Agradecimentos: The authors would like to acknowledge the financial support of the COLCIENCIAS by the scholarship No. 512 from 2010. Also, to Petrobras and LNNano/CNPEM for providing economic funding and provide the laboratories where this work was developed, to TenarisConfab for the materials...

Agradecimentos: The authors would like to acknowledge the financial support of the COLCIENCIAS by the scholarship No. 512 from 2010. Also, to Petrobras and LNNano/CNPEM for providing economic funding and provide the laboratories where this work was developed, to TenarisConfab for the materials donation. Special thanks is due to David Read and John Hoyos for their important review and suggestions of the document

Friction stir welding (FSW) is a promising candidate for use in pipeline steels because it offers high productivity and sound welded joints. This study presents a fracture toughness assessment of FSW-welded two-pass butt joints, different regions within the joints and tests temperatures (25 °C, −15...

Friction stir welding (FSW) is a promising candidate for use in pipeline steels because it offers high productivity and sound welded joints. This study presents a fracture toughness assessment of FSW-welded two-pass butt joints, different regions within the joints and tests temperatures (25 °C, −15 °C, −20 °C, −35 °C, −40 °C) were used. Base plates of API-X80 steel 12 mm thick were FSW-welded using two different pass sequences, coincident and alternate directions. The results presented consistently high toughness values down to −20 °C for all the assessed notches, which indicates that FSW may be suitable for general pipelines steels applications in that range of temperatures

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