Journal of Failure Analysis and Prevention

, Volume 11, Issue 6, pp 618–623 | Cite as

Assessment of Weld Embrittlement in A516 Steel Due to Multiple Repair Welds

Case History---Peer-Reviewed
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Abstract

A 3-million gallon petroleum storage tank was fabricated in the Midwest using A516 steel. The initial fabrication schedule had become compressed; welders worked hurriedly and did not produce good welds. Numerous welds had to be repaired via grinding and rewelding. The quality of the steel near the welds were questioned regarding their ductility; it was thought that the material had become embrittled and would fail prematurely in a catastrophic manner and be more susceptible to poor performance during the winters (−25 °F) because of welds being repaired up to six (6) times. The contracting company requested that the repair welds be evaluated and compared to the base metal and the original welds. The repair welds could not be removed from the structure. Therefore, the welding vendor was requested to provide mock-up welds and mock-up repair welds that simulated the welding process used during fabrication. The welding vendor provided base metal, mock-up of in-service weld, and mock-up of in-service repair weld for metallographic evaluation and mechanical testing. The vendor also provided hardness data for in-service weld and in-service repair weld along with hardness data for mock-up of in-service weld and mock-up of in-service repair weld. The mock-up welds adequately represent the production welds (original welds and repaired welds). All the test results indicate that the repaired welds are of similar quality as the original weld.

Keywords

Brittle Embrittlement Evaluation Ferrous metals Fracture toughness Heat-affected zone Weld repair 

References

  1. 1.
    Vega, O.E., et al.: Effect of multiple repairs in girth welds of pipelines on the mechanical properties. Mater. Charact. 59, 1498–1507 (2008)CrossRefGoogle Scholar
  2. 2.
    Plate A516 and A387 Pressure Vessel Steels: A Technical Overview. www.arcelormittal.com/plateinformation/documents/en/Inlandflats/ProductBrochure/ARCELORMITTAL%20PRESSURE%20VESSEL.pdf. Accessed 20 Oct 2009

Copyright information

© ASM International 2011

Authors and Affiliations

  1. 1.Reitz ConsultingFargoUSA

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