Transient model for the keyhole during laser welding

Abstract

A novel approach to simulating the dominant dynamic processes present during concentrated energy beam welding of metals is presented. A model for the transient behaviour of the front keyhole wall is developed. It is assumed that keyhole propagation is dominated by evaporation-recoil-driven melt expulsion from the beam interaction zone. Results from the model show keyhole instabilities consistent with experimental observations of metal welding, metal cutting and ice welding.