Rob Koltz thiab Dave Meyer tham txog cov yam ntxwv ntawm ferritic (magnetic) thiab austenitic (non-magnetic) ntawm cov hlau stainless uas weldable. Getty Images
Q: Kuv tab tom vuam lub tank stainless hlau 316 uas tsis muaj hlau nplaum. Kuv pib vuam cov tank dej nrog cov hlau ER316L thiab pom tias cov hlau nplaum yog hlau nplaum. Kuv puas ua qee yam tsis raug?
A: Tej zaum koj tsis muaj dab tsi txhawj txog. Nws yog ib txwm rau cov welds ua nrog ER316L kom nyiam magnetism, thiab cov ntawv dov thiab 316 daim ntawv feem ntau tsis nyiam magnetism.
Cov hlau sib xyaw muaj nyob rau hauv ntau theem sib txawv nyob ntawm qhov kub thiab qib doping, uas txhais tau tias cov atoms hauv cov hlau tau teeb tsa ua ntau txoj hauv kev sib txawv. Ob theem feem ntau yog austenite thiab ferrite. Austenite tsis yog hlau nplaum, thaum ferrite yog hlau nplaum.
Hauv cov hlau carbon ib txwm, austenite yog ib theem uas tsuas muaj nyob rau ntawm qhov kub siab, thiab thaum cov hlau txias, austenite hloov mus ua ferrite. Yog li ntawd, ntawm chav tsev kub, cov hlau carbon yog sib nqus.
Qee cov qib ntawm cov hlau tsis xeb, suav nrog 304 thiab 316, hu ua austenitic stainless steels vim tias lawv cov theem tseem ceeb yog austenite ntawm chav tsev kub. Cov hlau tsis xeb no tawv rau ferrite thiab tig mus rau austenite thaum txias. Austenitic stainless steel phaj thiab ntawv yog raug tswj kev txias thiab dov ua haujlwm uas feem ntau hloov tag nrho cov ferrite rau austenite.
Nyob rau nruab nrab xyoo pua 20th, nws tau pom tias thaum vuam cov hlau stainless austenitic, qhov muaj qee qhov ferrite hauv cov hlau vuam tiv thaiv cov kab nrib pleb me me (kev tawg) uas tuaj yeem tshwm sim thaum cov hlau filler yog austenitic tag nrho. Txhawm rau tiv thaiv cov kab nrib pleb me me, feem ntau cov hlau filler rau cov hlau stainless austenitic muaj ntawm 3% thiab 20% ferrite, yog li lawv nyiam cov hlau nplaum. Qhov tseeb, cov sensors siv los ntsuas cov ntsiab lus ferrite ntawm cov hlau stainless welds kuj tseem tuaj yeem ntsuas qib ntawm kev nyiam sib nqus.
316 yog siv rau hauv qee qhov kev siv uas nws yog qhov tseem ceeb kom txo qis cov khoom sib nqus ntawm qhov vuam, tab sis qhov no tsis tshua xav tau hauv cov tank. Kuv vam tias koj tuaj yeem txuas ntxiv soldering yam tsis muaj teeb meem.
WELDER, yav tas los hu ua Practical Welding Today, sawv cev rau cov neeg tiag tiag uas ua cov khoom uas peb siv thiab ua haujlwm nrog txhua hnub. Phau ntawv xov xwm no tau pab cov zej zog vuam hauv North America tau ntau tshaj 20 xyoo.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The FABRICATOR, yooj yim nkag mus rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Cov ntawv xov xwm digital ntawm The Tube & Pipe Journal tam sim no nkag tau tag nrho, muab kev nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Tau txais kev nkag mus rau STAMPING Journal tag nrho, uas muaj cov thev naus laus zis tshiab, cov 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 The Fabricator en Español tag nrho, koj muaj kev nkag mus rau cov peev txheej muaj txiaj ntsig zoo hauv kev lag luam.