Abstract
The risk of hydrogen cracking and embrittlement in high strength (690 MN m–2 yield stress) steels has been briefly reviewed and an assessment has been made about the risk of increased crack sensitivity associated with an increase in filler metal carbon content from 0·07% to 0·1%. The experimental technique involved reviewing procedure qualification test records for any relationship between composition and weld mechanical properties. It was found that a wide variation in weld metal yield stress may occur during fabrication with 690 MN m–2 electrodes and that this scatter was sufficient to hide any effect of minor compositional variation. Welds which were deposited on an experimental fabrication using 0·1% carbon electrodes and a wide range of welding procedures have been examined exhaustively by ultrasonic testing and negligible evidence of cracking was found.
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