JP3327514B2 - Gas shield welding equipment for ERW steel pipes - Google Patents
Gas shield welding equipment for ERW steel pipesInfo
- Publication number
- JP3327514B2 JP3327514B2 JP05898597A JP5898597A JP3327514B2 JP 3327514 B2 JP3327514 B2 JP 3327514B2 JP 05898597 A JP05898597 A JP 05898597A JP 5898597 A JP5898597 A JP 5898597A JP 3327514 B2 JP3327514 B2 JP 3327514B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pipe
- welding
- shield
- steel pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電縫鋼管をガスシ
ールド溶接する装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for gas shield welding an ERW steel pipe.
【０００２】[0002]
【従来の技術】電縫鋼管は誘導加熱により、オープンパ
イプのエッジ部を加熱し、直ちにスクイズロールで加圧
・接合して製造する。製造された電縫鋼管の内面側に
は、図４に示すように、溶接後の電縫鋼管１内面に生成
されるビード２を切削するための治具３や、溶接時にお
ける加熱効率を向上させる機能をもつインピーダーコア
４とそれを覆うインピーダーケース５や、切削抵抗の支
持体となるバー等を組み込んだ工具、通称マンドレル６
が挿入されている。2. Description of the Related Art An electric resistance welded steel pipe is manufactured by heating the edge of an open pipe by induction heating and immediately pressing and joining the pipe with a squeeze roll. As shown in FIG. 4, the jig 3 for cutting a bead 2 generated on the inner surface of the welded ERW pipe 1 and the heating efficiency at the time of welding are improved on the inner side of the manufactured ERW pipe. Tool incorporating the impeder core 4 and the impeder case 5 covering the same, a bar serving as a support for the cutting resistance, a so-called mandrel 6
Is inserted.
【０００３】一般に、このマンドレル６には、インピー
ダーコア４の性能を悪化させないように、インピーダー
コア４を冷却するための冷却水配管７が配設されてお
り、インピーダーコア４を連続的に冷却できる構造とな
っている。この冷却水は、溶接点８付近の管内面に位置
するインピーダーケース５の先端部より噴出され、溶接
時に発生するスパッタが前記した治具３に付着しないよ
うにすると同時に、マンドレル６の先端に取り付けてあ
る内面ビード切削用のバイト９をも冷却する役割を果た
している。なお、図４中の１ａはオープンパイプ、１０
はスクイズロールを示す。Generally, the mandrel 6 is provided with a cooling water pipe 7 for cooling the impeder core 4 so that the performance of the impeder core 4 is not deteriorated. It can be cooled down. This cooling water is ejected from the tip of the impeder case 5 located on the inner surface of the pipe near the welding point 8 to prevent spatter generated during welding from adhering to the jig 3 and to the tip of the mandrel 6 at the same time. The attached cutting tool 9 for cutting the inner bead also plays a role of cooling. In addition, 1a in FIG.
Indicates a squeeze roll.
【０００４】しかしながら、ペネトレータに代表される
酸化物欠陥の発生しやすい材料を用いて電縫鋼管を製造
する場合には、前記したような冷却水が溶接点近傍に向
けて噴出するような構造を持つマンドレルを使用する
と、溶接欠陥が多発し、電縫鋼管の品質を大幅に低下さ
せることになる。酸化物欠陥は、材料の加熱溶融時に生
成する酸化物の中で高融点のものがスクイズアウト（排
出）されずに電縫溶接面に残留したもので、大気および
水による高温酸化が主な要因である。そのため、酸化物
欠陥の多発しやすい材料を用いて電縫鋼管を製造する場
合には、アルゴンガスや窒素ガス等の不活性ガスを用い
て溶接部をシールドして溶接する方法が採用されてい
る。However, when an ERW steel pipe is manufactured using a material such as a penetrator, which is liable to generate oxide defects, a structure in which the cooling water is jetted toward the vicinity of the welding point as described above is used. When a mandrel is used, welding defects occur frequently, and the quality of the ERW pipe is greatly reduced. Oxide defects are high-melting oxides generated during heating and melting of materials that remain on the welded surface without being squeezed out, and are mainly caused by high-temperature oxidation by air and water. It is. Therefore, in the case of manufacturing an electric resistance welded steel tube using a material that easily causes oxide defects, a method of shielding and welding a weld portion using an inert gas such as an argon gas or a nitrogen gas has been adopted. .
【０００５】このガスシールド溶接を実施する装置の一
例として、特開昭６３−２７３５７６号のように、シー
ルドボックスを二重管として内筒に多数のガス噴射口を
設け、外筒に設けたガス供給口よりシールドガスを内筒
と外筒の間に供給し、内筒に設けた多数のガス噴出口よ
り噴射するシールドガスによってオープンパイプを被包
するものや、また、特開平２−８９５８１号のように、
シールドボックスの内筒を高周波ワークコイルに内接す
るごとくワークコイルの成形側に配置し、さらに、溶接
点にシールドガスを噴射するガス噴出ノズルを管軸に対
して傾斜配置させることにより、溶接点付近に大気が侵
入するのを防ぎ、パイプ外面側のシールドをより確実と
するもの、が提案されている。[0005] As an example of an apparatus for performing this gas shield welding, as disclosed in Japanese Patent Application Laid-Open No. 63-273576, a shield box is formed as a double tube, a number of gas injection ports are provided in an inner cylinder, and a gas provided in an outer cylinder is provided. A shield gas is supplied from a supply port between an inner cylinder and an outer cylinder, and an open pipe is covered with a shield gas injected from a number of gas outlets provided in the inner cylinder, and JP-A-2-89581. like,
The inner cylinder of the shield box is arranged on the molding side of the work coil as if it is inscribed in the high-frequency work coil, and the gas ejection nozzle that injects the shield gas at the welding point is inclined with respect to the pipe axis, so that it is near the welding point To prevent the intrusion of air into the pipe and to make the shield on the outer surface of the pipe more reliable.
【０００６】しかしながら、前記したようなガスシール
ド溶接装置であっても、使用するマンドレルが、管内面
側の溶接点近傍に向けて冷却水を噴出するものでは、冷
却水の蒸発によって生成する蒸気により、シール性が極
端に悪化するという問題がある。[0006] However, even in the gas shield welding apparatus as described above, if the mandrel used injects cooling water toward the vicinity of the welding point on the inner surface of the pipe, the steam generated by evaporation of the cooling water causes However, there is a problem that the sealing property is extremely deteriorated.
【０００７】これに対処するためには、実開昭５６−１
２９９９４号で提案された、インピーダーコアの冷却水
を管内面側の溶接点近傍に噴出させることなく還流し、
管外へ排出する形式のマンドレルを、前記した特開昭６
３−２７３５７６号や特開平２−８９５８１号で提案さ
れたガスシールド装置と併用して使用すれば、冷却水を
管内面に流出させずに電縫溶接が行えるようになるの
で、シール性を向上させることができると考えられる。In order to deal with this, Japanese Utility Model Application Publication No.
No. 29994, the cooling water of the impeder core was recirculated without jetting near the welding point on the inner surface of the pipe,
The mandrel of the type that discharges outside the pipe is disclosed in
When used in combination with the gas shield device proposed in JP-A-3-273576 and JP-A-2-89581, ERW welding can be performed without allowing cooling water to flow to the inner surface of the pipe, thereby improving the sealing performance. It is thought that it can be done.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、実開昭
５６−１２９９９４号で提案されたような、冷却水を還
流して管外へ排出する形式のマンドレルでは、図５に示
すように、冷却水を還流するための配管（以下、「還流
配管」という）１１が別途必要になるので、その分イン
ピーダ−コアの断面積が小さくなり、溶接効率が低下す
る。このことは、特に、小径サイズの場合に大きな問題
となる。なお、図５中の１２はシールドガスの配管を示
す。However, in a mandrel proposed in Japanese Utility Model Application Laid-Open No. 56-129994 in which cooling water is recirculated and discharged outside the pipe, as shown in FIG. (Hereinafter referred to as "recirculation pipe") 11 is required separately, so that the cross-sectional area of the impedance-core is reduced and welding efficiency is reduced. This is a serious problem especially in the case of a small diameter size. In addition, 12 in FIG. 5 indicates a pipe for shielding gas.
【０００９】また、特開昭６３−２７３５７６号や特開
平２−８９５８１号で提案されたガスシールド溶接装置
にあっては、製造する電縫鋼管の内径が大きくなると、
管内面に供給する不活性ガスの絶対量が不足するので、
管内面側のシール性を向上させることが困難となる。加
えて、溶接点に向けて噴射するシールドガスの噴射方向
は、管の進行方向と同一方向であるので、管内面の流体
の流れが管の進行方向と同一方向になり、パイプオープ
ン部から大気を巻き込み、シール性を悪化させてしま
う。In the gas shield welding apparatus proposed in JP-A-63-273576 and JP-A-2-89581, when the inner diameter of the ERW steel pipe to be manufactured becomes large,
Since the absolute amount of inert gas supplied to the inner surface of the pipe is insufficient,
It becomes difficult to improve the sealing performance on the inner surface side of the pipe. In addition, since the injection direction of the shield gas injected toward the welding point is the same as the direction of travel of the pipe, the flow of the fluid on the inner surface of the pipe is the same as the direction of travel of the pipe, and the air flows from the pipe open section to the atmosphere. And the sealing property is deteriorated.
【００１０】すなわち、上記した特開昭６３−２７３５
７６号や特開平２−８９５８１号で提案されたガスシー
ルド溶接装置に、実開昭５６−１２９９９４号で提案さ
れたマンドレルを併用して使用したとしても、下記の理
由により、電縫鋼管の品質は良くならない。 大径の電縫鋼管の製造時には、大気の巻き込みやシ
ールドガスの不足で電縫溶接部に有害な酸化物が生じ、
品質を悪化させる。 還流配管が必要であるから、溶接効率を向上させる
ためのインピーダーコアの断面積が小さくなり、特に小
径の電縫鋼管の製造時には、溶接効率が低下する。 冷却水がマンドレルから漏れた場合、管内面に冷却
水が存在することになるので、電縫溶接部に有害な酸化
物を生じる要因となり、工具の交換が必要となる。That is, the above-mentioned JP-A-63-2735 is disclosed.
No. 76 and the gas shield welding apparatus proposed in Japanese Patent Application Laid-Open No. 2-89581, the mandrel proposed in Japanese Utility Model Application Laid-Open No. 56-129994 is used, but the quality of the ERW steel pipe is reduced due to the following reasons. Does not get better. During the production of large-diameter ERW steel pipes, harmful oxides are generated in the ERW weld due to entrainment in the atmosphere and lack of shielding gas.
Deteriorate quality. Since a reflux pipe is required, the cross-sectional area of the impeder core for improving the welding efficiency is reduced, and the welding efficiency is reduced particularly when a small-diameter ERW steel pipe is manufactured. If the cooling water leaks from the mandrel, the cooling water will be present on the inner surface of the pipe, causing harmful oxides to be generated in the electric resistance welded portion, and the tool needs to be replaced.
【００１１】本発明は、上記した従来の問題点に鑑みて
なされたものであり、小径の電縫鋼管を製造する場合に
も溶接効率が低下せず、また、管内面をシールド雰囲気
にしにくい大径の電縫鋼管を製造する場合にも、シール
ド性を確保し、かつ、生産性を悪化させずに、シールド
溶接できる電縫鋼管のガスシールド溶接装置を提供する
ことを目的としている。The present invention has been made in view of the above-mentioned conventional problems. Even when a small-diameter electric resistance welded steel pipe is manufactured, the welding efficiency is not reduced, and the inner surface of the pipe is difficult to be shielded. It is an object of the present invention to provide a gas shielded welding apparatus for an ERW steel pipe that can perform shield welding without losing productivity even when manufacturing an ERW steel pipe having a diameter.
【００１２】[0012]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の電縫鋼管のガスシールド溶接装置は、
オープンパイプ内に挿入されるインピーダーケースの後
端側に液化ガス配管を連結すると共に、インピーダーケ
ースの先端側における溶接点と対向する部分に液化ガス
の噴出孔を設けることとしている。そして、このような
液化ガス配管を介して供給された液化ガスにより、イン
ピーダーコアが冷却され、冷却後の液化ガスはインピー
ダーケースから溶接点に向けて噴出して溶接部をガスシ
ールすると共に、バイトを冷却する。In order to achieve the above object, a gas shield welding apparatus for an electric resistance welded steel pipe according to the present invention is provided.
A liquefied gas pipe is connected to the rear end side of the impeder case inserted into the open pipe, and a liquefied gas ejection hole is provided in a portion of the front end side of the impeder case facing the welding point. Then, the liquefied gas supplied through such a liquefied gas pipe cools the impeder core, and the liquefied gas after cooling is ejected from the impeder case toward the welding point to gas seal the welded portion. Cool the bite.
【００１３】[0013]
【発明の実施の形態】第１の本発明の電縫鋼管のガスシ
ールド溶接装置は、不活性ガスシールド雰囲気下におい
て誘導加熱によりオープンパイプのエッジ部を加熱し、
直ちにスクイズロールで加圧・接合する電縫鋼管のガス
シールド溶接装置において、オープンパイプ内に挿入さ
れるインピーダーケースの後端側に液化ガス配管を連結
すると共に、インピーダーケースの先端側における溶接
点と対向する部分に液化ガスの噴出孔を設け、液化ガス
配管を介してインピーダーケース内に供給された液化ガ
スがインピーダーコアを冷却した後溶接点に向けて噴出
し、溶接部をガスシールすると共にバイトを冷却するよ
うにしたものである。BEST MODE FOR CARRYING OUT THE INVENTION A gas shield welding apparatus for an electric resistance welded steel pipe according to the first invention heats the edge of an open pipe by induction heating under an inert gas shield atmosphere.
In a gas shielded welding machine for ERW steel pipes that are immediately pressed and joined with squeeze rolls, a liquefied gas pipe is connected to the rear end of the impeder case inserted into the open pipe, and welding is performed at the tip of the impeder case. A liquefied gas ejection hole is provided at the part opposite to the point, and the liquefied gas supplied into the impeder case through the liquefied gas pipe cools the impeder core and then ejects toward the welding point, and the welded part is gasified. It is designed to seal and cool the cutting tool .
【００１４】また、第２の本発明の電縫鋼管のガスシー
ルド溶接装置は、前記した第１の本発明の電縫鋼管のガ
スシールド溶接装置に加えて、管内に挿入するマンドレ
ル内に、管の進行方向と逆向きのガス噴出口を設けた非
磁性のシールドガス配管を設けると共に、前記マンドレ
ルあるいはインピーダーケースに、管内からのガスの流
出を防止する非磁性のパッキンを設置したものである。Further, gas shielded welding apparatus electric sewing steel pipe of the second aspect of the present invention, in addition to the gas-shielded welding apparatus electric sewing steel pipe according to the first aspect of the present invention described above, in the mandrel to be inserted into the tube, the tube And a non-magnetic shield gas pipe provided with a gas ejection port in a direction opposite to the traveling direction of the pipe, and a non-magnetic packing for preventing gas from flowing out of the pipe is installed in the mandrel or the impeder case. .
【００１５】また、第３の本発明の電縫鋼管のガスシー
ルド溶接装置は、前記した第１，第２の本発明の電縫鋼
管のガスシールド溶接装置に加えて、オープンパイプの
外径より大きい内径を有し、かつ、多数のガス噴出口を
有する内筒と、複数個のガス供給口を有し高周波ワーク
コイルに内接する外筒とからなり、内筒と外筒との間に
シールドガスを通流する構造となした二重管で溶接点近
傍の外周面用シールドボックスを構成し、該シールドボ
ックスはオープンパイプを同心円上に囲繞するごとく溶
接点後方に近接配置し、請求項１又は２記載の電縫鋼管
のガスシールド溶接装置と協動して溶接部の内外面をシ
ールドするようにしたものである。Further, a third gas shielded welding apparatus electric sewing steel pipe of the present invention, first mentioned above, in addition to the gas-shielded welding apparatus electric sewing steel pipe according to the second embodiment of the invention, than the outer diameter of the open pipe An inner cylinder having a large inner diameter and having a large number of gas ejection ports, and an outer cylinder having a plurality of gas supply ports and inscribed in a high-frequency work coil, and a shield is provided between the inner cylinder and the outer cylinder. Near the welding point with a double pipe with a structure that allows gas to flow
An electric resistance welded steel pipe according to claim 1 or 2 , wherein a shield box for an outer peripheral surface is formed, and the shield box is disposed close to the rear of the welding point so as to surround the open pipe on a concentric circle.
Seals the inner and outer surfaces of the weld in cooperation with the
That is,
【００１６】上記した第１の本発明の電縫鋼管のガスシ
ールド溶接装置は、特に小径管の製造に適したものであ
り、液化ガス配管を介してインピーダーケース内に供給
された液化ガスにより、インピーダーコアを冷却する。
冷却後の液化ガスは溶接点に向けて噴出して溶接部をガ
スシールすると共に、バイトを冷却する。従って、酸化
物欠陥の多発しやすい材料を用いて電縫鋼管を製造する
場合に、従来のガスシールド溶接装置に必要不可欠であ
った冷却水の還流配管が不要となるので、インピーダー
コアの断面積を大きくでき、溶接効率が向上する。The above-described gas shielded welding apparatus for an electric resistance welded steel pipe according to the first aspect of the present invention is particularly suitable for manufacturing a small-diameter pipe, and uses a liquefied gas supplied to an impeder case through a liquefied gas pipe. Cool the impeder core.
The cooled liquefied gas is jetted toward the welding point to gas seal the weld and cool the bite. Therefore, when manufacturing an ERW steel pipe using a material that is likely to cause oxide defects, a cooling water reflux pipe, which is indispensable for a conventional gas shield welding device, is not required, and the impeder core is cut off. The area can be enlarged, and the welding efficiency is improved.
【００１７】しかし、大径管の製造に際しては、冷却後
溶接点に向けて噴出する液化ガスだけでは、溶接部のシ
ールドが不十分となる場合があるので、マンドレルある
いはインピーダーケースに、管内からのガスの流出を防
止する非磁性のパッキンを設置すると共に、マンドレル
に設けた非磁性のシールドガス配管を介して管内に更に
シールドガスを供給する。この時、シールドガスは、管
の進行方向と逆向きに噴出されるので、溶接部に大気を
巻き込むことがない。また、パッキンによって管からの
シールドガスの流出が防止できるので、シールドガスの
不足で電縫溶接部に有害な酸化物が生じることもない。However, when manufacturing a large-diameter pipe, the liquefied gas spouted toward the welding point after cooling may not be enough to shield the welded portion. In addition to installing a non-magnetic packing for preventing the gas from flowing out, the shield gas is further supplied into the pipe via a non-magnetic shield gas pipe provided on the mandrel. At this time, the shield gas is ejected in a direction opposite to the traveling direction of the pipe, so that the atmosphere does not get into the weld. In addition, since the gas can be prevented from leaking out of the pipe by the packing, no harmful oxide is generated in the ERW weld due to a shortage of the shielding gas.
【００１８】第２の本発明の電縫鋼管のガスシールド溶
接装置において、マンドレルに設けたシールドガス配管
やパッキンを非磁性としたのは、シールドガス配管やパ
ッキンへの誘導電流の流れによる電力ロスを防止するた
めである。シールドガス配管に使用する非磁性材料とし
ては、例えば耐熱性エポキシ樹脂、ジアリルフタレート
樹脂、フェノール樹脂、不飽和ポリエステル樹脂、フラ
ン樹脂、ポリイミド樹脂、メラミン樹脂、ユリア樹脂等
の耐熱性樹脂が適している。また、パッキンに使用する
非磁性材料としては、耐熱性ゴムが適している。In the gas shielded welding apparatus for an electric resistance welded steel pipe according to the second aspect of the present invention, the shield gas pipe and the packing provided on the mandrel are made non-magnetic because the power loss due to the flow of the induced current to the shield gas pipe and the packing. This is to prevent As the non-magnetic material used for the shielding gas pipe, for example, a heat-resistant resin such as a heat-resistant epoxy resin, a diallyl phthalate resin, a phenol resin, an unsaturated polyester resin, a furan resin, a polyimide resin, a melamine resin, and a urea resin is suitable. . Heat-resistant rubber is suitable as the non-magnetic material used for the packing.
【００１９】また、前記した第２の本発明の電縫鋼管の
ガスシールド溶接装置に代えてすなわち第１の本発明の
電縫鋼管のガスシールド溶接装置に加えて、あるいは、
第２の本発明の電縫鋼管のガスシールド溶接装置に加え
て、さらに、オープンパイプの外径より大きい内径を有
し、かつ、多数のガス噴出口を有する内筒と、複数個の
ガス供給口を有し高周波ワークコイルに内接する外筒と
からなり、内筒と外筒との間にシールドガスを通流する
構造となした二重管で溶接点近傍の外周面用シールドボ
ックスを構成し、該シールドボックスはオープンパイプ
を同心円上に囲繞するごとく溶接点後方に近接配置し、
第１又は第２の本発明の電縫鋼管のガスシールド溶接装
置と協動して溶接部の内外面をシールドするようにした
ものでもよい。Further, in place of the gas shield welding apparatus for an electric resistance welded steel pipe according to the second aspect of the present invention, that is, according to the first aspect of the present invention,
In addition to gas shielded welding equipment for ERW steel pipes , or
In addition to the gas shielded welding apparatus for an electric resistance welded steel pipe according to the second invention, an inner cylinder having an inner diameter larger than the outer diameter of the open pipe and having a large number of gas ejection ports, and a plurality of gas supply ports The outer tube near the welding point is composed of a double tube that has an opening and has an outer cylinder inscribed in the high-frequency work coil, and a structure that allows the shielding gas to flow between the inner cylinder and the outer cylinder. The shield box is arranged close to the rear of the welding point so as to surround the open pipe concentrically ,
Gas shield welding equipment for ERW steel pipe of the first or second invention
The inner and outer surfaces of the welded portion may be shielded in cooperation with the mounting .
【００２０】[0020]
【実施例】以下、本発明に係る電縫鋼管のガスシールド
溶接装置を図１〜図３に示す一実施例に基づいて説明す
る。図１は第１の本発明に係る電縫鋼管のガスシールド
溶接装置の一実施例を示す概略構成図、図２は第２の本
発明に係る電縫鋼管のガスシールド溶接装置の一実施例
を示す概略構成図、図３は第３の本発明に係る電縫鋼管
のガスシールド溶接装置の一実施例を示す概略構成図で
ある。なお、図１〜図３中において、図４及び図５と同
一符号は同一部分あるいは相当部分を示し、詳細な説明
を省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas shield welding apparatus for an electric resistance welded steel pipe according to the present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a schematic diagram showing an embodiment of a gas shield welding apparatus for an electric resistance welded steel pipe according to the first invention, and FIG. 2 is an embodiment of a gas shield welding apparatus for an electric resistance welded steel pipe according to the second invention. FIG. 3 is a schematic configuration diagram showing one embodiment of a gas shield welding apparatus for an electric resistance welded steel pipe according to the third invention. 1 to 3, the same reference numerals as those in FIGS. 4 and 5 indicate the same or corresponding portions, and a detailed description thereof will be omitted.
【００２１】図１において、２１はインピーダーケース
５の後端側に連結した、例えば液化窒素ガス等の液化ガ
ス配管であり、この液化ガス配管２１を介してインピー
ダーケース５内に例えば液化窒素ガスを供給し、従来の
冷却水に代わってインピーダーケース５内のインピーダ
ーコア（図示省略）を冷却する。In FIG. 1, reference numeral 21 denotes a liquefied gas pipe connected to the rear end side of the impeder case 5 such as a liquefied nitrogen gas or the like. The gas is supplied to cool the impeder core (not shown) in the impeder case 5 in place of the conventional cooling water.
【００２２】そして、インピーダーコアを冷却した後の
液化窒素ガスは、インピーダーケース５の先端側におけ
る溶接点と対向する部分に設けた噴出孔２２より溶接点
８に向かって噴出し、溶接部をガスシールすると共に、
バイト９を冷却する。The liquefied nitrogen gas after cooling the impeder core is ejected toward the welding point 8 from an ejection hole 22 provided at a portion of the tip end side of the impeder case 5 opposite to the welding point. Gas seal,
The cutting tool 9 is cooled.
【００２３】第１の本発明に係る電縫鋼管のガスシール
ド溶接装置は上記したような構成であり、例えば小径の
電縫鋼管の製造時には、液化ガス配管２１を介してイン
ピーダーケース５内に液化窒素ガスを供給するのであ
る。この液化窒素ガスはインピーダーコアを冷却した
後、噴出孔２２より溶接点８に向けて噴出し、溶接部を
ガスシールすると共に、バイト９を冷却する。The gas shielded welding apparatus for an electric resistance welded steel pipe according to the first aspect of the present invention is configured as described above. For example, when a small diameter electric resistance welded steel pipe is manufactured, the gas shielded welding apparatus is inserted into the impeder case 5 through a liquefied gas pipe 21. It supplies liquefied nitrogen gas. After cooling the impeder core, the liquefied nitrogen gas is ejected from the ejection hole 22 toward the welding point 8 to gas seal the welded portion and cool the cutting tool 9.
【００２４】このように、第１の本発明に係る電縫鋼管
のガスシールド溶接装置によれば、酸化物欠陥の多発し
やすい材料を用いて電縫鋼管を製造する場合に、従来の
ガスシールド溶接装置に必要不可欠であった冷却水の還
流配管が不要となるので、インピーダーコアの断面積を
大きくでき、溶接効率を向上することができる。As described above, according to the gas shielded welding apparatus for an electric resistance welded steel pipe according to the first aspect of the present invention, when the electric resistance welded steel pipe is manufactured using a material in which oxide defects are likely to occur, the conventional gas shielded pipe is used. Since the cooling water return pipe, which is indispensable for the welding device, is not required, the cross-sectional area of the impeder core can be increased, and the welding efficiency can be improved.
【００２５】図２において、２３は管内に挿入するマン
ドレル６内に設けた例えば耐熱性エポキシ樹脂製のシー
ルドガス配管であり、溶接点よりも上流側の位置におい
て、管の進行方向と逆向きにガス噴出口２３ａを設けて
いる。２４は例えばマンドレル６に外嵌状に設置され、
マンドレル６とオープンパイプ１ａとで形成された環状
空間２５を密閉する、例えばゴム製のパッキンである。In FIG. 2, reference numeral 23 denotes a shield gas pipe made of, for example, a heat-resistant epoxy resin provided in the mandrel 6 to be inserted into the pipe. A gas outlet 23a is provided. For example, 24 is installed on the mandrel 6 so as to be fitted outside,
For example, rubber packing is used to seal the annular space 25 formed by the mandrel 6 and the open pipe 1a.
【００２６】第２の本発明に係る電縫鋼管のガスシール
ド溶接装置は上記したような構成であり、例えば大径の
電縫鋼管の製造時には、前記第１の本発明に係る電縫鋼
管のガスシールド溶接装置と同様に、液化ガス配管２１
を介してインピーダーケース５内に液化窒素ガスを供給
し、インピーダーコアを冷却すると共に、冷却後の液化
窒素ガスは噴出孔２２より溶接点に向けて噴出し、溶接
部のガスシールとバイト９の冷却を行う。The gas shield welding apparatus for an electric resistance welded steel pipe according to the second aspect of the present invention is configured as described above. For example, when manufacturing a large-diameter electric resistance welded steel pipe, the electric resistance welded steel pipe according to the first aspect of the present invention is used. As with the gas shield welding device, the liquefied gas pipe 21
Liquefied nitrogen gas is supplied to the inside of the impeder case 5 through the through hole to cool the impeder core, and the cooled liquefied nitrogen gas is ejected from the ejection hole 22 toward the welding point, and the gas seal and the bite at the welded portion 9 is cooled.
【００２７】しかしながら、大径鋼管の製造時にあって
は、ガスシールすべき面積が大きく、冷却後の前記液化
窒素ガスだけでは、溶接部を完全にシールすることがで
きない。そこで、前記液化窒素ガスの供給と共に、パッ
キン２４によって密閉されたマンドレル６とオープンパ
イプ１ａとで形成された環状空間２５に、ガス噴出口２
３ａからシールドガスを供給する。このシールドガスの
噴射方向は、管の進行方向と逆向きであるので、管内面
の流体の流れが管の進行方向と逆方向となり、パイプオ
ープン部からの大気の巻き込みが防止される。However, when manufacturing a large-diameter steel pipe, the area to be gas-sealed is large, and the liquefied nitrogen gas after cooling alone cannot completely seal the welded portion. Therefore, along with the supply of the liquefied nitrogen gas, the gas outlet 2 is inserted into an annular space 25 formed by the mandrel 6 sealed by the packing 24 and the open pipe 1a.
The shield gas is supplied from 3a. Since the direction of injection of the shield gas is opposite to the direction of travel of the pipe, the flow of fluid on the inner surface of the pipe is opposite to the direction of travel of the pipe, thereby preventing entrainment of air from the pipe open portion.
【００２８】次に、本発明に係る電縫鋼管のガスシール
ド溶接装置の効果を確認するために行った実験の結果に
ついて説明する。重量％で、Ｃ：０．３０％、Si：０．
２５％、Mn：０．５５％、Cr：１．０％、Mo：０．２０
％を含む、外径３４．０ｍｍ、肉厚１．６ｍｍの電縫鋼
管を１０本、図１に示す本発明に係る電縫鋼管のガスシ
ールド溶接装置を用いて製造したところ、ペネトレータ
ーは全く発生しなかった。なお、この製造に際しては、
液化ガス配管から液化窒素ガスを０．３Nm3/min 供給し
た。Next, the results of an experiment conducted to confirm the effect of the gas shielded welding device for an electric resistance welded steel pipe according to the present invention will be described. By weight%, C: 0.30%, Si: 0.
25%, Mn: 0.55%, Cr: 1.0%, Mo: 0.20
% Of the ERW steel pipes having an outer diameter of 34.0 mm and a wall thickness of 1.6 mm containing 10%, and using the gas-shielded welding apparatus for ERW steel pipes according to the present invention shown in FIG. 1, no penetrator was generated. Did not. In this production,
Liquefied nitrogen gas was supplied at 0.3 Nm 3 / min from a liquefied gas pipe.
【００２９】また、前記と同じ材質で、外径１０１．６
ｍｍ、肉厚４．０ｍｍの電縫鋼管を１０本、図２に示す
本発明に係る電縫鋼管のガスシールド溶接装置を用いて
製造した場合も、ペネトレーターは全く発生しなかっ
た。なお、この製造に際しては、液化ガス配管から液化
窒素ガスを０．３Nm3/min 供給し、また、シールドガス
配管からＮ2 ガスを１．１Nm3/min 、１kgf/cm2 の圧力
で供給した。The same material as described above, having an outer diameter of 101.6
Even when ten ERW steel pipes having a thickness of 4.0 mm and a thickness of 4.0 mm were manufactured using the gas-shielded welding apparatus for ERW steel pipes according to the present invention shown in FIG. 2, no penetrator was generated. In this production, liquefied nitrogen gas was supplied at 0.3 Nm 3 / min from the liquefied gas pipe, and N 2 gas was supplied at 1.1 Nm 3 / min at a pressure of 1 kgf / cm 2 from the shield gas pipe. .
【００３０】上記した実施例では、パッキン２４をマン
ドレル６に設けたものを示したが、インピーダーケース
５に設けても良いことは勿論である。また、シールドガ
ス配管２３やパッキン２４も実施例で示した材料に限る
ものではなく、発明の実施の形態で示したものを採用し
ても良い。また、製造する電縫鋼管が大径の場合、図２
に示した本発明に係る電縫鋼管のガスシールド溶接装置
に、さらに、図３に示すような、オープンパイプ１ａの
外径より大きい内径を有し、かつ、多数のガス噴出口３
１ａを有する内筒３１と、複数個のガス供給口３２ａを
有し高周波ワークコイル３３に内接する外筒３２とから
なり、内筒３１と外筒３２との間にシールドガスを通流
する構造となした二重管で溶接点８近傍の外周面用シー
ルドボックス３４を構成し、該シールドボックス３４は
オープンパイプ１ａを同心円上に囲繞するごとく溶接点
８の後方に近接配置したガスシールを併用し、第１又は
第２の本発明の電縫鋼管のガスシールド溶接装置と協動
して溶接部の内外面をシールドするようにしたものでも
よい。これが第３の本発明に係る電縫鋼管のガスシール
ド溶接装置である。In the above-described embodiment, the packing 24 is provided on the mandrel 6, but it is needless to say that the packing 24 may be provided on the impeder case 5. Further, the shielding gas pipe 23 and the packing 24 are not limited to the materials described in the embodiments, but may be the ones described in the embodiments of the invention. When the ERW steel pipe to be manufactured has a large diameter, FIG.
The gas shielded welding apparatus for an electric resistance welded steel pipe according to the present invention shown in FIG. 3 further has an inner diameter larger than the outer diameter of the open pipe 1a and a large number of gas ejection ports 3 as shown in FIG.
1a and an outer cylinder 32 having a plurality of gas supply ports 32a and being inscribed in the high-frequency work coil 33. A structure in which a shield gas flows between the inner cylinder 31 and the outer cylinder 32. An outer peripheral shield box 34 in the vicinity of the welding point 8 is constituted by the double pipe thus formed, and the shield box 34 is arranged close to the rear of the welding point 8 so as to surround the open pipe 1a concentrically. The first or the combined gas seal
Cooperates with the second invention gas shielded welding equipment for ERW steel pipes
Alternatively, the inner and outer surfaces of the welded portion may be shielded . This is the third embodiment of the gas shielded welding apparatus for an electric resistance welded steel pipe according to the present invention.
【００３１】[0031]
【発明の効果】以上説明したように、本発明の電縫鋼管
のガスシールド溶接装置によれば、酸化物欠陥の多発し
やすい材料を用いて電縫鋼管を製造する場合に、溶接部
のガスシールと共にバイトをも冷却でき、かつ、従来の
ガスシールド溶接装置に必要不可欠であった冷却水の還
流配管が不要となるので、インピーダーコアの断面積を
大きくでき、溶接効率が向上する。加えて、マンドレル
あるいはインピーダーケースに、管内からのガスの流出
を防止する非磁性のパッキンを設置すると共に、マンド
レルに設けた非磁性の配管から管の進行方向と逆向きに
管内にシールドガスを供給したり、また、オープンパイ
プの外径より大きい内径を有し、かつ、多数のガス噴出
口を有する内筒と、複数個のガス供給口を有し高周波ワ
ークコイルに内接する外筒とからなり、内筒と外筒との
間にシールドガスを通流する構造となした二重管で溶接
点近傍の外周面用シールドボックスを構成し、該シール
ドボックスはオープンパイプを同心円上に囲繞するごと
く溶接点後方に近接配置し、前記の本発明の電縫鋼管の
ガスシールド溶接装置と協動して溶接部の内外面をシー
ルドするようにしたりすれば、電力のロスを防止しつ
つ、また、溶接部に大気を巻き込むこともなく、さら
に、シールドガスの不足で電縫溶接部に有害な酸化物が
生じることもない。As described above, according to the gas-shielded welding apparatus for ERW steel pipes of the present invention, when manufacturing ERW steel pipes using a material in which oxide defects are likely to occur, a welded portion is produced.
Since the cutting tool can be cooled together with the gas seal, and the cooling water return pipe, which is indispensable for the conventional gas shield welding equipment, is no longer necessary, the cross-sectional area of the impeder core can be increased, and welding efficiency can be improved. . In addition, a non-magnetic packing is installed in the mandrel or impeder case to prevent gas from flowing out of the pipe, and shielding gas is injected into the pipe from the non-magnetic pipe provided on the mandrel in the direction opposite to the direction of travel of the pipe. Or an inner cylinder having an inner diameter larger than the outer diameter of the open pipe, and having a number of gas outlets, and an outer cylinder having a plurality of gas supply ports and inscribed in the high-frequency work coil. Welded with a double pipe that has a structure that allows shielding gas to flow between the inner and outer cylinders
A shield box for the outer peripheral surface near the point is formed, and the shield box is arranged close to the rear of the welding point so as to surround the open pipe on a concentric circle .
The inner and outer surfaces of the weld are sealed in cooperation with the gas shield welding equipment.
This prevents the loss of electric power, prevents air from getting into the weld, and prevents harmful oxides from being generated in the ERW weld due to insufficient shielding gas.
【図１】第１の本発明に係る電縫鋼管のガスシールド溶
接装置の一実施例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing one embodiment of a gas shield welding apparatus for an electric resistance welded steel pipe according to the first invention.
【図２】第２の本発明に係る電縫鋼管のガスシールド溶
接装置の一実施例を示す概略構成図である。FIG. 2 is a schematic configuration diagram showing one embodiment of a gas shielded welding apparatus for an electric resistance welded steel pipe according to the second invention.
【図３】第３の本発明に係る電縫鋼管のガスシールド溶
接装置の一実施例を示す概略構成図である。FIG. 3 is a schematic configuration diagram showing one embodiment of a gas shield welding apparatus for an electric resistance welded steel pipe according to a third invention.
【図４】従来の電縫鋼管のガスシールド溶接装置を縦断
面して示す説明図である。FIG. 4 is an explanatory view showing a longitudinal section of a conventional gas shielded welding device for ERW steel pipes.
【図５】実開昭５６−１２９９９４号で提案されたよう
な冷却水を還流して管外へ排出する形式のマンドレルを
使用した電縫鋼管のガスシールド溶接装置の概略構成図
である。FIG. 5 is a schematic configuration diagram of a gas shield welding apparatus for an electric resistance welded steel pipe using a mandrel of a type that refluxes cooling water and discharges it outside the pipe as proposed in Japanese Utility Model Application Laid-Open No. 56-129994.
１ 電縫鋼管 １ａ オープンパイプ ５ インピーダーケース ６ マンドレル １０ スクイズロール ２１ 液化ガス配管 ２２ 噴出孔 ２３ シールドガス配管 ２３ａ ガス噴出口 ２４ パッキン ３１ 内筒 ３１ａ ガス噴出口 ３２ 外筒 ３２ａ ガス供給口 ３３ 高周波ワークコイル ３４ シールドボックス DESCRIPTION OF SYMBOLS 1 ERW steel pipe 1a Open pipe 5 Impeder case 6 Mandrel 10 Squeeze roll 21 Liquefied gas pipe 22 Injection hole 23 Shield gas pipe 23a Gas spout 24 Packing 31 Inner cylinder 31a Gas spout 32 Outer cylinder 32a Gas supply port 33 High frequency work Coil 34 shield box
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ // Ｂ２３Ｋ 9/16 Ｂ２３Ｋ 9/16 Ｌ (56)参考文献 特開 平１−178380（ＪＰ，Ａ) 特開 平３−248782（ＪＰ，Ａ) 特開 平７−275930（ＪＰ，Ａ) 特開 平２−241676（ＪＰ，Ａ) 特開 平８−52576（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/16 B23K 13/00 B23K 13/06 B23K 13/08 B23K 37/00 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 Identification symbol FI // B23K 9/16 B23K 9/16 L (56) References JP-A-1-178380 (JP, A) JP-A-3-3 248782 (JP, A) JP-A-7-275930 (JP, A) JP-A-2-241676 (JP, A) JP-A 8-52576 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B23K 9/16 B23K 13/00 B23K 13/06 B23K 13/08 B23K 37/00
Claims (3)
導加熱によりオープンパイプのエッジ部を加熱し、直ち
にスクイズロールで加圧・接合する電縫鋼管のガスシー
ルド溶接装置において、オープンパイプ内に挿入される
インピーダーケースの後端側に液化ガス配管を連結する
と共に、インピーダーケースの先端側における溶接点と
対向する部分に液化ガスの噴出孔を設け、液化ガス配管
を介してインピーダーケース内に供給された液化ガスが
インピーダーコアを冷却した後溶接点に向けて噴出し、
溶接部をガスシールすると共にバイトを冷却するように
したことを特徴とする電縫鋼管のガスシールド溶接装
置。1. An electric resistance welded steel pipe gas shield welding apparatus in which an edge of an open pipe is heated by induction heating in an inert gas shield atmosphere and immediately pressurized and joined with a squeeze roll, and inserted into the open pipe. A liquefied gas pipe is connected to the rear end side of the impeder case, and a liquefied gas ejection hole is provided at a portion facing the welding point on the tip side of the impeder case, and the liquefied gas is supplied into the impeder case via the liquefied gas pipe. After the cooled liquefied gas cools the impeder core, it blows out toward the welding point,
A gas shield welding apparatus for an electric resistance welded steel pipe, wherein a welding portion is gas-sealed and a cutting tool is cooled .
溶接装置に加えて、管内に挿入するマンドレル内に、管
の進行方向と逆向きのガス噴出口を設けた非磁性のシー
ルドガス配管を設けると共に、前記マンドレルあるいは
インピーダーケースに、管内からのガスの流出を防止す
る非磁性のパッキンを設置したことを特徴とする電縫鋼
管のガスシールド溶接装置。2. A gas shield for an electric resistance welded steel pipe according to claim 1.
In addition to the welding device, a non-magnetic shield gas pipe provided with a gas ejection port in the direction opposite to the traveling direction of the pipe is provided in a mandrel inserted into the pipe, and gas from the pipe is provided in the mandrel or impeder case. gas shielded welding device to that conductive sewing steel, characterized in that established a non-magnetic gasket to prevent leakage of the.
ールド溶接装置に加えて、オープンパイプの外径より大
きい内径を有し、かつ、多数のガス噴出口を有する内筒
と、複数個のガス供給口を有し高周波ワークコイルに内
接する外筒とからなり、内筒と外筒との間にシールドガ
スを通流する構造となした二重管で溶接点近傍の外周面
用シールドボックスを構成し、該シールドボックスはオ
ープンパイプを同心円上に囲繞するごとく溶接点後方に
近接配置し、請求項１又は２記載の電縫鋼管のガスシー
ルド溶接装置と協動して溶接部の内外面をシールドする
ようにしたことを特徴とする電縫鋼管のガスシールド溶
接装置。3. The gas seal of an electric resistance welded steel pipe according to claim 1 or 2.
In addition to the cold welding equipment, an inner cylinder having an inner diameter larger than the outer diameter of the open pipe, and having a number of gas outlets, and an outer cylinder having a plurality of gas supply ports and inscribed in the high-frequency work coil. The outer surface near the welding point is a double pipe with a structure that allows the shielding gas to flow between the inner cylinder and the outer cylinder.
The shielded box for an electric resistance welded steel pipe according to claim 1 or 2 , wherein the shield box is arranged close to the rear of the welding point so as to surround the open pipe concentrically.
Shields the inner and outer surfaces of the weld in cooperation with the field welding equipment
Gas shielded welding apparatus that electric sewing steel pipe to, characterized in that as.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05898597A JP3327514B2 (en) | 1997-03-13 | 1997-03-13 | Gas shield welding equipment for ERW steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05898597A JP3327514B2 (en) | 1997-03-13 | 1997-03-13 | Gas shield welding equipment for ERW steel pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10249547A JPH10249547A (en) | 1998-09-22 |
| JP3327514B2 true JP3327514B2 (en) | 2002-09-24 |
Family
ID=13100151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05898597A Expired - Fee Related JP3327514B2 (en) | 1997-03-13 | 1997-03-13 | Gas shield welding equipment for ERW steel pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3327514B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1294529B8 (en) * | 2000-06-27 | 2005-08-03 | Westfalen Ag | Method and device for limiting temperature using gas, when welding the ends of two tubes, in the region of the tube material close to the weld seam |
| DE102005014833A1 (en) * | 2005-03-30 | 2006-10-05 | Westfalen Ag | Process for welding metals |
| JP2006272423A (en) * | 2005-03-30 | 2006-10-12 | Nisshin Steel Co Ltd | Method of producing high-frequency induction heating tube for steel tube |
| JP4632428B2 (en) * | 2005-04-11 | 2011-02-16 | 日新製鋼株式会社 | High frequency induction heating pipe making method of steel pipe |
| JP2013169579A (en) * | 2012-02-22 | 2013-09-02 | Nisshin Steel Co Ltd | Seal box welding equipment of electric resistance welded tube |
| JP6058410B2 (en) * | 2013-01-31 | 2017-01-11 | Ｊｆｅ建材株式会社 | Welding smoother for inner surface of welded steel pipe |
| JP6103758B2 (en) * | 2013-03-28 | 2017-03-29 | 日新製鋼株式会社 | Welding method of ERW steel pipe using seal box |
| CN105014267B (en) * | 2015-07-13 | 2016-09-28 | 天津钢管集团股份有限公司 | Water curtain argon comprehensive welding protection device in high-frequency straight seam welded pipe pipe |
-
1997
- 1997-03-13 JP JP05898597A patent/JP3327514B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10249547A (en) | 1998-09-22 |
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