| Improving the fatigue performance of longitudinal welded joints by low transformation temperature electrodes |
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| 作者姓名： | 王文先 霍立兴 王东坡 张玉凤 荆洪阳 杨新岐 |
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| 作者单位： | College of Materials Science and Engineering，Tianjin University，Tianjin，300072，College of Materials Science and Engineering，Tianjin University，Tianjin，300072，College of Materials Science and Engineering，Tianjin University，Tianjin，300072，College of Materials Science and Engineering，Tianjin University，Tianjin，300072，College of Materials Science and Engineering，Tianjin University，Tianjin，300072，College of Materials Science and Engineering，Tianjin University，Tianjin，300072 |
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| 基金项目： | NationalNaturalScienceFoundationofChina ( 5 0 175 0 79) |
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| 摘 要： | 0 IntroductionAfatigueisoneofthemainfailurescausesofweldedstructures.Manyexperimentshaveshownthatfatiguestrengthsofweldedjointsaremuchlowerthanthoseofbasemetal.Thefatiguecrackmainlyinitiatesatweldtoe ,becausetherearetensileresidualstressesandstressconcentrationinthisregion ,sothatthefatiguestrengthcanbeincreasedbybothmodifyingstressdistributionatweldtoeanddecreasingstressconcentration .Therearemanymethodstoimprovethefatiguestrengthsofweldedjoints1,2 ] ,forexample ,TIGdress ing,hammerpeenin…
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| 关 键 词： | 焊接 电极 LTTE 疲劳性能 纵向焊缝 |
Improving the fatigue performance of longitudinal welded joints by low transformation temperature electrodes |
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| Wang Wenxian,Huo Lixing,Wang Dongpo,Zhang Yufeng,Jing Hongyang and Yang Xinqi,College of Materials Science and Engineering,Tianjin University,Tianjin,..Improving the fatigue performance of longitudinal welded joints by low transformation temperature electrodes[J].China Welding,2003,12(1):34-38. |
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| Authors: | Wang Wenxian Huo Lixing Wang Dongpo Zhang Yufeng Jing Hongyang and Yang Xinqi College of Materials Science and Engineering Tianjin University Tianjin |
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| Affiliation: | College of Materials Science and Engineering, Tianjin University, Tianjin, 300072 |
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| Abstract: | For a longitudinal welded joint, the tensile residual stresses are as high as the yield stress of the metal, so that the weld toes are sensitive to fatigue load. In this case a low transformation temperature electrode (LTTE) is one of the most useful methods used to improve the fatigue strength of the longitudinal welded joint, because the tensile residual stress is reduced or changed into compressive stress. Three kinds of longitudinal welded joints were selected to conduct fatigue tests. The tests results show that the fatigue strengths at 2×106 cycles of the joints welded with LTTE were improved by 41%, 47% and 59% respectively compared with those of the joints welded with E5015, and the fatigue lives at 162 MPa were improved by 9.9 times, 9.6 times and 46.8 times respectively. Furthermore, the LTTE method is not necessary to add process after welding and so that it can be valuable method to improve the fatigue performance of longitudinal welded joints. |
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| Keywords: | fatigue performance longitudinal welded joints compressive residual stress low transformation temperature electrodes (LTTE) |
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