What are the acceptance criteria for welded balls in Steel Structure Engineering?

1.Welded balls and the raw materials used in the manufacture of welded balls, their varieties, specifications, performance, and so on should be in line with the current national product standards and design requirements.

Inspection number: full inspection.
Inspection method: Check the quality of the product certification documents, Chinese signs, and inspection reports.

2. Welded ball welds shall be subjected to nondestructive testing, and their quality shall conform to the design requirements, when the design does not require it, it shall conform to the secondary quality standards outlined in this specification.

Inspection Quantity:5% of each specification according to the number of samples, and should not be less than 3.
Inspection method: ultrasonic flaw detection or inspection report.

3. Welding ball diameter, roundness, wall thickness reduction and other dimensions and allowable deviations should be consistent with the provisions of this specification.
Inspection number % of each specification according to the number of samples, and should not be less than 3.
Inspection method: calipers and thickness gauge inspection.

4. The surface of the welded ball should be free of obvious ripples and local unevenness not more than 1.5mm.
Inspection Quantity % of each specification according to the number of samples, and should not be less than 3.
Inspection method: Use arc set mold, caliper, and observation check.

This specification belongs to the GB standard, which applies to the acceptance of construction quality of single-story, multi-story, high-level, and steel structure projects such as net frames and pressurized metal plates of building projects.