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Pressure-welded gratings
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PcP grating before pressure welding. Type B upside down.
Pressure welding
 PcP grating after pressure welding- Type B upside down. |
Manufacturing
Pressure welded grating consists of a combination of bearing bars that give the grating its strength, and filler/control bars. The bars are pressed and welded together in one process in the pressure welder. The actual pressure welding involves electrical heating of the bar material and the subsequent joining of the bars under great pressure at a temperature of approx. 1500ºC, thus ensuring fusion - in other words a spot weld. This process binds the bars together in a grid. Because all intersections are welded, there is practically no risk that the bars work loose when cutting to size or when using the grating without edge bar. In order to finish the gratings and to protect against sharp edges, edge bar is normally welded on the sides. The edge bar is usually 3 mm thick plate, although thicker plates can be fitted if requested.
Material
The gratings may be pressure-welded in steel S235JRG2 (steel 37-2), Stainless EN 1.4301 or 1.4404 and pressure-locked in aluminium.
Surface treatment
The gratings are primarily hot-dip galvanised according to BS EN ISO 1461 1999, but are also available in other finishes, depending on the material of the grating, such as:
The surface of the gratings may also be treated further by brushing the surface or shot-blasting the gratings. |
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