ELECTROCHEMICAL METHOD TO REMOVE DIFFUSIVE HYDROGEN TO MITIGATE OR REMOVE THE SUSCEPTIBILITY OF HYDROGEN INDUCED CRACKING ON THE WELD PORTION OF WELDED STRUCTURE

摘要

electrochemical treatment to remove the diffusible hydrogen penetrated the welding structure according to the present invention, welding In the electrochemical treatment to remove the diffusible hydrogen permeation is to alleviate or eliminate the hydrogen cracking caused due to the diffusible hydrogen in the weld penetration of the structure, the corrosion in the welded portion during the removal of the diffusible hydrogen order to prevent the occurrence, after creating the potential is applied to the weld zone with an aqueous solution to form a passivating environment for the passive film forming step of forming a passive film on the surface of the weld zone; And oxidizing the diffusible hydrogen in the weld zone in order to remove the permeation from the welding portion, more than the passivation potential range of the hydrogen equilibrium potential for forming the film and the passivation film is destroyed formula (pitting) occurs in the weld start formula characterized by comprising; a potential less than the potential applied step voltage is applied to the passivation film formed on the welded part. Accordingly, to mitigate the hydrogen cracking caused due to the diffusible hydrogen in the weld penetration in a short time or eliminated, preventing the excessive cost required for the heat treatment after welding, and after completion of addition, nuclear power plant bead tempering (temper bead) Maintenance by reducing or removing the non-destructive testing of welds waiting time it is possible to prevent the production and construction and operation of nuclear power utilization decreased Delay of new nuclear power plants.