Characteristics of Underwater Swirling Plasma Arc Cut Quality

2010 ◽  
Vol 97-101 ◽  
pp. 3974-3977 ◽  
Author(s):  
Jia You Wang ◽  
C.H. He ◽  
W.H. Li ◽  
F. Yang
Keyword(s):  
Oxygen Content ◽  
Heat Affected Zone ◽  
Plasma Cutting ◽  
Plasma Arc ◽  
Plasma Process ◽  
Low Speed ◽  
Cutting Heat ◽  
Cut Quality ◽  
Hardness Increase ◽  
Cut Surface

The present work experimentally investigates the cut quality for underwater dual swirling plasma arc process at different operating gases. With a decrease in the oxygen content of the cutting operating gas, kerf shape and cut surface smoothness go well, but the adherent dross and cut hardness increase while cutting heat affected zone becomes wide. On the low-speed side of the cut, there are smaller bevel angle, more dross, and greater straightness and hardness. Compared with the dry plasma cutting, the underwater plasma process yields a cut of better shape but higher hardness.

Effect of Arc Current Ultrasonic-Frequency Pulsation on Plasma Cut Quality

2009 ◽  
Vol 628-629 ◽  
pp. 721-726 ◽  
Author(s):  
Jia You Wang ◽  
J.H. Yu ◽  
C.H. He ◽  
F. Yang
Keyword(s):  
Process Parameters ◽  
Pulse Current ◽  
Ultrasonic Frequency ◽  
Plasma Cutting ◽  
Cutting Heat ◽  
Cut Quality ◽  
Arc Current ◽  
Cutting System ◽  
Pulsed Arc ◽  
Current Pulsation

The present work proposes a novel plasma cutting system using the ultrasonic frequency pulsed arc, and then experimentally investigates the effect of pulse process parameters on cut quality in the frequencies of 20-60 kHz. It is shown that kerf widths, bevel angle, straightness and dross attached level decrease obviously with the appropriate increases in the frequency and amplitude of pulse current. Furthermore, cutting heat affected zone narrows and cut hardness drops clearly in the pulsed cutting. This current pulsation can thus improve plasma cut quality remarkably, and finally leads to a narrower, flatter and more perpendicular cut of better remachinability. Experimental results simultaneously demonstrate that the effectiveness of the ultrasonic-frequency pulsed cutting process developed at the low current of arc.

Experimental study of mild steel cutting process by using the plasma arc method

2021 ◽  
Vol 108 (2) ◽  
pp. 75-85
Author(s):  
H.M. Magid
Keyword(s):  
Industrial Process ◽  
Scanning Speed ◽  
Cutting Parameters ◽  
Operating Conditions ◽  
Kerf Width ◽  
Cutting Process ◽  
Plasma Cutting ◽  
Plasma Arc ◽  
Cutting Equipment

Purpose: In this study, plasma arc cutting (PAC) is an industrial process widely used for cutting various away types of metals in several operating conditions. Design/methodology/approach: It is carried out a systematic or an authoritative inquiry to discover and examine the fact, the plasma cutting process is to establish the accuracy and the quality of the cut in this current paper assessed a good away to better the cutting process. Findings: It found that the effect of parameters on the cutting quality than on the results performed to accomplish by statistical analysis. Research limitations/implications: The objective of the present work paper is to achieve cutting parameters, thus the quality of the cutting process depends upon the plasma gas pressure, scanning speed, cutting power, and cutting height. Practical implications: The product of the plasma cutting process experimentally has been the quality of the cutting equipment that was installed to monitor kerf width quality by exam the edge roughness, kerf width, and the size of the heat-affected zone (HAZ). Originality/value: The results reveal that were technically possessed of including all the relevant characteristics, then a quality control for the cutting and describe the consequence of the process parameters.

Fiber laser processing of GFRP composites and multi-objective optimization of the process using response surface methodology

2018 ◽  
Vol 53 (11) ◽  
pp. 1459-1473 ◽  
Author(s):  
Shiva Dayal Rao B ◽  
Abhijeet Sethi ◽  
Alok Kumar Das
Keyword(s):  
Response Surface Methodology ◽  
Fiber Laser ◽  
Response Surface ◽  
Process Parameters ◽  
Heat Affected Zone ◽  
Cutting Speed ◽  
Kerf Width ◽  
Laser Irradiance ◽  
Input Process ◽  
Cut Surface

In the present investigation, a continuous wave fiber laser with maximum power of 400 W was used to cut a glass fiber reinforced plastic sheet of 4.56 mm thickness using Nitrogen as assisting gas. The influence processing parameters such as laser irradiance, gas pressure, and cutting speed on the cut surface quality were investigated by using response surface methodology. The different responses of laser cut surface such as upper kerf width, taper percentage along the cut depth, and heat-affected zone on the top surface were measured to analyze the influence of input process parameters on the responses. A statistical analysis on the obtained results was conducted and found that the optimum values of different input process parameters were laser irradiance: 8.28 × 105 watt/cm2, cutting speed: 600 mm/min and assisting gas pressure: 7.84 bar. The corresponding values of responses were upper kerf width: 177.4 µm, taper 0.73%, and heat-affected zone on top surface: 109.23 µm. The confirmation experiments were conducted with the obtained optimum parameter setting and observed that the predicted values and experimental values for upper kerf width, taper percentage and top surface heat-affected zone were within the error limits of 2.52%, 1.84%, and 0.45%, respectively. Furthermore, damages like loose fibers, interlayer fractures, evaporation of matrix material and fiber breakages were observed.

Analysis of Roughness and Heat Affected Zone of Steel Plates Obtained by Laser Cutting

2014 ◽  
Vol 974 ◽  
pp. 169-173 ◽  
Author(s):  
Imed Miraoui ◽  
Mohamed Boujelbene ◽  
Emin Bayraktar
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Heat Affected Zone ◽  
Laser Power ◽  
Laser Cutting ◽  
Major Effect ◽  
Steel Plates ◽  
Beam Diameter ◽  
Laser Beam Diameter ◽  
Cut Surface

In the present study, high-power CO2 laser cutting of steel plates has been investigated and the effect of the input laser cutting parameters on the cut surface quality is analyzed. The average roughness of the cut surface of the specimens, produced by different laser beam diameter and laser power, were measured by using roughness tester. The scanning electron microscopy SEM is used to record possible metallurgical alterations on the cut edge. The aim of this work is to investigate the effect of laser beam diameter and laser power on the cut surface roughness and on the heat affected zone width HAZ of steel plates obtained by CO2 laser cutting. An overall optimization was applied to find out the optimal cutting setting that would improve the cut surface quality. It was found that laser beam diameter has a negligible effect on surface roughness but laser power had major effect on roughness. The cut surface roughness decreases as laser power increases. Improved surface roughness can be obtained at higher laser power. Also, laser beam diameter and laser power had major effect on HAZ width. It increases as laser power increases.

Single-Pass and Multi-Pass Laser Cutting of Si–SiC: Assessment of the Cut Quality and Microstructure in the Heat Affected Zone

2007 ◽  
Vol 19 (3) ◽  
pp. 170-176 ◽  
Author(s):  
F. Quintero ◽  
J. Pou ◽  
F. Lusquiños ◽  
A. Riveiro ◽  
M. Pérez-Amor ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Laser Cutting ◽  
Single Pass ◽  
Cut Quality

scholarly journals Influence of material melt kinematic viscosity upon treatment quality at fine-jet plasma cutting of bimetallic compositions

2017 ◽  
Vol 2 (5) ◽  
pp. 3-8
Author(s):  
Харис Рахимянов ◽  
Kharis Rakhimyanov ◽  
Андрей Рахимянов ◽  
Andrey Rakhimyanov
Keyword(s):  
Kinematic Viscosity ◽  
Treatment Quality ◽  
Burr Formation ◽  
Plasma Cutting ◽  
Aluminum Melt ◽  
Melting Temperatures ◽  
Refractory Oxides ◽  
Copper Melt ◽  
Jet Plasma ◽  
Cut Surface

The paper reports the peculiarities in the formation of a cut slot of bimetallic “steel 3 + aluminum 5 M” composition and “steel 3 + copper M1” composition at fine-jet plasma cutting. A different character of a cut channel formation of compositions at a package cut on different sides is revealed. When processing “steel + aluminum” composition on the side of steel a cut surface on the aluminum area has course roughness. A burr formation on the lower edge of a cut is also observed. It is explained by considerable difference in melting temperatures and thermal conduction of steel and aluminum. At the changed of a front side of a cut from steel to aluminum occurs sedimentation of aluminum melt on the steel area which is explained by a high kinematic viscosity of aluminum melt. The formation of refractory oxides in aluminum melt is defined that contributes to the increase of its viscosity and difficulty in the complete elimination from a cut channel. At the cutting of bimetallic “steel 3 + copper M1” composition of a copper side a cut surface on both areas is formed without visible traces of sedimentation of steel and copper melt caused by a low kinematic viscosity of copper and steel melts.

Prediction of laser cutting heat affected zone by extreme learning machine

2017 ◽  
Vol 88 ◽  
pp. 1-4 ◽  
Author(s):  
Obrad Anicic ◽  
Srđan Jović ◽  
Hivzo Skrijelj ◽  
Bogdan Nedić
Keyword(s):  
Extreme Learning Machine ◽  
Heat Affected Zone ◽  
Laser Cutting ◽  
Cutting Heat ◽  
Learning Machine

Assessment of Laser-Cut Quality on the Basis of Acoustic Emission Signals Captured with a PZT Sensor

2008 ◽  
Vol 589 ◽  
pp. 215-220 ◽  
Author(s):  
Janez Grum ◽  
Tomaž Kek
Keyword(s):  
Acoustic Emission ◽  
Automobile Industry ◽  
Laser Cutting ◽  
Steel Plate ◽  
Cutting Conditions ◽  
Measured Signal ◽  
Time Interval ◽  
Cut Quality ◽  
Cut Surface ◽  
Ae Signals

The paper describes an analysis of the AE signals captured with PZT sensor during and after laser cutting. In the course of cutting the continuous AE signals are treated in a defined time interval. After cutting, bursts of acoustic emission will occur. They are due to solidification of the molten material and cooling of the laser-cut surface. The results shown refer to cutting of steel plate DC04 and of austenitic stainless steel plate X5CrNi18-10. Both plate types are frequently used in automobile industry, where, because of mass production, optimisation of the cutting process is desired. Numerous laser-cutting conditions assuring different quality levels of the cut made were chosen. It was proved that the laser cutting conditions had a significant influence on the amplitude value and intensity of the continuous signal and AE activity after the termination of laser cutting. Separately it was also confirmed that there was a relation between the measured signal and laser-cut quality, which is shown, to a large extent, by the presence of dross at the lower edge of the cut.

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