Hauv cov yeeb nkab ntawm cov yeeb nkab raug, ntau yam qauv thiab cov kev qhia tshwj xeeb yuav tsum tau ua raws li kom ntseeg tau qhov zoo thiab kev nyab xeeb ntawm cov khoom kawg.ASTM A139yog ib tus qauv uas ua lub luag haujlwm tseem ceeb hauv kev tsim cov kav hlau tsim rau ntau yam kev siv.
ASTM A139 yog tus qauv txheej txheem rau kev siv hluav taws xob (arc) welded steel yeeb nkab (nps 4 thiab siab dua). Nws npog cov cai kom muab kauv electrofusion (arc) welded, yuag Cov txheej txheem no tau qhia txog cov kev cai rau cov ntaub ntawv, kev tsim khoom, qhov ntev thiab cov khoom siv kho txhua yam ntawm cov kav hlau.
Cov ntaub ntawv uas tseev kom muaj ntawm Astm A139 qhia meej hom thiab qib ntawm cov hlau uas tuaj yeem siv los ua cov kav dej. Qhov no suav nrog cov tshuaj lom neeg muaj pes tsawg leeg ntawm cov hlau, uas yuav tsum muaj feem ntau feem ntau ntawm cov pa roj carbon, manganese, phosphorus, sulfur thiab silicon. Cov kev xav tau no yog qhov tseem ceeb los txhawm rau txhawm rau paub tias cov hlau siv hauvlub xov khoomtau raws li qhov tsim nyog muaj zog thiab corrosion tiv taus cov qauv.
Kev tsim khoom lag luam rau ASTM A139 cov yeeb nkab cuam tshuam hluav taws xob (arc) vuam, uas siv hluav taws xob tsim kom muaj cov cua sov uas xav tau rau hauv cov hlau rau hauv ib lub cylindrical puab. Cov txheej txheem no yog ua tib zoo tswj kom ntseeg tau tias cov welds yog cov khoom lag luam zoo thiab pub dawb. Tus qauv kuj tseem piav qhia txog txoj kev tshuaj xyuas rau Welds, xws li ultrasonic sim thiab transversely guedided bend kuaj, kom lawv ua tau raws li cov qauv kev xav tau.
Nyob rau hauv cov nqe lus ntawm qhov ntev, astm A139 cov ntsiab lus sau rau cov yeeb nkab loj, phab ntsa tuab, thiab ntev. Qhov no suav nrog kev siv nyiaj rau ntawm qhov ntev kom ntseeg tau tias cov yeeb nkab ua tau raws li cov kev siv tsim nyog. Cov qauv no yuav tsum tseem ceeb heev rau kev ua kom cov kav dej tau nruab thiab txuas nrog rau ntau yam kev siv.
Cov cuab yeej kho tshuab xws li lub zog tensile, tawm los ntawm kev sib tw, thiab elongation kuj tau sau tseg hauv Astm A139. Cov khoom no yog qhov tseem ceeb hauv kev txiav txim siab lub zog thiab kev ua tau zoo ntawm cov yeeb nkab hauv qab ntau txoj haujlwm. Cov qauv teeb meem yam tsawg kawg nkaus uas yuav tsum muaj rau cov neeg kho mob cov khoom siv kom ntseeg tau tias cov yeeb nkab tuaj yeem tiv thaiv qhov kev xav tau siab, qhov kev kub ntxhov thiab ib puag ncig.
Zuag qhia tag nrho, Astm A139 ua lub luag haujlwm tseem ceeb hauv kev tsim khoom ntawmHlau Kav HlauRau ntau cov ntawv thov. Los ntawm kev qhia cov ntaub ntawv, cov txheej txheem tsim khoom, qhov loj me thiab cov khoom siv tshuab ua kom ntseeg tau tias cov qauv khoom kawg tau raws li cov qauv kev nyab xeeb thiab kev nyab xeeb. Nws muab cov tuam ntxhab, engineers thiab xaus cov neeg siv kev ntseeg siab tias cov yeeb nkab yuav ua raws li qhov xav tau nyob rau hauv nws cov ntawv thov.
Hauv cov ntsiab lus, nkag siab qhov tseem ceeb ntawm ANTM A139 hauv cov yeeb nkab tsim yog qhov tseem ceeb rau kev ua kom zoo thiab kev nyab xeeb ntawm cov khoom siv hlau. Cov qauv teeb tsa cov ntaub ntawv tsim nyog, cov txheej txheem tsim chaw, qhov ntev thiab cov kws kho mob kom ntseeg tau tias cov kav dej ua tau zoo thiab ua tau zoo. Los ntawm adherm A139, cov chaw tsim khoom tuaj yeem tsim cov yeeb nkab zoo ntawm cov hlau ua kom tau zoo ntawm ntau yam kev lag luam thiab kev siv.
Lub Sijhawm Post: Dec-28-2023