About this Abstract |
| Meeting |
2026 AWS Professional Program
|
| Symposium
|
2026 AWS Professional Program
|
| Presentation Title |
Weld Microstructure in Duplex Stainless Steels Using a Novel Waveform-Gas Combination |
| Author(s) |
Corey Cox, Andres Fischdick Acuna |
| On-Site Speaker (Planned) |
Corey Cox |
| Abstract Scope |
Duplex stainless steels (DSS) exhibit distinctive properties which require precise chemical composition and thermal history. Additionally, porosity is a challenge in GMAW of DSS; however, a new gas (69.75Ar/30He/0.25CO₂) has emerged for porosity mitigation. The effect of this gas on metal transfer and arc stability was investigated. Consequently, a new waveform was developed to improve operability.
This study evaluates the new waveform-gas combination using three DSS filler wires. One-inch-thick plates were welded using austenitic and duplex stainless base materials. Mechanical testing followed ISO 17781, including Charpy V-notch testing at −46°C and ductile-to-brittle-transition-temperature (DBTT) characterization.
Weld metal ferrite-austenite phase balance and austenite grain size were analyzed. Results demonstrated that austenite grain area was the primary parameter controlling DBTT, while austenite fraction and grain continuity governed upper shelf energy. These features were strongly influenced by the welding process and base material selection, highlighting the critical role of process control in optimizing toughness. |
| Proceedings Inclusion? |
Undecided |