title: [Impact of introduction of O2 on the welding arc of gas pool coupled activating TIG].
abstract: In the present paper, Boltzmann plot method was applied to analyze the temperature distributions of the are plasma when the gas pool coupled activating TIG welding was at different coupling degrees with the outer gas being O2. Based on this study of temperature distributions, the changing regularities of are voltage and are appearance were studied. The result shows that compared with traditional TIG welding, the introduction of O2 makes the welding arc constricted slightly, the temperature of the are center build up, and the are voltage increase. When argon being the inner gas, oxygen serving as the outer gas instead of argon makes the are constricted more obviously. When the coupling degree increases from 0 to 2, the temperature of the are center and the are voltage both increase slightly. In the gas pool coupled activating TIG welding the are is constricted not obviously, and the reason why the weld penetration is improved dramatically in the welding of stainless steel is not are constriction.
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Yan-Lei
authors.initials: YL
authors.lastname: Wang
authors.forename: Zhi-Guo
authors.initials: ZG
authors.lastname: Zhang