Abstract
Al–Cu–steel laminated structures with configurations of Al/Cu/steel and steel/Cu/Al were obtained via nanosecond pulsed laser welding. Cavities occurred at the bottom welds in two joints. Full-penetration welds occurred more easily in steel/Cu/Al joints compared to Al/Cu/steel joints. The metallurgical reaction of Al and Fe was impeded by Cu. The eutectic (α-Al+θ) and θ-CuAl2 phases were predominant at the Al/Cu interface in the steel/Cu/Al joints, while (Cu, Fe) was the main phase in Al/Cu/steel joint. The average lap shear force of the Al/Cu/steel joints (51.2 N) was superior to that of steel/Cu/Al joints (37.2 N). The fracture for both joins occurred at the Al/Cu interface. The fracture morphologies indicated that smaller connection width and Al/Cu IMCs caused the weld pullout failure (WPF) mode in steel/Cu/Al joints. The larger connection area and presence of (Cu, Fe) solid solution were responsible for the interfacial shear failure (ISF) mode in Al/Cu/steel joints.
| Original language | English |
|---|---|
| Pages (from-to) | 176-185 |
| Number of pages | 10 |
| Journal | Science and Technology of Welding and Joining |
| Volume | 27 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2022 |
Keywords
- Al–Cu–steel laminated structures
- Nanosecond pulsed laser welding
- interfacial microstructures
- lap configurations
- mechanical properties
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