Abstract
Many times the power industry shutdowns due to unplanned maintenance. In such environments, the spallation/cracking is increased in the protective oxide layer, results an explosion in tube joints which threatens the safety of the power industry. In this investigation, microstructurally different regions of TIG joint in T11 boiler steel were examined by the thermogravimetry method under cyclic conditions. The kinetics of oxides in these regions of TIG joint after some initial cycles was parabolic with increased cracks at cyclic stresses. The higher spallation of oxide scale on the HAZ than the weld metal was because more cracking occurred under the cyclic process. The weld metal showed slow oxidation kinetics in comparison to HAZ.
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