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Abstract
Welding system design includes selection of base metal, filler metal and process parameters for a given application. Integrated modelling has always been considered as a pathway to arrive at generic welding system solutions. Based on recent publications, arguments are made that generic solutions are indeed difficult. This is due to inability of these models to consider complex and transient boundary conditions imposed by field welding conditions. In lieu of generic solutions, design of invariant microstructure is suggested as an alternative approach.
The author acknowledges that the hypotheses presented in this paper are based on many years of discussions and collaboration with world-renowned researchers in welding metallurgy, including Professor H. K. D. H. Bhadeshia (University of Cambridge), Professor T. DebRoy (Pennsylvania State University), Dr S. A. David (ORNL), Dr J. M. Vitek (ORNL), Dr M. L. Santella (ORNL) and Ms Marie A Quintana (Lincoln Electric). In addition, the author acknowledges that the welding system design examples presented in this paper are based on the collaborative research with Professor J. C. Lippold (OSU), Professor G. B. Olson (Northwestern University), Professor D. Seidman (Northwestern University), Dr M. Murugananth (Wollongong University), Dr J. Caron (Haynes International), Mr Xinghua Yu and Mr Tapasvi Lolla (OSU, PhD students).