Improve the Fatigue Performance of Welded Joints with Undercuts by TIG Dressing Treatment

Abstract:

Undercuts often exists in the surface at weld toe. Undercuts affects the capability of weld subjected to dynamic loading greatly and fatigue cracks usually initiate from these zones with undercuts. Combining with low-alloy middle strength steel 16Mn，study of increasing the fatigue strength and the fatigue life was carried out. Compared with specimen without defects, the fatigue strength of specimen with undercuts has been increased by 10~20%. Study also shows that comparing with as-welded specimen with defects, with TIG dressing treatment, fatigue strength of cruciform weld joint of steel 16Mn has been increased by 70%, fatigue life by 5~8 times. Compared with as-welded specimen without defects, fatigue strength has been increased by 34%, fatigue life by 3~4 times. Undercuts have no adverse effects on fatigue property of welded joints under TIG dressing.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 1300-1304
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.1300
• Online since: February 2012
• Authors: Liang Chen Wu, Dong Po Wang
• Keywords: Fatigue Strength, TIG Dressing, Ultrasonic Peening, Undercut, Weld Toe

References

[1] R.Bell, O.Vosikovsky and S.A. Bain: Int.J.Fatigue, Vol. 11 (1989), p.9

[2] K.Iida, M.Sato and M.Nagai: Welding in the World, Vol. 39 (1997), p.262

[3] J.J. Janosch and S.Debiez: Welding in the World, Vol. 41 (1998), p.350

[4] H.Petershagen: Welding in the World, Vol. 7-8 (1990), p.432

[5] A.Hobbacher: Welding in the World, Vol. 39 (1997), p.272