1. Gurebich S M, Zamkov V N, Kushnirenko N A. Improving the penetration of titanium alloys when they are welded by argon tungsten arc process. Automat Weld, 1965, 18(9): 1–5
2. Tanaka M, Shimizu T, Terasaki T, et al. Effects of activating flux on arc phenomena in gas tungsten arc welding. Science and Technology of Welding and Joining, 2000, 5(6): 397–402
3. Simonik A G. The effect of contraction of the arc discharge upon the introduction of electro-negative elements. Welding Production, 1976, (3): 49–51
4. Heiple C R, Roper J R. Mechanism for minor element effect on GTA fusion zone geometry. Welding Journal, 1982, 61(4): 97–102
5. David S A, Debroy T, Vitek J M. Phenomenological modeling of fusion welding processes. MRS Bulletin, 1994, 19(1): 29–35