Rob Koltz thiab Dave Meyer sib tham txog ferritic (sib nqus) thiab austenitic (tsis-magnetic) cov yam ntxwv ntawm welded stainless hlau.Getty Images
Q: Kuv tabtom vuam lub tank ua los ntawm 316 stainless hlau, uas tsis yog-magnetic.Kuv tau pib vuam cov dej tso tsheb hlau luam nrog ER316L hlau thiab pom tias cov welds yog hlau nplaum.Kuv puas ua qee yam tsis raug?
A: Tej zaum koj yuav tsis muaj dab tsi txhawj txog.Nws yog ib txwm ua rau cov welds ua nrog ER316L kom nyiam cov hlau nplaum, thiab nws yog qhov ntau heev rau dov 316 nplooj ntawv thiab nplooj ntawv kom tsis txhob nyiam cov hlau nplaum.
Hlau alloys muaj nyob rau hauv ob peb theem sib txawv nyob ntawm qhov kub thiab txias theem, uas txhais tau hais tias cov atoms nyob rau hauv cov hlau yog teem sib txawv.Qhov ob feem ntau cov theem yog austenite thiab ferrite.Austenite yog non-magnetic thaum ferrite yog magnetic.
Nyob rau hauv cov pa roj carbon zoo tib yam, austenite yog ib theem uas tshwm sim tsuas yog nyob rau hauv high kub, thiab raws li cov hlau txias, austenite hloov mus rau hauv ferrite.Yog li ntawd, nyob rau hauv chav tsev kub, carbon hlau yog hlau nplaum.
Ob peb qib ntawm stainless hlau, suav nrog 304 thiab 316, hu ua austenitic stainless hlau vim tias lawv cov theem tseem ceeb yog austenite nyob rau hauv chav tsev kub.Cov steels tsis muaj zog rau ferrite thiab hloov mus rau austenite thaum txias.Austenitic stainless hlau daim hlau thiab cov nplooj ntawv undergo tswj cua txias thiab dov kev ua haujlwm, uas feem ntau tau ua kom ntseeg tau tias txhua qhov kev ua haujlwm.
Nyob rau hauv nruab nrab-20th caug xyoo, nws tau pom tias thaum vuam austenitic stainless hlau, muaj ib co ferrite nyob rau hauv cov hlau weld tiv thaiv microcracking (cracking) uas yuav tshwm sim thaum lub muab tub lim hlau yog kiag li austenitic. Txhawm rau tiv thaiv microcracking, feem ntau cov hlau muab tub lim rau austenitic stainless hlau yog tsim los kom muaj 0% 3% kev ntsuas rau lawv. ferrite cov ntsiab lus nyob rau hauv stainless hlau welds kuj tseem ntsuas cov qib ntawm magnetic attraction.
316 muaj qee qhov kev siv uas txo qis cov khoom sib nqus ntawm cov vuam yog qhov tseem ceeb, 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 kev txhawj xeeb.
WELDER, yav tas los siv vuam niaj hnub no, nthuav qhia cov neeg tiag tiag uas ua cov khoom uas peb siv thiab ua haujlwm nrog txhua hnub.Cov ntawv xov xwm no tau ua haujlwm rau cov koom haum vuam hauv North America rau ntau tshaj 20 xyoo.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm FABRICATOR, yooj yim nkag mus rau cov khoom 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.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv luam tawm digital ntawm STAMPING Journal, uas muab cov txheej txheem thev naus laus zis tshiab, kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm Tus Fabricator en Español, nkag tau yooj yim rau kev lag luam muaj txiaj ntsig.