Qhov sib txawv tseem ceeb ntawm ERW (siab zaus kuj welded) cov kav dej thiab cov kav dej seamless yog qhov muaj los yog tsis muaj vuam seam, ntau lawm technology, siab bearing peev xwm, qhov tseeb qhov tseeb thiab tus nqi. Yooj yim muab tso rau: rau kev ua haujlwm ntawm kev kub siab, kev kub siab thiab kev nyab xeeb ntxiv, cov kav dej seamless raug xaiv; rau nruab nrab thiab tsis tshua muaj siab, loj txoj kab uas hla kav thiab tej yaam num uas txwv tsis pub siv nyiaj - ERW kav.
I. Ntau lawm technology
ERW cev
Kub dov steel sawb → Leveling → Sib sau ua puag ncig, square lossis duab plaub → High zaus kuj welding los tsim longitudinal seam → Tshem tawm sab hauv thiab sab nraud burrs → Thaum tshav kub kub kho (yeem).
Nta: muajib longitudinal weld; kev sib txuas tshwm sim los ntawm melting lub hauv paus hlau tsis siv cov ntaub ntawv muab tub lim; tsis tu ncua ntau lawm, siab productivity thiab tsawg tus nqi.
Seamless kav
Khoom puag ncig steel ingot → Cua sov → Piercing (bevel lossis nias dov) → Rolling thiab sizing ntawm cov kav dej → Txias thiab ncaj → Kev kho cua sov.
Peculiarities:tsis muaj welds, cov qauv tsis sib xws thoob plaws tag nrho cov ntim ntawm cov khoom; complex technology saw, siab zog noj thiab siab nqi ntawm ntau lawm.
II. Kev sib piv ntawm cov yam ntxwv tseem ceeb ntawm kev ua haujlwm
| Qhov taw qhia | ERW cev | Seamless kav |
| Weld seam | Muaj cov seam ntev (cov yam ntxwv ua haujlwm hauv cheeb tsam seam yog me ntsis qis) | Tsis muaj seams, cov qauv hlau yog homogeneous |
| Siab bearing muaj peev xwm | Nruab nrab thiab qis siab (tsawg dua lossis sib npaug li 10 MPa); lub weld yog ib qho chaw tsis muaj zog | Kev kub siab (Ntau dua lossis sib npaug ntawm 10 MPa), ua kom muaj zog tag nrho |
| Dimensional raug | Sab nraud txoj kab uas hla ± 0.5 hli, phab ntsa thickness ± 10%; uniform phab ntsa thickness, du nto | Sab nraud txoj kab uas hla ± 0.3 hli, phab ntsa thickness ± 5%; qhov siab tshaj qhov tseeb, nto me ntsis ntxhib |
| Txoj kab uas hla | Qhov zoo tshaj tus nqi-zoo piv rau nruab nrab thiab me me diameters (tsawg dua los yog sib npaug rau 610 hli), kev tsim cov kav dej loj tuaj yeem ua tau | Qhov zoo yog qhia nrog me me diameters (tsawg dua los yog sib npaug rau 219 mm); kev tsim cov kav dej loj loj yog kim heev |
| Nqe | 20-30% pheej yig dua seamless kav | Tus nqi siab (ntau ntau lawm, qis tawm los) |
| Corrosion kuj | Txo corrosion kuj nyob rau hauv weld cheeb tsam (qhov taw qhia txhim kho tom qab kev kho cua sov) | Uniform siab corrosion kuj raws tag nrho ntev ntawm cov yeeb nkab |
III. Qhov zoo thiab qhov tsis zoo
ERW cev
✅ Qhov zoo: tus nqi qis, cov phab ntsa tuab tuab, du nto, qhov zoo ntawm qhov raug, xa khoom sai.
❌ Qhov tsis zoo: muaj cov welded seams, txo lub zog thiab corrosion kuj nyob rau hauv lub vuam cheeb tsam, kev txwv rau kev ua hauj lwm nyob rau hauv tej yam kev mob ntawm ultra-siab siab thiab tsis tshua muaj kub.
Seamless kav
✅ Qhov zoo: tsis muaj seams, siab zuag qhia tag nrho lub zog, tsis kam mus rau kev kub siab, kub hloov thiab corrosion, loj kev nyab xeeb margin.
❌ Qhov tsis zoo: tus nqi siab, siab ntev rau phab ntsa thickness, ntxhib nto, kev lag luam siv tsis zoo rau cov kav dej loj.
IV. Cov ntawv thov tseem ceeb
ERW kav dej tau pom zoo rau:
Kev thauj cov roj thiab roj ntawm nruab nrab thiab qis siab (API 5L PSL1, A53 cov qauv);
Kev xa dej, kev tso dej, kev siv roj thiab cov kav dej tua hluav taws;
Kev tsim cov khoom tsim, fencing thiab scaffolding;
Kev ua haujlwm ntawm qhov kub txog li 200℃thiab kev ua haujlwm siab tsis tshaj 6 MPa.
Seamless kav yog pom zoo rau:
Kev tsim cov kav dej boiler thiab cov kav dej superheater (tus qauv A106, P11 / P22);
Cov cuab yeej siv rau lub qhov dej thiab cov kav dej hauv qab rau cov roj thiab cov roj ntau lawm ntawm kev kub siab (API 5CT);
Kev tsim cov hydraulic kheej kheej thiab cov cuab yeej siv siab;
Эксплуатации в условиях низких (-40 °C) или сверхвысоких (>450 degree) qhov kub thiab txias, thiab nyob rau hauv qhov hnyav corrosive ib puag ncig.
V. Cov lus pom zoo rau kev xaiv
Siab thiab kub: При высоком давлении (>10 МПа), высокой температуре (>450 degree) thiab qis kub (<-20 °C) используют seamless kav; rau cov txheej txheem ntawm nruab nrab thiab qis siab - ERW kav.
Cov khoom loj: Диаметр ≤219 мм - подходят оба типа труб, приоритет отдают ERW по экономическим соображениям; диаметр 219–610 мм - оптимальный выбор ERW; диаметр >610 hli - ncaj seam submerged arc vuam LSAW kav yog siv.
Kev ruaj ntseg xav tau: Rau cov khoom siv tseem ceeb, cov hlab ntsha siab thiab cov kav dej loj - seamless kav; rau kev tsim kho pej xeem thiab hauv nroog - ERW kav.
Economic zog: Rau cov peev nyiaj tsawg thiab kev ua haujlwm hauv nruab nrab thiab tsis tshua muaj siab, xaiv ERW kav dej (tus nqi txuag ntawm 20–30%).
VI. Common Misconceptions Clarified
❌ Nqe Lus Nug: "Lub weld seam ntawm ERW kav yog ib txwm tsis muaj zog." Niaj hnub nimno technology ntawm high-frequency welding nrog kev kho cua sov tom ntej ua rau nws muaj peev xwm coj cov yam ntxwv ntawm kev ua haujlwm ntawm cov vuam mus rau cov hauv paus hlau, guaranteeing txhim khu kev qha lag luam ntawm nruab nrab thiab tsis tshua muaj siab.
❌ Nqe Lus Nug: "Cov kav dej seamless tau kaw tag nrho thiab tsis muaj qhov tsis xws luag." Seamless khoom yuav muaj dov tsis xws luag thiab microcracks; Qhov tsis xws luag hauv ERW cov kav dej yog nyob hauv cheeb tsam feem ntau hauv thaj tsam weld, uas yooj yim rau kev kuaj mob thiab kev tswj xyuas zoo.
Hauv qab kab
ERW kav dej yog qhov kev daws teeb meem zoo tshaj plaws rau kev siv nruab nrab thiab tsis tshua muaj siab, kev siv txoj kab uas hla loj thiab cov haujlwm raug nqi. Seamless kav dej yog ib qho kev xaiv rau cov khoom siv thauj khoom hnyav nrog kev nce siab, kub thiab kev nyab xeeb nruj. Kev xaiv ntawm cov yeeb nkab hom yog nqa tawm ib tus zuj zus, raws li kev ua haujlwm thiab kev txwv nyiaj txiag.
