Kei te huri haere te ao hangahanga i roto i tētahi panonitanga puku engari kaha. Mō ngā tekau tau, ko ngā tikanga whakarewa tuku iho pērā i te Tungsten Inert Gas (TIG) me te Metal Inert Gas (MIG) te pou tuarā o te hanga whakarewa. Heoi, he maha ngā wā ka raru ēnei tukanga tawhito i ngā arai ā-roto. Ko te nui o te whakaurunga wera ka arahi ki te whakapōturitanga o ngā rauemi, ko te pikinga ako mō ngā kaiwhakarewa mohio ka puta he korenga o ngā kaimahi. Hei tāpiri, ko te puhoi o te tukatuka o te whakarewa ā-ringa e whakawhāiti ana i te kaha o te mahi i roto i ngā taiao whakaputa tere. I te mea e hiahia ana ngā ahumahi ki te tika me te kounga ataahua teitei ake, kua hiahiatia he nekehanga tauira ki ngā hangarau ngāwari ake.