameter pipe | |
| WO2023179061A1 (en) | Manufacturing process for plunger pump casing, plunger pump casing, and plunger pump | |
| CN105665898A (en) | Automatic submerged arc welding method for pearlitic heat-resistant steel composite board | |
| Zhang et al. | Effect of preheating on the microstructure and properties of fiber laser welded girth joint of thin-walled nanostructured Mo alloy | |
| JP6348059B2 (en) | First electrode welding torch for multi-electrode submerged arc welding and welding method using the same | |
| CN108608096A (en) | A kind of welding procedure method of oil and gas transmission mechanical composite tube | |
| JP4912097B2 (en) | MULTILAYER WELDING METHOD FOR STAINLESS STEEL PIPE AND MULTILAYER WELDING | |
| US5670072A (en) | Method and apparatus for joining metal components with mitigation of residual stresses | |
| CN118106699A (en) | Dissimilar steel joint structure for relieving early failure and welding method | |
| CN105983766A (en) | Low-carbon steel and alloy steel welding method | |
| JP3712797B2 (en) | Welded structure of ferritic heat resistant steel pipe | |
| JP2006088226A (en) | Welding of vessel internals with noble metal technology | |
| Niagaj | Use of A-TIG method for welding of titanium, nickel, their alloys and austenitic steels | |
| CN102941399B (en) | Gas-shielded welding method for pearlite heat-resistant steel structural members | |
| CN118832262A (en) | Non-isolation layer welding method for dissimilar metal of low alloy steel connecting pipe and stainless steel safety end | |
| CN112548277A (en) | Weld joint interface structure optimization method for dissimilar steel welded joint of thermal power plant | |
| CA2185996C (en) | Method for mitigating residual stresses in welded metal components using high torch travel speeds | |
| CN108127226A (en) | A kind of welding method of mild steel and stainless steel | |
| KR20240109457A (en) | Method of connecting reactor nozzle and pipe in nuclear power plant | |
| CN117583705B (en) | High-strength high-toughness corrosion-resistant welding method for TKY nodes of deepwater jacket | |
| JP3684475B2 (en) | Welded structure of ferritic heat resistant steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |