WRC 354:1990

$31.20

Part 1: Failure Analysis of a Service-Exposed Hot Reheat Steam Line in a Utility Steam Plant; Part 2: The Influence of Flux Composition on the Elevated Temperature Properties of Cr-Mo Submerged Arc Weldments

Published By	Publication Date	Number of Pages
WRC	1990	139

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Description

Part 1: Failure Analysis Of A Service-Exposed Hot Reheat Steam Line In A Utility Steam Plant

A crack approximately 14 inch long was discovered in a longitudinal seam weld in a hot reheat line of TVA Gallatin Unit 2 during ultrasonic inspection (and subsequently by MT examination). Initially a boat sample was removed and an entire spool piece (20 ft) was subsequently replaced. A metallurgical evaluation was undertaken to determine the characteristics of the defect and the reason for its occurrence.

Part 2: The Influence Of Flux Composition On The Elevated Temperature Properties Of Cr-Mo Submerged Arc Weldments

Following a number of premature service failures in SA weldments of critical power plant components, a test program was initiated to assess the influence of SA flux composition on the elevated temperature properties of weld metal. The interest in the flux was based on evidence that extensive creep damage in failed SA weld metal was intimately associated with numerous nonmetallic inclusions present in the deposit.

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