JPH04185989A - Manufacture of supply pipe line for water paint - Google Patents
Manufacture of supply pipe line for water paintInfo
- Publication number
- JPH04185989A JPH04185989A JP31249690A JP31249690A JPH04185989A JP H04185989 A JPH04185989 A JP H04185989A JP 31249690 A JP31249690 A JP 31249690A JP 31249690 A JP31249690 A JP 31249690A JP H04185989 A JPH04185989 A JP H04185989A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- nitric acid
- welding
- steel pipes
- welding part
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000003973 paint Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000003466 welding Methods 0.000 claims abstract description 34
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 20
- 239000010935 stainless steel Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 12
- 238000002161 passivation Methods 0.000 claims abstract description 8
- 238000007598 dipping method Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 3
- 239000012670 alkaline solution Substances 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Arc Welding In General (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】 Ａ０発明の目的 （１）産業上の利用分野 本発明は水性塗料用供給管路の製作方法に関する。[Detailed description of the invention] A0 Purpose of invention (1) Industrial application fields The present invention relates to a method of manufacturing a supply conduit for water-based paint.
（２）従来の技術
この種供給管路用構成管としては、水による腐食を考慮
してステンレス鋼管が用いられている。(2) Prior Art Stainless steel pipes are used as component pipes for this type of supply pipe in consideration of corrosion caused by water.
ステンレス鋼管相互の接合に当っては各種管継手が用い
られているが、施工場所等の制約からそれら管継手を用
いることができない場合にはステンレス鋼管相互を溶接
しなければならない。Various types of pipe joints are used to join stainless steel pipes to each other, but if these pipe joints cannot be used due to constraints such as the construction site, the stainless steel pipes must be welded together.
このような場合の簡便な溶接法としては被覆アーク溶接
法の適用が考えられるが、この溶接法は溶接部の耐食性
の劣化を防止する上でやや難点があるため、従来は、耐
食性の良好な溶接部を得ることのできるイナートガスア
ーク溶接法を適用している。A simple welding method in such cases is covered arc welding, but since this welding method has some drawbacks in preventing deterioration of the corrosion resistance of the weld, conventionally The inert gas arc welding method is used to obtain welded parts.
（３）発明が解決しようとする課題
しかしながらイナートガスアーク溶接法においては、イ
ナートガスを含めた設備コストが高いため前記供給管路
の製作コストが高くなる、といった問題がある。(3) Problems to be Solved by the Invention However, in the inert gas arc welding method, there is a problem that the production cost of the supply pipe becomes high because the equipment cost including the inert gas is high.
本発明は前記に鑑み、簡便な被覆アーク溶接法を適用し
、その適用による不具合を二次的な処理により回避して
水性塗料用供給管路の製作コストを低減し得るようにし
た前記製作方法を提供することを目的とする。In view of the above, the present invention applies a simple covered arc welding method, avoids problems caused by the application through secondary processing, and reduces the manufacturing cost of a supply pipe for water-based paint. The purpose is to provide
Ｂ０発明の構成
（１）課題を解決するための手段
本発明に係る水性塗料用供給管路の製作方法は、ステン
レス鋼管相互を被覆アーク溶接法により溶接し、次いで
前記ステンレス鋼管の溶接部に、硝酸への浸漬工程を含
む不動態化処理を施すことを特徴とする。B0 Structure of the Invention (1) Means for Solving the Problems The method for manufacturing a water-based paint supply pipe according to the present invention includes welding stainless steel pipes to each other by a covered arc welding method, and then joining the welded portions of the stainless steel pipes to each other by welding the pipes together. It is characterized by a passivation treatment including a step of dipping in nitric acid.
（２）作 用
前記のように、被覆アーク溶接法を適用すると、溶接装
置が安価であると共にその可搬性が良いので現場での作
業性が向上する。(2) Effects As described above, when the coated arc welding method is applied, the welding equipment is inexpensive and has good portability, improving workability on site.
また被覆アーク溶接法の適用下では溶接部の耐食性が劣
化し易いが、その溶接部には前記不動態化処理が施され
るので、耐食性の問題は回避される。Further, when the covered arc welding method is applied, the corrosion resistance of the welded portion is likely to deteriorate, but since the welded portion is subjected to the above-mentioned passivation treatment, the problem of corrosion resistance is avoided.
（３）実施例
第１図は水溶性塗料用供給管路１における２本のステン
レス鋼管２１．２！の溶接継手を示す。(3) Example Figure 1 shows two stainless steel pipes 21.2 in the water-soluble paint supply pipeline 1! shows a welded joint.
ステンレス鋼管２１．２２としては、主として耐食性に
優れたオーステナイ系ステンレス鋼、例えばＪＩＳ
５ＵＳ３０４．５ＵＳ３１６等よりなる鋼管が用いられ
る。The stainless steel pipes 21 and 22 are mainly made of austenitic stainless steel with excellent corrosion resistance, such as JIS
A steel pipe made of 5US304.5US316 or the like is used.
両ステンレス鋼管２８．２ｚの溶接に当っては、被覆ア
ーク溶接法が適用されるが、その際溶接棒の心線として
は、それら鋼管の組成に近いものを選択するのが望まし
い。例えば、ステンレス鋼管２８，２２の鋼種がＪＩＳ
５ＵＳ３０４の場合は、心線としてＪＩＳ Ｄ３
０Ｂより構成されたものを、またステンレス鋼管２Ｉ、
２２の鋼種がＪＩＳ ５ＵＳ３１６の場合は、心線と
してＪＩＳ Ｄ３１６より構成されたものを用いる。When welding both stainless steel pipes 28.2z, a covered arc welding method is applied, and in this case, it is desirable to select a core wire of a welding rod that is close in composition to those steel pipes. For example, the steel type of stainless steel pipes 28 and 22 is JIS
In the case of 5US304, JIS D3 is used as the core wire.
0B, stainless steel pipe 2I,
When the steel type of No. 22 is JIS 5US316, a core wire made of JIS D316 is used.
第２図に明示するように、両ステンレス鋼管２１．２２
の端面相互を突合せて被覆アーク溶接を行った場合、溶
着金属３およびその近傍を含む溶接部４において、特に
溶着金属４の、それより若干離れた両側に、炭化物の粒
界析出に起因して腐食性環境下で容易に腐食されやすい
領域５が発生する。Both stainless steel tubes 21 and 22 are shown clearly in Figure 2.
When shielded arc welding is performed by butting the end faces of the two, in the welded part 4 including the weld metal 3 and its vicinity, especially on both sides of the weld metal 4 slightly apart from it, carbide precipitation occurs at grain boundaries. A region 5 is generated that is easily corroded in a corrosive environment.
そこで、溶接後の二次的処理として、特に、両頭域５の
耐食性を向上させるべく、溶接部４に不・動態化処理を
施すものである。Therefore, as a secondary treatment after welding, the welded portion 4 is subjected to passivation treatment in order to particularly improve the corrosion resistance of the double-headed region 5.
その不動態化処理は、以下の各工程順に行われる。The passivation treatment is performed in the following steps.
（１） 溶接部４をシンナ、リン酸等の洗浄液中に浸漬
して溶接部４に付着している油分等の汚れを除去する。(1) Immerse the welded part 4 in a cleaning liquid such as thinner or phosphoric acid to remove oil and other stains adhering to the welded part 4.
（ｉ：） 溶接部４を、常温または５０°Ｃ程度に加
熱された１５〜２５％硝酸に浸漬する。浸漬時間は、硝
酸が常温である場合には４０〜６０分間に、また加温さ
れている場合には２０〜３０分間にそれぞれ設定される
。(i:) The welded part 4 is immersed in 15 to 25% nitric acid heated to room temperature or about 50°C. The immersion time is set to 40 to 60 minutes when the nitric acid is at room temperature, and 20 to 30 minutes when it is heated.
（ｆｉｉ） 溶接部４を水洗して硝酸を除去する。(fii) Wash the welded part 4 with water to remove nitric acid.
（ｉｖ） 溶接部４を水酸化ナトリウム等のアルカリ
性溶液により洗浄して残留硝酸を中和する。(iv) Clean the welded part 4 with an alkaline solution such as sodium hydroxide to neutralize residual nitric acid.
外径４２．７ｍ、厚さ１．６５ｍ（７）ＪＩＳ ５Ｕ
Ｓ３０４より構成された２本のステンレス鋼管２Ｉ、２
２の端面相互を突合せ、ＪＩＳ Ｄ３０８よりなる心
線を備えた溶接棒を用いて被覆アーク溶接を行った。Outer diameter 42.7m, thickness 1.65m (7) JIS 5U
Two stainless steel pipes 2I, 2 made of S304
The two end faces were butted against each other, and covered arc welding was performed using a welding rod equipped with a core wire made of JIS D308.
次いで、溶接部４をシンナにより洗浄する、溶接部４を
常温の２０％硝酸に６０分間浸漬する、溶接部４を水洗
する、溶接部４を常温の１％水酸化ナトリウム溶液によ
り洗浄する、といった各作業を行って溶接部４に不動態
化処理を施した。Next, the welded part 4 was cleaned with thinner, the welded part 4 was immersed in 20% nitric acid at room temperature for 60 minutes, the welded part 4 was washed with water, and the welded part 4 was cleaned with a 1% sodium hydroxide solution at room temperature. Each operation was performed to passivate the welded portion 4.
このような溶接部４を有する供給管路１により水性塗料
（関西ペイント社製、エマルジョン型アクリルメラミン
樹脂塗料）の供給を行ったところ、６ケ月経過後におい
ても溶接部４には錆等の腐食の発生は認められなかった
。When a water-based paint (manufactured by Kansai Paint Co., Ltd., emulsion type acrylic melamine resin paint) was supplied through the supply pipe 1 having such a welded part 4, corrosion such as rust was observed in the welded part 4 even after 6 months. No occurrence was observed.
外径４２．７ ｗｔａ、厚さ１．６５＋ｗ＋のＪＩＳ
５ＵＳ３１６より構成された２本のステンレス鋼管２
１．２ｚの端面相互を突合せ、ＪＩＳ Ｄ３１６よう
なる心線を備えた溶接棒を用いて被覆アーク溶接を行っ
た。JIS outer diameter 42.7 wta, thickness 1.65+w+
Two stainless steel tubes 2 made of 5US316
The end faces of 1.2z were abutted against each other, and covered arc welding was performed using a welding rod with a core wire according to JIS D316.
次いで、溶接部４を１％リン酸溶液により洗浄する、溶
接部４を５０°Ｃの２０％硝酸に３０分間浸漬する、溶
接部４を水洗する、溶接部４を常温の１％水酸化ナトリ
ウム溶液により洗浄する、といった各作業を行って溶接
部４に不動態化処理を施した。Next, the weld 4 is cleaned with a 1% phosphoric acid solution, the weld 4 is immersed in 20% nitric acid at 50°C for 30 minutes, the weld 4 is washed with water, and the weld 4 is soaked in 1% sodium hydroxide at room temperature. The welded portion 4 was subjected to passivation treatment by performing various operations such as cleaning with a solution.
このような溶接部４を有する供給管路１により、実施例
■と同様の水性塗料の供給を行ったところ、６ケ月経過
後においても溶接部４には錆等の腐食の発生は認められ
なかった。When water-based paint was supplied in the same manner as in Example ① through the supply pipe 1 having such a welded part 4, no corrosion such as rust was observed in the welded part 4 even after 6 months had passed. Ta.
外径４２．７ｍ、厚さ１．６５＋＋ｏのＪＩＳ ５Ｕ
Ｓ３０４より構成された２本のステンレス鋼管２゜、２
２の端面相互を突合せ、ＪＩＳ Ｄ３０Ｂよりなる心
線を備えた溶接棒を用いて被覆アーク溶接を行い、次い
で、溶接部４をシンナにより洗浄した。JIS 5U with outer diameter 42.7m and thickness 1.65++o
Two stainless steel tubes 2° and 2 made of S304
The end surfaces of 2 were butted together, and covered arc welding was performed using a welding rod with a core made of JIS D30B, and then the welded portion 4 was cleaned with thinner.
このような溶接部４を有する供給管路１により、実施例
Ｉと同様の水性塗料の供給を行ったところ、２週間経過
後において溶接部４に錆の発生が認められた。When the same water-based paint as in Example I was supplied through the supply conduit 1 having such a welded part 4, rust was observed in the welded part 4 after two weeks had elapsed.
Ｃ０発明の効果
本発明によれば、簡便な溶接法と簡単な二次的処理法の
採用とによって、優れた耐食性を有する溶接部を備えた
水性塗料用供給管路を安価に提供することができる。C0 Effects of the Invention According to the present invention, by employing a simple welding method and a simple secondary treatment method, it is possible to provide a water-based paint supply pipe with a welded portion having excellent corrosion resistance at a low cost. can.
第１図は水性塗料用供給管路の要部斜視図、第２図はそ
の要部断面図である。
２＋、２ｔ・・・ステンレス鋼管、４・・・溶接部第１
図
第２図FIG. 1 is a perspective view of a main part of a supply pipe for water-based paint, and FIG. 2 is a sectional view of the main part. 2+, 2t...Stainless steel pipe, 4...Welded part 1st
Figure 2
Claims (1)
溶接法により溶接し、次いで前記ステンレス鋼管（２＿
１，２＿２）の溶接部（４）に、硝酸への浸漬工程を含
む不動態化処理を施すことを特徴とする水性塗料用供給
管路の製作方法。The stainless steel pipes (2_1, 2_2) are welded together by covered arc welding, and then the stainless steel pipes (2_1, 2_2)
1, 2_2) A method for manufacturing a supply pipe for water-based paint, characterized in that the welded portion (4) of step 2 is subjected to passivation treatment including a step of dipping in nitric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31249690A JP2651745B2 (en) | 1990-11-16 | 1990-11-16 | Method of manufacturing supply pipe for water-based paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31249690A JP2651745B2 (en) | 1990-11-16 | 1990-11-16 | Method of manufacturing supply pipe for water-based paint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04185989A true JPH04185989A (en) | 1992-07-02 |
| JP2651745B2 JP2651745B2 (en) | 1997-09-10 |
Family
ID=18029918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31249690A Expired - Fee Related JP2651745B2 (en) | 1990-11-16 | 1990-11-16 | Method of manufacturing supply pipe for water-based paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2651745B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104220640A (en) * | 2012-04-13 | 2014-12-17 | 杰富意钢铁株式会社 | Method for chemically converting steel member, method for manufacturing coated steel member having been electrodeposition-coated, and coated steel member |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103133790A (en) * | 2011-11-25 | 2013-06-05 | 江苏海德节能科技有限公司 | Butt welding galvanized elbow |
-
1990
- 1990-11-16 JP JP31249690A patent/JP2651745B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104220640A (en) * | 2012-04-13 | 2014-12-17 | 杰富意钢铁株式会社 | Method for chemically converting steel member, method for manufacturing coated steel member having been electrodeposition-coated, and coated steel member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2651745B2 (en) | 1997-09-10 |
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