Txij li thaum lub cev lub zog ntawm molybdenum thiab nws cov alloys sib txawv ntau ntawm cov ntawm stainless hlau, ntau yam teeb meem tshwm sim thaum lub sijhawm vuam. Hauv lawv cov soldering, thaum rhuab mus rau 400 ° C, me ntsis oxidation tshwm sim; thaum nws siab dua 600 ° C, nws yog sai oxidized rau MoO3 compound. Lub solubility ntawm oxygen hauv molybdenum yog me me. Thaum cov pa oxygen muaj ntau ntxiv, qhov tsim los ua oxide precipitates raws thaj tsam ntawm cov nplej, thiab qhov nkig ntawm lwm qhov tsis huv kuj tseem ua rau khov, ua rau lub vuam nyuaj.
Thaum molybdenum yog welded rau stainless hlau, lub siab hardness thiab siab brittleness cheeb tsam yog yuav tshwm sim ze ntawm cov hlau sab ntawm molybdenum puag khoom, thiab qhov dav ntawm feem ntau yog 0.5 mus rau 3 μm. Lub brittleness nyiam nyob ze ntawm cov hlau stainless sab yog me me. Cov paib tom qab hloov ceev yog qhov ceev, thiab cov qauv martensite tshwm ntawm cov hlau sab ntawm molybdenum puag hlau, uas ua rau cov embrittlement ntawm weld tshav kub cuam tshuam cheeb tsam thiab cheeb tsam sib koom ua ke. Raws li kev ua ntawm vuam kev nyuaj siab, qhov tawg ntawm qhov sib koom ua ke yuav raug hnyav ntxiv, yog li cov hlau tsis huv thiab Molybdenum muaj qhov tsis zoo weldability.
Cov dissimilar weld hlau ntawm hlaus tsis xeb hlau thiab molybdenum muaj peb ntu, thiab cov seam weld tau muab faib tsis ncaj. Nyob ze rau cov steel puag cov khoom siv sab yog ob-theem qauv tsim los ntawm cov hlau thiab cov khoom sib txig sib luag. Nws hardness nce siab tag. Sab ntawm lub tsev molybdenum yog khoom siv ob-theem tsim los ntawm cov kev sib txuas sib luag. Lub hardness kuj nce siab tag. Nws yog tsim ntawm cov kab sib txuas ua ke nruab nrab ntawm molybdenum thiab stainless hlau, thiab lub hardness kuj siab. Nov yog qhov chaw vuam ntawm molybdenum thiab stainless hlau tsis yooj yim.
Lub vuam ntawm cov hlau tsis xeb thiab molybdenum tuaj yeem ua los ntawm kev sib txuas ntawm argon arc vuam, hluav taws xob nqaj hlau vuam, roj viav vuam, thiab lwm yam, thiab ob qho tib si fusion vuam thiab txhaws cov pob qij txha tuaj yeem tau txais. Lub ntsiab lus ntawm cov txheej txheem welding no yog ua kom cov hlau puag cov khoom siv sab yaj ntau dua hlau, thaum lub pob zeb molybdenum lub hauv paus cov khoom tsuas yog qhov kub thiab tsis yaj lossis yaj ib qho me me, thiab cov hlau molten yog impregnated nrog cov kua hlau ntawm welded stainless hlau los ua daim ntawv brazed weld seam. Qhov no zam qhov tsim muaj qhov nyuaj thiab thim cov lus sib xyaw hauv cov pa roj carbon thiab molybdenum hauv cov hlau tsis xeb, uas daws cov teeb meem ntawm brittleness hauv thaj av sib koom ua ke.
Txhawm rau txhim kho qhov vuam kev ua haujlwm ntawm stainless hlau thiab molybdenum, ib qho kev hloov pauv nruab nrab kuj tseem siv tau. Txawm hais tias vuam cov txheej txheem muaj ntau cov nyom, nws txoj kev weldability tau zoo heev. Kev kho ntawm qhov chaw weldment ua ntej welding yog qhov tseem ceeb thiab cov txheej txheem welding yuav tsum muaj kev tswj hwm nruj.
