Mechanical Behavior during SR-treatment of Welding Residual Stress Through the Thickness(Mechanics, Strength & Structural Design)

概要

論文の詳細を見る
Welding residual stress often makes deteriorate quality of the welded joint. So, PWHT (post weld heat treatment) is usually carried out for the purpose of relaxation of welding residual stress and softening of the welded joint. In this paper, the mechanical behavior during SR (stress relief annealing), which is the most popular treatment among the PWHT, is elucidated based on the results of three-dimensional thermo-elasto-plasto-creep analysis. The main results are as follows: According to the results of three-dimensional creep analysis, at the early stage during SR-treatment, creep strain tends to be easily accumulated in weld metal and HAZ (heat affected zone). Therefore, stress relaxation is considerable in weld metal and HAZ. Welding residual stress is mainly relaxed in the heating stage. The configuration of the stress distribution does not change and plastic strain is not produced during SR-treatment. Predicting creep strain and stress during and after SR-treatment from the results of two-dimensional plane-deformation thermo-elasto-plasto-creep analysis, the accuracy depends upon how actually represents the distribution and the magnitude of welding residual stress, which is one of the mechanical measures represented the severity of mechanical condition. If the stress concentration such as a notch, defects of welding etc. exists in parallel with weld line, the accumulation of the creep strain component perpendicular to a notch becomes great, but the stress component in the same direction is hard to be relaxed. Then, in the case that the characteristic of stress relaxation is inferior in base metal, though creep strain is greatly accumulated in weld metal and HAZ, the stress component perpendicular to weld line is hard to be relaxed.
大阪大学の論文

Mechanical Behavior during SR-treatment of Welding Residual Stress Through the Thickness(Mechanics, Strength & Structural Design)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク