Comparison of residual stress in equal matching and undermatching weld joints of the high strength steel thick plate

摘要

In this paper, numerical simulation by finite element software MARC was used to study the residual stress in equal matching and undermatching weld joints of the high strength steel thick plate. Equal matching weld selected ferritic welding consumables and the undermatching weld consisted of austenitic welding consumables. 3D finite element model of thermal-force coupling was developed and the distribution of residual stress in equal matching and undermatching weld was acquired. The simulation results were analyzed and compared. The results showed that the equivalent stress and longitudinal stress in undermatching weld joint are significantly smaller than those in equal matching weld joint, two transverse stresses are not very different. The stress maximum in equal matching case occurs in the weld and heat affected zone, and stress maximum in undermatching case appears only in the heat affected zone.