ISO 17637:2016 standard provides the official framework for the non-destructive visual testing
Even thin-gauge TIG welds are inspected visually. Porosity less than 5% of the weld length is often accepted, but the inspector needs the precise table from the standard. iso 17637 pdf
The standard outlines specific technical requirements to ensure that visual inspections are reliable and standardized across the industry. Testing Conditions & Environment Illuminance : A minimum surface light level of is required, though is strongly recommended for better visibility. : The inspector's eye should ideally be within of the surface, with a viewing angle not less than 30 raised to the composed with power Personnel Qualifications ISO 17637:2016 standard provides the official framework for
She pulled out her illuminated magnifier (7×, as ISO 17637 required for fine surface evaluation) and started at the 12 o’clock position. For two hours, she moved clockwise, millimeter by millimeter. For two hours, she moved clockwise, millimeter by millimeter