The stochastic effects of assist gas in QCW and pulsed laser machining (percussion drilling) in steel are measured with a novel in situ high speed low coherence imaging system. Real-time imaging is delivered coaxially with machining energy and assist gas revealing relaxation and melt flow dynamics over microsecond timescales and millimeter length scales with ~10 micrometer resolution. Direct measurement of cut rate and repeatability avoids post cut analysis and iterative process development. Feedback from the imaging system can be used to overcome variations in relaxation and guides blind hole cutting.
Technological processes such as welding, braze welding or surface treatment utilising single-spot laser beams as welding power sources are well known and commonly applied. The improvement of technological processes and quality of treatment are subjects of research in terms of new laser welding technologies. The article presents attempted applications of several laser beams having various parameters in the braze welding of car body sheets, the welding of AlSicoated high strength steels and in the making of polymer-metal joints.
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