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Laser welding of high nitrogen steel

: Beyer, E.; Kalla, G.; Petschke, U.; Schmidt, B.; Menzel, J.; Trösken, G.

International Conference on High Nitrogen Steels <2, 1990, Aachen>
Conference Proceedings
Fraunhofer ILT ()
CO2; ferritic and austenitic steel; formation of pores; high nitrogen steel; non-thermodynamical equilibrium; optimized process parameter; process parameter; YAG-laser

The feasibility of laser welding of high nitrogen ferritic and austenitic steels was investigated for different laser types (CO2 and Nd:YAG). The process parameters of laser welds were optimized with respect to the minimization of the formation of pores in the seam. Even in the state of non-thermodynamical equilibrium, laser welds of high nitrogen steel are characterized by a small evaporation loss of nitrogen. Results concering the porosity, the hardness profile as well as the distribution of signigicant elements at optimized process parameters will be reported.