ASPECTS OF THE TRANSITORY DEFORMATIONS CORRELATED WITH THE CRACKING AT HEAT IN WELDING

The cracking at heat is one of the main problems which appear at the a ustenitic steel welding, especially for the austenitics steel without delta ferite. The susceptibility regarding the cracking at heat can ti g studied analiticaly by the correlation between two factors : the fac tor stress constitued try tile tension and the deformations which appe ar in the welding process (FS) and the resistance factor constitued by the capacity of tile material to take the stress and the deformations appeared (FR). As a result of the interaction of the both factors is the posibility of cracking or not cracking into a concret case, named generaly the susceptibility at the heat cracking. The tendency at the cracking at heat can he apreciate with a quantitativ estimation, named critical speed of cracking (Vcf). The practical determination of thes e speed suposed for an concret exemple, the knowledge of real plastic deformation st the weld, which are determinated in this paper.