Lo lus nug 1: Dab tsi yog qhov kev sib tw yuav muaj teeb meem ntawm Astm A335 P11 Yeeb Nkab?
Thawj qhov nyuaj hauv vuam Attm ATTM A335 P11 Cov Yeeb Nkab Tshaj (Tshwj Xeeb Chromium), uas tuaj yeem ua rau weld cracking thiab cov teeb meem tawv. Vim tias P11 yog qhov qis {- alloy ultrasonic (feem ntau}}}}}} {}- qhov ua rau tawg. Tsis tas li ntawd, tom qab weld kev kho cua sov (duab) yuav tsum muaj, txwv tsis pub cov Weld cheeb tsam yuav swb vim muaj kev ntxhov siab. Kev xaiv ntawm vuam consumables tseem ceeb heev; Matching electrodes (xws li E8018-B2) feem ntau pom zoo. Thaum kawg, cua txias heev thaum lub sij hawm vuam yuav tsum zam, vim qhov no tuaj yeem ua rau tsim ntawm lub ntsej muag me me martensitic.
Lo lus nug 2: Yuav ua li cas vuam muaj kev pom zoo rau vuam astm A335 P11 Yeeb Nkab? Feem ntau siv vuam consumables nrog AWS E8018 {Electrodes (rau kev tuav tswv cuab (rau kev tuav tswv yim), thiab F8P12 flux (rau submerged arc vuam). Lub alloy muaj pes tsawg leeg ntawm cov neeg siv tau sib xws nrog cov yeeb nkab P11 tau sib haum, ua kom muaj kev vam meej weld cov khoom siv thiab siab {17} kub tsis kam. Ua ntej vuam, cov electrodes yuav tsum tau qhuav (feem ntau ntawm 300-350℃rau ib teev) kom txo cov ntsiab lus hydrogen. Rau cov qauv tseem ceeb, cov txheej txheem vuam tsim nyog (WPS / PITR). Tsis tas li ntawd, tom qab weld tsis nco qab kev soj ntsuam (xws li RT lossis UT) yuav tsum muaj qhov zoo weld zoo.
Lo lus nug 3: Dab tsi yog cov txiaj ntsig ntawm post - Weld Kev Kho Mob Kub (PWT) ntawm A335 P11 Yeeb Nkab?
Cov haujlwm tseem ceeb ntawm PWHT yog los daws Weld residual kev ntxhov siab thiab txhim kho weld nruj thiab tawg tsis kam. Rau cov yeeb nkab p11 steel, cov neeg raug kub yog 675- 760℃suav raws phab ntsa tuab (ib teev ib teev ib teev ib nti). Pwht kuj tseem txo qhov nyuaj ntawm Weld cheeb tsam mus rau qhov ntau (feem ntau HB tsawg dua lossis sib npaug ntawm 225). Unpwhted welds yuav raug kev txom nyem los ntawm kev ntxhov siab corrosion cracking (SCC) thaum kev pabcuam kub-kub. Pwhlt kuj txhim kho cov khoom siv cov neeg nkag, txuas ntxiv cov yeeb nkab cov kev pabcuam lub neej.
Lo lus nug 4: Kev tawg tawm tuaj yeem tiv thaiv thaum lub vuam ntawm ASTM A335 P11 yeeb nkab hlau?
Qhov tseem ceeb ntsuas kom tiv thaiv kev tawg txias suav nrog kev tswj hwm qhov kub me (200}} Khib) thiab cuam tshuam qhov ntsuas kub (tsawg dua lossis sib npaug). Tsawg - hydrogen hydrogen welding consumables (xws li E8018- b2) yuav tsum tau muab kom huv huv (tuav ntawm 300-350℃rau ib teev). Lub dehydrogen kho yuav tsum tau ua tam sim ntawd tom qab vuam (piv txwv li, tuav ntawm 250-300℃rau ob teev). Tsis tas li ntawd, tsis txhob vuam hauv noo lossis qis-kub ib puag ncig kom txo hydrogen intrusion. Thaum kawg, tom qab Weld Kev Kho Cua sov (duab) yog qhov tseem ceeb rau kev tiv thaiv kev tawg txias.
Lo lus nug 5: Yuav ua li cas thiaj kuaj tau zoo tom qab vuam astm A335 P11 yeeb nkab steel?
Tom qab vuam, kev kuaj xyuas kev kuaj xyuas (vt) yog thawj zaug ua los tshawb pom cov nplaim hluav taws xob tsis xws luag (xws li undercuts thiab pores). Nondestructive testioning (NDT), xws li ntsuas hluav taws xob (RT) lossis ultrasonic kuaj (ut), yog tom qab ntawd ua los xyuas cov kev tsis xws luag. Kev kuaj Hardness (xws li Brinell hardness HB) yog siv los xyuas kom meej tias lub hardness ntawm weld thiab tshav kub} kev cuam tshuam los ntawm cov qauv (feem ntau HB tsawg dua lossis sib npaug rau 225). MeballGraphic tsom xam tuaj yeem ua los ntsuas microstructure yog tias tsim nyog. Thaum kawg, kuaj xyuas lub siab (xws li dej lossis cua siab sim) qhia txog qhov nruj tag nrho thiab lub zog ntawm Weld.
