Ko te whakarewa i ngā ngongo me ngā paipa kowiri tira he mea hiahia kia whakamuri ki te argon ina whakamahia ngā tukanga tuku iho pēnei i te whakarewa pewa hau tungsten (GTAW) me te whakarewa pewa whakarewa ārai (SMAW). Engari he mea nui te utu o te hau me te wā whakarite o te tukanga horoi, inā koa ka piki haere te whānui me te roa o ngā paipa.
I te wā e whakarewahia ana te maitai kore waikura raupapa 300, ka taea e ngā kaimahi kirimana te whakakore i te pupuhi i roto i ngā whakarewa pakiaka tuwhera mā te huri mai i te GTAW tuku iho, SMAW rānei ki tētahi tukanga whakarewa kua whakapaitia, me te whakatutuki tonu i te kounga whakarewa teitei, te pupuri i te ātete waikura o te rauemi, me te whakatutuki i te Whakatakotoranga Tukanga Whakarewa (WPS) e hiahia ana ki tētahi tukanga whakarewa pewa hau porowhita-poto (GMAW). Ka kawea mai hoki e te tukanga GMAW porowhita-poto kua whakapaitia he painga anō mō ​​te hua, te whai huatanga me te ngāwari o te whakamahi, e āwhina ana ki te whakapai ake i ngā hua.
He mea pai te whakamahi i ngā koranu kowiri tira mō te ātete ki te waikura me te kaha, ā, e whakamahia ana i roto i ngā mahi paipa me ngā ngongo maha, tae atu ki te hinu me te hau, te matū hinu, me ngā wahie koiora. Ahakoa kua whakamahia te GTAW i roto i ngā mahi kowiri tira maha, he ngoikoretanga anō ōna ka taea te whakatika mā te whakapai ake i te GMAW porowhita-poto.
Tuatahi, i te mea kei te haere tonu te korenga o ngā kaiwhakarewa mohio, he wero tonu te kimi i ngā kaimahi e mōhio ana ki te GTAW. Tuarua, ehara te GTAW i te tukanga whakarewa tere rawa, e aukati ana i ngā kamupene e hiahia ana ki te whakapiki i te hua hei whakatutuki i ngā hiahia o ngā kiritaki. Tuatoru, me horoi anō ngā ngongo maitai kore waikura ki te wai, he nui te utu, he nui hoki te wā.
He aha te blowback? Ko te purge te whakaurunga o te hau i te wā o te tukanga whakarewa hei tango i ngā poke me te tautoko. Ka tiakina e te purge o muri o te whakarewa mai i te hanga waikura taumaha i te aroaro o te hāora.
Ki te kore te taha o muri e tiakina i te wā e whakarewahia ana te awa pakiaka tuwhera, ka pāngia pea te papa. Ka kiia tēnei pakaru ko te saccharification, i tapaina pērā nā te mea ka puta he mata e rite ana ki te huka i roto i te whakarewa. Hei ārai i te kuru, ka whakauruhia e te kai whakarewa he ngongo hau ki tetahi pito o te paipa, ka purua te pito o te paipa ki te ārai horoi. I hangaia hoki e rātou he pūhau i tetahi pito o te paipa. I te nuinga o te wā ka whakatakotoria e rātou he rīpene huri noa i te whakatuwheratanga o te hononga. I muri i te horoinga o te paipa, ka tihorea e rātou tetahi wāhanga o te rīpene huri noa i te hononga, ā, ka tīmata te whakarewa, me te mahi anō i te tukanga tango me te whakarewa kia oti ra ano te pūtake pakiaka.
Whakakorehia te pupuhi whakamuri. Ka nui te wā me te moni e pau ana i ngā whakamuri, ā, i ētahi wā ka tāpirihia he mano tāra ki te kaupapa. Nā te whakawhiti ki tētahi tukanga GMAW poto-arai kua pai ake kua taea e te kamupene te whakaoti i ngā whakawhiti pakiaka me te kore e hoki whakamuri i roto i te maha o ngā tono maitai kore waikura. He pai rawa ngā tono whakarewa mō ngā maitai kore waikura raupapa 300 mō tēnei, ko ngā tono whakarewa mō ngā maitai kore waikura takirua teitei-parakore e hiahia ana ki te GTAW mō te whakawhiti pakiaka.
Mā te pupuri i te iti o te wera e uru mai ana ka āwhina i te pupuri i te ātete ki te waikura o te mea mahi. Ko te whakaiti i te maha o ngā whitinga whakarewa tētahi huarahi hei whakaiti i te wera e uru mai ana. Ko ngā tukanga GMAW poto-arai kua whakapaitia, pērā i te Regulated Metal Deposition (RMD®), ka whakamahi i te whakawhiti whakarewa kua tino whakahaerehia hei whakarato i te whakatakotoranga pata ōrite. Mā tēnei ka māmā ake te whakahaere a te kai whakarewa i te puna whakarewa, ka whakahaere i te wera e uru mai ana me te tere whakarewa. Mā te iti o te wera e uru mai ana ka taea e te puna whakarewa te tio tere ake.
Mā te whakawhiti whakarewa whakahaeretia me te tere o te tio o te puna whakarewa, ka iti ake te pōrearea o te puna whakarewa, ā, ka noho te hau tiaki i te pū GMAW kia kaua e whakakorikoria. Mā tēnei ka taea e te hau tiaki te haere mā roto i te pakiaka tuwhera, ka nekehia te āhuarangi, ā, ka ārai i te saccharification, te waikura rānei i te tuara o te whakarewa. He poto noa te wā e pau ana ki tēnei kapi hau nā te mea he tere rawa te tio o ngā puna wai.
Kua whakaatuhia e ngā whakamātautau kua tutuki i te tukanga GMAW ara-poto kua whakarerekētia ngā paerewa kounga whakarewa, me te pupuri tonu i te ātete ki te waikura o te maitai kore waikura pērā i te wā i whakarewaina ai te pūtake pakiaka ki te GTAW.
Me whakamana anō e te kamupene tana WPS mēnā ka huri te tukanga whakarewa, engari ka nui te wā e hoki mai ai, ā, ka penapena moni anō hoki mā te hanga me te whakatika i ngā mahi hou.
Mā te whakarewatanga o te awa pakiaka tuwhera mā te whakamahi i tētahi tukanga GMAW poto-ara kua whakapaitia, ka tukuna atu he painga anō mō ​​te hua, te whai huatanga me te whakangungu kaiwhakarewa. Kei roto i ēnei:
Ka whakakore i te pūmanawa o ngā awa wera nā te mea ka taea te whakatakoto i te konganuku hei whakanui i te matotoru o te awa pakiaka.
He tino pai te manawanui ki te kore e tika te tūnga i waenga i ngā wāhanga paipa. Nā te maeneene o te whakawhiti whakarewa, ka taea e te tukanga te whakakī i ngā āputa tae atu ki te 3⁄16 inihi.
Ahakoa te toronga o te hiko, he rite tonu te roa o te pewa, ā, he mea tēnei hei utu mō ngā kaiwhakahaere e uaua ana ki te pupuri i te toronga ōrite. Mā te puna whakarewa ngāwari ake te whakahaere me te whakawhiti whakarewa ōrite ka taea te whakaiti i te wā whakangungu mō ngā kaiwhakarewa hou.
Whakaitihia te wā kore mahi mō ngā whakawhiti tukanga. Ka taea te whakamahi i te waea me te hau tiaki kotahi mō ngā hongere pakiaka, whakakī me te taupoki. Ka taea te whakamahi i tētahi tukanga GMAW pāorooro mēnā kua whakakīia, kua taupokina hoki ngā hongere ki te 80% o te hau tiaki argon.
Mō ngā mahi e hiahia ana ki te whakakore i te whakamuri i roto i ngā tono maitai kore waikura, he mea nui kia whai i ngā tohutohu matua e rima mō te angitu i te wā e huri ana ki tētahi tukanga GMAW ara-poto kua whakarerekētia.
Horoia te roto, te waho hoki o ngā paipa hei tango i ngā poke. Whakamahia he paraihe waea i hangaia mō te maitai kore waikura hei horoi i te tuara o te hononga kia 1 inihi te iti rawa mai i te taha.
Whakamahia he konganuku whakakī kowiri tira he nui te ihirangi silicon, pērā i te 316LSi, te 308LSi rānei. Ka āwhina te ihirangi silicon teitei i te mākū o te puna whakarewa, ā, ka mahi hei tango i te waikura.
Mō te mahi pai rawa atu, whakamahia he ranunga hau ārai i hangaia mō te tukanga, pērā i te 90% heriuma, te 7.5% ākona, me te 2.5% hauhā. Ko tētahi atu kōwhiringa ko te 98% ākona me te 2% hauhā. Tērā pea he atu tūtohutanga a te kaiwhakarato hau whakarewa.
Mō ngā hua pai rawa atu, whakamahia he pito whakarara me te pūwero hei whakawhiti i te hau ki te pūtake. Ko te pūwero kōniko me te kaiwhakawhiti hau kua whakauruhia hei whakarato i te kapinga tino pai.
Kia mōhio koe, mā te whakamahi i te tukanga GMAW poto-pōturi kua whakarerekētia, me te kore he hau tautoko, ka puta he iti noa te unahi i te taha muri o te whakarewa. I te nuinga o te wā ka pakarukaru tēnei i te whakamataotanga o te whakarewa, ā, ka tutuki i ngā paerewa kounga mō ngā tono hinu, tipu hiko me te matū.
Ko Jim Byrne te Kaiwhakahaere Hoko me ngā Taupānga mō Miller Electric Mfg. LLC, 1635 W. Spencer St., Appleton, WI 54912, 920-734-9821, www.millerwelds.com.
I te tau 1990, ko Tube & Pipe Journal te maheni tuatahi i whakatapua ki te mahi ki te umanga paipa whakarewa. I ēnei rā, koinei anake te pukapuka i Amerika Te Raki i whakatapua ki te umanga, ā, kua noho hei puna mōhiohio tino pono mō ngā tohunga paipa.
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