By Narendra B. Dahotre
Laser machining is an rising quarter with a large choice of purposes, starting from bulk machining in steel forming to micromachining and microstructuring in electronics and biomedical functions. the original houses of lasers enable to be used in versatile production innovations resembling laser-assisted mechanical machining (LAM) and laser-assisted chemical machining (LCM). Laser Fabrication and Machining of Materials offers a complete evaluate of the elemental ideas and rising functions of lasers relating to fabric removing and forming tactics, and in addition presents a hyperlink among complex fabrics and complicated processing and production techniques.
Laser Fabrication and Machining of Materials introduces readers to the basic houses and actual phenomena of laser machining and its purposes at the macro, micro, and nano scales. Examples of current, rising, and power thoughts are mentioned, giving scholars and working towards engineers alike the chance to extend their use of lasers in such disciplines as mechanical procedures, electronics, fabrics, and production.
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Additional info for Laser Fabrication and Machining of Materials
If it is considered that the electric and magnetic field carry the same amount of energy, then, according to above equation, the contribution of magnetic field to the force is smaller than that of the electric field by a factor of the order of v/c. Hence, the most important term in the above equation is eE. The absorbed radiation, thus, results in the excess energy of the charged particles such as kinetic energy of the free electrons, excitation energy of the bound electrons, etc. Eventually, the degradation of the ordered and localized primary excitation energy through various steps leads to the generation of heat.
Temperature reaches T1 (T1 < Tm) at time t1 (t1 < tp). Temperature reaches melting point (Tm) at time t2 (t2 < tp). Temperature reaches maximum, Tmax (Tmax > Tm) at time tp. Temperature decreases to melting point Tm at time t3 (t3 > tp). Temperature reaches T1 (T1 < Tm) at time t1 (t1 > tp). The corresponding temperature profiles in the depth of the material are presented in Fig. 8b for various times during laser irradiation. By tracing the melting point in the temperature verses depth plots, the positions of the solid–liquid interface can 44 2 Laser Materials Interactions Fig.
The continuous wave (CW) laser beams with constant laser intensity with time are easiest to define in the thermal model. The complexity in the thermal analysis arises due to pulsed operation of laser. In such analysis, it is important to define the temporal shape of the pulse. Various single-pulse shapes such as rectangular pulse, triangular pulse, and smooth pulse are shown in Fig. 15. Rectangular pulses are generally characterized by the width of the pulse; whereas triangular and smooth pulses are characterized by the width at full width half maxima (FWHM).