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Abstract
A simple model for the inertia welding of a nickel based superalloy is proposed. The heat flow occurring in the vicinity of the joint is considered, assuming it to be one-dimensional, and this is coupled to a treatment of the stress state expected there using Hill’s general method, so that the upset can be estimated. A state variable constitutive model is included, for the IN718 alloy. It is demonstrated that many of the important characteristics of the process are predicted correctly. It is shown that the shear stress developed at the last stage of the process must be accounted if the upset is to be correctly predicted. The results are compared with those from a 2½D finite element model of the process, and the differences rationalised.
One of the authors (LY) is grateful for financial aid from Department of Metallurgy and Materials, University of Birmingham and the Overseas Research Student Awards Scheme (ORSAS). The authors are grateful to Professor J. Brooks from the AFRC, University of Strathclyde, for his help with the constitutive model used. The authors also thank Dr F. Daus from the University of Birmingham for helpful discussions.