Muaj cov txheej txheem peb qho rau kev ua yeeb nkab hlau. Centrifugal casting ntawm kub alloyed hlau yog ib qho ntawm cov txheej txheem muaj txiaj ntsig tshaj plaws. Seamless (SMLS) cov yeeb nkab yog tsim los ntawm kev nqus cov thooj ntawv ntawm lub pob zeb txhaws txhawm rau txhawm rau tsim lub plhaub hollow. Raws li cov txheej txheem tsim khoom tsis suav nrog kev siv vuam txuas, cov kav dej txuas tau pom tau tias muaj zog dua qub thiab txhim khu kev qha. Keeb kwm, cov yeeb nkab tsis sib haum tau suav hais tias yog txiav siab zoo dua li lwm hom, thiab feem ntau muaj ntau dua li txuas yeeb nkab.
Kev kho ua ntej txij li xyoo 1970 nyob rau hauv cov khoom siv, kev tswj cov txheej txheem, thiab tsis yog qhov kev sim siab, ua kom tso cai rau cov khoom siv welded yeeb nkab los hloov txoj kev sib khi hauv ntau daim ntawv thov. Welded yeeb nkab yog tsim los ntawm dov cov phaj thiab vuam lub vuam (feem ntau los ntawm Electric tsis kam vuam (GG quot; ERW"), lossis Fusion Fusion Vuam (GG quot; EFW")). Lub weld nyem tau tawm ntawm ob qhov chaw sab hauv thiab sab nrauv siv lub ntsej muag qhwv caj dab. Lub chaw weld kuj tseem tuaj yeem kho kho cua sov kom ua rau cov leeg pom yooj yim dua. Welded yeeb nkab feem ntau muaj cov tawv muag ntau dua li cov qauv tsis muaj kev khi, thiab tuaj yeem pheej yig dua rau kev tsim khoom.
Muaj ntau txheej txheem uas yuav siv los tsim cov kav dej ERW. Txhua ntawm cov txheej txheem no ua rau coalescence lossis sib koom ua ke ntawm cov steel sib txuas rau hauv cov kav dej. Lub tshuab hluav taws xob hluav taws xob dhau los ntawm cov chaw uas yuav tsum tau sib xyaw ua ke; raws li lub Cheebtsam txuas nrog welded ua ke tiv taus ntawm lub tshuab hluav taws xob, cua sov yog tsim qhov twg ua ke ntawm weld. Cov pas dej ua ke ntawm cov hlau tsis sib xyaw yog tsim qhov chaw uas ob qho chaw txuas los ua lub zog hluav taws xob tam sim no dhau los ntawm cov hlau; cov chaw da dej ntawm cov hlau tsis muaj hlau ua lub weld uas khi ob txoj kab sib txuam.
ERW kav dej yog tsim los ntawm kev txuas cov kav hlau ntev. Tus txheej txheem vuam rau ERW kav dej txuas ntxiv, uas tsis zoo rau ntawm vuam ntawm cov ntu sib txawv ntawm ntu. Cov txheej txheem ERW siv cov kauj hlau ua qhov chaw yug tsiaj.
Kev Tshaj Tawm High Frequency Induction Technology (HFI) yog siv rau kev tsim cov kav dej ERW. Nyob rau hauv txoj kev no, qhov tam sim no los txuas lub yeeb nkab yog siv los ntawm txoj kev tso ua ke ib ncig ntawm lub raj. HFI feem ntau suav tias yog cov thev naus laus zis zoo tshaj "zoo tib yam" ERW thaum tsim cov kav dej rau cov kev siv tseem ceeb, xws li siv rau hauv kev siv hluav taws xob, ntxiv rau lwm yam kev siv hauv kab yeeb nkab, nrog rau cov kav hlau thiab ua raj.
Cov yeeb-tshuaj loj (25 centimeters (10 hauv) lossis siab dua) tej zaum yuav yog ERW, EFW lossis Submerged Arc Welded (GG quot; SAW") yeeb nkab. Muaj ob lub thev naus laus zis uas tuaj yeem siv los tsim cov kav hlau loj uas loj dua cov kav hlau uas tuaj yeem tsim los ntawm cov txheej txheem sib khi thiab ERW. Ob hom kav dej uas tsim los ntawm cov thev naus laus zis yog cov kav ntev-submerged arc-welded (LSAW) thiab kauv-submerged arc-welded (SSAW) kav dej. LSAW yog tsim los ntawm khoov thiab vuam dav hlau phaj thiab siv feem ntau hauv kev siv roj thiab roj. Vim tias lawv cov nqi siab, LSAW cov kav dej tsis tshua siv nyob rau hauv kev siv qis dua tus nqi tsis-siv hluav taws xob xws li cov kav xa dej. Cov kav dej SSAW yog tsim los ntawm cov kauv (helicoidal) vuam ntawm cov kav hlau thiab muaj qhov ua tau zoo ntawm LSAW cov kav dej, raws li cov txheej txheem siv cov coils ntau dua li cov phiaj hlau. Raws li xws li, hauv cov ntawv thov uas qhov kauv-weld txais tau, SSAW kav dej yuav xum dua LSAW kav. Ob qho LSAW cov kav dej thiab cov kav dej SSAW tau sib tw nrog cov kav dej ERW thiab cov kav dej uas tsis sib haum ntawm qhov ntev li ntawm 16 "-24".
Tubing rau ntws, hlau lossis yas, feem ntau extruded.
