Lazer destekli imalatta plazma dinamiklerinin teorik ve deneysel olarak araştırılması

Lazer destekli mikro-imalat (mikro kaynak, delme, yüzey yapılandırma vb…) prosesinin kalitesi elektronik, havacılık- uzay ve biyomedikal endüstrileri için özel bir öneme sahiptir. Lazerin oluşturduğu plazmanın dinamikleri lazer güç yoğunluğu, ışın odak çapı ve çevre koşulları tarafından belirlenmektedir. Plazma yoğunluğunda eşik değerine ulaşıldığında plazma korumasına bağlı ışınım kayıpları sebebiyle, lazer enerjisi malzemeye aktarılamamaktadır. Bu ayrışma eşiği mikro-imalat operasyonu için kritik bir role sahiptir. Bu makale kapsamında, titanyum malzeme için plazma dinamikleri teorik ve deneysel olarak incelenmiş ve faydalı prosess enerjisinin kaybını önlemek için optimum lazer yoğunluk eşiği rapor edilmiş ve numerik çalışmalarla karşılaştırılmıştır.

Anahtar Kelimeler:

Lazerden kaynaklanan patlama dalgaları, plazma fiziği, mikro imalat

Theoretical and experimental investigation of plasma dynamics for laser-induced machining mechanism

The quality of laser micro-machining process (micro welding, drilling, surface structuring etc…) has vital importance for electronic, aviation-aerospace and biomedical industries. Dynamics of laser-induced plasma are determined with some parameters such as laser intensity, beam waist diameter and ambient gas conditions. When the plasma density is limited with a threshold value, the laser energy can not transmitted to the material due to the rarefied plasma. This decoupling threshold has a crucial role for micro-machining operation. In the scope of this paper, the behaviour of the plasma dynamics has been examined both theoretically and experimentally for titanium material and optimal laser intensity threshold was reported to prevent dissipation of beneficial process energy and to compare numerical investigations.

Keywords:

Laser-induced detonation waves, Plasma physics, Micro machining,

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