Study of Weld Cracking Detectability on JIS G4404-SKD 11 Cold Work Steel Using Eddy-Current Testing

Abstract:

This research focuses on studying weld cracking adjacent to a drilled hole edge in tool and die repair, as well as evaluating the inspection sensitivity of eddy current testing (ECT). The weld cracking near the drilled hole edge was simulated using the Tungsten Inert Gas (TIG) welding process on SKD11 steel machinery components. The weld characteristics were designed as spot welds using a U-bending type simulation, considering factors influencing cracking, such as residual stress levels of 154 MPa and 220 MPa, and welding durations of 3 and 6 seconds. Cracking was investigated using penetrant testing and eddy current testing methods. The results revealed that weld cracking occurred under all experimental conditions. Penetrant testing effectively identified the surface appearance of cracks, while eddy current testing was used to assess crack depth. The maximum weld crack depth, approximately 1.08 mm, was observed under a residual stress level of 220 MPa and a welding time of 6 seconds. The amplitude signals detected by eddy current testing closely matched those of a reference standard block of the welded part, demonstrating its accuracy in crack depth assessment. These important findings found the significance of residual stress and welding duration in weld cracking and the utility of eddy current testing for detecting and evaluating weld crack characteristics.

• Periodical: Solid State Phenomena (Volume 378)
• Pages: 23-30
• DOI: https://doi.org/10.4028/p-w1Eb6m
• Online since: October 2025
• Authors: Somchai Wonthaisong*, Rittichai Phaoniam, Jakkapan Chara, Jesada Kaewwichit
• Keywords: Eddy-Current Testing, Residual Stress Level, SKD 11 Steel, Weld Cracking

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