Abstract
This research examined the SMAW and TIG weldments in T22 steels after exposure in air at 900 °C under thermal-cyclic conditions. The kinetics of oxidation was identified by thermogravimetry-technique. The SMAW-welded steel oxidized at faster rate than TIG-welded because the formation of cracks of high extents in surface-oxide and voids in inner-scale, leads the oxide-scale in-thicker on the weld and the heat-affected zone together. TIG weldment showed slow oxidation kinetics and considerably lower weight-gains than that of SMAW, reason the minor presence of chromium oxide in inner oxide-scale reduced the oxidation rate as detected by EDX.
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