Influen ce of the welding process on martensitic high strength steel

The subject of the study is martensitic 22MnB5 steels, which are used in the automotive industry. The main purpose of the pe r- formed analyses is a study of strength differences in heat affected zones of the s pot welding. For the needs of the strength decrease asses s- ment, the critical layer of the heat affected area was experimentally simulated. The aim of the work is to determine the most suitable metho d- ology for evaluating the local changes of the elastic - pla stic material response. The aim of this work is to determine the optimal methods for the determination of the yield strength and to find a firming trend in these zones.