Tianjin Lefin Industrial Co., Ltd yog ib qho ntawm cov tuam txhab kev paub ntau tshaj plaws thiab cov neeg muag khoom ntawm yuav ua li cas los ntsuas qhov zoo ntawm cov yeeb nkab welds hauv Suav teb. Thov koj xav tias dawb mus yuav cov khoom zoo li cas los ntsuas qhov zoo ntawm cov yeeb nkab steel welds los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.
I. Yuav Ua Li Cas Ntsuas Qhov Zoo Ntawm Cov Hlau Yeeb Nkab Welds (Kev Sib Txuas Ntawm Kev Xav thiab Kev Paub)
Theoretical hauv paus thiab tus qauv system
Kev ntsuam xyuas zoo ntawm cov yeeb nkab steel welds feem ntau yog raws li lub teb chaws cov qauv thiab kev lag luam cov cai. Cov qauv tseem ceeb suav nrog:
• GB/T 40791-2021 "Kev ntsuam xyuas tsis muaj kev puas tsuaj ntawm Welded Joints"
• GB/T 12437-2008 "Vuam Joint Ultrasonic Test Method"
• GB/T 3323-2008 "Radiographic Test Methods for Welded Joints"
• NB/T 47013 Series "Tsis yog-Kev Ntsuas Cov Khoom Siv Siab"
Cov qib kev soj ntsuam vuam tau muab faib ua peb qib:
• Qib 1 weld: 100% ultrasonic kuaj
• Secondary weld: 20% kuaj ultrasonic
• Qib 3 welds: Cov qauv piv txwv kuj tsawg, tab sis lawv yuav tsum ua kom tau raws li qhov yuav tsum tau ua.
Txoj kev tshawb nrhiav tseem ceeb (theoreticalqib)
| Txoj Kev Xeem | Txoj Cai | Siv tau qhov tsis xws luag | Standard Basis |
| Kev kuaj ultrasonic (UT) | Internal tsis xws luag yog kuaj los ntawm kev soj ntsuam cov vuam seam nrog ib tug ultrasonic sojntsuam | Internal defects (kawg, nkag mus tsis tiav, slag inclusions, thiab lwm yam) | GB/T 12437-2008 |
| Kev ntsuas hluav taws xob (RT) | Siv X-rays lossis gamma rays kom nkag mus rau hauv lub vuam seam thiab txheeb xyuas qhov tsis xws luag los ntawm cov duab | Internal defects ntawm weld seam. | GB/T 3323-2008 |
| Kev xeem Penetrant (PT) | Tshawb xyuas qhov tsis xws luag ntawm welds los ntawm cov khoom siv fluorescent | Nto qhib qhov tsis xws luag. | GB/T 42677-2023 |
| Sib Nqus Particle Test (MT) | Ua kom pom tseeb ntawm qhov tsis xws luag hauv welds los ntawm kev sib nqus quab yuam | Nto tawg. | GB/T 42673-2023 |
Cov ntsiab lus tseem ceeb ntawm kev ua tau zoo
1. Pib nrog kev tshuaj xyuas qhov muag
• Qhov saum npoo yuav tsum tsis muaj qhov tsis xws luag xws li cov kab nrib pleb, tsis tiav fusion, pores, slag inclusions, lossis arc pits.
Ntug - qhov tob tob yuav tsum tsis pub tshaj 0.5 hli, thiab qhov ntev txuas ntxiv yuav tsum tsis pub tshaj 10% ntawm tag nrho qhov ntev ntawm cov vuam.
• Weld hlaws qhov siab: 0 - 3mm rau sab nrauv phab ntsa, 0 - 4mm rau phab ntsa sab hauv. Txhua qhov siab tshaj yuav tsum tau sib tsoo.
Qhov dav weld yuav tsum yog 1 mus rau 2 millimeters wider tshaj qhov saum npoo ntawm qhov zawj.
2. Kev paub txog qhov tsis raug
• Cov kab nrib pleb: Qhov teeb meem txaus ntshai tshaj plaws. Nws yog txwv tsis pub txwv tsis pub muaj nyob rau hauv txhua qhov xwm txheej.
• Pore: Ib txoj kab uas hla tsawg dua los yog sib npaug li 3.0mm los yog T/3 (siv tus nqi me dua), cumulative txoj kab uas hla nyob rau hauv 150mm weld ntev Less tshaj los yog sib npaug rau 6.0mm los yog 0.5T
• Bar-zoo li tus slag suav nrog: Ib qhov ntev Tsawg dua lossis sib npaug li 12.0mm lossis T (siv tus nqi me dua), dav Tsawg dua lossis sib npaug li 1.5mm
• Tsis muaj kev nkag mus: tsuas yog siv tau rau ib leeg -ib leeg welds uas yuav tsum tau nkag mus rau tag nrho. h Tsawg dua lossis sib npaug li 0.2t thiab siab tshaj 2 hli.
3. Cov ntsiab lus tseem ceeb ntawm kev ua haujlwm
• Qhov kub ntawm ib puag ncig yuav tsum siab dua lossis sib npaug li 5℃. Yog tias nws qis dua 5 degree, preheating yuav tsum tau.
• Cov av noo txheeb ze yuav tsum tsis pub ntau tshaj 90%, thiab cov welding rods yuav tsum tau ua kom sov thiab qhuav.
• Cua ceev tswj: Kev ceev arc vuam Tsawg dua lossis sib npaug li 8 m / s, Gas shielded vuam Tsawg dua lossis sib npaug li 2 m / s
Lub interlayer kub yog tswj nyob rau hauv qhov ntau ntawm 150 - 250℃.
II. General Requirements rau Steel Pipe Welds
1. Cov kev xav tau zoo
Raws li SL / T 432-2024 tus qauv, qhov zoo ntawm weld seams tau muab faib ua peb pawg:
- Lub Npe Lub Npe: Chav Kawm 1 Weld Seam, Chav Kawm 2 Weld Seam, Chav Kawm 3 Weld Seam
- Crack Tsis pub Tsis pub Tsis pub
- Surface pores: d Tsawg dua lossis sib npaug ntawm 0.2s tsis pub. Qhov siab tshaj 2 hli. d Tsawg dua lossis sib npaug li 0.3s tsis pub. Qhov siab tshaj 3mm.
- Ntug tom: h Tsawg dua lossis sib npaug ntawm 0.05t, siab tshaj 0.5mm; h Tsawg dua lossis sib npaug 0.1t, siab tshaj 0.5mm; h Tsawg dua lossis sib npaug 0.2t, siab tshaj 1mm.
- Weld qhov siab: h Tsawg dua lossis sib npaug rau 0.1b + 1 (siab tshaj 5mm) h Tsawg dua lossis sib npaug rau 0.15b + 1 (siab tshaj 7mm) h Tsawg dua lossis sib npaug 0.25b + 1 (siab tshaj 10mm)
2. Dimensions thiab Geometric Requirements
• Tus nqi sib txawv: Tsawg dua lossis sib npaug li 10% ntawm phab ntsa tuab, thiab Tsawg dua lossis sib npaug li 2 hli
• Weld nrug:
Qhov kev ncua deb ntawm ob lub nplhaib ntawm qhov ncaj yuav tsum tsis pub tsawg tshaj 100 hli thiab tseem yuav tsum tsis pub tsawg tshaj li ntawm txoj kab uas hla ntawm cov yeeb nkab.
Thaum lub nominal txoj kab uas hla yog 150mm los yog ntau tshaj, lub weld spacing yuav tsum tsis muaj tsawg tshaj li 150mm.
Thaum lub nominal txoj kab uas hla yog tsawg tshaj li 150 hli, nws yuav tsum tsis muaj tsawg tshaj li lub sab nraud txoj kab uas hla ntawm cov yeeb nkab.
• Vuam txoj hauj lwm: Nws yuav tsum tsis txhob nyob rau hauv qhov chaw ntawm cov yeeb nkab. Qhov kev ncua deb ntawm qhov pib ntawm cov yeeb nkab khoov yuav tsum tsis pub tsawg tshaj 100mm thiab tsis pub tsawg tshaj li qhov ntev ntawm cov yeeb nkab.
3. Yam yuav tsum tau muaj rau tsis yog-Kev kuaj kev puas tsuaj
• Cov kav dej tseem ceeb: 100% kev kuaj hluav taws xob lossis kuaj ultrasonic
• Cov qauv xeem: NB/T 47013.2 (Radiation), NB/T 47013.3 (Ultrasonics)
• Qib Kev Tsim Nyog: Kev ntsuam xyuas hluav taws xob tau tsim nyog ntawm qib II, thiab kev kuaj ultrasonic yog tsim nyog ntawm qib I.
4. Cov txheej txheem vuam yuav tsum
• Kev ua zawv zawg: Rau cov phab ntsa nrog lub thickness ntau dua 4 hli, qhov zawj (V-puab, J-puab lossis U- zoo li) yuav tsum tau machined.
• Cov khoom siv vuam sib txuam: Nws yuav tsum sib haum nrog cov khoom siv hauv paus. Piv txwv li, E4303 vuam rods yuav tsum tau siv rau Q235B.
• Preheating yuav tsum tau: Rau carbon steel nrog phab ntsa thickness ntau dua 26mm los yog thaum lub ambient kub yog tsawg tshaj li 5 degree, preheat rau 100-150 degree.
5. Tshaj tawm - vuam kev kho
• Vuam seam tu: Tshem cov vuam slag thiab spatter.
• Acid pickling thiab passivation: Lub weld seams ntawm stainless hlau yuav tsum undergo acid pickling thiab passivation. Qhov saum npoo roughness yuav tsum tsawg dua los yog sib npaug li 0.8 μm.
• Kev kho hydrogen tshem tawm: Siab- qib steel kav (X70/X80) yuav tsum tau kho hydrogen tshem tawm ntawm 250℃rau 2 teev.
6. Cov Lus Qhia Tshwj Xeeb
• Cov raj xa dej siab: yuav tsum tau kuaj dej siab. Kev ntsuas siab yuav tsum yog 1.5 npaug ntawm qhov tsim siab.
• Hydraulic Engineering: Ua raws li SL/T 432-2024. Class I welds xav tau cov kev cai nruj tshaj plaws.
• Kev lag luam Petrochemical: Ua raws li tus qauv SH 3501. Rau cov kav dej uas nqa cov tshuaj lom thiab cov nplaim taws, yuav tsum muaj cov qauv siab dua.
Cov ntsiab lus
Kev txiav txim siab zoo ntawm cov yeeb nkab steel welds yuav tsum muaj kev sib xyaw ua ke ntawm cov txheej txheem theoretical thiab kev ua haujlwm. Nws suav nrog ntau- kev ntsuas qhov ntev xws li kev tshuaj xyuas qhov muag, tsis yog- kev ntsuas kev puas tsuaj, thiab ntsuas qhov ntev. Feem ntau, nws suav nrog cov yam ntxwv zoo li qhov zoo, qhov ntev ntev, tsis yog -kev ntsuas kev puas tsuaj, thiab kev tswj cov txheej txheem vuam. Cov qauv tshwj xeeb yuav tsum raug xaiv raws li kev thov ntawm cov kav dej (cov kav dej siab, cov dej txuag dej, petrochemicals, thiab lwm yam).
Cim npe nrov: Yuav ua li cas los ntsuas qhov zoo ntawm steel yeeb nkab welds, Tuam Tshoj, lwm tus neeg, manufacturers, hoobkas, nqe
