T/GMES 034-2025 Grid equipment welding quality inspection and acceptance specifications

Scope

5 Welding Quality Inspection 5.1 Steel Structure Welds This section applies to the welding quality inspection of power grid equipment components such as angle steel towers, steel pipe towers (poles), substation frames, equipment supports, and lightning rods. The welds of other non-pressure-bearing equipment components can be inspected according to this standard. 5.1.1 Welding Classification Welds should be classified based on the load nature of the structure, welding form, working environment, stress state, and importance. If specified in design technical documents or product standards, the requirements of these documents should be followed. The classification principles of welding categories are as follows: a) Welds subject to tensile or shear forces under dynamic or static loads, and butt welds and combination butt-fillet welds designed for equal strength are classified as Class I welds. b) Welds subject to compressive forces under dynamic or static loads, and combination butt-fillet welds designed for equal strength are classified as Class II welds. c) All other welds are classified as Class III welds. 5.1.2 Visual Inspection (1) Technical Requirements for Visual Inspection a) All welds should first pass a visual inspection before undergoing non-destructive testing. b) The visual inspection of welding joints should be conducted after the welds have cooled naturally to ambient temperature (20±3°C). c) Visual inspection should generally be performed by naked eye. When directly inspecting by visual observation, the observer's distance to the surface of the inspected item and the angle between the observer's eyes and the surface of the inspected item should meet the following requirements: - The distance between the observer's eyes and the surface of the inspected item should not exceed 600mm. - The angle between the observer's eyes and the surface of the inspected item should not be less than 30°. - The area inspected by di

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