Validation of a computational model for autogenous arc welding

Abstract

A three dimensional transient computational model of heat transfer are welding is generalized, and then validated by comparison to Rosenthal's solution for moving point sources of heat. The current version of the code allows much greater flexibility in the specification of the thermal input from the arc. The resulting surface temperature profiles and fusion zone shapes are compared to those measured experimentally for several input power levels ofr autogenous gas tungsten arc welding. Arc efficiency is experimentally determined using change of phase of a liquid fluorocarbon. The model is shown to be useful for modeling autogenous welding of thick plates. Weld seam misalignment and surface flaw detection are shown to be possible ahead of hte arch with accurate surface temperature detection methods. The potential of the model are creating a database of fusion and heat zone sizes, temperature profiles, and coding rates for various materials, processes, and power levels is indicated.