JPS63215375A - Method for welding circumferences of pipes - Google Patents
Method for welding circumferences of pipesInfo
- Publication number
- JPS63215375A JPS63215375A JP4974287A JP4974287A JPS63215375A JP S63215375 A JPS63215375 A JP S63215375A JP 4974287 A JP4974287 A JP 4974287A JP 4974287 A JP4974287 A JP 4974287A JP S63215375 A JPS63215375 A JP S63215375A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- inert gas
- pipes
- tubes
- space
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims description 20
- 239000011261 inert gas Substances 0.000 claims abstract description 29
- 239000011324 bead Substances 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 230000002950 deficient Effects 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000036772 blood pressure Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005493 welding type 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、２本の管の突き合わせ部を、これらを連結す
べく自動溶接する管の円周溶接方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circumferential welding method for pipes in which the abutting portions of two pipes are automatically welded to connect them.
例えば、石油パイプライン又は都市ガス配管等の敷設現
場においては、工場から出荷される定尺の管を突き合わ
せ溶接し、連結して用いる。ところが現場における溶接
作業は、全姿勢溶接を強いられるうえ、十分な作業空間
の確保が困難であることも多く、作業能率が低く、十分
な継手強度を得るためには、高度の溶接技術が要求され
る。そこで前述の如き用途の管は、工場において予め突
き合わせ溶接し、輸送上の制約が許す限りの長尺の管と
して出荷される。For example, at construction sites for oil pipelines, city gas piping, etc., regular length pipes shipped from factories are butt-welded and connected. However, on-site welding work requires welding in all positions, and it is often difficult to secure sufficient work space.Work efficiency is low, and advanced welding techniques are required to obtain sufficient joint strength. be done. Therefore, pipes for the above-mentioned purposes are butt-welded in advance at a factory and shipped as long pipes as long as transportation constraints permit.
このような場合に用いる管の円周溶接装置として、本発
明者らによる特願昭６１−７６００４号の発明がある。As a pipe circumferential welding device used in such cases, there is an invention disclosed in Japanese Patent Application No. 1983-76004 by the present inventors.
これは、その外周にアウタリングが装着された２本の管
の管端部を互いに突き合わせ、突き合わせ部の内部に、
管端の相対移動を拘束すべくインナクランプ装置を装着
し、更にこれらの管の管端部近傍の内部に夫々シールド
板を装着して、これらと前記２本の管の内壁とにて囲ま
れた空間内に不活性ガスを導入し、前記アウタリングに
転接する駆動ローラにてこれらの管を回転させつつ、前
記突き合わせ部の外側に位置し、これに倣う溶接トーチ
にて、該突き合わせ部の外周を自動的に溶接するもので
あり、溶接に先立って行われていた突き合わせ部の仮付
は作業が不要となり、目違い量の調整等の準備作業が大
幅に簡略化される等の効果を有している。This is done by abutting the ends of two tubes with outer rings attached to their outer peripheries, and inserting a
An inner clamp device is installed to restrain the relative movement of the tube ends, and a shield plate is installed inside each of these tubes near the tube ends, so that the tubes are surrounded by these and the inner walls of the two tubes. Inert gas is introduced into the space, and while these tubes are rotated by a drive roller that rolls into contact with the outer ring, a welding torch located outside the abutting portion and following the abutting portion is used to weld the abutting portion. The outer periphery is automatically welded, eliminating the need to temporarily attach the butted parts prior to welding, and greatly simplifying preparatory work such as adjusting the misalignment amount. have.
さて、前述した管の円周溶接装置によって溶接を行う場
合、前記不活性ガスは、溶接部の裏側を該ガスの雰囲気
に保ち、良好な裏波ビードを形成せしめるべく作用する
が、該ガスは、突き合わせ部における管端の間隙から外
部に徐々に漏出する一方、この間隙は、溶接が進行する
に伴いビードによって閉塞され、その面積が減少する結
果、前記不活性ガスの漏出量が、溶接の進行に伴って変
化し、部分的な裏波ビード形状の不良個所が生ずる虞が
あり、ビードが管の内周面から内向きに突出した場合、
溶接終了後にこの突出部をグラインダにて除去する煩わ
しさがあり、逆に、ビードが管の内周面よりも外向きに
退行した場合、特に肉厚が２Ｏｎ＋ｎ＋を超える厚肉管
においては、これを手直しするには、特殊な技術と多大
の時間とを要するため・一旦溶接部を切断して再度開先
加工を施した後、再溶接を行う必要があって、いずれの
場合においても作業能率の大幅な低下を招来するという
難点があった。Now, when welding is performed using the pipe circumferential welding device described above, the inert gas acts to keep the back side of the welded part in an atmosphere of the gas and form a good uranami bead. , the inert gas gradually leaks to the outside from the gap between the pipe ends at the abutting part, while this gap is closed by the bead as welding progresses, and its area decreases. As a result, the leakage amount of the inert gas If the bead protrudes inward from the inner circumferential surface of the pipe, there is a risk that the bead will change as it progresses and a defective part of the Uranami bead shape may occur.
It is troublesome to remove this protruding part with a grinder after welding is completed, and conversely, if the bead regresses outward from the inner circumferential surface of the pipe, this problem may occur, especially in thick-walled pipes with a wall thickness exceeding 2On+n+. It takes special techniques and a lot of time to repair the weld, so it is necessary to cut the weld, re-bevel, and then re-weld, which reduces work efficiency. The problem was that this resulted in a significant decrease in
本発明は、斯かる事情に鑑みてなされたものであり、常
に良好な裏波ビードの形成がなされる管の円周溶接方法
を提供することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for circumferential welding of pipes in which a good underwave bead is always formed.
本発明に係る管の円周溶接方法は、２本の管の管端部を
互いに突き合わせ、該管端部近傍の前記２本の管の内部
に夫々シールド板を装着して、これらと前記２本の管の
内壁とにて囲まれる空間を形成し、該空間内に不活性ガ
スを通流せしめつつ、前記管端部の外周を自動溶接する
管の円周溶接方法であって、溶接部における裏波ビード
の形状を良好に保つべく、前記空間の内部における前記
不活性ガスの圧力に応じて、該ガスの通流量を制御する
ことを特徴とする。In the method for circumferential welding of pipes according to the present invention, the pipe ends of two pipes are butted against each other, and a shield plate is installed inside each of the two pipes in the vicinity of the pipe ends, and the two pipes are connected to each other. A method for circumferential welding of a pipe, in which a space is formed surrounded by the inner wall of a main pipe, and the outer periphery of the pipe end is automatically welded while an inert gas is passed through the space, the welding part being In order to maintain a good shape of the Uranami bead, the flow rate of the gas is controlled according to the pressure of the inert gas inside the space.
本発明においては、突き合わせ部の間隙からの漏れ量に
応じて変動する前記空間内の不活性ガスの圧力に応じて
、該ガスの通流量を変更して、溶接が行われている間、
良好な裏波ビードが形成されるように、溶接部の裏側の
状態を所定の状態に保つ。In the present invention, while welding is being performed, the flow rate of the gas is changed in accordance with the pressure of the inert gas in the space, which varies depending on the amount of leakage from the gap between the butt parts.
Keep the back side of the weld in a predetermined condition so that a good Uranami bead is formed.
以下本発明をその実施例を示す図面に基づいて詳述する
。第１図は溶接対象である管の突き合わせ部近傍の一部
破断側面図と共に示す、本発明に係る管の円周溶接方法
（以下本発明方法という）の実施状態を示す模式図であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a schematic diagram illustrating a state in which a circumferential welding method for pipes according to the present invention (hereinafter referred to as the method of the present invention) is shown together with a partially cutaway side view of the vicinity of the abutting portion of the pipe to be welded.
図においてｌａ、 ｌｂは、本発明方法に従って、これ
らの突き合わせ部５を円周溶接される管であり、該管１
ａ、 ｌｂの外周面には、アウタリング２が、後述する
手順にて装着され、該アウタリング２を介して、駆動ロ
ーラ台３上に、軸心を水平として支持されている。In the figure, la and lb are tubes whose abutting portions 5 are circumferentially welded according to the method of the present invention, and the tube 1 is
An outer ring 2 is attached to the outer circumferential surfaces of the rollers a and lb in a procedure described later, and is supported via the outer ring 2 on a drive roller stand 3 with its axis being horizontal.
駆動ローラ台３は、前記管１ａ、 ｌｂを、軸心を水平
とし、夫々の軸心を一致させて支持すべく、同一直線上
に４個並設されており、これらの内の２個にて夫々支持
させた前記管１ａ、 ｌｂを互いに近接又は離反せしめ
るべく、前記並設の方向に夫々水平移動可能となってい
る。該駆動ローラ台３の上部には、これらの並設方向と
平行な枢軸廻りに回動自在に枢支され、図示しない駆動
モータによって回転する各２個の駆動ローラ３０，３０
が、前記並設方向と直交する方向に適長離隔させて設け
である。Four drive roller stands 3 are arranged in parallel on the same straight line in order to support the tubes 1a, lb with their axes aligned horizontally and with their axes aligned. The tubes 1a and lb supported by the tubes can be moved horizontally in the direction of the juxtaposition in order to bring them closer to or away from each other. Two drive rollers 30, 30 each are rotatably supported on the upper part of the drive roller stand 3 around a pivot axis parallel to the direction in which these drive rollers are arranged, and are rotated by a drive motor (not shown).
are spaced apart by an appropriate length in a direction perpendicular to the direction of juxtaposition.
また前記アウタリング２は、管１ａ、ｌｂの外径よりも
大なる内径を有し、外周面を略真円に加工されてなる短
寸円筒状をなす部材であり、その軸心を含む一面で二つ
割り可能となっている。該アウタリング２の軸長方向の
略中央部には、複数個のねじ孔２０，２０・・・が、半
径方向外向きに、等配をなして形成され、これらには、
夫々ジヤツキボルト２１が内周面側から螺合され、該ジ
ヤツキボルト２１の内向き端部には、押さえ部材２２が
固着されている。このように構成されたアウタリング２
は、前配管１ａの突き合わせ側の管端部からその軸長方
向に適長離隔した位置において、第１図に示す如く、そ
の二つ割りされた両半部にて液管１ａの外側を包囲させ
た後、両者の合わせ面を整合させ、合わせ部をボルトナ
ツト２３にて固定して一体化され、次いで前記ジヤツキ
ボルト２０．２０・・・を各別に螺進させ、各ジヤツキ
ボルト２１の押さえ部材２２にて、管ｌａの外周面を把
持せしめて、液管１ａの外側にこれと同心をなして装着
される。また第１図には図示しないが、管１ａの他側の
管端部からその軸長方向に適長離隔した位置、及び管１
ｂの両管端部から同様に離隔した位置にも前記アウタリ
ング２と同一構成のアウタリング２が、前述の手順にて
夫々装着されている。The outer ring 2 is a short cylindrical member having an inner diameter larger than the outer diameter of the tubes 1a and lb, and whose outer peripheral surface is processed into a substantially perfect circle. It can be divided into two. A plurality of screw holes 20, 20, .
A jack bolt 21 is screwed together from the inner circumferential side of each bolt, and a pressing member 22 is fixed to the inward end of the jack bolt 21. Outer ring 2 configured in this way
As shown in Fig. 1, the outer side of the liquid pipe 1a is surrounded by both halves of the front pipe 1a at a position a suitable length away from the butt-side pipe end of the front pipe 1a in the axial direction. After that, the mating surfaces of both are aligned, and the mating parts are fixed with bolts and nuts 23 to be integrated, and then the jack bolts 20, 20, etc. are screwed in separately, and the pressing member 22 of each jack bolt 21 is used to It is attached to the outside of the liquid tube 1a concentrically by gripping the outer peripheral surface of the tube 1a. Although not shown in FIG.
Outer rings 2 having the same structure as the outer ring 2 are also installed at positions similarly spaced apart from both ends of the tubes in the same manner as described above.
このように各２個のアウタリング２を装着された前記管
１ａ及び管１ｂは、アウタリング２の装着位置に応じて
その移動方向位置を適宜に設定された前記駆動ローラ台
３上に、アウタリング２の外周面に前記駆動ローラ３０
，３０を転接させて、各別に支持され、該ローラ３０．
３０の回転に応じて同一の軸心廻りに同速度にて回転す
る。The tubes 1a and 1b each having two outer rings 2 attached thereto are placed on the drive roller stand 3 whose movement direction position is appropriately set according to the attachment position of the outer rings 2. The drive roller 30 is attached to the outer peripheral surface of the ring 2.
, 30 are rotated and supported separately, and the rollers 30 .
30, it rotates around the same axis at the same speed.
また、図において４は、管１ａ、 ｌｂの内径よりも小
なる外径を有し、短寸円筒状をなすクランプ本体４０と
、該本体４０の両端部近傍に、円周方向に略等配をなし
、半径方向内向きに２列をなして形成された複数のねし
孔４３．４３・・・に、クランプ本体４０の外周面側か
ら夫々螺合され、その外向き端部に押さえ部材４２を固
着されてなる複数個のジヤツキボルト４１．４１・・・
とから構成されたインナクランプ装置であって、該装置
４は、突き合わせ部５とその位置を整合されて管１ａ、
Ｉｂの内部に挿入され、該位置においてジヤツキボル
ト４１．４１・・・を各別に螺進させることによって、
第１図に示す如く、管１ａの内周面を一列のジヤツキボ
ルト４１．４１・・・にて、また管１ｂの内周面を他側
のジヤツキボルト４１．４１・・・にて、夫々前記押さ
え部材４２を介して拘持して、管１ａと管１ｂとの間の
軸長方向及び半径方向の相対移動を拘束すると共に、突
き合わせ部５における目違い量を調節すべく装着されて
いる。In the figure, reference numeral 4 denotes a short cylindrical clamp body 40 having an outer diameter smaller than the inner diameter of the tubes 1a and 1b, and a clamp body 40 that is approximately equally spaced in the circumferential direction near both ends of the body 40. The clamp body 40 is screwed into a plurality of threaded holes 43, 43 formed in two rows inward in the radial direction from the outer circumferential surface side of the clamp body 40, and a presser member is attached to the outer end thereof. A plurality of jack bolts 41, 41...
An inner clamp device comprising: a tube 1a;
By inserting it into the inside of Ib and screwing the jack bolts 41, 41...individually at the respective positions,
As shown in FIG. 1, the inner circumferential surface of the tube 1a is held down by a row of jack bolts 41, 41..., and the inner circumferential surface of the tube 1b is held down by the other jack bolts 41, 41..., respectively. It is held in place via a member 42 to restrict relative movement in the axial direction and radial direction between the tubes 1a and 1b, and is attached to adjust the amount of misalignment at the abutting portion 5.
また６は、矩形平板状をなし、その下面に溶接トーチ７
を下向きに固設してなるトーチ支持体であり、該支持体
６は、管１ａ、ｌｂＯ軸心を含む平面内において、溶接
トーチ７と突き合わせ部５との間の離隔距離を適宜に設
定せしめるべく、図示しない駆動機構にて鉛直上下方向
に移動可能となっている。このトーチ支持体６の前記溶
接トーチ７の固設位置から管Ｉｂ寄りの下面には、倣い
体１０が下向きに突設しである。該倣い体１０は、第１
図に示す如（、突き合わせ部５からその軸長方向に所定
長離隔した管１ｂの外周面にこれとその軸心を一致させ
て装着され、中抜き円板状をなす倣いリング１１をその
両側から把持し、溶接トーチ７に対する管１ｂのその軸
長方向への相対移動を、該リング１１を介して拘束する
。Further, 6 has a rectangular flat plate shape, and a welding torch 7 is attached to the bottom surface of the plate.
The support body 6 is a torch support body formed by fixing the welding torch 7 and the abutting portion 5 downward, and the support body 6 allows the separation distance between the welding torch 7 and the abutting portion 5 to be appropriately set in a plane including the axis of the pipe 1a and lbO. Therefore, it can be moved vertically up and down by a drive mechanism (not shown). A copying body 10 is provided to protrude downward from the lower surface of the torch support 6 near the pipe Ib from the fixed position of the welding torch 7. The copying body 10 is a first
As shown in the figure, a copying ring 11 in the shape of a hollow disc is attached to the outer circumferential surface of the tube 1b, which is spaced a predetermined distance from the abutting portion 5 in the axial direction, so that its axis coincides with the outer circumferential surface of the tube 1b. The ring 11 restrains the pipe 1b from moving relative to the welding torch 7 in its axial direction.
更に、突き合わせ部５側の管端部から夫々の軸長方向に
適長離隔した管１ａ及び管１ｂの内部には、これらの内
径よりもやや小なる外径の円板であるシールド板８及び
同９が夫々装着されている。該シールド板８．９の外周
には、内部に空気を圧入されて膨張するタイヤチューブ
状のゴム製のシールドリング８０．９０が夫々巻着して
あり、該シールド板８，９は、管１ａ又は管１ｂに内挿
された後、前記シールドリング８０．９０に空気を圧入
し、該リング８０．９０を管１ａ、ｌｂの内周面に夫々
圧着せしめることにより、液管１ａ、ｌｂの軸心と略直
交する状態に固定され、これらと管１ａ＋ ｔｂとによ
り囲１１された空間を形成する。Further, inside the tubes 1a and 1b, which are spaced apart from each other by an appropriate length in the axial direction from the tube ends on the side of the abutting portion 5, there are shield plates 8 and 8, which are disks having an outer diameter slightly smaller than the inner diameter of the tubes 1a and 1b. 9 is installed on each. Tire tube-shaped rubber shield rings 80 and 90, which are inflated by pressurizing air into the inside, are wound around the outer periphery of each of the shield plates 8 and 9, respectively. Alternatively, after the shield rings 80.90 are inserted into the pipes 1b, air is pressurized into the shield rings 80.90, and the rings 80.90 are crimped onto the inner peripheral surfaces of the pipes 1a and 1b, respectively, so that the axes of the liquid pipes 1a and lb can be fixed. They are fixed in a state substantially orthogonal to the center, and a space 11 surrounded by these and tubes 1a+tb is formed.
前記シールド板８．９の略中心部には、ガス通流孔８１
．９１が貫通形成してあり、一方の通流孔８１には、他
端をＡｒ、Ｎ２等の不活性ガスを内蔵する図示しないガ
ス容器に連結させてなるガス導入ホース１２の一端が連
結され、他方の通流孔９１には、他端を大気に開放され
てなるガス導出ホース１４の一端が、電磁弁１３を介し
て連結されている。A gas passage hole 81 is provided approximately at the center of the shield plate 8.9.
．． A gas introduction hose 12 is connected to one end of the gas introduction hose 12, the other end of which is connected to a gas container (not shown) containing an inert gas such as Ar or N2, to one of the communication holes 81. One end of a gas discharge hose 14 whose other end is open to the atmosphere is connected to the other communication hole 91 via the electromagnetic valve 13 .
またシールド板９の適宜位置には、血圧孔１５が貫通形
成されており、該血圧孔１５には、シールド板８，９と
管１ａ、 ｌｂとにて囲繞された空間内における前記不
活性ガスの圧力を検出すべく、例えば歪ゲージ弐の圧力
変換器１６が装着してあり、該変換器１６は、この検出
値に応じたレベルの信号を制一部１７へ出力する。制御
部１７は、この圧力変換器１６からの信号に応じて、前
記空間内の圧力を予め設定された所定の範囲内に維持す
べく、前記電磁弁１３へ、これを開閉せしめる信号を出
力する。Further, a blood pressure hole 15 is formed through the shield plate 9 at an appropriate position, and the blood pressure hole 15 is filled with the inert gas in the space surrounded by the shield plates 8, 9 and the tubes 1a, lb. For example, a pressure transducer 16 of strain gauge 2 is installed to detect the pressure of , and the transducer 16 outputs a signal at a level corresponding to this detected value to the control section 17 . In response to the signal from the pressure transducer 16, the control unit 17 outputs a signal to the solenoid valve 13 to open and close it in order to maintain the pressure in the space within a predetermined range set in advance. .
さて以上の如く構成された管の円周溶接装置を用い、本
発明方法を実施する手順について説明する。溶接作業を
開始するに先立ち、まず溶接対象である管１ａ、 ｌｂ
の管端部近傍の外周に、前述の如（各２個のアウタリン
グ２を装着し、これらの装着位置に応じて、前記駆動ロ
ーラ台３を移動させた後、各アウタリング２の外周面に
、夫々の装着位置に対応する駆動ローラ台３上の駆動ロ
ーラ３０゜３０を転接せしめて、前記管１ａ、ｌｂを軸
心を水平として駆動ローラ台３に支持させる。次いで前
記駆動ローラ３０．３０の回転により、管１ａ又は管１
ｂを低速回転させつつ、これらの突き合わせ部５側の管
端部の水平及び鉛直方向の変位を調べ、これらを所定の
許容範囲内の値とすべく、前記ジヤツキボルト２１．２
１・・・を各別に調節する。これにより、管１ａ又は管
１ｂの曲りに起因して、これらの回転中に生ずる、突き
合わせ部５の溶接トーチ７に対する半径方向の相対変位
が微小に保たれ、溶接ワイヤの突き出し長さが略一定に
保たれる結果、溶接欠陥を生ずることなく以後の溶接が
行える。Now, the procedure for carrying out the method of the present invention using the tube circumferential welding apparatus constructed as described above will be explained. Before starting welding work, first weld the pipes 1a and lb.
After attaching two outer rings 2 to the outer periphery near the pipe end as described above and moving the drive roller stand 3 according to the attachment positions, the outer circumferential surface of each outer ring 2 is Then, the drive rollers 30 30 on the drive roller stand 3 corresponding to the mounting positions are brought into contact with each other, and the tubes 1a and 1b are supported on the drive roller stand 3 with their axes horizontal.Next, the drive rollers 30 With a rotation of .30, tube 1a or tube 1
While rotating the bolt 21.2 at a low speed, check the horizontal and vertical displacements of the pipe ends on the butt portion 5 side, and in order to bring these values within a predetermined tolerance range,
1... Adjust each separately. As a result, the relative displacement of the butt portion 5 in the radial direction with respect to the welding torch 7, which occurs during the rotation of the pipe 1a or the pipe 1b due to the bending thereof, is kept small, and the protruding length of the welding wire is kept approximately constant. As a result, subsequent welding can be performed without causing welding defects.
その後、前記倣いリング１１を管１ｂの外周面の所定位
置に装着すると共に、液管１ｂの内部に、突き合わせ部
５側の管端部から、インナクランプ装置４の半部を挿入
し、前述の如くジヤツキボルト４１゜４１・・・を螺進
させて、これを管１ｂの内周面に装着する。次いで、管
１ａを支持する駆動ローラ台３，３と管１ｂを支持する
駆動ローラ台３，３とを各別に移動させ、管１ａの管端
と管１ｂの管端とを互いに近付け、両者を所定の間隙を
隔てて突き合わせると共に、突き合わせ部５を、第１図
に示す如く、前記溶接トーチ７の直下に位置させる。こ
の時、管１ａの内部に、突き合わせ部５側の管端部から
、前記インナクランプ装置１４０半部が挿入された状態
となっており、該装置４の２列のジヤツキボルト４１．
４１・・・を各別に螺進せしめて、これにより、突き合
わせ部５における目違い量を適正範囲内の値とすべく、
管１ａ及び管１ｂの局所的な変形又は全体的なゆがみを
矯正すると共に、管１ａ、 ｌｂの軸長方向への相対変
位を拘束する。Thereafter, the copying ring 11 is attached to a predetermined position on the outer circumferential surface of the tube 1b, and the half of the inner clamp device 4 is inserted into the liquid tube 1b from the tube end on the abutting portion 5 side, and the above-mentioned Screw the jack bolts 41, 41, etc., and attach them to the inner circumferential surface of the pipe 1b. Next, the drive roller stands 3, 3 that support the tube 1a and the drive roller stands 3, 3 that support the tube 1b are moved separately to bring the tube ends of the tube 1a and the tube ends of the tube 1b closer to each other, so that they are separated. They are butted against each other with a predetermined gap therebetween, and the abutted portion 5 is located directly below the welding torch 7, as shown in FIG. At this time, half of the inner clamp device 140 is inserted into the tube 1a from the tube end on the butt portion 5 side, and the two rows of jack bolts 41.
41... are individually screwed in, thereby making the amount of misalignment at the abutting portion 5 within an appropriate range,
It corrects local deformation or overall distortion of tubes 1a and 1b, and restrains relative displacement of tubes 1a and lb in the axial direction.
その後、管１ａ、１ｂの内周面の適宜位置に、前記シー
ルド板８，９を、夫々前述の如く装着し、更に、溶接ト
ーチ７の下端部が突き合わせ部５から所定長上方に位置
するまで、前記トーチ支持体６を下動させ、倣い体１０
にて、前記倣いリング１１を把持せしめて、本発明方法
の実施に先立つ準備作業を終了する。Thereafter, the shield plates 8 and 9 are attached to appropriate positions on the inner circumferential surfaces of the tubes 1a and 1b, respectively, as described above, until the lower end of the welding torch 7 is located a predetermined distance above the abutting portion 5. , move the torch support 6 downward, and move the copying body 10
At this point, the copying ring 11 is gripped, and the preparatory work prior to implementing the method of the present invention is completed.
準備作業終了後、前記ガス容器に設けた弁を開放し、該
容器に内蔵された不活性ガスを、前記ガス導入ホース１
２を通して、シールド板８，９及び管１ａ、 ｌｂにて
囲繞された空間に導入すると共に、各駆動ローラ３０，
３０・・・を、所定の速度にて同期的に回転させ、各ア
ウタリング２を介して管１ａ、１ｂを回転させる。同時
に溶接トーチ７に図示しない電源から電力を供給し、該
トーチ７の直下に位置する突き合わせ部５を、管１ａ、
ｌｂの回転速度に応じた溶接速度にて円周溶接する。After the preparation work is completed, the valve provided in the gas container is opened, and the inert gas contained in the container is transferred to the gas introduction hose 1.
2 into a space surrounded by shield plates 8, 9 and tubes 1a, lb, and each drive roller 30,
30... are rotated synchronously at a predetermined speed, and the tubes 1a and 1b are rotated via each outer ring 2. At the same time, power is supplied to the welding torch 7 from a power source (not shown), and the butt part 5 located directly below the welding torch 7 is connected to the pipe 1a,
Circumferential welding is performed at a welding speed that corresponds to the rotational speed of lb.
この間、突き合わせ部５における管１ａの管端部と管１
ｂの管端部との間隙から、前記空間内に導入された不活
性ガスが漏出するが、この漏出量は、前記不活性ガスの
圧力及び前記間隙の面積に応じて変動し、導入量が一定
に保たれている場合には、溶接の進行に伴って前記間隙
がビードによって閉塞され、該間隙の面積が徐々に減少
する結果、漏出量が減少し、前記空間内における不活性
ガスの圧力が上昇する。制御部１７は、前記圧力変換器
１６の検出結果に応じて、電磁弁１３の開度を自動調節
し、前記不活性ガスの一部をガス導出ホース１４から外
部に導出させ、前記空間内の不活性ガスの圧力を、予め
設定された所定の範囲内に維持すべく動作する。During this time, the tube end of the tube 1a at the abutting portion 5 and the tube 1
The inert gas introduced into the space leaks from the gap with the pipe end of b, but the amount of leakage varies depending on the pressure of the inert gas and the area of the gap, and the amount introduced is If it is kept constant, the gap is closed by the bead as welding progresses, and the area of the gap gradually decreases, resulting in a decrease in the amount of leakage and the pressure of the inert gas in the space. rises. The control unit 17 automatically adjusts the opening degree of the electromagnetic valve 13 according to the detection result of the pressure transducer 16, causes a part of the inert gas to be led out from the gas outlet hose 14, and removes the inside of the space. It operates to maintain the pressure of the inert gas within a predetermined range.
前述の圧力の設定範囲は、外部から変更することが可能
であり、溶接すべき管の材質及び溶接条件に対応する溶
接実績に基づいて経験的に決定されるものである。The pressure setting range described above can be changed from the outside and is determined empirically based on welding results corresponding to the material of the pipe to be welded and the welding conditions.
第２図は、以下に示す溶接条件のもとて本発明方法に従
って円周溶接を行った場合の、前記不活性ガスの圧力と
、裏波ビードの形成状態との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the pressure of the inert gas and the state of formation of the Uranami bead when circumferential welding is performed according to the method of the present invention under the welding conditions shown below.
管の材質 ５ＵＳ３０４ 溶接の種別 ＴＩＧ溶接
外径 ２５ＯＡ 溶接電流 １２０〜２５０
Ａ肉厚 ２５璽ｌ 溶接電圧 １１〜１５ Ｖ溶
接速度 １００ ｍｍ／ｍｉｎ
溶接棒の材質 ５Ｕ３３０８
直径 １．０ｍｍ
本図において、裏波ビード高さＨは、裏波ビードが管の
内周面から内向きに突出した場合を正、逆の場合を負と
して示しである。裏波ビードの形状は、Ｏｗｍ≦Ｈ≦＋
１．５鶴の範囲において良好であると判断され、本図か
ら明らかな如く、前述の溶接条件のもとにおいては、シ
ールド板８．９と、管１ａ、 ｌｂとにて囲繞された前
記空間内における不活性ガスの圧力を、０．１ ｋｇ／
ｃｄＧシ０．３７ｋｇ／ｃ＋ＪＧの範囲に維持すること
により、良好な裏波ビードの形成が可能である。従って
、前記範囲内に含まれる適宜の設定範囲を前記制御部１
７に設定することにより、突き合わせ部５の全周にわた
る溶接が完了するまで、溶接部分の裏側の不活性ガスの
圧力が良好な裏波ビードの形成に適した状態に維持され
、突き合わせ部５の全長にわたって、良好な裏波ビード
が形成される。Pipe material 5US304 Type of welding TIG welding Outer diameter 25OA Welding current 120-250
A Wall thickness: 25 l Welding voltage: 11 to 15 V Welding speed: 100 mm/min Welding rod material: 5U3308 Diameter: 1.0 mm In this figure, the uranami bead height H is the distance between the uranami bead and the inner surface of the tube. The case where it protrudes in the direction is shown as positive, and the case in the opposite direction is shown as negative. The shape of the Uranami bead is Owm≦H≦＋
As is clear from this figure, under the above-mentioned welding conditions, the space surrounded by the shield plate 8.9 and the tubes 1a and lb. The pressure of the inert gas in the
By maintaining cdG in the range of 0.37 kg/c+JG, it is possible to form a good Uranami bead. Therefore, the controller 1 sets an appropriate setting range included in the range.
By setting the value to 7, the pressure of the inert gas on the back side of the welding part is maintained in a state suitable for forming a good uranami bead until welding over the entire circumference of the butting part 5 is completed, and A good Uranami bead is formed over the entire length.
全く同様に、他の溶接条件のもとて溶接を行う場合には
、該条件又はこれに近い溶接条件における溶接実績に基
づいて、制御部１７に設定すべき範囲を決定すればよい
。In exactly the same way, when welding is performed under other welding conditions, the range to be set in the control section 17 may be determined based on the welding results under these conditions or similar welding conditions.
以上詳述した如く本発明方法においては、端部を互いに
突き合わされた２本の管と、これらの内部に夫々装着さ
れたシールド板とにて囲まれた空間内に、不活性ガスを
通流させ、この通流量を、前記空間内の圧力に応じて変
更して、突き合わせ部の溶接が行われている間、溶接部
の裏側における不活性ガスの圧力を、良好な裏波ビード
の形成に適した状態に維持するから、突き合わせ部の円
周の全長に良好な裏波ビードが形成され、溶接終了後に
おける不良個所の手直しが不要となり、作業能率が大幅
に向上すると共に、溶接部の信幀性が向上する等価れた
効果を奏する。As detailed above, in the method of the present invention, an inert gas is passed through a space surrounded by two tubes whose ends are butted against each other and shield plates installed inside each tube. The flow rate is changed according to the pressure in the space to maintain the pressure of the inert gas on the back side of the weld while welding the butt part to form a good uranami bead. By maintaining the proper condition, a good Uranami bead is formed along the entire circumference of the butt part, eliminating the need to repair defective areas after welding is completed, greatly improving work efficiency, and improving the reliability of the welded part. It has the same effect as improving the cost performance.
図面は本発明の一実施例を示すものであり、第１図は本
発明方法の実施状態を示す模式図、第２図は本発明方法
に従って円周溶接を行った場合の不活性ガスの圧力と裏
波ビードの形成状態との関係を示すグラフである。
ｌａ、 ｌｂ・・・管 ５・・・突き合わせ部 ７
・・・溶接トーチ ８．９・・・シールド板 １２
・・・ガス導入管 １３・・・電磁弁 １４・・・
ガス導出管 １６・・・圧力変換器 １７・・・制
御部
特 許 出願人 住友金属工業株式会社代理人 弁理
士 河 野 登 電圧 ｈ
第２図The drawings show one embodiment of the present invention, and Fig. 1 is a schematic diagram showing the implementation state of the method of the present invention, and Fig. 2 shows the pressure of inert gas when circumferential welding is performed according to the method of the present invention. It is a graph which shows the relationship between and the formation state of the Uranami bead. la, lb...tube 5...butt part 7
...Welding torch 8.9...Shield plate 12
...Gas introduction pipe 13...Solenoid valve 14...
Gas outlet pipe 16...Pressure transducer 17...Control unit patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Noboru Kono Voltage h Fig. 2
Claims (1)
傍の前記２本の管の内部に夫々シールド板を装着して、
これらと前記２本の管の内壁とにて囲まれる空間を形成
し、該空間内に不活性ガスを通流せしめつつ、前記管端
部の外周を自動溶接する管の円周溶接方法であって、 溶接部における裏波ビードの形状を良好に 保つべく、前記空間の内部における前記不活性ガスの圧
力に応じて、該ガスの通流量を制御することを特徴とす
る管の円周溶接方法。[Scope of Claims] The tube ends of one or two tubes are butted against each other, and a shield plate is installed inside each of the two tubes near the tube ends,
A method for circumferential welding of tubes, in which a space surrounded by these and the inner walls of the two tubes is formed, and the outer periphery of the tube ends is automatically welded while an inert gas is passed through the space. A method for circumferential welding of pipes, characterized in that the flow rate of the inert gas is controlled in accordance with the pressure of the inert gas inside the space in order to maintain a good shape of the uranami bead in the welded part. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4974287A JPS63215375A (en) | 1987-03-03 | 1987-03-03 | Method for welding circumferences of pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4974287A JPS63215375A (en) | 1987-03-03 | 1987-03-03 | Method for welding circumferences of pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63215375A true JPS63215375A (en) | 1988-09-07 |
Family
ID=12839639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4974287A Pending JPS63215375A (en) | 1987-03-03 | 1987-03-03 | Method for welding circumferences of pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63215375A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304776A (en) * | 1993-03-24 | 1994-04-19 | Steven R. Buerkel | System for welding pipes |
| US5390846A (en) * | 1993-08-11 | 1995-02-21 | Thode; Jonathan E. | Welding gas purging apparatus and method |
-
1987
- 1987-03-03 JP JP4974287A patent/JPS63215375A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5304776A (en) * | 1993-03-24 | 1994-04-19 | Steven R. Buerkel | System for welding pipes |
| US5390846A (en) * | 1993-08-11 | 1995-02-21 | Thode; Jonathan E. | Welding gas purging apparatus and method |
| US5425492A (en) * | 1993-08-11 | 1995-06-20 | Edward F. Thode | Welding gas purging apparatus and method |
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