Abstract
Nitrogen absorption by iron, Fe-20Cr-10Ni alloy, and SUS329J1 duplex stainless steel during CO2 laser welding in an Ar-N2 gas mixture was investigated and compared with equilibrium data predicted on Sieverts’ law and data on absorption during arc and YAG laser welding. The nitrogen absorption during CO2 laser welding is lower than that during arc welding, but higher than that during YAG laser welding. Compared with arc welding, the lesser contact of monatomic nitrogen with the weld pool surface and the higher partial pressure of metal vapor in the keyhole may result in the lower nitrogen absorption during CO2 laser welding, while the very low density of monatomic nitrogen in the atmosphere during YAG laser welding due to the low-temperature plume may lead to the lower nitrogen absorption during YAG laser welding than during CO2 laser welding.
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Dong, W., Kokawa, H., Sato, Y.S. et al. Nitrogen absorption by iron and stainless steels during CO2 laser welding. Metall Mater Trans B 34, 75–82 (2003). https://doi.org/10.1007/s11663-003-0057-2
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DOI: https://doi.org/10.1007/s11663-003-0057-2