| SiO2增加铝合金交流A-TIG焊熔深的机理 |
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| 引用本文： | 黄勇,樊丁.SiO2增加铝合金交流A-TIG焊熔深的机理[J].焊接学报,2008,29(1):45-49. |
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| 作者姓名： | 黄勇 樊丁 |
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| 作者单位： | 兰州理工大学,有色金属新材料国家重点实验室,兰州,730050 |
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| 基金项目： | 国家重点实验室基金
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教育部春晖计划项目
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高等学校博士学科点专项科研项目 |
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| 摘 要： | 采用单组元活性剂进行铝合金交流A-TIG(Activating flux TIG)焊时,SiO2增加熔深最明显,对其增加熔深的机理进行了研究.进行正散焦真空电子束焊试验,SiO2对焊缝成形几乎没有影响;进行系列直流正接A-TIG焊试验,研究了活性剂对电弧的影响,发现SiO2使得氧化膜厚度增加,电弧极性区收缩,弧柱区扩展,电弧电压升高;进行氦气保护交流A-TIG焊试验,发现SiO2使活性剂或金属蒸发的区域变窄且蒸发量变小,熔池表面凹陷,并且在焊接过程中SiO2涂层始终存在于熔池表面,只在熔池凹陷中央区域出现很窄的裂缝,蒸气主要集中在电弧中下部.认为电弧极性区收缩和热输入增加是SiO2增加铝合金交流A-TIG焊熔深的主要机理.
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| 关 键 词： | SiO2 铝合金 交流A-TIG焊 熔深 |
| 文章编号： | 0253-360X（2008）01-0045-05 |
| 收稿时间： | 2007-03-26 |
| 修稿时间： | 2007年3月26日 |
Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy |
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| HUANG Yong and FAN Ding.Mechanism of weld penetration increased by SiO2 in AC A-TIG welding for aluminum alloy[J].Transactions of The China Welding Institution,2008,29(1):45-49. |
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| Authors: | HUANG Yong and FAN Ding |
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| Affiliation: | State Key Laboratory of New Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China and State Key Laboratory of New Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China |
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| Abstract: | 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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| Keywords: | SiO2 aluminum alloy alternating current activating- tungsten inert-gas welding weld penetration |
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