Q1: dab tsi vuam lug yog haum rau q35b kav?
A1: Q355B kav tuaj yeem welded siv ntau txoj kev, suav nrog cov ntaub thaiv hlau arc vuam (GMACE Arc Vuam (HFIW). SMAW tau siv dav rau kev teb vuam vim nws kev yooj yim thiab kev yoog tau, thaum Gmaw muab cov chaw nce nqi siab dua rau cov chaw ua haujlwm ntau lawm. Pom yog qhov nyiam rau cov kav dej tuab-walled vim nws qhov tob tob thiab siab weld hlaws dai. HFIW yog feem ntau siv nyob rau hauv cov pa yeeb kev tsim rau cov seamitudinal, muab cov nrawm thiab txuag vuam nrog cov tswv yim kub tsawg. Cov kev xaiv ntawm txoj kev nyob ntawm qhov tseeb xws li yeeb nkab tuab, ntau lawm cov ntim, thiab xav tau WELD zoo. Yog cov ntawv pov thawj tsim nyog thiab cov ntawv pov thawj rau cov ntawv pov thawj yog qhov tseem ceeb rau kev sib koom ua ke ncaj ncees.
Q2: Cov khoom siv ua ntej yuav tsum tau siv rau vuam q355b?
A2: preheating yuav tsum rau Q355b yog nyob ntawm cov khoom tuab, huab cua sov, thiab cov txheej txheem vuam. Rau cov tuab tuab hauv qab 20mm, yuav tsis tsim nyog nyob rau hauv cov xwm txheej hnyav (saum toj 5 degree). Thicker ntu (20-40mm) feem ntau yuav tsum preheating rau 100-150℃los tiv thaiv hydrogen-inducts cracking. Hauv ib puag ncig txias (<0°C) or for constrained joints, preheating up to 200°C may be needed. The interpass temperature should be maintained below 250°C to avoid excessive grain growth. Low-hydrogen electrodes (E7015, E7016) should always be used to minimize cracking risk. Thermocouples or temperature-indicating crayons verify proper preheat before welding.
Q3: Yuav ua li cas yuav tsum npaj rau Q355B kav?
A3: Weld kev npaj rau Q355B kav ua raws cov qauv kev coj ua beveling kev coj ua raws li phab ntsa thickness. Rau cov kav dej nyias (<10mm), simple square butt joints may suffice. Thicker pipes (10-25mm) require single-V or single-U bevels with 30-37.5° angles. Very thick pipes (>25mm) feem ntau siv ob-v lossis ob-u npaj kom txo qis weld ntim thiab distortion. Ib lub hauv paus ntsej muag ntawm 1-3mm thiab hauv paus sib txawv ntawm 2-4mm yog qhov raug rau kev nkag mus. Txhua qhov chaw sib koom tes yuav tsum tau ntxuav ntawm xeb, roj, thiab zeb nplai (tsawg kawg 25 hli txhua sab) siv txoj kev sib tsoo lossis tshuaj sib tsoo. Misalignment yuav tsum tau txwv tsawg dua lossis sib npaug rau 10% ntawm phab ntsa thickness lossis 2 hli siab tshaj plaws.
Q4: Dab tsi tom qab Weld Kev Kho Vaj Tse yog qhov pom zoo?
A4: Post-Weld Kev Kho Cua sov (duab) rau Q355B kav yog nyob ntawm kev yuav tsum tau ua. Kev nyuaj siab txhawb pab txhawb ntxiv ntawm 580-620℃rau 1 teev rau 25mm tuab yog ib txwm muaj rau cov ntawv tseem ceeb los txo cov kev ntxhov siab tseem ceeb. Li cas los ntawm 900-950℃yuav siv rau cov ntu hnyav rau cov qauv grade hauv thaj chaw kub-cuam tshuam (hz). Hauv zos pwht siv inting coils yog ua tau rau kev kho kom haum. Txawm li cas los xij, ntau cov ntawv thov dav dav tsis xav tau duab yog yog tias tsim nyog vuam txheej txheem ua raws. Thaum siv, cov cua sov thiab cua txias cov nqi yuav tsum tau tswj hwm ntawm tsawg dua lossis sib npaug rau 220℃/ teev los tiv thaiv kev ntxhov siab tshiab. Kev sim ua kom muaj zog soj ntsuam xyuas cov txiaj ntsig kev ua tau zoo.
Q5: Q355555555 Weldments tshuaj xyuas kom zoo?
A5: Q355B Wulls yello ntau txoj kev kuaj xyuas kom ntseeg tau zoo. Kev Ntsuam Xyuas Kev Kuaj Xyuas rau cov kev kuaj xyuas saum npoo av zoo li cov kab nrib pleb, undercut, lossis porosity. Ua kua rau kev sim ua kua (PT) tshuaj xyuas cov nplaim tawg sib xyaw hauv cov pob qij txha tseem ceeb. Sib nqus partle kuaj (MT) pom nyob ze-nto sib txawv hauv cov ntaub ntawv ferromagnetic. RadioGraphic Xeem (RT) lossis Ultrasonic kev sim (UT) ntsuas kev sib raug zoo hauv Weld sab hauv, nrog rau kev ua kom tuab. Hardness ntsuas ua kom muaj txiaj ntsig zoo tshaj plaws nyob hauv qab 350hv10 kom tiv thaiv brittle baciture. Kev kuaj xyuas sab nrauv txheeb xyuas cov txheej txheem ib ntus thiab kev tswj hwm. Soj ntsuam ntau zaus ua raws cov lej (AWS D1.1, ASME B31.3) raws li kev thov kev txaus siab.
