JPS6353909B2 - - Google Patents
Info
- Publication number
- JPS6353909B2 JPS6353909B2 JP17659482A JP17659482A JPS6353909B2 JP S6353909 B2 JPS6353909 B2 JP S6353909B2 JP 17659482 A JP17659482 A JP 17659482A JP 17659482 A JP17659482 A JP 17659482A JP S6353909 B2 JPS6353909 B2 JP S6353909B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- tube
- welding
- ferritic stainless
- hardness
- 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
Links
- 229910001220 stainless steel Inorganic materials 0.000 claims description 26
- 238000003466 welding Methods 0.000 claims description 22
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 16
- 238000010790 dilution Methods 0.000 claims description 16
- 239000012895 dilution Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 239000000945 filler Substances 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- 239000000155 melt Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000010959 steel Substances 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0288—Seam welding; Backing means; Inserts for curved planar seams for welding of tubes to tube plates
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】
本発明はフエライト系ステンレス鋼管とオース
テナイト系ステンレス鋼管板とをオーステナイト
系ステンレス溶加棒を用いて溶接する方法に係
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding a ferritic stainless steel pipe and an austenitic stainless steel tube sheet using an austenitic stainless steel filler rod.
フエライト系ステンレス鋼管をオーステナイト
系ステンレス鋼管板孔に挿入し管端を管板に溶接
固定する場合、管板孔の管挿入背側に開先を形成
した上管端を管板背側に突出させて、オーステナ
イト系ステンレス溶加棒を用いて溶接すると、溶
加棒の溶融とともに開先部に突出されたフエライ
ト系ステンレス鋼管が溶融され、溶融金属はフエ
ライト系ステンレス鋼管が多量に溶け込み、フエ
ライト系ステンレス鋼管の希釈率40〜60％程度の
フエライト−オーステナイトの２相合金となり、
その硬さはビツカース硬度で270〜300を示す非常
に硬いものとなる。 When inserting a ferritic stainless steel pipe into a hole in an austenitic stainless steel tube sheet and welding the tube end to the tube sheet, the upper tube end with a groove formed on the back side of the tube sheet hole where the tube is inserted should protrude to the back side of the tube sheet. When welding is performed using an austenitic stainless steel filler rod, the ferritic stainless steel pipe protruding from the groove is melted as the filler rod melts, and a large amount of the ferritic stainless steel pipe melts into the molten metal, and the ferritic stainless steel pipe melts. It becomes a two-phase alloy of ferrite and austenite with a dilution rate of about 40 to 60% for steel pipes.
Its hardness is extremely hard, with a Bitkers hardness of 270 to 300.
なお溶加材としてインコネル系溶加棒を用いた
場合、溶接金属の硬さはビツカース硬度150〜180
程度と低いが高温高圧水素雰囲気における水素誘
起割れを起すことが考えられ、又フエライト系溶
加棒を用いた場合にはビツカース硬さ270〜300の
硬度とともに溶融金属の靭性が低くなる。 When using an Inconel filler rod as the filler metal, the hardness of the weld metal is 150 to 180 on the Bitkers hardness scale.
Hydrogen-induced cracking in a high-temperature, high-pressure hydrogen atmosphere is thought to occur, although to a lesser extent, and when a ferrite-based filler rod is used, the toughness of the molten metal decreases with a Vickers hardness of 270 to 300.
本発明は上記事情に鑑み、フエライト系ステン
レス鋼管とオーステナイト系ステンレス鋼管板の
溶接において、オーステナイト系ステンレス溶加
棒を用いて溶接し溶接金属の硬度をビツカース硬
さ250以下にすることを目的とし、フエライト系
ステンレス鋼管をオーステナイト系ステンレス鋼
管板孔に挿入し溶接するにあたり、管端位置を、
管板孔の管挿入背側に設けた開先の底部とほゞ一
致させ、オーステナイト系ステンレス溶加棒を用
いて溶接し、フエライト系ステンレス鋼管の希釈
率を30％以下にすることを特徴とする管と管板の
溶接方法を提供する。 In view of the above circumstances, the present invention aims to weld a ferritic stainless steel pipe and an austenitic stainless steel tube sheet using an austenitic stainless steel filler rod to reduce the hardness of the weld metal to a Vickers hardness of 250 or less, When inserting and welding a ferritic stainless steel pipe into an austenitic stainless steel pipe plate hole, the position of the pipe end should be
It is characterized by aligning the bottom of the groove provided on the back side of the tube sheet hole where the tube is inserted, and welding using an austenitic stainless steel filler rod to reduce the dilution rate of the ferritic stainless steel tube to 30% or less. Provides a method for welding tubes and tube sheets.
本発明溶接方法においては、このようにフエラ
イト系ステンレス鋼管の希釈率が30％以下となる
ので、ビツカース硬さは250以下となり、かつ靭
性も充分に保つことができる。 In the welding method of the present invention, the dilution ratio of the ferritic stainless steel pipe is 30% or less, so the Vickers hardness is 250 or less, and sufficient toughness can be maintained.
本発明方法を第１図に示す実施例について説明
する。 The method of the present invention will be described with reference to an embodiment shown in FIG.
第１図ａは本発明による溶接中、ｂは溶接後の
状況を、それぞれ示す。図において、１はフエラ
イト系ステンレス鋼管、２はオーステナイト系ス
テンレス鋼管板、２′はその管板孔、３は管板孔
２′の管挿入背側に設けられた開先、４はオース
テナイト系ステンレス溶加棒、５はタングステン
電極、６はアーク、７は溶接金属、８は溶接金属
中に溶融して希釈されたフエライト系ステンレス
鋼管の量を示す。 FIG. 1a shows the situation during welding according to the present invention, and FIG. 1b shows the situation after welding. In the figure, 1 is a ferritic stainless steel pipe, 2 is an austenitic stainless steel tube sheet, 2' is a hole in the tube sheet, 3 is a groove provided on the back side of the tube sheet hole 2', and 4 is an austenitic stainless steel tube. 5 shows the filler rod, 5 shows the tungsten electrode, 6 shows the arc, 7 shows the weld metal, and 8 shows the amount of the ferritic stainless steel pipe melted and diluted in the weld metal.
このような構成において、先ず管１と管板２の
溶接において溶接部ののど厚を十分確保するため
に管板２には開先３が機械加工にて設けられる。
そして本発明では管の希釈率を低くするために管
１の先端位置を開先３のほぼ底位置に配する。管
板２とタングステン電極５の間に図示しない溶接
電源から通電するとアーク６が発生する。 In such a configuration, first, in welding the tube 1 and the tube sheet 2, a groove 3 is provided in the tube sheet 2 by machining in order to ensure a sufficient throat thickness at the welded portion.
In the present invention, the tip of the tube 1 is placed almost at the bottom of the groove 3 in order to reduce the dilution rate of the tube. When electricity is applied between the tube sheet 2 and the tungsten electrode 5 from a welding power source (not shown), an arc 6 is generated.
この時タングステン電極５の位置が管１にあま
りにも近いと管１の希釈が増大するので、溶接が
健全に行なえる範囲内でタングステン電極５は管
１からできるだけ遠い位置が望ましい。又溶加棒
４はアーク６によつて溶融されるとともに管１の
表面が溶融して健全な溶融が行なえる範囲内で管
１の溶融をできるだけ少なくするために、管１に
近い位置に配せられる。 At this time, if the tungsten electrode 5 is located too close to the tube 1, dilution of the tube 1 will increase, so it is desirable that the tungsten electrode 5 be located as far away from the tube 1 as possible within a range that allows sound welding. Further, the filler rod 4 is placed close to the tube 1 in order to minimize melting of the tube 1 within a range where the surface of the tube 1 is melted by the arc 6 and healthy melting can be achieved. be given
このようにして溶融された溶接部は健全な溶接
金属７が得られる。ここで溶接金属はオーステナ
イト系ステンレス溶加棒４およびオーステナイト
系ステンレス鋼管板２の一部およびフエライト系
ステンレス鋼管１が溶融、凝固し、いわゆるオー
ステナイト＋フエライトの２相合金となる。ここ
で本発明においてはフエライト系ステンレス鋼管
の溶融希釈を少なくしているためその量は図示し
た希釈量８となり、オーステナイト＋フエライト
の２相合金のうちフエライトのパーセントを30％
以下としている。 A sound weld metal 7 is obtained from the welded portion melted in this manner. Here, the weld metal is the austenitic stainless steel filler rod 4, a part of the austenitic stainless steel tube sheet 2, and the ferritic stainless steel tube 1, which are melted and solidified to form a so-called two-phase alloy of austenite and ferrite. Here, in the present invention, since the melt dilution of the ferritic stainless steel pipe is reduced, the dilution amount is 8 as shown in the figure, and the percentage of ferrite in the two-phase alloy of austenite + ferrite is reduced to 30%.
It is as follows.
次にフエライト系ステンレス鋼の希釈率を30％
以下とする理由を第２図について説明する。 Next, the dilution rate of ferritic stainless steel is 30%.
The reason for the following will be explained with reference to FIG.
第２図はフエライト系ステンレス鋼
（ASTMA268XM27）にオーステナイト系溶加棒
（AWS.ER309L）を用いて溶接しフエライト系ス
テンレス鋼の希釈を種々変化させた場合の溶接金
属の硬度測定結果である。 Figure 2 shows the hardness measurement results of weld metal when welding ferritic stainless steel (ASTMA268XM27) using an austenitic filler rod (AWS.ER309L) and varying the dilution of the ferritic stainless steel.
完全なフエライト（この場合は溶加棒を送らず
フエライト系ステンレス鋼をTIGでなめづけし
た）および完全なオーステナイト（この場合は
304Lオーステナイトステンレス鋼板にオーステ
ナイト系溶加棒を用いて溶接………なお厳密には
この溶接部には数％のフエライトが含有されるが
フエライト系ステンレス鋼の希釈を論ずるために
ここではオーステナイト100％とした）の状態で
は、硬さは両者とも低いが、オーステナイト＋フ
エライトの２層合金になると硬さが高くなり、フ
エライト50〜60％でビツカース硬さ270〜300程度
となる。 Fully ferrite (in this case, the ferritic stainless steel was TIG tanned without sending a filler rod) and completely austenitic (in this case, the ferritic stainless steel was tanned with TIG).
Welding a 304L austenitic stainless steel plate using an austenitic filler rod...Strictly speaking, this welded part contains a few percent of ferrite, but in order to discuss the dilution of the ferritic stainless steel, we will use 100% austenite here. ), both have low hardness, but when it becomes a two-layer alloy of austenite and ferrite, the hardness increases, with 50 to 60% ferrite having a Vickers hardness of about 270 to 300.
なお硬さを低くするためにはフエライト系ステ
ンレスの希釈を少なくするかあるいは非常に多く
するか両者の方法があるが、フエライトの希釈を
多くするとＮ、Ｃ、の含有によつては溶接部の靭
性が劣下するので、ビツカース硬さを250以下に
し、かつ溶接部に十分な靭性を持たせるために、
フエライト系ステンレス鋼の希釈を30％以下にす
る必要がある。 In order to lower the hardness, there are two ways to dilute the ferritic stainless steel: reduce the dilution of the ferritic stainless steel, or increase the dilution to a very large amount. Since the toughness deteriorates, in order to reduce the Bitkers hardness to 250 or less and provide sufficient toughness to the welded part,
It is necessary to reduce the dilution of ferritic stainless steel to 30% or less.
以下に本発明方法の具体的実施例について述べ
る。 Specific examples of the method of the present invention will be described below.
第３図に示す開先形状で次の溶接条件で溶接し
た。 Welding was carried out using the groove shape shown in Figure 3 under the following welding conditions.
すなわち管はASTMA268XM27材で、外径
25.4φ、板厚1.6mmとし、管板はSUS304L材とし、
溶接ワイヤは１層目309L、２層目308Lの0.8mm
TIG用ワイヤとし、溶接ワイヤを管と管板の境界
部に配し、又タングステン電極は開先端部直上１
mmの所に配し、１層目100A、２層目115Aで自動
溶接した。 In other words, the tube is made of ASTMA268XM27 material, and the outer diameter
25.4φ, plate thickness 1.6mm, tube plate made of SUS304L material,
The welding wire is 0.8mm, 309L for the first layer and 308L for the second layer.
A welding wire is placed at the boundary between the tube and the tube sheet, and a tungsten electrode is placed at the 1st point just above the open tip.
mm and automatically welded at 100A for the first layer and 115A for the second layer.
溶接後の断面マクロ検査によりXM27管の溶接
金属への希釈は約20％であることが判り、硬さも
ビツカース硬度230程度であつた。又溶接のど厚
は約２mmであつた。 A cross-sectional macroscopic inspection after welding revealed that the dilution of the XM27 pipe into the weld metal was approximately 20%, and the hardness was approximately 230 on the Vickers scale. Also, the weld throat thickness was approximately 2 mm.
第１図は本発明方法の一実施例の要領図、第２
図は本発明方法におけるフエライト系ステンレス
鋼の希釈率を説明する図表、第３図は本発明方法
の実験例の開先説明図である。
１：フエライト系ステンレス鋼管、２：オース
テナイト系ステンレス鋼管板、２′：管板孔、
３：開先、４：オーステナイト系ステンレス溶加
棒、７：溶接金属。
Fig. 1 is a schematic diagram of one embodiment of the method of the present invention;
The figure is a chart explaining the dilution rate of ferritic stainless steel in the method of the present invention, and FIG. 3 is a diagram illustrating a bevel in an experimental example of the method of the present invention. 1: Ferritic stainless steel pipe, 2: Austenitic stainless steel tube sheet, 2': Tube sheet hole,
3: Groove, 4: Austenitic stainless steel filler rod, 7: Weld metal.
Claims (1)
ト系ステンレス鋼管板孔に挿入し溶接するにあた
り、管端位置を、管板孔の管挿入背側に設けた開
先の底部とほゞ一致させ、オーステナイト系ステ
ンレス溶加棒を用いて溶接し、フエライト系ステ
ンレス鋼管の希釈率を30％以下にすることを特徴
とする管と管板の溶接方法。1. When inserting and welding a ferritic stainless steel pipe into an austenitic stainless steel tube plate hole, align the tube end position with the bottom of the groove provided on the back side of the tube plate hole where the tube is inserted, and A method for welding pipes and tube sheets, characterized by welding using a rod and keeping the dilution ratio of ferritic stainless steel pipes to 30% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17659482A JPS5966982A (en) | 1982-10-07 | 1982-10-07 | Welding method of pipe and pipe plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17659482A JPS5966982A (en) | 1982-10-07 | 1982-10-07 | Welding method of pipe and pipe plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5966982A JPS5966982A (en) | 1984-04-16 |
| JPS6353909B2 true JPS6353909B2 (en) | 1988-10-26 |
Family
ID=16016295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17659482A Granted JPS5966982A (en) | 1982-10-07 | 1982-10-07 | Welding method of pipe and pipe plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5966982A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4526096B1 (en) * | 2009-12-08 | 2010-08-18 | 有限会社奥戸溶接 | Fire extinguisher |
| CN111390339B (en) * | 2020-04-04 | 2021-10-29 | 天津津滨石化设备有限公司 | Welding process of high-purity ferrite stainless steel heat exchanger |
-
1982
- 1982-10-07 JP JP17659482A patent/JPS5966982A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5966982A (en) | 1984-04-16 |
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