Hot-Dip Galvanizing and Diaphragm Open Area Ratio -- HOT-DIP-GAL
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If the immersion speed into the plating bath does not maintain 4 m/s at the time of immersion, cracks caused by brittle fracture will remain in the bath near the drain holes in the beams and columns; these will be discovered after the workpiece is removed from the bath. If the cracks are large, they will be difficult to repair.
The default values, for a column size of D = 450 mm, are: central hole A = 150 mm and corner notch B = 130 mm.
The default values, for a column size of D = 450 mm, are: central hole A = 150 mm and corner notch B = 130 mm.
| Da = (H + W) / 2 | mm |
The open area ratio is calculated by summing the central hole and the notches at the four corners.
The relationship between column size D and open area ratio K is as follows: D ≥ 305 → K ≥ 25%, D = 200–305 → K ≥ 30%.
The relationship between column size D and open area ratio K is as follows: D ≥ 305 → K ≥ 25%, D = 200–305 → K ≥ 30%.
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[110,325] HOT-DIP-GALVANIZING-HOLE=RATIO
Da=2.7×A+1.9×B-202 --------JISH9124 (Hot-Dip Galvanizing Work Guidelines and Explanatory Notes) A:B=1:1