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ISO 15156 - Weld Overlay - Interpretation

ISO 15156 - Weld Overlay - Interpretation

ISO 15156 - Weld Overlay - Interpretation

Just thought that I would test out the maintenance panel with a question on weld overlay that, by their comparable nature, will also be applicable to joining welds in CRA materials:

Further to the interpretation responses given to MP Inquiry #2013-02, is it to be taken that the heat treatment condition of the as deposited weld metal, that will also not comply with heat treatment requirements for certain materials listed in A.2 to A.11, will result in the same response, i.e. the cracking resistance is not addressed in the standard? If this is the case, should a note not be added to the standard to suggest to users that, if they are also seeking cracking resistance for the deposited weld overlay, then they should be looking to an Annex B methodology, or a documented field experience basis, to qualify the cracking performance?

Maintenance Panel Response:
“It is correct that NACE MR0175 / ISO 15156-3 does not address the cracking resistance for as-deposited materials, including impact of heat treatments.

If the Inquirer wishes to consider the overlay as a barrier for cracking resistance, a ballot is required to define cracking limits for a specific as-deposited composition for a defined location within the weld. Testing according to Annex B or the use of documented field experience according to NACE MR0175 / ISO 15156-1 clause 8.2 should be performed.
The addition of a note to the standard will require a ballot. The ballot form and instructions can be found at MR0175 / ISO 15156 Ballot Proposal Form.”

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.

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