1-20 of 315 Search Results for

arc emission

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Image
Published: 15 January 2021
Fig. 2 Example of burn marks left behind after arc/spark optical emission spectroscopy, illustrating how this technique is destructive to the surface. Courtesy of J. Sampson, NASA More
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: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001336
EISBN: 978-1-62708-173-3
... shape and shielding gas composition in the GTAW process. arc welding cathode tip shape electron discharge gas tungsten arc welding heat transfer nonthermionic emission shielding gas composition thermionic emission THE GAS-TUNGSTEN ARC WELDING (GTAW) process is performed using a welding...
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
... by inductively coupled plasma. The article “Inductively Coupled Plasma Optical Emission Spectroscopy” in this Volume is devoted to this widely used, very powerful technique. Arc Sources The term arc describes various electrical discharges; this description is limited to the direct current (dc) arc...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005664
EISBN: 978-1-62708-174-0
..., the emission moves to a new location that has a high enough oxide content to sustain the discharge of electrons. The arc root or cathode spot where the emission occurs is highly mobile in ac or DCEP and, as a result, the arc is much less stable than in DCEN. Gas Shielding In all cases, the arc and both...
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
... Abstract Fusion-based additive manufacturing (AM) processes rely on the formation of a metallurgical bond between a substrate and a feedstock material. Energy sources employed in the fusion AM process include conventional arcs, lasers, and electron beams. Each of these sources is discussed...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005205
EISBN: 978-1-62708-187-0
... high current densities are required. The cathodes are usually made of tungsten, along with small additions of thoria to lower the thermionic work function of tungsten. Still, electron emission requires high electrode temperatures (3500 to 6000 K, or 5800 to 10,300 °F) at the attachment of the arc...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001482
EISBN: 978-1-62708-173-3
... at the gas-tungsten arc at the melting point of the metals welded. Hunter, Allemand, and Eager ( Ref 54 , 55 ) developed techniques for temperature measurement using multiwavelength pyrometry to alleviate the emissivity variation problem. However, so far the only proof of the concept was demonstrated...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005553
EISBN: 978-1-62708-174-0
... for differences in the thermal emissivity of the workpiece. In GTAW, accurate IR temperature measurements can be further hampered by interfering radiation from the arc and the tungsten electrode ( Ref 72 ). Finally, unlike IR sensors, which typically have a fast response time, contact temperature transducers...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003250
EISBN: 978-1-62708-199-3
... Abstract The overall chemical composition of metals and alloys is most commonly determined by X-ray fluorescence (XRF) and optical emission spectroscopy (OES), and combustion and inert gas fusion analysis. This article provides information on the capabilities, uses, detection threshold...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0005586
EISBN: 978-1-62708-170-2
... temperatures in steel AEM analytical electron microscope/microscopy AES Auger electron spectroscopy; acoustic emission spectroscopy AESF American Electroplaters and Surface Finishers Society AFM atomic force microscope AG aged; alternating grinding AGMA American...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006454
EISBN: 978-1-62708-190-0
... Abstract Acoustic emission is the generation of stress waves by sudden movement in stressed materials. This article begins with a comparison of acoustic emission from most other nondestructive testing (NDT) methods, and discusses the range of applicability of acoustic emission. It describes...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001732
EISBN: 978-1-62708-178-8
...-supplied spectral response curves, and solutions of appropriate standard fluorescent compounds. Wavelength Calibration Instrumental emission wavelength settings can be calibrated periodically using a standard source, such as mercury arc lamp. The mercury emission lines (first and second order) from...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001337
EISBN: 978-1-62708-173-3
... Abstract Power sources are apparatuses that are used to supply current and voltages that are suitable for particular welding processes. This article describes power sources for arc welding, resistance welding, and electron-beam welding. The more-common welding processes that use constant...
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: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005590
EISBN: 978-1-62708-174-0
... of the arc current is carried by positive gas ions that are attracted to the cathode, where they generate approximately 30% of the arc heat. The cathode loses heat by the emission of electrons, and this energy is transferred as heat when the electrons enter or interact with the anode. This is one reason why...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005717
EISBN: 978-1-62708-171-9
... 3 ), fumes and dust, and so on. Most of the hazards are, in part, proportional to jet energy and velocity, and these hazards are common to all devices and processes. At the upper end of the energy spectrum for these processes are hypersonic velocities and plasma-arc power levels of 720 MJ (200 kW...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0005663
EISBN: 978-1-62708-173-3
... in crystal structure; speed of DIN Deutsche Industrie-Normen (German In- AAR Association of American Railroads light; specific heat; constant dustrial Standards) C cementite; coulomb; heat capacity DPH diamond pyramid hardness AASHTO American Association of State CAC carbon arc cutting DRA discontinuously...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006592
EISBN: 978-1-62708-210-5
... aluminum. The reflectivity of 1100 aluminum as a function of aluminum oxide coating thickness and emissivity of 1100 aluminum foil as a function of coating thickness are illustrated. aluminum alloy 1100 aluminum alloy 1100A aluminum foil aluminum oxide coating coating thickness commercially pure...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005708
EISBN: 978-1-62708-171-9
... (e.g., Zn15Al) or aluminum/magnesium (e.g., Al5Mg) coatings with thicknesses of 80 to 120 μm (3 to 5 mils) and 200 to 350 μm (8 to 14 mils), respectively ( Ref 3 ). Plain aluminum (99.5% Al) coatings with thicknesses of 150 to 200 μm (6 to 8 mils) also are used. They are deposited by electric arc wire...