Suppose your project specification strictly says: “All fillet welds to DIN 8570-B2, inspection by VT per DIN EN 13018.” You cannot simply say “we use ISO 5817 instead” without customer approval. Follow this workflow:
A: For 90% of weld imperfections, they are identical. ISO 5817 includes a few additional defect types (like hot cracks) and has slightly updated measurement methods. din 8570 b pdf