JPS63177963A - Method for welding penstock - Google Patents

Abstract

PURPOSE:To easily form a back bead at the time of welding a first layer in case of outside surface welding, and to eliminate the need of gouging, by installing a backing material to the inside of a groove formed on the inside surface and executing outside surface welding, and subsequently, eliminating the backing material and executing inside surface welding. CONSTITUTION:A backing material 4 is mounted to the inside of a groove from the inside surface side of a penstock 1, and welding is executed from the outside surface. Since the backing material 4 is utilized, a distance (h) extending from a back bead to the surface of an inside surface side plate becomes constant, and the formation of the back bead is also appropriate. As for welding, both its outside surface welding and inside surface welding are constant-current or constant-voltage arc welding which is executed while bringing a welding electrode to a reciprocating rocking in the groove width direction, and the rocking width in the X axis direction at every half period of the rocking is detected. From the value of this rocking width, the desired bead height, the wire feeding speed, the groove angle, etc., the welding speed is determined, and welding for repeating a process for executing the welding of the next half period is executed at this welding speed.

Description

【発明の詳細な説明】 ［産業上の利用分野コ 本発明はペンストックの溶接方法の改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a penstock welding method.

［従来の技術］ ペンストックを現地において溶接する際、先ず開先をと
った外面を溶接した後、内面からガウジングを施して外
面溶接の初層ビードの劣質部分を除去した後内面から溶
接を行うのが、従来行われている通常の方法である。[Conventional technology] When welding penstocks on-site, first weld the outer surface with a groove, then gouge the inner surface to remove the inferior part of the first layer bead of the outer weld, and then weld from the inner surface. This is the conventional method.

［発明が解決しようとする問題点〕 ところで従来の溶接方法において、外面溶接を行った後
、内面からガウジングを行う方法は、先ずガウジングに
手間を要する上、ガウジングによって形成された開先は
その断面形状が不整であるため、一定溶接条件で溶接す
ると、ビード高さが不整となり内面溶接の仕上りが悪く
、内面溶接の自動化が困難であるなどの問題があった。[Problems to be Solved by the Invention] However, in the conventional welding method, gouging is performed from the inner surface after welding the outer surface. First, gouging requires time and effort, and the groove formed by gouging has a narrow cross section. Since the shape is irregular, if welded under constant welding conditions, the bead height will be irregular, resulting in poor internal welding finish, and there are problems such as difficulty in automating internal welding.

本発明は従来の溶接方法における上記問題点を解消する
ためになされたもので、ガウジングを必要とせず自動化
も容易なペンストックの溶接方法を提供しようとするも
のである。The present invention has been made to solve the above-mentioned problems in conventional welding methods, and it is an object of the present invention to provide a penstock welding method that does not require gouging and can be easily automated.

［問題点を解決するための手段］ 上記目的を達成するため、ペンストックの溶接方法にお
いて、外面溶接の際内面開先部に裏当材を装着し外面溶
接の際の初層の裏ビード部の内面側板表面からの高さを
一定ならしめるようにし、その後内面溶接を行う。なお
溶接に当たっては、外面内面とも特開昭６０−２５０８
７７号に開示された溶接方法、すなわち溶接電極を開先
内で幅方向に往復揺動させながら行うアーク溶接であっ
て、上記揺動の各半周期のＸ軸方向の揺動幅Ｗｗを検出
し、この値と所望ビード高さ、ワイヤの供給速度、開先
角度等から溶接速度を決定し、この溶接速度で次の半周
期の溶接を行うプロセスを繰返す溶接方法を用いた。[Means for solving the problem] In order to achieve the above object, in the penstock welding method, a backing material is attached to the inner groove part during outer surface welding, and a backing material is attached to the inner bead part of the first layer during outer surface welding. The height from the surface of the inner side plate is made constant, and then the inner surface is welded. In addition, when welding, both the outer and inner surfaces are
The welding method disclosed in No. 77 is arc welding performed while reciprocating the welding electrode in the width direction within the groove, and the swing width Ww in the X-axis direction of each half cycle of the swing is detected. A welding method was used in which the welding speed was determined from this value, the desired bead height, the wire supply speed, the groove angle, etc., and the process of performing the next half cycle of welding at this welding speed was repeated.

［作用］ ペンストックの溶接を上記方法により行ったので、外面
溶接における初層溶接時の裏ビードの形成が容易となり
、裏ビードから内面側板表面までの高さも一定となりガ
ウジングの必要もなく、自動溶接も可能となった。[Function] Since the pen stock is welded using the above method, it is easy to form a back bead during the first layer welding in the outer surface welding, and the height from the back bead to the surface of the inner side plate is also constant, eliminating the need for gouging and allowing automatic welding. Welding is also possible.

［発明の実施例］ 第１図は本発明の一実施例を示す溶接部の断面図で、１
はペンストック、２はその外面、３はその内面、４は裏
当材、５はビードである。[Embodiment of the invention] Fig. 1 is a sectional view of a welded part showing an embodiment of the invention.
is the pen stock, 2 is its outer surface, 3 is its inner surface, 4 is the backing material, and 5 is the bead.

図に示すように裏当材をペンストック１の内面側から開
先内に装着し、外面から溶接を行う。真当材４を利用す
るため、裏ビードから内面側板表面までの距離りは一定
となり、裏ビードの形成も適切である。As shown in the figure, a backing material is installed into the groove from the inner surface of the pen stock 1, and welding is performed from the outer surface. Since the backing material 4 is used, the distance from the back bead to the inner surface of the side plate is constant, and the back bead is appropriately formed.

なお本発明における溶接においては、その外面溶接内面
溶接ともに、溶接電極を開先幅方向に往復揺動させなが
ら行う定電流又は定電圧アーク溶接であって、上記揺動
の半周期毎Ｘ軸方向の揺動幅Ｗｗを検出し、この値、所
望ビード高さ、ワイヤ供給速度、開先角度等から溶接速
度を決定し、この溶接速度で次の半周期の溶接を行うプ
ロセスを繰返す溶接方法により溶接をおこなっている。In addition, in the welding in the present invention, both the outer surface welding and the inner surface welding are constant current or constant voltage arc welding performed while the welding electrode is oscillated back and forth in the groove width direction, and the welding is performed in the X-axis direction every half cycle of the oscillation. The welding method detects the oscillation width Ww, determines the welding speed from this value, desired bead height, wire feed speed, groove angle, etc., and repeats the process of performing the next half cycle of welding at this welding speed. Welding is being carried out.

なお上記真当材４には、ガラステープ、耐火材あるいは
銅板等を利用することができる。In addition, a glass tape, a fireproof material, a copper plate, or the like can be used as the above-mentioned support material 4.

［発明の効果コ 本発明はペンストックの溶接方法を上記のように構成し
たので、次に述べるような勝れた効果を上げることがで
きた。[Effects of the Invention] Since the penstock welding method of the present invention is configured as described above, the following excellent effects can be achieved.

（１）外面溶接における初層溶接時の裏ビードの形成が
容易となり、ガウジングが不要となった。(1) Formation of a back bead during initial layer welding in external surface welding is facilitated, and gouging is no longer necessary.

（２）裏ビードから内面側板表面までの距離が一定とな
るので、内面溶接が円滑に行われる。(2) Since the distance from the back bead to the surface of the inner side plate is constant, inner welding can be performed smoothly.

（３）自動溶接が可能となる。(3) Automatic welding becomes possible.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す溶接部の断面図である
。 図中１はペンストック、２はその外面、３はその内面、
４は裏当材、５はビードである。 代理人　弁理士　　佐々木　宇治 １：ペンストック ２：イめ外め ３：″″ｔｔハ 内酌裏当材 ５：　ヒ゛−ドFIG. 1 is a sectional view of a welded part showing an embodiment of the present invention. In the figure, 1 is the pen stock, 2 is its outer surface, 3 is its inner surface,
4 is a backing material, and 5 is a bead. Agent Patent Attorney Uji Sasaki 1: Pen stock 2: Removable material 3: ″″tt Cup lining material 5: Head

Claims (2)

【特許請求の範囲】[Claims] （１）両面開先で施工するペンストックの溶接において
、内面に形成した開先内に裏当材を装着して外面溶接を
行い、ついで上記裏当材を除去し、内面のガウジング作
業を行わずに内面溶接を行うことを特徴とするペンスト
ックの溶接方法。(1) When welding a penstock with grooves on both sides, a backing material is attached to the groove formed on the inner surface and the outer surface is welded, then the backing material is removed and the inner surface is gouged. A method of welding a penstock, which is characterized by internal welding. （２）上記外面及び内面の溶接方法が、溶接電極を開先
幅方向に往復揺動させながら行う定電流または定電圧ア
ーク溶接であって、上記揺動の各半周期のＸ軸方向の幅
を検出し、その値と所望ビード高さ、ワイヤ供給速度、
開先角度等から溶接速度を決定し、この溶接速度で次の
半周期の溶接を行う手順を繰返して行う溶接方法である
ことを特徴とする特許請求の範囲第１項記載のペンスト
ック溶接方法。(2) The welding method for the outer and inner surfaces is constant current or constant voltage arc welding, which is performed while the welding electrode is oscillated back and forth in the groove width direction, and the width in the X-axis direction of each half cycle of the oscillation is Detect the value, desired bead height, wire feeding speed,
The penstock welding method according to claim 1, which is a welding method in which the welding speed is determined from the groove angle, etc., and the next half cycle of welding is performed at this welding speed. .