1.Dab tsi yog qhov cuam tshuam ncaj qha thiab loj tshaj ntawm kev laus ntawm qhov chaw (xeb, kev sib kis)?
Porosity thiab inclusions: Xeb (feem ntau yog Fe₂O₃·xH₂O) thiab nto- absorbed noo noo thiab roj decompose nyob rau hauv lub kub kub ntawm hluav taws xob arc, ua hydrogen thiab dej vapor. Yog tias cov pa roj no tsis tuaj yeem khiav tawm ntawm lub pas dej molten hauv lub sijhawm, lawv yuav tsim porosity hauv qhov vuam. Roj thiab tuab oxide nplai kuj tseem tuaj yeem tsim kev suav nrog.
Kev cuam tshuam ntawm arc stability: Tsis sib xws ntawm qhov chaw cuam tshuam rau kev ua haujlwm thiab kev ruaj ntseg ntawm arc, ua rau tsis muaj kev ruaj ntseg hauv cov txheej txheem vuam thiab tsis zoo weld tsim.
Ua kom muaj kev pheej hmoo ntawm hydrogen-induced cracking: Moisture thiab xeb yog qhov tseem ceeb ntawm hydrogen. Hydrogen atoms diffuse mus rau hauv vuam thiab tshav kub- thaj tsam cuam tshuam, thiab nyob rau hauv kev ntxhov siab, tuaj yeem ua rau qeeb qeeb qeeb, qhov tsis zoo txaus ntshai heev.
2.Dab tsi yog qhov cuam tshuam ntawm kev ua haujlwm hauv kev laus?
Cov txheej txheem: Tom qab txias dov deformation, cov kab ntawm cov pa roj carbon thiab nitrogen atoms yaj hauv cov hlau maj mam diffuse thiab sib sau ua ke ntawm crystal defects xws li dislocations dhau sij hawm (ie, "aging"), pinning dislocations.
Kev tshwm sim: Qhov no ua rau me ntsis nce ntawm cov khoom siv zog thiab hardness, thaum plasticity thiab toughness txo. Rau qhov sib sib zog nqus- kos cov ntawv hlau, qhov no ua rau lawv cov formability; rau welding, cov teebmeem tseem ceeb yog:
Embrittleness nyob rau hauv lub tshav kub- cuam tshuam cheeb tsam: Thaum lub sij hawm vuam, lub tshav kub- cuam tshuam cheeb tsam undergoes ib tug ceev ceev cua sov thiab txias voj voog. Cov cheeb tsam uas twb dhau los lawm muaj hnub nyoog hardening muaj qis toughness reserves, thiab nyob rau hauv kev sib xyaw ua ke los ntawm vuam kev nyuaj siab thiab hydrogen, lawv susceptibility rau cracking nce.
Deteriorated weld formability: Qhov txo qis hauv cov hlau hauv cov yas tuaj yeem cuam tshuam me ntsis rau qhov sib xws ntawm vuam tsim hauv qee txoj kev vuam (xws li kev siv vuam thiab ntug vuam).
3.Dab tsi yog qhov txawv ntawm qhov cuam tshuam ntawm ntau hom kev vuam?
Arc vuam (MIG/MAG, TIG, shielded hlau arc vuam): Muaj kev cuam tshuam los ntawm kev laus; kev tu tsis tiav inevitably ua rau muaj qhov tsis xws luag. Nws yog me ntsis rhiab heev rau kev laus ntawm sab hauv.
Resistance welding (qhov chaw vuam, seam vuam): Tsis tshua muaj kev cuam tshuam los ntawm kev laus nto. Xeb thiab cov kab mob kis tau zoo heev ua rau muaj kev tiv thaiv kev tiv thaiv, ua rau tsis ruaj khov weld zoo, spatter, tsis tiav kev nkag mus, thiab ceev electrode hnav. Kev ntxuav saum npoo yog qhov yuav tsum tau ua.
Laser welding / electron beam welding: Muaj qhov xav tau siab tshaj plaws rau kev huv huv. Txhua yam kab mob yuav cuam tshuam loj rau kev nqus lub zog, ua rau cov txheej txheem vuam tsis ruaj khov thiab vuam tsis zoo.
4.Koj muaj tswv yim dab tsi?
Qhov teeb meem tseem ceeb yog qhov deterioration deterioration tom qab aging ntawm txias -rolled coils yog thawj thiab feem ntau ncaj qha ua rau txo weldability. Internal aging yog ib qho tseem ceeb, tiam sis tseem ceeb tshaj.
Ua ntej-weld kev kho mob yog qhov tseem ceeb: nruj ua ntej-vuam tu yog ib qho tseem ceeb kauj ruam rau cov laus laus- dov kauj. Cov txheej txheem txheej txheem yuav tsum muaj xws li: degreasing, tshem tawm cov nplai thiab xeb (txoj kev siv tshuab lossis tshuaj), thiab vuam kom sai li sai tau tom qab ntxuav.
5.Yuav ntsuas qhov xwm txheej ntawm cov ntaub ntawv li cas?
Yog tias qhov txias txias -rolled coil tsuas muaj qhov xeb me me xwb, nws qhov weldability feem ntau tuaj yeem rov qab los tom qab ntxuav tag.
Txawm li cas los xij, yog tias muaj kev xeb loj heev (tshwj xeeb tshaj yog pitting lossis pitting corrosion) tau tshwm sim, tsis yog tsuas yog tu nyuaj, tab sis cov khoom nws tus kheej kuj yuav thinned los yog puas, yuav tsum tau downgrading los yog scrapping.
Rau cov txheej txheem tseem ceeb, yog tias xav tias muaj kev laus ntawm cov khoom hnyav, ib qho kev sim khoov yooj yim lossis cov qauv rau kev ntsuas cov cuab yeej cuab tam tuaj yeem txiav txim siab los ntsuas nws cov plasticity.