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HUANG Yong, FAN Ding. Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (1): 45-49.
Citation: HUANG Yong, FAN Ding. Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (1): 45-49.
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Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy

  • State Key Laboratory of New Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China

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  • Received Date: March 25, 2007
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  • The weld penetration increased by SiO2 is the most obviously when some single-component fluxes are used as surface activating flux in AC A-TIG(alternating current activating-tungsten inert- gas)welding of aluminum alloy.The mechanism of SiO2 increasing weld penetration of AC A-TIG welding was studied.SiO2 has little effect on weld appearance of electron beam welding with positive defocus.A series of DCSP A-TIG welding experiments were carried out to investigate the effects of SiO2 on welding arc.It is found that SiO2 can constrict arc polarity area, broaden arc column and improve arc voltage.AC A-TIG welding with helium shielding gas was carried out.It is found that SiO2 constricts evaporation area, weakens evaporation of activating flux or base metal, and depresses weld pool surface.During the welding process, SiO2 coating is always on the weld pool surface.Only there is very narrow gap on the central region of depressed weld pool.Vapor concentrates in the lower middle part of arc.The results indicate that arc polarity area constriction and input heat increase are the main mechanism to increase weld penetration by SiO2 in AC A-TIG welding for aluminum alloy
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