About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
|
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
|
| Presentation Title |
Assessing Accuracy of Solidification Cracking Criteria for Fusion Welding of High-Strength Aluminum in Houldcroft Weldability Test |
| Author(s) |
Zenan Zhang, Paul Blackhurst, Boyd Panton, Wei Zhang |
| On-Site Speaker (Planned) |
Zenan Zhang |
| Abstract Scope |
A variety of criteria have been developed to evaluate the solidification cracking susceptibility for fusion welding and additive manufacturing. Many criteria are focused on the material’s inherent resistance to cracking and do not account for processing conditions. In this study, Houldcroft weldability test is performed where aluminum alloy 7075 sheet is laser-welded autogenously. The weld microstructure and crack length are characterized with optical and electron microscopy. A finite element thermo-mechanical model is developed to predict the evolution of temperature, stress and strain fields in the aluminum workpiece during welding. Existing solidification cracking criteria based on liquid filling or solid fracture are implemented into the thermo-mechanical model to predict the crack location. By comparing the numerical prediction with the experimental data, the accuracy of different cracking criteria is assessed. Such assessment is useful to identify further enhancements needed for models to predict how local constraint and thermal gradient affect cracking. |
| Proceedings Inclusion? |
Undecided |