When welding the top plate and the flange angle steel of large vertical storage tanks, the weld seams should be symmetrically and evenly distributed, and分段退焊 along the same direction, first welding the inner seam and then the outer seam. Longitudinal welds should adopt the gap-symmetric welding method and be segmented from the center outward. Before welding, inspect the assembly quality and remove rust, moisture, and dirt from the bevel surfaces and within 20mm on both sides of the bevels, ensuring complete drying. When the flaw depth or grinding depth exceeds 1mm, perform additional welding and grind smooth. For harmful defects such as scratches deeper than 0.5mm, arc擦伤, or weld spatter, grind smooth. The thickness of the steel plate after grinding should not be less than the actual steel plate thickness minus the negative deviation value. For the welding of the tank wall, first weld the vertical seams, then the circumferential seams. After completing the longitudinal seams of adjacent two circles of tank panels, weld the circumferential seams between them, ensuring even distribution of the welds and welding along the same direction. Welding of locating welds and tooling should be done by qualified welders, with the arc not initiated on the base material or completed welds.
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