Development of a novel pulsed arc system for precision plasma cutting
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Abstract:
The current pulsation is one of effective manners to contract and thus stiffen plasma cutting arc. The present work develops a novel pulsed arc system for precision plasma cutting, by paralleling the ultrasonic-frequency pulse generator with conventional plasma cutting power supply. The implementation of the system is introduced, and then its electrical and vibration characteristics are investigated in detail. Cutting experimental results finally show that the pulsed arc process can improve plasma cut quality obviously while increasing the electrode life, and thus demonstrate the effectiveness of the system.Keywords:
Plasma cutting
Electric arc
Plasma arc welding
Pulsed Power
Pulsed DC
The design and construction of STARFISH, a series of compact compact pulsed power generators to drive advanced z-pinch experiments, for applications such soft X-ray generation and as a high density plasma diagnostic, is being developed in Oxford. The design for these machines is based on the use of many very low impedance distributed pulse forming lines (PFLs) or discrete pulse forming networks (PFNs), connected in parallel, DC charged and switched simultaneously on to a load which may be a wire or laser pre-ionised channel. This generator avoids the use of very high voltage Marx generators, liquid insulated pulse forming lines and MITLs that are usually used in machines driving large z-pinch experiments. Consequently the generator is far more compact than conventional designs and should be operable at much higher repetition rates if laser pre-ionisation is used. The idea is to build a series of generators that can be operated routinely on a day-to-day basis, with pulse characteristics that can be “tailor-made” for specific loads, and be both efficient and reliable.
Pulsed Power
Z-pinch
Marx Generator
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Micro-arc oxidation coatings were prepared on AZ91D magnesium alloy using DC and pulsed DC power sources.The influence of the power source modes on the properties of the micro-arc oxidation coatings was investigated by means of microhardness testing,scanning electron microscopy,and polarization curve measuring,aiming at comparing the growth rate,microhardness,surface topography and corrosion resistance.It was found that the micro-arc oxidation coating prepared from the DC power source had a greater growth rate than that prepared from the pulsed DC power source,while the microhardness of the coatings was almost independent on the power source mode.Moreover,the micro-arc oxidation coating prepared from the pulsed DC power source had better surface topography and corrosion resistance than the one prepared from the DC power source,and high frequency pulsed DC power source was beneficial to improving the surface topography and corrosion resistance of the coatings.
Pulsed DC
Pulsed Power
Conversion coating
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The CNC plasma arc cutting is a kind of an economical,practical,efficient and advanced thermal cutting technology.Many parameters of mutual coupling,affects the cutting quality and cutting efficiency in the CNC plasma arc cutting process parameters,therefore,cutting parameter selection and control is a key and difficult issue.In this paper,we analysis the process technology for the CNC plasma arc cutting,and variety of parameters selection and optimal control for plasma arc cutting of the no-load voltage,arc column voltage,cutting current,cutting speed,working medium and the flow,the height of spray nozzle from the workpiece,nozzle diameter,pipette suliang,pilot arc of the arc parameters,and it obtain a good cutting quality,but also for the CNC plasma arc cutting applications,the reference in the recommendations and advice.
Plasma cutting
Plasma arc welding
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(2003). Plasma-arc cutting – a promising method of thermal cutting. Welding International: Vol. 17, No. 2, pp. 147-151.
Plasma cutting
Plasma arc welding
Cutting tool
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Citations (15)
The design and construction of STARFISH, a series of compact pulsed-power generators to drive advanced Z -pinch experiments, for applications such as soft X-ray generation and as a high-density plasma diagnostic, is being developed in Oxford. The design for these machines is based on the use of many very low impedance distributed pulse-forming lines (PFLs) or discrete pulse-forming networks, which are connected in parallel, dc charged, and switched simultaneously on to a load which may be a wire or laser-preionized channel. This generator avoids the use of very high voltage Marx generators, liquid-insulated PFLs, and magnetically insulated transmission lines that are usually used in machines driving large Z -pinch experiments. Consequently, the generator is far more compact than conventional designs and should be operable at much higher repetition rates if laser preionization is used. The idea is to build a series of generators that can be operated routinely on a day-to-day basis, with pulse characteristics that can be ldquotailor-maderdquo for specific loads, and be both efficient and reliable.
Pulsed Power
Z-pinch
Marx Generator
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In order to improve the cut quality in plasma arc cutting of plates with varying thicknesses, the intensity of the plasma arc exiting the bottom of the plate was measured using a photo darlington sensor, and the cutting speed was controlled to maintain the uniform intensity of the ejected plasma arc
Plasma cutting
Intensity
Plasma arc welding
Electric arc
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Citations (21)
Pulsed electron beam generation requires high power pulses of fast rise, short duration pulse with flat top. With this objective we have designed a low cost compact pulsed power driver based on water dielectric transmission line. The paper describes the design aspects and construction of the pulse power driver and its experimental results. The pulsed power driver consist of a capacitor bank and its charging power supply, high voltage generator, high voltage switch and pulse compression system.
Pulsed Power
High Voltage
Pulse duration
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The development of submicrosecond pulsed power in the U.K. and USA between 1960 and 1970 is described. Novel short-pulse (tens of nanoseconds) X-ray tubes driven by stacked solid dielectric striplines were devised at the Atomic Weapons Research Establishment, Aldermaston, U.K. for radiography. The importance of nuclear weapons effects simulation then motivated a very rapid development of new types of pulse generator in the USA to drive scaled-up tubes of this type. Prominent among these pulse generators were the Marx-driven liquid dielectric pulse lines that form the basis of many present-day pulsed power generators.
Pulsed Power
Nanosecond
Marx Generator
Electromagnetic pulse
Rise time
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Drilling is an important aspect of materials processing in industry. Conventional drilling methods cannot completely meet production needs. As a result, the emergence of many new processing methods has become a prominent trend in recent years. However, few reports have been published on drilling processes using plasma arc technology. Plasma arc technology has been applied in various engineering fields including welding, thermal cutting, and heat treatment. This study proposes the use of plasma arc technology as a drilling method. A plasma arc drilling system was set up and a number of experiments were carried out. The geometrical characteristics and quality of holes generated using a plasma arc were analyzed. Various hole shapes were obtained by plasma arc drilling; namely, a conical blind hole, a taper hole, a cylinder hole, and a reverse taper hole. Variations in the volume of removed material and the material removal rate (MRR) of plasma arc drilling were investigated. The experimental results have verified that plasma arc drilling is an effective and high-speed drilling method.
Plasma cutting
Plasma arc welding
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Citations (4)