Rotary peening
Rotary peening introduces compressive residual stresses into complex components using rotating carbide-tipped pins. This improves strength and toughness.
Physical-chemical mechanism of action
Rotary peening uses rotating pins with hard metal to selectively introduce compressive residual stresses into the material. The rotation and contact of the pin with the workpiece cause microscopic deformations that affect the crystal structure.
Metallurgical relevance & risks in welding
The generation of compressive residual stresses increases the strength and toughness of the material. This can be especially helpful in hard-to-reach geometries or complex components. However, an incorrectly applied rotary peening process can cause overstressing of the material, leading to cracks or distortion.
Workshop practice & instructions for action
To apply rotary peening successfully, it is important to choose the right pin size and speed. A regulation of 100-200 rpm for the pin and a compressive stress of 50-100 N/cm² is common. It is also crucial that the workpiece is dry and clean to ensure uniform deformation.