Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy

	Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy
	Huang, Yong; Fan, Ding
	2008
发表期刊	Hanjie Xuebao/Transactions of the China Welding Institution
ISSN	0253360X
卷号	29 期号:1 页码:45-49
摘要	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.
关键词	Electron beam welding Evaporation Inert gas welding Silica Alternating current activating tungsten inert gas (AC ATIG) welding Weld penetration
收录类别	EI
语种	中文
出版者	Harbin Research Institute of Welding, No. 111 He-Xing Lu, Harbin, China
EI入藏号	20081111146733
EI主题词	Aluminum alloys
EI分类号	538.2.1 Welding Processes - 541.2 Aluminum Alloys - 802.3 Chemical Operations - 804.2 Inorganic Compounds
来源库	Compendex
分类代码	538.2.1 Welding Processes - 541.2 Aluminum Alloys - 802.3 Chemical Operations - 804.2 Inorganic Compounds
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/111877
专题	材料科学与工程学院
作者单位	State Key laboratory of New Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
第一作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
推荐引用方式 GB/T 7714	Huang, Yong,Fan, Ding. Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy[J]. Hanjie Xuebao/Transactions of the China Welding Institution,2008,29(1):45-49.
APA	Huang, Yong,&Fan, Ding.(2008).Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy.Hanjie Xuebao/Transactions of the China Welding Institution,29(1),45-49.
MLA	Huang, Yong,et al."Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy".Hanjie Xuebao/Transactions of the China Welding Institution 29.1(2008):45-49.