Studying Effect of CO2 Laser Cutting Parameters of Titanium Alloy on Heat Affected Zone and Kerf Width Using the Taguchi Method

Development of new material known as Ultra High Strength Steel (UHSS) able to improve the vehicle mass thus reflecting better fuel consumption. Transformation into high strength steel has been a significant drawback in trimming the UHSS into its final shape thus laser cutting process appeared to be the solution. This study emphasizes the relationship between Carbon Dioxide (CO2) laser cutting input parameters on 22MnB5 boron steel focusing on the kerf width formation and Heat Affected Zone (HAZ). Experimental research with variation of laser power, cutting speed and assisted gas pressure were executed to evaluate the responses. Metrological and metallographic evaluation of the responses were made on the outputs that are the kerf width formation and HAZ. Positive correlation for power and negative interaction for cutting speed were found as the major factors on formation of the kerf. For the HAZ formation, thicker HAZ were formed as bigger laser power were applied to the material. Cutting speed and gas pressure does not greatly influence the HAZ formation for 22MnB5 boron steel.

Download Full-text

Multi-pass laser cutting of carbon/Kevlar hybrid composite: Prediction of thermal stress, heat-affected zone, and kerf width by thermo-mechanical modeling

Proceedings of the Institution of Mechanical Engineers Part L Journal of Materials Design and Applications ◽

10.1177/1464420720930754 ◽

2020 ◽

Vol 234 (9) ◽

pp. 1228-1241

Author(s):

K Moghadasi ◽

KF Tamrin

Keyword(s):

Thermal Stress ◽

Heat Affected Zone ◽

Laser Cutting ◽

Manufacturing Industry ◽

Element Model ◽

Kerf Width ◽

Scanning Electron Micrographs ◽

Fiber Reinforced ◽

Heat Accumulation ◽

Damage Initiation

Numerical modeling offers considerable promise to reduce costs associated with trial-and-error process in the manufacturing industry. In laser cutting of fiber-reinforced composites, the developed thermal stress in the cut region has considerable inﬂuence on the application of the machined composite and the end product quality. Nevertheless, measurement of the thermal stress is quite challenging in practice. Here, an uncoupled thermo-mechanical finite element model is developed to accurately predict formation of heat-affected zone, kerf width, thermal field, and thermal residual stress of an anisotropic carbon/Kevlar fiber reinforced composite during multi-pass laser cutting process. A novel approach of element deletion incorporating temperature-dependent Hashin failure criteria and VUMAT subroutine is proposed. The study is carried out using Abaqus interlinked with Fortran compiler to define laser Gaussian beam (DFLUX subroutine) and material removal (VUMAT subroutine) for determining the temperature gradient and cut characteristics, respectively. The numerical results agree well with the experimental scanning electron micrographs of heat-affected zone and kerf width. In addition, residual temperature after subsequent pass results in greater temperature distribution and heat accumulation. It has also been established that the strength of composite gradually decays with the increase of temperature due to stiffness (elastic moduli) degradation in the area of the cutting zone, accelerating damage initiation in both fibers and matrix.

Download Full-text

Study on Kerf Width in Wire-EDM Based on Taguchi Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.1808 ◽

2011 ◽

Vol 110-116 ◽

pp. 1808-1816 ◽

Cited By ~ 1

Author(s):

Kumar Swain Abinash ◽

Ray Siddhartha ◽

Nirmal Kumar Mandal

Keyword(s):

Taguchi Method ◽

Tungsten Carbide ◽

Electrical Discharge Machining ◽

Cutting Parameters ◽

Kerf Width ◽

Machining Parameters ◽

Wire Edm ◽

Machining Performance ◽

Off Time ◽

Significant Factors

— This paper presents an experimental investigation on the influence of cutting parameters of wire cut Electrical Discharge Machining (Wire-EDM) during the machining of tungsten carbide and optimization of machining parameters on kerf width. The investigation was conducted by considering the varying parameter of average machining voltage, spark on time, spark off time, and capacitance with Taguchi method as optimizing technique. L9orthogonal array has been used to determine the S/N ratio, analysis of variance and ‘F’ test values for indicating most significant parameter affecting the machining performance. The significant factors average machining voltage for kerf width. Spark on time, spark off time and capacitance are obtained as insignificant parameters. Further verification of improvements in the quality characteristics has been made through conformation test to the chosen initial parameter setting. The optimal combination of WEDM parameters satisfies the real requirement of quality machining of tungsten carbide.

Download Full-text

Surface Quality of Ti-6Al-4V Titanium Alloy Parts Machined by Laser Cutting

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.3719 ◽

2020 ◽

Vol 10 (4) ◽

pp. 6062-6067

Author(s):

A. Boudjemline ◽

M. Boujelbene ◽

E. Bayraktar

Keyword(s):

Experimental Data ◽

Surface Roughness ◽

Titanium Alloy ◽

Laser Power ◽

Laser Cutting ◽

Cutting Speed ◽

Cutting Parameters ◽

Maximum Height ◽

Proposed Model

This paper investigates high power CO2 laser cutting of 5mm-thick Ti-6Al-4V titanium alloy sheets, aiming to evaluate the effects of various laser cutting parameters on surface roughness. Using multiple linear regression, a mathematical model based on experimental data was proposed to predict the maximum height of the surface Sz as a function of two laser cutting parameters, namely cutting speed and assist-gas pressure. The adequacy of the proposed model was validated by Analysis Of Variance (ANOVA). Experimental data were compared with the model’s data to verify the capacity of the proposed model. The results indicated that for fixed laser power, cutting speed is the predominant cutting parameter that affects the maximum height of surface roughness.

Download Full-text

Experimental Research of Laser Cutting 1Cr17Mn6Ni5N Steel Plates

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.998-999.526 ◽

2014 ◽

Vol 998-999 ◽

pp. 526-529

Author(s):

Zhan Guo Li ◽

Yao Chen Shi ◽

Wei Yuan ◽

Xiu Guang Yang

Keyword(s):

Laser Cutting ◽

Evaluation Method ◽

Influence Factors ◽

Cutting Speed ◽

Cutting Parameters ◽

Kerf Width ◽

Steel Plates ◽

Power Pulse ◽

The Difference ◽

Optimal Cutting Parameters

Due to complexity of laser cutting process and its many influence factors, this paper puts forward the evaluation method of laser cutting quality based on the difference of average upper and under kerf width from four points in two lines, systematically analyzes the influence rule and the influence degree of cutting speed, laser power, pulse width, repetition frequency on kerf width by laser cutting experimental study of 1Cr17Mn6Ni5N steel plates and provides a new method for evaluation of laser cutting quality and selection of optimal cutting parameters.

Download Full-text