Application of flux-cored wire with aluminothermic filler for arc welding of E40 steel at low temperatures

Abstract

The problem of thermal stresses is considered. The process of electric arc welding of E40 steel at low temperatures is simulated. It is demonstrated that it is possible to use a flux-cored wire with an aluminothermic filler to reduce the residual stresses. The heat source is modeled by a double ellipsoid proposed by John A. Goldack. It is assumed that the plate material is elastoplastic and that strains are small and have elastic and plastic components. Reversible (elastic) strains are related to stresses by the Duhamel–Neumann law, while irreversible (plastic) strains arise and develop due to plastic flow according to the associated plastic flow law. It is established that the combined thermal effect increases the temperature range in which welding of E40 steel is possible, which is confirmed by the intensity of residual stresses.