Temperature determinations in a free-burning arc. I. Experimental techniques and results in argon

Abstract

Spectroscopic techniques have been used to measure the temperature distribution in free-burning arcs in argon at 1 atm pressure. The experiment provides evidence for departures from LTE in the arc, and demonstrates deficiencies in the theory describing continuum emission from high temperature plasmas. This paper describes the apparatus and data reduction procedures and compares the measurements with recent theoretical calculations.

Effect of Anode Heat Transfer on Melted Penetration in Welding Process by Free-burning Argon Arc.

“…[1][2][3] Thus, understanding the relation among the temperatures of the arc plasma, the distributions of current and heat input on the anode, and the results is quite important for the materials processing by the free-burning arcs. However, experimental and theoretical investigations of the temperature of arc plasma, [3][4][5][6][7][8][9] the distributions of current and heat input, 10,11) and results, for example, the weld penetration [12][13][14][15][16] were separately conducted and the relation among them has not been made clear. For example, Nestor 10) measured the distributions of current and heat input on the anode of freeburning arc by using the water-cooled copper anode which consists of two separate blocks.…”

Measurement of dynamical variation in two-dimensional temperature distribution of TIG pulsed-arcs

“…2 and recorded as the two dimensional image by the high speed camera (Photron, FASTCAM-512PCI). The temperature distribution of TIG arc was calculated from the intensity distribution in the image through the Fowler-Milne method 1) . In this experiment, we used tungsten cathodes with the conical tip angles of 45 degrees and 60 degrees.…”

Quasi-neutrality and local thermodynamical equilibrium in atmospheric presure arc discharges

“…1 The atmospheric pressure arc plasma in argon has been studied by several authors with respect to important questions, as the attainment of Local Thermodynamical equilibrium (LTE) in part or the entirety of the arc column both experimentally and by numerical methods Farmer, 1984 and1986;Cram et al, 1988;Haidar, 1997;and Benilov, 1999).…”