Rob Koltz thiab Dave Meyer tham txog cov yam ntxwv ntawm ferritic (magnetic) thiab austenitic (non-magnetic) ntawm cov hlau tsis xeb welded.Getty Images
Q: Kuv tab tom vuam lub tank ua los ntawm 316 stainless hlau, uas tsis yog-magnetic. Kuv tau pib vuam cov tank dej nrog ER316L hlau thiab pom tias cov welds yog magnetic. 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 nws yog ib qho tshwm sim heev rau dov 316 daim ntawv thiab cov ntawv kom tsis nyiam magnetism.
Cov hlau sib xyaw muaj nyob rau hauv ntau theem sib txawv nyob ntawm qhov kub thiab qib alloying, uas txhais tau tias cov atoms hauv cov hlau tau teeb tsa 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.
Muaj ntau hom 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 khov kho ua ferrite thiab hloov mus ua austenite thaum txias. Cov phaj thiab cov ntawv hlau tsis xeb Austenitic raug tswj kev txias thiab dov, uas feem ntau ua kom ntseeg tau tias txhua ferrite tau hloov mus ua austenite.
Nyob rau nruab nrab xyoo pua 20th, nws tau pom tias thaum vuam cov hlau tsis xeb austenitic, qhov muaj qee qhov ferrite hauv cov hlau vuam tiv thaiv microcracking (cracking) uas tuaj yeem tshwm sim thaum cov hlau filler yog austenitic tag nrho. Txhawm rau tiv thaiv microcracking, feem ntau cov hlau filler rau cov hlau tsis xeb austenitic yog tsim los muaj 3% txog 20% ​​ferrite, yog li lawv nyiam cov hlau nplaum. Qhov tseeb, cov ntsuas siv los ntsuas cov ntsiab lus ferrite hauv cov hlau tsis xeb welds kuj tseem tuaj yeem ntsuas qib ntawm kev nyiam sib nqus.
316 muaj qee daim ntawv thov uas txo cov khoom sib nqus ntawm qhov vuam yog qhov tseem ceeb, tab sis qhov no tsis tshua xav tau hauv cov tank. Kuv vam tias koj tuaj yeem txuas ntxiv soldering yam tsis muaj kev txhawj xeeb.
WELDER, yav tas los hu ua Practical Welding Today, qhia txog 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, nkag mus tau yooj yim 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.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv digital ntawm STAMPING Journal, uas muab cov kev nce qib tshiab tshaj plaws, cov kev coj ua zoo tshaj plaws thiab cov xov xwm kev lag luam rau kev lag luam hlau stamping.
Txaus siab rau kev nkag mus rau tsab ntawv digital ntawm The Additive Report kom paub txog yuav siv cov khoom siv ntxiv los txhim kho kev ua haujlwm zoo li cas thiab nce cov nyiaj tau los.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The Fabricator en Español, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.