Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 23, Issue 5, Pages 434-440Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2017.1408197
Keywords
Flash butt welding; texture; toughness; upset pressure; brittle failure; shear deformation
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Effect of upset pressure on the weld zone microstructure, texture evolution and its effect on toughness were investigated. It was observed that an increase in upset pressure leads to a decrease in the heat-affected zone width and also the grain size as a result of recrystallisation. It was also observed that insufficient upset pressure leads to porosity in the joints. Electron backscattered diffraction study on the weld zone showed that an increase in the upset pressure resulted in a sharp rise in (110)[001] and (110)[110] component. Shear deformation at the plate edges due to the constrained flow of material led to the evolution of Goss fibre component parallel to the fracture plane. The presence of Goss fibre components that are generated during welding as a result of upsetting operation played a critical role in decreasing the toughness at the weld zone compared to the parent material.
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