Ehara i te mea uaua te mahi me te maitai kore waikura, engari me aro nui ki ngā taipitopito mō tōna whakarewanga. Kāore e mimiti te wera pērā i te maitai ngawari, te konumohe rānei, ā, ka ngaro pea te ātete ki te waikura mēnā ka wera rawa. Mā ngā tikanga pai ka mau tonu tōna ātete ki te waikura. Whakaahua: Miller Electric
Nā te ātete ki te waikura o te maitai kore waikura, he mea ātaahua tēnei mō ngā mahi paipa maha, tae atu ki ngā ahumahi kai me inu parakore, rongoā, oko pēhanga me te hinu matū. Heoi, kāore tēnei rauemi e mimiti wera pērā i te maitai ngawari, te konumohe rānei, ā, ka taea e te whakarewatanga hē te whakaiti i tōna ātete ki te waikura. Ko te nui rawa o te wera me te whakamahi i te konganuku whakakī hē ngā take e rua.
Mā te piri ki ētahi o ngā tikanga whakarewa maitai kore waikura pai rawa atu ka āwhina i te whakapai ake i ngā hua me te whakarite kia mau tonu te ātete ki te waikura o te konganuku. Hei tāpiri, mā te whakapai ake i te tukanga whakarewa ka taea te whakanui ake i te hua me te kore e whakaiti i te kounga.
I te wā e whakarewahia ana te maitai kore waikura, he mea nui te whiriwhiri i te konganuku whakakī hei whakahaere i te nui o te waro. Me whakapai ake ngā konganuku whakakī e whakamahia ana hei whakarewa i ngā paipa maitai kore waikura, ā, me tika hoki mō te whakamahinga.
Rapua ngā konganuku whakakī kua tohua ki te "L" pērā i te ER308L nā te mea he iti ake te ihirangi waro mōrahi e whakarato ana, ā, ka āwhina i te pupuri i te ātete waikura i roto i ngā koranu maitai kore waikura waro iti. Mā te whakarewa i te konganuku turanga waro iti ki ngā konganuku whakakī paerewa ka whakanui ake i te ihirangi waro o te hononga whakarewa, ka piki ake te tūponotanga o te waikura. Āta karohia ngā konganuku whakakī kua tohua ki te "H" nā te mea he nui ake te ihirangi waro e whakarato ana, ā, he mea hanga mō ngā tono e hiahia ana kia kaha ake i ngā pāmahana teitei.
I te wā e whakarewahia ana te maitai kore waikura, he mea nui hoki te whiriwhiri i tētahi konganuku whakakī he iti noa ngā taumata paru (e mōhiotia ana ko ngā poke) o ngā huānga. Ko ēnei ngā huānga toenga i roto i ngā rauemi mata e whakamahia ana hei hanga konganuku whakakī, tae atu ki te antimony, te arsenic, te phosphorus me te whanariki. Ka taea e rātou te pā nui ki te ātete waikura o te rauemi.
Nā te mea he tino tairongo te maitai kore waikura ki te wera e uru mai ana, he mea nui te whakarite hononga me te huihuinga tika ki te whakahaere i te wera hei pupuri i ngā āhuatanga o te rauemi. Mēnā he āputa i waenga i ngā wāhanga, he taunga koretake rānei, me noho roa te rama ki te wāhi kotahi, ā, me nui ake te konganuku whakakī hei whakakī i aua āputa. Ka taea e tēnei te whakanui ake i te wera ki te wāhi e pāngia ana, ka wera rawa ai te wāhanga. Mēnā he taunga kore, ka uaua hoki te whakakī i te āputa me te whiwhi i te urunga e hiahiatia ana o te whakarewa. Kia tupato ki te hono i ngā wāhanga ki te maitai kore waikura kia tata rawa atu.
He mea tino nui hoki te parakore o tēnei rauemi. Mēnā he iti noa ngā poke, ngā paru rānei i roto i ngā hononga whakarewa, ka pāngia pea te hua whakamutunga e ngā hapa, ka whakaiti i te kaha me te ātete ki te waikura. Hei horoi i te papa i mua i te whakarewa, whakamahia he paraihe kowiri tira motuhake kāore anō kia whakamahia ki te maitai waro, ki te konumohe rānei.
I roto i te maitai kore waikura, ko te whakaaweawe te tino take o te ngaronga o te ātete ki te waikura. Ka puta pea tēnei ina tino rerekē te pāmahana whakarewa me te tere whakamatao, ka hua ake he panoni ki te hanganga moroiti o te rauemi.
He rite te āhua me te kounga o tēnei whakarewa o waho i runga i te paipa kowiri tira, he mea whakarewa ki te GMAW me te konganuku tāpae whakahaeretia (RMD) me te kore he horoi pakiaka, ki ngā whakarewa horoi GTAW.
Ko tētahi wāhanga matua o te ātete waikura o te maitai kore waikura ko te chromium oxide. Engari ki te nui rawa te ihirangi waro o te whakarewa, ka puta te chromium carbide. Ka herea e rātou te chromium, ka ārai i te hanganga o te chromium oxide e hiahiatia ana, ka hoatu ki te maitai kore waikura tōna ātete waikura. Ki te kore e ranea te chromium oxide, kāore te rauemi e whai i ngā āhuatanga e hiahiatia ana, ā, ka puta te waikura.
Ko te ārai i te whakararuraru ka whakawhirinaki ki te whiriwhiri i te konganuku whakakī me te whakahaere i te whakauru wera. E ai ki te kōrero i mua ake nei, he mea nui kia whiriwhiria he konganuku whakakī he iti te ihirangi waro i te wā e whakarewahia ana te maitai kore waikura. Heoi, i ētahi wā ka hiahiatia te waro hei whakarato i te kaha mō ētahi mahi. He mea nui rawa te whakahaere i te pāmahana ina kore e pai ngā konganuku whakakī waro iti.
Whakaitihia te roa o te noho o te rohe e pāngia ana e te wera me te whakarewa ki ngā pāmahana teitei, arā, 950 ki te 1500 nekehanga Fahrenheit (500 ki te 800 nekehanga Celsius). Ka iti ake te wā e pau ana ki te whakapiripiri i roto i tēnei awhe, ka iti ake te wera e puta mai ana. Me tirotiro tonu te pāmahana i waenga i ngā hononga i te wā e whakapiripiri ana.
Ko tētahi atu kōwhiringa ko te whakamahi i ngā konganuku whakakī me ngā wāhanga whakakoi pērā i te titanium me te niobium hei ārai i te hanganga o te chromium carbide. Nā te mea ka pāngia hoki e ēnei wāhanga te kaha me te pakari, kāore e taea te whakamahi i ēnei konganuku whakakī i roto i ngā tono katoa.
Ko te whakarewatanga o te arc tungsten root weld (GTAW) he tikanga tuku iho mō te whakarewa i ngā paipa kowiri tira. I te nuinga o te wā ka hiahiatia he whakamātao argon hei ārai i te waikura i te taha raro o te whakarewatanga. Heoi, kei te piki haere te whakamahinga o ngā tukanga whakarewatanga waea i roto i ngā paipa kowiri tira. I ēnei wā, he mea nui kia mārama ki te pānga o ngā hau ārai rerekē ki te ātete waikura o te rauemi.
I te wā e whakarewahia ana te maitai kore waikura mā te whakamahi i te whakarewa pewa hau (GMAW), ko te tikanga i whakamahia ko te argon me te hauhā waro, he ranunga o te argon me te hāora, he ranunga hau-toru rānei (helium, argon me te hauhā waro). Ko te tikanga, ko te nuinga o ēnei ranunga he argon, he helium rānei, ā, he iti iho i te 5% te hauhā waro nā te mea ka whakaurua te waro e te hauhā waro ki roto i te puna whakarewa, ā, ka nui ake te tūponotanga o te pāwera. Kāore i te tūtohutia te argon parakore mō te GMAW i runga i te maitai kore waikura.
Kua hangaia te waea kua whakakīia ki te kowiri tira kia whakamahia he ranunga tuku iho o te 75% argon me te 25% waro hauhā. Kei roto i te rerenga ngā kai kua hangaia hei ārai i te poke o te whakarewa e te waro mai i te hau ārai.
I te whanaketanga o ngā tukanga GMAW, i māmā ake ai te whakarewa i ngā ngongo me ngā paipa kowiri tira. Ahakoa e hiahiatia tonutia ana te tukanga GTAW i ētahi tono, ka taea e ngā tukanga tukatuka waea matatau te whakarato i te kounga ōrite me te hua teitei ake i roto i te maha o ngā tono kowiri tira.
He rite te kounga me te āhua o ngā whakarewa kowiri tira ID i hangaia ki te GMAW RMD ki ngā whakarewa OD e rite ana.
Mā te whakamahi i te tukanga GMAW porowhita poto whakarerekētia pērā i te Miller's controlled metal deposition (RMD) ka whakakorea te backwash i roto i ētahi tono maitai kore waikura austenitic. Ka taea te whai i te RMD root pass mā te pulsed GMAW, te flux-cored arc welding rānei hei whakakī me te kati, he huringa e penapena ana i te wā me te moni ki te whakataurite ki te whakamahi i te backflushed GTAW, inā koa i runga i ngā paipa nui.
Ka whakamahia e te RMD te whakawhiti konganuku poto-ara iahiko e whakahaeretia ana kia puta ai he pewa marino, he pūmau hoki te puna whakarewa. Ko te hua o tēnei he iti ake te tūponotanga o te rere makariri, te kore rānei e rewa, he iti ake te tauhiuhi, ā, he pai ake te kounga o te putanga pakiaka o te paipa. Mā te whakawhiti konganuku e whakahaeretia ana kia tika te whakahaere ka whakarite kia ōrite te whakatakotoranga o ngā pata me te ngāwari ake o te whakahaere i te puna whakarewa, ā, nō reira ka tere te whakauru wera me te whakarewa.
Ka taea e ngā tukanga rerekē te whakapai ake i te hua o te whakarewa. Ina whakamahia te RMD, ka taea te tere o te whakarewa mai i te 6 ki te 12 inihi/min. Nā te mea ka whakapai ake te tukanga i te hua me te kore e whakamahana anō i ngā wāhanga, ka āwhina i te pupuri i ngā āhuatanga me te ātete ki te waikura o te maitai kore waikura. Mā te whakaiti i te wera e uru mai ana i te tukanga ka āwhina anō hoki ki te whakahaere i te whakarerekētanga o te papa.
Mā tēnei tukanga GMAW pāorooro ka poto ake te roa o ngā pewa, ka whaiti ake ngā koeko pewa, ā, ka iti ake te wera e uru mai ana i te whakawhiti rehu pāorooro noa. Nā te mea kua kati te tukanga, ka tata kore te nekeneke o te pewa me ngā rerekētanga o te tawhiti i waenga i te pito me te mea mahi. Mā tēnei ka māmā ake te whakahaere i te puna whakarewa me te whakarewa me te kore whakarewa i te papaanga. Hei whakamutunga, mā te whakakotahitanga o te GMAW pāorooro mō te whakakī me te hurihanga o runga me te RMD mō te hurihanga pakiaka ka taea te mahi i tētahi tukanga whakarewa mā te whakamahi i tētahi waea kotahi me tētahi hau kotahi, ka whakaiti i te wā whakawhiti tukanga.
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