平板の突合せ溶接進行中におけるグルーブ間隙の変化について : 第 2 報熱源前方に拘束を有する場合

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This paper deals with the effect of welding conditions and a restraint pitch on changes of root gap during welding in case of butt weld joints with restraint. The calculations of changes of root gap during welding are carried out under various conditions of heat input and restraint pitch. In this case it is assumed that the rigidity of restraint is infinite. The main conclusions obtained in this report are summarized as follows : (1) In case of butt weld joints with restraint under the condition of relative small restraint pitch, a root gap closes in any welding condition. (2) The root gap closes largest between the weld start position and the first restraint position during welding. (3) When the moving distance of heat source become large, the displacement at heat source u_H pulsates with a constant amplitude. In this case the maximum closing displacement u^^-_H occures when the heat source passes the restraint position. The maximum closing displacement u^^-_H in this quasi-stationary state is constant even if the restraint pitch is changed. The maximum closing displacement u^^-_H is approximately expressed by the following equation. [numerical formula] (4) The maximum closing displacement between the weld start position and the first restraint position is expressed by the following equation. [numerical formula] (5) It is sufficient to make the restraint pitch short only in the neighborhood of weld start position in order to decrease the maximum closing displacement during welding.
社団法人溶接学会の論文
1980-10-05

平板の突合せ溶接進行中におけるグルーブ間隙の変化について : 第 2 報熱源前方に拘束を有する場合

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