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Porosity Formation in Laser Welding of Tailored Blanks
Technical Paper
2003-01-2852
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For the laser welded tailored blanks (TBs), the formability of TBs depends on pores in the weld bead. Those pores are easily formed by CO2 laser but hardly observed by YAG laser. Based on a quantitative analysis of nitrogen content in the weld metal, gases in pores and the laser induced plasma, it is considered that high temperature of the plasma encourages dissolving nitrogen into the molten metal from the root surface and the dissolved nitrogen forms porosity due to an abrupt decreasing of nitrogen solubility at solidification of the molten metal. Also, the plume temperature in YAG laser welding is lower than the plasma temperature in CO2 laser welding and the nitrogen dissolution must therefore be suppressed in YAG laser welding.
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Citation
Miyazaki, Y., Furusako, S., and Ohara, M., "Porosity Formation in Laser Welding of Tailored Blanks," SAE Technical Paper 2003-01-2852, 2003, https://doi.org/10.4271/2003-01-2852.Also In
References
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- Elliott J. E. Thermochemistry for Steelmaking AISL Cambridge, Mass 1963
- Uda M. Ohno S. Wada T. Solubility of Nitrogen in Arc- and Levitation-Melted Iron and Iron Alloys Japan Welding Society 38 4 1969 382 392