Vuam thiab kev soj ntsuam kev soj ntsuam ntawm cov kav dej anticorrosive
Weldability thiab kev ntsuam xyuas
1. Vuam: los ntawm cua sov los yog pressurizing, ntxiv los yog tsis ntxiv cov ntaub ntawv muab tub lim, thiaj li hais tias ob yam khoom interatomic ua ke los ua ib tug indivisible tag nrho cov txheej txheem.
2. Weldability: Nws yog hais txog lub peev xwm ntawm homogenous cov ntaub ntawv los yog cov ntaub ntawv heterogeneous los tsim ib qho kev sib koom ua tiav thiab ua tau raws li qhov xav tau ntawm kev siv raws li cov txheej txheem tsim khoom.
3. Plaub yam tseem ceeb cuam tshuam rau weldability yog: cov khoom siv, tsim, txheej txheem thiab kev pabcuam ib puag ncig.
4. Lub hauv paus ntsiab lus ntawm kev ntsuam xyuas weldability feem ntau suav nrog: (1) ntsuas qhov nyiam ntawm kev sib koom ua ke los tsim cov txheej txheem tsis xws luag, muab lub hauv paus rau kev txhim kho cov cuab yeej vuam tsim nyog; (2) Ntsuam xyuas seb qhov sib txuas welded puas tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm kev ua haujlwm; Kev tsim qauv ntawm txoj kev ntsuas vuam tshiab ua raws li cov hauv qab no: kev sib piv, kev sib raug zoo, kev tsim tawm thiab kev lag luam.
5. Carbon sib npaug: Cov ntsiab lus ntawm cov ntsiab lus alloying nyob rau hauv steel yog hloov dua siab tshiab thiab superimposed raws li qhov sib npaug ntawm ob peb cov ntsiab lus carbon, uas yog siv los ua ib qho kev ntsuas ntsuas rau roughly ntsuas qhov txias tawg nyiam ntawm steel.
6. Oblique Y-groove pob tw tawg kev sim: Lub hom phiaj yog siv los txheeb xyuas qhov vuam thiab HAZ nyiam ntawm thawj txheej ntawm cov hlau tsis tshua muaj hlau thiab lub zog siab steel los ua cov kab nrib pleb, thiab tseem tuaj yeem siv rau kev kos cov txheej txheem vuam. 1) Kev npaj cov qauv, welded steel phaj thickness δ=9-38 hli. Lub taub qab sib koom ua ke yog ua tiav los ntawm kev siv tshuab, thiab ob qho kawg ntawm cov phaj xeem yog welded nrog cov hlua khi tsis pub dhau 60 hli, thiab ob tog welding yog saws. Ua tib zoo saib xyuas kom tsis txhob lub kaum sab xis deformation thiab underpenetration. Xyuas kom meej tias muaj qhov sib txawv ntawm 2 hli hauv qhov sib txuas ntawm cov qauv nruab nrab yuav tsum tau welded. 2) Kev ntsuas kev ntsuas: vuam electrode xaiv rau qhov ntsuas vuam yog sib txuam nrog cov khoom siv hauv paus, cov electrode yuav tsum nruj nruj, txoj kab uas hla ntawm electrode yog 4 hli, vuam tam sim no yog (170 ± 10) A, vuam voltage yog (24 ± 2) V, vuam ceev yog (150 ± 10) mm / min. Kev ntsuas qhov vuam tuaj yeem txuas tau ntawm ntau qhov sib txawv ntawm qhov sib txawv, qhov ntsuas vuam tsuas yog welded, tsis txhob sau qhov zawj. Tom qab zoo li qub thiab ntuj txias rau 24h, cov qauv raug cuam tshuam rau kev tshawb pom tawg. 3) Tshawb nrhiav thiab suav cov kab nrib pleb. Tshawb xyuas cov kab nrib pleb ntawm qhov chaw thiab ntu ntawm qhov chaw vuam thiab cov cua sov cuam tshuam nrog qhov muag liab qab lossis nrog lub iav tsom iav ntawm tes ntawm 5-10 zaug. Nws feem ntau ntseeg tau tias thaum qhov tawg ntawm cov hlau tsis tshua muaj qis dua 20 feem pua hauv qhov kev sim "me me hlau sib tsoo", feem ntau tsis muaj qhov tawg.
7. Pin test: Lub hom phiaj yog los ntsuas cov hydrogen induced ncua kev sib tsoo ntawm cov hlau. Nrog rau lwm yam khoom siv, reheat crack rhiab heev thiab laminar rhiab heev kuj yuav ntsuas. 1) Kev npaj cov qauv, yuav tsum tau welded steel ua los yog cylindrical latch xeem pas nrig, raws li dov kev taw qhia sampling thiab qhia qhov chaw ntawm lub latch nyob rau hauv lub thickness kev taw qhia. Muaj ib lub nplhaib los yog ntsia hlau ntswj nyob ze ntawm qhov kawg ntawm qhov ntsuas pas ntsuas. Ntxig lub latch xeem pas nrig rau hauv lub qhov sib thooj hauv qab phaj kom qhov kawg ntawm qhov kawg yog ntws nrog rau saum npoo ntawm lub phaj hauv qab. Rau tus pin xeem pas nrig ntawm lub annular notch, qhov kev ncua deb ntawm qhov kev txiav txim siab thiab lub ntsej muag kawg yuav tsum ua kom qhov tob tob ntawm qhov vuam thiab lub dav hlau txiav ntawm lub hauv paus tangent los yog kev sib tshuam, tab sis ib feem ntawm lub voj voog ntawm cov hauv paus hniav. uas melted los ntawm yuav tsum tsis pub tshaj 20 feem pua.