کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
739546 894099 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fresnel absorption and inverse bremsstrahlung absorption in an actual 3D keyhole during deep penetration CO2 laser welding of aluminum 6016
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Fresnel absorption and inverse bremsstrahlung absorption in an actual 3D keyhole during deep penetration CO2 laser welding of aluminum 6016
چکیده انگلیسی

An actual keyhole is captured by a high-speed camera during deep penetration laser welding of aluminum alloy 6016. With the help of spectrograph, plasma spectra are acquired, and then after Abel transformation, electron temperature is calculated. Through Lorenz nonlinear fitting, the FWHM of Stark broadening lines is obtained to compute electron density. To know more about the mechanism of deep penetration laser welding, both the effect of Fresnel absorption and inverse bremsstrahlung absorption of plasma on the laser power distribution is considered. Results indicate that electron temperature is very unstable in the keyhole which has a declining tendency in the radius direction, electron density increases in the depth direction while it does not change too much along radius. Laser intensity absorbed on the keyhole wall through Fresnel absorption is hardly uniform and distributes mainly on the front wall and the bottom of keyhole wall, and inverse bremsstrahlung absorption of keyhole plasma plays a dominant role in absorbing laser power compared with Fresnel absorption.


► Fresnel absorption and inverse bremsstrahlung absorption are systematically studied.
► The trend of electron temperature of keyhole plasma in an actual keyhole is studied.
► The trend of electron density of keyhole plasma in an actual 3D keyhole is studied.
► Inverse bremsstrahlung absorption is more important than Fresnel absorption.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics & Laser Technology - Volume 44, Issue 5, July 2012, Pages 1426–1436
نویسندگان
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