1. Cov khoom siv sib xws thiab kev xaiv qib
Austenitic stainless hlau (piv txwv li, 304, 316L) yog qhov sib xws nrog Monel 400. Ferritic thiab martensitic stainless hlau muaj cov ntsiab lus ntawm cov pa roj carbon ntau dua thiab muaj zog dua, ua rau muaj kev tawg ntau dua thiab ua rau cov khoom siv tsis zoo tag nrho, yog li lawv tsis tshua siv rau kev sib txuas ncaj qha nrog Monel 400.
Qhov kev pheej hmoo tseem ceeb yog los ntawm kev sib xyaw ntawm nickel-tooj liab thiab hlau-chromium-nickel systems. Kev siv ntau dhau ntawm cov hlau los ntawm cov hlau tsis muaj steel rau hauv cov hlau vuam yuav ua rau cov theem sib txuas sib txuas thiab ua kom kub tawg.
2. Filler Hlau Xaiv
Lub hauv paus ntsiab lus tseem ceeb yog xaiv cov nickel-raws li vuam consumables nrog siab kam rau dilution thiab zoo heev tawg kuj, es tsis txhob stainless hlau fillers los yog Monel 400 txuam fillers.
Pom zoo muab tub lim hlau:
AWS A5.14 ERNiCu‑7 (zoo ib yam li Monel 400) tuaj yeem siv rau cov phaj nyias thiab cov pob qij txha qis, tab sis nws txoj kev kam rau cov hlau dilution yog txwv.
AWS A5.11 ENiCrFe-3 (Inconel 82 filler) yog qhov pom zoo tshaj plaws. Nws muaj cov ntsiab lus siab chromium thiab hlau, muaj zog tiv thaiv kub tawg thiab intergranular corrosion, thiab tuaj yeem ua kom haum siab dilution los ntawm stainless hlau thaum tuav zoo ductility thiab corrosion kuj.
ENiCrMo-3 (Hastelloy C-276 hom) yog siv rau qhov chaw tiv thaiv corrosion huab cua, muab qhov zoo tshaj plaws ntawm tag nrho thiab hauv cheeb tsam corrosion kuj.
3. Vuam txoj kev thiab txheej txheem tsis
Feem ntau siv cov txheej txheem:TIG (GTAW), MIG (GMAW), and SMAW (shielded metal arc welding). TIG welding yog qhov zoo dua rau cov hauv paus hla thiab cov pob qij txha precision vim nws qhov ruaj khov arc thiab cov cua kub qis.
Kev tswj cov cua sov: Txais cov cua kub qis thiab cov vuam ceev kom luv lub sij hawm nyob rau hauv high-temperature, txo lub sij hawm diffusion, suppress intermetallic nag lossis daus, thiab txo qhov vuam distortion thiab grain loj hlob.
Preheating thiab interpass kub: Monel 400 muaj thermal conductivity thiab tsawg coefficient ntawm thermal expansion piv rau stainless hlau. Feem ntau, preheating tsis tas yuav tsum tau rau cov phaj nyias. Rau cov phaj tuab lossis qhov kub thiab txias, preheat rau 65-150℃nkaus xwb, thiab nruj me ntsis tswj lub interpass kub hauv qab 150℃kom tsis txhob kub tawg.
Kev tiv thaiv roj: Rau TIG / MIG welding, siv high-purity argon (99.99% min) ua cov roj thaiv thiab cov roj rov qab. Kev tiv thaiv rov qab yog qhov tseem ceeb los tiv thaiv oxidation, porosity thiab npib tsib xee poob hauv cov hauv paus hniav, uas yuav ua rau kev ua haujlwm corrosion.
4. Kev ua haujlwm vuam thiab kev kho tom qab vuam
Txo tus nqi dilution:Tswj lub vuam hlaws zoo kom dav thiab ntiav, tsis txhob nkag mus tob, thiab txwv qhov sib xyaw ntawm cov hlau hauv paus. Cov hlau dilution ntau dhau yuav txo qhov ductility thiab corrosion kuj ntawm cov vuam.
Qhov yuav tsum tau ua kom huv: Tshem cov roj, roj, oxide nplai, noo noo thiab pleev xim los ntawm qhov chaw vuam tsis pub dhau 20 hli ntawm qhov zawj. Cov kab mob uas muaj leej faj, phosphorus, txhuas thiab zinc tuaj yeem ua rau kub kub tawg thiab porosity.
Kev kho cua sov tom qab (PWHT): Feem ntau tsis pom zoo rau qhov sib txawv ntawm Monel 400 thiab austenitic stainless hlau. PWHT tuaj yeem txhawb nqa nag lossis daus ntawm theem nkig thiab ua rau muaj kev ntxhov siab ntxiv, thiab tsis tuaj yeem txhim kho kev sib koom ua haujlwm zoo. Kev ntxhov siab tsis tas yuav tsum muaj rau feem ntau cov kev pabcuam.
Galvanic corrosion xav txog:Tom qab vuam, qhov sib txawv ntawm Monel 400 thiab stainless hlau yuav ua rau galvanic corrosion nyob rau hauv conductive electrolytes. Kev ntsuas xws li kev sib cais ntawm cov txheej txheem, ua kom cov cheeb tsam cathode piv, lossis siv cov khoom siv hluav taws xob yuav tsum tau txiav txim siab hauv kev tsim qauv.
