1. Lo lus nug: Cov phab ntsa tuab ntawm cov yeeb nkab welded ua li cas rau qhov tsim nyog preheating thiab tom qab- cov txheej txheem cua sov rau cov khoom siv Q390?
Teb: Rau Q390, phab ntsa thickness plays lub luag haujlwm tseem ceeb hauv kev txiav txim siab xav tau preheating. Rau nyias- cov kav dej (piv txwv li, qis dua 15mm), preheating feem ntau tsis tsim nyog vim yog qhov ceev, zoo li cua txias thiab qis qis. Txawm li cas los xij, rau tuab -cov kav dej Q390 (piv txwv li, tshaj 25-30mm), ntu tuab ua raws li lub dab dej kub loj, ua rau cov vuam txias sai heev. Qhov kev ua kom txias sai sai no tuaj yeem tsim cov txheej txheem nyuaj, txawm tias hauv Q390. Nyob rau hauv xws li mob, ib tug nruab nrab preheat ntawm 50-100℃yog siv rau qeeb tus nqi cua txias. Tom qab cua sov (tso qhov kub thiab txias tom qab vuam) kuj tseem siv tau los tso cai rau hydrogen diffuse tawm.
2. Lo lus nug: Dab tsi yog qhov laj thawj tseem ceeb ntawm kev siv "txhuas (Al) tua" steel hauv kev tsim cov kav dej Q460 welded?
Teb: "Tua" steel nrog txhuas yog txheej txheem deoxidation. Aluminium yog lub zog deoxidizer uas ua rau cov pa oxygen los tsim cov txhuas oxide (Al2O3), uas ntab tawm ntawm cov hlau molten, tshem tawm cov pa oxygen. Qhov laj thawj tseem ceeb rau qhov no hauv Q460 yog los tiv thaiv kev tsim cov pa roj carbon monoxide (CO) porosity thaum lub sij hawm solidification. Tshaj li deoxidation, txhuas kuj tsim cov nitrides zoo (AlN) uas pab ua kom cov austenite grain loj. Qhov kev ua kom zoo ntawm cov nplej no yog qhov tseem ceeb rau Q460 kom ua tiav nws qhov yuav tsum tau muaj lub zog siab thiab, qhov tseem ceeb tshaj, nws qhov zoo heev qis - qhov kub thiab txias cuam tshuam, tshwj xeeb tshaj yog rau qib C, D, thiab E zoo.
3. Lo lus nug: Nyob rau hauv ib qho loj -tej kev tsim kho qhov project siv Q390D welded kav, lub hom phiaj ntawm kev ua "welding txheej txheem tsim nyog" (WPQ) yog dab tsi ua ntej qhov tseeb welding pib?
Teb: Kev Tsim Nyog Kev Tsim Nyog Vuam (WPQ) yog qhov yuav tsum tau ua pov thawj tias cov txheej txheem vuam txheej txheem tuaj yeem tsim lub suab, qhov tsis xws luag - weld dawb nrog cov khoom siv kho tshuab. Rau Q390D cov kav dej, ib daim ntawv xeem yog welded siv qhov tsis muaj tseeb (preheat, cua sov input, muab tub lim, thiab lwm yam) uas yuav siv rau hauv lub tshav pob. Cov ntawv xeem no yog tom qab ntawd raug rau cov kev sim ua kom puas: tensile, khoov, thiab kev ntsuam xyuas cuam tshuam (ntawm -20℃rau qib 'D'). WPQ txheeb xyuas tias qhov kev xaiv ntawm cov khoom siv thiab cov chaw teeb tsa muaj peev xwm tsim tau cov vuam uas ua tau raws li cov cai yuav tsum ua ua ntej yuav muaj qhov sib txawv ntawm qhov tseeb vuam.
4. Nqe Lus Nug: Yuav ua li cas cov ntawv thov raug rau Q420 welded kav sib txawv ntawm Q390 nyob rau hauv cov ntsiab lus ntawm siab -kua kua kis tau tus mob?
Teb: Ob leeg tuaj yeem siv tau rau kev xa dej, tab sis Q420 muaj lub zog ntau dua - rau - qhov hnyav piv. Rau qhov muab lub siab sab hauv, cov yeeb nkab ua los ntawm Q420 tuaj yeem muaj phab ntsa nyias dua li Q390 yeeb nkab. Qhov no ua rau Q420 yog qhov kev xaiv zoo tshaj plaws rau qhov ntev -cov kav dej thiab cov roj av uas txo qhov hnyav ntawm cov hlau txhais tau tias txuag nyiaj ntau hauv cov khoom siv thiab cov nqi thauj mus los. Q390 tej zaum yuav raug xaiv rau qis dua - cov kab sib txuas siab lossis hauv cov xwm txheej uas cov saw hlau tau paub ntau dua nrog qib, thaum Q420 tau teev tseg rau siab dua - cov kab sib txuas tseem ceeb uas tus nqi - kev ua tau zoo los ntawm kev txo qhov hnyav yog qhov tseem ceeb.
5. Nqe Lus Nug: Raws li cov ntaub ntawv los ntawm National Standardization Committee, vim li cas qib Q345 thiaj li raug tshem tawm ntawm cov kav dej thauj cov qauv thiab hloov nrog Q355?
Teb: Pawg Neeg Saib Xyuas Kev Cai Hauv Tebchaws tau hloov kho cov qauv kom ua raws li cov qauv tshiab ntawm GB / T 1591 rau cov qauv hlau. Hauv xyoo 2018 hloov kho ntawm GB / T 1591, qib Q345 qub raug tshem tawm thiab hloov nrog Q355, uas tau hloov kho me ntsis tshuaj thiab cov cuab yeej cuab tam. Txhawm rau daws qhov tsis sib xws ntawm tus qauv seamless yeeb nkab (GB / T 8163) thiab cov khoom siv hauv paus, cov qauv yeeb nkab tau hloov kho. Qhov no txhais tau hais tias rau cov ntawv thov uas xav tau lub zog zoo ib yam li qub Q345, engineers thiab manufacturers tam sim no yuav tsum tau qhia Q355, thaum Q390, Q420, thiab Q460 tseem yog cov qib tom ntej ntawm ntau dua - cov ntaub ntawv muaj zog.
