Weld decay (intercrystalline corrosion) in austenitic stainless steel is an 'in-service' corrosion problem caused by the formation of chromium-carbides at HAZ grain boundaries during welding. These effectively remove the chromium locally and prevent it from forming a corrosion resistant surface barrier, leading to corrosion on the chromium-depleted...
Found on
http://www.bocindustrial.co.uk/bocindustrial/technical/glossary/w.html
Intergranular corrosion, usually of stainless steels or certain nickel-base alloys, that occurs as the result of sensitization in the heat-affected zone during the welding operation.
Found on
http://www.encyclo.co.uk/local/20742
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