1. Tshuaj Yim Ua Ntej Preheating Techiques
ABS YIMPreheatingRau cov hlau uas muaj cov roj ntsha muaj sib npaug (cev> 0.38%) lossis tuab> 25 hli kom tsis txhob muaj hydrogen-inducts cracking (hic).
Kub:
AH36: 50-100 degree
EH40: 100-150 degree
Thick Plates (>50 hli): Txog 200 degree
Txojkev:
Hluav Taws Xob Ua Cua Sov Matsrau cov kev faib tawm tshav kub muaj zog.
Cov nplaim hluav taws xob hauv zosrau kev kho me me.
Xyuas: Infrared thermometers kom ua raws liABS rooj 4-3 (preheat kom tau).
Preheating slows cua txias tus nqi, txo cov hwj chim loj. ABS yuav tsum muajCov ntaub ntawv Preheatrau kev tawm suab.
2. Tsawg-Hydrogen Vuam Consumables
ABS Txwv tsis pub cov xov xwm cellulose (piv txwv li, E6010) rau high-zog hlau, xav tauTsawg-hydrogen cov txheej txheem:
Cov hlau cev quav:
Lub ntsej muag: AWS E7018 (rau AH / DH36)
Fcaw: AWS E81T1-NI2 (rau EH40)
Txiav ntoo: Flux-xaim hlau sib txuas nrog tsawg dua lossis sib npaug rau 4ml / 100g diffusible hydrogen.
Chaw ntim khoom: Cov electrodes yuav tsum muab cia rau hauv110-150 Qib NcuTxhawm rau tiv thaiv kev nqus dej noo.
Daim ntawv muaj cai: ABS-pom zoo cov neeg siv nyiaj (piv txwv li,ABS-TSO CAI LOS NTAWM 3Y45) Raug rau cov kev ntsuas hydrogen hydrogen hydrogen hydrogen<5ml/100g).
Mismatch rau cov tub txu cov hlau tuaj yeem ua rauundermatching(Cov tshuaj tsis muaj zog) lossisKev sib cais(seem kev ntxhov siab).
3. Koom Tes Tsim thiab Groove Npaj
ABS yuav tsum muajBevel cov ces kaum, cov khoob khoob, thiab rov qab-gougingCailored rau phaj tuab thiab qib hlau:
V-groove vs. U-Groove:
Thickness <20mm: 60℃v-groove (ib leeg-sided weld).
Thickness> 40 hli: 20℃U-Groove (txo Weld ntim los ntawm 30%).
Rov qab-gouaging: Yuav tsum muaj rauUa tiav kev nkag mus rau kev nkag (CJP)Welds nyob rau hauv cov cheeb tsam tseem ceeb (xws li, hull seams). Carbon arc gouging yuav tsum tau ua rawsSib tsoo kom tshem tawm haz carburization.
Misalignment tsim nyog: Abs txwvcov tsis sib txawvkom tsawg dua lossis sib npaug rau 3℃thiabPeak-rau-ncov Offsetkom tsawg dua lossis sib npaug rau 10% ntawm phaj tuab.
Laser Scanning yog nce siv los ua pov thawj kev sib koom ua ke geometry ua ntej-weld.
4. Post-Weld Kev Kho Mob Cua Sov (PWHT)
For thick sections (>50 hli) lossis cov pob qij txha siab, tsis muajPWHT los ua kom muaj kev ntxhov siab zoo:
Kev ntxhov siab tau txais kev ntxhov siab:
Qho so: 580-620℃rau AH36; 600-650 Qib rau EH40.
Txog kawg: 1 teev rau 25 hli tuab.
Txojkev:
Rauv Pwhtrau cov neeg subassemblies loj.
Kev Induction Hauv Zosrau kev kho vaj tse.
Ntawv sau: Abs yuav tsumSij Hawm Sij Hawm Kubntawv pov thawj los ntawm cov kws tshuaj xyuas thib peb.
PWHT kuj txhim khoToughness hauv lub Haz, tseem ceeb rau Arctic-cov tub rog nkoj.
5. Cov kev sim ua txhaum cai (NDT)
ABS YIMNtau txoj kev NDTRaws li kev sib koom ua ke tau yooj yim:
RadioGraphic Xeem (RT): Rau cov kev nkag mus rau hauv WeldsQib D / EH Hlau(ibABS CH.6, Sec.2).
Kev Kuaj Ultrasonic (ut): Ntes Cov Ntsiab Tawm Tsam HauvTawv-phaj pob khawm Welds(Ntau dua los yog sib npaug rau 15 hli). Phased-array ut (Paut) tam sim no tsis muaj kev pom zoo rau qhov raug ntau dua.
Sib nqus Particle kuaj (MT): Rau fillet welds nyob rau hauvHigh-kev nyuaj siab aav(piv txwv li, kev sib txuas ntawm bracket).
Txais Cov Qauv Txais: ABS RAWS LI WELDS NROGcracks, lack of fusion, or slag inclusions >4mm.
Caw kaw cia ndt (piv txwv li, cov neeg nyob hauv siab) tau txais kev ua yuam kev los txo rau tib neeg kev ua yuam kev.
Tag
ABS-ua haujlwm vuam xav tauCov txheej txheem Rigor, los ntawm preheat tswj rau Advanced NDT. Cov nkoj thauj khoom hauvCaw Kaw Lus Vuam (piv txwv li, FCAW neeg hlau)thiabCov Tshuab Qaua tiav ob qho tib si ua raws thiab tus nqi nyiaj.
