Ada banyak sekali jenis cacat yang terjadi baik pada besi cor maupun alumunium. Secara umum masing-masing dapat diklasifikasikan menjadi:An aluminium smelter contains a lot of cells (pots) during which the electrolysis normally takes put. A normal smelter is made up of between 300 to 720 pots, each of which produces about a bunch of aluminium daily