Rau cov neeg siv khoom xav tau vuam ASTM A588 Corten Steel nrog 304 stainless hlau (feem ntau hauv cov khoom sib xyaw- cov khoom siv xws li cov chaw ntug dej hiav txwv), xaiv cov vuam hlau zoo thiab kho qhov ntsuas tam sim no yog qhov tseem ceeb kom tsis txhob galvanic corrosion thiab xyuas kom muaj zog sib koom ua ke. Kab lus no qhia meej txog cov ntsiab lus tseem ceeb rau kev siv tswv yim.
1. Qhov tseem ceeb vuam hlau xaiv
Lub hauv paus ntsiab lus tseem ceeb yog xaiv aduplex stainless hlau welding hlauuas sib npaug corrosion kuj thiab compatibility nrog ob lub hauv paus ntaub ntawv: - pom zoo hlau qib: ER2209 (nyiam dua) los yog ER2594. Cov xov hlau duplex no muaj 22-25% Cr, 8-10% Ni, thiab 2-3% Mo, muab kev tiv thaiv corrosion ze rau 304 stainless hlau thiab cov khoom siv zoo sib xws nrog ASTM A588. - Tsis txhob siv cov pa roj carbon steel los yog cov hlau tsis muaj steel hlau: Carbon steel hlau (xws li, ER70S-6) yuav ua rau galvanic corrosion ntawm qhov sib koom ua ke; 308L / 309L stainless hlau xaim tsis zoo nrog ASTM A588, ua rau cov pob qij txha tawg.
2. Cov lus qhia txog kev hloov pauv tam sim no
Ua ntej MIG / MAG welding (feem ntau haum rau qhov sib txawv ntawm qhov sib txawv). Parameters sib txawv los ntawm txoj kab uas hla ntawm hlau thiab sib koom ua ke, nrog rau cov tub ntxhais tsom rauTsawg cua sov inputlos tiv thaiv grain coarsening thiab intergranular corrosion:
Hlau Dia 1.2mm (Common): DC rov qab polarity (DCEP) yog qhov yuav tsum tau ua. Tam sim no: 180-220A; Voltage: 24-28V; Kev khiav ceev: 30-40 cm / min. Thaum tshav kub kub input yuav tsum tswj ntawm 1.2-1.8 kJ / mm.
Hlau Dia 1.0mm: DCEP. Tam sim no: 140-180A; Voltage: 22{9}}26V; Kev khiav ceev: 25-35 cm / min. Haum rau nyias-gauge (tsawg dua los yog sib npaug rau 6 hli) ASTM A588 thiab 304 nplooj ntawv kom tsis txhob hlawv-los ntawm.
Thick -Gauge Joints (Ntau dua lossis sib npaug li 8mm): Siv ntau- hla vuam. Txo tam sim no los ntawm 10-15% rau txhua qhov txuas txuas ntxiv los tswj cov txheej txheem kub qis dua lossis sib npaug li 150 degree. Tsis txhob txuas txuas txuas ntxiv kom tsis txhob muaj cua sov.
3. Cov lus pom zoo rau kev siv vuam
Ua ntej-Kev Npaj Weld: Ntxuav qhov sib koom ua ke (tshem tawm xeb, roj, thiab oxide zaj duab xis) tsis pub dhau 20 hli ntawm ntug vuam. Rau 304 stainless hlau, zam cov pa roj carbon monoxide (siv lub siab sib tsoo log).
Tiv thaiv Gas: Siv 98% Ar + 2% CO₂ lossis ntshiab Ar (rau ER2209) kom muaj kev ruaj ntseg zoo arc thiab weld hlaws tsim. Gas ntws tus nqi: 18-22 L / min.
Ncej -Kev kho Weld: Tsis xav tau kev kho cua sov. Grind lub weld hlaws kom tshem tawm spatter thiab ntse npoo. Rau ib puag ncig ntawm ntug dej hiav txwv, siv txheej nyias nyias ntawm kev tiv thaiv -corrosion sealant rau qhov sib koom ua ke los txhim kho galvanic corrosion kuj.
Nyob rau hauv cov ntsiab lus, vuam ASTM A588 nrog 304 stainless hlau yuav tsum tau duplex stainless hlau nyob ntawm tej (ER2209/ER2594) thiab tsawg- tshav kub- input tam sim no tsis. Ua raws li cov lus qhia nruj me ntsis ua kom muaj kev ntseeg tau ntawm kev sib koom ua ke thiab tsis txhob muaj kev pheej hmoo corrosion, haum rau cov khoom siv sib txawv hauv qhov hnyav sab nraum zoov.
