For AWS D1.1 applications try Section 6, paragraph 6.9 for visual inspection frequency of inspection; paragraph 6.1.1 for NDT stipulations.
AWS D1.3 does not specify 100% inspection however; paragraph 6.1.1.5 requires weld length, size and location to be per the contract documents. I interpret this as all the welds unless a frequency is specified by the engineer of record.
Best regards,
Vonash