On the Study of Restraint and Residual Stress due to Welding on Erecting Butt Joint of Ship's Hull (Report No. 4) Investigation about the restraint

Masataro Muto; Takatoshi Kurita; Yukio Kurihara

doi:10.2534/jjasnaoe1952.1962.263

船体構造における突合せ溶接継手の拘束と残留応力に関する研究 (第4報)

大型油槽船のブロック継手の拘束に関する検討

武藤昌太郎, 栗田剛利, 栗原幸雄

著者情報

ジャーナルフリー

1962 年 1962 巻 111 号 p. 263-272

DOI https://doi.org/10.2534/jjasnaoe1952.1962.263

詳細

発行日: 1962 年受付日: 1961/12/19 J-STAGE公開日: 2009/01/08 受理日: - 早期公開日: - 改訂日: -
訂正情報
訂正日: 2009/01/08 訂正理由: - 訂正箇所: 論文タイトル訂正内容: 訂正前 : 船体構造における突合せ溶接継手の拘束と殘留応力に関する研究(第4報)
訂正後 : 船体構造における突合せ溶接継手の拘束と残留応力に関する研究 (第4報)

訂正日: 2009/01/08 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : In Report No.3, we showed that there was no remarkable difference between the reaction stress in way of master butt, which concerns with residual stress and intensity of restraint, and reaction stress in common butt, from the actual ship experiment on oil tanker “Andros Tanker”, 41, 000 D. W. This result seems to be unnatural, because it is considered that the condition of restraint to common block butt and master butt are obviously different. To solve this problem, further experiment was carried out on the other ship of 73, 000 D. W. oil tanker.
First, the mechanical force was applied to upper deck block twice, firstly as erected and lastly before welding, in order to observe the block behaviour. This experiment was conducted to find the fundamental relationship between the displacement of block and the external force. Next, we compared thus obtained actual result with a presumed curve which can be drawn by considering the ideal case in which there exist no other than block friction.
Through the above experiment, in actual ship, it is found as follows:
(1) The outer force which is sufficient to keep the newly erected block moving increases slowly until the block butts contact, and after rapidly. It should be pointed out, however, that the displacement of block is taken place by considerably smaller force than that expected in consideration of elastic deformation of block. It is considered that this fact is due to the dislocation or destruction of root face at the block butt.
(2) Comparing the displacement of block at common block butt with at master butt, rigid block motion takes place at the former, while it does not at the latter.
(3) The difference of reaction stress between common block butt and master butt is less than 2kg/mm² which agrees with the result in Report No.3. It follows from the above that it is not the rigid body motion of block that govern the residual stress, but the degree of the self-restraint of weld in connection with thermal effected zone.
(4) Thus, it is concluded that master butt under the Method of Erection Started Simultaneously at Several Locations, as is used in this ship yard may be treated quite in the same way as in the case of common block butt, provided that master butt weld properly carried out, for example adopting the method of simultaneous weld by many welders.
Right : In Report No. 3, we showed that there was no remarkable difference between the reaction stress in way of master butt, which concerns with residual stress and intensity of restraint, and reaction stress in common butt, from the actual ship experiment on oil tanker “Andros Tanker”, 41, 000 D. W. This result seems to be unnatural, because it is considered that the condition of restraint to common block butt and master butt are obviously different. To solve this problem, further experiment was carried out on the other ship of 73, 000 D. W. oil tanker.
First, the mechanical force was applied to upper deck block twice, firstly as erected and lastly before welding, in order to observe the block behaviour. This experiment was conducted to find the fundamental relationship between the displacement of block and the external force. Next, we compared thus obtained actual result with a presumed curve which can be drawn by considering the ideal case in which there exist no other than block friction.
Through the above experiment, in actual ship, it is found as follows :
(1) The outer force which is sufficient to keep the newly erected block moving increases slowly until the block butts contact, and after rapidly. It should be pointed out, however, that the displacement of block is taken place by considerably smaller force than that expected in consideration of elastic deformation of block. It is considered that this fact is due to the dislocation or destruction of root face at the block butt.
(2) Comparing the displacement of block at common block butt with at master butt, rigid block motion takes place at the former, while it does not at the latter.
(3) The difference of reaction stress between common block butt and master butt is less than 2 kg/mm² which agrees with the result in Report No. 3. It follows from the above that it is not the rigid body motion of block that govern the residual stress, but the degree of the self-restraint of weld in connection with thermal effected zone.
(4) Thus, it is concluded that master butt under the Method of Erection Started Simultaneously at Several Locations, as is used in this ship yard may be treated quite in the same way as in the case of common block butt, provided that master butt weld properly carried out, for example adopting the method of simultaneous weld by many welders.

訂正日: 2009/01/08 訂正理由: - 訂正箇所: 引用文献情報訂正内容: 訂正前 : (1) 武藤昌太郎,栗田剛利,栗原幸雄, “船体構造における突合せ継手の拘束と残留応力に関する研究(第3報)-多点建造におけるブロック継手の拘束度と残留応力について”造船協会論文集,第107号, 1960年7月, p. 227～286。
(2) 佐藤邦彦“溶接継手の拘束度および拘束応力に関する最近の研究”溶接学会誌,第30巻,第4号, 1961年4月, p. 212～218。
(3) 渡辺正紀,佐藤邦彦,高木乙彦,麻生文太郎“船体ブロック溶接継手の拘束度ならびに収縮”造船協会論文集,第104号, 1959年1月, p. 191～200。
(4) 国安常雄,鬼塚則義“中型船マスターバット継手建造法における拘束度および残留応力について”造船協会論文集,第104号, 1959年, 1月, p. 275～290。
(5) 吉田免四郎,阿部武,尾上久浩, “船体構造における突合せ溶接継手の拘束と残留応力に関する研究”第1報および第2報　造船協会論文集第106号1960年1月p. 223～227およびp. 239～247.

訂正後 : (1) 武藤昌太郎, 栗田剛利, 栗原幸雄, “船体構造における突合せ継手の拘束と残留応力に関する研究 (第3報) -多点建造におけるブロック継手の拘束度と残留応力について” 造船協会論文集, 第107号, 1960年7月, p.227-286.
(2) 佐藤邦彦 “溶接継手の拘束度および拘束応力に関する最近の研究” 溶接学会誌, 第30巻, 第4号, 1961年4月, p.212-218.
(3) 渡辺正紀, 佐藤邦彦, 高木乙彦, 麻生文太郎 “船体ブロック溶接継手の拘束度ならびに収縮” 造船協会論文集, 第104号, 1959年1月, p.191-200.
(4) 国安常雄, 鬼塚則義 “中型船マスターバット継手建造法における拘束度および残留応力について”造船協会論文集, 第104号, 1959年, 1月, p.275-290.
(5) 吉田免四郎, 阿部武, 尾上久浩, “船体構造における突合せ溶接継手の拘束と残留応力に関する研究”第1報および第2報造船協会論文集第106号1960年1月p.223-227およびp.239-247.

訂正日: 2009/01/08 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

In Report No. 3, we showed that there was no remarkable difference between the reaction stress in way of master butt, which concerns with residual stress and intensity of restraint, and reaction stress in common butt, from the actual ship experiment on oil tanker “Andros Tanker”, 41, 000 D. W. This result seems to be unnatural, because it is considered that the condition of restraint to common block butt and master butt are obviously different. To solve this problem, further experiment was carried out on the other ship of 73, 000 D. W. oil tanker.
First, the mechanical force was applied to upper deck block twice, firstly as erected and lastly before welding, in order to observe the block behaviour. This experiment was conducted to find the fundamental relationship between the displacement of block and the external force. Next, we compared thus obtained actual result with a presumed curve which can be drawn by considering the ideal case in which there exist no other than block friction.
Through the above experiment, in actual ship, it is found as follows :
(1) The outer force which is sufficient to keep the newly erected block moving increases slowly until the block butts contact, and after rapidly. It should be pointed out, however, that the displacement of block is taken place by considerably smaller force than that expected in consideration of elastic deformation of block. It is considered that this fact is due to the dislocation or destruction of root face at the block butt.
(2) Comparing the displacement of block at common block butt with at master butt, rigid block motion takes place at the former, while it does not at the latter.
(3) The difference of reaction stress between common block butt and master butt is less than 2 kg/mm² which agrees with the result in Report No. 3. It follows from the above that it is not the rigid body motion of block that govern the residual stress, but the degree of the self-restraint of weld in connection with thermal effected zone.
(4) Thus, it is concluded that master butt under the Method of Erection Started Simultaneously at Several Locations, as is used in this ship yard may be treated quite in the same way as in the case of common block butt, provided that master butt weld properly carried out, for example adopting the method of simultaneous weld by many welders.

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