HSLA-65 steel is regarded as an excellent naval ship steel. Its low carbon equivalent and strength-to-weight ratio make it an ideal candidate for future Canadian naval platforms. In this study, welds were fabricated using the flux core arc welding process using two different heat inputs. For the high heat input welds, the ductile-to-brittle transition temperature shifts above the minimum service temperature, while the ductile-to-brittle transition temperature for the low heat input case remains well below the service temperature. The reason for this significant shift in the transition temperature is examined, revealing that the sampling location of the Charpy notch is a significant factor, along with the underlying transformation product.
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Bayley et al. (2009) studied this question.