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The effectiveness of applying vibratory stress relief to controlling deformations due to internal stresses on plates pro-duced by welding was evaluated in this research. The magnitude of distortion produced in three groups of specimens which had been treated with vibration during and after welding was also evaluated. The specimens consisted of aus-tenitic stainless steel plates which tend to become deformed due to high expansion and shrinkage coefficient and low thermal conductivity during arc welding. Their deformation was quantified by measuring the vertical distance which the end of the plate moved after the welding bead was applied. The magnitude of stress produced by the effect of vi-bration was measured too. The results revealed a clear reduction of the final deformation in treated specimens com-pared to non-treated ones. It was also found that the magnitude of stress produced during vibration had no impor-tant effect on the treatment’s effectiveness.