1. Cov txheej txheem vuam tsis xav tau cov khoom siv vuam (hloov los ntawm cov yeeb nkab nthuav dav).Cov yeeb nkab steel yog muab tso rau hauv lub qhov (socket) ntawm cov yeeb nkab haum, thiab qhov kawg ntawm cov kabmob yog welded nyob rau hauv ib lub voj voog nrog tungsten argon arc vuam (GTAW) kom yaj cov yeeb nkab rau hauv ib lub cev.Lub vuam seam thiab cov raj xa dej sib xyaw ua ke, cov xim zoo ib yam, thiab cov khoom siv vuam vuam tuaj yeem raug tshem tawm, thiab qhov vuam ceev tuaj yeem txhim kho.

2. Tom qab cov kev ntsuam xyuas ntawm lub siab tsis kam, airtightness, kos duab, tsis zoo siab, thiab ntsev tsuag, kev sib txuas lub zog thiab sealing kev ua tau zoo ntawm cov yeeb nkab fittings muaj cuab kev zoo dua lwm txoj kev sib txuas;nws muaj ntau yam kev siv, thiab qhov "kev sib txuas tsis sib txuas" txoj kev sib txuas muaj qhov zoo tshwj xeeb tshwj xeeb hauv cov kav dej, cov phab ntsa thiab lwm lub sijhawm, txuag kev ua haujlwm thiab cov khoom siv, kev saib xyuas yooj yim, thiab ua tau raws li kev tiv thaiv ib puag ncig.

3. Kev ua tau zoo tshaj plaws, cov yeeb nkab yooj yim haum qauv, pom tseeb tus nqi kom zoo dua, muaj kev nyab xeeb thiab txhim khu kev qha, ruaj khov, zoo nkauj tsos, kev tiv thaiv ib puag ncig, thiab kev huv, yooj yim rau siv thiab tswj.