1. Dab tsi yog qhov cuam tshuam ntawm cov ntsiab lus carbon ntawm cov weldability ntawm S235JR welded kav (EN 10219 tus qauv), thiab yuav ua li cas los txhim kho lawv cov weldability yog tias tsim nyog?Teb: S235JR welded kav (EN 10219) muaj cov ntsiab lus carbon tsawg dua lossis sib npaug li 0.17%, uas yog qhov qis, yog li lawv cov weldability feem ntau zoo. Txawm li cas los xij, yog tias cov ntsiab lus carbon nyob ze rau qhov txwv sab saud lossis muaj lwm yam impurities (xws li phosphorus thiab sulfur) tshaj tus qauv, nws yuav ua rau muaj kev sib txuas ntxiv thiab muaj kev pheej hmoo siab dua ntawm cov kab nrib pleb. Txhawm rau txhim kho weldability, ntsuas tau xws li: 1) Kev tswj cov tshuaj muaj pes tsawg leeg nruj me ntsis, kom ntseeg tau tias cov pa roj carbon, phosphorus, thiab sulfur cov ntsiab lus nyob rau hauv cov txheej txheem ntau yam . 2) Preheating cov yeeb nkab ua ntej vuam (preheating kub feem ntau yog 80-150 degree) kom txo tau qhov kub thiab txias gradient ntawm lub hauv paus hlau . 2) welding seam. qis-hydrogen vuam electrodes lossis vuam hlau los txo cov ntsiab lus hydrogen hauv cov vuam seam, uas tuaj yeem tiv thaiv cov kab nrib pleb uas tshwm sim los ntawm hydrogen. 4) Tswj cov vuam tsis sib xws (xws li txo vuam tam sim no thiab nce vuam ceev) kom tsis txhob muaj cua sov ntawm cov vuam seam.
2. Dab tsi yog qhov kev txwv ntawm ASTM A53 Qib F welded kav, thiab nyob rau hauv cov xwm txheej twg lawv yuav tsum zam?Teb: ASTM A53 Qib F welded kav yog ua los ntawm seamless los yog welded carbon steel, nrog ib tug tsawg kawg nkaus tensile zog ntawm 414 MPa thiab yield zog ntawm 241 MPa. Lawv cov kev txwv tsis pub siv feem ntau yog vim lawv qhov tsis zoo corrosion kuj thiab siab -kub tsis kam. Lawv yuav tsum tau zam nyob rau hauv cov xwm txheej hauv qab no: 1) High - qhov kub thiab txias ib puag ncig (siab dua 370 degree), raws li lawv cov khoom siv tshuab yuav txo qis, ua rau deformation los yog tsis ua hauj lwm. 2) Corrosive ib puag ncig (xws li marine ib puag ncig, tshuaj nroj tsuag nrog acidic / alkaline xov xwm), vim hais tias cov uncoated Qib 10 cov kev pab cuam lub neej frosts} cov kav dej yog corrosion. Siab- cov ntawv thov siab (siab dua 10 MPa), vim tias lawv lub zog yuav tsis ua tau raws li cov kev xav tau ntawm kev thauj khoom, ua rau cov kav dej xau. 4) Cov ntawv thov uas xav tau siab precision thiab nto zoo, raws li Qib F cov kav dej muaj qhov tsis tshua muaj qhov tseeb thiab qhov chaw tiav.
3. Yuav ua li cas xaiv ntawm GB / T 3091 Q215A thiab Q235B welded kav rau qhov qis- qhov project dej siab, thiab dab tsi yog qhov tseem ceeb rau kev txiav txim siab?Teb: Thaum xaiv ntawm GB / T 3091 Q215A thiab Q235B welded kav rau qhov qis - qhov dej siab qhov project (siab dua los yog sib npaug rau 1.6 MPa), cov kev xav tseem ceeb yog cov khoom siv kho tshuab, nqi, thiab kev pabcuam ib puag ncig. Q215A muaj lub zog tensile yam tsawg kawg nkaus ntawm 335 MPa thiab tawm lub zog ntawm 215 MPa, thaum Q235B muaj lub zog siab dua (lub zog tensile Ntau dua lossis sib npaug rau 375 MPa, tawm lub zog ntau dua lossis sib npaug rau 235 MPa). Yog tias cov kav dej xa dej tau muab tso rau hauv ib puag ncig yooj yim (xws li saum toj no- hauv av, tsis muaj qhov hnyav sab nraud), Q215A tuaj yeem xaiv vim tias nws raug nqi ntau dua - siv tau. Yog tias cov raj xa dej tau muab tso rau hauv av, dais lub siab sab nraud (xws li av siab, lub tsheb thauj khoom), lossis muaj kev xav tau ntau dua rau kev ua haujlwm ntev, Q235B yog qhov tsim nyog dua vim nws lub zog ntau dua thiab zoo dua toughness. Tsis tas li ntawd, Q235B muaj qhov zoo dua weldability thiab cuam tshuam tsis kam, uas tuaj yeem txo qhov kev pheej hmoo ntawm cov kav dej puas thaum lub sijhawm teeb tsa thiab siv.
4. Dab tsi yog cov ntsiab lus tseem ceeb ntawm kev tswj hwm zoo hauv cov txheej txheem tsim khoom ntawm API 5L X42 welded kav, thiab yuav ua li cas kom ntseeg tau tias lawv ua raws li tus qauv?Teb: Cov ntsiab lus tseem ceeb hauv kev tsim khoom ntawm API 5L X42 welded kav muaj xws li: 1) Kev tshuaj xyuas cov khoom siv raw: nruj me ntsis xyuas cov tshuaj muaj pes tsawg leeg thiab cov khoom siv ntawm cov hlau phaj (los yog steel coil) kom ntseeg tau tias nws ua tau raws li API 5L cov qauv (C Tsawg dua lossis sib npaug li 0.26%, Mn Tsawg dua lossis sib npaug li 1.35% lossis sib npaug li 1.35% los yog L 0.030%, yield zog Ntau dua los yog sib npaug rau 289 MPa, tensile zog Ntau dua los yog sib npaug rau 414 MPa). 2) Cov txheej txheem tsim: tswj lub kaum sab xis thiab ceev kom ntseeg tau cov yeeb nkab txoj kab uas hla, phab ntsa thickness, thiab roundness ua tau raws li qhov yuav tsum tau, zam kev tsis sib xws ntawm phab ntsa thickness los yog elliptical deformation . 3) Peb siv cov txheej txheem AW welding (AW) thiab tsis, tswj cov vuam kub thiab lub sij hawm, thiab xyuas kom cov vuam seam zoo. 4) Kev kho cua sov: ua kev ntxhov siab rau annealing yog tias tsim nyog los tshem tawm cov vuam seem, txhim kho cov yeeb nkab kom nruj thiab qhov ruaj khov{13}}) Kev tshuaj xyuas zaum kawg: kev kuaj xyuas cov cuab yeej cuab tam (tensile test, impact test), UT, kev kuaj xyuas qhov tsis zoo (UT) Ua raws li API 5L cov qauv.
5. Dab tsi yog cov yam ntxwv ntawm cov tshuaj muaj pes tsawg leeg ntawm ASTM A312 Qib 304 welded kav, thiab lawv ua li cas rau lawv cov corrosion kuj?Teb: ASTM A312 Qib 304 welded kav yog austenitic stainless hlau nrog cov yam ntxwv ntawm cov tshuaj muaj pes tsawg leeg: chromium (Cr: 18.0-20.0%), npib tsib xee (Ni: 8.0-12.0%), carbon (C: 0.08% max), manganese (Mnhor: 0.0% phosp: 0.00%) max), sulfur (S: 0.030% max), thiab silicon (Si: 1.00% max). Cov ntsiab lus tseem ceeb ua rau kev tiv thaiv corrosion yog chromium thiab npib tsib xee. Chromium tsim ib qhov ntom ntom, ruaj khov chromium oxide zaj duab xis (Cr₂O₃) ntawm cov yeeb nkab nto, uas tuaj yeem tiv thaiv cov hlau los ntawm oxidized thiab corroded los ntawm cov xov xwm sab nraud. Nickel stabilizes cov qauv austenitic, txhim kho cov yeeb nkab toughness thiab ductility, thiab txhim khu nws tsis kam mus rau intergranular corrosion thiab pitting corrosion. Cov ntsiab lus carbon tsawg kuj txo qhov kev pheej hmoo ntawm intergranular corrosion tshwm sim los ntawm carbide nag lossis daus thaum vuam lossis kho cua sov.
