Cov yeeb nkab yog ntu tubular lossis lub tog raj kheej hollow, feem ntau tab sis tsis tas yuav hla ntu ntu, siv feem ntau yog xa cov tshuaj uas tuaj yeem ntws tau-kua thiab roj (kua), slurries, hmoov thiab sib tov ntawm cov khoom me me. Nws kuj tseem tuaj yeem siv rau kev thov ua haujlwm; cov yeeb nkab hollow yog qhov hnyav dua ib chav hnyav dua li cov tswv cuab.
Hauv kev siv ntau lo lus cov yeeb nkab thiab raj feem ntau hloov pauv tau, tab sis hauv kev lag luam thiab kev tsim vaj tsev, cov ntsiab lus tau piav qhia tshwj xeeb. Nyob ntawm tus qauv siv uas nws tau tsim, cov yeeb nkab feem ntau tau teev tseg los ntawm cov npe nruab nrab nrog qhov sab nraud tas li (OD) thiab lub sijhawm uas teev cov tuab. Cov raj feem ntau tau teev tseg los ntawm OD thiab phab ntsa tuab, tab sis tuaj yeem hais qhia los ntawm ob qho ntawm OD, sab hauv taub (ID), thiab phab ntsa tuab. Cov yeeb nkab feem ntau yog tsim rau ib qho ntawm ntau qhov kev lag luam thoob ntiaj teb thiab hauv tebchaws. [1] Thaum cov qauv zoo sib xws muaj nyob rau kev lag luam tshwj xeeb thov tubing, raj feem ntau ua rau kev cai ntau thiab ntau qhov dav ntawm txoj kab uas hla thiab kev zam. Muaj ntau yam kev lag luam thiab tsoomfwv cov qauv muaj rau kev tsim cov yeeb nkab thiab tubing. Lub sij hawm" raj" kuj tseem siv rau cov seem uas tsis yog cylindrical, piv txwv li, cov raj lossis cov duab plaub. Feem ntau," yeeb nkab" yog lo lus siv ntau dua hauv ntiaj teb, thaum" raj" yog siv dav dua hauv Tebchaws Meskas.
Ob leeg" yeeb nkab" thiab" raj" hais txog qib kev nruj thiab ruaj khov, qhov hose (lossis hosepipe) feem ntau yog nqa tau thiab yoog raws. Cov yeeb nkab sib dhos yuav luag ib txwm tsim nrog kev siv cov fittings xws li lub luj tshib, tees, thiab ntxiv rau, thaum lub raj yuav tsim lossis khoov rau hauv kev teeb tsa kev cai. Rau cov ntaub ntawv uas tsis tuaj yeem hloov pauv, tsis tuaj yeem tsim, lossis qhov kev tsim kho raug tswj hwm los ntawm cov lej lossis cov qauv, kev sib dhos raj kuj tseem tsim nrog kev siv cov raj txuas.
Muaj peb txheej txheem rau kev tsim cov yeeb nkab hlau. Centrifugal casting kub alloyed hlau yog ib qho ntawm cov txheej txheem tseem ceeb tshaj plaws.
Seamless (SMLS) cov yeeb nkab yog tsim los ntawm kev kos cov pob zeb khov kho hla tus pas nrig txhawm rau tsim lub hollow plhaub hauv cov txheej txheem hu ua kev tho qhov. Raws li cov txheej txheem tsim khoom tsis suav nrog kev siv vuam, cov kav dej tsis sib haum tau pom tias muaj zog dua thiab ntseeg tau ntau dua. Yav dhau los, cov yeeb nkab tsis sib haum tau suav tias yog lub zog siab dua lwm hom, thiab feem ntau muaj ntau dua li cov yeeb nkab txuas.
Kev nce qib txij li xyoo 1970s hauv cov ntaub ntawv, kev tswj hwm txheej txheem, thiab tsis yog kev puas tsuaj, tso cai kom tau txais kev qhia tshwj xeeb cov yeeb nkab txuas kom hloov pauv tsis sib haum hauv ntau daim ntawv thov. Welded yeeb nkab yog tsim los ntawm phaj ntxig thiab vuam lub seam (feem ntau yog siv hluav taws xob tiv thaiv vuam (& "; ERW &";), lossis Hluav Taws Xob Fusion Vuam (& "; EFW &";)). Lub pob nyem tuaj yeem raug tshem tawm ntawm ob sab hauv thiab sab nrauv siv daim ntaub qhwv caj dab. Thaj chaw txuas kuj tseem tuaj yeem kho cua sov kom ua rau cov nqaws tsis pom kev. Welded yeeb nkab feem ntau muaj qhov nruj qhov siab tshaj qhov tsis sib xws, thiab tuaj yeem pheej yig rau kev tsim khoom.
Muaj ntau tus txheej txheem uas yuav siv tau los tsim cov kav dej ERW. Txhua ntawm cov txheej txheem no ua rau muaj kev sib koom ua ke lossis sib koom ua ke ntawm cov hlau hauv cov kav dej. Hluav taws xob tam sim no tau dhau los ntawm qhov chaw uas yuav tsum tau txuas ua ke; raws li cov khoom siv sib txuas ua ke tiv thaiv hluav taws xob tam sim no, cov cua sov tsim tawm uas tsim cov hlau txuas. Cov hlau ntawm cov hlau yaj tau tsim nyob qhov twg ob qhov chaw txuas nrog ua lub zog hluav taws xob tau dhau los ntawm cov hlau; cov pas dej ua ke ntawm cov hlau yaj ua lub weld uas khi ob lub hauv paus sib txuas.
ERW cov kav dej yog tsim los ntawm qhov ntev txuas ntawm cov hlau. Cov txheej txheem vuam rau cov kav dej ERW txuas ntxiv mus, tsis zoo li vuam ntawm cov ntu sib txawv ntawm ntu. ERW txheej txheem siv cov hlau hlau ua khoom noj.
Cov Khoom Siv Hluav Taws Xob High Frequency Induction (HFI) siv rau kev tsim cov kav dej ERW. Hauv cov txheej txheem no, qhov tam sim no txhawm rau txhawm rau cov yeeb nkab tau thov los ntawm kev siv induction coil ncig lub raj. HFI feem ntau suav tias yog kev ua haujlwm zoo dua rau "zoo ib yam" ERW thaum tsim cov kav dej rau cov ntawv thov tseem ceeb, xws li siv rau hauv kev siv hluav taws xob, ntxiv rau lwm qhov siv hauv kab ntawv thov, nrog rau cov raj thiab tubing.
Cov yeeb nkab loj loj (25 centimeters (10 in) lossis ntau dua) tuaj yeem yog ERW, EFW lossis Submerged Arc Welded (& "; SAW &";) yeeb nkab. Muaj ob lub thev naus laus zis uas tuaj yeem siv los tsim cov kav hlau uas muaj qhov loj dua li cov kav hlau uas tuaj yeem tsim los ntawm cov txheej txheem tsis sib xws thiab ERW. Ob hom kav dej uas tsim los ntawm cov thev naus laus zis no yog qhov ntev-submerged arc-welded (LSAW) thiab kauv-submerged arc-welded (SSAW) kav. LSAW yog tsim los ntawm khoov thiab vuam dav hlau daim hlau thiab feem ntau siv hauv kev lag luam roj thiab nkev. Vim tias lawv tus nqi siab, LSAW kav dej tsis tshua siv hauv tus nqi qis uas tsis siv zog xws li cov kav dej. SSAW cov kav dej yog tsim los ntawm cov kauv (helicoidal) vuam ntawm cov hlau hlau thiab muaj tus nqi kom zoo dua li cov kav hlau LSAW, vim tias cov txheej txheem siv coils ntau dua li cov hlau phaj. Xws li, hauv cov ntawv thov uas tau muab kauv-weld siv tau, SSAW kav dej yuav zoo dua li cov kav hlau LSAW. Ob lub LSAW kav dej thiab SSAW kav sib tw tawm tsam ERW cov kav dej thiab cov kav dej tsis sib haum hauv txoj kab nruab nrab ntawm 16 "-24".
Tubing rau ntws, hlau lossis yas, feem ntau yog extruded.
