Effect of Peening Operation on the Notch Toughness

Abstract

It is evident that the stress-peak can be relieved by peening operation, but this operation inevitubly produces the plastic deformation at the peened position and increases the hardness of its part.
In this report we examined how peening operation affects the welded joint, especially, the notch toughness; and cohfirmed that this operation on the deposit metal was out of problem, but peening on the parent metal near the weld deposit was harmful from the point of notch toughness.