Txhim kho covqaug zog kujntawm Q355Dsteel nyob rau hauv cua turbine ntauwd manufacturing yog ib tug multi-fab fab kev sib tw engineering. Thaum Q355D nws tus kheejmuaj zog toughness ntawm -20 degree, nws qaug zog kev ua tau zoo nyob rau hauv lub relentless, siab - voj voog, variable-amplitude loading ntawm ib tug cua turbine yog qhov tseem ceeb rau tus qauv 20-25 xyoo tsim lub neej.
Lub hom phiaj yuav tsum yog kom txo qis kev ntxhov siab, khaws cia cov khoom siv ncaj ncees, thiab ua kom cov khoom tsis zoo.
Nov yog ib qho kev qhia dav dav:
1. Kev tsim kho kom zoo kom txo tau kev ntxhov siab
Qhov no yog txoj hauv kev zoo tshaj plaws los txhim kho lub cev qaug zog.
Optimized Section Transitions: Siv cov thav duab me me hauv cov seem conical ntauwd es tsis txhob hloov txoj kab uas hla sai. Txhua qhov kev hloov pauv geometry yuav tsum muaj dav dav radii.
Flange thiab Qhov Rooj Qhib Tsim: Txhim kho lub qhov rooj, lub qhov taub, thiab cov hluav taws xob nkag mus rau qhov qhib nrog ob daim hlau los yog forged / nias lub nplhaib kom rov faib cov kev ntxhov siab. Zam cov kaum ntse ntse; siv cov qhov qhib qhib.
Internal Platform Connections: Tsim cov platforms thiab cov ntaiv sab hauv nrog cov kev sib txuas yooj yim (xws li, qhov sib txuas, cov mounts resilient) los tiv thaiv lawv los ntawm kev ua tsis tau raws li kev xav tau-cov tswv cuab uas tsim kev ntxhov siab hauv zos "kub qhov chaw" hauv phab ntsa ntauwd.
2. Fabrication & Vuam: Theem tseem ceeb
Kev qaug zog tawg yuav luag ib txwm pib ntawm welds. Yog li ntawd, weld zoo thiab nthuav dav yog txhua yam.
A. Weld Joint Tsim & Npaj
Tag Nrho Kev Sib Tw: Siv ob -sab pob tw welds (los yog ib qho -ib sab nrog rov qab khiav thiab rov qab-gouging) rau tag nrho cov thawj circumferential (kab rov tav) thiab longitudinal ( ntsug) seams. Tsis muaj fillet welds rau thawj thauj khoom thauj.
Weld Profile Control: Ua tiav qhov du, concave weld cap profile nrog kev hloov maj mam mus rau lub hauv paus hlau (sib tsoo weld ntiv taw yog qhov yuav tsum tau ua). Qhov no txo cov kev ntxhov siab concentration (Kt).
Haum-Up Accuracy: Xyuas kom meej meej sib dhos. Misalignment (hi-lo) ua rau muaj kev ntxhov siab nyob rau theem nrab khoov, yog tus tua neeg qaug zog loj. Kev kam rau siab yuav tsum yog <10% ntawm phaj tuab lossis 2 hli, qhov twg me dua.
B. Vuam txheej txheem & txheej txheem tswj
Txheej Txheem Xaiv: Siv Submerged Arc Vuam (SAW) rau longitudinal/circumferential seams. Nws muab kev nkag mus tob, zoo siab, thiab zoo heev profile sib xws. Gas Hlau Arc Vuam (GMAW) yog tsim rau me me welds.
Kev ua raws li WPS nruj: Ua raws li cov txheej txheem vuam tsim nyog (WPS) nrog kev tswj hwm, nruab nrab cov cua sov nkag kom tsis txhob muaj cua sov loj, nkig-Teb chaws cuam tshuam (HAZ).
Tsawg-Hydrogen Practice: Siv ci electrodes/fluxes los tiv thaiv hydrogen-induced cracking, uas ua raws li ib tug qaug zog pib.
C. Tshaj tawm -Kev kho Weld (Qhov kev txhim kho ncaj qha tshaj plaws)
ntiv taw sib tsoo: Tsis yog -negotiable. Sib tov tag nrho cov longitudinal thiab circumferential weld toes kom tshem tawm cov undercut, slag intrusion, thiab tsim ib tug du vojvoog. Qhov no tuaj yeem ua rau qaug zog ntawm 30-50%.
Peening Method: Rau cov pob qij txha tseem ceeb, siv:
Rauj Peening: Siv cov cuab yeej sib npaug los ua kom cov yas deform ntawm cov ntiv taw ntiv taw, ua rau muaj txiaj ntsig zoo compressive residual stresses.
Siab -Kev Kho Mob Zaus (HiFIT)/Ultra Sonic Impact Treatment (UIT): Cov txheej txheem siab heev uas ua kom lub neej qaug zog ntau dhau los ntawm kev tsim cov txheej txheem sib sib zog nqus, ruaj khov thiab ua kom zoo dua qhov chaw microstructure.
3. Cov khoom siv thiab kev tswj xyuas zoo
Plate Quality: Qhia meej "Z-kev taw qhia" (los ntawm-} tuab) cov khoom (xws li Z15, Z25) kom tiv thaiv lamellar tearing hauv cov pob qij txha nruj heev (xws li flange rings).
Dimensional Tolerances: Kev tswj nruj ntawm phaj flatness thiab cylindricity kom txo qis "tawm- ntawm- roundness" thiab xav tau kev kho lub zog thaum lub sij hawm erection.
Tsis yog -Kev Ntsuas Kev Puas Tsuaj (NDT):
100% Ultrasonic Testing (UT) ntawm tag nrho cov pob tw welds.
Sib Nqus Particle Testing (MT) ntawm tag nrho cov ntiv taw weld tom qab sib tsoo.
Qhov no ua kom tsis muaj qhov tawg - pib qhov teeb meem tshwm sim.
4. Kev tsim kho thiab hauv -Kev txiav txim siab txog kev pabcuam
Bolt Preload Control: Rau flanged ntauwd kev sib txuas, siv hydraulic tensioners los yog calibrated torque wrenches kom zoo ib yam, siab preload nyob rau hauv lub bolts. Qhov no ua kom lub ntsej muag flange nyob twj ywm hauv compression thaum lub sijhawm ua haujlwm, hloov chaw ntawm kev sib txhuam thiab tiv thaiv cov bolts los ntawm qaug zog.
Kev Tiv Thaiv Corrosion: Tswj cov txheej txheem txheej txheej. Corrosion pits yog lub zog qaug zog tawg pib. Qib "D" toughness tsis cuam tshuam yog pitting corrosion tshwm sim.
Fatigue Life Enhancement Strategy Summary Table
| Theem | Ntsiab Action | Mechanism ntawm Fatigue Txhim Kho |
|---|---|---|
| Tsim | Optimize geometry; siv dav radii; txhawb qhov qhib. | Txo cov txheej txheem kev ntxhov siab concentration (K_s). |
| Fabrication (Vuam) | Siv tag nrho - nkag mus rau pob tw welds; xyuas kom meej meej. | Tshem tawm qhov cuam tshuam los ntawm kev nkag mus los ntawm ib nrab lossis misalignment. |
| Ncej -Kev kho Weld | Sib tov tag nrho cov ntiv taw weld kom du profile. Thov HFIT/UIT peening. | 1. Txo geometric stress concentration (K_t). 2. Induces sib sib zog nqus compressive residual kev nyuaj siab, counteracting tensile qaug zog loads. |
| Kev Tswj Xyuas Zoo | 100% UT / MT ntawm welds; qhia Z-qib steel rau cov phaj tuab. | Tshem tawm cov teeb meem sab hauv (slag, tawg) uas yog cov pib tawg. |
| Txhim kho | Xyuas kom zoo ib yam, siab bolt preload nyob rau hauv flange kev twb kev txuas. | Hloov thauj khoom ntawm kev sib txhuam, tiv thaiv bolts thiab flange los ntawm kev ntxhov siab cyclic. |
Xaus
Koj tsis tuaj yeem hloov qhov S-N nkhaus (kev ntxhov siab thiab lub voj voog mus rau qhov tsis ua haujlwm) ntawm Q355D puag hlau. Yog li ntawd, tag nrho cov tswv yim yog los xyuas kom meej tias qhov kawg qauv ua tau zoo li ze rau lub hauv paus hlau lub intrinsic qaug zog txwv li sai tau.
Qhov no yog ua tiav los ntawm:
Tsim tawm cov kev ntxhov siab.
Fabricating zoo meej welds thiab tom qab ntawd txhim kho lawv ntawm cov ntiv taw sib tsoo thiab peening.
Kev tshuaj xyuas tsis tu ncua kom tshem tawm qhov tsis xws luag.
Rau cov cua turbine towers, tom qab-weld kev kho mob (sib tsoo + peening) ntawm circumferential welds ntawm tus pej thuam segments 'ends (qhov twg khoov lub sij hawm yog siab tshaj) feem ntau yog ib tug xwb feem ntau tus nqi- zoo ntsuas rau dramatically ncua lub neej qaug zog. Cov txheej txheem no nquag teev nyob rau hauv cov qauv tsim ntauwd thiab los ntawm cov turbine loj OEMs.