scholarly journals Research on water-air plasma cutting process of carbon steel

2021 ◽  
Vol 66 (2) ◽  
pp. 53-62
Author(s):  
Shanguo Han ◽  
Detao Cai ◽  
Ziyi Luo ◽  
Yaoyong Yi
Keyword(s):  
Carbon Steel ◽  
Oxide Layer ◽  
Structural Features ◽  
Working Environment ◽  
Plasma Cutting ◽  
Plasma Arc ◽  
Air Plasma ◽  
Energy Status ◽  
Temperature Plasma ◽  
Water Curtain

The principle and equipment of water-air plasma cutting has been introduced in this paper. Especially, the function of water is not only to prevent the cutting pool from oxidizing in the form of a water curtain, but also to generate plasma in the center of arc. The Numerical Model of Low temperature Plasma has been eatablished with equation of energy, status, motion and chemical dynamic equation. Working process, mechanical properties and micro-structural features of 20 mm carbon steel processed by water-air plasma cutting and air plasma have been investigated, which choose the same parameters. The voice of plasma arc and dust of pool are being limited in the area of water curtain, so that the noise and dust of water air plasma cutting can be compared favorably with under-water plasma cutting. Lower temperature of water-air cutting plates is due to the fluent water taking off energy of metal pool during cutting. It is impossible to find oxide layer on the incisions surface of water-air plasma cutting, and the heat affected zone is so thin that welding can be carried out directly after cutting without any else process. So inclusion also can be avoided in the weld. But for air plasma cutting, lot of time is waste to remove oxide layer by mechanical polishing before welding. With the help of addition plasma arising from water, the water-air plasma arc becomes stronger, so smooth and high flatness cutting surface can be acquired. Compared with the technology of air plasma cutting, water-air plasma cutting has benefits of friendly working environment, higher quality incision and lower cost.

scholarly journals The influence of plasma gas on changes in chemical composition and structures during the cutting process

2021 ◽  
Vol 13 (3) ◽  
pp. 151-157
Author(s):  
Agnieszka Rzeźnikiewicz ◽  
◽  
Jacek Górka ◽  
Keyword(s):  
Liquid Metal ◽  
Chemical Elements ◽  
Hydrogen Plasma ◽  
Cutting Process ◽  
Material Structure ◽  
Chemical Compositions ◽  
Plasma Cutting ◽  
Plasma Arc ◽  
Air Plasma ◽  
Plasma Arc Cutting

Cutting is usually one of initial and basic operations of the manufacturing process of welded structures and realization constructions elements. Thermal cutting, in particular plasma arc cutting is often used to prepare elements. The plasma arc cutting process involves melting and ejecting the liquid metal from the cutting gap with a highly concentrated plasma electric arc which is generated between the non-consuable electrode and the workpiece. The paper presents the results of research on the influence of plasma gas on structural changes and chemical compositions changes resulting unalloyed steel cutting by air plasma arc. It was shown that in the air plasma arc cutting process the amorphous layer with a very high nitrogen content (about 1.6%) and a hardness of 750 HV 0.2 was used. This high nitriding effect is due to the diffusion of nitrogen from the plasma gas. As a result of the interaction of air plasma arc gases on the liquid metal, the cutting surface is carburized (about 0.5%). The alloy components are also burnt according to the theory of selective oxidation of chemical elements. The material structure after the air plasma cutting process shows the structures between the structure formed after oxygen cutting processs and nitrogen plasma cutting process. The process of argon-hydrogen plasma cutting has the least influence on the cut material.

scholarly journals Influence of Plasma Torch Design on Cutting Quality during Precision Air-Plasma Cutting of Metal

2020 ◽  
Vol 50 (3) ◽  
pp. 159-165 ◽  
Author(s):  
S. V. Anakhov ◽  
B. N. Guzanov ◽  
A. V. Matushkin ◽  
N. B. Pugacheva ◽  
Yu. A. Pykin
Keyword(s):  
Plasma Torch ◽  
Plasma Cutting ◽  
Air Plasma ◽  
Torch Design

Treatment of steel by an air-plasma ARC with scanning

1999 ◽  
Vol 41 (1) ◽  
pp. 12-15 ◽  
Author(s):  
Yu. M. Dombrovskii ◽  
A. V. Brover
Keyword(s):  
Plasma Arc ◽  
Air Plasma

Kinetics of heating steel with a scanning air-plasma arc

1999 ◽  
Vol 13 (5) ◽  
pp. 402-404 ◽  
Author(s):  
Yu M Dombrovskii
Keyword(s):  
Plasma Arc ◽  
Air Plasma ◽  
Kinetics Of

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.

Hybrid Induction Plasma Cutting Process - A New Technology for High Speed Metal Cutting

2014 ◽  
Author(s):  
Jerald E. Jones ◽  
Valerie L. Rhoades ◽  
Mark D. Mann ◽  
Todd Holverson
Keyword(s):  
Induction Heating ◽  
Plasma Torch ◽  
High Speed ◽  
Metal Cutting ◽  
New Technology ◽  
Cutting Process ◽  
Plasma Cutting ◽  
Air Plasma ◽  
Aircraft Carrier ◽  
Initial Development

A new cutting process, a hybrid system, uses induction heating to heat the metal ahead of the plasma cutting torch. The process has demonstrated the ability to plasma cut steel parts at speeds of up to 4X the speed of the plasma torch without the induction heating. Although the total heat input per unit time is greater, because of the increase in speed, the heat which is conducted into the cut pieces is less. This causes less potential metallurgical damage, less potential distortion, and reduced coating damage and reduced emissions during cutting, in comparison to the plasma cutting process without the induction heating. The initial development was primarily for use in cutting nuclear submarine and aircraft carrier hulls, for scrapping after decommissioning. The process has been demonstrated cutting steel plates and can be used in ship production as well. The primary motivation of the SBIR project was to reduce the heating of the cut pieces, in order to reduce the particulate matter (PM) emissions which occur when coated ship hull material is cut. An induction coil is positioned in front of the plasma cutting torch, to bring the material to an elevated temperature of at least 1600° F, before the plasma is applied to the metal surface. Induction heating testing has shown that the 35 kW induction system can maintain the 1600° F surface temperature at travel speeds of above 220 inches per minute on steel as thick as 3 inches. Once the steel is at that temperature an air plasma torch can cut the metal much faster than cutting cold steel.

scholarly journals Surface Functionalization of a Polyurethane Surface via Radio-Frequency Cold Plasma Treatment Using Different Gases

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1067 ◽  
Author(s):  
Aya E. Abusrafa ◽  
Salma Habib ◽  
Anton Popelka
Keyword(s):  
Plasma Treatment ◽  
Treatment Time ◽  
Polymer Surface ◽  
Peel Test ◽  
Maximum Plasma ◽  
Air Plasma ◽  
Temperature Plasma ◽  
Aging Study ◽  
Roughness Analysis ◽  
Gaseous Media

Herein, the surface treatment of polyurethane (PU) films via air, O2, N2, Ar, and their mixtures were tested. The treatment was performed to incorporate new polar functionalities on the polymer surface and achieve improved hydrophilic characteristics. The PU films were subjected to RF low-temperature plasma treatment. It was found that plasma treatment immensely enhanced the hydrophilic surface properties of the PU films in comparison with those of the pristine samples; the maximum plasma effect occurred for the PU sample in the presence of air plasma with treatment time of 180 s at nominal power of 80 W. The surface topography was also found to vary with plasma exposure time and the type of gas being used due to the reactivity of the gaseous media. Roughness analysis revealed that at higher treatment times, the etching/degradation of the surface became more pronounced. Surface chemistry studies revealed increased O2 and N2 elemental groups on the surface upon exposure to O2, N2, air, and Ar. Additionally, the aging study revealed that samples treated in the presence of air and Ar were more stable in comparison to those of the other gases for both the contact angle and peel test measurements.

Sign in / Sign up

Export Citation Format

Share Document