Spiral Welded Tube Arc Vuam Ntawm Cov Pa Roj Ntsig
Raunatural gas pipes, kev nyab xeeb thiab kev ntseeg siab yog qhov tseem ceeb.Arc welding plays lub luag haujlwm tseem ceeb hauv kev ua kom cov kav dej no tuaj yeem tiv taus cov xwm txheej hnyav uas lawv ntsib thaum lawv lub neej ua haujlwm.Cov txheej txheem arc vuam yog siv hluav taws xob los ua kom muaj cua sov uas ua rau cov npoo ntawm cov kav dej thiab fuses ua ke.
| Txuj | Qib hlau | Tshuaj muaj pes tsawg leeg | Tensile zog | Charpy Impact Test thiab Drop Weight Tear Test | ||||||||||||||
| C | Si | Mn | P | S | V | Nb | Ti | CEV 4 (%) | Rt0.5 Mpa Yield zog | Rm Mpa Tensile zog | Rt 0.5 / Ib | （L0 = 5.65 √ S0 ） Ntev A% | ||||||
| max | max | max | max | max | max | max | max | Lwm yam | max | min | max | min | max | max | min | |||
| L245 MB | 0.22 | 0.45 ib | 1.2 | 0.025 ib | 0.15 | 0.05 Nws | 0.05 Nws | 0.04 ib | 1) | 0.4 | 245 | 450 | 415 | 760 ib | 0.93 ua | 22 | Charpy impact test: Impact absorbing zog ntawm cov yeeb nkab lub cev thiab weld seam yuav tsum tau sim raws li qhov yuav tsum tau ua nyob rau hauv thawj tus qauv.Yog xav paub ntxiv, saib tus qauv qub.Tee hnyav kua muag kuaj: xaiv qhov chaw shearing | |
| GB/T9711-2011 (PSL2) | L290 MB | 0.22 | 0.45 ib | 1.3 | 0.025 ib | 0.015 ib | 0.05 Nws | 0.05 Nws | 0.04 ib | 1) | 0.4 | 290 | 495 ib | 415 | 21 | |||
| L320 MB | 0.22 | 0.45 ib | 1.3 | 0.025 ib | 0.015 ib | 0.05 Nws | 0.05 Nws | 0.04 ib | 1) | 0.41 ib | 320 | 500 | 430 | 21 | ||||
| L360 MB | 0.22 | 0.45 ib | 1.4 | 0.025 ib | 0.015 ib | 1) | 0.41 ib | 360 | 530 | 460 | 20 | |||||||
| L390 MB | 0.22 | 0.45 ib | 1.4 | 0.025 ib | 0.15 | 1) | 0.41 ib | 390 | 545 ib | 490 ib | 20 | |||||||
| L415 MB | 0.12 | 0.45 ib | 1.6 | 0.025 ib | 0.015 ib | 1) 2) 3 | 0.42 ib | 415 | 565 ib | 520 | 18 | |||||||
| L450 MB | 0.12 | 0.45 ib | 1.6 | 0.025 ib | 0.015 ib | 1) 2) 3 | 0.43 ib | 450 | 600 | 535 ib | 18 | |||||||
| L485 MB | 0.12 | 0.45 ib | 1.7 | 0.025 ib | 0.015 ib | 1) 2) 3 | 0.43 ib | 485 ib | 6 35 | 570 ib | 18 | |||||||
| L555 MB | 0.12 | 0.45 ib | 1.85 ib | 0.025 ib | 0.015 ib | 1) 2) 3 | Kev sib tham | 555 | 705 ib | 625 | 825 ib | 0.95 ib | 18 | |||||
| Nco tseg: | ||||||||||||||||||
| 1) 0.015 ≤ Altot ＜ 0.060；N ≤ 0.012； AI—N ≥ 2—1；Cu ≤ 0.25； Ni ≤ 0.30； Cr ≤ 0.30； Mo ≤ 0.10 | ||||||||||||||||||
| 2) V+Nb+Ti ≤ 0.015% | ||||||||||||||||||
| 3) Rau txhua qib steel, Mo yuav ≤ 0.35%, raws li daim ntawv cog lus. | ||||||||||||||||||
| 4) CEV=C+ Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/5 | ||||||||||||||||||
Ib qho ntawm cov ntsiab lus tseem ceeb uas yuav tsum tau xav txog thaum arc welding natural gas pipes yog hom kev siv vuam siv.Raukauv welded tubes, feem ntau siv txoj kev yog submerged arc vuam (SAW) tshuab.Qhov no suav nrog kev siv granular flux, uas yog nchuav rau ntawm qhov chaw vuam los tsim kom muaj kev tiv thaiv huab cua uas tiv thaiv oxidation thiab lwm yam kab mob los ntawm kev cuam tshuam cov vuam.Qhov no ua rau lub siab zoo, zoo ib yam weld nrog tsawg yam tsis xws luag.
Lwm qhov kev txiav txim siab tseem ceeb thaum arc vuam cov kav dej yog kev xaiv cov khoom siv vuam tshuab.Cov khoom siv muab tub lim yog siv los ua kom muaj qhov khoob lossis qhov tsis sib xws hauv qhov vuam, tsim kom muaj kev sib raug zoo thiab ruaj khov.Rau cov kav dej kauv welded, cov khoom siv muab tub lim yuav tsum tau siv uas yog sib xws nrog cov qib steel tshwj xeeb siv thiab cov xwm txheej ib puag ncig uas cov raj xa dej raug.Qhov no ua kom ntseeg tau tias cov vuam tuaj yeem tiv taus qhov kub thiab txias los ntawm cov kav dej ntuj.
Ntxiv nrog rau cov kev ua haujlwm ntawm arc vuam, nws tseem ceeb heev uas yuav tau xav txog cov kev tsim nyog thiab kev paub ntawm tus welder ua haujlwm.Arc welding ntawm cov kav dej ntuj tsim nyog yuav tsum muaj kev txawj ntse thiab kev txawj ntse, nrog rau kev nkag siab zoo txog cov kev sib tw tshwj xeeb thiab cov kev xav tau ntawm txoj haujlwm.Nws yog ib qho tseem ceeb rau kev ua hauj lwm nrog cov neeg paub dhau los thiab muaj ntawv pov thawj welds uas tuaj yeem tsim cov vuam zoo uas ua tau raws li kev lag luam cov qauv nruj.
Hauv kev xaus, kauv welded tube arc welded natural gas yeeb nkab yog ib qho tseem ceeb ntawm kev lag luam pipeline.Nws yuav tsum tau ua tib zoo xav txog cov txheej txheem vuam, cov ntaub ntawv muab tub lim, thiab cov kev tsim nyog ntawm cov welder ua haujlwm.Los ntawm kev ua kom cov yam ntxwv no tau txais kev saib xyuas lawv tsim nyog, nws yuav muaj peev xwm tsim cov kav dej ntuj tsim tau raws li kev lag luam cov kev cai rau kev nyab xeeb, kev ntseeg siab thiab kev ua haujlwm ntev.
