En Iso 15614-7 Pdf

The standard ties the WPQR to specific filler metal classifications (e.g., ISO 14343 for stainless steels). Any change in filler metal chemical composition requires requalification unless it falls within the same classification and diameter range.

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The standard defines "essential variables"—parameters that, if changed beyond a certain range, require re-qualification. These include: The standard ties the WPQR to specific filler