JPH02225654A - Production of metallic pipe - Google Patents
Production of metallic pipeInfo
- Publication number
- JPH02225654A JPH02225654A JP1044195A JP4419589A JPH02225654A JP H02225654 A JPH02225654 A JP H02225654A JP 1044195 A JP1044195 A JP 1044195A JP 4419589 A JP4419589 A JP 4419589A JP H02225654 A JPH02225654 A JP H02225654A
- Authority
- JP
- Japan
- Prior art keywords
- weld zone
- metal
- metal plate
- zone
- pipe
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 abstract description 15
- 239000010935 stainless steel Substances 0.000 abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 abstract description 5
- 230000008595 infiltration Effects 0.000 abstract 2
- 238000001764 infiltration Methods 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000007847 structural defect Effects 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は金属パイプの製造方法に関し、更に詳しくは、
ロールフォーミング法で形成されその突き合わせ部を溶
接して製造した金属パイプにおいて、その溶接部のピン
ホール欠陥が防止され、水分の侵入や溶接部の腐食等の
発生することがない金属パイプを製造する方法に関する
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing metal pipes, and more specifically,
To manufacture a metal pipe that is formed by a roll forming method and manufactured by welding the abutted parts, in which pinhole defects in the welded parts are prevented and moisture intrusion and corrosion of the welded parts do not occur. Regarding the method.
（従来の技術）
金属パイプの製造に際しては各種の方法が行なわれてい
るが、これら方法のうちにロールフォーミング法がある
。この方法は、所定幅の金属板材を、順次曲率半径が小
さくなるフォーミングダイスが多段に配置されているロ
ールダイス群に送入してパイプ形状に成形したのち、得
られた成形体の長平方向に延びて形成されている突き合
わせ部分を溶接して接合するという方法である。(Prior Art) Various methods are used to manufacture metal pipes, and among these methods there is a roll forming method. In this method, a metal plate material of a predetermined width is fed into a group of roll dies in which forming dies with successively smaller curvature radii are arranged in multiple stages to form it into a pipe shape. This method involves welding and joining the extended butt portions.
この方法は、金属パイプの製造時だけではな（、例えば
、ケーブルコアをステンレス被やアルミ被で被覆して成
る電カケープルの製造時にも適用されている。This method is applied not only to the production of metal pipes (for example, to the production of power cables in which the cable core is coated with stainless steel or aluminum coating).
この場合、突き合わせ部の溶接に際しては、−般に、Ｔ
ｌＣｌ接やＭＩＧ溶接が適用されている。In this case, when welding the butt part, - generally, T
lCl welding and MIG welding are applied.
（発明が解決しようとする課！！！り
ところで、上記した金属パイプや金属被にとって、その
品質管理上置も注意すべきことは、溶接部における組織
欠陥である０例えば、溶接部に欠陥が存在する場合、こ
の欠陥から水分がバイブ内に侵入したり、または水分の
影響により溶接部の電気化学的腐食が進行したりするこ
とがある。このような問題は、例えば海底ケーブルにと
っては致命的な問題となる。(This is a problem that the invention aims to solve!!!) By the way, for the above-mentioned metal pipes and metal coverings, one thing that should be noted in terms of quality control is structural defects in the welded parts. If present, these defects can allow moisture to enter the vibrator or cause electrochemical corrosion of the weld, which can be fatal for submarine cables, for example. This becomes a problem.
そのため、一般に、製造された金属パイプ、とりわけそ
の溶接部にたいしては厳しい品質検査が行なわれている
。その場合、金属パイプが短尺品であれば、溶接部の検
査域も短いため、例えばＸ線を用いた非破壊深傷試験な
どによって作業者が全数をチエツクすることは可能であ
る。Therefore, in general, manufactured metal pipes, especially their welded parts, are subjected to strict quality inspections. In this case, if the metal pipe is a short product, the inspection area of the welded part is also short, so it is possible for the operator to check all the pipes by, for example, a non-destructive deep damage test using X-rays.
しかしながら、長尺品の場合は、それらの突き合わせ部
の溶接は通常自動的にかつ連続的に行なわれるので、製
造された金属パイプの全長に亘って検査を行なうことは
困難である。However, in the case of long products, welding of the butt portions is usually performed automatically and continuously, so it is difficult to inspect the entire length of the manufactured metal pipe.
その場合でも、溶接部の欠陥が目視観察可能な程度に大
きいときは、それを事前に検知することもできるが、し
かし欠陥がピンホールのように極めて小さい場合には、
その発見が掻めて困難であり見落すことがある。Even in that case, if the defect in the weld is large enough to be visually observed, it can be detected in advance, but if the defect is extremely small like a pinhole,
Its discovery is extremely difficult and may be overlooked.
本発明は、前記した溶接部におけるピンホールも含めた
組織欠陥の存在を略完全に解消し、もって上記したよう
な煩雑で困難な品質検査を行なう必要もないほどに溶接
部の特性を向上せしめた金属パイプの製造方法の提供を
目的とする。The present invention substantially completely eliminates the existence of structural defects including pinholes in the welded part, thereby improving the characteristics of the welded part to such an extent that there is no need to perform the above-mentioned complicated and difficult quality inspections. The purpose of this invention is to provide a method for manufacturing metal pipes.
（課題を解決するための手段・作用）
上記した目的を達成するために、本発明においては、金
属板材をロールフォーミング法によってパイプ形状に成
形したのちその突き合わせ部を溶接して溶接部を形成し
、ついで、前記溶接部を低温アーク溶射法により前記金
属板と同質の金属または合金から成る金属溶射層で被覆
することを特徴とする金属パイプの製造方法が提供され
る。(Means and effects for solving the problem) In order to achieve the above-mentioned object, in the present invention, a metal plate is formed into a pipe shape by a roll forming method, and then the abutting portions are welded to form a welded portion. Then, there is provided a method for manufacturing a metal pipe, characterized in that the welded portion is coated with a metal sprayed layer made of the same metal or alloy as the metal plate by a low-temperature arc spraying method.
本発明方法においては、まず、従来から行なわれている
ように、所定材質の金属板材にロールフォーミングを施
してパイプ形状体を成形したのち、その突き合わせ部を
溶接してパイプとする。このときの溶接法は、ＴＩＧ、
ＭＩＧのような従来適用されている方法であればよく何
ら限定されるものではない。In the method of the present invention, first, as conventionally done, a metal plate made of a predetermined material is roll-formed to form a pipe-shaped body, and then the abutted portions are welded to form a pipe. The welding method at this time is TIG,
There is no limitation in any way as long as it is a conventionally applied method such as MIG.
ついで、パイプの長手方向に伸長している溶接部の上に
、後述する低温アーク溶射法により、金属溶射層を形成
する。このとき、金属溶射層は、溶接部の表面全体を被
覆するような広がりをもって形成される。溶接部の表面
全体を被覆しない場合には、金属溶射層に関する後述の
効果が発揮されないからである。Next, a metal sprayed layer is formed on the welded portion extending in the longitudinal direction of the pipe by a low-temperature arc spraying method, which will be described later. At this time, the metal sprayed layer is formed so as to spread to cover the entire surface of the welded part. This is because if the entire surface of the welded part is not covered, the effects described below regarding the metal sprayed layer will not be exhibited.
本発明でいう低温アーク溶射法は、低温で被溶射体に溶
融金属（または合金）の微細粒子を溶射して金属溶射層
を形成する方法であり、例えば、溶射すべき金属または
合金から成る２本の線状電橿間でアーク放電を発生せし
め、このときに生成した溶融金属（または合金）の微細
粒子、蒸気化した金属（または合金）の微細粒子を、そ
れらの外周を高速で流れる空気流によって被溶射体の方
向へ高速で移動せしめ、その過程で急冷した前記微細粒
子を被溶射体に吹きつけてそこに溶着せしめることによ
り、目的とする金属溶射層を形成する方法である。The low-temperature arc spraying method referred to in the present invention is a method of spraying fine particles of molten metal (or alloy) onto an object to be sprayed at a low temperature to form a metal spray layer. An arc discharge is generated between two wire-shaped electric poles, and the fine particles of molten metal (or alloy) and vaporized metal (or alloy) generated at this time are transferred to the air flowing at high speed around the outer circumference of the fine particles of molten metal (or alloy). This is a method of forming the desired metal spray layer by moving the fine particles at high speed in the direction of the object to be thermally sprayed by a flow, and in the process, blowing the fine particles, which are rapidly cooled, onto the object to be thermally sprayed and welding them thereto.
このとき、吹きつけられる微細粒子の大きさ、吹きつけ
流量、形成溶射層の厚み等は、そのときのアーク放電条
件、空気流の温度と圧力と流速、吹きつけ時間、ならび
に溶射口と被溶射体との離隔距離等によって適宜に制御
することができる。At this time, the size of the fine particles sprayed, the spray flow rate, the thickness of the sprayed layer, etc. are determined by the arc discharge conditions at that time, the temperature, pressure and velocity of the air flow, the spray time, the spray opening and the sprayed layer. It can be controlled as appropriate depending on the distance from the body.
このときに形成される金属溶射層は、用いた金属板材と
同質の金属（または合金）で構成されている。仮に異質
の材料であった場合には、パイプとの溶着界面において
電気化学的な腐食現象の起る可能性があり、その結果と
してパイプの腐食が進行するからである。The metal sprayed layer formed at this time is made of the same metal (or alloy) as the metal plate material used. If the material is different, there is a possibility that an electrochemical corrosion phenomenon will occur at the welded interface with the pipe, and as a result, corrosion of the pipe will progress.
この金属溶射層は、前記したように微細粒子の集合膜と
して形成されているため、溶接部にピンホールのような
組織欠陥が存在していても、これらの組織欠陥を微細粒
子が略完全に被覆してしまい、溶接部の組織欠陥を封印
することになる。このような効果を充分に発揮せしめる
ためには、低温アーク溶射時に、溶射金属の粒子径が数
十〜数百μｍとなるように溶射条件を設定することが好
ましい。As mentioned above, this metal spray layer is formed as an aggregated film of fine particles, so even if there are structural defects such as pinholes in the weld, the fine particles can almost completely eliminate these structural defects. This will seal the weld tissue defects. In order to fully exhibit such effects, it is preferable to set thermal spraying conditions during low-temperature arc spraying so that the particle size of the sprayed metal is from several tens to several hundreds of micrometers.
また、金属溶射層の厚みは、格別限定されるものではな
いが、しかし、最小でも溶接部の組織欠陥と外部とを完
全に遮断できる程度の厚みに設定し、上記した作用を発
揮せしめるように設定する。In addition, the thickness of the metal sprayed layer is not particularly limited, but it should be set to a minimum thickness that can completely isolate the structural defects of the welded part from the outside, so that the above-mentioned effect can be exerted. Set.
なお、電カケープルなどにおいては、この低温アーク溶
射の前後で、波付フォーミング加工を施すこともできる
。Note that for electric cables and the like, corrugated forming processing can also be performed before and after this low-temperature arc spraying.
（発明の実施例）
第１図に示したように、幅４９０１、厚み０．８閣のス
テンレス板材ｌを連続的にロールフォーミングして、内
径１５６ａｍのパイプを成形した。(Example of the Invention) As shown in FIG. 1, a stainless steel plate l having a width of 490 mm and a thickness of 0.8 mm was continuously roll-formed to form a pipe with an inner diameter of 156 mm.
ロールダイス群（図示しない）を通過し、パイプ状に成
形されたその突き合わせ部１ａにアーク溶接機２を配置
し、このアーク溶接機２を作動して、幅４〜５ｍ、ｆｆ
み０．８〜１． Ｏｔｍの溶接部３を連続的に形成した
。An arc welding machine 2 is placed at the abutting part 1a formed into a pipe after passing through a group of roll dies (not shown).
Mi 0.8-1. Otm welds 3 were continuously formed.
アーク溶接機２の下流側に、低温アーク溶射機４を配置
し、溶接部３の表面にステンレスを溶射して幅８〜ｌＯ
■、厚み０．３〜０．５Ｍのステンレス溶射１１５を連
続的に形成した。A low-temperature arc spraying machine 4 is placed downstream of the arc welding machine 2, and stainless steel is sprayed onto the surface of the welded part 3 to form a width of 8 to 10 liters.
(2) Stainless steel spray 115 with a thickness of 0.3 to 0.5M was continuously formed.
得られたステンレスパイプの溶射層部分につき、Ｘ線深
傷機で表面に露出するピンホールの有無を調べたところ
検出されたピンホールは皆無であった。When the sprayed layer portion of the obtained stainless steel pipe was examined for the presence or absence of pinholes exposed on the surface using an X-ray deep scratch machine, no pinholes were detected.
比較のために、ステンレス溶射層を形成しなかったパイ
プにつき同様の試験を行なったところ、同じ全長の溶接
部において、１０〜３０μｍのピンホールが２個検出さ
れた。For comparison, a similar test was conducted on a pipe on which no stainless steel sprayed layer was formed, and two pinholes of 10 to 30 μm were detected in the welded part of the same overall length.
（発明の効果）
以上の説明で明らかなうよに、本発明方法は、ロールフ
ォーミング法で成形された金属パイプの溶接部における
ピンホールを略完全に封印することができる。それゆえ
、溶接部からの水分の浸入がなく、また溶接部の腐食も
起こすことのない金属パイプを製造することができ、し
かも品質検査も不要とする確度で上記金属パイプを製造
することができ、その工業的価値は極めて大である。(Effects of the Invention) As is clear from the above description, the method of the present invention can almost completely seal pinholes in the welded portion of a metal pipe formed by roll forming. Therefore, it is possible to manufacture metal pipes that do not allow moisture to enter through the welded parts, nor cause corrosion of the welded parts, and can also be manufactured with such accuracy that quality inspection is not required. , its industrial value is extremely large.
第１図は、本発明方法で金属パイプを製造する場合の概
略図である。
１・・・ステンレス板材（金属板材）、ｌａ・・・突き
合わせ部、２・・・アーク溶接機、３・・・溶接部、４
・・・低温アーク溶射機、５・・・ステンレス溶射Ｉ！
！（金属溶射層）。FIG. 1 is a schematic diagram of manufacturing a metal pipe by the method of the present invention. 1... Stainless steel plate material (metal plate material), la... Butt part, 2... Arc welding machine, 3... Welding part, 4
...Low temperature arc spraying machine, 5...Stainless steel spraying I!
! (Metal sprayed layer).
Claims (1)
成形したのちその突き合わせ部を溶接して溶接部を形成
し、ついで、前記溶接部を低温アーク溶射法により前記
金属板と同質の金属または合金から成る金属溶射層で被
覆することを特徴とする金属パイプの製造方法。A metal plate material is formed into a pipe shape by a roll forming method, and the abutted parts are welded to form a welded part, and then the welded part is sprayed with a metal or an alloy of the same quality as the metal plate by a low-temperature arc spraying method. A method for manufacturing a metal pipe, characterized by coating it with a layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1044195A JPH02225654A (en) | 1989-02-23 | 1989-02-23 | Production of metallic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1044195A JPH02225654A (en) | 1989-02-23 | 1989-02-23 | Production of metallic pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02225654A true JPH02225654A (en) | 1990-09-07 |
Family
ID=12684794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1044195A Pending JPH02225654A (en) | 1989-02-23 | 1989-02-23 | Production of metallic pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02225654A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314108A (en) * | 1991-12-02 | 1994-05-24 | Usui Kokusai Sangyo Kaisha Limited | Method of producing welded tube with excellent corrosion-resistant inner surface |
| JP2008001919A (en) * | 2006-06-20 | 2008-01-10 | Mitsui Eng & Shipbuild Co Ltd | Method and structure for improving strength of welding joint |
| DE102007021736A1 (en) * | 2007-05-09 | 2008-11-13 | Gkss-Forschungszentrum Geesthacht Gmbh | Process for the aftertreatment of welded joints |
-
1989
- 1989-02-23 JP JP1044195A patent/JPH02225654A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314108A (en) * | 1991-12-02 | 1994-05-24 | Usui Kokusai Sangyo Kaisha Limited | Method of producing welded tube with excellent corrosion-resistant inner surface |
| JP2008001919A (en) * | 2006-06-20 | 2008-01-10 | Mitsui Eng & Shipbuild Co Ltd | Method and structure for improving strength of welding joint |
| DE102007021736A1 (en) * | 2007-05-09 | 2008-11-13 | Gkss-Forschungszentrum Geesthacht Gmbh | Process for the aftertreatment of welded joints |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2322312B1 (en) | Method for manufacturing laser-welded steel pipe | |
| Krivtsun et al. | Model of the processes of heat, mass and charge transfer in the anode region and column of the welding arc with refractory cathode | |
| JP5489382B2 (en) | Pipe manufacturing method | |
| JPH02225654A (en) | Production of metallic pipe | |
| JP2006175514A (en) | Electric resistance welded tube having reduced defect in weld zone and its production method | |
| US3496326A (en) | Method of welding coated steel | |
| JPH0961313A (en) | Standard specimen for nondestructive inspection and its manufacture | |
| Kumar et al. | A Critical Review on Fume Extraction System for Pipe and Plate Welding | |
| Willgoss et al. | Laser welding of steels for power plant | |
| JPH08127855A (en) | Method for touching-up surface of plated steel and device therefor | |
| JPH0976062A (en) | First layer welding method | |
| JPS61270339A (en) | Manufacture of weld tube superior in groove corrosion resistance | |
| JPS5823591A (en) | Production for small diameter metallic tube involving plastic coated filament material | |
| JPH0571353B2 (en) | ||
| RU1541902C (en) | Method for welding fibrous composite materials | |
| Grünenwald et al. | Nd: YAG laser welding of 5083 aluminium alloy using filler wire | |
| Miyamoto et al. | Production of thin wall welded titanium tubes by high frequency pulsed arc welding | |
| JPH0976094A (en) | Gas shield method for weld zone in tube welding | |
| JPH04305379A (en) | Method for preventing weld defect of electro-resistance-welded tube | |
| Coste et al. | Optimizing the quality of TA6V and Inconel laser welding on airplane part manufacturing | |
| Kazasidis et al. | Parametric analysis of the stringer bead reinforcement area and prediction of the number of beads in a single-V butt joint, using the robotic Flux-cored arc welding technique | |
| JPH03227218A (en) | Production of composite pipe | |
| JPH0857667A (en) | Seam profiling control method for beam welded pipe and seam profiling controller | |
| CN114769925A (en) | Double-layer coiled pipe process optimization method | |
| WO2020206194A1 (en) | Shielding and cooling a continuous weld between steel sheets/plates using a non-oxidizing atmosphere to reduce the formation of oxide on a surface of the continuous weld |