| About this Abstract |
| Meeting |
2022 AWS Professional Program
|
| Symposium
|
2022 AWS Professional Program
|
| Presentation Title |
An Investigation into the Effects of Stir Zone Chemistry on Fracture Toughness in Friction Stir Welded Pipeline Grade Steel |
| Author(s) |
Michael Eff, Jerry Gould, Tim Stotler, Hyeyun Song |
| On-Site Speaker (Planned) |
Michael Eff |
| Abstract Scope |
Friction Stir Welding (FSW) of thick section steel has demonstrated unique attributes, including near matching tensile strengths and the ability to join up to 1.0-in. thick steel in a single pass. However, fracture toughness at low temperature has been found to be reduced and worsens as the thickness of the weld increases. This study focuses on understanding the metallurgical causes of the low toughness. Two weld chemistries were examined both joined via FSW, an autogenous X-70 weld and an X-70 weld using a consumable insert of made of LA-80 submerged arc filler metal. Crack tip opening displacement (CTOD) testing was used to quantify the fracture toughness of the two weld chemistries. The average toughness of the chemistries is similar with a large scatter in both. Scanning electron microscopy (SEM), fractography, electron backscatter diffraction (EBSD), and optical microscopy were used to characterize the stir zone and CTOD fracture faces. |
| Proceedings Inclusion? |
Undecided |