1. Dab tsi yog qhov kev txiav txim siab tseem ceeb thaum VAV P91 Cov Khoom Siv?
VACT P91 yuav tsum muaj kev saib xyuas nyab thiab zoo-}}}}} Qhov tsim nyog warding txheej txheem (WPS). Preheating, typically in the range of 200-250℃(392-482℃F), is mandatory to prevent hydrogen-induced cold cracking. Kev tswj nruj ntawm kev cuam tshuam qhov kub, feem ntau capped ntawm 300℃(572℃(yog qhov tsim nyog kom tsis txhob muaj kev loj hlob ntau hauv lubz. Kev siv cov txheej txheem hydrogen heev heev thiab ci qis - hydrogen electrodes tsis yog sib ceg. Thaum kawg, ib qho kev kho mob ntxiv thiab tam sim ntawd tom qab Weld (PWHT) yuav tsum ua raws li Weld ua tiav.
2. Vim li cas thiaj yuav tsum muaj cov chaw ua haujlwm me me yuav siv tau rau vuam p91?
Cov chaw ua haujlwm tshwj xeeb cov hlau yuav tsum tau siv los ua tiav weld hlau muaj pes tsawg leeg thiab cov khoom uas phim cov hlau hauv paus. Feem ntau, txuam cov chemical elecistry zoo li E9015 - b9 lossis cov xov hlau nyiam er90s-b9 yog siv. Cov fillers muaj cov zoo sib xws ntawm Cr, Mo, V, thiab NB kom ntseeg tau lub zog thiab nkag mus hla kev sib koom ua ke. Siv cov tub rog tsis raug, xws li ib qho rau P22, yuav ua rau muaj kev sib koom ua ke tsis muaj zog uas tsis tuaj yeem tiv thaiv cov qauv tsim. Kev ncaj ncees ntawm tag nrho cov feem nyob ntawm qhov kev xaiv kom raug ntawm cov neeg siv tau.
3. Dab tsi yog "kev tawg txias" thiab vim li cas P91 ua rau nws?
Txias tawg, lossis hydrogen -}}}}}}}}}}}}}}}} econded ntawm qhov kub nyob ze ambient tom qab vuam ua tiav. P91 yog qhov raug yog vim nws cov siab tawv, uas ua rau ib qho nyuaj, brittic martensitic qauv hauv lub haz. Yog tias hydrogen yog qhia los ntawm noo noo los noo, nws muaj peev xwm diffuse thiab khaws tau nyob rau hauv cov kev ntxhov siab no, cov cheeb tsam nkig. Qhov kev sib xyaw ua ke ntawm kev ntxhov siab, muaj kev cuam tshuam microstructure, thiab hydrogen ua rau micro - cov kab nrib pleb uas tuaj yeem nthuav tawm. Nruj nroo preheating thiab qis {- hydrogen xyaum yog qhov kev tiv thaiv feem ntau tiv thaiv qhov kev phom sij no.
4. Dab tsi yog qhov tshwm sim ntawm tsis raug PWHT ntawm P91 Weld?
Tsis yog pwht, txawm hais tias nyob rau hauv kub lossis sijhawm, tuaj yeem muaj kev rau txim loj heev. Yog hais tias lub pwht kub dhau lawm lossis lub sijhawm luv heev, lub taub dag zog dhau lawm, lub taub hau nyob twj ywm heev thiab nkig, ua rau muaj kev pheej hmoo ntawm kev tawg hauv kev pabcuam. Yog hais tias lub pwht kub dhau lawm, nws tuaj yeem ua rau muaj kev muag khoom ntau dhau thiab dhau}}}} tempent, ua rau muaj lub zog tseem ceeb thiab creep resistance. Cov xwm txheej ob qho tib si tsim qhov txuas tsis muaj zog hauv cov kab ke, muaj peev xwm ua rau muaj kev puas tsuaj rau kev ua tsis tiav thiab kub.
5. Dab tsi yog lub hom phiaj ntawm preheating ua ntej vuam p91?
Preheat ua haujlwm ntau cov hom phiaj tseem ceeb rau vuam p91. Firstly, nws ua rau lub txias txias tom qab vuam, uas pab txo qhov nyuaj ntawm lub martensite tsim nyob rau hauv lub martensite tsim nyob rau hauv lub Harensite tsim nyob rau hauv lub Haz, ua rau nws tsawg dua nkig. Thib ob, nws tso cai rau hydrogen kom diffuse ntawm lub weld cheeb tsam muaj kev pheej hmoo ntawm hydrogen nrib pleb. Nws kuj tseem pab kom txo cov thermal gradient ntawm weld thiab cov hlau ntoo, txo cov kev ntxhov siab shrinkage. Thaum kawg, tsim nyog preheating yog ib qib tseem ceeb los xyuas kom meej lub suab thiab tawg}} weld pub dawb.
