Steel grating, also known as grating plate, is mainly made by placing flat steel at a certain distance and crossing it with horizontal bars, welding them into steel products with square grids in the middle. It is often used as a drainage ditch cover plate, steel structure access plate, steel ladder step plate, etc. The horizontal bars are generally made of twisted square steel. Steel grilles are commonly made of carbon steel, with a surface treated with hot-dip galvanizing to prevent oxidation. Stainless steel materials can also be used, and they have multiple functions such as ventilation, lighting, heat dissipation, anti slip, and explosion prevention.
There are various processing techniques for steel grating, among which machine pressure welding is the use of high-voltage resistance welding machines. The mechanical arm automatically places the horizontal bars horizontally on evenly arranged flat steel, and uses strong welding power and hydraulic pressure to press weld the horizontal bars into the flat steel. This can result in high-quality steel grating with firm, stable, and highly strong welding points. However, this welding process is affected by equipment and current voltage matching. Generally, the strength of double bar welding is higher than that of single bar welding, and it is also related to the unevenness of the raw material flat steel. The width error of the flat steel may affect the welding strength, resulting in inconsistent strength. Moreover, this process has the disadvantages of false welding and virtual welding, which can easily cause the horizontal bar to peel off.
Handmade welding processing involves first punching or slotting holes on the flat steel, and then spot welding the crossbar into the holes. There will be gaps between the crossbar and the flat steel, and each contact point between the crossbar and the flat steel needs to be welded. When the crossbar is dense, spot welding can also be performed at intervals. This production process is relatively flexible and diversified, and can basically produce a full range of steel grating. It has advantages in heavy-duty products, but due to the reliance on manual welding, it is easy to have weak welding, missed welding, and false welding, which can lead to a decrease in strength.
Locking processing involves punching or slotting holes on flat steel, then placing horizontal bars horizontally on evenly arranged flat steel and pressing them into pre made slots. This product has a beautiful appearance, but its strength is not high.
In the interlocking welding free processing, both directions of the horizontal bar are flat steel. First, punch holes or slots on the flat steel, then thread the flat steel into the prefabricated slots and lock it. This product is also aesthetically pleasing, but its strength is not high.