Iso 17637 Pdf !link!

standard, titled " Non-destructive testing of welds — Visual testing of fusion-welded joints

There — just beneath the toe of the weld, running parallel to the joint — a hairline crack. Not yet open to the surface, but visible under magnification. The standard’s Table 2 was explicit: any crack, regardless of size, is unacceptable for Class B. iso 17637 pdf

| Standard | Scope | Key Difference | |----------|-------|----------------| | | Fusion welds in metals | Global standard; references ISO 5817 | | AWS D1.1 | Structural steel welding | US-centric; has its own visual acceptance criteria | | ASME Section V | Pressure vessel and piping visual exam | More focused on nuclear and boiler codes | | EN 970 | (Withdrawn, replaced by ISO 17637) | Historical European standard | standard, titled " Non-destructive testing of welds —