Butt Joining Of Sheet By Shot Peening

Author:  Harada, Fukaura, Yamamoto, Ujihashi, Kobayashi
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008042
Year of Publication:  2008
Abstract:  
ABSTRACT The ability of shot peening to enhance butt joining of the dissimilar sheets was investigated. In shot peening, the substrate undergoes a large plastic deformation near its surface when hit by many shots. When the machined part with the bore and the groove is excessively shot peened, the accuracy of the shape is lowered as the amount of plastic flow increases. This plastic flow is characterized by a shear droop at the edge of the substrate, i.e., the peened material overflows at the edge. When the dissimilar sheets with the notched edges are connected without a level difference and then the connection is shot peened, the sheets can be joined by the plastic flow generated by the large plastic deformation during shot peening. In this experiment, an air-type peening machine was used. The influences of processing conditions on the joinability were examined. Tensile tests were performed to evaluate joint strengths. The joint strength increased with air pressure, i.e., the amount of plastic flow. It was found that the present method can be used to enhance the butt joining of the dissimilar sheets. KEY WORDS Joining, Plastic flow, Joinability, Sheet