片面自動溶接による突合せ溶接継手の終端割れの防止について

概要

論文の詳細を見る
In shipyard panel-production lines, several steel plates are butt-welded to form large panels using one-side automatic welding process. A troublesome problem is the tendency of hot cracking appeared in the end portion of the butt-weld. In this paper, firstly the nominal susceptibility of the end cracking is investigated experimentally for the actual butt-welded joints. The critical displacement increment for the occurrence of the end cracking is evaluated for the various welding conditions and the influence of displacement rate on the formation of hot cracks is discussed. Secondly, the displacement increment produced by the unit force per unit thickness applied at the end of welded plate is estimated by use of the finite element method taking the temperature dependency of elastic modulus and the change of dimensions of tab plate attached to the finish end of the welded joint into consideration. Finally, the relationship between the size of the end tack weld closely related to the magnitude of tearing force acting on it and the dimensions of the end tab plate required to prevent the end cracking is presented and a practical way to avoid the end cracking in one-side automatic welding process is proposed.
社団法人日本船舶海洋工学会の論文
1985-03-22