Peculiarities of the solidification mechanism of steel after Nd:YAG long-pulse laser welding

Valentin Iov; Florenta Costache; A. Marian; Dan Mihhi Buca

doi:10.1117/12.378723

23 February 2000 Peculiarities of the solidification mechanism of steel after Nd:YAG long-pulse laser welding

Valentin Iov, Florenta Costache, A. Marian, Dan Mihhi Buca

Proceedings Volume 4068, SIOEL '99: Sixth Symposium on Optoelectronics; (2000) https://doi.org/10.1117/12.378723
Event: SIOEL: Sixth Symposium of Optoelectronics, 1999, Bucharest, Romania

Abstract

The hot cracking problem encountered when 1 mm thick stainless steel sheets are seam welded using a long pulse Nd:YAG laser is studied. Cracks are observed only in regions where the primary austenite was formed in the cooling phase, depending on it amount in the weld. The initiators of cracks were found between the heat affected zone and base metal as a band of segregate. High repetition rates decrease the crack formation at constant average power and welding sped. The primary austenite dendrites are strongly influenced by cooling rate. Melt thickness increase with pulse energy when pulse duration and repetition rate are kept constant. The optimum focus position was approximately 0.5 mm below the level of the workpiece front face and produced good quality seam welds.

Citation Download Citation

Valentin Iov, Florenta Costache, A. Marian, and Dan Mihhi Buca "Peculiarities of the solidification mechanism of steel after Nd:YAG long-pulse laser welding", Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); https://doi.org/10.1117/12.378723

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