JP2018086676A - Method for manufacturing dissimilar material weld joint of stainless steel base metal/nickel alloy base metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a dissimilar material weld joint that prevents weld cracks, in the dissimilar material weld joint having a welding base material comprising an austenitic stainless steel material and a Ni alloy material and becoming a combination using the 690-based Ni alloy as a filler material.SOLUTION: A method for manufacturing a dissimilar material weld joint concerning the present invention is provided by subjecting an austenitic stainless steel material and a Ni-based alloy to the groove weld through the weld metal. The method for manufacturing the dissimilar material weld joint is characterized by comprising: a welding base material preparation step; a first portion buttering step of performing buttering of a predetermined Ni alloy filler material in a groove route area of the austenitic stainless steel base metal side; a first groove weld step of welding to a front of a groove toe area by using a 690-based Ni alloy filler material; a second portion buttering step of performing buttering of the predetermined Ni alloy filler material in the groove toe area of the austenitic stainless steel base metal side; and a second groove weld step of welding the groove toe area by using the 690-based Ni alloy filler material.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a technique of a welded joint made of a corrosion-resistant high-strength alloy material (for example, a stainless steel material or a nickel-base alloy material) used in a nuclear power plant, and in particular, a dissimilar material welded joint formed by welding dissimilar alloy materials. It is related with the manufacturing method.

  In nuclear power plants such as boiling water nuclear power plants and improved boiling water nuclear power plants, reactor pressure vessels are usually made of low-alloy steel, and reactor internals such as core shrouds are made of austenitic stainless steel. The structural material is made of a nickel-based alloy material. For this reason, joining these members requires a technique for soundly producing a dissimilar welded joint formed by welding dissimilar alloy materials.

  In the welding of dissimilar alloy materials, the chemical composition of the materials to be welded (welded base metal, also simply referred to as a base metal) is different from each other, so that composition mixing is likely to occur in the welded portion (particularly weld metal). In addition, the corrosion resistance (for example, stress corrosion cracking characteristics) and the mechanical characteristics (for example, weld cracking resistance) inherent to the filler metal are difficult to deteriorate. Therefore, various techniques for obtaining a sound dissimilar welded joint by suppressing characteristic deterioration in the weld metal have been researched and developed.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2010-234419) relates to a dissimilar joint structure that joins a stainless steel pipe and a low alloy steel pipe whose inner surface is clad with stainless steel and in which a liquid flows. A method of manufacturing a dissimilar joint structure for the purpose of preventing the occurrence of surface cracking due to bond martensite on the outer surface side of a pipe made of nickel, and welding the nickel-base alloy welding material to the tip of the low alloy steel pipe Using the overlay welding to form a build-up weld made of nickel-base alloy, and welding the nickel-base alloy so as to cover the outer surface of the boundary between the build-up weld and the tip of the low alloy steel pipe Overlay welding is performed using a material to form a boundary welded portion made of a nickel-based alloy, and then a post-weld heat treatment is performed on the low-alloy steel pipe, followed by a post-weld heat treatment. And the above stainless steel And an end portion of the steel pipe by welding using a welding material nickel base alloy, a manufacturing method of the dissimilar joint structure and forming a weld joint made of nickel-based alloy is disclosed.

  Specifically, the welded joint described in Patent Document 1 is a dissimilar welded joint of a low alloy steel material and a stainless steel material, and a 152-based Ni-based alloy (152 alloy) or a 52-based Ni-based alloy (52 It is joined via a weld metal using an alloy. According to Patent Document 1, it is said that the occurrence of surface cracks due to the bond martensite structure on the outer surface side of the low alloy steel pipe can be prevented.

  Patent Document 2 (Japanese Patent Laid-Open No. 2012-187614) relates to a welding method for a structure used in a nuclear power plant or the like, which is a welding method for the purpose of preventing both stress corrosion cracking and welding cracking, Using a first welding material made of a Ni-base heat-resistant superalloy mainly composed of Ni with a Cr content of 25% by mass or less, forming a welded portion by welding the base metal, and exceeding a Cr content of 30% by mass And a step of welding the welded portion using a second welding material made of a Ni-base heat-resistant superalloy mainly composed of Ni.

  According to Patent Document 2, it is said that a welding method and a structure capable of preventing both stress corrosion cracking and weld cracking can be provided. Specifically, the weld joint described in Patent Document 2 is a dissimilar weld joint of an austenitic stainless steel material and a carbon steel material, and a weld metal using a Ni-based alloy having a Cr content of 25% by mass or less as a filler material. Are joined together. However, the specific alloy composition of the filler metal is not disclosed.

JP 2010-234419 A JP 2012-187614 A

Makoto Hiraoka, Takanori Uegaki, Kenji Shinozaki, Motomichi Yamamoto, Kota Kadoi, Ken Obana, Influence of dilution rate on hot cracking susceptibility of 690 series Ni-base alloy weld metal

  In joining nuclear reactor members, from the viewpoints of corrosion resistance and long-term reliability, a technology for the sound production of dissimilar welded joints made by welding dissimilar alloy materials (welding technology that suppresses property deterioration in weld metal) is extremely important. It is. The 690 series Ni-based alloy is known as an alloy having excellent corrosion resistance (for example, an alloy having high SCC resistance), and has recently been strongly expected to be used as a filler material for dissimilar welded joints in nuclear power plants. However, it is said that the 690 series Ni-base alloy has a weak point that weld cracking is likely to occur.

  Non-Patent Document 1 (influence of dilution rate on hot cracking susceptibility of 690 Ni-base alloy weld metal) studies welding using a 690 Ni-base alloy as a filler material. According to Non-Patent Document 1, when a 600 series Ni-base alloy material was used as the welding base material, no adverse effect was observed on the hot cracking susceptibility of the weld metal, but an austenitic stainless steel material (SUS316L) was used as the welding base material. ) Is reported to increase the hot cracking susceptibility of the weld metal.

  In welding between different types of alloy materials, the welding characteristics are greatly affected by the combination of the welding base material and the filler material. Therefore, when trying to use a 690 series Ni-based alloy as the filler material, Patent Documents 1 and 2 Simple use of technology is difficult. However, the high corrosion resistance of the 690 series Ni-base alloy is very attractive, and there is a strong demand for a welding technique that makes full use of the 690 series Ni-base alloy.

  Therefore, an object of the present invention is to suppress weld cracking in a dissimilar weld joint in which a weld base material is composed of an austenitic stainless steel material and a nickel base alloy material, and a combination using a 690 series nickel base alloy as a filler material. It is providing the manufacturing method of a dissimilar material welded joint.

One aspect of the present invention is a method for producing a dissimilar material welded joint in which an austenitic stainless steel base material and a nickel-based alloy base material are welded via a weld metal,
A welding base material preparing step of preparing the austenitic stainless steel base material and the nickel-based alloy base material;
A first partial buttering step of buttering a nickel-based alloy filler material containing a chromium component in an amount of 18% by mass or more and 22% by mass or less in a groove root region on the austenitic stainless steel base material side;
A first groove welding step of welding to the front of the groove toe region using a 690 series nickel-base alloy filler material;
A second partial buttering step of buttering a nickel-based alloy filler containing 18% by mass or more and 22% by mass or less of the chromium component in the groove tow region on the austenitic stainless steel base material side;
Manufacturing a dissimilar weld joint of stainless steel base material / nickel base alloy base material, comprising a second groove welding step of welding the groove toe region using the 690 series nickel base alloy filler metal A method is provided.

  In the present invention, the “groove welded joint” includes a butt weld joint, a T-shaped weld joint, a cross weld joint, a corner weld joint, a edge weld joint, and the like. In the buttering step and the welding step, each filler material has a melting rate of 100% (a state in which there is no unmelted filler material).

  According to the present invention, the dissimilar material welding in which the weld base metal is composed of an austenitic stainless steel material and a nickel-base alloy material, and the weld crack is suppressed in the dissimilar material welded joint using a 690-based nickel base alloy as a filler material. A method for manufacturing a joint can be provided.

It is a longitudinal cross-sectional schematic diagram which shows an example of the welding part of the dissimilar material welded joint based on a nonpatent literature 1. It is process drawing which shows an example of the manufacturing method of the dissimilar material welded joint which concerns on this invention. It is a longitudinal cross-sectional schematic diagram which shows an example of the mode after a welding preform | base_material preparation process. It is a longitudinal cross-sectional schematic diagram which shows an example of the mode after a 1st partial buttering process. It is a longitudinal cross-sectional schematic diagram which shows an example of the mode after a 1st groove welding process. It is a longitudinal cross-sectional schematic diagram which shows an example of the mode after a 2nd partial buttering process. It is a longitudinal cross-sectional schematic diagram which shows an example of the mode after a 2nd groove welding process. It is a longitudinal cross-sectional schematic diagram which shows another example of the mode after a welding preform | base_material preparation process. It is a longitudinal cross-sectional schematic diagram which shows another example of the mode after a 1st partial buttering process. It is a longitudinal cross-sectional schematic diagram which shows another example of the mode after a 1st groove welding process. It is a longitudinal cross-sectional schematic diagram which shows another example of the state after a 2nd partial buttering process. It is a longitudinal cross-sectional schematic diagram which shows another example of the mode after a 2nd groove welding process. It is a graph which shows the relationship between the mixing rate of two types of filler materials, and the ductile fall crack integrated length of a weld metal.

The present invention can add the following improvements and changes in the method for manufacturing a dissimilar weld joint of a stainless steel base material / nickel base alloy base material.
(I) The groove root region is a region of 2 mm or more in the base material thickness direction from the tip of the groove root and 1/3 or less of the base material thickness, and the groove toe region is a groove This is an area of 2 mm or more and 1/3 or less of the base material thickness in the base material thickness direction from the toe tip.
(Ii) The austenitic stainless steel base material is a kind selected from JIS standard SUS316, SUS316L, SUSF316, SUSF316L, SUS304, SUS304L, SUSF304, and SUSF304L, and the nickel base alloy base material is JIS standard NCF600. It consists of a kind selected from.
(Iii) The nickel-base alloy containing the chromium component in an amount of 18% by mass or more and 22% by mass or less is a kind selected from AWS standard A5.14.
(Iv) The 690 series nickel base alloy is made of one kind selected from filler metal described in Core Case 2142-4 of Boiler and Pressure Vessel Code of American Society of Mechanical Engineerings.

(Preliminary examination experiment and basic technical idea of the present invention)
The present inventor uses an austenitic stainless steel base material (SUS316L, thickness 50 mm), a nickel base alloy base material (600 series Ni base alloy, thickness 50 mm) and a 690 series nickel base alloy filler metal. Groove welding was performed to produce a dissimilar material welded joint, and the confirmation experiment of Non-Patent Document 1 was performed. At this time, the longitudinal cross-sectional structure of the welded portion of the specimen where the weld crack occurred was observed and investigated in detail. FIG. 1 is a schematic longitudinal sectional view showing an example of a welded portion of a dissimilar material welded joint based on Non-Patent Document 1.

  As shown in FIG. 1, the dissimilar welded joint based on Non-Patent Document 1 has austenitic stainless steel base material 1 and nickel-base alloy base material 2 welded via a weld metal 3. It was confirmed that weld cracking was likely to occur near the boundary of metal 3 on the austenitic stainless steel base material 1 side. At this time, weld cracks occur in the groove root region 4 (region of 1/3 or less of the base metal thickness from the tip of the groove root to the base metal thickness direction) that is the welding start portion and the groove toe portion that is the welding end portion. It was found that the occurrence was concentrated in the region 5 (region of 1/3 or less of the base material thickness in the base material thickness direction from the tip of the groove tow). In other words, it was found that almost no weld cracks were observed in the intermediate region between the groove root region 4 and the groove toe region 5.

  Therefore, the present inventor provides a composition buffer layer in the groove root region 4 and the groove toe region 5 on the austenitic stainless steel base material 1 side where weld cracks are intensively generated. I thought to suppress this. As a result of earnest examination, after forming a composition buffer layer by buttering a nickel-based alloy filler containing 18% by mass to 22% by mass of a chromium component in the groove root region 4 and the groove toe region 5, It has been found that by performing groove welding with a 690 series Ni-base alloy filler metal, weld cracking can be suppressed while using a 690 series Ni-base alloy having high corrosion resistance as the main filler metal of the weld metal. The present invention has been completed based on this finding.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the present invention is not limited to the embodiments taken up here, and can be combined and improved as appropriate without departing from the technical idea of the invention. Moreover, the same code | symbol may be attached | subjected to a synonymous site | part and the overlapping description may be abbreviate | omitted.

  FIG. 2 is a process diagram showing an example of a method for manufacturing a dissimilar material welded joint according to the present invention. As shown in FIG. 2, the manufacturing method of the present invention includes a welding base material preparation step, a first buttering step, a first groove welding step, a second buttering step, and a second groove welding step. Have. Hereinafter, embodiments of the present invention will be described more specifically.

[First Embodiment]
In the first embodiment, a butt weld joint will be described as an example.

(Welding base material preparation process)
FIG. 3 is a schematic longitudinal sectional view showing an example of a state after the welding base material preparation step. As shown in FIG. 3, this step is a step of preparing a weld base material by subjecting the weld surfaces of the austenitic stainless steel base material 1 and the nickel-base alloy base material 2 to groove processing.

  The shape of the groove is not particularly limited, and a conventional shape (for example, I shape, V shape, U shape, X shape) can be appropriately selected. In addition, even if it is a case where clear machining is not performed with respect to a welding surface, this invention makes a welding base material preparation process by cleaning a welding surface (for example, removal of an oxide scale).

  The materials of the austenitic stainless steel base material 1 and the nickel base alloy base material 2 are not particularly limited as long as they are corrosion-resistant high-strength alloy materials used in nuclear power plants. As the austenitic stainless steel material, for example, JIS standard SUS304, SUS304L, SUSF304, SUSF304L, SUS316, SUS316L, SUSF316, and SUSF316L can be suitably used. As the nickel-base alloy material, for example, JIS standard NCF600 can be suitably used.

(First partial buttering process)
FIG. 4 is a schematic longitudinal sectional view showing an example of a state after the first partial buttering step. As shown in FIG. 4, in this step, a nickel-base alloy filler material containing a chromium component in an amount of 18% by mass to 22% by mass in the groove root region 4 on the austenitic stainless steel base material 1 side is battered. In this step, the composition buffer layer 6 is formed.

  The groove root region 4 forming the composition buffer layer 6 is a region of 2 mm or more and 1/3 or less of the base material thickness from the tip of the groove root, or a region of 2 mm or more and 15 mm or less. Is preferred. When the groove root region 4 forming the composition buffer layer 6 is less than 2 mm, the effect of the composition buffer layer 6 (suppression of weld cracking) cannot be sufficiently obtained. On the other hand, when the groove root region 4 forming the composition buffer layer 6 exceeds 1/3 of the base metal thickness, the effect of using a 690 series Ni-based alloy as the main filler metal of the weld metal (excellent corrosion resistance) Can not fully enjoy.

  As the nickel-base alloy filler containing 18% by mass to 22% by mass of the chromium component, one kind selected from AWS standard A5.14 (for example, ERNiCr-3) can be suitably used. Further, the composition buffer layer 6 formed by buttering may be a single layer, but it is more preferable to form three or more layers.

(First groove welding process)
FIG. 5 is a schematic longitudinal sectional view illustrating an example of a state after the first groove welding process. As shown in FIG. 5, this step is a step of forming the weld metal 7 by welding to the front of the groove toe region 5 using a 690 series nickel base alloy filler metal. As the 690 series nickel-base alloy filler metal, a kind selected from filler metal described in Core Case 2142-4 of Boiler and Pressure Vessel Code of the American Society of Mechanical Engineerings (for example, ERNiCrFe-13) is preferably used. Can do. Since the composition buffer layer 6 is formed in advance, weld cracks in the groove root region 4 can be suppressed.

(Second partial buttering process)
FIG. 6 is a schematic longitudinal sectional view showing an example of a state after the second partial buttering step. As shown in FIG. 6, in this step, a nickel-base alloy filler material containing 18% to 22% by mass of a chromium component is buttered in the groove toe region 5 on the austenitic stainless steel base material 1 side. In this step, the composition buffer layer 6 ′ is formed.

  The groove toe region 5 that forms the composition buffer layer 6 ′ is an area that is 2 mm or more and 1/3 or less of the base material thickness from the tip of the groove toe, or 2 mm or more and 15 mm or less. A region is preferred. When the groove toe region 5 forming the composition buffer layer 6 ′ is less than 2 mm, the effect of the composition buffer layer 6 ′ (suppression of weld cracking) cannot be sufficiently obtained. On the other hand, when the grooved tow region 5 forming the composition buffer layer 6 ′ exceeds 1/3 of the base metal thickness, the effect of using a 690 series Ni-base alloy as the main filler metal of the weld metal (excellent corrosion resistance) ) Cannot be fully enjoyed.

  As the nickel-base alloy filler for forming the composition buffer layer 6 ′, the same nickel-base alloy filler as for forming the composition buffer layer 6 can be preferably used. Further, the composition buffer layer 6 ′ formed by buttering may be a single layer, but it is more preferable to form three or more layers.

(Second groove welding process)
FIG. 7 is a schematic longitudinal sectional view showing an example of a state after the second groove welding process. As shown in FIG. 7, this step is a step of forming the weld metal 7 ′ by welding the groove toe region 5 using a 690 series nickel base alloy filler metal. Since the composition buffer layer 6 ′ is formed in advance, weld cracks in the groove toe region 5 can be suppressed.

  Through the above steps, a 690 series nickel base alloy is used as a filler material, and a butt weld joint of a stainless steel base material / nickel base alloy base material with suppressed weld cracking can be obtained. In addition, you may perform the surface finishing of a groove root side and a groove toe side after a 2nd groove welding process as needed.

[Second Embodiment]
In the second embodiment, a T-shaped welded joint will be described as an example. This embodiment is different from that of the first embodiment in the shape of the welded joint, but the basic technical idea is the same. Therefore, the description overlapping with the first embodiment is omitted below.

(Welding base material preparation process)
FIG. 8 is a schematic longitudinal sectional view showing another example of the state after the welding base material preparation step. As shown in FIG. 8, this step is a step of preparing a weld base material by performing groove processing on the weld surface of the nickel base alloy base material 2 and cleaning the weld surface of the austenitic stainless steel base material 1. is there. In addition, in FIG. 8, although it was set as the K-shaped groove shape, it may be a re-shaped groove shape.

(First partial buttering process)
FIG. 9 is a schematic longitudinal sectional view showing another example of the state after the first partial buttering step. As shown in FIG. 9, in this step, a nickel-base alloy solution containing a chromium component in an amount of 18% by mass or more and 22% by mass or less in the groove root region 4 (welding start portion) on the austenitic stainless steel base material 1 side. In this step, the composition buffer layer 6 is formed by buttering the additive.

  In this embodiment, since the groove shape is K-shaped, the groove root region 4 for forming the composition buffer layer 6 is centered on the tip of the groove root of the nickel-based alloy base material 2. A region that is 2 mm or more and 1/3 or less of the base material thickness in the thickness direction of the material 2 or a region that is 2 mm or more and 15 mm or less in total is preferable.

(First groove welding process)
FIG. 10 is a schematic longitudinal sectional view showing another example of the state after the first groove welding process. As shown in FIG. 10, this step is a step of forming the weld metal 7 by welding to the front of the groove toe region 5 (welding end portion) using a 690 series nickel base alloy filler metal. Since the composition buffer layer 6 is formed in advance, weld cracks in the groove root region 4 can be suppressed.

(Second partial buttering process)
FIG. 11 is a schematic longitudinal sectional view showing another example of the state after the second partial buttering step. As shown in FIG. 11, in this step, a nickel-base alloy filler material containing 18 to 22% by mass of a chromium component is buttered in the groove tow region 5 on the austenitic stainless steel base material 1 side. In this step, the composition buffer layer 6 ′ is formed.

  In this embodiment, since the groove shape is K-shaped, the groove toe region 5 forming the composition buffer layer 6 ′ is from the position of the extension line of the groove toe tip of the nickel base alloy base material 2, Area of 1 mm or more and 1/6 or less of the base material thickness on one side in the thickness direction of the nickel base alloy base material 2 (area of 2 mm or more in total on both sides and 1/3 or less of the base material thickness), or A region of 1 mm to 8 mm on one side (a region of 2 mm to 15 mm in total on both sides) is preferable.

(Second groove welding process)
FIG. 12 is a schematic longitudinal sectional view showing another example of the state after the second groove welding process. As shown in FIG. 12, this step is a step of forming the weld metal 7 ′ by welding the groove toe region 5 using a 690 series nickel base alloy filler metal. Since the composition buffer layer 6 ′ is formed in advance, weld cracks in the groove toe region 5 can be suppressed.

  Through the above steps, a T-welded joint of a stainless steel base material / nickel base alloy base material using a 690 series nickel base alloy as a filler metal and suppressing weld cracking can be obtained. In addition, you may perform the surface finish of a groove toe side after a 2nd groove welding process as needed.

  Hereinafter, the present invention will be further described through specific experiments. Note that the present invention is not limited to these experiments.

(Experiment to confirm the effect of weld metal mixing on weld cracks)
Stainless steel base material (made of JIS SUS316L, 5 mm thick plate material) and nickel base alloy base material (made of JIS NCF600, 5 mm thick plate material) are prepared as base materials. Nickel-base alloy filler metal (AWS ERNiCrFe-13, 1 mm diameter wire) and nickel-base alloy filler metal (AWS ERNiCr-3, 1 mm diameter) containing 18 to 22 mass% chromium component Wire).

  The prepared stainless steel base material and nickel base alloy base material were groove-welded to produce a butt weld joint. At this time, a sample in which the mixing ratio of the two types of filler materials was changed by controlling the feeding amount of the ERNiCrFe-13 filler material and the ERNiCr-3 filler material.

  A Trans-Varestraint test was performed on the prepared sample while remelting a part of the weld metal, and the weld crack susceptibility was evaluated by measuring the cumulative length of ductile drop cracks by microscopic observation. In addition, the definition of a crack shall be 100 micrometers or more. The results are shown in FIG.

  FIG. 13 is a graph showing the relationship between the mixing ratio of the two types of filler metal and the integrated ductile drop crack length. As shown in FIG. 13, in a dissimilar welded joint of stainless steel base material / nickel base alloy base material, ERNiCrFe-13 filler metal is mixed with ERNiCrFe-13 filler material to mix ERNiCrFe-13 filler metal. It was confirmed that the cumulative ductility-reduced crack length was shorter than that of the single material, and the weld crack sensitivity of the weld metal was reduced (weld soundness was improved).

  The above-described embodiments and examples are described in order to facilitate understanding of the present invention, and the present invention is not limited to the specific configurations described. For example, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. That is, according to the present invention, a part of the configurations of the embodiments and examples of the present specification can be deleted, replaced with other configurations, and added with other configurations.

1 ... austenitic stainless steel base material, 2 ... nickel base alloy base material, 3 ... weld metal,
4 ... groove root region, 5 ... groove toe region, 6, 6 '... composition buffer layer, 7, 7' ... weld metal.

Claims (5)

An austenitic stainless steel base material and a nickel-base alloy base material are manufacturing methods of a dissimilar material welded joint in which groove welding is performed via a weld metal,
A welding base material preparing step of preparing the austenitic stainless steel base material and the nickel-based alloy base material;
A first partial buttering step of buttering a nickel-based alloy filler material containing a chromium component in an amount of 18% by mass or more and 22% by mass or less in a groove root region on the austenitic stainless steel base material side;
A first groove welding step of welding to the front of the groove toe region using a 690 series nickel-base alloy filler material;
A second partial buttering step of buttering a nickel-based alloy filler containing 18% by mass or more and 22% by mass or less of the chromium component in the groove tow region on the austenitic stainless steel base material side;
Manufacturing a dissimilar weld joint of stainless steel base material / nickel base alloy base material, comprising a second groove welding step of welding the groove toe region using the 690 series nickel base alloy filler metal Method. In the manufacturing method of the dissimilar material welded joint of the stainless steel base material / nickel base alloy base material according to claim 1,
The groove root area is an area of 2 mm or more in the base material thickness direction from the tip of the groove root and 1/3 or less of the base material thickness,
The groove toe region is a region of 2 mm or more in the base material thickness direction from the tip of the groove toe and 1/3 or less of the base material thickness. A method for manufacturing a dissimilar material welded joint. In the manufacturing method of the dissimilar material welded joint of the stainless steel base material / nickel base alloy base material according to claim 1 or 2,
The austenitic stainless steel base material consists of one kind selected from JIS standard SUS316, SUS316L, SUSF316, SUSF316L, SUS304, SUS304L, SUSF304, and SUSF304L,
The method for producing a dissimilar weld joint of stainless steel base material / nickel base alloy base material, wherein the nickel base alloy base material is made of one kind selected from JIS standard NCF600. In the manufacturing method of the dissimilar material welded joint of the stainless steel base material / nickel base alloy base material according to any one of claims 1 to 3,
The nickel-base alloy containing the chromium component in an amount of 18% by mass or more and 22% by mass or less is composed of one kind selected from AWS standard A5.14. Manufacturing method. In the manufacturing method of the dissimilar material welded joint of the stainless steel base material / nickel base alloy base material according to any one of claims 1 to 4,
The 690 series nickel-base alloy is composed of one kind selected from filler metal described in Core Case 2142-4 of Boiler and Pressure Vessel Code of AWS Society of American Engineering of Mechanical Engineerings / A method for producing a dissimilar weld joint of a nickel-base alloy base material.

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