1. Q: Dab tsi ua rau "natural cracking" nyob rau hauv lub vuam seam tam sim ntawd tom qab ERW vuam?
A:Qhov no cracking tshwm sim tom qab lub weld hla lub nyem yob. Nws feem ntau yog vimntau dhau ua residual kev nyuaj siab, vuam kub tsis zoo (tsawg los yog siab dhau), los yog tsis txaus extrusion quab yuam. Cov kab nrib pleb feem ntau tshwm grey nrog ib tug canine- hniav qauv -6.
2. Q: Koj yuav ua li cas sib txawv ntawm "kub tawg" thiab "txias tawg" hauv welds?
A: Kub tawgtshwm sim ntawm qhov kub thiab txias thaum lub sij hawm solidification thiab tshwm raws li intergranular puas, feem ntau nrog oxidized discoloration.Txias tawg(feem ntau hydrogen-induced) tshwm sim tom qab lub vuam tau txias, qee zaum teev lossis hnub tom qab. Lawv feem ntau yog transgranular thiab zoo li ci, huv fractures nyob rau hauv siab -lub zog steels los yog tuab seem -2-10.
3. Q: Dab tsi yog "weld misalignment" (Hi-Lo) thiab nws tshwm sim li cas?
A:Weld misalignment yog thaum ob lub welded npoo tsis nyob rau tib lub dav hlau, tsim kom muaj qhov offset. Ua rau muaj xws litsis sib npaug strip thickness, Kev kho tsis raug ntawm kev sib sau yob los yog nyem yob, puas lawm bearings, los yog lub cev tsis ruaj khov. Nws tsim cov ntsiab lus kev ntxhov siab thiab tuaj yeem nkaum ib qho -sab burrs -6.
4. Q: Vim li cas thiaj tuaj yeem tawg thaum lub sijhawm ua haujlwm ntawm cov yeeb nkab txuas?
A:Txawm hais tias lub vuam nws tus kheej yog suab, cov kab nrib pleb tuaj yeem tshwm sim thaum lub sij hawm kho tshuab. Qhov no qhia tau hais tias lub vuam hlau los yog HAZ muajtsis txaus ductilitylos yog muajmicroscopic flawsuas ua raws li kev ntxhov siab. Lub zog tensile siab thaum lub sij hawm nthuav dav qhib qhov tsis xws luag, ua rau tsis ua hauj lwm -2-10.
5. Q: Dab tsi yog qhov tseem ceeb ntawm "exogenous particles" hauv cov hlau vuam?
A:Cov no yog cov khoom txawv teb chaws (xws li, slag, cov khoom siv refractory, los yog khw-cov khib nyiab hauv pem teb) uas ua rau hauv pas dej ua ke. Lawv tsim ibhauv zos hloov hauv tshuaj muaj pes tsawg leegthiab astructural inhomogeneity. Qhov kev tsis sib haum no ua rau muaj kev ntxhov siab thiab tuaj yeem pib tawg, tshwj xeeb tshaj yog nyob rau hauv kev thauj khoom dynamic -2-10.
