JPH0256188B2 - - Google Patents
Info
- Publication number
- JPH0256188B2 JPH0256188B2 JP56053618A JP5361881A JPH0256188B2 JP H0256188 B2 JPH0256188 B2 JP H0256188B2 JP 56053618 A JP56053618 A JP 56053618A JP 5361881 A JP5361881 A JP 5361881A JP H0256188 B2 JPH0256188 B2 JP H0256188B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- corrosion resistance
- inconel
- based alloy
- welded
- 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.)
- Expired - Lifetime
Links
- 238000005260 corrosion Methods 0.000 claims description 41
- 230000007797 corrosion Effects 0.000 claims description 41
- 238000003466 welding Methods 0.000 claims description 27
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- 239000000956 alloy Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 229910001026 inconel Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 229910001055 inconels 600 Inorganic materials 0.000 claims description 10
- 239000006104 solid solution Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims 1
- 230000006641 stabilisation Effects 0.000 description 12
- 238000011105 stabilization Methods 0.000 description 12
- 238000011282 treatment Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
Description
【発明の詳細な説明】
本発明はオーステナイト系固溶強化型高Ni基
合金部材の溶接方法に係り、特に溶接熱影響部の
耐食性および耐応力腐食割れ性を改善するのに好
適な溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding method for austenitic solid solution strengthened high Ni-based alloy members, and particularly to a welding method suitable for improving the corrosion resistance and stress corrosion cracking resistance of a weld heat affected zone. .
オーステナイト系固溶強化型高Ni基合金、た
とえばインコネル600（75Ni―15Cr―8Fe）は非酸
化性環境下における耐食性とCrによる酸化性環
境下における耐食性とを兼ね備えており、またオ
ーステナイト系ステンレス鋼の決定的な弱点であ
る塩化物による応力腐食割れに対しても優れた抵
抗力がある。したがつて高い信頼性が要求される
装置の構造材料としてインコネル600が使用され
ている。 Austenitic solid solution strengthened high Ni-based alloys, such as Inconel 600 (75Ni-15Cr-8Fe), have both corrosion resistance in non-oxidizing environments and corrosion resistance in oxidizing environments due to Cr. It also has excellent resistance to stress corrosion cracking caused by chlorides, which is a critical weakness. Inconel 600 is therefore used as a structural material for devices that require high reliability.
このようにオーステナイト系固溶強化型高Ni
基合金は耐食性に優れているが、この合金の溶接
部が腐食環境下にさらされた場合、溶接熱影響部
が選択的に腐食又は応力腐食割れを発生し、耐食
性が損われる。したがつて溶接熱影響部を含む溶
接部の耐食性を向上させることが望まれている。 In this way, austenitic solid solution strengthened high Ni
The base alloy has excellent corrosion resistance, but when a welded part of this alloy is exposed to a corrosive environment, the weld heat affected zone selectively undergoes corrosion or stress corrosion cracking, and the corrosion resistance is impaired. Therefore, it is desired to improve the corrosion resistance of welds including the weld heat affected zone.
本発明の目的は、耐食性および耐応力腐食割れ
性に優れたオーステナイト系固溶強化型高Ni基
合金の溶接部を得ることができる溶接方法を提供
することにある。 An object of the present invention is to provide a welding method capable of obtaining a welded part of an austenitic solid solution strengthened high Ni-based alloy having excellent corrosion resistance and stress corrosion cracking resistance.
本発明は、オーステナイト系固溶強化型高Ni
基合金部材の溶接方法において、ここの合金部材
を溶接する際に溶接熱影響部に相当する個所に予
めNbおよび／又はTiを含むNi基合金から溶着金
属を肉盛溶接し、次いで耐食性改善熱処理による
安定化処理したオーステナイト系固溶強化型高
Ni基合金部材を同種又異種の部材と溶接するこ
とによつて上記目的を達成したものである。 The present invention is an austenitic solid solution strengthened high Ni
In the welding method for base alloy members, when welding these alloy members, weld metal is deposited in advance from a Ni base alloy containing Nb and/or Ti to the location corresponding to the weld heat affected zone, and then heat treatment is performed to improve corrosion resistance. Austenitic solid solution reinforced type stabilized by
The above object is achieved by welding a Ni-based alloy member with members of the same or different types.
以下、本発明を実施例に基づいて詳細に説明す
る。 Hereinafter, the present invention will be explained in detail based on examples.
第１図は本発明の一例を示す溶接部の断面構造
を示し、この溶接構造物はインコネル600のスリ
ーブ１を圧力容器２に固定したものであつて次の
手順で作製される。すなわち、圧力容器２の内面
側（腐食性環境下にさらされる面側）にはNbお
よび／又はTiを含むインコネルからなる溶着金
属３が肉盛溶接されている。一方インコネル600
からなるスリーブ１には、これを圧力容器２にす
み肉溶接によつて固定する際溶接熱影響部に相当
する部分に予めNbおよび／又はTiを含むインコ
ネル溶着金属４が肉盛溶接される。次いでスリー
ブ１は耐食性改善熱処理による安定化処理が施さ
れる。ここで耐食性改善熱処理は600〜950℃が望
ましい。 FIG. 1 shows a cross-sectional structure of a welded part showing an example of the present invention, and this welded structure is made by fixing a sleeve 1 of Inconel 600 to a pressure vessel 2, and is manufactured by the following procedure. That is, a weld metal 3 made of Inconel containing Nb and/or Ti is overlay welded to the inner surface of the pressure vessel 2 (the surface exposed to a corrosive environment). Meanwhile Inconel 600
When the sleeve 1 is fixed to the pressure vessel 2 by fillet welding, an Inconel weld metal 4 containing Nb and/or Ti is welded in advance to a portion corresponding to the weld heat affected zone. Next, the sleeve 1 is subjected to stabilization treatment by heat treatment for improving corrosion resistance. Here, the heat treatment for improving corrosion resistance is preferably performed at 600 to 950°C.
また、本耐蝕性改善熱処理をスリーブ肉盛溶接
の後に設けることを条件として、本耐蝕性改善熱
処理の段階以前に固溶化処理等の熱処理、本耐蝕
性改善熱処理の段階以後に応力除去焼鈍等の熱処
理を適宜付加し実施しうる。 In addition, on the condition that this heat treatment for improving corrosion resistance is performed after the sleeve build-up welding, heat treatments such as solution treatment may be carried out before the heat treatment for improving corrosion resistance, and stress relief annealing etc. should be carried out after the heat treatment for improving corrosion resistance. Heat treatment can be appropriately added and implemented.
インコネル溶着金属４が肉盛溶接されたスリー
ブ１は前記安定化処理後、圧力容器２と溶接され
るべく配置される。この際、スリーブ１はインコ
ネル溶着金属４の肉盛溶接部分がすみ肉溶接の際
の溶接熱影響部に相当する個所に位置するように
配置される。次いでスリーブ１と圧力容器２とは
所定の方法ですみ肉溶接される。第１図中５はす
み肉溶接部である。 After the stabilization treatment, the sleeve 1 to which the Inconel weld metal 4 has been overlay welded is placed to be welded to the pressure vessel 2. At this time, the sleeve 1 is arranged so that the overlay welded portion of the Inconel weld metal 4 is located at a location corresponding to the weld heat affected zone during fillet welding. The sleeve 1 and the pressure vessel 2 are then fillet welded in a predetermined manner. 5 in Figure 1 is a fillet weld.
本実施例によつて得られた溶接構造物は、圧力
容器の内面側が溶着したときにMC型の炭化物を
形成するNb又はTiの安定化元素を含んでいるの
で耐食性に優れている。一方スリーブ１自体は安
定化処理によつて粒内炭化物が析出されているの
で耐食性に優れ、またスリーブ１側の溶接熱影響
部には予めNbおよび／又はTiを含むインコネル
溶着金属４が肉盛溶接され、MC型の炭化物が形
成されるので溶接熱影響部の耐食性もよい。 The welded structure obtained in this example has excellent corrosion resistance because it contains a stabilizing element such as Nb or Ti that forms MC type carbide when the inner surface of the pressure vessel is welded. On the other hand, the sleeve 1 itself has excellent corrosion resistance because intragranular carbides are precipitated through stabilization treatment, and the weld heat affected zone on the sleeve 1 side is pre-plated with Inconel weld metal 4 containing Nb and/or Ti. Since it is welded and MC type carbide is formed, the corrosion resistance of the weld heat affected zone is also good.
第２図は本発明の他の例を示す溶接部の断面構
造を示し、インコネル600からなる管６を突合せ
溶接したものである。この溶接構造物では管６外
面側（図では管６の上面側）が腐食性環境下にさ
らされる。第２図に示す溶接構造物は、管６を突
合せ溶接する際に溶接熱影響部に相当する部分に
予めNbおよび／又はTiを含むインコネルからな
る溶着金属７が肉盛溶接される。次いで管６は耐
食性改善熱処理による安定化処理が施される。耐
食性改善熱処理条件は上記同様の範囲が望ましい
が、ここでは700℃、20時間とした。インコネル
溶着金属７が肉盛溶接された管６は前記安定化処
理後、突合せ溶接される。第２図中、８は突合せ
溶接部である。 FIG. 2 shows a cross-sectional structure of a welded part showing another example of the present invention, in which a tube 6 made of Inconel 600 is butt welded. In this welded structure, the outer surface side of the tube 6 (in the figure, the upper surface side of the tube 6) is exposed to a corrosive environment. In the welded structure shown in FIG. 2, when the pipes 6 are butt-welded, a deposited metal 7 made of Inconel containing Nb and/or Ti is welded in advance to a portion corresponding to the weld heat-affected zone. The tube 6 is then subjected to stabilization treatment by heat treatment to improve corrosion resistance. The heat treatment conditions for improving corrosion resistance are preferably in the same range as above, but here it was 700°C for 20 hours. The pipe 6 to which the Inconel weld metal 7 has been overlay welded is butt-welded after the stabilization treatment. In FIG. 2, 8 is a butt weld.
本実施例においても、突合せ溶接による熱影響
部を含む管６の外面側の耐食性が優れている。 In this example as well, the corrosion resistance of the outer surface of the tube 6 including the heat-affected zone due to butt welding is excellent.
第３図は本発明のさらに他の例を示す溶接部の
断面構造を示し、耐食性二相ステンレス鋼（例え
ばCF3M）からなる管９と外側にインコネル600
からなる管１０をシール溶接したものである。こ
の溶接構造物では管９，１０の外面側が腐食性環
境下にさらされる。第３図に示す溶接構造物は管
９と管１０とをシール溶接する際に管１０におけ
る溶接熱影響部に相当する部分に予めNbおよ
び／又はTiを含むインコネルから溶着金属１１
が肉盛溶接される。次いで管１０は耐食性改善熱
処理による安定化熱処理による安定化処理が施さ
れる。耐食性改善熱処理条件は700℃、20時間と
した。第３図中、１２はシール溶接部である。 FIG. 3 shows a cross-sectional structure of a welded part showing still another example of the present invention, in which the tube 9 is made of corrosion-resistant duplex stainless steel (for example, CF3M) and the outside is made of Inconel 600.
A tube 10 made of the following is sealed and welded. In this welded structure, the outer surfaces of the tubes 9 and 10 are exposed to a corrosive environment. The welded structure shown in FIG. 3 is constructed by depositing metal 11 from Inconel containing Nb and/or Ti in advance in a portion of the tube 10 corresponding to the weld heat affected zone when seal welding the tubes 9 and 10.
is overlay welded. The tube 10 is then subjected to a stabilization treatment by a stabilization heat treatment by a corrosion resistance improving heat treatment. The heat treatment conditions for improving corrosion resistance were 700°C and 20 hours. In FIG. 3, 12 is a seal weld.
本実施例によれば、溶接熱影響部の耐食性がよ
く、また管９自体の耐食性がよく、さらに管１０
は安定化処理されているので管９，１０の外面側
の耐食性に優れている。 According to this embodiment, the weld heat affected zone has good corrosion resistance, the pipe 9 itself has good corrosion resistance, and the pipe 10 has good corrosion resistance.
Since the tubes 9 and 10 are stabilized, the outer surfaces of the tubes 9 and 10 have excellent corrosion resistance.
本発明において、前記肉盛溶着部及び溶接部に
使用されるNbおよび／又はTiを含むNi基合金と
しては、例えば、ASME，SEC，PartC及び
AWS規格でERNiCr―３として規定されている
商品名インコネル82（TIGワイヤ材）、NiCrFe―
１，NiCrFe―３として規定されている商品イン
コネル182（手溶接棒）あるいはJISG4901NCFに
規定されている高Ni基合金などがあげられる。
さらに、これら材料のNb又はTiのようなMC型
の炭化物を形成する安定化元素の含有原子数と炭
素の含有原子数との比（安定化パラメータ、特願
昭55―100472（特公昭63―56036号公報）参照）
は、耐食性の点から7.5以上が望ましい。 In the present invention, the Ni-based alloy containing Nb and/or Ti used for the overlay weld and welded portion includes, for example, ASME, SEC, Part C and
Product name Inconel 82 (TIG wire material), NiCrFe- specified as ERNiCr-3 in AWS standards
1. Product Inconel 182 (hand welding rod) specified as NiCrFe-3 or high Ni-based alloy specified in JIS G4901NCF are examples.
Furthermore, the ratio of the number of atoms contained in a stabilizing element such as Nb or Ti that forms MC type carbides to the number of atoms contained in carbon (stabilization parameter, (Refer to Publication No. 56036)
is preferably 7.5 or higher from the viewpoint of corrosion resistance.
次に耐食試験によつて本発明の効果を明らかに
する。なお、耐食性は硫酸―硫酸第２鉄腐食試験
法（JIS―GO572）を用い、粒界侵食速度（mm／
ｄ）によつて評価した。この結果、第１図に示す
インコネル600の母材、インコネル溶着金属の肉
盛溶接部およびすみ肉溶接による熱影響部の粒界
侵食速度はそれぞれ約0.06mm／ｄ、約0.04mm／ｄ
および約0.05mm／ｄであり、したがつて管の外面
側の耐食性が優れていることが判明した。因みに
従来法によるすみ肉溶接による熱影響部の粒界侵
食速度は約0.47mm／ｄである。 Next, the effects of the present invention will be clarified through a corrosion resistance test. Corrosion resistance was measured using the sulfuric acid-ferric sulfate corrosion test method (JIS-GO572), and the grain boundary erosion rate (mm/
d) was evaluated. As a result, the grain boundary erosion rates of the base metal of Inconel 600, the overlay weld of Inconel weld metal, and the heat affected zone due to fillet welding shown in Figure 1 are approximately 0.06 mm/d and approximately 0.04 mm/d, respectively.
It was found that the corrosion resistance of the outer surface of the tube was excellent. Incidentally, the grain boundary erosion rate of the heat-affected zone by conventional fillet welding is approximately 0.47 mm/d.
なお、本発明において腐食性環境下にさらされ
るオーステナイト系固溶強化型高Ni基合金は、
これを同種又は異種の部材と溶接する前に安定化
処理が施される。しかし溶接時等に熱処理を受け
ても溶接熱影響部が炭化物を形成する安定化元素
を含んでいるので耐粒界腐食性が劣化することが
ない。また異種材継手のような場合にも安定化処
理することができるとともに安定化処理が容易で
あり、かつ安定化処理コストを低減できる。 In addition, in the present invention, the austenitic solid solution strengthened high Ni-based alloy exposed to a corrosive environment is
A stabilization treatment is performed before this is welded to a member of the same or different type. However, even if heat treatment is applied during welding, intergranular corrosion resistance does not deteriorate because the weld heat affected zone contains stabilizing elements that form carbides. Further, the stabilization process can be performed even in the case of joints made of dissimilar materials, the stabilization process is easy, and the cost of the stabilization process can be reduced.
以上のように本発明によれば、溶接熱影響部の
耐粒界侵食性および耐応力腐食割れ性を著しく向
上させ、信頼性の高い溶接構造物を容易に得るこ
とができる。 As described above, according to the present invention, the intergranular erosion resistance and stress corrosion cracking resistance of the welded heat affected zone can be significantly improved, and a highly reliable welded structure can be easily obtained.
第１図、第２図および第３図はそれぞれ本発明
の実施例を示す溶接部の断面図である。
１……スリーブ（インコネル600）、２……圧力
容器、３，４，７，１１……溶着金属（Nbおよ
び／又はTiを含むインコネル）、５……すみ肉溶
接部、６，１０、……管（インコネル600）、８…
…突合せ溶接部、９……管（耐食性二相ステンレ
ス鋼）、１２……シール溶接部。
FIGS. 1, 2, and 3 are sectional views of welded parts showing embodiments of the present invention, respectively. 1... Sleeve (Inconel 600), 2... Pressure vessel, 3, 4, 7, 11... Weld metal (Inconel containing Nb and/or Ti), 5... Fillet weld, 6, 10,... ...Tube (Inconel 600), 8...
...Butt welded part, 9... Pipe (corrosion-resistant duplex stainless steel), 12... Seal welded part.
Claims (1)
材の溶接方法において、この合金部材を溶接する
際に少なくとも溶接熱影響部に相当する個所に予
めNbおよび／又はTiを含む固溶強化型高Ni基合
金からなる溶着金属を肉盛溶接後、耐食性改善熱
処理による安定化処理したオーステナイト系固溶
強化型高Ni基合金部材を同種又は異種の部材と
溶接することを特徴とする溶接方法。 ２ 特許請求の範囲第１項において、前記オース
テナイト系固溶強化型高Ni基合金部材が、イン
コネル600の管体であり、前記溶着金属がNbおよ
び／又はTiを含むインコネルであることを特徴
とする溶接方法。 ３ 特許請求の範囲第１項又は第２項において、
前記耐食性改善熱処理が600〜950℃の温度による
熱処理であることを特徴とする溶接方法。 ４ 特許請求の範囲第１項、第２項又は第３項の
いずれかにおいて、オーステナイト系固溶強化型
高Ni基合金部材を同種又は異種の部材と溶接す
る方法が、Nbおよび／又はTiを含むNi基合金を
用いたすみ肉溶接、シール溶接又は突合せ溶接の
いずれかの方法であることを特徴とする溶接方
法。[Claims] 1. In a method for welding an austenitic solid solution strengthened high Ni-based alloy member, a solid containing Nb and/or Ti is preliminarily applied to at least a portion corresponding to the weld heat affected zone when welding the alloy member. It is characterized by welding a weld metal made of a solution-strengthened high-Ni-based alloy overlay, and then welding an austenitic solid-solution-strengthened high-Ni-based alloy member stabilized by heat treatment to improve corrosion resistance with members of the same or different types. Welding method. 2. Claim 1 is characterized in that the austenitic solid solution strengthened high Ni-based alloy member is an Inconel 600 tube, and the weld metal is Inconel containing Nb and/or Ti. welding method. 3 In claim 1 or 2,
A welding method characterized in that the corrosion resistance improving heat treatment is heat treatment at a temperature of 600 to 950°C. 4. In any one of claims 1, 2, or 3, the method for welding an austenitic solid solution strengthened high Ni-based alloy member with a member of the same kind or a different kind is provided in which Nb and/or Ti are welded together. A welding method characterized by being any one of fillet welding, seal welding, or butt welding using a Ni-based alloy containing Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5361881A JPS57181773A (en) | 1981-04-09 | 1981-04-09 | Welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5361881A JPS57181773A (en) | 1981-04-09 | 1981-04-09 | Welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57181773A JPS57181773A (en) | 1982-11-09 |
| JPH0256188B2 true JPH0256188B2 (en) | 1990-11-29 |
Family
ID=12947889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5361881A Granted JPS57181773A (en) | 1981-04-09 | 1981-04-09 | Welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57181773A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0516691U (en) * | 1991-08-06 | 1993-03-02 | デイエツクスアンテナ株式会社 | Compact disk case |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52741A (en) * | 1975-06-24 | 1977-01-06 | Babcock Hitachi Kk | Method of welding |
| JPS551981A (en) * | 1979-03-07 | 1980-01-09 | Hitachi Ltd | Weld joint method of stainless steel pipes |
| JPS55145124A (en) * | 1979-04-25 | 1980-11-12 | Us Government | Improvement of physical property of welded article |
-
1981
- 1981-04-09 JP JP5361881A patent/JPS57181773A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52741A (en) * | 1975-06-24 | 1977-01-06 | Babcock Hitachi Kk | Method of welding |
| JPS551981A (en) * | 1979-03-07 | 1980-01-09 | Hitachi Ltd | Weld joint method of stainless steel pipes |
| JPS55145124A (en) * | 1979-04-25 | 1980-11-12 | Us Government | Improvement of physical property of welded article |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0516691U (en) * | 1991-08-06 | 1993-03-02 | デイエツクスアンテナ株式会社 | Compact disk case |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57181773A (en) | 1982-11-09 |
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