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Proceedings Paper

Peculiarities of the solidification mechanism of steel after Nd:YAG long-pulse laser welding
Author(s): Valentin Iov; Florenta Costache; A. Marian; Dan Mihhi Buca
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Paper 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.

Paper Details

Date Published: 23 February 2000
PDF: 6 pages
Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378723
Show Author Affiliations
Valentin Iov, National Institute for Laser, Plasma and Radiation Physics (Romania)
Florenta Costache, National Institute for Laser, Plasma and Radiation Physics (Romania)
A. Marian, National Institute for Laser, Plasma and Radiation Physics (Romania)
Dan Mihhi Buca, National Institute for Laser, Plasma and Radiation Physics (Romania)


Published in SPIE Proceedings Vol. 4068:
SIOEL '99: Sixth Symposium on Optoelectronics
Teodor Necsoiu; Maria Robu; Dan C. Dumitras, Editor(s)

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