COBEM99

S18 Processos Mecânico-Metalúrgicos

Title:

ANALYTICAL MODELING OF MULTIPASS WELDING PROCESS WITH DISTRIBUTED HEAT SOURCE

Summary :

ABSTRACT. IN THE WELDING PROCESS, THE MOST INTERESTING REGIONS FOR THE HEAT TRANSFER STUDY ARE THE FUSION ZONE (FZ) AND THE HEAT AFFECTED ZONE (HAZ), WHERE HIGH TEMPERATURES ARE REACHED. THESE TEMPERATURE LEVELS CAUSE PHASE TRANSFORMATIONS AND ALTERATIONS IN THE MECHANICAL PROPERTIES OF WELDMENT. THE ANALYSIS TO ESTIMATE THE TEMPERATURE DISTRIBUTION IN THE MULTIPLE PASS WELDING IS MORE COMPLEX THAN IN THE SINGLE PASS WELDING, DUE TO SUPERIMPOSED THERMAL EFFECTS OF ONE PASS OVER THE PREVIOUS PASSES. IN THIS WORK, A COMPARISON WAS MADE BETWEEN THERMAL CYCLES OBTAINED FROM ANALYTICAL MODELS REGARDING POINT (CONCENTRATED) AND GAUSSIAN (DISTRIBUTED) HEAT SOURCES. THE USE OF DISTRIBUTED HEAT SOURCE PREVENTS INFINITE TEMPERATURES NEAR THE FUSION ZONE. THE COMPARISON SHOWED THAT THE THERMAL CYCLES OBTAINED FROM THE DISTRIBUTED HEAT SOURCE MODEL ARE MORE RELIABLE THAN THOSE OBTAINED FROM THE CONCENTRATED HEAT SOURCE MODEL. KEYWORDS : DISTRIBUTED SOURCE, ANALYTICAL MODELING, MULTIPASS WELDING

Author :

Fassani, Roseli Suzuki
Trevisan, Osvair Vidal

Paper View :