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Experimental evaluation of Co2 laser cutting quality of ultra high strength steel (UHSS) using nitrogen as an assisted gas

Mohamad Tahir, Abdul Fattah (2015) Experimental evaluation of Co2 laser cutting quality of ultra high strength steel (UHSS) using nitrogen as an assisted gas. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Ultra High Strength Steel (UHSS) is widely used in vehicle as it able to improved durability of the vehicle while reducing the mass. Laser cutting process has been an alternative choice in trimming the UHSS to regain the final shape. Cutting quality is a crucial issues in trimming the UHSS especially interm of dimensional accuracy. This project is intended to study the effect of input parameters of CO2 laser cutting on Ultra High Strength Steel (UHSS) focusing on the cutting quality and mechanical properties. CO2 laser cutting machine with 22MnB5 Boron steel was used to identify the cutting quality. The quality of the cut was monitored by measuring the kerf width and taper ratio while on mechanical properties, heat affected zone and microhardness were evaluated using metallographic approach. Laser power, cutting speed, assist gas pressure and assist gas type were varied to evaluated the effect on each responses. Result shows that power intensity at focusing point on the surface of material play important roles in determining the quality of cut and mechanical properties. Low laser power with high cutting speed will produce better cutting quality and mechanical properties. Gas pressure doesn’t highly influence the cutting quality but effecting the mechanical properties such as HAZ formation and hardness of the HAZ region.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ1040-1119 Machinery exclusive of prime movers
Depositing User: Normajihan Abd. Rahman
Date Deposited: 29 Feb 2016 08:32
Last Modified: 29 Feb 2016 08:32
URI: http://eprints.uthm.edu.my/id/eprint/7692
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