FEM Analysis of 3-D Welding Residual Stresses and Angular Distortion in T-type Fillet Welds(Mechanics, Strength & Structural Design)

概要

論文の詳細を見る
In this paper, the residual stresses in T-type fillet welds are computed by thermal elastic plastic three dimenional FEM and generalized plane strain FEM. Then the residual stresses and their distribution patterns in single pass and multipass T-type fillet welded joints are clarified. From the analyzed results, it is observed that a large tensile transverse residual stress is produced near the fillet toe, which has a very detrimental effect on fatigue cracking. The tensile transverse residual stress near a multipass fillet weld toe is larger than that near the single pass fillet weld toes, and it is mainly induced by the two welding passes close to the fillet toe. Furthermore, the effects of welding sequence, welding penetration, heat input, plate thickness and restraint conditions on the tensile transverse residual stress are investigated. With increasing welding heat input or penetration, the tensile transverse residual stress decreases. With increasing flange thickness, the tensile transverse residual stress increases. When the flange is restrained during welding and the restraint force is released after welding, the tensile transverse residual stress near the fillet toe can be reduced. In the last section, the angular distortion in T-type fillet welds is computed by generalized plane strain FEM, and the effect of the welding sequence, the support of working table and the applied external restraint position are investigated
大阪大学の論文