溶接パスの積層順序の制御による残留応力低減および疲労強度向上法

概要

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The effects of residual stress on fatigue strength at a weld toe in multi-pass fillet-welded joints were evaluated. The residual stresses in the specimen were varied by controlling the sequence of welding passes. The residual stress at the weld toe was 80 MPa in the specimen whose last welding pass was on the main plate, but it was 170 MPa in the specimen whose last pass was on the attachment. The fatigue strength of the specimens was nearly the same at high stress amplitude, but the fatigue strength of the specimen whose last welded pass on the main plate was larger than that of the other specimen at low stress amplitude. This difference is due to the magnitude of the initial residual stress and the relaxation of the residual stress under the cyclic loading. The effects of the residual stress were shown in the modified Goodman diagram, in which residual stress is treated as a mean stress.
社団法人日本機械学会の論文
1998-10-25