Ngwa nke akụrụngwa na -emenyụ ọkụ ugboro ugboro

N’ihi na workpieces doro alternating ibu dị ka torsion na-ehulata, elu oyi akwa chọrọ idi elu nchegbu ma ọ bụ eyi iguzogide karịa isi, na elu nke workpiece kwesịrị ike. Ọ dabara maka ígwè nwere carbon ọdịnaya nke We = 0.40-0.50%.