Q1: Dab tsi yog qhov tseem ceeb thiab daim ntawv thov sib txawv ntawm A252 thiab A500 specifications?
A:ASTM A252 tus qauv npog welded thiab seamless steel yeeb nkab pawg siv rau lub hauv paus kev txhawb nqa hauv kev tsim kho tej yaam num -6. Nyob rau hauv sib piv, ASTM A500 npog txias-tsim welded thiab seamless carbon steel structural tubing rau daim ntaub ntawv xws li txuas hniav, vaj tse, thiab cov hom phiaj dav dav -6.
Q2: Dab tsi yog qhov pom kev pom qhov tsis xws luag hauv cov kav dej thiab cov kav dej, thiab lawv cuam tshuam li cas?
A:Feem ntau pom qhov tsis xws luag suav nrogUndercut(ib zawj melted rau hauv lub hauv paus hlau tsis sau los ntawm weld hlau),Sib tshooj(thaum molten hlau ntws mus rau hauv lub hauv paus hlau tsis muaj hlau), thiabConcavity(kev nyuaj siab ntawm qhov chaw vuam) -1. Cov teeb meem no tuaj yeem ua raws li cov ntsiab lus kev ntxhov siab, uas ua rau muaj kev tawg thiab txo cov qauv kev ntseeg siab -1.
Q3: Vim li cas girth weld tsis ua haujlwm yog qhov kev txhawj xeeb tseem ceeb, tshwj xeeb tshaj yog rau cov kav dej?
A:Girth weld tsis ua hauj lwm yog ib qho tseem ceeb ntawm cov kav dej tsis ua hauj lwm. Nws tshwm sim los ntawm kev sib koom ua ke ntawm kev thauj khoom ntxiv, qhov tsis xws luag, kev ua haujlwm degradation, thiab strain concentration. Cov teeb meem zoo likev tsis ncaj nceesthiabtsis muaj zog sib txuamnyob rau hauv qhov vuam los yog cua sov- thaj chaw cuam tshuam (HAZ) yog qhov tseem ceeb ntawm cov txiaj ntsig -1.
Q4: Yuav ua li cas tsis sib xws cov qauv ntawm cov yeeb nkab tsim thiab kev tsim kho ua rau muaj teeb meem?
A:Cov qauv kev tsis sib xws tuaj yeem ua rau cov yeeb nkab kawg tsis xws luag (xws li, concavity lossis convexity), misalignment, thiab tsis muaj kev nkag mus rau hauv welds. Qhov no feem ntau ua rau tsis yog -ua raws li kev soj ntsuam welds, yuav tsum tau rov ua haujlwm dua thiab ua rau muaj kev poob nyiaj txiag tseem ceeb thiab ua haujlwm qeeb -1.
Q5: Dab tsi yog qhov tseem ceeb ntawm cov tshuaj lom neeg thiab tshuaj ntsuam xyuas rau A500 yeeb nkab?
A:Raws li ASTM A500, txhua lub tshav kub ntawm cov hlau yuav tsum muaj antsuas kublos xyuas kom meej cov tshuaj muaj pes tsawg leeg (xws li, Carbon, Manganese) ua tau raws li cov qib-6. Mechanical xeem suav nrogkev ntsuam xyuas tensile(rau lub zog thiab elongation) thiabkev kuaj puas tsuajxws li flattening, flaring, thiab wedge crush tests los ntsuas weld thiab base hlau soundness.
