Stainless steel can be divided into four categories according to its steel structure, namely, austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, and austenitic-ferritic duplex stainless steel. Cov hauv qab no tsuas yog ntsuas qhov kev sib tw ntawm cov yam ntxwv ntawm Austenitic Stainless hlau thiab ob-txoj kev stainless hlau.
(1) VUAM NTAWM AUSTENITIC STEEL
Anustenitic Stainless hlau yooj yim dua rau weld tshaj li lwm tus hlau tsis xeb. Tsis muaj theem hloov pauv tshwm sim ntawm ib qho kub thiab nws tsis rhiab rau hydrogen embrittlement. Austenitic stainless hlau pob qij txha tseem muaj cov xim zoo dua thiab tawv hauv lub xeev welded. Cov teeb meem tseem ceeb ntawm vuam yog: vuam kub tawg, embrittlement, intergranular corrosion thiab kev nyuaj siab corrosion. Ib qho ntxiv, vim tsis zoo thermal conductivity, loj linear nthuav kev coefficient, loj vuam kev ntxhov siab thiab deformation. Thaum vuam, lub vuam cua sov tawm tswv yim yuav tsum me me li sai tau, thiab yuav tsum tsis txhob yog preheated, thiab tus interlayer kub yuav tsum tau qis dua. Tus interlayer kub yuav tsum tau tswj hwm hauv qab 60 ℃, thiab cov pob qij txha weld yuav tsum yog staggered. Txhawm rau kom cov tswv yim tshav kub, lub vuam ceev yuav tsum tsis txhob muaj ntau ntxiv, tab sis yuav tsum tau yoog kom txo tau cov vuam tam sim no.
(2) Vuam ntawm Austenitic-Ferritic ob-theem stainless hlau
Austenitic-Ferritic Bidirectional Stainless hlau yog lub duplex stainless hlau tsim ntawm Austenite thiab Ferrite. Nws muab cov txiaj ntsig ntawm cov hlau Austenitic thiab ferritic steel thiab yog li nws muaj cov yam ntxwv ntawm lub zog siab, zoo corrosion tsis kam thiab yooj yim vuam. Tam sim no, muaj ntau hom ntawm ob hom Duplex Stainless hlau: CR18, CR21, thiab CR25. Cov yam ntxwv tseem ceeb ntawm hom kev siv hlau vuam no yog: piv nrog Austenitic Stainless hlau, nws muaj qis dua thermal nyiam; Piv nrog ntshiab ferritic stainless hlau, nws muaj qhov qis dua ntawm cov vuam, thiab cov qib ntawm cov cua sov-cuam tshuam rau nws kuj tseem qis dua, yog li lub weldability zoo dua.
Vim tias qhov kev ua haujlwm vuam zoo ntawm hom hlau no, preheating thiab tom qab cua sov tsis tsim nyog thaum vuam. Nyias daim hlau yuav tsum welded nrog tig, thiab nruab nrab thiab tuab daim hlau tuaj yeem wifed nrog electrode arc vuam. Tshwj xeeb elecition nrog cov lus sib xyaw zoo sib xws rau lub hauv paus hlau lossis austenitic electrode nrog cov ntsiab lus muaj roj carbon tsawg yuav tsum tau xaiv rau cov khoom siv arc vuam. Nickel-based alloy electrodes tseem tuaj yeem siv rau CR25 dual-theem steel.
Vim muaj kev lag luam loj ntawm ferrite nyob rau hauv ib tug vuam zoo heev ntawm ferritic steels tuaj yeem muaj kev sib tw ntawm lub ntsej muag, yog li koj tseem yuav tsum tau them sai sai rau nws thaum vuam. Thaum vuam duplex stainless hlau uas tsis muaj ni lossis tsawg, muaj ib qho kev nyiam ntawm ib leeg-theem coarsening nyob rau hauv cov tshav kub-cuam tshuam cheeb tsam. Nyob rau lub sijhawm no, saib xyuas yuav tsum tau them los tswj lub vuam cua sov, thiab sim siv cov khoom siv tam sim no, thiab nqaim dhau vuam. Thiab ntau dua vuam los tiv thaiv cov nplej coarsening thiab ib leeg-theem ferrite nyob rau hauv cov txheej kub yuav tsum tsis txhob siab dhau, thiab nws yog qhov zoo tshaj plaws rau weld kis dhau tom qab txias.
Ob qho ntawm cov saum toj no yog cov hom uas yooj yim dua rau Weld. Txawm li cas los xij, tseem muaj cov hom hlau stainless hlau nrog cov neeg pluag weldability, xws li ferrite. Nyob rau lub sijhawm no, peb pom zoo kom koj xav txog peb patented vuam ib tug tev-Electromagnetic tswj arc stabilization ntaus. Hangao Tech (Seko Machinery) Tshaj tawm cov kev paub thiab cov ntaub ntawv hauv Welded Yeeb Nkab tau txhim kho, nws tseem tuaj yeem siv mus rau hauv tus account qhov zoo ntawm Weld. Qhov zoo tshaj ntawm Weld tau lees tias, thiab thaum cov yeeb nkab welded nkag mus ua, cov ntawv kab ntawv tom ntej tuaj yeem raug txo thiab cov zis tuaj yeem nce ntxiv.
