The welding of curtain wall connectors must meet the specifications in three aspects: materials, process, and quality, as follows:
Material Requirements
Connector Thickness: The thickness of steel plates/profiles for steel connectors should not be less than 5mm, and the thickness of aluminum profiles should not be less than 6mm.
Electrode Matching: The welding electrode must match the strength of the steel. E43 type welding electrodes are commonly used to ensure a strong weld.
Process Requirements
Weld Leg Size: Must comply with the requirements of the "Code for Design of Steel Structures": Minimum weld leg size ≥ 1.5√t (t is the thickness of the thicker weldment); Maximum weld leg size ≤ 1.2 times the thickness of the thinner weldment; The weld between the connector and the embedded plate can be controlled within 7-8mm. Welding between steel parts <6mm thick uses full welding with the same height as the smaller wall thickness.
Welding Method: L-shaped brackets and embedded plates commonly use three-sided welding. The calculated weld length must be reduced according to the specifications. Straight anchor bars and anchor plates should be T-welded; for diameters > 20mm, through-hole plug welding is recommended.
Quality and Acceptance Requirements: Fillet welds are classified as Class III welds, and their appearance must meet Class II weld inspection requirements.
Welded connections must comply with design requirements and current welding specifications. Hidden works acceptance records and construction records must be checked.
Damaged areas after welding must be recoated with anti-corrosion coating. Embedded parts must undergo hot-dip galvanizing treatment with a zinc coating thickness > 45 micrometers.