| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XIII
|
| Presentation Title |
Mitigating Solidification Cracking in Dissimilar Metal Welds (Mild Steel to Dual Phase Stainless Steel) |
| Author(s) |
Sojib Hossain, Jason Provines, Stephen Sharp, James Fitz-Gerald, Sean R. Agnew |
| On-Site Speaker (Planned) |
Sojib Hossain |
| Abstract Scope |
Solidification cracking can occur during welding, casting, and additive manufacturing. The primary cause is constrained shrinkage, which generates tension within the semisolid, mushy zone. When the liquid fraction is low, cracks can form along grain boundaries. In this study, ASTM A709 Grade 50CR stainless steel was welded to two grades of mild steel: structural steel (ASTM A36) and conventional bridge steel (ASTM A709 Grade 50W) using 309L solid and cored wire consumables with various welding processes, geometries, and heat inputs. Cracking was detected using radiographic, ultrasound, and metallographic tests. Results show that high heat input welds exhibited extensive cracking, primarily on the mild steel side in diluted single-phase austenitic regions while low heat input welds had minimal cracks. EBSD scans revealed solidification cracking occurs on grain boundaries with misorientation angles greater than 28°, with the highest frequency between 30° and 40°. Cored wire electrodes produced smaller grains and minimal cracking. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Joining, Solidification |