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high-voltage spark emission

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Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001728
EISBN: 978-1-62708-178-8
... are often designed to minimize molecular emission. Each of the four types of emission sources; arcs, high-voltage sparks, glow discharges, and flames; has a set of physical characteristics with accompanying analytical assets and liabilities. The article also discusses the applications of each type...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006640
EISBN: 978-1-62708-213-6
... in the kinetic or internal energy of colliding species and therefore displays sharp variations as the chemical composition of the excitation region changes. Spark Sources The high-voltage spark is by far the most commonly used source for analysis of solid metal alloy samples, and it is also one...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001737
EISBN: 978-1-62708-178-8
... mixed with a conductive matrix. A high-voltage spark in a vacuum produces positive ions of the sample material that are extracted into a mass spectrometer and separated according to their mass. The spectrum is recorded on a photographic plate or measured using an electronic ion detector. The position...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001487
EISBN: 978-1-62708-173-3
...; that is, droplets are deposited during short circuits between the electrode and molten weld pool. As the current or voltage is increased, metal transfer changes to globular type, where large globules of metal are projected across the arc into the weld pool. At high currents, transfer changes to a spray mode, where...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005590
EISBN: 978-1-62708-174-0
.... This helps to simplify making output settings. Fig. 15 Advanced 300 A, alternating current/direct current inverter for gas tungsten arc welding High Frequency In GTAW, the term high frequency can have dual-usage meanings: The imposition of a separate high-frequency spark...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006545
EISBN: 978-1-62708-290-7
... material also plays an important role in defining the thermal and electrical characteristics of the arc. The arc behavior can be strongly impacted by electromagnetic effects resulting from the high current and charge density within the process. In this plasma, the voltage between the electrodes creates...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005635
EISBN: 978-1-62708-174-0
... and explosion. adhesive bonding arc welding brazing compressed gas cutting electrical safety electromagnetic radiation electron beam welding explosion prevention explosion protection explosion welding fire prevention fire protection friction welding fumes gas high-frequency welding laser...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0005692
EISBN: 978-1-62708-178-8
... in the intensity of the beam ac noncapacitive arc. A high-voltage elec- of the response to measurement (for ex- (light, x-rays, electrons, and so on) when trical discharge used in spectrochemical ample, emission, absorbance, and con- passing through matter. In many cases analysis to vaporize the sample material...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001053
EISBN: 978-1-62708-161-0
... identification technique that is indispensable for most processors. A piece of scrap is ground on a high-speed abrasive grinding wheel to produce sparks. A stationary wheel can be used to grind small items, while portable wheels can be used for larger items. The sparks are generated when the abrasive wheel tears...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0005693
EISBN: 978-1-62708-178-8
... spectroscopy PGAA prompt gamma-ray activation analysis PIXE particle-induced x-ray emission RBS Rutherford backscattering spectrometry RDF radial distribution function (analysis) RHEED reflection high-energy electron diffraction SAD selected-area diffraction...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006759
EISBN: 978-1-62708-295-2
... maintenance, including assurance that adequate calibrations have been upheld. Methods such as x-ray fluorescence (XRF), arc or spark optical emission spectroscopy (OES), and inductively coupled plasma OES (ICP-OES) can be considered quantitative methods. To obtain optimal quantitative results, the sample...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001729
EISBN: 978-1-62708-178-8
.... However, one significant advantage of the ICP over flame and arc-spark techniques is the great reduction, due to high temperatures and inert argon atmosphere, in background emission arising from flame gases, combustion products, and molecular species. Vaporization-Atomization Interference...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005791
EISBN: 978-1-62708-165-8
... Ionization Region When voltage is first applied to a gas and increased, the electrons within that gas can be charged to the point where an electrical ignition of the gas will occur. This can be likened to the spark that occurs when an automobile spark plug is charged with high voltage. The air...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006748
EISBN: 978-1-62708-213-6
.... The curve is gener- and can result from design, execution, or ac noncapacitive arc. A high-voltage electri- ated by measuring the responses for both. cal discharge used in spectrochemical analy- standards of known concentration. Also sis to vaporize the sample material. See also termed standard curve...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006647
EISBN: 978-1-62708-213-6
... it, and isolate it from the torch ( Ref 8 ). To ignite the plasma, a short pulse of a very high voltage is required. This pulse is provided by a Tesla coil, which produces high-voltage, low-current, and high-frequency alternating current density. The brief Tesla discharge must be generated to supply the argon...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005731
EISBN: 978-1-62708-171-9
... an electric arc or spark, a direct-current argon plasma, an inductively coupled argon plasma (ICAP), or a laser. Having selected the source, the emission spectrum is focused onto the spectrometer entrance slit. The light derived from the vaporized, excited material is dispersed into its component parts...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003194
EISBN: 978-1-62708-199-3
... or a wire saw. Use of cutter offset control permits several sizes to be cut from the same NC tape. The cutting accuracy is high because the spark erosion emanates from a fresh, constant-size section of wire. More detailed information on the processes summarized here, as well as other nontraditional...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006641
EISBN: 978-1-62708-213-6
... insertion ( Ref 3 , 4 ), electrothermal vaporization ( Ref 5 ), high-voltage spark ( Ref 6 ), laser ablation ( Ref 7 ), and many other approaches. Laser ablation is by far the most versatile, widely used direct solid-introduction technique. Laser ablation involves the conversion of a solid material...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003026
EISBN: 978-1-62708-200-6
... breakdown is a primary cause of failure of coatings used to provide insulation in high-voltage applications. In the breakdown process, mobile electrons acquire energy by acceleration in an electric field and then transfer the energy to other mobile or trapped carriers, or to the lattice by dissipative...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005924
EISBN: 978-1-62708-166-5
.... (Some current source power supplies do this in one step.) Radio-frequency (oscillator or vacuum tube) power supplies use a transformer to change the input voltage to high voltage before conversion to dc. The oscillator tube is used to produce dc pulses that are likewise changed into high-frequency ac...