Nrog rau txoj kev loj hlob ntawm kev lag luam xws li hlau thiab hlau, petrochemical kev lag luam, nkoj thiab hluav taws xob fais fab, cov welded qauv yuav tsim nyob rau hauv cov kev taw qhia ntawm loj-scale, loj-muaj peev xwm thiab high-tsis, thiab ib co tseem ua hauj lwm nyob rau hauv tsawg kub, cryogenic, corrosive media thiab lwm qhov chaw.
Yog li ntawd, ntau yam tsawg-alloy high-strength steels, nruab nrab- thiab high-alloy steels, super-lub zog steels, thiab ntau yam ntaub ntawv alloy yog nce.Txawm li cas los xij, nrog rau kev siv cov qib steel thiab alloys, muaj ntau yam teeb meem tshiab tau coj los rau hauv kev tsim cov vuam, cov uas muaj ntau dua thiab hnyav heev yog vuam tawg.
Kev tawg qee zaum tshwm sim thaum vuam thiab qee zaum thaum muab tso rau lossis ua haujlwm, thiaj li hu ua ncua kev tawg.Vim tias cov kab nrib pleb zoo li no tsis tuaj yeem tshawb pom hauv kev tsim khoom, cov kab nrib pleb zoo li no txaus ntshai dua.Muaj ntau hom kab nrib pleb tsim nyob rau hauv cov txheej txheem vuam.Raws li kev tshawb fawb tam sim no, raws li qhov tshwm sim ntawm cov kab nrib pleb, lawv tuaj yeem faib ua 5 pawg hauv qab no:
1. Kub tawg
Cov tawg kub yog tsim los ntawm qhov kub thiab txias thaum lub sij hawm vuam, yog li lawv hu ua kub tawg.Nyob ntawm seb cov khoom siv ntawm cov hlau yuav tsum tau welded, cov duab, qhov kub thiab txias thiab lub ntsiab yog vim li cas ntawm cov khoom kub kub generated kuj txawv.Yog li ntawd, cov kab tawg kub tau muab faib ua peb pawg: crystallization tawg, liquefaction tawg thiab polygonal tawg.
1. Crystal tawg
Nyob rau theem tom ntej ntawm crystallization, cov yeeb yaj kiab ua kua tsim los ntawm qhov ntim qis eutectic tsis muaj zog ntawm kev sib txuas ntawm cov nplej, thiab cov kab nrib pleb tshwm sim nyob rau hauv qhov kev txiav txim ntawm tensile stress.
Nws feem ntau tshwm sim nyob rau hauv cov welds ntawm carbon steel thiab low-alloy steel nrog ntau impurities (cov ntsiab lus siab ntawm leej faj, phosphorus, hlau, carbon, thiab silicon) thiab welds ntawm ib-theem austenitic steel, npib tsib xee-raws li alloys thiab ib co aluminium alloys. nruab nrab.Hauv ib tus neeg mob, cov kab nrib pleb crystalline kuj tuaj yeem tshwm sim hauv thaj chaw uas muaj kev kub ntxhov.
2. Kub kub liquefaction tawg
Nyob rau hauv qhov kev txiav txim ntawm lub ncov kub ntawm lub vuam thermal voj voog, remelting tshwm sim ntawm lub tshav kub-cuam tshuam cheeb tsam thiab cov khaubncaws sab nraud povtseg ntawm ntau txheej vuam, thiab cov kab nrib pleb yog generated nyob rau hauv qhov kev txiav txim ntawm kev ntxhov siab.
Nws feem ntau tshwm sim hauv cov hlau muaj zog uas muaj chromium thiab npib tsib xee, austenitic steels, thiab qee cov nickel-based alloys nyob ze seam cheeb tsam los yog nruab nrab ntawm ntau txheej welds.Thaum cov ntsiab lus ntawm leej faj, phosphorus thiab silicon carbon nyob rau hauv lub hauv paus hlau thiab vuam hlau yog siab, qhov nyiam ntawm liquefaction cracking yuav nce ho.
Lub sij hawm xa tuaj: Plaub Hlis-18-2022