Abstract
Mathematical models and the associated numerical techniques have been developed to study the following cases: 1) the formation and collapse of a keyhole, 2) the formation of porosity and its control strategies, 3) laser welding with filler metals, and 4) the escape of zinc vapor in laser welding of galvanized steel. The simulation results show that the formation of porosity in the weld is caused by two competing mechanisms: one is the solidification rate of the molten metal and the other is the speed that molten metal backfills the keyhole after laser energy is terminated. The models have demonstrated that porosity can be reduced or eliminated by adding filler metals, controlling laser tailing power, or applying an electromagnetic force during keyhole collapse process. It is found that a uniform composition of weld pool is difficult to achieve by filler metals due to very rapid solidification of the weld pool in laser welding, as compared to that in gas metal arc welding.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 180-185 |
| Number of pages | 6 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4831 |
| DOIs | |
| State | Published - Dec 1 2002 |
| Event | First International Symposium on High-Power laser Macroprocessing - Osaka, Japan Duration: May 27 2002 → May 31 2002 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering