2025-07-01    88

(I) General Provisions

• Ultrasonic testing (or other non-destructive testing) of welds for carbon structural steel shall be performed after the weld has cooled to the ambient temperature.

• Ultrasonic testing (or other non-destructive testing) of welds for low-alloy structural steel shall be performed at least 24 hours after welding completion.

(II) Welding of Steel Components

1. Critical Control Items
(1) Welding Material Compatibility: The matching of welding materials (welding rods, wires, fluxes, electroslag welding consumable nozzles, etc.) with the base metal shall comply with the design requirements and the provisions of the current industry standard *JGJ 81-2002 Technical Specification for Welding of Steel Structures of Buildings*.
Storage & Handling: Welding rods, fluxes, flux-cored wires, consumable nozzles, etc., shall be baked and stored according to their product specifications and welding procedure documents prior to use.
(2) Welder Qualification: Welders must pass the qualification examination and obtain a valid certificate. Certified welders shall only perform welding within the scope of their qualified items and approval range. Full inspection shall be performed to verify the validity, scope of approval, and qualification certificates of all welders.

2. General Items

• Weld Appearance: The visual appearance of welds shall meet the following requirements:

• The weld profile shall be uniform with good formation.

• The transition between weld passes, and between weld passes and the base metal, shall be relatively smooth.

• Slag and spatter shall be substantially removed.