INVESTIGATION OF THE EFFECT OF ASSIST GAS TYPE AND PRESSURE ON GEOMETRICAL CONFIGURATION OF LASER DRILLED HOLES IN STAINLESS STEEL SHEETS USING Nd: YAG LASER

للكاتب :

A.M. KOHAIL

Mech Eng., Prod. Dept.(R), MTC , Cairo

ABSTRACT

Laser drilling has been widely used in industry. The laser drilling process occurs when the

laser beam is focused with enough intensity to melt and vaporize the drilled substrate. The

high throughput energy rate is one of the most important laser drilling advantages. Most of

laser material processing techniques use a gas jet in tandom with laser beam to accelerate

metal removal rate and it helps also for ejection of molten metal from cutting zone.In this

study three different types of assist gases were used for drilling of 1 mm thick stainless steel

substrate using Nd:Yag pulsed laser head with maximum power of 400 W. The used gases are

Oxygen,Nitrogen and Argon with a pressure varying from 2 to 6 bar. The laser beam was

delivered at different pulse energy and pulse shape. Scanning electron microscope was used

to capture the images of the drilled holes with spatter deposition area. Optical tool maker

microscope was used to measure both inlet and exit hole diameters to evaluate taper. The

obtained results showed the considerable influence of both assist gas type and pressure on

drilled holes geometrical configurations and accuracy at different pulse energy.

اترك تعليقاً

لن يتم نشر عنوان بريدك الإلكتروني. الحقول الإلزامية مشار إليها بـ *