Daim ntawv thov ntawm kev tiv thaiv cov roj gas yog txwv feem ntau los ntawm tus nqi ntawm cov roj, tus nqi ntawm cov khoom siv, thiab los ntawm qhov chaw ntawm qhov vuam. Qee cov khoom siv tiv thaiv, xws li argon, yog kim, txwv nws siv. Cov cuab yeej siv rau kev xa cov pa roj kuj yog tus nqi ntxiv, thiab vim li ntawd, cov txheej txheem zoo li shielded hlau arc vuam, uas yuav tsum tau siv cov cuab yeej tsis tshua kim, yuav nyiam nyob rau qee lub sijhawm. Thaum kawg, vim hais tias atmospheric txav tuaj yeem ua rau tawg ntawm cov roj tiv thaiv ib puag ncig ntawm lub vuam, cov txheej txheem vuam uas yuav tsum tau muaj cov roj thaiv thaiv feem ntau tsuas yog ua hauv tsev, qhov chaw ib puag ncig ruaj khov thiab cov pa cua tuaj yeem tiv thaiv kom tsis txhob nkag mus rau hauv qhov chaw vuam.
Qhov kev xav tau ntawm cov roj ntws yog nyob ntawm qhov kev sib txuas ntawm cov geometry, ceev, tam sim no, hom roj, thiab cov hlau hloov hom siv. Vuam cov chaw tiaj tus yuav tsum tau muaj dej ntws ntau dua li cov khoom siv vuam grooved, vim tias cov roj tau tawg sai dua. Kev nrawm nrawm dua, feem ntau, txhais tau hais tias yuav tsum tau siv roj ntau ntxiv los muab kev pabcuam txaus. Tsis tas li ntawd, qhov siab dua tam sim no yuav tsum tau muaj dej ntau dua, thiab feem ntau, helium ntau dua yuav tsum tau muab kev pabcuam txaus tshaj li argon. Tej zaum qhov tseem ceeb tshaj plaws, plaub qhov kev hloov pauv ntawm GMAW muaj qhov sib txawv ntawm kev tiv thaiv cov roj ntws tawm-rau cov pas dej me me ntawm cov luv luv Circuiting thiab cov twj tso kua mis, txog 10L/ min (20 ft3/h) feem ntau tsim nyog, thaum hloov mus rau globular, nyob ib ncig ntawm 15 L / min (30 ft3/h) nyiam dua. Kev hloov pauv hloov pauv ib txwm xav tau ntau dua vim tias nws cov khoom siv hluav taws xob ntau dua thiab yog li lub pas dej loj dua; raws kab ntawm 20-25 L / min (40-50 ft3/h).
