Ngemuva kokugoba kwe-U (ukwakheka okubandayo), ukwelashwa ngokushisa kwengxenye yokugoba kungase kudingeke.umshini okhiqiza i-nitrogen (ukuvikela indawo yeshubhu yensimbi engagqwali ngesikhathi sokudonsa).Izinga lokushisa lilawulwa kuyo yonke indawo ephethwe ukushisa ngama-pyrometers angaguquki naphathekayo e-infrared.