Corrosion resistance of welded and brazed engineering joints Available to Purchase

Introduction Welding and brazing fall into the broad category of engineering joints, where the former is a stronger joint than the latter. Nevertheless, both these joints are heterogeneous and are susceptible to environmental effects, in the form of enhanced corrosion, due to their retained residual stresses and matrix heterogeneity. Partial melting, micro structural transformation, diffusional alloy layer formation, etc. are some of the phenomena met within these joints. It is argued that relief of stresses, by heating these joints to appropriate temperatures, which are below the transformation temperature range, may deactivate the stress raiser sites, so that susceptibility to micro galvanic action is considerably reduced. Such treatment may also cause thermally‐activated reorganization of the micro structure, resulting in matrix uniformity. Such structural uniformity and stress matching may pay further for reducing the corrosion loss by reduction of micro‐galvanic action.