Weldability estimation of steels for hot work by the CCT diagrams

Abstract

Problems of reparatory welding of the broken mandrel axle-shaft are considered in this paper. After visual inspecting of the damaged part and analysis of the crack position and static and dynamic loads, which caused the fracture, it was estimated that the broken part could be repaired, but by a very complex welding procedure combined with heat treatment. The prescribed reparation procedure consisted of proposing the welding procedures, selecting the filler metals and way of groove preparation, welding with the so-called EB insert, defining the welding parameters, prescribing the heat treatment before and during the welding, defining the welds deposition order, selecting the additional machining and defining the control type. The axle-shaft was successfully repaired and the spinner was capable of operating. The downtime was significantly decreased and the costs of procuring/manufacturing the new part avoided. The reparation procedure was done in own plant what provided for significant techno-economic benefits.