1. Vim li cas ASTM A312 Qib 316L welded yeeb nkab yog tsim nyog rau marine thiab tshuaj ib puag ncig dua qib 304?Teb: ASTM A312 Qib 316L welded yeeb nkab yog tsim nyog rau marine thiab tshuaj ib puag ncig dua qib 304 vim nws muaj molybdenum (Mo: 2.00-3.00%), uas ua rau nws cov corrosion kuj, tshwj xeeb tshaj yog tiv thaiv pitting corrosion thiab crevice corrosion tshwm sim los ntawm cov tshuaj chloride ions (Cl⁻) thiab chloride media. Tsis tas li ntawd, Qib 316L muaj cov ntsiab lus qis dua (C: 0.03% max) dua li Qib 304 (0.08% max), uas ntxiv txo qhov kev pheej hmoo ntawm intergranular corrosion tom qab vuam lossis kev kho cua sov. Marine ib puag ncig yog nplua nuj nyob rau hauv chloride ions, thiab tshuaj lom neeg ib puag ncig feem ntau muaj acidic, alkaline, los yog ntsev-muaj xov xwm; Qib 316L cov ntsiab lus molybdenum thiab cov pa roj carbon tsawg ua rau nws tiv taus ntau dua rau cov corrosive yam, ua kom lub neej ua haujlwm ntev dua piv rau Qib 304.
2. Txoj kev vuam dab tsi tau pom zoo rau EN 10216-5 Qib 1.4301 (304) welded kav, thiab yuav tsum tau ceev faj dab tsi kom tsis txhob muaj qhov tsis xws luag?Teb: Cov txheej txheem vuam pom zoo rau EN 10216-5 Qib 1.4301 (sib npaug rau ASTM 304) welded kav yog roj tungsten arc vuam (GTAW/TIG) thiab roj hlau arc vuam (GMAW/MIG). GTAW yog tsim rau nyias- cov kav dej thiab cov hauv paus welding, raws li nws muab cov kev tswj xyuas ntawm cov vuam seam, siab vuam zoo, thiab tsawg heev spatter. GMAW yog tsim rau tuab- cov kav dej uas muaj phab ntsa thiab siab - vuam zoo. Kev ceev faj kom tsis txhob muaj qhov tsis xws li vuam muaj xws li: 1) Kev siv cov vuam hlau thiab cov electrodes txuam nrog lub hauv paus hlau (xws li ER308 rau GTAW, ER308L rau qis- cov pa roj carbon cov ntsiab lus). 2) Ua ntej- ntxuav lub vuam cheeb tsam kom tshem tawm cov roj, xeb, thiab 15 oxide poclity scale,{100% 0. Kev tswj cov vuam tam sim no thiab qhov hluav taws xob kom tsis txhob muaj cua sov, uas tuaj yeem ua rau cov qoob loo loj hlob thiab txo cov tawv nqaij. 4) Siv cov roj thaiv kev tsim nyog (argon lossis argon-oxygen sib tov) los tiv thaiv lub pas dej welding thiab tiv thaiv oxidation . 5) Tsis txhob ua kom txias sai tom qab vuam kom txo tau cov kab mob khaub thuas.
3. Dab tsi yog qhov txawv ntawm ASTM A312 Qib 304 thiab 304L welded kav nyob rau hauv cov ntsiab lus ntawm carbon cov ntsiab lus thiab daim ntawv thov scenarios?Teb: Qhov sib txawv tseem ceeb ntawm ASTM A312 Qib 304 thiab 304L welded kav yog lawv cov ntsiab lus carbon: Qib 304 muaj cov ntsiab lus siab tshaj plaws ntawm 0.08%, thaum Qib 304L muaj cov ntsiab lus siab tshaj plaws ntawm 0.03% ("L" sawv rau "tsawg carbon"). Qhov sib txawv no cuam tshuam rau lawv tsis kam mus rau intergranular corrosion. Qib 304L yog qhov tiv taus ntau dua rau kev sib xyaw ua ke vim tias cov ntsiab lus carbon tsawg tiv thaiv cov nag lossis daus ntawm chromium carbides ntawm cov ciam teb thaum lub sij hawm vuam los yog kev kho cua sov (uas yuav deplete chromium ze ntawm cov ciam teb nplej thiab txo cov corrosion kuj). Daim ntawv thov scenarios: Qib 304 yog qhov tsim nyog rau kev xeb dav dav- cov cheeb tsam tiv taus, xws li kev ua zaub mov, kev kho dej, thiab kho vaj tse. Qib 304L yog qhov tsim nyog rau cov ntawv thov uas yuav tsum muaj kev tiv thaiv corrosion siab, xws li cov khoom siv tshuaj lom neeg, kev lag luam hauv hiav txwv, thiab cov kav dej thauj cov xov xwm corrosive, tshwj xeeb tshaj yog thaum cov yeeb nkab raug vuam lossis kev kho cua sov.
4. Cov txheej txheem kho cua sov ua li cas cuam tshuam rau cov khoom siv kho tshuab thiab corrosion kuj ntawm ASTM A312 Qib 316 welded kav?Teb: Cov txheej txheem kev kho cua sov (tsuas yog cov tshuaj annealing) muaj qhov cuam tshuam loj rau cov khoom siv kho tshuab thiab corrosion kuj ntawm ASTM A312 Qib 316 welded kav. Kev daws annealing feem ntau yog ua tiav ntawm 1010-1150 degree, ua raws li kev txias sai (dej quenching). Cov txheej txheem no ua tiav ob qho txiaj ntsig tseem ceeb: 1) Cov khoom siv kho tshuab: nws tshem tawm cov kev ntxhov siab ntawm cov welding residual, refines lub grain qauv, thiab txhim kho cov yeeb nkab lub toughness thiab ductility. Yog tias tsis muaj tshuaj annealing, weld seam yuav muaj kev ntxhov siab ntau ntxiv, ua rau brittleness thiab txo cov kabmob muaj peev xwm . 2) Corrosion resistance: nws dissolves cov chromium carbides uas tej zaum yuav tau precipitated thaum lub vuam, rov ua kom cov khoom sib faib ntawm chromium hauv cov qauv austenitic, yog li txhim kho cov kav dej corrosion thiab kev cuam tshuam. Yog tias kev kho cua sov tsis tsim nyog (xws li tsis txaus annealing kub lossis txias txias), qhov kev tiv thaiv corrosion thiab txhua yam khoom ntawm cov yeeb nkab yuav txo qis.
5. Dab tsi yog qhov tseem ceeb ntawm kev ua haujlwm ntawm JIS G3448 SUS304 welded kav rau cov khoom siv ua zaub mov, thiab yuav ua li cas kom ntseeg tau tias lawv ua tau raws li cov cai no?Teb: JIS G3448 SUS304 welded kav siv rau cov khoom ua zaub mov yuav tsum ua raws li cov hauv qab no kev ua tau zoo: 1) Corrosion resistance: yuav tsum tiv taus cov zaub mov acids (xws li citric acid, acetic acid), ntsev, thiab cov tshuaj ntxuav, tsis muaj xeb lossis tso tawm cov khoom tsis zoo . 2) Kev huv huv: cov kab mob dawb huv yuav tsum tau ua kom huv, yooj yim ntawm cov kab mob. kev loj hlob. 3) Cov khoom siv kho tshuab: muaj zog txaus thiab ductility los tiv thaiv lub siab ntawm kev ua zaub mov (xws li dej filling) thiab kev teeb tsa. 4) Ua raws li cov qauv kev nyab xeeb khoom noj (xws li FDA, GB 4806). Txhawm rau kom ntseeg tau tias cov kev cai no tau ua tiav: 1) nruj me ntsis tswj cov tshuaj muaj pes tsawg leeg ntawm cov yeeb nkab kom ntseeg tau tias nws ua tau raws li SUS304 cov qauv (Cr: 18.0-20.0%, Ni: 8.0-12.0%, C Tsawg dua lossis sib npaug li 0.08%). 2) Siv GTAW vuam rau sab hauv weld seam 1 burrs thiab ua kom muaj kev sib haum xeeb txhawm rau txhim kho kev tiv thaiv corrosion{15}}) Ua qhov kev kho saum npoo (xws li pickling thiab passivation) txhawm rau txhim kho qhov chaw tiav thiab kev tiv thaiv corrosion. 5) Kev tshuaj xyuas nruj, suav nrog kev kuaj corrosion, tshuaj xyuas qhov zoo, thiab kuaj kev huv.
