Fatigue crack initiation from defects at weld toes in steel

The mechanisms of fatigue initiation and microcrack growth at the toes of good quality manual and automatic T-plate welded joints in steel were investigated, using a compliance method to measure crack depth and closure levels, and three-stage ink staining, replica techniques and SEM microscopy to mo...

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Bibliographic Details
Published in:The International journal of pressure vessels and piping 1989, Vol.38 (5), p.385-417
Main Authors: Otegui, J.L., Kerr, H.W., Burns, D.J., Mohaupt, U.H.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Joining, thermal cutting: metallurgical aspects
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
Welding
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Summary:The mechanisms of fatigue initiation and microcrack growth at the toes of good quality manual and automatic T-plate welded joints in steel were investigated, using a compliance method to measure crack depth and closure levels, and three-stage ink staining, replica techniques and SEM microscopy to monitor crack growth. Minor undercuts, slag inclusions and surface spatter at the weld toes were detected as fatigue initiation sites in manual welds. Fatigue initiation in automatic welds was mainly associated with undercut-type defects. Details of their propagation and coalescence early in the fatigue process are documented. Delayed microcrack coalescence in the case of manual welds appears to be related to the more irregular toes of the manual welds, when compared to their automatic counterparts.
ISSN:0308-0161
1879-3541
DOI:10.1016/0308-0161(89)90048-3