NUMERICAL MODELLING OF RESIDUAL DEFORMATION IN DOUBLE SIDED FILLET AND PIPE BUTT WELDS

Abstract

Distortions occur in almost each arc welded joint. Nature of distortion depends on various parameters such as plate thickness, welding current, welding voltage, welding speed, and constraints applied on workpiece. The distortions and thermal history of a joint can be measured experimentally but the measurement procedure may be costly. In the present work a numerical elasto-plastic thermomechanical model has been developed for predicting the residual deformation and thermal history of submerged are welded double-sided fillet T- joints. A moving distributed heat source was used in the fmite element modelling of the double-sided fillet welding to create a realistic simulation of the process. The effect of filler metal deposition was taken into account by implementing a birth-and-death process for the elements. The transient temperature distributions were predicted using temperature-dependent material properties. The angular distortion profiles were predicted based on the transient temperature distributions of the fillet welds.