Dab tsi yog cov khoom soj ntsuam rau vuam txheej txheem tsim nyog ntawmflange prefabrication?
Cov khoom tseem ceeb ntawm kev soj ntsuam rau cov txheej txheem vuam yog:
1.Weld pom kev soj ntsuam
Qhov siab tshaj ntawm cov hlau vuam yuav tsum tsis txhob qis dua lub hauv paus hlau, qhov tob thiab ntev ntawm lub undercut yuav tsum tsis txhob ntau tshaj tus qauv, thiab qhov chaw vuam yuav tsum tsis muaj kab nrib pleb, tsis muaj fusion, slag inclusions, arc craters thiab pores. .
2.NDT tshuaj xyuas cov welds
Kev soj ntsuam radiographic ntawm tubular kuaj yuav tsum tau ua raws li cov kev cai ntawm DL / T821, thiab qhov zoo ntawm cov welds yuav tsum tsis txhob qis dua tus qauv II. Kev ntsuam xyuas tsis muaj kev puas tsuaj tsis muaj feem xyuam rau cov khoom siv ntawm cov khoom siv welded, tab sis nws yog ib qho tsim nyog yuav tsum nkag siab txog lub xeev ntawm vuam tsis xws luag hauv "kev ntsuam xyuas". Nyob rau tib lub sijhawm, nws kuj tseem xav tias nws yuav tsum zam thaum txiav cov khoom xeem. Yog li ntawd, nws muaj nyob rau hauv cov khoom soj ntsuam. Nws yuav tsum yog. Lub hom phiaj tseem ceeb ntawm kev tshuaj xyuas pob txha yog txhawm rau xyuas qhov tsis zoo ntawm cov vuam macroscopic ntawm cov hlau vuam, uas yog nyob rau hauv qhov ntsuas ntawm qhov kev ua haujlwm ntawm cov welder thiab tsis tuaj yeem siv ncaj qha los ntsuas cov khoom siv kho tshuab, yog li nws raug tshem tawm.
Welding Txheej Txheem Kev Tsim Nyog
Tensile Test (Dimensional Specimen)
① Qhov siab tshaj ntawm cov qauv yuav tsum tau muab tshem tawm los ntawm mechanically thiab yuav tsum yaug nrog lub hauv paus hlau.
② Thickness ntawm daim ntawv xeem: thaum lub thickness tsawg dua 30 hli, tag nrho-thickness xeem daim yuav siv tau, thiab thaum lub thickness yog ntau tshaj 30 hli, nws yuav ua tau rau hauv ob los yog ntau tshaj ntawm cov qauv.
③ Lub zog tensile ntawm txhua tus qauv yuav tsum tsis txhob qis dua qhov qis qis ntawm lub hauv paus hlau.
④ Lub zog tensile ntawm cov qauv hlau tsis sib xws yuav tsum tsis txhob qis dua qhov qis qis ntawm cov hlau hauv qab ntawm sab qis.
⑤ Ob lossis ntau qhov qauv yuav tsum raug kuaj xyuas tensile, thiab tus nqi nruab nrab ntawm txhua pab pawg ntawm cov qauv yuav tsum tsis pub dhau qhov txwv qis ntawm tus nqi ntawm lub hauv paus hlau.
Khoov xeem
① Kev khoov cov qauv tuaj yeem muab faib ua lub ntsej muag hloov pauv (rov qab), lub ntsej muag longitudinal khoov (rov qab), thiab sab nraub qaum.
② Thaum T tsawg dua 10, T=t; thaum T ntau dua t, t =10. Qhov dav ntawm cov qauv: 40, 20, 10 (unit: mm).
③ Qhov siab tshaj ntawm cov qauv yuav tsum tau muab tshem tawm los ntawm mechanically kom tus thawj nto ntawm lub hauv paus hlau, thiab lub undercut thiab lub weld cag yuav tsum tsis txhob muab tshem tawm.
④ Yog tias muaj qhov tsis xws luag ntawm sab nraub qaum, sab loj dua yuav tsum yog qhov tensile nto.
⑤ Peb lub ntsiab tseem ceeb uas cuam tshuam rau qhov kev sim khoov yog: qhov sib piv ntawm qhov dav mus rau qhov tuab ntawm cov qauv, lub kaum sab xis thiab txoj kab uas hla ntawm qhov khoov axis.
Txoj kev ntsuas kev khoov thiab lwm yam kev cai ntawm SD340-89 cov cai tsis sib haum rau qhov elongation ntawm cov khoom nws tus kheej.
Yog li ntawd, qhov elongation ntawm sab nrauv ntawm cov qauv dabtsi yog khoov tau dhau qhov kev txwv qis ntawm qhov elongation rau qee cov hlau, yog li nws tsis tsim nyog. .
Txhawm rau ua qhov kev sim khoov kom tsim nyog rau kev txiav txim siab plasticity, cov kev cai tshiab ua cov kev cai hauv qab no: txoj kev khoov khoov yog ua raws li GB / T232 hlau dabtsi yog khoov txoj kev.
Cov kev sim khoov tau teev tseg raws li hauv qab no: lub thickness ntawm cov qauv yog tsawg dua los yog sib npaug rau 10, thiab txoj kab uas hla ntawm dabtsi yog khoov axis (D) yog 4t. Qhov kev ncua deb ntawm kev txhawb nqa (Lmm) yog 6t ntxiv rau 3, thiab lub kaum sab xis yog 180 degrees.
Rau cov hlau uas nws qhov kev txwv qis ntawm elongation tsawg dua 20 feem pua tau teev nyob rau hauv cov qauv thiab cov txheej txheem, yog tias qhov kev sim khoov tsis ua haujlwm thiab qhov ntsuas qhov elongation tsawg dua 20 feem pua, nws raug tso cai kom nce txoj kab uas hla ntawm txoj hlua khoov rau kev sim. .
Ntawm qhov tensile saum npoo ntawm cov qauv, yuav tsum tsis txhob muaj qhov tsis xws luag nrog qhov ntev ntawm ntau tshaj 3 hli nyob rau hauv ib qho kev taw qhia nyob rau hauv lub weld thiab tshav kub cuam tshuam cheeb tsam, tshwj tsis yog rau cov kab nrib pleb ntawm cov npoo thiab cov ces kaum, tab sis cov kab nrib pleb tshwm sim los ntawm slag inclusion defects yuav tsum. suav.
Impact test
Ntev npaum li lub siab-cov kabmob thiab cov kabmob load-cov kabmob ua tau raws li cov xwm txheej rau kev ua cov qauv kuaj kev cuam tshuam, qhov kev xeem cuam tshuam yuav tsum tau ua.
Yog li, nws yuav tsum tau ua thaum muaj cov xwm txheej hauv qab no:
① Yog tias qhov tuab ntawm qhov vuam tsis txaus rau kev kuaj, nws yuav tsis ua.
② Thaum lub thickness ntawm lub vuam yog ntau dua los yog sib npaug rau 16 hli, yuav tsum muaj kev ntsuam xyuas cuam tshuam.
③ Kev soj ntsuam kev tsim nyog tus qauv: Qhov nruab nrab tus nqi ntawm peb cov qauv yuav tsum tsis txhob qis dua qhov qis tshaj teev nyob rau hauv cov ntaub ntawv tseem ceeb, thiab ib qho ntawm lawv yuav tsum tsis txhob qis dua 70 feem pua ntawm cov nqi teev.
Kev tshuaj xyuas metallographic
Rau kaum pob qij txha ntawm cov ntawv raj, tib qhov kev txiav yuav tsum tsis txhob muaj ob qhov chaw soj ntsuam.
Kev kuaj Hardness
Lub hardness ntawm vuam thiab tshav kub cuam tshuam cheeb tsam yuav tsum tsis txhob qis dua 90 feem pua ntawm cov hardness tus nqi, tsis tshaj Brinell hardness ntawm lub hauv paus hlau ntxiv rau 100HB, thiab tsis pub tshaj cov nram qab no yuav tsum tau:
Thaum tag nrho cov ntsiab lus alloy tsawg dua 3 feem pua, qhov hardness tsawg dua lossis sib npaug li 270HB; Thaum tag nrho cov ntsiab lus sib npaug rau 3 ~ 10, qhov hardness tsawg dua los yog sib npaug rau 300HB;
Thaum tag nrho cov ntsiab lus ntawm cov alloy ntau dua 10, qhov hardness tsawg dua los yog sib npaug rau 350HB P91 steel 220 ~ 240 yog qhov zoo tshaj plaws.
