Low cycle fatigue of TIG butt-welded IN718 at 620°C

David W J Tanner, A. A. Becker, T. H. Hyde

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)


The procedure, results and analysis of a series of low cycle fatigue, uniaxial, transverse tests of PWHT, TIG butt-welded, thin-section IN718 plates at 620°C are presented. The results are compared with non-welded specimens and a previous study on welded samples, where weld bead excess was not removed and the welding process caused significant out-of-plane distortion. By linishing the weld bead excess and ensuring the welding procedure mitigated the distortion, the fatigue life of the welded specimens was increased and compared more closely with the corresponding non-welded specimen life. The lower fatigue strength of the welded specimens is attributed to the microstructural differences when compared with the non-welded material. A strain range life prediction method based on the Smith, Watson and Topper (SWT) parameter gave a good fit to both welded and non-welded test data.
Original languageEnglish
Title of host publicationSixth International Conference on Low Cycle Fatigue (LCF6)
Place of PublicationBerlin, Germany
Publication statusPublished - 2008


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