He kupu ngaio motuhake ngā here kowiri tira e uru ana ki te whānuitanga o ngā hua. Ko ngā here kowiri tira e whakamahia ana hei here i ngā wāhanga mīhini utu nui ake nā te āhua, te pakari, me te ātete kaha ki te waikura.

 
Ko ngā herenga paerewa o te maitai kore waikura he tikanga kei roto i ēnei momo wāhanga e 12:
1. PūtuHe momo whakapiripiri kei roto he pane me he tīwiri (he rango me te miro o waho). Me hono ki tētahi nati, ā, ka whakamahia hei whakapiri i ngā wāhanga e rua he kōhao mā roto. Ka kiia tēnei momo hononga he hononga pūtu. Mena ka wetekina te nati mai i te pūtu, ka taea te wehe i ngā wāhanga e rua, nō reira he hononga wetewete te hononga pūtu.

2. Tāne:He momo whakapiripiri kāore he pane, ā, he miro o waho anake kei ngā pito e rua. I te wā e hono ana, me whakawiri tetahi pito ki roto i te wāhanga he kōhao miro o roto, me haere tetahi pito mā roto i te wāhanga he kōhao puta, kātahi ka whakawiri te nati, ahakoa he piri te hononga o ngā wāhanga e rua.

3. Ngā tīwiriHe momo whakapiripiri anō hoki ēnei e rua ngā wāhanga: he pane me he tīwiri. Ka taea te wehewehe kia toru ngā wāhanga e ai ki ō rātou whakamahinga: ngā tīwiri mīhini, ngā tīwiri whakatakoto me ngā tīwiri kaupapa motuhake. Ko ngā tīwiri mīhini te nuinga o te wā e whakamahia ana mō ngā wāhanga he kōhao miro whakakīkī. Kāore e hiahiatia he mahi tahi nati mō te hononga whakapiri ki tētahi wāhanga he kōhao roto (e kiia ana tēnei momo hononga he hononga tīwiri, ā, he hononga wetewete anō hoki; ka taea hoki te whakamahi me te taunga nati, e whakamahia ana mō te whakapiri i te hononga i waenga i ngā wāhanga e rua me ngā kōhao roto.) Ko ngā tīwiri whakatakoto te nuinga o te wā e whakamahia ana hei whakatika i te tūranga whanaunga i waenga i ngā wāhanga e rua. Ko ngā tīwiri kaupapa motuhake pērā i ngā tīwiri kanohi e whakamahia ana mō te hiki i ngā wāhanga.

4. Nati kowiri tira: me ngā kōhao miro o roto, ko te nuinga he āhua rite ki te rango tapaono papatahi, ki te rango tapawhā papatahi rānei, ki te rango papatahi rānei, e whakamahia ana me ngā pūtu, ngā titi, ngā tīwiri mīhini rānei hei whakau i ngā wāhanga e rua. Hangaia hei wāhanga katoa.

5. Ngā tīwiri-ā-ringaHe rite ki ngā tīwiri mīhini, engari ko ngā miro o te tīwiri he miro motuhake mō ngā tīwiri tā-ake. Ka whakamahia hei whakamau me te hono i ngā wāhanga whakarewa angiangi e rua kia kotahi ai te wāhanga. Me hanga i mua he kōhao iti ki te hanganga. Nā te mea he tino pakeke tēnei momo tīwiri, ka taea te whakauru tika ki roto i te kōhao o te wāhanga kia puta ai te wāhanga ki waenganui. Ka hangaia he miro ā-roto e arotau ana. He hononga wetewete anō hoki tēnei momo hononga.

6. Ngā tīwiri rakauHe rite anō hoki ēnei ki ngā tīwiri mīhini, engari ko ngā miro o ngā tīwiri he miro motuhake mō ngā tīwiri rakau. Ka taea te tīwiri tika ki ngā wāhanga rakau (ngā wāhanga rānei) ā, ka whakamahia hei tāpiri i tētahi mea whakarewa (kore-whakarewa rānei) me tētahi kōhao mā roto. Ka herea ngā wāhanga ki tētahi wāhanga rakau. He hononga wetewete anō hoki tēnei.
7. Mīhini HoroiHe momo whakapiripiri he rite te āhua ki te mowhiti porowhita. Kei waenganui i te mata tautoko o ngā pūtu, ngā tīwiri, ngā nati rānei me te mata o ngā wāhanga hono, ka whakanui ake i te horahanga o te mata pa o ngā wāhanga hono, ka whakaiti i te pēhanga mō ia horahanga, ka tiaki hoki i te mata o ngā wāhanga hono mai i te pakaru; tētahi atu momo horoi rapa, ka taea hoki te ārai i te wetekina o te nati.

8. Mowhiti tautoko:Ka tāutahia ki roto i te awaawa o te pou, i te awaawa poka rānei o ngā mīhini me ngā taputapu, ā, ka ārai i ngā wāhanga o te pou, o te poka rānei kia neke ki maui, ki matau hoki.

9. Ngā pine: E whakamahia ana mō te whakanoho i ngā wāhanga, ā, ko ētahi e whakamahia ana hoki mō te hono i ngā wāhanga, te whakatika i ngā wāhanga, te tuku hiko, te raka rānei i ētahi atu here.

10. Riweti:He momo hononga kei roto he pane me he kakau whao, e whakamahia ana hei whakau me te hono i ngā wāhanga e rua (ngā wāhanga rānei) ki ngā kōhao mā roto hei hanga i a rātou kia kotahi. Ka kiia tēnei momo hononga ko te hononga rivet, te whakarapopototanga rānei o te rivet. Nō roto i te hononga kore-wetewete. Nā te mea hei wehewehe i ngā wāhanga e rua e honoa ana, me whati ngā rivet o ngā wāhanga.

11. Ngā huihuinga me ngā takirua honongaKo ngā huihuinga e pā ana ki tētahi momo whakapiri e tukuna ana i roto i te huinga, pērā i te huinga o tētahi tīwiri mīhini (he pūtu rānei, he tīwiri e tukuna ana e ia anō) me tētahi horoi papatahi (he horoi puna rānei, he horoi raka): hononga Ko te takirua whakapiri e pā ana ki tētahi momo whakapiri e tukuna ana e te huinga o ngā pūtu motuhake, ngā nati me ngā horoi, pērā i te takirua o ngā pūtu pane hexagonal nui kaha-teitei mō ngā hanganga maitai.

12. Te whakarewa i ngā whaoNā te mea he rerekē ngā hononga i hangaia mai i te pūngao mārama me ngā pane whao (kāore rānei he pane whao), ka whakapūmauhia, ka honoa ki tētahi wāhanga (wāhanga rānei) mā te tikanga whakarewa kia taea ai te hono atu ki ētahi atu wāhanga paerewa kowiri tira.

Rauemi
He whakaritenga anō ā ngā wāhanga paerewa o te kowiri tira mō ngā rauemi mata hanga. Ko te nuinga o ngā rauemi kowiri tira ka taea te hanga hei waea rino, hei tokotoko rānei mō te hanga whakapiri, tae atu ki te kowiri tira austenitic, te kowiri tira ferritic, te kowiri tira martensitic, me te kowiri tira whakapakeketanga. Nā, he aha ngā mātāpono ina whiriwhiria ngā rauemi?

Ko te whiriwhiri i ngā rauemi kowiri tira ka whai whakaaro nui ki ngā āhuatanga e whai ake nei:
1. Ngā whakaritenga mō ngā rauemi whakapiri e pā ana ki ngā āhuatanga ā-pūkaha, inā koa te kaha;
2. Ngā whakaritenga mō te ātete waikura o ngā rauemi i raro i ngā tikanga mahi
3. Ngā whakaritenga o te pāmahana mahi mō te ātete wera o te rauemi (te kaha o te pāmahana teitei, te ātete hāora me ētahi atu āhuatanga):
Ngā whakaritenga tukanga whakaputa mō te mahi tukatuka rauemi
5. Me whai whakaaro ki ētahi atu āhuatanga, pēnei i te taumaha, te utu, te hoko me ētahi atu āhuatanga.
Whai muri i te whakaaroaro whānui me te whānui ki ēnei āhuatanga e rima, ka whiriwhiria te rauemi maitai kore waikura e tika ana kia rite ki ngā paerewa ā-motu e tika ana. Me tutuki hoki i ngā wāhanga paerewa me ngā here e hangaia ana ngā whakaritenga hangarau: ngā pūtu, ngā tīwiri me ngā pou (3098.3-2000), ngā nati (3098.15-200) me ngā tīwiri huinga (3098.16-2000).