The angle of the eye relative to the surface should not be less than 30° .
The standard applies to the visual inspection of welds the welding process: iso 17637 pdf
For direct inspection, the eye should be within 600 mm of the surface. The angle of the eye relative to the
Checking joint preparation, cleanliness, and assembly. iso 17637 pdf
Assessing the finished weld's profile, dimensions, and surface integrity. 2. Key Technical Requirements
The surface must have a minimum white light intensity of 350 lx , though 500 lx is recommended for better visibility.