Tuesday, March 28, 2017

Corrosive Chronicles (Green Theater) / Booth 2011

Corrosive Chronicles

Dissimilar Metal Welds: Test and Qualification Criterion for Subsea Service Under Cathodic Protection

10:15 a.m, to 11:15 a.m.

A recently developed test for ranking the susceptibility to Hydrogen Assisted Cracking (HAC) in dissimilar Metal Welds (DMWs) and a potential qualification criterion for subsea service under cathodic protection will be discussed, including:

  • Brief summary of major learnings on the HAC failure mechanism in DMWs and the major controlling factors.
  • Testing procedure, test sensitivity and reproducibility. Rankings of HAC susceptibility in Alloy 625 and low alloy steel butter DMWs. Effects of weld design, materials, welding and PWHT procedures. Comparison to the R-curves approach.
  • Optimizing PWHT parameters to maximize resistance of heat affected and fusion zones in DMW to hydrogen embrittlement.
  • Standardization of Test Method for Resistance to Environmentally-Induced Hydrogen Stress Cracking in Steel and Ni-based Alloy Welds. Ongoing effort within the NSF Manufacturing and Materials Joining Innovation Center and NACE.
  • Q&A session.

Presented by: Boian Alexandrov, The Ohio State University; Dean Hannam, Schlumberger; Elliott Turbeville, FMC Technologies

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