Abstract
THE intensity of strong neutral argon emission lines radiated, by the thermally excited argon shield gas surrounding and within the central d.c. arc plasma of the Heliweld thoriated tungsten electrode welding arc has been measured. This arc was operated at 15 V and 135 amp (d.c.), providing a good source for thermally exciting neutral argon emission lines at a voltage below the ionization voltage (argon = 15.8 V).
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