High-Frequency Mechanical Peening
High-frequency peening is a process to improve the surface layer structure of welded areas through rapid, targeted impacts. It reduces fatigue and increases the service life of components.
Physicochemical Mechanism of Action
High-frequency peening generates mechanical stresses in the surface layer of the welded material through rapid impacts. These stresses cause microscopic deformations and reformation of the crystal structure, which increases strength.
Metallurgical Relevance & Welding Risks
The process improves the mechanical toughness and fatigue behavior of the surface layer, reduces susceptibility to cracking, and increases the service life of components. However, improper application or excessive peening stresses can lead to surface damage or excessive stress states, which in turn increases the risk of cracking.
Workshop Practice & Instructions
Use a high-frequency peening system with a frequency of at least 10 kHz. The peening stress should be between 5 and 20 N, depending on the material and component size. Operate the process for 30 to 60 seconds per spot to achieve the desired improvement. Make sure the surface layer is clean and free of dirt particles, as these can cause damage.