Experimental Study on the Fracture Toughness of Welded Joints of API X90 High-grade Pipeline Steels Using Single-Edge-Notched Tension Specimens
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The fracture toughness and R-curves of welded joints of API X90 pipeline steels were experimentally studied. Single-edge- notched tension (SENT) specimens and a normalization method were adopted. Joints welded by using three technologies (A, B, and C) were investigated. The results show that the SENT specimen could be used to test the fracture toughness and R-curves of the welded joint; the welded joint of welding method B presented the poorest fracture toughness; and the R-curves and fracture toughness of the heat-affected zone were seriously affected by the weld zone and base metal. A new idea to test the fracture toughness and R-curves of the heat-affected zone was also proposed.
KeywordsX90 High-grade pipeline SENT Welded joint Fracture toughness
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The authors gratefully acknowledge the sponsorship of this work by the Young Scholars Development Fund of SWPU (Grant No. 201699010002), the PetroChina Innovation Foundation (Grant No. 2016D-5007-0602), the Scientific Research Starting Project of SWPU (No. 2017QHZ003), and the National Key R&D Program of China (Grant No. 2016YFC0802100).
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