The size of the sensitization zone in 304 stainless steel welds
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Factors influencing the size and shape of the sensitization zone in 304 stainless steel welds have been studied through a statistically designed experiment. The results indicate that the width of the sensitization zone is in proportion to the magnitude of the heat input, except when very little fusion occurs. The minimum sensitization size can be obtained with a broadly distributed heat source traveling at high speed, and the maximum size can be obtained with low speed and a narrow heat distribution.
Under certain welding conditions, one can obtain welds which are free of sensitization on the surface, and hence, this process may lead to a new method of preventing sensitization-induced intergranular corrosion. By depositing surface sensitization-free welds on either side of a previously sensitized weld, the chromium carbide precipitates dissolve, and the sensitization on the plate surface is eliminated.
KeywordsWelding Heat Input Compressive Residual Stress Chromium Carbide Intergranular Corrosion
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