| Computational weld mechanics (CWM) is used to estimate the likelihood of hot crack nucleation in a welded joint. CWM predicts that a hot crack will nucleate when the evolution of the local state of stress and strain in the temperature region susceptible to hot cracking reaches a critical value. The local evolution of the stress, strain and temperature state determined by CWM is compared to experimentally measured value for material resistance for each type of hot cracking. This thesis evaluates the susceptibility to ductility dip cracking and solidification cracking, separately, for a single bead-on-plate welds of nickel-based alloys (FM82 and Inconel 600). This capability has the potential to estimate the risk of hot cracking in welded structures and of weld procedures at the design stage. Estimating the risk of hot cracking can aid in minimizing this risk and associated expenses. |
