JP2005014001A - Welding method for corrugated partition corner part - Google Patents

Welding method for corrugated partition corner part Download PDF

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JP2005014001A
JP2005014001A JP2003178188A JP2003178188A JP2005014001A JP 2005014001 A JP2005014001 A JP 2005014001A JP 2003178188 A JP2003178188 A JP 2003178188A JP 2003178188 A JP2003178188 A JP 2003178188A JP 2005014001 A JP2005014001 A JP 2005014001A
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partition wall
corrugated
corrugated partition
welding
corner
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JP3808061B2 (en
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Yoshio Tanaka
義雄 田中
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Shin Kurushima Dockyard Co Ltd
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Shin Kurushima Dockyard Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding method for a corrugated partition corner part which can form a reinforcing structure for the corrugated partition corner part hardly causing cracks. <P>SOLUTION: In this welding method, the abutting portion between the corner part of the corrugated partition wall (vertical corrugated partition or horizontal corrugated partition) 7 and a tank top is arc-welded under atmosphere of carbon dioxide gas by a carbon dioxide gas arc welding device, a deposited metal (bead) is provided in the abutted portion (S101), and the surface of this deposited metal (bead) is formed into a prescribed shape by using a grinder (S102), and the prescribed area of the corrugated partition is TIG-welded by a TIG welding device (S103). In this way, the reinforcing structure for the corrugated partition corner part is obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、船舶の船倉を区切る波形隔壁のコーナー部の溶接方法に関するものである。
【０００２】
【従来技術】
一般に、この種のタンカーは、周知の通り、船側外板と、当該船側外板の内側に設けられた二重外板と、船底側に設けられたタンクトップと、前記タンクトップの船底外側に設けられた船底外板とにより基本的な船体構造が形成されており、かつ、二重外板・タンクトップ及び甲板で囲まれて船倉が構成されている。また、この種のタンカーでは、船倉を波形隔壁によって縦横に区切り複数のタンクを形成している。この波形隔壁は、積載した積み荷によって大きく撓むことが知られている。
【０００３】
図５は、タンカーのタンクを形成する波形隔壁の一部を示す斜視図である。図５において、タンク３は、タンクトップ５と、波形隔壁７と、二重外板（図示せず）と、甲板（図示せず）と、その他の部材とによって形成されている。また、ここでは、前記波形隔壁７は、例えば波形横置隔壁を例にとって説明するが、波形縦通隔壁でも同様であるものとする。また、前記波形隔壁７は、炭酸ガスアーク溶接装置を用いて、タンクトップ５に炭酸ガスアーク溶接されている。なお、図５において、符号９は前記波形隔壁７のコーナー部であり、このコーナー部９は図５では太線で示されている。
【０００４】
ところで、炭酸ガスアーク溶接装置は、周知のとおり、円筒形状をしたガスノズルの内部に電導体を設け、当該電導体の中心部に可動可能に溶接ワイヤを設け、前記ガスノズルと電導体との間から溶接部分に向ってイナートガスを吹き付け可能にした装置である。炭酸ガスアーク溶接装置による炭酸ガスアーク溶接は、炭酸ガスアーク溶接の分類に属するものである。
この炭酸ガスアーク溶接装置によって、母材に被溶接部材を溶接するものである。この際に、ガスノズルからは、溶接部分に向って遮蔽ガスとして炭酸ガスを吹き付けて溶接部分を空間より遮蔽し、溶接ワイヤを溶接中に溶融させて母材と被溶接部材との間に溶着金属を形成させている。
【０００５】
図６は、上述した波形隔壁をタンクトップ５に前記炭酸ガスアーク溶接装置で溶接した際のコーナー部の状態を示す図である。この図６に示すように、前記波形隔壁７のコーナー部９には、炭酸ガスアーク溶接装置でタンクトップ５に前記波形隔壁７を溶接したときに、前記波形隔壁７のコーナー部９とタンクトップ７との間に溶着金属１１，１１，…が形成されることになる。この炭酸ガスアーク溶接をする際に、前記コーナー部９における波形隔壁７側の溶着金属１１の上端部と当該波形隔壁７との間の部分には、図６に示すように、当該波形隔壁７の一部が溶融して切欠き部分Ｊ所謂アンダーカットが形成されてしまっていた。
【０００６】
図７は、前記波形隔壁コーナー部の溶接部の溶着金属をグラインダーで表面仕上げをした状態を示す図である。
また、前記波形隔壁７を前記タンクトップ５に前記炭酸ガスアーク溶接装置によって溶接して溶着金属１１，１１，…を形成した後には、グラインダーにより前記溶着金属１１，１１，…を研磨して所定の角度に表面仕上げをしていた。前記波形隔壁７のコーナー部９も、図８に示すように、前記溶着金属１１，１１，…の表面をグラインダーで一定角度に表面仕上げをしていた。
【０００７】
このようにグラインダーで表面仕上げをする場合、前記コーナー部９の波形隔壁７側の溶着金属１１の上端部と当該波形隔壁７との間の部分には、図７に示すように、当該波形隔壁７の一部が研磨によって切り取られて切欠き部分Ｊ’所謂アンダーカットが形成されてしまったり、さらに、前記溶着金属１１の下端部と前記タンクトップ５との間の部分には、図７に示すように、当該波形隔壁７の一部が研磨によって切り取られて切欠き部分Ｋ所謂アンダーカットが形成されてしまっていた。
【０００８】
ところで、上述したようにタンカー１は、積み荷の状態に応じて、タンクの高さ例えば１５［ｍ］の波形隔壁（波形縦通隔壁および波形横置隔壁）７にあっては３５〜４０［ｍｍ］も撓むことがわかっている。このような波形隔壁７の変位が当該波形隔壁７の各部にどのような応力を与えているかを検討してみる。
図８は、前記波形隔壁（コーナー部を含む）とタンクトップとの当接部分の各位置における応力分布を示す図であって、図８（ａ）は前記波形隔壁（コーナー部を含む）を、図８（ｂ）は当該波形隔壁（コーナー部を含む）とタンクトップとの当接部分の各位置における応力分布をそれぞれ示す図である。
【０００９】
この図８（ａ）において、前記波形隔壁７のコーナー部９ａは図示しない波形縦通隔壁から２番目のコーナー部であり、前記波形隔壁７のコーナー部９ｂは図示しない波形縦通隔壁から３番目のコーナー部である。また、図８において、前記波形縦通隔壁をゼロとしたときに、第２番目の波形隔壁コーナー部９ａは例えば１５００［ｍｍ］の距離にあるものとし、第３番目の波形隔壁コーナー部９ｂは例えば２４３０［ｍｍ］の距離にあることを示す。したがって、図８（ｂ）では、横軸に波形縦通隔壁からの距離［ｍｍ］を、縦軸に応力σｚ［Ｎ／ｍｍ２］を、それぞれ取ったものである。
【００１０】
この図８からもわかるように、前記波形隔壁７のコーナー部９ａ，９ｂと波形隔壁７との当接部分の各位置における応力分布は、前記波形隔壁コーナー部９ａ（略１５００［ｍｍ］の位置）では、その応力σｚが−４５４［Ｎ／ｍｍ２］となり、この部分を通過して図示左側に行くにしたがって応力σｚは小さくなり、距離が１６００［ｍｍ］に達すると以降は距離が２３００［ｍｍ］程度に達するまで、応力σｚは概ね−２５０［Ｎ／ｍｍ２］となり、再び、波形隔壁コーナー部９ｂの部分（略２４３０［ｍｍ］の位置）で応力σｚが−４６５［Ｎ／ｍｍ２］を示し、前記波形隔壁のコーナー部とタンクトップとの当接部分においては、これらの波形隔壁コーナー部９ａ、９ｂの部分が特に大きな応力を受けることが分かる。なお、図８（ｂ）において、例えば−２８１［Ｎ／ｍｍ２］で示した応力σｚは、表面平均応力を示している。
【００１１】
さらに、これらのことから、前記波形隔壁のコーナー部とタンクトップとの当接部分の各位置における応力分布をみると次のことが判明した。すなわち、前記タンク３によれば、前述したようにタンクが積み荷などの影響で波形隔壁７の形状が大きく撓むと、図８（ａ）及び図８（ｂ）に示すように、前記波形隔壁７のコーナー部９ａ及び前記波形隔壁７のコーナー部９ｂの部分に大きな応力集中が生じ、また、荷物を搬出すると応力集中がなくなり、これらが繰り返し行われ疲労破壊することがわかっている。
【００１２】
【発明が解決しようとする課題】
上述したように前記波形隔壁７のコーナー部９ａ，９ｂにおいて、大きな応力を受けたり、受けなかったりの繰り返しが行われると、図８に示すように、前記波形隔壁７のコーナー部９ａ，９ｂの溶接部分の切欠き部分Ｊ，Ｋには、大きな応力が加わったり無くなったりする繰り返しが集中し、ついには当該切欠き部分Ｊ，Ｋからクラックが発生するという問題点を有していた。
【００１３】
このように従来の構造ないしは工法では、当該波形隔壁７のコーナー部９に必然的に切欠き部分Ｊ，Ｋが形成されてしまい、上述したように上記各切欠き部分Ｊ，Ｋに大きな応力集中が生じる結果、当該切欠き部分Ｊ，Ｋがクラック発生に大きく寄与することになっていたため、当該切欠き部分Ｊ，Ｋに対して応力集中によるクラック発生を効果的に防止できる構造ないしは工法等が要求されていた。
【００１４】
そこで、本願発明者ら、前記波形隔壁のコーナー部とタンクトップとの当接部分における補強構造の数多くのモデル数を作製し、このモデルを試験片として、それぞれ疲労試験機で疲労試験した結果、後述する特定の処理を施した場合には、その応力強度が確実に高まることを確認し、その結果を実際に船舶の波形隔壁のコーナー部に応用した。
本発明は、前記波形隔壁のコーナー部とタンクトップとの当接部分に後述するような特定の処理を施すことによって、上述した問題点を解消し、クラックの発生を抑えた波形隔壁のコーナー部の溶接方法を提供することを目的とする。
【００１５】
【課題を解決するための手段】
上記目的を達成するため、請求項１記載の発明に係る波形隔壁のコーナー部の溶接方法は、タンカーの船倉を区切る波形隔壁のコーナー部の溶接方法であって、波形隔壁のコーナー部とタンクトップとの当接部分を炭酸ガスアーク溶接によって溶接して当該当接部分に溶接ビードを形成する工程と、当該溶接ビード表面を所定の形状に成形してなる成形工程と、前記溶接ビートの成形面の波形隔壁側の所定の領域と、前記固定部のタンクトップ側の所定の領域とをティグ溶接で溶接して補強部を形成する工程とを備えことを特徴とするものである。
請求項２記載の発明では、請求項１記載の波形隔壁のコーナー部の溶接方法において、前記所定の形状を形成する工程は、前記溶接ビードをグラインダで研磨してタンクトップ面に対して概ね４５度に形成されていることを特徴とするものである。
【００１６】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
図１は本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法及びこれによって形成された波形隔壁コーナー部の補強構造を説明するための図である。ここに、図１は、本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって形成された波形隔壁コーナー部の補強構造を示す図である。なお、図１に示す本発明の実施の形態において、図５ないし図８に示す部材と同一部材には同一の符号を付して説明をし、場合によっては説明を省略する。
【００１７】
これら図１において、本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって形成された波形隔壁コーナー部の補強構造３１は、タンカー１の船倉を区切る波形隔壁（波形縦通隔壁または波形横置隔壁）７のコーナー部９を補強する構造を示す断面図である。
【００１８】
本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって構成される波形隔壁コーナー部の補強構造３１は、波形隔壁７のコーナー部９とタンクトップ５との当接部分を炭酸ガスアーク溶接装置によって炭酸ガスアーク溶接して当該当接部分に溶接ビード（溶着金属）１１，１１，…を設け、当該溶接ビード１１の表面をグラインターで所定の形状Ｑに成形してなる固定部３３と、前記固定部３３の成形面の波形隔壁（波形縦通隔壁または波形横置隔壁）７側の所定の領域Ａｕと、前記固定部３３のタンクトップ７側の所定の領域Ａｄとをティグ溶接装置によってティグ溶接して所定のフランク角に形成された補強部３５とを設けたものである。
【００１９】
また、本実施の形態に係る波形隔壁コーナー部の補強構造３１において、前記所定の形状は、タンクトップ７に対してフランク角概ね４５度に形成されている。
ここに、ティグ溶接装置の説明を簡単にしておく。ティグ溶接装置は、円筒形状をしたガスノズルの内部に電導体を設け、当該電導体の中心部に非消耗電極を設け、前記ガスノズルと電導体との間から溶接部分に向ってアルゴンガスを吹き付け可能にした装置である。このティグ溶接装置によるティグ溶接は、炭酸ガスアーク溶接と同様にシールドガスアーク溶接の分類に属するものである。
【００２０】
このティグ溶接装置は、母材（例えばタンクトップ５）に被溶接部材（例えば波形隔壁７）を溶接する際に、別に設けた溶加材を使用し、この溶加材を溶かして前記母材（例えばタンクトップ５）に被溶接部材（例えば波形隔壁７）を溶接するものである。この際に、ガスノズルからは、溶接部分に向って遮蔽ガスとしてアルゴンガスを主成分とするイナートガスを吹き付けて溶接部分を空間より遮蔽し、非消耗電極を溶加材に近づけて当該溶加材を溶接中に溶融させて母材（例えばタンクトップ５）と被溶接部材（例えば波形隔壁７）との間にビートを形成させ、ビート形状が平坦であることと、スパッタが発生しない溶接にするようにしたものである。
【００２１】
このようなティグ溶接装置を用い、前記領域Ａｕでは、ティグ溶接装置によって形成される溶接ビードの面の角度を例えば６０［度］以下になるように設定されている。同様に、ティグ溶接装置を用いて、前記領域Ａｄでも、ティグ溶接装置によって形成される溶接ビードの面Ｍを５０［度］以下になるように設定されている。
【００２２】
このような波形隔壁コーナー部の補強構造３１は、次の図２に示す波形隔壁のコーナー部の溶接方法によって形成される。図２は、本発明の実施の形態に係る波形隔壁コーナー部の補強構造の製造方法を説明するためのフローチャートである。
この図２において、第１の工程では、波形隔壁（波形縦通隔壁あるいは波形横置隔壁）７のコーナー部９と前記タンクトップ５との当接部分を炭酸ガスアーク溶接装置によって炭酸ガスアーク溶接して当該当接部分に溶着金属（ビード）１１，１１，…を設けている（Ｓ１０１）。
【００２３】
ついで、第２の工程（成形工程）では、当該溶着金属（ビード）１１，１１，…の表面をグラインダーを用いて所定の形状Ｑに成形してなる（Ｓ１０２）。
さらに、第３の工程では、前記固定部３３の成形面の波形隔壁（波形縦通隔壁または波形横置隔壁）７側の所定の領域Ａｕと、前記固定部３３のタンクトップ５側の所定の領域Ａｄとをティグ溶接装置によってティグ溶接することにより溶接して補強部３５を設けている（Ｓ１０３）。
なお、第２の工程（前記所定の形状を形成する工程）は、前記溶着金属（ビード）１１，１１，…をグラインダーで研磨して前記タンクトップ５面に対して概ね４５度に形成するようにする。
【００２４】
図３は、本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法で形成した波形隔壁コーナー部の補強構造のモデルを示す図である。この図１において、波形隔壁コーナー部の補強構造のモデル６０は、母材Ｍ（この明細書では例えば前記タンクトップ５として説明した）の表裏面に対して、被溶接部材Ｊ（この明細書では例えば波形隔壁７）を、上記波形隔壁のコーナー部の溶接方法によって波形隔壁コーナー部の補強構造３１と同一構造に溶接したものである。
このような波形隔壁コーナー部の補強構造３１を有する波形隔壁コーナー部の補強構造のモデル６０の両被溶接部材Ｊのそれぞれを疲労試験機の試験台７１，７１に挟み込み、疲労試験をした。
【００２５】
図４は、上述した波形隔壁コーナー部の補強構造３１と同一構造に形成した波形隔壁コーナー部の補強構造のモデルや、その他の構造をした補強構造のモデルを複数作製し、これら複数作製した補強構造モデルを疲労試験機で試験した疲労試験結果を示す図であり、横軸に繰り返し回数［回］を、縦軸に応力振幅［ｋｇ／ｍｍ２］を、それぞれとったものである。
この図４において、試験片（ＡＳＷＥＬＤ（４５［度］）と試験片ＴＩＧ仕上げ（４５［度］）は、試験装置によって、１．Ｅ＋０４〜１．Ｅ＋０７［回］繰り返し試験が行なわれた。この試験の結果は次のとおりである。すなわち、試験片（ＡＳＷＥＬＤ（４５［度］））は炭酸ガスアーク溶接しただけで、タンクトップ７と仕上げ面との角度θ＝４５［度］のとき疲労試験結果である。
【００２６】
試験片（ＴＩＧ（４５［度］））は炭酸ガスアーク溶接しさらにティグ溶接して波形隔壁コーナー部の補強構造３１と同様の構造にしたもので、タンクトップ７と仕上げ面との角度θ＝４５［度］のとき疲労試験結果である。
これらの結果を表にまとめたものが、表１である。
【００２７】
【表１】

Figure 2005014001
【００２８】
この表１からわかるように、試験片（ＡＳＷＥＬＤ（４５［度］）の場合は、疲労寿命比が１．００である。
また、試験片（ＴＩＧ（４５［度］））の場合は、疲労寿命比が５．９３であることがわかる。
【００２９】
図４は、上述した波形隔壁コーナー部の補強構造３１と同一構造に形成した波形隔壁コーナー部の補強構造のモデルと、これに最も近い表面仕上げ形状に形成した試験片とを疲労試験機で疲労試験した疲労試験結果を示す図であり、横軸に繰り返し回数［回］を、縦軸に応力振幅［ｋｇ／ｍｍ２］を、それぞれとったものである。
【００３０】
この図４に示す試験結果により、波形隔壁のコーナー部１７の溶接ビード１９の形状によって疲労寿命の試験片（ＴＩＧ（４５［度］））に対する試験片（ＡＳＷＥＬＤ（４５［度］）の比（５．９３／１．００）は、最大で約６倍もの差があることがわかった。したがって、高応力部となる波形隔壁のコーナー部１７の所定の形状には充分注意が必要であり、本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって形成した波形隔壁コーナー部の補強構造３１が最も優れた性能を示すことがわかる。
【００３１】
以上説明したように本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって形成した波形隔壁コーナー部の補強構造３１によれば、波形隔壁７のコーナー部９とタンクトップ５との当接部分を炭酸ガスアーク溶接装置によって炭酸ガスアーク溶接して当該当接部分に溶接ビード（溶着金属）１１，１１，…を設け、当該溶接ビード１１，１１，…の表面をグラインターで所定の形状に成形してなる固定部３３と、前記固定部３３の成形面の波形隔壁（波形縦通隔壁または波形横置隔壁）側の所定の領域Ａｕと、前記固定部３３のタンクトップ５側の所定の領域Ａｄとをティグ溶接装置によってティグ溶接して所定角度に形成された補強部３５とを設けたので、疲労寿命が長くなって、波形縦通隔壁や波形横置隔壁のように大きく撓む隔壁であっても充分に固定されていて、クラックなどの発生を防ぐことができる。
【００３２】
【発明の効果】
以上説明したように本発明によれば、波形隔壁のコーナー部とタンクトップとの当接部分を炭酸ガスアーク溶接して当該当接部分に溶接ビードを設け、当該溶接ビードの表面を所定の形状に成形し、前記固定部の成形面の波形隔壁側の所定の領域と、前記固定部のタンクトップ側の所定の領域とをティグ溶接して所定角度に形成したので、疲労寿命が長くなって、波形隔壁のように大きく撓む隔壁であっても充分に固定されていて、クラックなどの発生を防ぐことができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法によって形成した波形隔壁コーナー部の補強構造を示す図である。
【図２】本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法を説明するためのフローチャートである。
【図３】本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法で形成された波形隔壁コーナー部の補強構造のモデルを示す図である。
【図４】本発明の実施の形態に係る波形隔壁のコーナー部の溶接方法で形成した波形隔壁コーナー部の補強構造と同一構造を有する波形隔壁コーナー部の補強構造のモデルを疲労試験機で疲労試験した疲労試験結果を示す図である。
【図５】タンカーのタンクを形成する波形隔壁の一部を示す斜視図である。
【図６】上述した波形隔壁をタンクトップに前記炭酸ガスアーク溶接装置で溶接した際のコーナー部の状態を示す図である。
【図７】前記波形隔壁コーナー部の溶接部の溶着金属をグラインダーで表面仕上げをした状態を示す図である。
【図８】前記波形隔壁コーナー部を含む隔壁及びコーナ部を含む隔壁の各位置における応力分布を示す図であ
【符号の説明】
１ タンカー
３ タンク
５ タンクトップ
７ 波形隔壁
９ コーナー部
１１ 溶着金属（ビード）
３１ 波形隔壁コーナー部の補強構造
３３ 固定部
３５ 補強部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for welding a corner portion of a corrugated partition wall that partitions a ship's hold.
[0002]
[Prior art]
In general, this type of tanker is, as is well known, a ship side skin, a double skin provided inside the ship side skin, a tank top provided on the bottom side, and a tank top outside the tank top. A basic hull structure is formed by the provided ship bottom skin, and a hold is composed of a double skin, tank top, and deck. Further, in this type of tanker, a cargo hold is divided vertically and horizontally by corrugated bulkheads to form a plurality of tanks. It is known that this corrugated partition wall is greatly bent by the loaded cargo.
[0003]
FIG. 5 is a perspective view showing a part of a corrugated partition wall forming a tanker tank. In FIG. 5, the tank 3 is formed by a tank top 5, a corrugated partition wall 7, a double outer plate (not shown), a deck (not shown), and other members. Here, the corrugated partition 7 will be described by taking a corrugated horizontal partition as an example, but the same applies to a corrugated longitudinal partition. The corrugated partition 7 is carbon dioxide arc welded to the tank top 5 using a carbon dioxide arc welding device. In FIG. 5, reference numeral 9 denotes a corner portion of the corrugated partition wall 7, and the corner portion 9 is indicated by a thick line in FIG.
[0004]
By the way, as is well known, a carbon dioxide arc welding apparatus is provided with a conductor inside a cylindrical gas nozzle, a movable wire is provided at the center of the conductor, and welding is performed between the gas nozzle and the conductor. It is a device that enables the inert gas to be blown toward the part. Carbon dioxide arc welding by a carbon dioxide arc welding apparatus belongs to the category of carbon dioxide arc welding.
A member to be welded is welded to the base material by the carbon dioxide arc welding apparatus. At this time, carbon dioxide gas is sprayed as a shielding gas from the gas nozzle toward the welded portion to shield the welded portion from the space, and the welding wire is melted during welding to weld metal between the base material and the member to be welded. Is formed.
[0005]
FIG. 6 is a view showing a state of a corner portion when the corrugated partition wall described above is welded to the tank top 5 by the carbon dioxide arc welding apparatus. As shown in FIG. 6, when the corrugated partition wall 7 is welded to the tank top 5 with a carbon dioxide arc welding apparatus, the corner portion 9 of the corrugated partition wall 7 and the tank top 7. .. Are formed between the two. When the carbon dioxide arc welding is performed, a portion of the corner portion 9 between the upper end portion of the weld metal 11 on the corrugated partition wall 7 side and the corrugated partition wall 7 is formed as shown in FIG. A part melted and a notch portion J so-called undercut was formed.
[0006]
FIG. 7 is a view showing a state in which the weld metal at the welded portion of the corrugated partition wall corner is surface-finished with a grinder.
Further, after the corrugated partition wall 7 is welded to the tank top 5 by the carbon dioxide arc welding apparatus to form the weld metal 11, 11,..., The weld metal 11, 11,. The surface was finished at an angle. As for the corner part 9 of the corrugated partition wall 7, as shown in FIG. 8, the surface of the weld metal 11, 11,.
[0007]
When the surface finish is performed by the grinder as described above, the corrugated partition wall as shown in FIG. 7 is provided between the upper end portion of the weld metal 11 on the corrugated partition wall 7 side of the corner portion 9 and the corrugated partition wall 7. 7 is cut off by polishing to form a notch portion J ′, a so-called undercut, or a portion between the lower end portion of the weld metal 11 and the tank top 5 is shown in FIG. As shown, a part of the corrugated partition wall 7 was cut off by polishing to form a notch portion K, so-called undercut.
[0008]
By the way, as described above, the tanker 1 is 35-40 [mm] in the corrugated bulkhead (corrugated longitudinal bulkhead and corrugated horizontal bulkhead) 7 having a tank height of, for example, 15 [m] depending on the state of the load. ] Is also known to bend. Let us examine what kind of stress is applied to each part of the corrugated partition wall 7 by such displacement of the corrugated partition wall 7.
FIG. 8 is a diagram showing a stress distribution at each position of a contact portion between the corrugated partition wall (including the corner portion) and the tank top, and FIG. 8A shows the corrugated partition wall (including the corner portion). FIG. 8B is a diagram showing the stress distribution at each position of the contact portion between the corrugated partition wall (including the corner portion) and the tank top.
[0009]
In FIG. 8A, the corner portion 9a of the corrugated partition wall 7 is the second corner portion from the corrugated longitudinal partition wall (not shown), and the corner portion 9b of the corrugated partition wall 7 is third from the corrugated longitudinal partition wall (not shown). It is a corner part. In FIG. 8, when the corrugated longitudinal partition wall is zero, the second corrugated partition corner portion 9a is, for example, at a distance of 1500 [mm], and the third corrugated partition corner portion 9b is For example, the distance is 2430 [mm]. Therefore, in FIG. 8B, the horizontal axis represents the distance [mm] from the corrugated longitudinal partition wall, and the vertical axis represents the stress σ z [N / mm 2 ].
[0010]
As can be seen from FIG. 8, the stress distribution at each position of the contact portion between the corners 9a, 9b of the corrugated partition 7 and the corrugated partition 7 is the position of the corrugated partition corner 9a (approximately 1500 mm). ), The stress σ z becomes −454 [N / mm 2 ], and the stress σ z decreases as it passes through this part and goes to the left side of the figure. When the distance reaches 1600 [mm], the distance becomes larger thereafter. The stress σ z is approximately −250 [N / mm 2 ] until it reaches about 2300 [mm], and again, the stress σ z is −465 [at the portion of the corrugated partition wall corner portion 9b (position of approximately 2430 [mm]). N / mm 2 ], and it can be seen that the corrugated partition wall corner portions 9a and 9b are subjected to particularly large stress at the contact portion between the corner portion of the corrugated partition wall and the tank top. In FIG. 8B, for example, a stress σ z indicated by −281 [N / mm 2 ] indicates a surface average stress.
[0011]
Furthermore, from these facts, the stress distribution at each position of the contact portion between the corner portion of the corrugated partition wall and the tank top was found as follows. That is, according to the tank 3, as described above, when the shape of the corrugated partition wall 7 is greatly bent due to the influence of loading or the like, the corrugated partition wall 7 as shown in FIGS. 8 (a) and 8 (b). It is known that a large stress concentration occurs at the corner portion 9a and the corner portion 9b of the corrugated partition wall 7, and the stress concentration disappears when the cargo is carried out, and these are repeatedly performed, resulting in fatigue failure.
[0012]
[Problems to be solved by the invention]
As described above, if the corner portions 9a and 9b of the corrugated partition wall 7 are repeatedly subjected to large stress or not, as shown in FIG. 8, the corner portions 9a and 9b of the corrugated partition wall 7 are The notches J and K of the welded portion have a problem in that the repetition of large stress being applied or lost concentrates and finally cracks are generated from the notches J and K.
[0013]
As described above, in the conventional structure or method, the notched portions J and K are inevitably formed in the corner portion 9 of the corrugated partition wall 7, and as described above, a large stress concentration occurs in the notched portions J and K. As a result, the notched portions J and K have greatly contributed to the generation of cracks. Therefore, there is a structure or construction method that can effectively prevent the occurrence of cracks due to stress concentration on the notched portions J and K. It was requested.
[0014]
Therefore, the inventors of the present application made a number of models of the reinforcing structure in the contact portion between the corner portion of the corrugated partition wall and the tank top, and as a result of performing a fatigue test with a fatigue tester as a test piece, It was confirmed that the stress intensity was surely increased when a specific treatment described later was applied, and the result was actually applied to the corner portion of the corrugated bulkhead of the ship.
The present invention eliminates the above-mentioned problems by applying a specific treatment as will be described later to the contact portion between the corner portion of the corrugated partition wall and the tank top, and suppresses the occurrence of cracks. An object of the present invention is to provide a welding method.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a method for welding a corner portion of a corrugated bulkhead according to the invention described in claim 1 is a method of welding a corner portion of a corrugated bulkhead separating a tanker's hold, and includes a corner portion of a corrugated bulkhead and a tank top. A step of forming a weld bead on the contact portion by welding the contact portion with carbon dioxide arc welding, a forming step of forming the weld bead surface into a predetermined shape, and a forming surface of the weld beat And a step of welding a predetermined region on the corrugated partition wall side and a predetermined region on the tank top side of the fixed portion by TIG welding to form a reinforcing portion.
According to a second aspect of the present invention, in the method for welding the corner portion of the corrugated partition wall according to the first aspect, the step of forming the predetermined shape is performed by polishing the weld bead with a grinder to approximately 45 with respect to the tank top surface. It is characterized by being formed at a time.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a method for welding a corner portion of a corrugated partition according to an embodiment of the present invention and a reinforcing structure of the corner portion of the corrugated partition formed thereby. FIG. 1 is a diagram showing a reinforcing structure for corrugated partition wall corners formed by the method for welding corrugated partition wall corners according to the embodiment of the present invention. In the embodiment of the present invention shown in FIG. 1, the same members as those shown in FIGS. 5 to 8 are denoted by the same reference numerals, and the description thereof will be omitted in some cases.
[0017]
In these FIG. 1, the corrugated partition wall corner reinforcing structure 31 formed by the corrugated partition corner welding method according to the embodiment of the present invention includes a corrugated partition wall (corrugated longitudinal partition wall or corrugated partition wall) that partitions the tanker 1 hold. It is sectional drawing which shows the structure which reinforces the corner part 9 of (horizontal partition) 7. FIG.
[0018]
The corrugated partition wall corner reinforcing structure 31 constituted by the corrugated partition wall corner welding method according to the embodiment of the present invention has a carbon dioxide arc welding at the contact portion between the corrugated partition wall corner 9 and the tank top 5. Are provided with weld beads (welded metal) 11, 11,... By carbon dioxide arc welding using an apparatus, and the surface of the weld bead 11 is formed into a predetermined shape Q with a grinder, A predetermined region Au on the corrugated partition wall (corrugated longitudinal partition wall or corrugated horizontal partition wall) 7 side of the molding surface of the fixing portion 33 and a predetermined region Ad on the tank top 7 side of the fixing portion 33 are formed by a TIG welding apparatus. A reinforcing portion 35 formed at a predetermined flank angle by TIG welding is provided.
[0019]
Further, in the corrugated partition wall corner reinforcement structure 31 according to the present embodiment, the predetermined shape is formed with a flank angle of approximately 45 degrees with respect to the tank top 7.
Here, the explanation of the TIG welding apparatus is simplified. TIG welding equipment is equipped with a conductor inside a cylindrical gas nozzle, a non-consumable electrode is provided at the center of the conductor, and argon gas can be sprayed from between the gas nozzle and the conductor toward the welded part. It is the device which was made. The TIG welding by this TIG welding apparatus belongs to the category of shield gas arc welding as in the case of carbon dioxide arc welding.
[0020]
In this TIG welding apparatus, when welding a member to be welded (for example, corrugated partition wall 7) to a base material (for example, tank top 5), a separately provided filler material is used, and this base material is melted by melting the filler material. A member to be welded (for example, corrugated partition wall 7) is welded to (for example, tank top 5). At this time, from the gas nozzle, an inert gas mainly composed of argon gas is sprayed as a shielding gas toward the welded portion to shield the welded portion from the space, and the non-consumable electrode is brought close to the filler material to remove the filler material. It is melted during welding so that a beat is formed between the base material (for example, tank top 5) and the member to be welded (for example, corrugated partition wall 7), so that the beat shape is flat and the welding does not generate spatter. It is a thing.
[0021]
Using such a TIG welding apparatus, the angle of the surface of the weld bead formed by the TIG welding apparatus is set to be, for example, 60 [degrees] or less in the region Au. Similarly, using the TIG welding device, the surface M of the weld bead formed by the TIG welding device is set to 50 degrees or less in the region Ad.
[0022]
Such a reinforcing structure 31 for the corrugated partition wall corner is formed by a welding method for the corner of the corrugated partition shown in FIG. FIG. 2 is a flowchart for explaining a method of manufacturing a reinforcing structure for corrugated partition wall corners according to an embodiment of the present invention.
In FIG. 2, in the first step, carbon dioxide arc welding is performed on a contact portion between a corner portion 9 of a corrugated partition wall (corrugated longitudinal partition wall or corrugated horizontal partition wall) 7 and the tank top 5 by a carbon dioxide arc welding apparatus. A weld metal (bead) 11, 11,... Is provided at the contact portion (S101).
[0023]
Next, in the second step (molding step), the surface of the weld metal (bead) 11, 11,... Is formed into a predetermined shape Q using a grinder (S102).
Further, in the third step, a predetermined area Au on the corrugated partition wall (corrugated longitudinal partition wall or corrugated horizontal partition wall) 7 side of the molding surface of the fixed portion 33 and a predetermined area on the tank top 5 side of the fixed portion 33 are formed. The region Ad is welded by TIG welding with a TIG welding apparatus to provide a reinforcing portion 35 (S103).
In the second step (the step of forming the predetermined shape), the weld metal (beads) 11, 11,... Are polished with a grinder so as to form approximately 45 degrees with respect to the tank top 5 surface. To.
[0024]
FIG. 3 is a diagram showing a model of the reinforcing structure of the corrugated partition wall corner formed by the method of welding the corner of the corrugated partition according to the embodiment of the present invention. In FIG. 1, a corrugated partition wall corner reinforcement structure model 60 is formed on a welded member J (in this specification, with respect to the front and back surfaces of a base material M (described in this specification as, for example, the tank top 5)). For example, the corrugated partition wall 7) is welded to the same structure as the corrugated partition wall corner reinforcing structure 31 by the above-described corrugated partition wall corner welding method.
Each of the welded members J of the corrugated partition wall corner reinforcement structure model 60 having such a corrugated partition wall corner reinforcement structure 31 was sandwiched between test stands 71 and 71 of a fatigue tester, and a fatigue test was performed.
[0025]
FIG. 4 shows a plurality of models of the reinforcing structure of the corrugated partition wall corner portion formed in the same structure as the corrugated partition wall corner reinforcing structure 31 described above and other reinforcing structure models having other structures. It is a figure which shows the fatigue test result which tested the structural model with the fatigue testing machine, The number of repetition [times] is taken on a horizontal axis, and stress amplitude [kg / mm < 2 >] is taken on the vertical axis | shaft, respectively.
In FIG. 4, the test piece (ASWELD (45 [degrees]) and the test piece TIG finish (45 [degrees]) were subjected to 1.E + 04 to 1.E + 07 [times] repeated tests using a test apparatus. The results of the test are as follows: That is, the test piece (ASWELD (45 [degrees])) was only subjected to carbon dioxide arc welding, and the fatigue test was performed when the angle between the tank top 7 and the finished surface was θ = 45 [degrees]. It is a result.
[0026]
The test piece (TIG (45 [degrees])) was carbon dioxide arc welded and further TIG welded to have a structure similar to the reinforcing structure 31 of the corrugated partition wall corner, and the angle θ = 45 between the tank top 7 and the finished surface. When it is [degree], it is a fatigue test result.
Table 1 summarizes these results.
[0027]
[Table 1]
Figure 2005014001
[0028]
As can be seen from Table 1, in the case of the test piece (ASWELD (45 [degrees]), the fatigue life ratio is 1.00.
Moreover, in the case of a test piece (TIG (45 [degrees])), it turns out that fatigue life ratio is 5.93.
[0029]
FIG. 4 shows a model of the reinforcing structure of the corrugated partition wall corner portion formed in the same structure as the reinforcing structure 31 of the corrugated partition wall portion described above, and a test piece formed in the surface finish shape closest to this with a fatigue tester. It is a figure which shows the fatigue test result tested, The horizontal axis represents the number of repetitions [times], and the vertical axis represents the stress amplitude [kg / mm 2 ].
[0030]
According to the test results shown in FIG. 4, the ratio of the test piece (ASWELD (45 [degrees]) to the fatigue life test piece (TIG (45 [degrees])) depending on the shape of the weld bead 19 at the corner 17 of the corrugated partition wall ( 5.93 / 1.00) was found to have a difference of about 6 times at the maximum.Therefore, it is necessary to pay sufficient attention to the predetermined shape of the corner portion 17 of the corrugated partition wall which becomes the high stress portion, It can be seen that the corrugated partition wall corner reinforcing structure 31 formed by the method of welding the corrugated partition wall corner according to the embodiment of the present invention exhibits the most excellent performance.
[0031]
As described above, according to the corrugated partition wall corner portion reinforcing structure 31 formed by the method of welding the corrugated partition wall corner portion according to the embodiment of the present invention, the corner portion 9 of the corrugated partition wall 7 is contacted with the tank top 5. The contact portion is carbon dioxide arc welded by a carbon dioxide arc welding apparatus to provide weld beads (welded metal) 11, 11,... At the contact portion, and the surfaces of the weld beads 11, 11,. A fixed portion 33 formed by molding, a predetermined area Au on the corrugated partition wall (corrugated longitudinal partition wall or corrugated horizontal partition wall) side of the molding surface of the fixed portion 33, and a predetermined region on the tank top 5 side of the fixed portion 33. Since the region Ad is Tig welded by a TIG welding apparatus and the reinforcing portion 35 formed at a predetermined angle is provided, the fatigue life is increased, and the region Ad is enlarged as a corrugated longitudinal partition wall or a corrugated horizontal partition wall. May be unsubstituted partition walls is sufficiently secured, it is possible to prevent the occurrence of cracks.
[0032]
【The invention's effect】
As described above, according to the present invention, the contact portion between the corner portion of the corrugated partition wall and the tank top is carbon dioxide arc welded to provide a weld bead at the contact portion, and the surface of the weld bead has a predetermined shape. Molded and formed at a predetermined angle by TIG welding a predetermined region on the corrugated partition wall side of the molding surface of the fixed part and a predetermined region on the tank top side of the fixed part, the fatigue life becomes long, Even a partition wall that bends greatly, such as a corrugated partition wall, is sufficiently fixed and can prevent the occurrence of cracks.
[Brief description of the drawings]
FIG. 1 is a view showing a corrugated partition wall corner reinforcing structure formed by a method for welding corrugated partition wall corners according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining a method of welding a corner portion of a corrugated partition according to an embodiment of the present invention.
FIG. 3 is a view showing a model of a reinforcing structure of a corrugated partition wall corner formed by the method of welding the corner of the corrugated partition according to the embodiment of the present invention.
FIG. 4 shows a model of a reinforcing structure for corrugated partition wall corners having the same structure as that of a corrugated partition wall corner formed by the welding method for corrugated partition walls according to an embodiment of the present invention. It is a figure which shows the fatigue test result tested.
FIG. 5 is a perspective view showing a part of a corrugated partition wall forming a tanker tank.
FIG. 6 is a view showing a state of a corner portion when the corrugated partition wall described above is welded to the tank top by the carbon dioxide arc welding apparatus.
FIG. 7 is a view showing a state in which the weld metal at the welded portion of the corrugated partition wall corner is surface-finished with a grinder.
FIG. 8 is a diagram showing stress distribution at each position of the partition including the corrugated partition corner and the partition including the corner.
1 tanker 3 tank 5 tank top 7 corrugated partition wall 9 corner 11 weld metal (bead)
31 Reinforcing structure of corrugated partition wall corner portion 33 fixing portion 35 reinforcing portion

Claims (2)

タンカーの船倉を区切る波形隔壁のコーナー部の溶接方法であって、
波形隔壁のコーナー部とタンクトップとの当接部分を炭酸ガスアーク溶接によって溶接して当該当接部分に溶接ビードを形成する工程と、
当該溶接ビード表面を所定の形状に成形してなる成形工程と、
前記溶接ビートの成形面の波形隔壁側の所定の領域と、前記固定部のタンクトップ側の所定の領域とをティグ溶接で溶接して補強部を形成する工程とを備えことを特徴とする波形隔壁のコーナー部の溶接方法。A welding method for a corner portion of a corrugated bulkhead separating tanker holds,
Welding the contact portion between the corner portion of the corrugated partition wall and the tank top by carbon dioxide arc welding to form a weld bead on the contact portion;
A molding step in which the surface of the weld bead is molded into a predetermined shape;
And a step of welding a predetermined region on the corrugated partition wall side of the molding surface of the welding beat and a predetermined region on the tank top side of the fixed portion by TIG welding to form a reinforcing portion. Welding method for corners of partition walls. 前記所定の形状を形成する工程は、前記溶接ビードをグラインダで研磨してタンクトップ面に対して概ね４５度に形成されていることを特徴とする請求項１記載の波形隔壁コーナー部の補強構造の製造方法。2. The corrugated partition wall corner reinforcing structure according to claim 1, wherein the step of forming the predetermined shape is formed at approximately 45 degrees with respect to the tank top surface by polishing the weld bead with a grinder. Manufacturing method.
JP2003178188A 2003-06-23 2003-06-23 Welding method for the lower end of corrugated bulkhead Expired - Lifetime JP3808061B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100445011C (en) * 2006-08-07 2008-12-24 新疆石油工程建设有限责任公司 Electrogas arc welding method for vertical line of large-scale floating roof tank reverse construction
ES2370477A1 (en) * 2009-12-23 2011-12-16 Asociación De Investigación Metalúrgica Del Noroeste - Aimen Automatic equipment for the welding of corrugated ship mamps. (Machine-translation by Google Translate, not legally binding)
CN105195858A (en) * 2015-10-27 2015-12-30 武昌船舶重工集团有限公司 Flat-angle welding method for hull structural steel
CN105252108A (en) * 2015-10-27 2016-01-20 武昌船舶重工集团有限公司 Flat overhead corner joint welding method for steel for ship structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105195873B (en) * 2015-10-27 2018-07-03 武昌船舶重工集团有限公司 A kind of steel for ship structure founds corner connection welding method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100445011C (en) * 2006-08-07 2008-12-24 新疆石油工程建设有限责任公司 Electrogas arc welding method for vertical line of large-scale floating roof tank reverse construction
ES2370477A1 (en) * 2009-12-23 2011-12-16 Asociación De Investigación Metalúrgica Del Noroeste - Aimen Automatic equipment for the welding of corrugated ship mamps. (Machine-translation by Google Translate, not legally binding)
CN105195858A (en) * 2015-10-27 2015-12-30 武昌船舶重工集团有限公司 Flat-angle welding method for hull structural steel
CN105252108A (en) * 2015-10-27 2016-01-20 武昌船舶重工集团有限公司 Flat overhead corner joint welding method for steel for ship structure
CN105195858B (en) * 2015-10-27 2017-10-27 武昌船舶重工集团有限公司 A kind of steel for ship structure straight angle connects welding method

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