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Fracture toughness assessment at different temperatures and regions within a friction stirred API 5L X80 steel welded plates

2015; Elsevier BV; Volume: 147; Linguagem: Inglês

10.1016/j.engfracmech.2015.08.006

1873-7315

Julián Arnaldo Ávila, Cassius Olívio Figueiredo Terra Ruchert, Paulo Roberto Mei, Ricardo Reppold Marinho, Marcelo Torres Piza Paes, Antonio J. Ramírez,

Hydrogen embrittlement and corrosion behaviors in metals

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.