Ways for increasing efficiency of an electrohydropulse method for removing residual stress in welded joints

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Ways for increasing efficiency of an electrohydropulse method for removing residual stress in welded joints

Vovcenko, A.I. / Demidenko, L.J. / Jurcenko, E.S.

To avoid the corrosive destruction of welded joints in aggresive media (particularly by hydrgen cracking), an electrohydropulse treatment of weld surfaces was recommended. The reduction of macrostress and stabilization of the dislocational structure (under decreased dislocation density) takes place without any hazard of occurrence of new stresses as generated during the thermal treatment. An analysis of processes in the discharge channel-welded joint system was a base for improving technological treatment schemes for large-sized pressure tanks and pipelines. A two-electrode system was used for the discharge-generating elastic counter-current pressure pulses in the material treated for an intensive relaxation of the existing residual stresses. An interference of the pulse waves (7.5 kJ) was assumed and observed in welded steel samples. The initial stresses (220 MPa) were reduced by 41 % to 45 % in the two-electrode system.