Ma hope o ka hoʻopio ʻana a me ka hoʻomāʻū ʻana, hana ka pine i ka hoʻopaʻakikī induction mid-frequency e hōʻoia i ka ikaika o ke kumu a me ke kūpaʻa o ka ʻili o waho.
Ma hope o ka carburisation, hana ʻia ka pine bush i ka hoʻopaʻakikī ʻana o ka induction mid-frequency i loko a me waho e hōʻoia i ka paʻakikī o ke kumu a me ke kūpaʻa o ka ʻaʻahu ʻana o nā ʻili o loko a me waho.
