Mass And Heat Transfer In Deep Penetration Laser Welding

Maichi Cantello; Diego Cruciani; Moreno Ciboldi; Michele Onorato

doi:10.1117/12.941240

22 September 1987 Mass And Heat Transfer In Deep Penetration Laser Welding

Maichi Cantello, Diego Cruciani, Moreno Ciboldi, Michele Onorato

Proceedings Volume 0801, High Power Lasers: Sources, Laser-Material Interactions, High Excitations, and Fast Dynamics; (1987) https://doi.org/10.1117/12.941240
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

Abstract

The phenomena related to deep penetration welding by means of concentrated energy beams are, in a first approximation, similar, even if the beam sources (electron and laser beams) and the irradiated materials (metals, quartz) differ. Clearly however, if the temperature distribution and the material flow dynamics are to be calculated, it can be seen that these similarities are merely qualitative, and consist of the presence of a vapour tube (key-hole) in the processed material. The mathematical models hitherto developed correspond exactly to experiments at a certain distance from the interaction point. Although several authors have investigated the physical condition of the key-hole, both theoretically and experimentally, additional data are needed in order to obtain satisfactory data of the temperatures and flows of the vapour and liquid metal, at least as far as the most common laser welding application is concerned. In the RTM laser centre, the data obtained by the various investigation methods are being correlated systematically. The devices most widely used are a fast framing camera, a fast slide to intercept the laser beam and a vacuum chamber for welding in a controlled atmosphere. The two CO2 laser sources used can vary their power from 1 kW to 15 kW. Data regarding stainless steel are dealt with in the greatest detail since this is the principal application of laser welding.

Citation Download Citation

Maichi Cantello, Diego Cruciani, Moreno Ciboldi, and Michele Onorato "Mass And Heat Transfer In Deep Penetration Laser Welding", Proc. SPIE 0801, High Power Lasers: Sources, Laser-Material Interactions, High Excitations, and Fast Dynamics, (22 September 1987); https://doi.org/10.1117/12.941240

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