Njengoba sazi, asetshenziswa ukufakwa kwamapayipi kwensimbi kumapayipi okucindezela nasekucindezelweni komkhumbi, ukuthola izinsizakalo kumazinga okushisa alinganiselayo nawokuphakanyiswa. Izinto zokufakelwa kuleli Zinga ziqukethe insimbi ebulewe, ukuthethelelwa, imigoqo, amapuleti, imikhiqizo ye-tubular noma enomthungo enomswakama nge-filler metal ingezwe.