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This is a Experimental Study study.

Improvement of Fatigue Strength and Evaluation of Nondamaging Crack Size in High-Tensile Strength Steel Welded Joints by Needle Peening

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Needle peening enhances fatigue limit in welded joints, suggesting improved industrial reliability of high-strength steel.

Needle peening increased the fatigue limit of welded joints with a crack depth of less than 1 mm.
Evaluation revealed a maximum nondamaging crack depth of 1.31 mm despite the limit of 1 mm through peening.
Analysis utilized three-point bending fatigue tests uniting findings on fatigue limit and residual stress.
These insights may enable broader industrial application of high-strength steel by enhancing joint reliability.

Dae-Hoon Shin (2025) studied this question.

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