To qualify as a Certified Welding Inspector, you must pass a vision test and have a combination of qualifying education and work experience, with supporting documentation:

MINIMUM EDUCATION MINIMUM WORK EXPERIENCE
Bachelor or higher degree in welding engineering or welding technology - (4) years maximum substitution Minimum of (1) years welding based work experience
Associate or higher degree in welding or non-welding related engineering technology, engineering, or a physical science - (3) years maximum substitution Minimum of (2) years welding based work experience
Engineering/Technical courses that can be applied to Bachelor or higher degree in Welding - (2) years maximum substitution Minimum of (3) years welding based work experience
Trade/Vocational courses - (1) year maximum substitution for successfully completed courses Minimum of (4) years welding based work experience
High school diploma or approved high school equivalency diploma Minimum of (5) years welding based work experience
8th grade level of schooling Minimum of (9) years welding based work experience
Less than 8th grade Minimum of (12) years welding based work experience