The governing equations of surface-deformation in fully-penetrated GTAW weld pool are derived. The solution scheme of the Lagrange multiplier, which makes the top surface-deformation equation be coupled with that for ...The governing equations of surface-deformation in fully-penetrated GTAW weld pool are derived. The solution scheme of the Lagrange multiplier, which makes the top surface-deformation equation be coupled with that for the bottomsurface of a single weld pool, is given out. Through numerical analysis of weld pool surface-deformation in GTA W, it is found that there is clear correlation between the penetration extent and the Lagrange multiplier, in addition to the relationship between the penetration extent and the maximum depression and hump as well as the depressed volume of the top surface of weld pool. It lays good foundation for top-side sensing based weld penetration control.展开更多
基金the National Natural Science Foundation of China under Grant No50475131
文摘The governing equations of surface-deformation in fully-penetrated GTAW weld pool are derived. The solution scheme of the Lagrange multiplier, which makes the top surface-deformation equation be coupled with that for the bottomsurface of a single weld pool, is given out. Through numerical analysis of weld pool surface-deformation in GTA W, it is found that there is clear correlation between the penetration extent and the Lagrange multiplier, in addition to the relationship between the penetration extent and the maximum depression and hump as well as the depressed volume of the top surface of weld pool. It lays good foundation for top-side sensing based weld penetration control.
