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There are several ways to relieve welding residual stresses. The most commonly used and the only standardized method is the post-weld heat treatment. However, this method is time-consuming and costly, which necessitates exploring other approaches that can ensure satisfactory results in a faster and more economical manner. In this context, the industry has gradually adopted relief of residual stresses through vibration. Therefore, this study aims to relieve welding residual stresses in thick plates to evaluate whether the position of the excitation source, whether parallel or coincident with the welded plates, influences the expected results. Additionally, it seeks to determine whether the best results are obtained when vibration stress relief is performed simultaneously with welding or after the completion of the process. It was verified that the parallel position presented a maximum reduction of 63.7% in residual stresses when performed after welding, while the parallel and coincident position during the welding reduced a maximum of 2.5% and 56.0% of residual stresses, respectively. Furthermore, mechanical tests are conducted to determine the influence of these processes on mechanical properties. The results indicated that performed vibration after welding is more efficient, and the vibration motor's position significantly influences the results. Furthermore, it was observed that the only impacted toughness without altering significant other mechanical properties. [ABSTRACT FROM AUTHOR]