1. Cov tsos mob soj ntsuam ntawmluj tshib fittings: Feem ntau, qhov kev ntsuam xyuas qhov muag liab qab yog txoj hauv kev tseem ceeb. Los ntawm kev tshuaj ntsuam xyuas, nws tuaj yeem pom qhov tsis xws luag ntawm vuam lub luj tshib yeeb nkab fittings, thiab qee zaum siv 5-20 npaug ntawm cov iav tsom iav los tshawb xyuas. Xws li ntug tom, porosity, vuam qog, nto tawg, slag inclusion thiab nkag mus, thiab lwm yam. Cov duab qhov ntev ntawm cov vuam kuj tuaj yeem ntsuas los ntawm cov khoom siv vuam los yog cov qauv.

2. Kev tshuaj xyuas tsis zoo ntawm lub luj tshib yeeb nkab fittings: kev tshuaj xyuas ntawm slag, porosity, tawg thiab lwm yam tsis xws luag muab zais rau hauv qhov vuam. Kev tshuaj xyuas X-ray yog siv X-ray los thaij duab ntawm lub vuam seam, raws li qhov kev xav tsis zoo los txiav txim siab seb puas muaj cov teeb meem sab hauv, tus naj npawb thiab hom kev puas tsuaj. Tam sim no qhov kev siv ntau tshaj plaws yog xaiv kev kuaj X-ray, nrog rau kev tshuaj xyuas ultrasonic thiab kev soj ntsuam sib nqus. Tom qab ntawd raws li cov khoom yuav tsum tau muaj peev xwm txheeb xyuas seb lub vuam puas tsim nyog. Nyob rau ntawm no, reflected nthwv dej tshwm ntawm qhov screen. Raws li kev sib piv thiab kev txheeb xyuas ntawm cov kev cuam tshuam no nrog cov nthwv dej ib txwm muaj, qhov loj thiab qhov chaw ntawm qhov tsis xws luag tuaj yeem txiav txim siab. Ultrasonic flaw detection yog ntau yooj yim dua X-ray, yog li nws yog dav siv. Txawm li cas los xij, kev tshuaj xyuas ultrasonic tsuas yog txiav txim los ntawm kev ua haujlwm dhau los, thiab tsis tuaj yeem tawm hauv kev tshuaj xyuas. Lub nqaj ultrasonic yog xa los ntawm kev sojntsuam mus rau hauv cov hlau, thiab thaum nws ncav cuag cov hlau-cua interface, nws refracts thiab dhau los ntawm cov vuam. Yog tias muaj qhov tsis xws luag hauv qhov vuam, lub nqaj ultrasonic yuav raug cuam tshuam rau qhov kev sojntsuam thiab yuav tsum tau yug los, rau qhov tsis xws luag sab hauv ntawm qhov chaw vuam tsis sib sib zog nqus thiab cov tsos ntawm cov kab nrib pleb me me, kev sib nqus qhov tsis zoo kuj tuaj yeem siv tau.

3. Cov khoom siv ntawm lub luj tshib yeeb nkab kuaj: kev kuaj tsis muaj kev puas tsuaj tuaj yeem pom qhov tsis xws luag ntawm cov vuam, tab sis tsis tuaj yeem qhia meej cov khoom siv ntawm cov hlau nyob rau hauv qhov kub ntawm qhov cuam tshuam ntawm qhov vuam, yog li qee zaum ua kom nruj, cuam tshuam, khoov thiab lwm yam kev sim ntawm welded sib koom. Cov kev sim no yog ua los ntawm pawg thawj coj sim. Cov phaj xeem siv yog qhov zoo tshaj plaws welded ua ke nrog lub longitudinal seam ntawm lub tog raj kheej kom ntseeg tau tias kev tsim kho zoo ib yam. Tom qab ntawd cov khoom siv hluav taws xob ntawm cov phaj xeem raug kuaj. Hauv kev xyaum, tsuas yog cov pob qij txha ntawm cov hlau tshiab tau sim hauv qhov kev hwm no.

4. Lub luj tshib yeeb nkab kev ntsuas siab thiab kev ntsuas siab: rau lub siab lub nkoj sealing qhov yuav tsum tau, kev ntsuas dej siab thiab (lossis) kev ntsuas siab, txhawm rau xyuas qhov kev sib khi thiab siab muaj peev xwm ntawm qhov vuam. Cov txheej txheem yog txhaj 1.25-1.5 npaug ntawm kev ua haujlwm siab ntawm cov dej los yog sib npaug ntawm kev ua haujlwm siab ntawm cov pa roj (feem ntau nrog cov cua) rau hauv lub thawv, nyob rau ib lub sijhawm, thiab tom qab ntawd tshawb xyuas qhov poob siab hauv lub thawv, thiab tshawb xyuas seb muaj kev tawm sab nraud, raws li cov no tuaj yeem txheeb xyuas seb qhov vuam puas tsim nyog.