JPH0675788B2 - Welding method for pipe materials - Google Patents
Welding method for pipe materialsInfo
- Publication number
- JPH0675788B2 JPH0675788B2 JP11514786A JP11514786A JPH0675788B2 JP H0675788 B2 JPH0675788 B2 JP H0675788B2 JP 11514786 A JP11514786 A JP 11514786A JP 11514786 A JP11514786 A JP 11514786A JP H0675788 B2 JPH0675788 B2 JP H0675788B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- pipe
- water
- foam
- pipe materials
- 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
- 238000003466 welding Methods 0.000 title claims description 31
- 239000000463 material Substances 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 11
- 239000006260 foam Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- -1 amine salt Chemical class 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000021314 Palmitic acid Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical class OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000006297 carbonyl amino group Chemical group [H]N([*:2])C([*:1])=O 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 229940070765 laurate Drugs 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 235000017709 saponins Nutrition 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 鋼，合金鋼，ステンレス，アルミニウム管など溶接時の
アルゴン，ヘリウムガス等の流出防止と同ガス雰囲気保
持方法の改善に関する。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to prevention of outflow of argon, helium gas, etc. during welding of steel, alloy steel, stainless steel, aluminum pipe, etc., and improvement of the method for maintaining the same gas atmosphere.
従来の各種管材の突合せ溶接方法では，例えばステンレ
ス鋼管の溶接はアルゴン又はヘリウムガスなど不活性ガ
ス等の雰囲気中でアーク溶接を行い，クロム酸化物の生
成を防止していた。この際，管内に吹込むガスは際限な
く流出して不経済，かつ溶接部の空気の置換性及び不活
性ガス雰囲気の保持性も悪かった。したがって，溶接部
両側管の内部に詰物をして管を閉塞して溶接を行ってい
た。In the conventional butt welding method for various pipe materials, for example, welding of a stainless steel pipe is carried out by arc welding in an atmosphere of an inert gas such as argon or helium gas to prevent generation of chromium oxide. At this time, the gas blown into the pipe was infinitely outflowing, which was uneconomical, and the replacement of air in the weld and retention of the inert gas atmosphere were poor. Therefore, welding was performed by filling the inside of the pipes on both sides of the welded part and closing the pipes.
従来の管を閉塞する詰物として，ポリビニルアルコール
を主成分とした水溶性シートを一定寸法に切り，これを
丸めて使用して溶接を行っていた。この状況を図によっ
て説明する。第１図において，ステンレス鋼管１の溶接
部２を溶接する作業において，充填材（水溶性ポリビニ
ルアルコールシート）３を溶接部２から150mm以上離し
て詰込んでいた。それは溶接部２の熱影響で充填材（水
溶性ポリビニルシート）３が不溶性になる等を避けるた
めである。このようにして溶接部２の隙間から第２図の
ように例えばアルゴンガスがスプレイ缶４によって管内
部へ吹込み，内部の空気を置換してアルゴンガス雰囲気
に保持し，ディグトーチ5,溶加棒６によって溶接が開始
する。溶接が終了すれば充填材（水溶性ポリビニルシー
ト）３は管内に取り残されるが，水圧試験水が管内に満
たされた時この水に溶解していた。Conventionally, a water-soluble sheet containing polyvinyl alcohol as a main component was cut into a certain size as a filling material for closing a pipe, and this was rolled and used for welding. This situation will be described with reference to the drawings. In FIG. 1, in the work of welding the welded portion 2 of the stainless steel pipe 1, the filler (water-soluble polyvinyl alcohol sheet) 3 was packed 150 mm or more away from the welded portion 2. This is to prevent the filler (water-soluble polyvinyl sheet) 3 from becoming insoluble due to the heat effect of the welded portion 2. Thus, as shown in FIG. 2, for example, argon gas is blown into the inside of the pipe by the spray can 4 from the gap of the welded portion 2 to replace the air inside and maintain the atmosphere in the argon gas. Welding starts with 6. When the welding was completed, the filler (water-soluble polyvinyl sheet) 3 was left in the pipe, but was dissolved in this water when the hydraulic test water was filled in the pipe.
水溶性ポリビニルアルコールシートを管内に充填するこ
とは，水溶性ポリビニルアルコールシートを丸めて管内
に充填された状態で水に浸漬されると，溶解性が極端に
悪くなり，長時間マスコ状又は湖の固まり状となる。従
って管内の排出が困難となる。特に発電ボイラの水，蒸
気系では固形分及び有機物が残存すると管の腐食，スケ
ール障害などを生じる危険性がある。When the water-soluble polyvinyl alcohol sheet is filled in the tube, the solubility becomes extremely poor when the water-soluble polyvinyl alcohol sheet is rolled and immersed in water while it is filled in the tube. It becomes a lump. Therefore, it becomes difficult to discharge the inside of the pipe. Especially in water and steam systems of power generation boilers, if solids and organic substances remain, there is a risk of corrosion of pipes and scale failure.
このため発電ボイラの場合はこれの排出に長時間の洗浄
作業と大量の純水を要していた。For this reason, in the case of a power generation boiler, a long cleaning work and a large amount of pure water were required to discharge it.
本発明は上記問題点を解決するために，突合せ溶接され
る管材内部に，シールドガス雰囲気を保持できる発泡性
で，かつ水溶性の泡沫を充填してから管材の突合せ溶接
を行う方法である。すなわち，シールドガスを供給し，
その雰囲気中で各種管材の突合せ溶接を行う管材におい
て，溶接部の両側管材内部に前記シールドガスの雰囲気
保持と同ガスの流出を防止する水溶性の泡沫を満たして
突合せ溶接することを特徴とする管材の溶接方法を提供
するものである。In order to solve the above problems, the present invention is a method of butt-welding pipe materials after filling the inside of the pipe materials to be butt-welded with a foamable and water-soluble foam capable of holding a shielding gas atmosphere. That is, supply the shielding gas,
In a pipe material for butt welding of various pipe materials in the atmosphere, the butt welding is performed by filling the inside of the pipe materials on both sides of the welded portion with a water-soluble foam that maintains the atmosphere of the shield gas and prevents the gas from flowing out. A method for welding a pipe material is provided.
本発明は上記のような管材の溶接方法となるので，溶接
部の両側管材内部に水溶性で，かつ発泡性の泡沫を一定
距離に保ちつつ所要長さに充填して，前記管材内部をシ
ールドガス雰囲気に保持してから管材の突合せ溶接を行
い，溶接終了後に管材内部を水洗浄して前記泡沫を除去
することで管材内部の清浄度を高めることが可能となる
溶接方法である。INDUSTRIAL APPLICABILITY Since the present invention is a method of welding a pipe as described above, water-soluble and foaming foam is filled into the inside of both-side pipes of a welded portion at a required length while keeping a certain distance to shield the inside of the pipe. This is a welding method in which the cleanliness of the inside of the pipe material can be enhanced by carrying out butt welding of the pipe material after maintaining the gas atmosphere, and washing the inside of the pipe material with water after the welding is completed to remove the bubbles.
以下，本発明を図面に示す実施例に基づいて具体的に説
明する。第１図は本発明の一実施例に係る管材の溶接方
法でステンレス鋼管を突合せ溶接する場合の断面図，第
２図は実施例に係る第１図のII−II矢視側面の断面図を
示す。以下にその説明をする。Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of butt-welding a stainless steel pipe by a welding method of a pipe material according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 according to the embodiment. Show. The explanation will be given below.
一般に有機物質の方が無機物質よりその水溶液の発泡
性，安定性とも大きい。アルコール類，脂肪酸類，石
鹸，合成界面活性剤，色素等の低分子物質，蛋白質，サ
ポニン，でん粉，ゴム等の天然合成高分子物質など水溶
液で発泡する物質は極めて多数あるが，一般的には泡沫
生成物質としてOH・CO・SOOH・COO-，CONH2,COC,NH2，O
SO3 -，SO-などの親水基とアルキル基，アリル基，アル
キルアリル基等の疏水基を同時に分子内に有するものを
単独又は二重以上の混合で得ることができる。しかし，
これらは濃度と発泡方法によって泡沫の状態は実に多様
である。In general, organic substances have greater foamability and stability in aqueous solutions than inorganic substances. Alcohols, fatty acids, soaps, synthetic surfactants, low molecular weight substances such as pigments, proteins, saponins, starches, natural synthetic high molecular substances such as rubber, etc. foam generating material as OH · CO · SOOH · COO - , CONH 2, COC, NH 2, O
Those having a hydrophilic group such as SO 3 − and SO − and a hydrophobic group such as an alkyl group, an allyl group and an alkylallyl group in the molecule at the same time can be obtained alone or in a mixture of two or more. However,
The foam state of these is quite different depending on the concentration and foaming method.
本発明で使用する泡沫は，液の流下がないこと，長時間
安定であること，弾性と強度を有すること等の性質が優
れることが要求される。又，作業性の上から，発泡装置
が軽便でワンタッチで一定量の泡沫が得られなければな
らない。種々行った実験の結果では，この目的に合致す
る組成物として，C12〜C18の高級脂肪酸のアルカリ塩が
適当であった。すなわち，ラウリン酸，ミリスチン酸，
パルミチン酸，ステアリン酸，オレイン酸等の単独又は
混合物をナトリウム，カリウム，アンモニウムのほか，
アミン塩として使用するが，系内に溶解固形分を残さな
いものとしてトリエタノールアミン塩を採択した。The foam used in the present invention is required to have excellent properties such as no liquid flowing down, stability for a long time, elasticity and strength. Also, from the standpoint of workability, the foaming device must be convenient and a certain amount of foam can be obtained with a single touch. According to the results of various experiments, an alkali salt of a C 12 to C 18 higher fatty acid was suitable as a composition that met this purpose. Lauric acid, myristic acid,
Palmitic acid, stearic acid, oleic acid, etc., alone or in combination, in addition to sodium, potassium, ammonium,
A triethanolamine salt was adopted because it is used as an amine salt but does not leave dissolved solids in the system.
上記脂肪酸の単独もしくは二種以上の混合物の濃度20〜
40重量パーセントの水溶液にLPG5〜15重量パーセント
を，噴射ノズルをもつ缶いわゆるスプレイ缶として製作
すればよい。Concentration of the above fatty acids singly or in a mixture of two or more 20 to
It is sufficient to manufacture 5 to 15 weight percent LPG in a 40 weight percent aqueous solution as a so-called spray can having a jet nozzle.
以上の見地からステアリン酸アミン30％水溶液300mlと
ラウリン酸アミン20％水溶液30mlを混合し,30mlのLPGを
封入してスプレイ缶とする。これをよく振とうして噴射
すれば，直ちに水気のない硬質，弾性のある泡沫が形成
する。例えば内径43mmのステンレス鋼管の溶接作業にこ
れを使用したが，泡沫を溶接部から200mm隔て約150mmの
長さに充填して１時間後アルゴンガスを2l/min流して溶
接を行った。第１層の溶接は数分で終了するので管内へ
のアルゴンガス注入も終了する。全溶接終了後管内に純
水を満たし，暫時放置して排出したが，充填した泡沫は
完全に溶解排出され残留物を認められなかった。また，
溶接部の放射線による検査で欠陥はなく，割管して溶接
部裏面の点検においてもクロム酸化物の生成は認めなか
った。このように発電プラント，化学プラントにあって
は，溶接作業後に管内，系内に残留物があることを忌避
するので，材料に対する腐食をはじめ系統に悪影響を与
える組成物であってはならず，又，可能なかぎりその量
も少量であることが望まれる。本発明に適用した泡沫は
従来のポリビニルアルコール製シートの使用量の数十分
の１〜百数十分の１に過ぎず，しかも溶解性が極端に優
れるものである。From the above viewpoint, 300 ml of a 30% aqueous solution of amine stearate and 30 ml of a 20% aqueous solution of amine laurate are mixed, and 30 ml of LPG is enclosed to form a spray can. If this is shaken well and sprayed, immediately a hard, elastic foam is formed without water. For example, this was used for welding a stainless steel pipe with an inner diameter of 43 mm, and the foam was filled to a length of about 150 mm at a distance of 200 mm from the welded part, and after 1 hour, welding was performed by flowing 2 l / min of argon gas. Since the welding of the first layer is completed in a few minutes, the injection of argon gas into the pipe is also completed. After the completion of all welding, the pipe was filled with pure water and left for a while to be discharged, but the filled foam was completely dissolved and discharged, and no residue was observed. Also,
The inspection of the weld by radiation showed no defects, and the formation of chromium oxide was not observed in the inspection of the back of the weld after splitting the pipe. As described above, in a power plant or a chemical plant, since the residue in the pipe and the system is avoided after the welding work, the composition should not adversely affect the system including corrosion of materials, It is also desirable that the amount be as small as possible. The foam applied to the present invention is only several tenths to one hundredths and tenths of the amount of the conventional polyvinyl alcohol sheet used, and has extremely excellent solubility.
以上，具体的に説明したように本発明においては管材内
部のガスシールド雰囲気が保持されて溶接品質は向上す
ることと，充填される泡沫が水溶性に優れることから残
留異物は排出されやすくなり，充填材料の節減が図れる
とともに洗浄に要する各種の無駄が省かれる。As described above in detail, in the present invention, the gas shield atmosphere inside the pipe material is maintained to improve the welding quality, and the filled foam is excellent in water solubility, so that the residual foreign matter is easily discharged, The filling material can be saved and various kinds of waste required for cleaning can be omitted.
第１図は本発明の一実施例に係るステンレス鋼管の突合
せ溶接断面図，第２図は本実施例に係る第１図のII−II
矢視側面の断面図である。又，上記各図は従来の溶接方
法において，充填材３が本発明で泡沫に，従来はポリビ
ニルアルコールシートのみ相違することで，他の構成は
同一条件である。 １……管材,2……突合せ溶接部,3……充填材（本発明で
は泡沫，従来はポリビニルアルコールシート）,4……ス
プレイ缶,5……ティグトーチ,6……溶加棒。FIG. 1 is a butt welding sectional view of a stainless steel pipe according to an embodiment of the present invention, and FIG. 2 is a II-II of FIG. 1 according to the present embodiment.
It is sectional drawing of the arrow view side. Further, in each of the above drawings, in the conventional welding method, the filler 3 is a foam in the present invention, and only the polyvinyl alcohol sheet is different in the conventional case, and other configurations are the same condition. 1 ... Pipe material, 2 ... Butt welded portion, 3 ... Filler (foam in the present invention, polyvinyl alcohol sheet in the past), 4 ... Spray can, 5 ... Tig torch, 6 ... Filler rod.
Claims (1)
種管材の突合せ溶接を行う管材において，溶接部の両側
管材内部に前記シールドガスの雰囲気保持と同ガスの流
出を防止する水溶性の泡沫を満たして突合せ溶接するこ
とを特徴とする管材の溶接方法。1. A pipe material in which a shield gas is supplied and butt-welding of various pipe materials is carried out in the atmosphere thereof. A water-soluble foam which maintains the atmosphere of the shield gas inside the pipe materials on both sides of the welded portion and prevents the gas from flowing out. A method for welding pipe materials, characterized in that butt welding is performed by satisfying the conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11514786A JPH0675788B2 (en) | 1986-05-20 | 1986-05-20 | Welding method for pipe materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11514786A JPH0675788B2 (en) | 1986-05-20 | 1986-05-20 | Welding method for pipe materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62270281A JPS62270281A (en) | 1987-11-24 |
| JPH0675788B2 true JPH0675788B2 (en) | 1994-09-28 |
Family
ID=14655471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11514786A Expired - Lifetime JPH0675788B2 (en) | 1986-05-20 | 1986-05-20 | Welding method for pipe materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0675788B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0734998B2 (en) * | 1990-08-18 | 1995-04-19 | 動力炉・核燃料開発事業団 | Back sealing method for pipe welding |
| JP4786378B2 (en) | 2006-03-14 | 2011-10-05 | 三菱重工業株式会社 | Piping joint structure |
| DE102011053171A1 (en) * | 2011-08-31 | 2013-02-28 | Hitachi Power Europe Gmbh | Forming body for sealing an object to be welded, in particular a pipe |
| CN102601499A (en) * | 2012-03-22 | 2012-07-25 | 中国石油天然气第六建设公司 | Method for protecting welding of petrochemical stainless steel pipeline by local argon filling |
| CN103862197A (en) * | 2012-12-13 | 2014-06-18 | 中国核动力研究设计院 | Welding materials and welding method for main pipe narrow gap automatic welding |
| JP6386127B1 (en) * | 2017-04-10 | 2018-09-05 | 株式会社東芝 | Welding method and back shield device |
-
1986
- 1986-05-20 JP JP11514786A patent/JPH0675788B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62270281A (en) | 1987-11-24 |
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| EXPY | Cancellation because of completion of term |