Building up Welding Blade is especially designed for heavy duty cutting machines used in recycling plants for the shredding of the waste and damaged products to reduce their sizes. It is manufactured by welding together heavy blades which make it capable to reduce the size of the products such as basins, metal sheets, rubber tyres and many other objects. Building up Welding Blade is provided with a series of slots at the internal sides of the hollow circular section at the centre. The slots engraved allows to provide a rigid and firm contact in between the rotating shaft and the blades.