Fatigue strength of transverse attachment steel joints with single-sided arc weld using low transformation temperature welding consumable

Hanji, Takeshi; Tateishi, Kensuke; Kano, Suguru; Shimizu, Masaru; Tsuyama, Tadahisa; Takebuchi, Toshio

doi:10.1007/s40194-020-00915-1

Cited by 9 publications

(1 citation statement)

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“…The LTT alloys exploit the plasticity associated with displacive transformation in order to offset thermal contraction strain, thus mitigating the tensile residual stress around the weld zone [ 10 , 11 ]. Due to tensile residual stress mitigation, numerous studies have shown that LTT alloys can significantly enhance the fatigue performance of welded joints [ 12 , 13 , 14 ]. Additionally, the LTT alloys were combined with TIG dressing for the further improvement of the fatigue strength [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Residual Stress in a Multi-Pass T-Welded Joint Using Low Transformation Temperature Welding Wire

Feng

Tsutsumi

et al. 2021

Materials

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We investigated whether low transformation temperature (LTT) welding materials are beneficial to the generation of compressive residual stress around a weld zone, thus enhancing the fatigue performance of the welded joint. An experimental and numerical study were conducted in order to analyze the residual stress in multi-pass T-welded joints using LTT welding wire. It was found that, compared to the conventional welded joint, greater tensile residual stress was induced in the flange plate of the LTT welded joints. This was attributed to the reheat temperature of the LTT weld pass during the multi-pass welding. The formerly-formed LTT weld pass with a reheat temperature lower than the austenite finish temperature converted the compressive residual stress into tensile stress. The compressive residual stress was generated in the regions with a reheat temperature higher than the austenite finish temperature, indicating that LTT welding materials are more suitable for single-pass welding.

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