This code covers the arc and braze welding requirements for nonstructural sheet metal fabrications using the commonly welded metals available in sheet form up to and including 3 gauge, or 6.35 mm (0.250 inches). Applications of the code include heating, ventilating, and air conditioning systems, food processing equipment, architectural sheet metal, and other nonstructural sheet metal applications. Requirements and limitations governing procedure and performance qualification are presented, and workmanship and inspection standards are supplied. The non-mandatory annexes provide useful information on materials and processes.