FARAG A. Soul Elmergib University

The contribution of welding science with sheet metal forming is interesting factor for industrial progress by alternating other complicated and machining process. Today to increase strength to weight ratio welding of thin sheet element is widely use for different application from civil to military technologies. Welding induced residual stresses can attributed to induce brittle fracturing, stress corrosion cracking and degrade the buckling strength of thin element welded structures. Different mitigating techniques may be effectively used to minimize residual stress in welded structures. In this paper focused on the study of numerically predicted results of temperature distribution and residual stress field developed during the conventional welding process and after enhancing with trailing heat sink technique applied on 2024-T4 aluminum alloy. By introducing the moving cooling spot, temperature contours were modified or new temperature topography obtained. At optimum distance between the two sources the transient residual stresses behavior significantly changes, the longitudinal residual stress was minimized and deformation may disappear.

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