Abstract
This is a study of the suitability of preheat flame electrical resistance as a potential method for measuring the standoff distance an oxyfuel cutting torch and a work piece. Careful scrutiny of forty-seven individual experiments demonstrate that when cut quality is good, there is a linear repeatable relationship between the two with uncertainty about ±0.3 mm (0.015 in.). As the cut quality degrades, the formation of top-edge dross reduces the electrical path length in the flame, and momentary reduction in the reaction rate in the kerf reduces the free electrons in the flame, causing increases in flame resistance. In these conditions, measurement uncertainty reduces to ±1 mm (0.040 in.) or worse.
Issue Section:
Research Papers
References
1.
Martin
, C.
, Leonard
, C.
, and VonFricken
, J.
, 2017
, “A Study of the Electrical Characteristics of An Oxy-Fuel Flame
,” Exp. Therm. Fluid. Sci.
, 88
(3
), pp. 65
–72
. 2.
Pond
, T. L.
, and Martin
, C. R.
, 2020
, “Electrical Characteristics of the Oxyfuel Flame While Cutting Steel
,” Exp. Therm. Fluid. Sci.
, 112
(4
), p. 109985
. 3.
Messer, Sensomat-Pan, https://us.messer-cutting.com/static/906eff06790ec5add88ec42572cb8ea4/Sensomat_Pan_01.pdf, Accessed January 26. 2021.
4.
Calcote
, H. F.
, 1961
, “Ion Production and Recombination in Flames
,” Eighth Symposium on Combustion
, Pasadena, CA
, Aug. 28
, Vol. 8, Combustion Institute, pp. 184
–199
.5.
Bradley
, D.
, and Ibrahim
, S. M. A.
, 1974
, “Determination of Positive-Ion Mobilities and Collision Cross Sections in Flame Gases Using Electrostatic Probes
,” J. Phys. D: Appl. Phys.
, 7
(10
), pp. 1377
–1390
. 6.
Clements
, R. M.
, and Smy
, P. R.
, 1969
, “Electrostatic-Probe Studies in a Flame Plasma
,” J. Appl. Phys.
, 40
(11
), pp. 4553
–4558
. 7.
Clements
, R. M.
, and Smy
, P. R.
, 1970
, “Ion Current to a Spherical Probe in a Flowing High-Pressure Plasma Under Thin-Sheath Conditions
,” Proc. IEE
, 117
(8
), pp. 1721
–1724
.8.
Mott
, C.
, Chouinard
, A.
, and Harding
, R.
, 1944
, “Torch Device
,” US Patent 2,364,645, National Cylinder Gas Co. 266/23.9.
Martin
, C. R.
, 2018
, “A Study of Ion Currents in an Oxyfuel Flame Due to Work Surface Chemical Action
,” Exp. Therm. Fluid. Sci.
, 98
(5
), pp. 239
–250
. 10.
Martin
, C.
, 2017
, “Replacing Mechanized Oxyfuel Cutting Sensors With Ion Current Sensing
,” Proceedings of the ASME 2017 Manufacturing Science and Engineering Conference
, Paper No. MSEC2017–2789.11.
Martin
, C.
, 2018
, “Electrical Signatures for Chemical Action at the Work Surface in an Oxyfuel Flame
,” Proceedings of the ASME 2018 Manufacturing Science and Engineering Conference
, Paper No. MSEC2018–6354
.12.
Martin
, C. R.
, Pond
, T.
, Tomas
, J.
, Schmit
, J.
, Miguel
, E.
, Untaroiu
, A.
, and Xu
, K.
, 2020
, “Semiconductor Aspects of the Oxyfuel Cutting Torch Preheat Flame, Part I: Measurements Between Torch and Work
,” Proceedings of the Manufacturing Science and Engineering Conference
, Cincinnati, OH
, June 21
.13.
Martin
, C. R.
, Untaroiu
, A.
, and Xu
, K.
, 2020
, “Spatially Resolved Ion Density Measurements in an Oxyfuel Cutting Flame
,” Combust. Sci. Technol.
, pp. 1
–16
. 14.
Martin
, C.
, Untaroiu
, A.
, and Xu
, K.
, 2020
, “A One-Dimensional Model for Ion Transport in a Flame with Two Absorbing Surfaces
,” Combust. Theory Model.
, 25
(1
), pp. 22
–43
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