Anwendung eines hochfrequenten Hämmerverfahrens zur Optimierung von geschweißten Motorbauteilen bei MAN Diesel SE

Implementation of high-frequent hammer-peening as an optimisation step for welded engine components at MAN Diesel SE.

The high-frequent hammer-peening called HiFIT (high frequency impact treatment) was introduced successfully at MAN Diesel SE. As an essential step, a new fatigue assessment procedure based on fracture mechanics was developed. On one hand, the after-treatment procedure was used in the design phase of an oil pan to achieve sufficient safety factors against fatigue fracture. On the other hand, it was adopted in an existing design of a foundation frame because in-situ measurements have revealed the need for improvement. This paper represents the both examples of application. In both cases, the fatigue requirements have been fulfilled with the high-frequent hammer-peening and are approved by field-experience. Thus, another step towards a reliable light-weight-design of welded components could be taken