Umphumo wokukhetha kunye nokugqithisa ngexesha lokucwangciswa kwangaphambili, ukuwelda, ukuvavanywa, kunye nokunyangwa kobushushu kuya kubangela ukuba i-iron oxide, i-welding slag, igrisi, kunye nolunye ukungcola luqokelele phezu kombhobho (umbhobho we-carbon steel, umbhobho we-carbon copper, umbhobho wensimbi engenasici) , eya kunciphisa umhlwa kwakhona...
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