JPH0633275A - Backing steel for welding bottom board of tank and corrosion preventing method for bottom board of tank - Google Patents
Backing steel for welding bottom board of tank and corrosion preventing method for bottom board of tankInfo
- Publication number
- JPH0633275A JPH0633275A JP4213192A JP21319292A JPH0633275A JP H0633275 A JPH0633275 A JP H0633275A JP 4213192 A JP4213192 A JP 4213192A JP 21319292 A JP21319292 A JP 21319292A JP H0633275 A JPH0633275 A JP H0633275A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- bottom plate
- tank bottom
- tank
- backing steel
- 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.)
- Granted
Links
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、基礎土上に構築される
原油、石油等を貯蔵するタンクの底板溶接用裏当て鋼材
およびタンク底板の防食方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing steel material for welding a bottom plate of a tank for storing crude oil, petroleum, etc. constructed on a foundation soil and a method for preventing corrosion of a tank bottom plate.
【０００２】[0002]
【従来の技術】タンク底板は、オイルサンド等の基礎土
上で鋼板を突き合わせ溶接することにより製作されるも
のであるが、特に底板裏面は基礎土に含まれる水分、酸
素等により腐食が生じやすい。金属めっきあるいは金属
溶射を施した鋼板でタンク底板をつくる場合にも、溶接
部裏面が溶接によって損傷し、腐食が生じる問題があっ
た。このため従来よりタンク底板の腐食を防止するため
の防食法が種々実施されており、そのひとつとして電気
防食法が古くから実施されてきた。2. Description of the Related Art A tank bottom plate is manufactured by butt-welding a steel plate on a base soil such as oil sand. Particularly, the back surface of the bottom plate is apt to be corroded by moisture, oxygen, etc. contained in the base soil. . Even when the tank bottom plate is made of a steel plate plated with metal or sprayed with metal, there is a problem that the back surface of the welded portion is damaged by welding and corrosion occurs. Therefore, various anticorrosion methods for preventing the corrosion of the tank bottom plate have been conventionally implemented, and as one of them, the electrocorrosion method has been implemented for a long time.
【０００３】[0003]
【発明が解決しようとする課題】しかし、電気防食法で
は基礎土の電気伝導度が一定しないので、底板全体に均
一に防食電流を流すことが困難であり、そのため局部的
に腐食が進行するなどの欠点があった。また特開昭５９
−１７７３７４号公報に記載されているように、タンク
底板部材の溶接部の下面に低電位金属からなる防食材を
配置し、この防食材を溶接熱で溶融する防食法が開発さ
れた。しかし、この方法では溶接部が低融点金属脆化に
よって脆化する欠点が生じた。本発明の目的は、上述し
た問題点を全て解消し、タンク底板の防食が容易に実施
できるタンク底板溶接用裏当て鋼材およびタンク底板の
防食方法を提供することにある。However, since the electric conductivity of the foundation soil is not constant in the cathodic protection method, it is difficult to apply an anticorrosion current evenly to the entire bottom plate, which causes local corrosion. There was a drawback. In addition, JP-A-59
As described in JP-A-177374, a corrosion prevention method has been developed in which an anticorrosive material made of a low-potential metal is arranged on the lower surface of a welded portion of a tank bottom plate member, and the anticorrosive material is melted by welding heat. However, this method has a drawback that the welded portion is embrittled by the low melting point metal embrittlement. An object of the present invention is to provide a backing steel material for welding a tank bottom plate and a corrosion protection method for a tank bottom plate, which can solve all of the above-mentioned problems and can easily perform the corrosion protection of the tank bottom plate.
【０００４】[0004]
【課題を解決するための手段】本発明は、亜鉛、アルミ
ニウム等の鉄よりも電位的に卑なる金属の一種もしくは
二種以上を被覆した鋼板を溶接してタンク底板を形成す
る際に使用する溶接用裏当て鋼材であり、溶接部に当接
する面の幅方向中央部分を除く全面に、鉄よりも電位的
に卑なる金属を被覆したことを特徴とするタンク底板溶
接用裏当て鋼材にある。さらには、タンク底板と溶接用
裏当て材の間に若干の隙間が生じる場合でも水密性を上
げて、防食が効率的に達成できるようにするため、溶接
部に相当する面に於いて、溶接線に平行して線状に突起
を設けたことを特徴とするタンク底板溶接用裏当て鋼材
である。さらには、被覆材が機械的に損傷を受け、防食
に支障をきたす場合を想定して、かかる場合でも防食で
きるタンク底板溶接用裏当て鋼材であり、鉄よりも電位
的に卑なる金属塊を電気的に接続したタンク底板溶接用
裏当て鋼材、あるいは鉄よりも電位的に卑なる金属塊を
組み込んで一体としたタンク底板溶接用裏当て鋼材であ
る。さらには、亜鉛、アルミニウム等の鉄よりも電位的
に卑なる金属の一種もしくは二種以上を被覆した鋼板を
溶接してタンク底板を形成するにあたり、請求項１〜請
求項４の何れかに記載のタンク底板溶接用裏当て鋼材を
用いることを特徴とするタンク底板の防食方法である。The present invention is used for forming a tank bottom plate by welding a steel plate coated with one or more metals which are more base electric potentials than iron such as zinc and aluminum. It is a backing steel material for welding, and the backing steel material for welding a tank bottom plate is characterized in that the entire surface except the widthwise central part of the surface that abuts the welding part is coated with a metal that is base potential less than iron. . In addition, even if there is a slight gap between the tank bottom plate and the welding backing material, the watertightness is increased so that corrosion protection can be efficiently achieved. A backing steel material for welding a tank bottom plate, characterized in that a linear protrusion is provided in parallel with the line. Furthermore, assuming that the coating material is mechanically damaged and interferes with corrosion prevention, it is a tank back plate welding backing steel material that can prevent corrosion even in such a case. A backing steel material for welding a tank bottom plate that is electrically connected, or a backing steel material for welding a tank bottom plate that is integrated by incorporating a metal ingot that is more base potential than iron. Further, in forming a tank bottom plate by welding a steel plate coated with one or two or more metals that are more base electric potentials than iron such as zinc and aluminum, the tank bottom plate is formed. Is a backing steel material for welding the tank bottom plate, which is characterized in that it is an anticorrosion method for the tank bottom plate.
【０００５】[0005]
【実施例】以下図面を参照して本発明の実施例を詳述す
る。図１は請求項１のタンク底板溶接用裏当て鋼材の一
部を示す斜視図であり、裏当て鋼材１の溶接部直下に当
たる幅６０mmの中央部分２を除いた全面に亜鉛溶射被膜
３を施してある。図２は前記タンク底板溶接用裏当て鋼
材を使用して、タンク底板材４を溶接により接続した状
態を示す部分斜視図である。溶接によりタンク底板材４
と前記裏当て鋼材１とは一体となり、タンク底板材４の
裏面は全面が亜鉛溶射被膜に覆われて防食される。図３
は突起付きのタンク底板溶接用裏当て鋼材１を示す図で
あり、予め溶接部直下に当たる中央部分２の両側に突起
８を形成した鋼板５に、図１に示した裏当て鋼材と同様
に亜鉛溶射被膜３を被覆したものである。図４にこの裏
当て鋼材１を使用した場合の部分断面図を示した。図５
には亜鉛流電陽極６を、芯金７を介して接続した溶接用
裏当て鋼材１の斜視図を示し、図６には亜鉛流電陽極６
と一体化した溶接用裏当て鋼材１の斜視図を示した。こ
のように、本発明による溶接用裏当て鋼材１を用いれ
ば、タンク底面全面を亜鉛被膜で覆うことができ、タン
ク底板裏面は十分に防食される利点がある。また、本発
明の流電陽極を設けた裏当て鋼材を使用すれば、被膜に
損傷が生じた場合でも防食される利点がある。なお、本
発明によれば、溶接時の亜鉛被膜の悪影響は僅かである
ので問題が無いが、溶接前にタンク底板材４の溶接部近
傍の亜鉛被膜を除去しておくと、さらに良い結果が得ら
れる。Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a part of a backing steel material for welding a tank bottom plate according to claim 1, wherein a zinc sprayed coating 3 is applied to the entire surface of the backing steel material 1 excluding a central portion 2 having a width of 60 mm which is directly below a welded portion. There is. FIG. 2 is a partial perspective view showing a state in which the tank bottom plate material 4 is connected by welding using the tank bottom plate welding backing steel material. Tank bottom plate material 4 by welding
And the backing steel material 1 are integrated with each other, and the entire back surface of the tank bottom plate material 4 is covered with a zinc spray coating to prevent corrosion. Figure 3
FIG. 3 is a view showing a backing steel material 1 for welding a tank bottom plate having a projection, in which a steel plate 5 having projections 8 formed on both sides of a central portion 2 which directly hits directly below a welded portion is formed on a steel plate 5 similar to the backing steel material shown in FIG. The thermal spray coating 3 is coated. FIG. 4 shows a partial cross-sectional view when this backing steel material 1 is used. Figure 5
Shows a perspective view of the backing steel material for welding 1 in which a zinc galvanic anode 6 is connected via a core metal 7. FIG.
The perspective view of the backing steel material 1 for welding integrated with was shown. As described above, the use of the welding backing steel material 1 according to the present invention has an advantage that the entire bottom surface of the tank can be covered with the zinc coating, and the back surface of the tank bottom plate is sufficiently corrosion-protected. Further, when the backing steel material provided with the galvanic anode of the present invention is used, there is an advantage that corrosion is prevented even when the coating film is damaged. According to the present invention, since the adverse effect of the zinc coating during welding is slight, there is no problem, but if the zinc coating in the vicinity of the welded portion of the tank bottom plate material 4 is removed before welding, even better results are obtained. can get.
【０００６】なお、ここでは亜鉛溶射被覆した裏当て鋼
材の場合について例示したが、アルミニウム溶射あるい
はアルミ／亜鉛溶射、さらにはこれらのめっき鋼板の場
合でも同様の効果が得られることは言うまでもない。ま
た、突起８を有する裏当て鋼材１の場合、突起８の数は
最低２本が不可欠であるが、さらに多くの突起を設けて
も良い。さらにまた、タンク底板材に突起をつけて溶射
しても、溶射被膜そのもので突起を形成させても得られ
る効果は同様である。Although the case of a backing steel material coated with zinc spray coating has been exemplified here, it goes without saying that the same effect can be obtained in the case of aluminum spray coating or aluminum / zinc spray coating, and also in the case of these plated steel sheets. Further, in the case of the backing steel material 1 having the projections 8, the number of the projections 8 is indispensable to be at least two, but more projections may be provided. Furthermore, the same effect can be obtained even if the tank bottom plate material is provided with projections for thermal spraying or the projections are formed by the thermal spray coating itself.
【０００７】[0007]
【発明の効果】本発明による溶接用裏当て鋼材を用い
て、溶射鋼板を溶接して、タンク底板を構成すると、健
全な溶接ビードが得られるばかりでなく、タンク底板裏
面は全て溶射被膜により覆われるので、タンク底板の裏
面が十分に防食されるという効果が得られる。また流電
陽極を組み込んだ溶接用裏当て鋼材を使用すれば、電気
防食作用により、さらにタンク底板の防食が確実にな
る。したがって、タンク底板の耐用年数を大幅に延長さ
せることができ、かつタンクの安全性確保の点でも極め
て優れた効果を奏する。EFFECTS OF THE INVENTION When a sprayed steel sheet is welded by using the backing steel material for welding according to the present invention to form a tank bottom plate, not only a sound weld bead can be obtained, but also the back surface of the tank bottom plate is entirely covered with a sprayed coating. Therefore, it is possible to obtain an effect that the back surface of the tank bottom plate is sufficiently protected from corrosion. If a backing steel material for welding incorporating a galvanic anode is used, the corrosion protection of the tank bottom plate is further ensured due to the anticorrosion effect. Therefore, the service life of the tank bottom plate can be greatly extended, and an extremely excellent effect can be obtained in terms of ensuring the safety of the tank.
【図面の簡単な説明】[Brief description of drawings]
【図１】請求項１の溶接用裏当て鋼材の斜視図である。FIG. 1 is a perspective view of a backing steel material for welding according to claim 1. FIG.
【図２】請求項１の裏当て鋼材上でタンク底板を溶接し
た状態を示す部分斜視図である。FIG. 2 is a partial perspective view showing a state in which a tank bottom plate is welded on the backing steel material according to claim 1.
【図３】請求項２の溶接用裏当て鋼材の斜視図である。FIG. 3 is a perspective view of a backing steel material for welding according to claim 2;
【図４】請求項２の裏当て鋼材を使用してタンク底板を
溶接した状態を示す部分断面図である。FIG. 4 is a partial cross-sectional view showing a state where a tank bottom plate is welded using the backing steel material of claim 2;
【図５】請求項３の流電陽極付き裏当て鋼材を示す斜視
図である。FIG. 5 is a perspective view showing a backing steel material with a galvanic anode according to claim 3;
【図６】請求項４の流電陽極一体構造の裏当て鋼材を示
す斜視図である。FIG. 6 is a perspective view showing a backing steel material having an integral structure with a galvanic anode according to claim 4;
１ 溶接用裏当て鋼材 ２ 溶射被膜が無い部分 ３ 溶射被膜 ４ タンク底板材 ５ 突起付き鋼板 ６ 亜鉛流電陽極 ７ 芯金 ８ 突起 ９ 溶接ビード 1 Steel material for backing for welding 2 Part without thermal spray coating 3 Thermal spray coating 4 Tank bottom plate 5 Steel plate with protrusions 6 Zinc galvanic anode 7 Core metal 8 Protrusions 9 Weld beads
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２３Ｋ 9/00 ５０１ Ｌ 7920−4Ｅ (72)発明者 中山 正荘 山口県徳山市宮前町１−１ 出光エンジニ アリング株式会社徳山事業所内 (72)発明者 屋敷 孝志 山口県徳山市宮前町１−１ 出光エンジニ アリング株式会社徳山事業所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location // B23K 9/00 501 L 7920-4E (72) Inventor Masazo Nakayama Miyamae Town, Tokuyama City, Yamaguchi Prefecture 1-1 Inside the Tokuyama Plant of Idemitsu Engineering Co., Ltd. (72) Inventor Takashi Yashiki 1-1 Miyamae-cho, Tokuyama City, Yamaguchi Prefecture Inside the Tokuyama Plant of Idemitsu Engineering Co., Ltd.
Claims (5)
に卑なる金属の一種もしくは二種以上を被覆した鋼板を
溶接してタンク底板を形成する際に使用する溶接用裏当
て鋼材であり、溶接部に当接する面の幅方向中央部分を
除く全面に、鉄よりも電位的に卑なる金属を被覆したこ
とを特徴とするタンク底板溶接用裏当て鋼材。1. A welding backing steel material for use in forming a tank bottom plate by welding a steel plate coated with one or more metals that are more base electric potentials than iron such as zinc and aluminum. A backing steel material for welding a tank bottom plate, characterized in that the entire surface of the surface in contact with the welded portion, excluding the central portion in the width direction, is coated with a metal that is less base than iron.
両端部にそれぞれ長手方向に線状に突起を設けたことを
特徴とする請求項１のタンク底板溶接用裏当て鋼材。2. The backing steel material for welding a tank bottom plate according to claim 1, wherein projections are provided linearly in the longitudinal direction on both ends in the width direction of the uncovered surface at the center portion in the width direction.
に接続したことを特徴とする請求項１または請求項２の
タンク底板溶接用裏当て鋼材。3. The backing steel material for welding a tank bottom plate according to claim 1 or 2, wherein a metal block having a potential lower than that of iron is electrically connected.
んで一体としたことを特徴とする請求項１または請求項
２のタンク底板溶接用裏当て鋼材。4. The backing steel material for welding a tank bottom plate according to claim 1 or 2, wherein a metal block having a potential lower than that of iron is incorporated and integrated.
に卑なる金属の一種もしくは二種以上を被覆した鋼板を
溶接してタンク底板を形成する際に、請求項１，２，
３，または４の溶接用裏当て鋼材を用いることを特徴と
するタンク底板の防食方法。5. A tank bottom plate is formed by welding a steel plate coated with one or two or more metals that are more base electric potentials than iron such as zinc and aluminum.
A method for preventing corrosion of a tank bottom plate, which comprises using the backing steel material for welding of 3 or 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213192A JP2662754B2 (en) | 1992-07-20 | 1992-07-20 | Backing steel material for tank bottom plate welding and corrosion prevention method for tank bottom plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4213192A JP2662754B2 (en) | 1992-07-20 | 1992-07-20 | Backing steel material for tank bottom plate welding and corrosion prevention method for tank bottom plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0633275A true JPH0633275A (en) | 1994-02-08 |
| JP2662754B2 JP2662754B2 (en) | 1997-10-15 |
Family
ID=16635066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4213192A Expired - Fee Related JP2662754B2 (en) | 1992-07-20 | 1992-07-20 | Backing steel material for tank bottom plate welding and corrosion prevention method for tank bottom plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2662754B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6470492A (en) * | 1987-08-15 | 1989-03-15 | Hoechst Ag | Substituted thienoimidazole derivative |
-
1992
- 1992-07-20 JP JP4213192A patent/JP2662754B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6470492A (en) * | 1987-08-15 | 1989-03-15 | Hoechst Ag | Substituted thienoimidazole derivative |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2662754B2 (en) | 1997-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970506 |
|
| LAPS | Cancellation because of no payment of annual fees |