| Effect of weld microstructure on weld properties in A-TIG welding of titanium alloy |
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| 作者姓名： | 刘凤尧 杨春利 林三宝 吴林 苏生 |
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| 作者单位： | National Key Laboratory of Advanced Welding Production Technology，National Key Laboratory of Advanced Welding Production Technology，National Key Laboratory of Advanced Welding Production Technology，National Key Laboratory of Advanced Welding Production Technology，National Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology，Harbin 150001，China，Harbin Institute of Technology，Harbin 150001，China，Harbin Institute of Technology，Harbin 150001，China，Harbin Institute of Technology，Harbin 150001，China，Harbin Institute of Technology，Harbin 150001，China |
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| 基金项目： | Project(HIT .2 0 0 1.2 0)supportedbytheScientificResearchFoundationofHarbinInstituteofTechnologyandproject(LCO1714)supportedbytheScientificResearchFoundationofHeilongjiangProvince,China |
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| 摘 要： | 1 INTRODUCTIONTheactivatingTIGwelding (A TIG)wasfirstlydevelopedbyPatonWeldingInstitute ,Ukraine ,inthe 196 0s1,2 ] .Itisnotuntiltheendof 1990sthatA TIGweldinghasbeenwidelyresearchedinEuropeandUS ,forexample ,TWIandEWI3] .Thefluxes ,whichweredevelopedbyEWI ,havebeenappliedintheUSNavyshipbuildingindustry4 ] .Theprincipleofthistechniqueisthatathincoatingofactivatingfluxiscoatedonthesurfaceofthebasemetalbeforeweld ing .ComparedwiththeconventionalTIGwelding ,the penetrationca…
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Effect of weld microstructure on weld properties in A-TIG welding of titanium alloy |
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| LIU Feng yao,YANG Chun li,LIN San bao,WU Lin,SU Sheng.Effect of weld microstructure on weld properties in A-TIG welding of titanium alloy[J].Transactions of Nonferrous Metals Society of China,2003,13(4). |
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| Authors: | LIU Feng yao YANG Chun li LIN San bao WU Lin SU Sheng |
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| Abstract: | Conventional TIG welding is known as its low productivity and limited weld depth in a single pass. Activating TIG welding (A TIG) can greatly improve the penetration when compared with the conventional TIG welding. The effects of five kinds of activating fluxes with single component (NaF, CaF 2, AlF 3, NaCl or CaCl 2) on penetration, microstructure and weld mechanical properties during the TIG welding of titanium alloy Ti 6Al 4V were studied. Compared with the conventional TIG welding, the experimental results show that the fluxes can greatly improve the penetration at the same welding specifications. This is because of the constriction of anode spots and the change of surface tension grads. Among them the effect of flux NaF is the best in the weld tensile strength, and the effect of flux CaF 2 on the weld bend intension is the best. The appearance of inferior crystal grains and the structure of trident crystal grains are the main reasons that the performance of weld with fluoride is improved. These experimental results can be used as an aid for selecting suitable activating flux for titanium alloy. |
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| Keywords: | TIG welding activating flux penetration microstructure mechanical property |
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