Abstract
Galvanized steel has defects such as porosity and spatter during welding due to the presence of zinc coating. Currently, laser welding of galvanized steel mainly adopts plate gap to volatilize the zinc vapor. However, the zero-gap condition is desired for part component assemblies. The molten pool is the only way for zinc to escape in zero-gap condition. Oscillating laser has an inhibition effect on the defects. Consequently, it was applied to weld DP780 galvanized steel with zero-gap. The impact of various oscillation parameters on porosity and spatter was analyzed. The impact of various oscillation modes on defects primarily stems from their differing oscillation speeds. The experiment results showed that the spatter and porosity suppression under zig-zag oscillation was excellent, due to stabilized keyhole and slow solidification. The optimal parameters were 120 Hz and 1.2 mm, respectively. In addition, the solidification of the molten pool under the optimal oscillation parameter was 66.6% boost compared to that without oscillation.
| Original language | English |
|---|---|
| Pages (from-to) | 1879-1890 |
| Number of pages | 12 |
| Journal | Welding in the World, Le Soudage Dans Le Monde |
| Volume | 69 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2025 |
Keywords
- Keyhole
- Oscillating laser
- Porosity
- Spatter
- Zinc vapor
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