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high-velocity gas stream

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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002156
EISBN: 978-1-62708-188-7
... Abstract Abrasive jet machining (AJM) is a process that removes material from a workpiece through the use of abrasive particles entrained in a high-velocity gas stream. This article discusses the operation of principal components, advantages, and disadvantages of the AJM system. It describes...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005714
EISBN: 978-1-62708-171-9
... schematically in Fig. 2 . The deformable powder particles are accelerated to high velocities by injection into a high-velocity gas stream. A converging/diverging nozzle is used to develop the high-velocity gas stream. Various terms—including kinetic energy metallization , kinetic spraying , high-velocity...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003655
EISBN: 978-1-62708-182-5
...: Corrosion Monitoring of Piping with High-Velocity Gas Streams High-velocity gas streams in pipes may cause problems with conventional monitoring systems. In this case, the presence of an aqueous phase is usually restricted to a thin layer on the surface of the pipe. A probe that protrudes into the pipe...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003194
EISBN: 978-1-62708-199-3
.... Two processes involved: chemical milling, chemical blanking Fine abrasive particles carried in a high velocity gas stream are used to machine and grind materials Equipment Chemical milling: Large or small, thick parts; masking facilities, corrosion resistant processing tanks and fixtures, vented...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003284
EISBN: 978-1-62708-176-4
... to high confidence in the measured erosion value, and in this case, a single test in which the specimen was exposed to 300 g of erodent would have yielded essentially the same erosion rate. Fig. 15 Typical erosion data from tests in a gas-blast rig with 300–425 μm olivine sand particles. (a) Mild...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006084
EISBN: 978-1-62708-175-7
... atomized. Confined designs are of two types: conventional ( Fig. 14 , right image) and ultrasonic ( Fig. 15 ). The ultrasonic design uses the Hartman tube principle to apply high-frequency pulsation to the gas stream, with gas exit velocities reported to be Mach 2 to 2.5 and the major pulsation...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005718
EISBN: 978-1-62708-171-9
... with the high temperature of combustion, creates gas velocities in the 1525 to 1825 m/s (5000 to 6000 ft/s) range at the nozzle exit. Common HVOF fuel gases include hydrogen, propylene, propane, acetylene, and kerosene. It is important to note that there are two distinct classes of high-velocity combustion...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005738
EISBN: 978-1-62708-171-9
... in Winterthur, Switzerland The rig uses a high-velocity gas stream to heat the abradable specimen to the required temperature. Test blades are mounted on a turbine disc that can produce blade tip speeds of up to 500 m/s (1640 ft/s). A stepper motor allows the controlled movement of the abradable test...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005725
EISBN: 978-1-62708-171-9
...-velocity oxyfuel X X Detonation gun X X Cold spray X X (a) Particle speed ranges from a high of approximately 1000 m/s (3000 ft/s) to a low of 25 m/s (80 ft/s). Further variations within each process depend on the particle size, material type, and gas velocity...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005706
EISBN: 978-1-62708-171-9
... Cold spray is a material deposition process in which coatings are applied by accelerating powdered feedstocks of ductile metals injected into a high-pressure gas (usually nitrogen or helium) stream expanding through a supersonic nozzle. Particle velocities of 300 to 1100 m/s (1000 to 3600 ft/s...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001335
EISBN: 978-1-62708-173-3
... photograph of streaming transfer mode in gas-metal arc welding of steel Fig. 6 Short-circuiting transfer mode in gas-metal arc welding of steel. (a) Schematic showing transfer of electrode material by surface tension of weld pool onto cathode base metal. (b) High-speed photograph of material...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005621
EISBN: 978-1-62708-174-0
.... 6 High-speed photograph of streaming transfer mode in gas metal arc welding of steel Fig. 7 Short-circuiting transfer mode in gas metal arc welding of steel. (a) Schematic showing transfer of electrode material by surface tension of weld pool onto cathode base metal. (b) High-speed...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003659
EISBN: 978-1-62708-182-5
... in the case of pilot plant operation, in which wide variations in processing conditions are encountered. It is also helpful in plants that produce different products in the same equipment. High-velocity gas streams in pipes may cause problems with conventional monitoring systems. In this case...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006419
EISBN: 978-1-62708-192-4
... particles up to v P >1000 m/s (3280 ft/s) in a compressed-gas jet ( Fig. 10 ). The use of gas pressures ( p gas ) up to 4 MPa (0.6 ksi) results in very high particle velocities. Compared with other thermal-spray processes, particles inside the spray stream remain solid. The electrical heat source...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003179
EISBN: 978-1-62708-199-3
... an extremely high-temperature, high-velocity, constricted arc between an electrode contained within the torch and the piece to be cut. The arc is concentrated by a nozzle onto a small area of the workpiece. The metal is continuously melted by the intense heat of the arc and then removed by the jetlike gas...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001086
EISBN: 978-1-62708-162-7
... manufactured by this process are loaded into a die for consolidation, the flat surfaces align and give rise to areas of preferred orientation. The impact-grinding process, which relies upon a high-velocity gas stream to accelerate beryllium particles and drive them against a beryllium target, activates...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005707
EISBN: 978-1-62708-171-9
... that usually involves the interaction of a gaseous phase with a surface. An elevated-temperature environment usually accelerates the process. A classic example is the protection of gas turbine components from attack by oxygen at high temperatures through the use of coatings containing aluminum. The substrates...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003817
EISBN: 978-1-62708-183-2
... on the environmental cracking resistance of the cobalt alloys. Three welding processes that are used for hardfacing with the high-carbon Co-Cr-W alloys, namely, oxyacetylene, gas tungsten arc, and plasma-transferred arc are also discussed. The article examines the effects of various modes of high-temperature corrosion...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001334
EISBN: 978-1-62708-173-3
... Abstract High-velocity gas motion occurs in and around the arc during welding. This article describes the phenomena of gas flow in gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). The effect of trace element impurities on GTA weld penetration of selected alloys is presented...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005197
EISBN: 978-1-62708-187-0
.... However, during the melting process, the cupola emits considerable amounts of smoke and particulate matter. Known as emissions, this waste gas stream is now cleaned to meet the highest environmental standards, but this has required much engineering effort and considerable expense. With environmental laws...