JP3117778B2 - Pipe sealing welding method and apparatus - Google Patents
Pipe sealing welding method and apparatusInfo
- Publication number
- JP3117778B2 JP3117778B2 JP04055388A JP5538892A JP3117778B2 JP 3117778 B2 JP3117778 B2 JP 3117778B2 JP 04055388 A JP04055388 A JP 04055388A JP 5538892 A JP5538892 A JP 5538892A JP 3117778 B2 JP3117778 B2 JP 3117778B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- welding
- pipe
- sealing
- gas
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば核燃料棒のよう
に、一端が封じられた管内に固体物質と気体又は気体の
みを充填し、その後上記管の開口端に端栓を取付け、そ
の端栓と管とを密封溶接するようにした管の封緘溶接方
法及びその装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a method of filling a tube, one end of which is sealed, with a solid substance and gas or gas only, such as a nuclear fuel rod, and then attaching an end plug to the open end of the tube. The present invention relates to a method and apparatus for sealing and welding a pipe in which a stopper and a pipe are hermetically welded.
【０００２】[0002]
【従来の技術】一般に、原子炉用の核燃料棒は、図５に
示すように、被覆管１内に燃料ペレット２及びコイルス
プリング３を充填するとともに、空間４に不活性ガスを
封入し、両端に端栓５，６を溶接密封した構成となって
いる。2. Description of the Related Art In general, a nuclear fuel rod for a nuclear reactor has a cladding tube 1 filled with fuel pellets 2 and a coil spring 3 as shown in FIG. The end plugs 5 and 6 are welded and sealed.
【０００３】ところで、上述の如き核燃料棒を製造する
場合には、被覆管１の一端に予め端栓５を溶接してお
き、他方の開口端から核燃料ペレット２及びコイルスプ
リング３を装填し、図６に示すような溶接装置の溶接チ
ャンバー１０内に、上記被覆管１の開口端部を挿入し、
溶接チャンバー１０内を気密状態にする。その後、真空
排気装置１１によって溶接チャンバー１０内及び被覆管
１内を排気する。このようにして溶接チャンバー１０内
が排気真空になったら、真空排気装置１１の弁を閉じ、
溶接トーチ１２のガス導入管よりヘリウムガス又は他の
ガス（以下充填ガスという）を流し込み、チャンバー内
及び被覆管内空隙を上記充填ガスで充満し、その後端栓
圧入装置１３によって端栓６を被覆管１の開口端に圧入
し、被覆管を気密状態にする。しかる後上記被覆管１を
回転機構１４によって回転しながら、溶接トーチ１２の
先端に取付けられた電極１５によって上記被覆管１と端
栓６との溶接を行ない、被覆管１の密閉を行う。When manufacturing a nuclear fuel rod as described above, an end plug 5 is welded to one end of a cladding tube 1 in advance, and a nuclear fuel pellet 2 and a coil spring 3 are loaded from the other open end. 6, the opening end of the cladding tube 1 is inserted into a welding chamber 10 of a welding device as shown in FIG.
The inside of the welding chamber 10 is made airtight. Thereafter, the inside of the welding chamber 10 and the inside of the cladding tube 1 are evacuated by the vacuum evacuation device 11. When the interior of the welding chamber 10 is evacuated to vacuum, the valve of the evacuator 11 is closed,
Helium gas or another gas (hereinafter referred to as a filling gas) is supplied from a gas introduction tube of the welding torch 12, and the inside of the chamber and the inside of the cladding tube are filled with the filling gas. 1 to make the cladding tube airtight. Thereafter, while the cladding tube 1 is rotated by the rotating mechanism 14, the cladding tube 1 and the end plug 6 are welded by the electrode 15 attached to the tip of the welding torch 12, and the cladding tube 1 is sealed.
【０００４】ところが、このような方法によって被覆管
の封緘を行なう場合には、管内の充填ガスが溶接熱を受
けて圧力を上昇し、この圧力増加によって図７に示すよ
うに溶融金属１６が内部から押し出され、膨れ欠陥１７
が生じたり、場合によっては管内の充填ガスが溶融金属
を破って管外に放出され、密閉不能となることがある。However, when the cladding tube is sealed by such a method, the filling gas in the tube receives welding heat to increase the pressure, and as a result of this increase in pressure, the molten metal 16 becomes internal as shown in FIG. Swelling defect 17
May occur, or in some cases, the filling gas in the pipe may break the molten metal and be released outside the pipe, making it impossible to seal.
【０００５】そこで、上記膨れ欠陥１７や密閉不能を防
止するため、端栓圧入後、溶接チャンバー１０内の圧力
を被覆管１の管内圧力の最大値又はそれ以上の圧力にし
た状態で溶接する手段が提案されている（特公昭５２−
２５５１９号公報、実公昭５５−５２４００号公報、特
開昭６０−１１３１９６号公報参照）。Therefore, in order to prevent the swelling defect 17 and the inability to seal, means for welding with the pressure in the welding chamber 10 set to the maximum value of the pressure in the cladding tube 1 or more after the end plug is press-fitted. Has been proposed.
25519, JP-B-55-52400, and JP-A-60-113196.
【０００６】すなわち、図８に示すように、溶接チャン
バー１０には充填ガス圧力制御装置２０及び溶接チャン
バー内圧制御装置２１を有する導管２２が接続してあ
る。上記シールドガス圧力制御装置２０及び溶接チャン
バー内圧制御装置２１は、それぞれ電磁開閉弁２０ａ，
２１ａ及びリリーフ弁２０ｂ，２１ｂを有しており、リ
リーフ弁２０ｂは溶接チャンバー内の圧力を充填ガス圧
Ｐ1 に保持するように設定され、他のリリーフ弁２１ｂ
は上記充填ガス圧Ｐ1 より△Ｐ0 だけ高い圧力Ｐ2 に溶
接チャンバー内の圧力を保持するように設定されてい
る。That is, as shown in FIG. 8, a conduit 22 having a filling gas pressure control device 20 and a welding chamber internal pressure control device 21 is connected to the welding chamber 10. The shield gas pressure control device 20 and the welding chamber internal pressure control device 21 include an electromagnetic on-off valve 20a,
21a and a relief valve 20b, have 21b, relief valve 20b is set so as to maintain the pressure in the welding chamber to the filling gas pressure P 1, the other relief valve 21b
Is set to maintain the pressure in the welding chamber at as high a pressure P 2 △ P 0 from the filling gas pressure P 1.
【０００７】しかして、被覆管１の端栓６の溶接に際し
ては、溶接チャンバー１０及び被覆管１の内部を真空排
気した後、溶接トーチ１２から充填ガスを溶接チャンバ
ー１０内に導入して充満させる。このとき、電磁開閉弁
２０ａが開かれ電磁開閉弁２１ａは閉じられている。し
たがって、溶接チャンバー１０内はリリーフ弁２０ｂに
よって前記充填ガス圧Ｐ1 に保たれる。When the end plug 6 of the cladding tube 1 is welded, the interior of the welding chamber 10 and the cladding tube 1 are evacuated, and then a filling gas is introduced from the welding torch 12 into the welding chamber 10 to fill it. . At this time, the electromagnetic on-off valve 20a is opened and the electromagnetic on-off valve 21a is closed. Accordingly, the welding chamber 10 is kept at the filling gas pressure P 1 by the relief valve 20b.
【０００８】そこで、被覆管１の端部に端栓６を圧入
し、その後電磁開閉弁２０ａを閉じリリーフ弁２０ｂを
非作動状態とするとともに、電磁開閉弁２１ａを開き、
リリーフ弁２１ｂを作動状態とする。したがって、溶接
チャンバー１０内の圧力は被覆管１の内圧Ｐ1 よりも△
Ｐ0 だけ高い圧力Ｐ2 に保たれ、この状態で上記端栓６
の溶接を行なう。Therefore, the end plug 6 is press-fitted into the end of the cladding tube 1, then the electromagnetic on / off valve 20a is closed, the relief valve 20b is deactivated, and the electromagnetic on / off valve 21a is opened.
The relief valve 21b is set to the operating state. Therefore, the pressure in the welding chamber 10 is more than the internal pressure P 1 of the cladding tube 1.
Only P 0 is maintained at a higher pressure P 2, the end plug in this condition 6
Welding.
【０００９】[0009]
【発明が解決しようとする課題】ところが、図５に示し
たような構造で管内部に充填ガスを充満させて端栓を機
械的に嵌合して溶接すると、管内のガス圧力は、図９の
曲線ａに示すようにその溶接熱によって溶接時間ととも
に増加する。However, when the inside of the pipe is filled with a filling gas and the end plug is mechanically fitted and welded in the structure as shown in FIG. 5, the gas pressure in the pipe becomes as shown in FIG. As shown by curve a, the welding heat increases with the welding time.
【００１０】これに対し、上記溶接期間中溶接チャンバ
ー内を所定圧に保持させるものにおいては、溶接チャン
バー１０内の圧力すなわち管の外圧が、図９のb線で示
すように一定であるため、被覆管１の内外の圧力差ΔP
が、内圧上昇の無い溶接初期の圧力差ΔP0から溶接によ
る内圧上昇とともに徐々に減少し、全周に亘る溶接が常
に同一の条件では行われないという問題がある。On the other hand, in the case where the inside of the welding chamber is maintained at a predetermined pressure during the welding period , the pressure in the welding chamber 10, that is, the external pressure of the pipe is constant as shown by the line b in FIG. Pressure difference ΔP between inside and outside of cladding tube 1
However, there is a problem in that the pressure difference ΔP0 in the initial stage of welding without an internal pressure rise gradually decreases with an increase in internal pressure due to welding, and welding over the entire circumference is not always performed under the same conditions.
【００１１】すなわち、溶接による管内圧力の上昇を予
め測定しておき、その最大圧力上昇ΔＰmax を求め、Δ
Ｐ≧ΔＰmax を溶接中に加えると、確かに膨れ欠陥の防
止はできるが、内圧上昇の少ない溶接初期においては圧
力差が大きすぎて、図１０に示すように溶融金属１６を
管内に押し込んでしまうことがある等の問題がある。That is, a rise in pipe pressure due to welding is measured in advance, and the maximum pressure rise ΔP max is obtained.
If P ≧ ΔP max is added during welding, the blistering defect can be certainly prevented, but the pressure difference is too large in the early stage of welding where the internal pressure rise is small, and the molten metal 16 is pushed into the pipe as shown in FIG. There is a problem that it may happen.
【００１２】また、このような方法においては、溶接姿
勢によっては加圧下のため、図１０に示すような溶融形
態を示す他、図１１に示すように、溶融金属１６がボイ
ド２２を捕獲し、気孔２３等の溶接欠陥を発生させ、溶
接健全性に係る品質上の問題及び収率の低下等のコスト
上の問題が生じることがある。Further, in such a method, the molten metal 16 captures the voids 22 as shown in FIG. 11 in addition to the molten form shown in FIG. A weld defect such as the pores 23 may be generated, and a quality problem related to welding integrity and a cost problem such as a decrease in yield may occur.
【００１３】本発明は、このような点に鑑み、溶接時に
おける膨れ欠陥や押し込み欠陥、又はボイドや気孔のな
い健全な溶接部を得ることができる管の封緘溶接方法及
び溶接装置を得ることを目的とする。The present invention has been made in view of the above circumstances, and has as its object to provide a pipe sealing welding method and a welding apparatus capable of obtaining a sound weld without swelling defects or indentation defects at the time of welding, or voids or pores. Aim.
【００１４】[0014]
【課題を解決するための手段】第１の発明は、一端が封
じられた管内に固体物質と気体又は気体のみを充填し、
その後上記管の開口端に端栓を取付け、その端栓と管と
を密封溶接するようにした管の封緘溶接方法において、
溶接熱による管内圧力の上昇に対応して、溶接時間の経
過とともに上記管に加えられる外圧を管内と前記外圧と
の差圧が、溶融金属に膨れ欠陥を生じさせる圧力以下の
所定圧力になるように段階的に増圧することを特徴とす
る。According to a first aspect of the present invention, a tube having one end sealed is filled with a solid substance and a gas or only a gas,
Thereafter, an end plug is attached to the open end of the tube, and in the tube sealing welding method in which the end plug and the tube are hermetically welded,
In response to the increase in the pressure in the pipe due to the welding heat, the external pressure applied to the pipe with the elapse of welding time is adjusted so that the differential pressure between the pipe and the external pressure becomes a predetermined pressure equal to or less than the pressure that causes swelling defects in the molten metal. The pressure is gradually increased.
【００１５】また、第２の発明は、少なくとも上記管の
開口端部を挿入装着する溶接チャンバーに、上記溶接チ
ャンバー内の圧力を溶接熱による管内圧力の上昇に対応
して上記管内圧力との差が一定値以内になるように順次
増圧する圧力制御装置を接続したことを特徴とする。According to a second aspect of the present invention, the pressure in the welding chamber is set at least in the welding chamber in which the open end of the pipe is inserted and mounted, in correspondence with an increase in the pipe pressure due to welding heat. Is connected to a pressure control device for sequentially increasing the pressure so as to fall within a predetermined value.
【００１６】[0016]
【作用】溶接チャンバー内における溶接開始時には、そ
のチャンバー内の圧力すなわち管の外部に加わる加圧力
を小さくしておき、溶接の進行と共に段階的に又は連続
的に増圧するので、溶接による管内圧の上昇に対して管
外圧が適切な圧力差になるように保持され、溶接部にお
ける膨れ欠陥や押し込み欠陥が防止され溶融金属による
ボイドの捕獲等も防止され、気孔等の溶接欠陥の発生が
防止される。At the start of welding in the welding chamber, the pressure in the chamber, that is, the pressure applied to the outside of the pipe is reduced, and the pressure is increased stepwise or continuously with the progress of welding. The external pressure of the pipe is maintained so as to have an appropriate pressure difference against the rise, swelling defects and indentation defects in the welded portion are prevented, voids are not trapped by molten metal, and welding defects such as pores are prevented from occurring. You.
【００１７】[0017]
【実施例】以下、図１乃至図４を参照して本発明の実施
例について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
【００１８】図１は本発明を実施するのに適した管の封
緘溶接装置の概略構成を示す図であり、溶接チャンバ１
０の一側壁部には、ウラン酸化物又はプルトニウム酸化
物の焼結体からなる核燃料ペレットを装填した被覆管１
の開口端部をその溶接チャンバー１０内に挿入保持する
開口部が形成されており、上記被覆管１の開口端と対向
する位置には端栓圧入装置１３が設けられている。ま
た、上記溶接チャンバー１０の上壁部には、下端に電極
１５が装着された溶接トーチ１２が装着され、さらに溶
接チャンバー１０の下部には真空排気装置（図示せず）
が接続されている。FIG. 1 is a view showing a schematic configuration of a pipe sealing and welding apparatus suitable for carrying out the present invention, and shows a welding chamber 1.
0, a cladding tube 1 loaded with nuclear fuel pellets made of a sintered body of uranium oxide or plutonium oxide.
An opening for inserting and holding the open end of the cladding tube 10 in the welding chamber 10 is formed, and an end plug press-fitting device 13 is provided at a position facing the open end of the cladding tube 1. In addition, a welding torch 12 having an electrode 15 mounted on a lower end is mounted on an upper wall portion of the welding chamber 10, and a vacuum exhaust device (not shown) is further mounted on a lower portion of the welding chamber 10.
Is connected.
【００１９】また、溶接チャンバー１０にはシールドガ
ス圧力制御装置２０、溶接チャンバー内圧制御装置２
３、２４が導管２２を介して接続してある。この溶接チ
ャンバー内圧制御装置２３、２４もそれぞれ電磁開閉弁
２３ａ、２４ａ及びリリーフ弁２３ｂ、２４ｂを有して
おり、リリーフ弁２３ｂ、２４ｂは、それぞれ被覆管１
内の圧力上昇に対応して溶接チャンバー１０内の圧力と
の差圧が一定範囲になるように溶接チャンバー１０内の
圧力を保持するように設定してある。さらに電磁開閉弁
２３ａ、２４ａにはそれぞれタイマー２５、２６が接続
され、溶接開始後の時間ｔ1 後にタイマー２５によって
電磁開閉弁２０ａが閉じるとともに電磁開閉弁２３ａが
開らき、また時間ｔ2 後にタイマー２６によって電磁開
閉弁２３ａが閉じるととともに電磁開閉弁２４ａが開く
ようにしてある。The welding chamber 10 has a shield gas pressure controller 20 and a welding chamber internal pressure controller 2.
3, 24 are connected via a conduit 22. The welding chamber internal pressure controllers 23 and 24 also have electromagnetic on-off valves 23a and 24a and relief valves 23b and 24b, respectively, and the relief valves 23b and 24b
The pressure in the welding chamber 10 is set to be maintained such that the pressure difference between the pressure in the welding chamber 10 and the pressure in the welding chamber 10 is within a certain range in response to the pressure increase in the inside. Further solenoid valves 23a, 24a timer 25 and 26 is connected to the electromagnetic switching valve 23a is opened closes the electromagnetic on-off valve 20a by the timer 25 after a time t 1 after the start of welding Rhaki, also the timer after a time t 2 26 closes the electromagnetic on-off valve 23a and opens the electromagnetic on-off valve 24a.
【００２０】しかして、端栓６の溶接に際しては、従来
と同様に溶接チャンバー１０内に充填ガスを充填し、溶
接チャンバー１０及び被覆管１内の圧力を充填ガス圧Ｐ
1 に保持し、端栓６を上記被覆管１の開口端部に圧入し
た後、溶接トーチ１２によりその端栓６の溶接を開始す
る。このようにして溶接開始後、時間ｔ1 経過すると、
タイマー２５が作動し、電磁開閉弁２０ａが閉じ電磁開
閉弁２３ａが開らき、リリーフ弁２３ｂによって、図２
に示すように溶接チャンバー１０内の圧力が、被覆管１
内の圧力上昇曲線ＰR により近い圧力Ｐ3 にまで上昇さ
れ、その圧力Ｐa が保持される。ところで、上記時間ｔ
1 は、溶接による被覆管内圧の上昇に伴ない、被覆管内
圧と溶接チャンバー１０内の圧力との最大差圧が溶融金
属に膨れ欠陥を生じさせる圧力以下の所定圧力になる時
点が選ばれている。When the end plug 6 is welded, the filling gas is filled in the welding chamber 10 and the pressure in the welding chamber 10 and the cladding tube 1 is increased by the filling gas pressure P as in the prior art.
After the end plug 6 is pressed into the open end of the cladding tube 1, welding of the end plug 6 is started by the welding torch 12. After the time t 1 has elapsed after the start of welding in this way,
The timer 25 operates, the electromagnetic on / off valve 20a closes, the electromagnetic on / off valve 23a opens, and the relief
As shown in FIG.
Is raised to close the pressure P 3 by the pressure rise curve P R of the inner, the pressure P a is maintained. By the way, the time t
1 is selected when the maximum pressure difference between the cladding internal pressure and the pressure in the welding chamber 10 reaches a predetermined pressure equal to or lower than the pressure at which the molten metal swells and causes defects, as the cladding internal pressure increases due to welding. I have.
【００２１】このようにして、溶接が進み時間ｔ2 にな
ると、次にタイマー２６が作動し、電磁開閉弁２３ａが
閉じ、電磁開閉弁２４ａが開らかれ、リリーフ弁２４ｂ
が作動状態とされ、そのリリーフ弁２４ｂによって溶接
チャンバー１０内の圧力が、上記被覆管内の圧力上昇に
対応してさらに高い圧力Ｐ4 に保持される。In this way, when the welding progresses to time t 2 , the timer 26 is operated next, the electromagnetic on / off valve 23a is closed, the electromagnetic on / off valve 24a is opened, and the relief valve 24b
There is a working state, the pressure in the welding chamber 10 by the relief valve 24b is held to a higher pressure P 4 in response to a pressure rise in the cladding tube.
【００２２】しかして、溶接中においては溶接チャンバ
ー１０内の圧力が３段階に制御され、被覆管内圧の上昇
曲線ＰR により近い圧力になるように制御される。その
結果被覆管内の圧力と溶接チャンバー内の圧力との差が
大きくなることがなく、前述の如き溶接時における膨れ
欠陥や押込み欠陥が発生することがなく、溶接部全周に
わたって均一で正常な溶接部を得ることができる。[0022] Thus, during the welding is controlled in pressure three stages in the welding chamber 10, is controlled to a pressure closer to the rise curve P R of the cladding pressure. As a result, the difference between the pressure in the cladding tube and the pressure in the welding chamber does not increase, no swelling defect or indentation defect occurs during welding as described above, and uniform and normal welding is performed over the entire circumference of the welded portion. You can get a part.
【００２３】なお、上記実施例においては溶接チャンバ
ー内の圧力を３段階に制御するようにしたものを示した
が、図３にＣ、Ｃ′で示したように、溶接チャンバー１
０の内圧を被覆管１の内圧ＰR に追従して多数段にわた
って順次上昇させ、差圧が欠陥発生最小差圧以内になる
ようにしてもよい。また、段階式でなく図４に線Ｄ、
Ｄ′で示すように連続式加圧制御としてもよく、さらに
多段に圧力調整弁やリリーフ弁を併設せず、例えば時間
と共に圧力をプログラム制御できる機構によって正確に
行なわせることもできる。In the above embodiment, the pressure in the welding chamber is controlled in three stages. However, as shown by C and C 'in FIG.
0 of the internal pressure to follow the internal pressure P R of the cladding tube 1 sequentially increased over a number-stage differential pressure may be made to the defects minimum difference in pressure or. Also, instead of the stepwise formula, the line D in FIG.
As shown by D ', continuous pressurization control may be used. Further, pressure control valves and relief valves may not be provided in multiple stages, and the pressure may be accurately controlled by a mechanism capable of controlling pressure with time, for example.
【００２４】[0024]
【実験例】図５に示すような構造で内径１０mm、肉厚１
mmのジルカロイ−２の管１及び同材質の端栓５、６を用
い、内部にセラミックペレット２及びステンレス鋼製ス
プリング３を装填し、溶接チャンバー１０内で端栓６の
密閉溶接を実施した場合に、従来の溶接法で、管内空隙
にヘリウムガスを１気圧（０．１０１３ＭＰａ）で充填
した後、端栓６を圧入し、然る後図９のｂに示すように
圧力差△Ｐが０．１２５ＭＰａになるように溶接チャン
バー内のヘリウムガス圧を上昇し、溶接を行なったとこ
ろ、溶接全周にわたって膨れ欠陥は完全に防止できた
が、溶接開始点から約１／３周にわたって図１０に示す
ような溶融金属の押込みを生じて全周にわたって均一で
良好な溶接結果は得られなかった。[Experimental example] A structure as shown in FIG.
In the case of using a 1 mm zircaloy-2 tube 1 and end plugs 5 and 6 of the same material, loading a ceramic pellet 2 and a stainless steel spring 3 therein, and performing sealing welding of the end plug 6 in the welding chamber 10. Then, after filling the space inside the pipe with helium gas at 1 atm (0.1013 MPa) by a conventional welding method, the end plug 6 is press-fitted. Then, as shown in FIG. When the helium gas pressure in the welding chamber was raised to 125 MPa and welding was performed, the swelling defect was completely prevented over the entire circumference of the weld. However, FIG. As shown in the figure, the molten metal was indented and uniform and good welding results were not obtained over the entire circumference.
【００２５】一方、上記と同一の溶接手順で、端栓６を
圧入後、溶接開始と共に溶接チャンバー内のヘリウムガ
ス圧を、図３のように予め測定した管内圧上昇曲線ＰR
の圧力より常に差圧が一定範囲（±△Ｐ）即ち線Ｃ、
Ｃ′又はこの間に収まるように段階式に昇圧して溶接し
たところ、溶接全周で膨れ欠陥もなくまた押込み欠陥も
なく、均一で正常な溶接部が得られた。また、溶接チャ
ンバー内のヘリウムガス圧を図４のＤ、Ｄ′のように連
続して直線的に昇圧して溶接した場合も良好な結果が得
られた。On the other hand, in the same welding and procedures, after press-fitting the end plug 6, the helium gas pressure welding chamber with welding start, the internal pressure rise curve P R measured in advance as shown in FIG. 3
Is always within a certain range (± △ P), ie, line C,
When welding was performed by increasing the pressure stepwise so as to fall within C 'or in the meantime, there was no swelling defect and no indentation defect all around the weld, and a uniform and normal weld was obtained. Good results were also obtained when welding was performed by continuously and linearly increasing the helium gas pressure in the welding chamber as shown by D and D 'in FIG.
【００２６】なお、上記実施例においては、各燃料棒の
溶接について説明したが、その他管の内部に種々のガス
を充填して密閉溶接する場合にも適用することができ
る。In the above embodiment, the welding of each fuel rod has been described. However, the present invention can also be applied to a case where various gases are filled in the inside of a pipe and hermetically welded.
【００２７】[0027]
【発明の効果】以上説明したように、本発明において
は、溶接熱による管内圧力の上昇に対応して、上記管に
加えられる外圧を溶接時間の経過とともに順次増圧する
ようにしたので、管の内外の圧力差によって溶接部に膨
れ欠陥或は押込み欠陥等が発生することを確実に防止す
ることができ、高品質の製品を得ることができる。As described above, in the present invention, the external pressure applied to the pipe is sequentially increased with the elapse of welding time in response to the increase in the pipe pressure due to welding heat. It is possible to reliably prevent the occurrence of a swelling defect or an indentation defect in the welded portion due to a pressure difference between the inside and the outside, and to obtain a high quality product.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の溶接装置の概略構成図。FIG. 1 is a schematic configuration diagram of a welding device of the present invention.
【図２】本発明の加圧制御の一例を示す溶接時間と圧力
との関係線図。FIG. 2 is a diagram showing a relationship between welding time and pressure, showing an example of pressurization control of the present invention.
【図３】本発明による溶接チャンバーの階段式圧力上昇
時の溶接時間と圧力との関係線図。FIG. 3 is a diagram showing the relationship between welding time and pressure when a stepwise pressure rise of a welding chamber according to the present invention is performed.
【図４】本発明による溶接チャンバーの連続的圧力上昇
時の溶接時間と圧力との関係線図。FIG. 4 is a diagram showing the relationship between welding time and pressure when the pressure in the welding chamber is continuously increased according to the present invention.
【図５】核燃料棒の縦断面図。FIG. 5 is a longitudinal sectional view of a nuclear fuel rod.
【図６】一般的な核燃料棒の溶接装置を示す図。FIG. 6 is a diagram showing a general nuclear fuel rod welding apparatus.
【図７】ガス圧制御をしないで溶接した場合に生ずる溶
接欠陥を示す溶接部の断面図。FIG. 7 is a sectional view of a weld showing a welding defect that occurs when welding is performed without controlling the gas pressure.
【図８】従来の加圧溶接装置の概略構成図。FIG. 8 is a schematic configuration diagram of a conventional pressure welding apparatus.
【図９】溶接時における燃料棒内圧の変化を示す図。FIG. 9 is a diagram showing a change in fuel rod internal pressure during welding.
【図１０】従来の加圧溶接法による溶接欠陥を示す溶接
部の断面図。FIG. 10 is a sectional view of a weld showing a welding defect by a conventional pressure welding method.
【図１１】従来の溶接法における溶融形態を示す図。FIG. 11 is a view showing a molten state in a conventional welding method.
１ 被覆管 ２ 燃料ペレット ５、６ 端栓 １０ 溶接チャンバー １２ 溶接トーチ １３ 端栓圧入装置 ２０ 充填ガス圧力制御装置 ２３、２４ 溶接チャンバー内圧制御装置 ２０ａ、２３ａ、２４ａ 電磁開閉弁 ２０ｂ、２３ｂ、２４ｂ リリーフ弁 DESCRIPTION OF SYMBOLS 1 Clad pipe 2 Fuel pellet 5, 6 End plug 10 Welding chamber 12 Welding torch 13 End plug press-in device 20 Filling gas pressure control device 23, 24 Welding chamber internal pressure control device 20a, 23a, 24a Electromagnetic on-off valve 20b, 23b, 24b Relief valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 加 納 利 之 神奈川県横須賀市内川二丁目３番１号 日本ニユクリア・フユエル株式会社内 (72)発明者 久 米 智 明 神奈川県横須賀市内川二丁目３番１号 日本ニユクリア・フユエル株式会社内 (56)参考文献 特開 昭60−87978（ＪＰ，Ａ) 特開 平２−6069（ＪＰ，Ａ) 特開 昭63−220980（ＪＰ，Ａ) 特開 昭53−88221（ＪＰ，Ａ) 特公 昭53−38396（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/00 B23K 9/02 B23K 37/00 G21C 21/02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Kano 2-3-1 Kawaguchi, Yokosuka City, Kanagawa Prefecture Inside Nihonkuri Fuyuel Corporation (72) Inventor Tomoaki Kume 2-chome River, Yokosuka City, Kanagawa Prefecture No. 3 No. 1 Inside Nihonkuri Fuyuel Co., Ltd. (56) References JP-A-60-87978 (JP, A) JP-A-2-6069 (JP, A) JP-A-63-220980 (JP, A) JP-A-53-88221 (JP, A) JP-B-53-38396 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) B23K 9/00 B23K 9/02 B23K 37/00 G21C 21/02
Claims (6)
は気体のみを充填し、その後上記管の開口端に端栓を取
付け、その端栓と管とを密封溶接するようにした管の封
緘溶接方法において、溶接熱による管内圧力の上昇に対
応して、溶接時間の経過とともに上記管に加えられる外
圧を管内と前記外圧との差圧が、溶融金属に膨れ欠陥を
生じさせる圧力以下の所定圧力になるように段階的に増
圧することを特徴とする、管の封緘溶接方法。A tube having a closed end filled with a solid substance and gas or gas only, and then an end plug is attached to an open end of the tube, and the end plug and the tube are hermetically welded. In the sealing welding method, in response to an increase in the pressure in the pipe due to welding heat, the external pressure applied to the pipe with the elapse of welding time is equal to or less than the pressure at which the differential pressure between the pipe and the external pressure causes the molten metal to swell and generate defects. A method for sealing and welding a pipe, characterized in that the pressure is increased stepwise to a predetermined pressure.
は気体のみを充填し、その後上記管の開口端に端栓を取
付け、その端栓と管とを密封溶接するようにした管の封
緘溶接方法において、溶接熱による管内圧力の上昇に対
応して、溶接時間の経過とともに上記管に加えられる外
圧を管内と前記外圧との差圧が、溶融金属に膨れ欠陥を
生じさせる圧力以下の所定圧力になるように連続的に増
圧することを特徴とする、管の封緘溶接方法。2. A pipe having one end sealed with a solid substance and gas or gas only, and then an end plug is attached to the open end of the pipe, and the end plug and the pipe are hermetically welded. In the sealing welding method, in response to an increase in the pressure in the pipe due to welding heat, the external pressure applied to the pipe with the elapse of welding time is equal to or less than the pressure at which the differential pressure between the pipe and the external pressure causes the molten metal to swell and generate defects. A method for sealing and welding a pipe, wherein the pressure is continuously increased to a predetermined pressure.
ことを特徴とする、請求項１または２記載の管の封緘溶
接方法。3. The method for sealing and welding a pipe according to claim 1, wherein the solid substance filled in the pipe is a nuclear fuel.
プルトニウムの酸化物セラミック焼結体からなる核燃料
であることを特徴とする、請求項１または２記載の管の
封緘溶接方法。4. The method according to claim 1, wherein the solid material filled in the tube is a nuclear fuel made of a sintered oxide ceramic of uranium or plutonium.
は気体のみを充填し、その後上記管の開口端に端栓を取
付けてその端栓と管とを密封溶接する管の封緘溶接装置
において、少なくとも上記管の開口端部を挿入装着する
溶接チャンバーに、上記溶接チャンバー内の圧力を溶接
熱による管内圧力の上昇に対応して上記管内圧力との差
圧が一定値以内になるように順次増圧する圧力制御装置
を接続したことを特徴とする、管の封緘溶接装置。5. A pipe sealing and welding apparatus for filling a pipe having one end sealed with a solid substance and gas or gas only, and thereafter attaching an end plug to the open end of the pipe and sealingly welding the end plug to the pipe. In at least the welding chamber into which the open end of the pipe is inserted and mounted, the pressure in the welding chamber is adjusted so that the pressure difference between the pipe pressure and the pipe pressure falls within a certain value corresponding to the rise in the pipe pressure due to welding heat. A sealing and welding device for pipes, wherein a pressure control device for sequentially increasing pressure is connected.
と同一圧力を含む所定の差圧内に制御されることを特徴
とする、請求項５記載の管の封緘溶接装置。6. The pipe sealing and welding apparatus according to claim 5, wherein the pressure in the welding chamber is controlled within a predetermined differential pressure including the same pressure as the pressure in the pipe during welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04055388A JP3117778B2 (en) | 1992-03-13 | 1992-03-13 | Pipe sealing welding method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04055388A JP3117778B2 (en) | 1992-03-13 | 1992-03-13 | Pipe sealing welding method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05253668A JPH05253668A (en) | 1993-10-05 |
| JP3117778B2 true JP3117778B2 (en) | 2000-12-18 |
Family
ID=12997131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04055388A Expired - Fee Related JP3117778B2 (en) | 1992-03-13 | 1992-03-13 | Pipe sealing welding method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3117778B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3423682B2 (en) | 2000-10-25 | 2003-07-07 | 株式会社グローバル・ニュークリア・フュエル・ジャパン | Thin-walled cylinder internal pressure sealing method and internal pressure sealed test piece |
| CN102728975A (en) * | 2012-07-06 | 2012-10-17 | 北京中丽制机电气有限公司 | Single-face welding and double-face forming welding fixture of stainless steel end head |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109202213A (en) * | 2017-06-29 | 2019-01-15 | 深圳市腾翼达科技有限公司 | A kind of automatic welded pipe sealing machine |
| CN108500463B (en) * | 2018-05-30 | 2020-07-10 | 连云港市欧雅特照明电器有限公司 | Explosion-proof double-control double-end double-wire halogen heating pipe production device |
-
1992
- 1992-03-13 JP JP04055388A patent/JP3117778B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3423682B2 (en) | 2000-10-25 | 2003-07-07 | 株式会社グローバル・ニュークリア・フュエル・ジャパン | Thin-walled cylinder internal pressure sealing method and internal pressure sealed test piece |
| CN102728975A (en) * | 2012-07-06 | 2012-10-17 | 北京中丽制机电气有限公司 | Single-face welding and double-face forming welding fixture of stainless steel end head |
| CN102728975B (en) * | 2012-07-06 | 2015-06-10 | 北京中丽制机电气有限公司 | Single-face welding and double-face forming welding fixture of stainless steel end head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05253668A (en) | 1993-10-05 |
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