| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Mechanizing Self Shielded Flux Core Wire to Achieve Robust Toughness on Girth Welds in Pipeline Construction |
| Author(s) |
Radhika Panday, Marie A Quintana |
| On-Site Speaker (Planned) |
Radhika Panday |
| Abstract Scope |
The use of semi-automatic self-shielded flux cored (FCAW-S) welding gained traction in pipeline welding of large diameter X-70 pipes over the last 20 years due to its ability to produce sound welds in high winds without the use of shielding gas. All other welding processes common in pipeline construction employ gas shields that require protection from high winds. One reason for limiting widespread use of FCAW-S in the past was its inability to achieve consistent Charpy toughness at levels expected for modern pipelines. Over the years, consumables have been optimized for weld performance through changes in design and manufacturing practices. In particular, Charpy toughness improved with inclusion control and operational stability. The next steps in industrialization of this process require more precise control of the process variables and welding practices than is achievable with semi-automatic welding. Therefore, the weld performance desired for modern pipelines can be achieved only by mechanization. Several simulated pipe joints and pipes were welded to gain a better understanding of the key process variables and the level of control required. It was concluded that mechanization of FCAW-S reliably provides essential control of the welding practice thereby enabling the weld metal to achieve consistent and robust Charpy toughness values while maintaining or improving overall quality and productivity. |
| Proceedings Inclusion? |
Undecided |