2Kazakov Y V, Koryagin K B and Potekin V P. Effect of activating fluxes on penetration in welding steels thicker than 8 mm[J]. Weld- ing International, 1991(5) : 202-205.
3Howse D S, Lucas W. Investigation into arc constriction by active fluxes for tungsten inert gas welding[J]. Science and Technology of Welding and Joining, 2000, 15(3): 189-193.
4Leeontel S, Paillard P and Chapelle P. Effect of oxide fluxes on activation mechanisms of tungsten inert gas process [J]. Science and Technology of Welding and Joining, 2006, 11 (4): 389-397.
5Liming Liu, Zhaodong Zhang, Gang Song, et al. Effect of cadmi- um chloride flux in active flux TIG welding of magnesium alloys[J]. Materials Transactions, 2006, 47(2): 446-449.
6Gurevich S M, Zamkov V N and Kushnirenko. Improving the pene- tration of titanium alloys when they are welded by argon tungsten arc process[J]. Avtom. Svarka N A, 1965(9): 1-4.
7Simonik A G. The effect of constraction of the arc discharge upon the introduction of electro-negative elements [J]. Welding Produc- tion, 1976(3): 49-51.
8Heiple C R, Roper J R. Mechanism for minor element effect on GTA fusion zone geometry[J]. Welding Journal, 1982, 61 (4) : 97-102.
9Lucas W, Howse D. Activating flux increasing the performance and productivity of the TIG and plasma processes[J]. Weld Met Fabr, 1996, 64(1): 11-17.