Basic Understanding of Weld Corrosion

CHAPTER 1 Basic Understanding of weld CorrosionCORROSION FAILURES OF WELDS occur in spite of the fact that the proper basemetal and filler metal have been selected, indus-try codes and standards have been followed, andwelds have been deposited that possess fullweld penetration and have proper shape andcontour. It is not unusual to find that, althoughthe wrought form of a metal or alloy is resistantto Corrosion in a particular environment, thewelded counterpart is not. Further welds can bemade with the addition of filler metal or can bemade autogenously (without filler metal). How-ever, there are also many instances in which theweld exhibits Corrosion resistance superior tothat of the unwelded base metal. There also aretimes when the weld behaves in an erratic man-ner, displaying both resistance and susceptibil-ity to corrosive Influencing Corrosion of WeldmentsIt is sometimes difficult to determine whywelds corrode; however, one or more of the fol-lowing factors often are implicated: Weldment design Fabrication technique Welding practice Welding sequence Moisture contaminatio

ence of retained austenite in high-strength steel weld deposits. Another common dissimilar metal combina-tion involves the use of high-nickel alloys for weld repair of cast iron. Fe-55Ni welding elec-trodes are used to make weld deposits that can hold in solid solution many of the alloying ele-ments common to cast iron. Furthermore, weld

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  Basics, Understanding, Corrosion, Weld, Austenite, Detainer, Retained austenite, Basic understanding of weld corrosion

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