Prevention Of Stress Corrosion Cracking Of Weldment By Wet Shot Peening

Author:  Takemoto, Shinohara, Shirai,
Source:  Conf Proc: ICSP-2, (p. 39-42)
Doc ID:  1984053
Year of Publication:  1984
Abstract:  
In order to prevent stress Corrosion Cracking (SCC) of austenitic stainless steel equipment, a Wet Shot Peening method which was able to convert tensile residual stresses to compressive stresses during and/or after welding was developed. In the Wet Shot Peening (WSP), glass beads were injected to member surface with water jet pressurized by high speed centrifugal slurry pump. WSP made it possible to peen the tower and vessel in chemical plant continuously without meeting the problems which were experienced in adopting conventional air-blast type shot peening. Effect of WSP on residual stresses, surface roughness, metallurgical changes, removability of scale and deposits were investigated in our laboratory. Two examples of application of this method to chemical process equipment are discussed. Descriptors: Wet shot peening; Stress corrosion cracking; Shot peening; Heat sink welding; Weld scale; Austenitic stainless steel