Abstract
A manufacturing process that can be used to join two or more steels by welding. This process involves an uneven distribution of heat which causes residual stresses to occur. Residual stresses in the material, even though the external forces acting have been removed in the local heat distribution area in plastic deformation. Residual stress has a significant relationship with material exhaustion. Tensile residual stress (TRS) can reduce fatigue life, while compressive residual stress (CRS) will increase fatigue life. CRS makes the stress received by the material lower, resulting in a more expansive Fatigue Crack Propagation (FCP) area and a much smaller final fracture cross-section. Materials with CRS have a higher fatigue life than materials without CRS. Fatigue resistance can be increased by reducing the residual stress in tension. Currently one method that is widely used to increase fatigue resistance is shot peening. Shot peening provides CRS on the surface so that crack initiation originates below the surface of the material causing an increase in fatigue resistance.
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