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6.4 Prefabrication of Roof Plates
6.4.1 All roof plates shall be planned as shown on the cutting plan in the design drawing.
6.4.2 The distance between any adjoining welds of roof plates shall not be less than 200mm.
6.4.3 The distance between the fillet weld connecting stiffeners to roof plates and the butt weld of roof plates shall be not less than 200mm.
6.4.4 All roof plates shall be inspected using an arc sample plate or a linear sample plate，with a gap no greater than 3mm.