In the present report, the authors studied experimentally with small test pieces in constraint the effects of peening on the stress relieving of the welded joints to find the most effective peening operations. The results obtained are as follows:
(1) Peening the deposit metal and parent metal near the welded line after the welded joints cooled to room temperature is most effective for the purpose of stress relieving.
(2) Peening operation on the last layer is most effective for stress relieving, in comparison to the each layer peening.
(3) For the purpose of stress relieving, it will be enough, from the practical point of view, to apply peening to the last layer only.
(4) Peening on the parent metal, besides the deposit metal, is effective for the relieving of the residual stress lyieg transverse to the welded line.
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