1704.26 Aluminum construction. The special inspections for structural aluminum elements of buildings and structures shall be as required by Section 1704.26.1‡.
1704.26.1 Welding operations. All welding operations of aluminum elements shall be subject to special inspection for compliance with this code, AA ASM-35, Parts 1A and 1B of the Aluminum Design Manual, and AWS D1.2.
Exception: Welding operations in connections where the calculated stresses in the welds are less than 50 percent of the basic allowable values.