Ko ngā rivet o mua he titi iti i hangaia ki te rakau, ki te wheua rānei. Ko te tinana whakarewa o mua pea te tūpuna o ngā rivet e mōhiotia ana e tātou. Kāore e kore koinei ngā tikanga tawhito mō te hononga whakarewa e mōhiotia ana e te tangata, e taea ana te whai i ngā tikanga tawhito ki te whakamahinga o te konganuku ngāwari. Hei tauira, i te Wā Parahi, i rivetia e ngā Ihipiana ngā tinana pā rakau e ono o te rārangi o waho o te wira kōhao me ngā rivet. Whai muri i te angitu o te hanga a ngā Kariki i ngā whakapakoko nunui me te parahi, ka rivetia e rātou ngā wāhanga me ngā rivet. I tēnei wā, he maha ake ngā momo whanaketanga rivet, ko te nuinga mō te whakawhanaketanga o ngā umanga rerekē.
Ko te kupu "ngā wāhanga paerewa kowiri tira" he kupu motuhake e kapi ana i te whānuitanga o ngā hua. Ko ngā wāhanga paerewa kowiri tira e whakamahia ana mō te whakamau i ngā wāhanga mīhini utu nui ake nā te mea he ataahua, he pakari, he ātete kaha ki te waikura me ētahi atu āhuatanga. I te whanaketanga o te hapori, kua whakaritea hoki ngā whakaritenga teitei mō ngā wāhanga paerewa kowiri tira. Ko ngā wāhanga paerewa kowiri tira e pā ana ki ngā tīwiri kowiri tira, arā, he tīwiri paerewa. Ko ngā whakatakotoranga, ngā ine me te whānuitanga o te manawanui he paerewa ā-motu katoa.
He whakaritenga anō ā ngā wāhanga paerewa o te kowiri tira mō ngā rauemi hanga. Ko te nuinga o ngā rauemi kowiri tira ka taea te hanga hei waea rino, hei pae 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 i te wā e whiriwhiri ana i ngā rauemi? Ko te whiriwhiri i ngā rauemi kowiri tira ka whakaarohia i ngā āhuatanga e whai ake nei:
1. Ngā whakaritenga mō ngā āhuatanga miihini, inā koate kaha o ngā rauemi whakapiri;
2. Ngā whakaritenga mō ngā tikanga mahi i runga ite ātete ki te waikura o ngā rauemi;
3. Ngā whakaritenga o te pāmahana mahi mō te ātete wera (te kaha o te pāmahana teitei, te ātete waikura) o ngā rauemi;
4. Ngā whakaritenga mō te mahi tukatuka rauemi e pā ana ki te hangarau whakaputa;
5. Me whai whakaaro ki ētahi atu āhuatanga, pērā i te taumaha, te utu me te hoko.
Wā tuku: Maehe-16-2023