JPS6120665A - Preventive method of terminal crack in automatic one-side welding - Google Patents
Preventive method of terminal crack in automatic one-side weldingInfo
- Publication number
- JPS6120665A JPS6120665A JP14187884A JP14187884A JPS6120665A JP S6120665 A JPS6120665 A JP S6120665A JP 14187884 A JP14187884 A JP 14187884A JP 14187884 A JP14187884 A JP 14187884A JP S6120665 A JPS6120665 A JP S6120665A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- welding
- terminal
- welded
- tab
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、２個の母材の溶接継手を片面自動溶接する
際における継手終端部の割れの発生を防止する片面自動
溶接の終端割れ防止方法に関する〔従来技術〕
一般に、船舶を建造する場合などでは合理化を図るため
に片面自動溶接が広く採用されている。[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a method for preventing cracking at the end of a welded joint in one-sided automatic welding, which prevents the occurrence of cracking at the end of the joint when automatically welding two base materials on one side. [Prior art related to method] In general, single-sided automatic welding is widely adopted in order to streamline the construction of ships.
ところが、この片面自動溶接では、溶接熱応力が原因と
なって溶接継手を形成する母材の終端回転変形が生じ易
いため、前記回転変形により継手の終端部に割れが発生
するという問題がある。However, in this single-sided automatic welding, there is a problem that the terminal end rotational deformation of the base material forming the welded joint is likely to occur due to welding thermal stress, and cracks occur at the terminal end of the joint due to the rotational deformation.
そこで従来、前記したような終端割れの発生を防止する
ために各種の方法が考えられており、その１つにスリッ
トタブ法と呼ばれる手法があり、これは回転変形による
継手終端部の変位速度を緩和しようとするものであり、
たとえば２個の母材の溶接継手を終端部（通常１ｍ程度
）を残して仮付は溶接し、前記終端部の端縁に、一側に
前記継手の溶接線とそれぞれ平行に１対のスリットが形
成されたタブ板の前記一側の端縁を強固に溶接すること
により、溶接時に、溶接トーチから発生するアークが前
記継手に沿って移動して前記アークが前記タフ板に到達
したときに、前記アークによる熱を前記両スリット内に
保持してタブ板全体の熱膨張を防止し、タブ板が熱膨張
してタブ板による継手終端部の拘束力が著しく弱まるこ
ともなく、継手終端部の回転変形が抑止されて終端割れ
の発生が防止される。Therefore, various methods have been considered in the past to prevent the occurrence of end cracks as described above, one of which is a method called the slit tab method, which reduces the displacement speed of the joint end due to rotational deformation. It seeks to alleviate
For example, a welded joint of two base materials is temporarily welded leaving a terminal end (usually about 1 m long), and a pair of slits are made on one side of the welding line parallel to the welding line of the joint at the edge of the terminal end. By firmly welding the edge of the one side of the tab plate on which the tab plate is formed, when the arc generated from the welding torch moves along the joint and reaches the tough plate during welding, , the heat generated by the arc is retained in both the slits to prevent thermal expansion of the entire tab plate, and the binding force of the tab plate on the joint end portion is not significantly weakened due to thermal expansion of the tab plate, and the joint end portion is prevented from thermally expanding. rotational deformation is suppressed and the occurrence of terminal cracks is prevented.
なお、継手終端部を仮付は溶接した場合、溶接が進んで
アークが継手の終端部に達したときに、前記アークによ
り前記終端部の仮付は溶接ビードが溶断し、それまで仮
付は溶接ビードにより拘束されていた前記終端部が一挙
に開放されて前記終端部に急激に回転変形が生じ、前記
タブ板による変位速度の緩和効果が減殺されることにな
るため、前記継手終端部の仮付は溶接を行なわないこと
を原則としている。Note that when the end of the joint is tack welded, when the welding progresses and the arc reaches the end of the joint, the weld bead of the tack at the end is fused by the arc, and until then the tack is welded. The terminal end portion, which had been restrained by the weld bead, is released all at once, causing rapid rotational deformation in the terminal end portion, and the effect of moderating the displacement speed by the tab plate is reduced. As a general rule, no welding is required for temporary attachment.
しかしこの場合、前記したように継手終端部を仮付は溶
接しないため、継手を形成する前記両岸材に目違いが生
じ易く、品質の低下は否めないという欠点がある。However, in this case, as described above, since the end portions of the joint are not tack welded, there is a drawback that misalignment is likely to occur in the materials on both sides forming the joint, resulting in an undeniable deterioration in quality.
さらに、両岸材の板厚が薄い場合やタブ板の大きさが小
さい場合には、タブ板の剛性が小さくなって継手終端部
の回転変形を十分に抑止できず、終端割れが生じるとい
う欠点がある。Furthermore, if the thickness of the material on both sides is thin or the size of the tab plate is small, the rigidity of the tab plate becomes small and rotational deformation of the joint end cannot be sufficiently suppressed, resulting in end cracking. There is.
この発明は、前記の点に留意してなされたものであり、
２個の母材の溶接継手を片面自動溶接する際に、継手終
端部の割れの発生を確実に防止することを目的とする。This invention was made with the above points in mind,
The purpose is to reliably prevent the occurrence of cracks at the end of the joint when automatically welding a weld joint between two base materials on one side.
この発明は、２個のタブ板を接合し、前記両タブ板の接
合部の一側の両側に平行にそれぞれ前記両タブ板の一端
縁に開口したスリットを形成するとともに、前記接合部
の他側を溶接し、前記接合部の一側を２個の母材の溶接
継手に連続させて前記両タブ板の前記一端縁を前記両岸
材の端縁に溶接し、前記継手の端部および前記接合部の
前記一側を予め連続シーリング溶接し、前記継手の終端
部の溶接前に前記接合部の中央部近辺の未溶接部分を予
め加熱しておくことを特徴とする片面自動溶接の終端割
れ防止方法である。In this invention, two tab plates are joined, and a slit is formed in parallel on both sides of one side of the joint between the two tab plates, each opening at one end edge of the both tab plates, and a slit is formed in the other side of the joint between the two tab plates. one side of the joint is continuous with the welded joint of the two base metals, and the one end edge of both tab plates is welded to the edge of the both bank members, and the end of the joint and The end of one-sided automatic welding, characterized in that the one side of the joint is subjected to continuous seal welding in advance, and the unwelded part near the center of the joint is heated in advance before welding the end of the joint. This is a method to prevent cracking.
したがって、この発明の片面自動溶接の終端割れ防止方
法によると、それぞれスリットが形成され互いに接合さ
れた２個のタブ板を両岸材に溶接し、溶接継手の端部お
よび両タブ板の接合部の一側を予め連続シーリング溶接
するとともに、継手の終端の溶接前に接合部の中央部近
辺の未溶接部分を予め加熱しておくことにより、溶接時
に継手終端部のンーリングビードが仮付は溶接によるヒ
ートのように急激に溶融せずに段階的に溶融するため、
継手終端部を十分に拘束することができ、継手終端部の
回転変形を確実に抑止することができるとともに、予熱
により、両タブ板の溶接熱による急膨張を抑制すること
ができるため、継手終端部の急激な変形を防止すること
が可能となり、継手終端部の割れを確実に防止すること
ができ、溶接品質の向上を図ることが可能となる。Therefore, according to the method for preventing end cracking in single-sided automatic welding of the present invention, two tab plates each having a slit and joined to each other are welded to both bank members, and the ends of the welded joint and the joint of both tab plates are welded to each other. By performing continuous seal welding on one side in advance and preheating the unwelded part near the center of the joint before welding the end of the joint, the rolling bead at the end of the joint will not be temporarily attached during welding. Because it melts gradually instead of rapidly like the heat caused by welding,
The end of the joint can be sufficiently restrained, and rotational deformation of the end of the joint can be reliably suppressed, and rapid expansion due to welding heat of both tab plates can be suppressed by preheating. This makes it possible to prevent sudden deformation of the joint, reliably prevent cracking at the end of the joint, and improve welding quality.
つぎに、この発明を、その１実施例を示した図面ととも
に詳細に説明する。Next, the present invention will be described in detail with reference to drawings showing one embodiment thereof.
図面において、（Ｉａ）、（ｌｂ）は平板状の２個の同
厚の母材、（２）は両岸材（ｌａ）、（ｌｂ）により形
成された溶接継手、（３ａ）、（３ｂ）は互イニ接合さ
れた母材（ｌａ） 。In the drawings, (Ia) and (lb) are two flat base materials of the same thickness, (2) are welded joints formed by both side materials (la) and (lb), and (3a) and (3b). ) are base materials (la) that are mutually joined.
（ｌｂ） 、！： 同厚で長さＤ（７）左、右タブ板、
（４ａ）、（４ｂ）は両タブ板（３ａ）、（３ｂ）の接
合部（５）の前側の左、右の両側に、継手（２）に平行
にそれぞれ両タブ板（３ａ）、（３ｂ）の前端縁に開口
して形成された長さＡのスリット、（６ａ）、（６ｂ）
は左タブ板（３ａ）の前端縁のスリット（４ａ）の左方
、および右タブ板（３１））の前端縁のスリット（４ｂ
）の右方にそれぞれ形成されたＶ字形の開先であり、接
合部（５）の前側が継手（２）に連続して両タブ板（３
ａ）、（３ｂ）が配設され、開先（６）が溶接されて両
タブ板（３ａ）、（３１））の前端縁が両岸材（ｌａ）
、（ｌｂ）の後端縁に接合されている。(lb),! : Same thickness and length D (7) left and right tab plates,
(4a) and (4b) are placed on both the left and right sides of the front side of the joint (5) of both tab plates (3a) and (3b), parallel to the joint (2), respectively. 3b) A slit of length A opened at the front edge of (6a), (6b)
are to the left of the slit (4a) on the front edge of the left tab plate (3a), and to the left of the slit (4b) on the front edge of the right tab plate (31).
) are V-shaped grooves formed on the right side of each tab plate (3), and the front side of the joint (5) continues to the joint (2).
a) and (3b) are arranged, and the groove (6) is welded so that the front edges of both tab plates (3a) and (31)) are connected to both bank members (la).
, (lb).
そして、接合部（５）を後端縁から距離Ｂにわたり余盛
溶接して両タブ板（３ａ）、（３ｂ）を接合したのち、
仮付定盤上に両岸材（ｌａ）、（ｌｂ）および両タブ板
（３ａ）。Then, after welding the joint part (5) over a distance B from the rear edge to join both tab plates (3a) and (3b),
Both banks (la), (lb) and both tab plates (3a) are placed on the temporary mounting surface plate.
（３ｂ）を載置し、接合部（５）の前端縁が継手（２）
に連続するように、両タブ板（３ａ）、（３ｂ）の前端
縁を両岸材（ｌａ）、（ｌｂ） ニ当接させて両開光（
６ａ）、（６ｂ）を余盛溶接するとともに、開先（６ａ
）、、（６ｂ）の端部（Ｒ）を角巻き溶接し、継手（２
］の後端縁から距離Ｃにわたる継手（２）の終端部、お
よび接合部（５）の前端縁から距離Ａにわたる接合部（
５）の前側を連続シーリング溶接して多層のシーリング
ビードを形成する。(3b) is placed, and the front edge of the joint (5) is the joint (2).
The front edges of both tab plates (3a) and (3b) are brought into contact with both bank members (la) and (lb) so that they are continuous with each other.
6a) and (6b) are welded, and the groove (6a)
), , (6b) are square-wound welded to form a joint (2
] The terminal end of the joint (2) extending a distance C from the rear edge, and the joint (5) extending a distance A from the front edge of the joint (5)
5) Continuous sealing welding is performed on the front side to form a multilayer sealing bead.
さらに、継手（２）の溶接を開始し、溶接トーチからの
アークを継手（２）に沿って移動して継手（２）を溶接
し、前記アークが継手（２）の終端を溶接する前に、接
合部（５）の中央部近辺の未溶接部分、すなわち第３図
中の斜線部分栃約６００℃まで加熱し、継手（２）の終
端から接合部（５）を溶接し、接合部（５）の前端縁か
ら距離への点まで溶接すれば、溶接を終了する。Furthermore, start welding the joint (2), move the arc from the welding torch along the joint (2) to weld the joint (2), and before said arc welds the terminal end of the joint (2). , the unwelded part near the center of the joint (5), that is, the shaded area in Figure 3, is heated to about 600°C, and the joint (5) is welded from the end of the joint (2) to form a joint ( Welding is completed by welding to a point within the distance from the front edge of 5).
そして、前記した手順に従い、板厚７ ｍｉ〜１７鰭。Then, according to the above-described procedure, the plate thickness was 7 mm to 17 fins.
継手長７ｍ〜１６５ｍの溶接継手の溶接を実験的に行な
った結果、終端割れの発生数は次表のようになり、
終端割れは全く発生しなかった。As a result of experimental welding of welded joints with joint lengths of 7 m to 165 m, the number of end cracks that occurred was as shown in the table below, and no end cracks occurred.
したがって、前記実施例によると、継手（２）の終端部
および接合部（５）の前側を予め連続シーリング溶接し
たため、溶接時に継手（２）の終端部のシーリングビー
ドが仮付は溶接によるヒートのように急激に溶融せずに
段階的に溶融し、継手（２）の終端部を十分に拘束する
ことができ、継手（２）の終端部の回転変形を抑えるこ
とが可能となり、しかも従来のスリットタブ法のように
両母材（ｌａ）、（ｌｂ）の終端部に目違いが発生する
こともない。Therefore, according to the above embodiment, since the terminal end of the joint (2) and the front side of the joint (5) were continuously seal-welded in advance, the sealing bead at the terminal end of the joint (2) was temporarily attached during welding due to the heat generated by welding. It is possible to melt in stages without melting suddenly, and to sufficiently restrain the terminal end of the joint (2), making it possible to suppress rotational deformation of the terminal end of the joint (2). Unlike the slit tab method, there is no mismatch between the ends of both base materials (la) and (lb).
さらに、継手（２）の終端の溶接前に接合部（５）の中
央部近辺の未溶接部分を予め加熱しておくため、両タブ
板（３ａ）、（３ｂ）がアーク熱により急膨張すること
を抑制でき、継手（２）の終端部の急激な変形を防止す
ることが可能となり、継手（２）の終端部の割れの発生
を確実に防止することができ、溶接品質のれの発生率が
約５９６であったのに対し、接合部（５）の中央部を溶
接しないため、終端割れの発生を確実に防止することが
可能となった。Furthermore, since the unwelded part near the center of the joint (5) is preheated before welding the end of the joint (2), both tab plates (3a) and (3b) expand rapidly due to arc heat. This makes it possible to prevent sudden deformation of the end of the joint (2), reliably prevent the occurrence of cracks at the end of the joint (2), and improve welding quality. The ratio was about 596, but since the center of the joint (5) was not welded, it became possible to reliably prevent the occurrence of end cracks.
図面は、この発明の片面自動溶接の終端割れ防止方法の
１実施例を示し、第１図は母材およびタブ板の分離斜視
図、第２図は母材およびタブ板を溶接する際の切断左側
面図、第３図は溶接した母材およびタフ板の平面図であ
る。
（ｌａ）、（１１）） 母材、＋２１ ・＝溶接継手
、（３ａ）、（３ｂ） タフ板、（４ａ）、（４，１
）） スリット、（５）・・・接合部。The drawings show an embodiment of the method for preventing end cracking in single-sided automatic welding according to the present invention, in which Fig. 1 is an isolated perspective view of the base material and the tab plate, and Fig. 2 is a cutting diagram when welding the base material and the tab plate. The left side view and FIG. 3 are plan views of the welded base material and tough plate. (la), (11)) Base metal, +21 ・=welded joint, (3a), (3b) Tough plate, (4a), (4,1
)) Slit, (5)... joint.
Claims (1)
一側の両側に平行にそれぞれ前記両タブ板の一端縁に開
口したスリットを形成するとともに、前記接合部の他側
を溶接し、前記接合部の一側を２個の母材の溶接継手に
連続させて前記両タブ板の前記一端縁を前記両母材の端
縁に溶接し、前記継手の端部および前記接合部の前記一
側を予め連続シーリング溶接し、前記継手の終端部の溶
接前に前記接合部の中央部近辺の未溶接部分を予め加熱
しておくことを特徴とする片面自動溶接の終端割れ防止
方法。(1) Two tab plates are joined, and slits are formed in parallel on both sides of one side of the joint between the tab plates, each opening at one edge of the tab plates, and on the other side of the joint. one side of the joint is continuous with the welded joint of the two base metals, and the one end edge of both tab plates is welded to the edge of both base metals, and the end of the joint and the End cracking of one-sided automatic welding, characterized in that the one side of the joint is continuously sealed welded in advance, and the unwelded part near the center of the joint is preheated before welding the end of the joint. How to prevent it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14187884A JPS6120665A (en) | 1984-07-09 | 1984-07-09 | Preventive method of terminal crack in automatic one-side welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14187884A JPS6120665A (en) | 1984-07-09 | 1984-07-09 | Preventive method of terminal crack in automatic one-side welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6120665A true JPS6120665A (en) | 1986-01-29 |
| JPH0318987B2 JPH0318987B2 (en) | 1991-03-13 |
Family
ID=15302261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14187884A Granted JPS6120665A (en) | 1984-07-09 | 1984-07-09 | Preventive method of terminal crack in automatic one-side welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6120665A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6326298A (en) * | 1986-07-18 | 1988-02-03 | Eihou Bussan Kk | End tab connection body for welding |
| CN103817400A (en) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | Arc striking and quenching device for coil-merging welding of nickel base alloy strip and using method of arc striking and quenching device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825892A (en) * | 1981-08-07 | 1983-02-16 | Hitachi Zosen Corp | Preventing method for terminal cracking in automatic one side welding |
-
1984
- 1984-07-09 JP JP14187884A patent/JPS6120665A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825892A (en) * | 1981-08-07 | 1983-02-16 | Hitachi Zosen Corp | Preventing method for terminal cracking in automatic one side welding |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6326298A (en) * | 1986-07-18 | 1988-02-03 | Eihou Bussan Kk | End tab connection body for welding |
| CN103817400A (en) * | 2014-02-28 | 2014-05-28 | 金川集团股份有限公司 | Arc striking and quenching device for coil-merging welding of nickel base alloy strip and using method of arc striking and quenching device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0318987B2 (en) | 1991-03-13 |
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