Rob Koltz thiab Dave Meyer tham txog ferritic (magnetic) thiab austenitic (tsis-sib nqus) cov yam ntxwv ntawm weldable stainless hlau.Cov duab Getty
Q: Kuv tabtom vuam lub tank tsis sib nqus 316 stainless hlau.Kuv pib vuam dej tso tsheb hlau luam nrog ER316L hlau thiab pom tias cov welds yog hlau nplaum.Kuv puas ua tej yam tsis raug?
A: Tej zaum koj tsis muaj dab tsi txhawj txog.Nws yog ib txwm ua rau welds ua nrog ER316L kom nyiam cov hlau nplaum, thiab cov ntawv dov thiab 316 nplooj ntawv feem ntau tsis nyiam cov hlau nplaum.
Hlau alloys muaj nyob rau hauv ob peb theem sib txawv nyob ntawm qhov kub thiab txias, uas txhais tau hais tias cov atoms nyob rau hauv cov hlau yog teem nyob rau hauv ntau txoj kev.Ob theem feem ntau yog austenite thiab ferrite.Austenite tsis yog sib nqus, thaum ferrite yog sib nqus.
Hauv cov pa roj carbon zoo tib yam, austenite yog ib theem uas tsuas muaj nyob rau hauv qhov kub thiab txias, thiab thaum cov hlau txias, austenite hloov mus rau ferrite.Yog li ntawd, nyob rau hauv chav tsev kub, carbon hlau yog hlau nplaum.
Qee qib ntawm stainless hlau, suav nrog 304 thiab 316, hu ua austenitic stainless hlau vim tias lawv cov theem tseem ceeb yog austenite ntawm chav tsev kub.Cov hlau tsis muaj hlau no tawv rau ferrite thiab tig mus rau austenite thaum txias.Austenitic stainless hlau daim hlau thiab nplooj ntawv yog raug tswj kom txias thiab dov ua haujlwm uas feem ntau hloov tag nrho cov ferrite rau austenite.
Nyob rau hauv nruab nrab-20th caug xyoo, nws tau pom tias thaum welding austenitic stainless hlau, muaj ib co ferrite nyob rau hauv weld hlau tiv thaiv microcracks (cracking) uas tuaj yeem tshwm sim thaum cov hlau muab tub lim yog austenitic kiag li.Txhawm rau tiv thaiv microcracks, feem ntau cov hlau muab tub lim rau austenitic stainless hlau muaj nyob nruab nrab ntawm 3% thiab 20% ferrite, yog li lawv nyiam cov hlau nplaum.Qhov tseeb, cov sensors siv los ntsuas cov ntsiab lus ferrite ntawm stainless hlau welds kuj tuaj yeem ntsuas qib ntawm kev sib nqus sib nqus.
316 yog siv nyob rau hauv qee daim ntawv thov uas nws yog ib qho tseem ceeb kom txo qis cov khoom sib nqus ntawm cov vuam, tab sis qhov no tsis tshua xav tau hauv cov tso tsheb hlau luam.Kuv vam tias koj tuaj yeem txuas txuas ntxiv yam tsis muaj teeb meem.
WELDER, yav tas los hu ua Practical Welding Niaj hnub no, sawv cev rau cov neeg tiag tiag uas ua cov khoom peb siv thiab ua haujlwm nrog txhua hnub.Phau ntawv xov xwm no tau ua haujlwm rau cov koom haum vuam hauv North America rau ntau tshaj 20 xyoo.
Tam sim no nrog tag nrho nkag mus rau FABRICATOR cov ntawv luam tawm digital, nkag tau yooj yim rau cov peev txheej lag luam muaj txiaj ntsig.
Cov ntawv digital ntawm The Tube & Pipe Journal yog tam sim no nkag mus tau yooj yim, muab kev nkag tau yooj yim rau cov khoom lag luam muaj txiaj ntsig.
Tau txais tag nrho cov digital nkag mus rau STAMPING Journal, muaj cov thev naus laus zis tshiab, kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
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