JPS6393424A - Manufacture of thin electric welded pipe - Google Patents
Manufacture of thin electric welded pipeInfo
- Publication number
- JPS6393424A JPS6393424A JP23708286A JP23708286A JPS6393424A JP S6393424 A JPS6393424 A JP S6393424A JP 23708286 A JP23708286 A JP 23708286A JP 23708286 A JP23708286 A JP 23708286A JP S6393424 A JPS6393424 A JP S6393424A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- weld bead
- welding bead
- sizing
- base metal
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011324 bead Substances 0.000 claims abstract description 59
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000004513 sizing Methods 0.000 claims abstract description 11
- 238000007493 shaping process Methods 0.000 claims abstract description 9
- 238000009751 slip forming Methods 0.000 claims 1
- 239000010953 base metal Substances 0.000 abstract description 15
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 238000005452 bending Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 10
- 239000000523 sample Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000013068 control sample Substances 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000009661 fatigue test Methods 0.000 description 4
- 238000012217 deletion Methods 0.000 description 3
- 230000037430 deletion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 本発明は、薄肉電縫管の製造法に関する。[Detailed description of the invention] The present invention relates to a method for manufacturing a thin-walled electric resistance welded tube.
電縫管は、帯板を連続的にフォーミング・ロールによっ
て略円弧状に成形し、得られたスケルプの両エツジをス
クイズ・ロールで電気抵抗溶接により接合し、溶接後管
体の外面および内面に突出した溶接ビードを削除し、そ
して管体をサイジング・ロールで真円状に成形すること
によって製造される。この場合、内面側溶接ビードは、
削除されないこともあるが、外面側溶接ビードは、管の
真円度を精度よく保つべく、必ず削除されている。ERW pipes are made by continuously forming strips into a roughly circular arc shape using forming rolls, joining both edges of the resulting skelp using electric resistance welding using squeeze rolls, and after welding, the outer and inner surfaces of the pipe body are It is manufactured by removing the protruding weld bead and forming the tube into a perfect circle with sizing rolls. In this case, the inner weld bead is
Although sometimes not removed, the outer weld bead is always removed in order to maintain accurate roundness of the tube.
外面側溶接ビードの削除は、スクイズ・ロールでの溶接
後直ちに切削工具により行われる。Removal of the outer weld bead is performed with a cutting tool immediately after welding with the squeeze roll.
−ｍに、スケルプ・エツジの成形は不充分になりやすく
、スクイズ・ロールに入る直前のスケルプ・エツジ付近
の曲率半径は、管半径の呼び寸法よりも大きいのがＹ＆
通であり、溶接部は管の仮想外周円よりも外側にやや突
出する傾向にある。そのため、第３図に示す如く、外面
側溶接ビード１に隣接する母材外表面２ばかなり広い範
囲に渡って管の仮偲外周円３よりも外側に突出しており
１また。内面側溶接ビード４に隣接する母材内表面５も
かなり広い範囲に渡って管の仮想内周円６よりも外側に
突出している。かような外面側溶接ビードの削除は、管
の仮想外周円よりもやや大きい曲率半径を持つ切削工具
を用いて、第４図に示す如く、管の仮想外周円３よりも
外側に突出した部分７を切削除去するのが通例である。- m, the shaping of the squelp edge tends to be insufficient, and the radius of curvature near the squelp edge just before entering the squeeze roll is larger than the nominal diameter of the pipe radius.
The welded part tends to protrude slightly outside the imaginary outer circumference of the pipe. Therefore, as shown in FIG. 3, the outer surface 2 of the base material adjacent to the outer weld bead 1 protrudes outward from the temporary outer circumference 3 of the tube over a fairly wide range. The inner surface 5 of the base material adjacent to the inner weld bead 4 also protrudes outward from the imaginary inner circumferential circle 6 of the tube over a fairly wide range. To remove such an outer weld bead, use a cutting tool with a radius of curvature slightly larger than the imaginary outer circumference of the pipe to remove the part that protrudes outside the imaginary outer circumference 3 of the pipe, as shown in Figure 4. It is customary to cut and remove 7.
だが、従来からのこの削除方法では９第４図に示す如く
、外面側溶接と一部とともに母材の一部をも削除してし
まうので、溶接部に隣接する母材の肉厚減少が避けられ
なかった（第５図）、また、そのようにして外面側溶接
と一部を削除後サイジング・ロールにより管の外周が真
円になるように成形した電縫管では、溶接部に隣接する
母材の肉厚が最小となった位置で、管の内面の曲率が最
小となることも避けられなかった（第５図）。However, with this conventional deletion method, as shown in Figure 9, a part of the base metal is also deleted along with a part of the outer weld, so a decrease in the thickness of the base metal adjacent to the weld is avoided. (Fig. 5), and in the case of ERW pipes that were formed in such a way so that the outer circumference of the pipe was a perfect circle after removing the outer surface weld and a part using a sizing roll, It was also inevitable that the curvature of the inner surface of the tube would be at its minimum at the position where the wall thickness of the base material was at its minimum (Fig. 5).
溶接部付近で母材の肉厚が減少し、かつその位置で管の
内面の曲率が最小になることは、管の機械的性質に対し
て大きなマイナスであることがわかった。特に５管が曲
げ成形された後１強度部材として使用される場合には、
使用中に管の円周方向に大きな応力が作用すると、溶接
部に隣接した肉厚が最小でありかつ管の内周の曲率が最
小である母材部分が切欠として作用し、疲労寿命の低下
およびその他の不都合を招（ことがわかった。It was found that the decrease in the wall thickness of the base metal near the weld and the minimum curvature of the inner surface of the tube at that location have a large negative impact on the mechanical properties of the tube. Especially when the 5-tube is used as a 1-strength member after being bent and formed,
When a large stress is applied to the tube in the circumferential direction during use, the part of the base material adjacent to the weld where the wall thickness is the smallest and the inner circumference of the tube has the smallest curvature acts as a notch, reducing fatigue life. and other inconveniences.
また、母材表面が耐熱性および／または耐食性の観点か
ら酸化物皮膜や表面処理皮膜により被覆されている場合
には、外面側溶接ビードの削除幅は狭い程好ましいが、
従来からの削除方法によれば外面側溶接ビード幅の少な
くとも２倍の幅で被覆のない母材裸面が生してしまい、
耐熱性や耐食性の劣化を招く不都合があった。In addition, if the base material surface is covered with an oxide film or a surface treatment film from the viewpoint of heat resistance and/or corrosion resistance, the smaller the removal width of the outer weld bead, the better.
According to the conventional removal method, a bare surface of the base material with no coating is created with a width at least twice the width of the outer weld bead.
This had the disadvantage of causing deterioration in heat resistance and corrosion resistance.
本発明の主たる一つの目的は、従来技術の前記のような
不都合を克服した。溶接部に隣接する母材の肉厚減少の
小さい）Ｗ肉電縫管の製造法を提供することである。One main object of the present invention is to overcome the above-mentioned disadvantages of the prior art. It is an object of the present invention to provide a method for manufacturing a W-walled electric resistance welded pipe in which the wall thickness of the base material adjacent to the welded portion is small.
本発明の他の一つの目的は、管の内面の曲率変化を最小
にした１肉電縫管の製造法を提供することである。Another object of the present invention is to provide a method for manufacturing a single-wall electric resistance welded tube that minimizes changes in curvature of the inner surface of the tube.
本発明のさらに一つの目的は、外面ｆ！１．’ｌ ？６
接ビード削除による母材新生面の面積を最小に留めた薄
肉電縫管の製造法を提供することである。A further object of the invention is that the outer surface f! 1. 'l? 6
It is an object of the present invention to provide a method for manufacturing a thin-walled electric resistance welded pipe in which the area of the new surface of the base material is minimized by removing the contact bead.
本発明によれば、これらの目的は、帯板を連続的にフォ
ーミング・ロールにより略円弧状に成形し、得られたス
ケルプの両エツジをスクイズ・ロールで電気抵抗溶接に
より接合し、得られた管の外面および内面に突出した溶
接ビードを削除し。According to the present invention, these objects are achieved by continuously forming a strip into a substantially circular arc shape using a forming roll, and joining both edges of the obtained skeleton by electric resistance welding using a squeeze roll. Remove any protruding weld beads on the outside and inside surfaces of the tube.
そして管をサイジング・ロールにより整形することから
なる薄肉電縫管の製造法において、外面側の切削残存溶
接ビード高さを０．０５〜０．５ ｍｍとした後、サイ
ジング整形することを特徴とする薄肉電縫管の製造法に
より達成される。The method for manufacturing thin-walled ERW pipes, which involves shaping the pipe with a sizing roll, is characterized in that the height of the cut remaining weld bead on the outer surface side is set to 0.05 to 0.5 mm, and then sizing and shaping is carried out. This is achieved by a method for manufacturing thin-walled ERW tubes.
第１図は、スクイズ・ロールで溶接した管の外面側溶接
ビードを１本発明にしたがい、僅かだけ残して削除した
場合における。管の溶接部付近の横断面形状を示す斜視
図である。スクイズ・ロールで溶接された電縫管の溶接
部付近の横断面形状は、第３図に示すように、外面側溶
接ビード１とそれに隣接する母材２とがかなりな広い範
囲に渡って管の仮想外円周３よりも外側に突出している
。FIG. 1 shows a case in which one weld bead on the outer surface of a tube welded with a squeeze roll is removed, leaving only a small portion, according to the present invention. FIG. 3 is a perspective view showing a cross-sectional shape of a pipe near a welded portion. As shown in Fig. 3, the cross-sectional shape near the weld of an ERW pipe welded with a squeeze roll is such that the outer weld bead 1 and the base metal 2 adjacent to it extend over a fairly wide area. It protrudes outward from the imaginary outer circumference 3 of .
本発明においては、第１図に示すように、外面側溶接ビ
ードが高さ０．０５〜０．５ ｍｍの範囲で残存するよ
うに外面側溶接ビードの削除を行う。第１図において、
９は本発明方法で削除する外面側溶接ビードの部分を示
し、１０はこのビード削除後に生ずる新生面を示してい
る。１１は切削残存溶接ビード高さを表していおり、こ
の１１の高さを本発明では０．０５〜０．５ ｍｍとす
る。In the present invention, as shown in FIG. 1, the outer weld bead is removed so that the outer weld bead remains within a height range of 0.05 to 0.5 mm. In Figure 1,
Reference numeral 9 indicates a portion of the weld bead on the outer surface side to be removed by the method of the present invention, and 10 indicates a new surface generated after this bead removal. Reference numeral 11 represents the height of the weld bead remaining after cutting, and the height of this 11 is set to 0.05 to 0.5 mm in the present invention.
このように外面側の切削残存溶接ビード高さを０．０５
〜０．５ ｏｈｍとした後、サイジング整形して得た本
発明の電縫管の溶接部付近における肉厚および内面の曲
率半径の変動の様子を、第２図に模式的に示す。第２図
に示す如く、外面側溶接ビードを僅かに残存せしめるこ
とにより、溶接部に隣接する母材の肉厚が減少する現象
を防止することができる。加えて、僅かに残存した外面
側溶接ビード１０は、サイジング・ロールによる整形の
際、内側へ押し戻されるので、第２図に示す如く、溶接
部に隣接する母材の内面の曲率は、管の仮想内円周６の
曲率と殆ど等しくなる。In this way, the height of the cutting remaining weld bead on the outer surface side is set to 0.05.
FIG. 2 schematically shows how the wall thickness and the radius of curvature of the inner surface of the electric resistance welded tube of the present invention, which was obtained by sizing and shaping the tube to a thickness of 0.5 ohm, were changed in the vicinity of the welded portion. As shown in FIG. 2, by allowing a small amount of the weld bead to remain on the outer surface side, it is possible to prevent the phenomenon in which the thickness of the base material adjacent to the weld portion decreases. In addition, the slight remaining outer weld bead 10 is pushed back inward during shaping by sizing rolls, so the curvature of the inner surface of the base metal adjacent to the weld is reduced to the same as that of the pipe, as shown in FIG. The curvature is almost equal to the curvature of the virtual inner circumference 6.
管の外面の真円度や表面ｔ■度を重視すれば、外面側溶
接ビードの残存高さをＯ（ゼロ）とするのが理想である
が、実際には電縫管製造ラインを流れる管は僅かではあ
るが常に揺＋Ｊ＋ しているので。If we place emphasis on the roundness of the outer surface of the pipe and the surface t■ degree, it would be ideal to set the remaining height of the outer weld bead to O (zero). Although it is a little, it is always shaking+J+.
母材表面にｔｔ傷を与えることなく安定して外面側溶接
ビードのみを削除することは殆ど不可能である、加えて
、僅かに残存する外面側Ｉ８接ビードは溶接に隣接する
母材の内面の曲率を管の仮想内円周の曲率に近ずける作
用がある。本発明の目的のためには、外面側溶接ビード
の切削残存高さを少なくとも０．０５ｍｍとすべきであ
ることがわかった。It is almost impossible to stably remove only the outer weld bead without causing tt scratches on the base metal surface.In addition, the slight remaining outer I8 weld bead is on the inner surface of the base metal adjacent to the weld. This has the effect of bringing the curvature of the pipe closer to the curvature of the virtual inner circumference of the pipe. It has been found that for the purposes of the present invention, the remaining cut height of the outer weld bead should be at least 0.05 mm.
また、外面側溶接ビードの残存高さが０．５ｍｍを実質
的に超えると、管の外面の真円度や表面粗度が低下する
のみならず、残存する外面側溶接ビードの縁が切欠とし
て作用する傾向がある。それ故外面側溶接ビードの切削
残存高さの上限値は０．５ｍｍとする。Furthermore, if the remaining height of the outer weld bead substantially exceeds 0.5 mm, not only will the roundness and surface roughness of the outer surface of the pipe deteriorate, but the edge of the remaining outer weld bead will become a notch. It tends to work. Therefore, the upper limit of the cutting remaining height of the outer weld bead is set to 0.5 mm.
以下、比較実験結果により１本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail based on the results of comparative experiments.
対照試料として、従来からの方法により、溶接後向面側
溶接ビードおよび外面側溶接ビードを外面側溶接ビード
に隣接する母材の一部とともに削除した管体をサイジン
グ整形して普通鋼電縫管試料（ＳＴＫ旧１八、外径：
４２．７ｍｎ＋、肉厚： １．０ｍｍ ＞を多数作成し
た。本発明試料として、外面側溶接ビードを約０．１０
ｍｍの高さ残存させたものをサイジング整形した以外は
同様にして本発明によるｉ？ ｉＭ鋼電縫管試料を多数
作成した。これらの試ｔ１を様）ｆな拡管率（拡管後の
管の外径Ｉ）と原管の夕（径ｌ）。As a control sample, after welding, the opposite weld bead and the outer weld bead were removed along with a part of the base metal adjacent to the outer weld bead, and a pipe body was sized and shaped using a conventional method to produce an ordinary steel electric resistance welded pipe. Sample (STK old 18, outer diameter:
42.7mm+, wall thickness: 1.0mm> were produced in large numbers. As a sample of the present invention, the outer weld bead was approximately 0.10
i? according to the present invention in the same manner except that the remaining height of mm was sized and shaped. A large number of iM steel ERW pipe samples were prepared. For these tests t1), the tube expansion rate (outer diameter I of the tube after tube expansion) and the rate (diameter l) of the original tube.
との比）で拡管加工に付した。拡管加工は８個の分割爪
を有するサイザーにより行い、管の？８接部が隣接分割
爪の中間に来るように設定してサイザー拡管を行った。It was subjected to tube expansion processing at a ratio of The tube expansion process is performed using a sizer with eight split jaws. Sizer tube expansion was performed by setting the 8-joint part to be located between the adjacent split claws.
拡管長さは１００ｍｍ とした。拡管部に発生する割れ
およびネッキングの有無を（ｉＪｌ！察した。発生ずる
場合１割れは、ｌ容接部に隣接する母材部に発生した。The tube expansion length was 100 mm. The presence or absence of cracks and necking occurring in the tube expansion section was detected (iJl!). If so, one crack occurred in the base material adjacent to the welding section.
試験結果を第６図に示す。第６図によれば、この拡管試
験において２割れもネッキングも発生しない拡管率（限
界拡管・０）は。The test results are shown in Figure 6. According to Figure 6, what is the tube expansion rate (limit tube expansion: 0) at which neither cracking in two nor necking occurs in this tube expansion test?
対照試料の場合１．１１〜１．１２に過ぎないのに対し
。Whereas for the control sample it was only 1.11-1.12.
本発明試料では１．１８〜１．２０と拡管性能が格段に
向上していることが明らかである。It is clear that the sample of the present invention has a significantly improved tube expansion performance of 1.18 to 1.20.
対照試料として、従来がらの方法により、ン容接後向面
側溶接ビードおよび外面側溶接ビードを外面側溶接ビー
ドに隣接する母材の一部とともに削除した管体をサイジ
ング整形して４５キロ級の高張力鋼電縫管（外径： ４
２．１ｍｍ、 肉厚７１．６ｍｍ ）を多数作成した。As a control sample, a 45 kg class pipe was prepared by removing the weld bead on the rear face side and the weld bead on the outer face together with a part of the base metal adjacent to the weld bead on the outer face using the conventional method. High tensile strength steel ERW pipe (Outer diameter: 4
2.1 mm, wall thickness 71.6 mm).
本発明試料として、外面側）容接ビードを約０．１５ｍ
ｍの高さ残存させたものをサイジング整形した以外は同
様にして本発明による高張力鋼電縫管試料を多数作成し
た。各試料を曲げ成形した後１曲げ成形と同じ方向に両
振りの繰り返し曲げモーメントを負荷する疲労試験に付
した。曲げ部の曲げ半径は、管の中心線を基準として１
２０ｍｍとし１曲げ角度は、６０度とした。繰り返し曲
げモーメントを負荷すると２曲げ部の各部分に管の軸方
向および円周方向の応力が作用するが１曲げモーメント
の負荷方向に対し直角方向の位置における円周方向の応
力が最大応力となるので、管の溶接部が最大応力発生位
置となるように曲げ成形を行っておいて、繰り返し曲げ
モーメントをｆＬＱした。負荷した曲げモーメントの繰
り返し数が限界を超えると、疲労亀裂力畳容接部に隣接
する母材に発生し、）容接部に沿って管の軸方向に成長
した。As a sample of the present invention, the outer surface side) welding bead was approximately 0.15 m.
A large number of high tensile strength steel electric resistance welded pipe samples according to the present invention were prepared in the same manner except that the remaining pipes with a height of m were sized and shaped. After each sample was bent and formed, it was subjected to a fatigue test in which a double bending moment was applied repeatedly in the same direction as in the first bending. The bending radius of the bent part is 1 with respect to the center line of the pipe.
The length was 20 mm, and the angle of one bend was 60 degrees. When repeated bending moments are applied, stresses in the axial and circumferential directions of the pipe act on each part of the two bending parts, but the stress in the circumferential direction at a position perpendicular to the direction in which one bending moment is applied becomes the maximum stress. Therefore, bending was performed so that the welded part of the pipe was the position where the maximum stress occurred, and the repeated bending moment was fLQ. When the number of repetitions of the applied bending moment exceeded the limit, a fatigue crack force was generated in the base material adjacent to the tatami joint and grew in the axial direction of the pipe along the joint.
第７図は、この疲労試験の結果を２曲げモーメント−繰
り返し数線図で整理したものである。第７図によれば、
疲労ノテ命（疲労亀裂が発生するまでにｆＬ荷した曲げ
モーメントの繰り返し数）は２曲げモーメントの大きさ
が同一なら１本発明試料は対照試ネ４よりも略−桁値れ
ていることが明らかである。FIG. 7 shows the results of this fatigue test arranged in a 2-bending moment-repetition number diagram. According to Figure 7,
Fatigue life (the number of repetitions of bending moment loaded with fL until fatigue cracks occur) is 2. If the magnitude of the bending moment is the same, 1. The inventive sample is about an order of magnitude higher than the control sample 4. it is obvious.
対照試料として、従来からの方法により、溶接後向面側
溶接ビードおよび外面側溶接ビードを外面側溶接ビード
に隣接する母材の一部とともに削除した管体をサイジン
グ整形してアルミニラｌ、めっき鋼電縫管（外径： ４
２．７ｍｍ、肉ＦＩ ＋ １．６ｍｍ ） 全作成した
。本発明試料として、外面側溶接ビードを約０．１５ｍ
ｍの高さ残存させたものをサイジング整形した以外は同
様にして本発明によるアルミニウムめっき鋼電縫管を作
成した。外面側溶接ビートの削除幅は、対照試料の場合
４．０ｍｍ、 本発明試１トの場合１．０ｍｍであっ
た。どちらの試ｔ１についても、外面側溶接ビードの削
除面には、何等補修を施さなかった。両試料から５ｍｍ
ｍｍ長さの試験片を切取り、それらを電気マツフル炉に
より大気中８００℃で１０００時間連続加熱した。溶接
部の酸化による肉厚減少を観察することにより耐熱性を
ａ・７価した。As a control sample, after welding, the opposite weld bead and the outer weld bead were removed along with a part of the base metal adjacent to the outer weld bead, and a pipe body was sized and shaped using a conventional method to obtain aluminium l, plated steel. ERW pipe (outer diameter: 4
2.7mm, meat FI + 1.6mm) All were made. As a sample of the present invention, the outer weld bead was approximately 0.15 m long.
An aluminum-plated steel electric resistance welded pipe according to the present invention was produced in the same manner except that the pipe with a height of m remaining was sized and shaped. The removal width of the outer weld bead was 4.0 mm in the case of the control sample and 1.0 mm in the case of the first test sample of the present invention. In both trials t1, no repair was performed on the removed surface of the outer weld bead. 5mm from both samples
Test specimens with a length of mm were cut out, and they were continuously heated in an electric Matsufuru furnace at 800° C. for 1000 hours in the atmosphere. The heat resistance was evaluated by observing the decrease in wall thickness due to oxidation of the welded part.
第８図は、連続加熱後の対照試料の溶接部の横断山ｉを
示す写真（イ合二ｉ ： １５＜合）゛であるが、ン８
を区部は４べて酸化スケール化していることがわかる。Figure 8 is a photograph showing the cross-sectional peak i of the welded part of the control sample after continuous heating (if 2i: 15<combined).
It can be seen that all four areas have oxidized scale.
第９図は、連続加２後の本発明試料の溶接部の横断面を
示す倍率１５倍の写真である。本発明試料ではかなりの
酸化損耗が認められるものの、溶接部の肉ｊｒＬの杓２
０％は残存しており、かつ酸化ｉｆｆ耗を受けたｚＮ域
も対照試料のそれに比べて著しく狭いことがわかる。FIG. 9 is a photograph at a magnification of 15 times showing a cross section of a welded portion of a sample of the present invention after continuous application 2. Although considerable oxidation loss was observed in the sample of the present invention, the welded part of the welded part
It can be seen that 0% remains and the zN region that has undergone oxidative IF wear is also significantly narrower than that of the control sample.
第１図は本発明方法における電縫管の外面側溶接ビード
削除の様子を示す斜視図。
第２図は本発明による電縫管の溶接部付近における肉厚
および内面の曲率半径の変化を模式的に示す図。
第３図は円弧状に成形したス／ｙルプをスクイズ・ロー
ルで溶接した直後における管の溶接部の横断面図。
第４図は従来法における電縫管の外面側溶接ビード削除
の様子を示す斜視図。
第５図は従来法による電縫管の）容接部付近における肉
厚および内面の曲率半径の変化を模式的に示す図。
第６圓は本発明方法および従来法による普通鋼Ｔ、電縫
管拡管性能を比較表示するグラフ。
第７図は本発明方法および従来法による４５級高張力鋼
電縫管についての疲労試験結果を示すグラ乙
第８図は従来法によるアルミニウムめっき洞電縫管を大
気中８００℃で１０００時間連続加熱した後における溶
接部付近の横断面写真、そして第９図は本発明によるア
ルミニウムめっき１，１電縫管を大気中８００ ℃で１
０００時間連続加ｐ％した後における溶接部付近の横断
面写真、である。
ｌ・・外面側溶接ビード
２・・母材外表面
３・・管の仮想外円周
４・・内面側溶接ビード
５・・母材内表面
６・・管の仮想内円周
７・・従来法において削除される部分
８・・従来法においてビード削除後生ずる新生面
９・・本発明方法において削除される部分１０・・本発
明方法においてビード削除後生ずる新生面
１１・・本発明方法において削除されないで残存する外
面側溶接ビードの高さFIG. 1 is a perspective view showing how a weld bead on the outer surface of an electric resistance welded pipe is removed in the method of the present invention. FIG. 2 is a diagram schematically showing changes in the wall thickness and the radius of curvature of the inner surface near the welded part of the electric resistance welded pipe according to the present invention. FIG. 3 is a cross-sectional view of the welded part of the pipe immediately after welding the arc-shaped squeeze roll with a squeeze roll. FIG. 4 is a perspective view showing how a weld bead on the outer surface side of an electric resistance welded pipe is removed in a conventional method. FIG. 5 is a diagram schematically showing changes in the wall thickness and the radius of curvature of the inner surface in the vicinity of the contact part of the electric resistance welded pipe according to the conventional method. The sixth circle is a graph that compares and displays the expansion performance of common steel T and ERW pipes according to the method of the present invention and the conventional method. Figure 7 shows the fatigue test results for 45 class high tensile strength steel ERW pipes by the method of the present invention and the conventional method. Figure 8 shows the fatigue test results for aluminum-plated ERW pipes by the conventional method at 800°C in the atmosphere for 1000 hours. A cross-sectional photograph of the vicinity of the welded part after heating, and FIG.
This is a cross-sectional photograph of the vicinity of the welded part after continuous addition of p% for 000 hours. l...Outer side weld bead 2...Base metal outer surface 3...Imaginary outer circumference of the pipe 4...Inner side weld bead 5...Base metal inner surface 6...Imaginary inner circumference of the pipe 7...Conventional Portion 8 that is deleted in the conventional method: New surface 9 that occurs after bead deletion in the conventional method. Portion 10 that is deleted in the method of the present invention. New surface 11 that occurs after bead deletion in the method of the present invention.. that is not deleted in the method of the present invention. Height of remaining outer weld bead
Claims (1)
成形し、得られたスケルプの両エッジをスクイズ・ロー
ルで電気抵抗溶接により接合し、得られた管の外面およ
び内面に突出した溶接ビードを削除し、そして管をサイ
ジング・ロールにより整形することからなる薄肉電縫管
の製造法において、外面側の切削残存溶接ビード高さを
０．０５〜０．５ｍｍとした後、サイジング整形するこ
とを特徴とする薄肉電縫管の製造法。The strip is continuously formed into a substantially circular arc shape using a forming roll, and both edges of the resulting skelp are joined by electric resistance welding using a squeeze roll, with protruding weld beads on the outer and inner surfaces of the resulting tube. In the manufacturing method of thin-walled ERW pipes, which involves removing the weld bead and shaping the pipe with a sizing roll, the height of the cut remaining weld bead on the outer surface side is set to 0.05 to 0.5 mm, and then sizing and shaping is performed. Characteristic manufacturing method for thin-walled ERW pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23708286A JPS6393424A (en) | 1986-10-07 | 1986-10-07 | Manufacture of thin electric welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23708286A JPS6393424A (en) | 1986-10-07 | 1986-10-07 | Manufacture of thin electric welded pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6393424A true JPS6393424A (en) | 1988-04-23 |
Family
ID=17010144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23708286A Pending JPS6393424A (en) | 1986-10-07 | 1986-10-07 | Manufacture of thin electric welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6393424A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015168003A (en) * | 2014-03-11 | 2015-09-28 | Ｊｆｅスチール株式会社 | Electric resistance welded pipe and its manufacturing method |
| WO2016139931A1 (en) * | 2015-03-03 | 2016-09-09 | Ｊｆｅスチール株式会社 | Electric resistance welded steel pipe having recognizable seam, and method for manufacturing same |
-
1986
- 1986-10-07 JP JP23708286A patent/JPS6393424A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015168003A (en) * | 2014-03-11 | 2015-09-28 | Ｊｆｅスチール株式会社 | Electric resistance welded pipe and its manufacturing method |
| WO2016139931A1 (en) * | 2015-03-03 | 2016-09-09 | Ｊｆｅスチール株式会社 | Electric resistance welded steel pipe having recognizable seam, and method for manufacturing same |
| JPWO2016139931A1 (en) * | 2015-03-03 | 2017-04-27 | Ｊｆｅスチール株式会社 | ERW steel pipe with seam portion distinguishable and manufacturing method thereof |
| KR20170107075A (en) * | 2015-03-03 | 2017-09-22 | 제이에프이 스틸 가부시키가이샤 | Electric resistance welded steel pipe having recognizable seam and method for manufacturing same |
| CN107405659A (en) * | 2015-03-03 | 2017-11-28 | 杰富意钢铁株式会社 | The electric welded steel pipe and its manufacture method that welding seam part can identify |
| US10369655B2 (en) | 2015-03-03 | 2019-08-06 | Jfe Steel Corporation | Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same |
| US11045896B2 (en) | 2015-03-03 | 2021-06-29 | Jfe Steel Corporation | Electric resistance welded steel pipe having identifiable seam portion and method for manufacturing the same |
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