Ububanzi obuncane, obusuka ku-75mm ukuya ku-225mm, i-electrode yethu yegraphite iklanyelwe ngokukhethekile ukuhlangabezana nezidingo zezimboni ezifana nokuncibilikisa i-calcium carbide, ukukhiqizwa kwe-carborundum, ukucwengwa kwe-corundum emhlophe, ukuncibilikisa izinsimbi ezingavamile, kanye nezidingo zokuphikisa isitshalo se-Ferrosilicon.