Mgbe U gbadaa (oyi na-akpụ), enwere ike ịchọ ọgwụgwọ okpomọkụ nke akụkụ na-ehulata.igwe na-emepụta nitrogen (iji chebe elu igwe anaghị agba nchara n'oge annealing).A na-achịkwa okpomọkụ site na mpaghara dum a na-agwọ okpomọkụ site na pyrometer infrared edoziri na obere ibu.