Mō te hononga parahi, ehara te tika i te mea he mea pai noa iho—engari he mea pai, he mea whakararu rānei mō te roa o te hua, te mahi, me te ataahua. Ahakoa kei te hanga koe i ngā wāhanga HVAC, i ngā hononga hiko, i ngā taputapu parahi whakapaipai rānei, mā te tikanga whakarewa hē ka arahi pea ki ngā hononga porous, te ngaronga o te konutea, ngā whakaotinga kino rānei ka whakararu i ō kaupapa. Mena kua raru koe ki ngā hua koretake mai i ngā tikanga whakarewa parahi tuku iho, kua tae ki te wā ki te titiro ki tua atu i ngā kaupapa taketake: ko te whakarewa TIG pea te otinga e rapuhia ana e koe.
Tuatahi, me wehewehe tātou i ngā kaupapa matua o te Whakarewa Parahi hei whakatakoto i te kaupapa. Ko te parahi, he koranu parahi me te konutea, he mea rongonui puta noa i ngā ahumahi mō tōna kawe wera pai, tōna ātete ki te waikura, me tōna ngāwari ki te whakangawari—engari ko ēnei āhuatanga anō ka uaua te whakarewa. Kāore i rite ki te maitai, he iti te pāmahana kohua konutea o te parahi (907°C) he iti iho i te pāmahana rewa o te parahi (1083°C), ko te tikanga ka wera rawa i te wā whakarewa ka mimiti te konutea. Ehara i te mea ka ngoikore noa iho ngā whakarewa engari ka puta hoki ngā paowa paitini, ka tāpiri atu ki ngā mōrearea haumaru ki te tukanga. Hei tāpiri, ko te kawe wera teitei o te parahi te tikanga ka tere te memeha o te wera, ka uaua ki te pupuri i te puna whakarewa pumau me ngā tikanga kāore i te tino tika.
Tewhakarewa parahiE hiahia ana te umanga ki ngā otinga e whakataurite ana i te whai huatanga me te kounga, inā koa i ngā rāngai pēnei i te motuka, te rererangi, me te putorino, me tutuki ngā paerewa haumaru me te mahi tino pakari i ngā wāhanga. Mō te whakaputanga nui, ko te ōritetanga te mea nui—ko ngā rerekētanga o te kaha, te āhua rānei o te whakarewanga i ia puranga ka arahi ki te mahi anō utu nui, ki te whakahoki mai rānei i ngā hua. Mō ngā mahi ritenga, whakapaipai rānei, ko te whakaotinga ataahua te mea nui; ka taea e te whakarewanga paru te whakakino i te ataahua tirohanga o ngā taputapu parahi, ngā taonga puoro, ngā taipitopito hoahoa rānei. Mā ēnei hiahia o te umanga ka whakamārama he aha te nuinga o ngā tohunga e tahuri ana ki te whakarewa TIG mō te hononga parahi tino tika.
Nā, he aha te take i tino pai ai te whakarewa TIG (e mōhiotia ana ko te Whakarewa Āwhata Tungsten Hau, GTAW) mō te whakarewa parahi? Me tīmata tātou me tōna tino tika. Ka whakamahia e TIG he hiko tungsten kore-pau me te pēne waewae mō te whakahaere amperage, e āhei ai ngā kaiwhakarewa ki te whakatikatika i te whakaurunga wera me te tino tika. He mea nui tēnei taumata whakahaere mō te parahi: ka ārai i te wera nui, ka whakaiti i te mimiti o te konutea, ā, ka whakaiti i te tūponotanga o te porosity—he hapa noa i roto i ētahi atu tikanga whakarewa pēnei i te whakarewa MIG, te whakarewa hau rānei. Mō ngā pepa parahi angiangi, ngā ngongo iti rānei (he mea noa i roto i ngā tono hiko me te HVAC), ka ārai hoki te kaha whakaurunga wera iti o TIG i te piko, ka tiakina te āhua taketake me te pono o te rauemi.
Ko tētahi atu painga nui o te whakarewa TIG mō te hononga parahi ko tōna āhua ma, kāore he para. Kāore i rite ki te whakarewa rakau, kāore e hiahiatia he rere mō te TIG, ā, kāore e hiahiatia he horoinga i muri i te whakarewa hei tango i ngā toenga para—he penapena wā nui tēnei mō ngā awheawhe pukumahi. Ko te hau tiaki kore mahi (ko te nuinga he argon, he ranunga argon-helium rānei) e whakamahia ana i roto i te whakarewa TIG ka tiaki hoki i te puna whakarewa mai i te poke o te hau, ka ārai i te waikura me te whakarite kia maeneene, kia ōrite te hononga e kaha ana, e ātaahua ana hoki ki te titiro. He huringa nui tēnei mō ngā mahi parahi whakapaipai, ngā wāhanga rānei e kore e taea te tautohetohe mō te ātete ki te waikura, pērā i ngā wāhanga moana, ngā wāhanga paipa rānei.
Ko te haumaru tētahi atu wāhanga e tino kitea ana e TIG mō te whakarewa parahi. Ahakoa he mōrearea te pānga o te paowa konutea ki ngā tikanga whakarewa parahi katoa, ka whakaitihia e te whakahaere wera tika a TIG te nui o te mimiti konutea ki te whakataurite ki ngā tikanga wera nui pēnei i te whakarewa oxyacetylene. Ina honoa ki te hauhautanga tika me ngā taputapu tiaki whaiaro (PPE), ka hangaia e TIG he taiao mahi haumaru ake—he kaupapa matua mā ngā pakihi e hiahia ana ki te whai i ngā ture OSHA me te HSE. Hei tāpiri, kāore te whakarewa TIG e puta he mura, he tauhiuhi rānei, ka whakaitihia ngā mōrearea ahi i roto i ngā awheawhe me ngā rauemi mura.
He mea tika kia mōhiotia ehara te whakarewa TIG i te otinga kotahi-rahi mō te katoa, engari nā tōna maha o ngā mahi ka taea te urutau ki te nuinga o ngā hiahia hononga parahi tino tika. Ka mahi tahi me ngā koranu parahi iti-konutea (alpha) me te konutea-nui-konutea (alpha-beta), ā, ka taea te whakahaere i ngā matotoru mai i ngā ine angiangi (i raro i te 1.5mm) tae atu ki te 9mm me ngā rauemi whakakī tika. Mō ngā parahi nui-konutea, mā te whakamahi i te tokotoko whakakī kore-konutea me te hau tiaki whai-hīria ka whakaitihia te whakaputanga o te paoa me te porosity, ka whakarite kia kaha, kia pono hoki ngā whakarewa.
Mō ngā kaihoko me ngā kaihanga e arotake ana i ngā kōwhiringa Whakarewa Parahi, ko te whakatau ka whakawhirinaki ki ō kaupapa matua. Mena he tere te hiahia ki a koe i runga ake i ngā mea katoa, he pai pea te whakarewa MIG mō ngā wāhanga parahi matotoru. Engari ki te kore e taea te whiriwhiri i te tika, te ōritetanga, me te kounga—ina koa mō ngā tono nui, ataahua rānei—ko te whakarewa TIG te kōwhiringa mārama. Ka aro atu ki ngā wero ahurei o te parahi hei rauemi, ka tutuki i ngā paerewa pakari o ngā ahumahi matua, ā, ka puta he hua e whakaiti ana i te mahi anō me te whakapai ake i te uara o te hua whakamutunga.
I te ao o te hononga parahi tino tika, ko te tapahi i ngā kokonga me ngā tikanga whakarewa taketake ka arahi pea ki ngā raruraru ā muri ake nei. Ehara i te mea he pikinga noa iho te whakarewa TIG i ngā tikanga tuku iho—he haumitanga ki te kounga e whai hua ana i roto i te mahi pai ake, ngā mahi haumaru ake, me ngā kiritaki harikoa. Ahakoa he kaihanga mohio koe, he tīmata noa rānei ki te mahi me te parahi, ko te huri ki te TIG pea te rerekētanga i waenga i ngā hua pai me ngā hua pai.
Wā tuku: Hanuere-07-2026