Aspects of the transitory deformations correlated with the cracking at heat in welding

Abstract
The cracking at heat is one of the main problems which appear at the austenitic steel welding, especially for the austenitics steel without delta ferite. The susceptibility regarding the cracking at heat can be studied analiticaly by the correlation between two factors : the factor stress constitued by the tension and the deformations which appear in the welding process (FS) and the resistance factor constitued by the capacity of the 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 be apreciate with a quantitativ estimation, named critical speed of cracking (Vcf). The practical determination of these speed suposed for an concret exemple, the knowledge of real plastic deformation at the weld, which are determinated in this paper.