Application of Ultrasonic Testing in Ultra-Supercritical Unit Stellite Alloy Surfacing Quality Inspection
With the popularity of supercritical and ultra-supercritical units in power plants,the “familial” defects in unit equipments arise.This paper mainly researches the difficulties in surfacing welding quality testing of key stellite alloy components,such as main valve and intercept valve in supercritical and ultra-supercritical units.Then a set of effective ultrasonic testing and defect assessment methods are presented for stellite alloy surfacing quality inspection,especially suitable for evaluation and analysis of “ shelling” phenomenon between the alloy surfacing layer and the substrate.This research provides important means and basis for the quality inspection of key components of large units,and eliminates the potential safety hazards of the unit equipment in a timely manner to ensure the smooth running of the power grid.
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