Tom ntej no, Hangao Tehc (Sepo Machinery) yuav ua rau koj nkag siab txog cov teeb meem uas yuav tshwm sim thaum lub sijhawm vuam thiab pab koj tiv thaiv thiab daws cov teeb meem no.
03 vuam kub tawg (crystallization tawg nyob rau hauv welds, liquefaction nrib pleb hauv thaj chaw kub-cuam tshuam rau hauv tshav kub-cuam tshuam)
Qhov rhiab heev ntawm thermal tawg feem ntau yog nyob ntawm cov tshuaj lom neeg muaj pes tsawg leeg, koom haum thiab ua haujlwm ntawm cov khoom siv. Ni yog ib qho yooj yim los ua daim ntawv loj me me los yog Eutectic nrog impurities xws li s thiab p. Tus kab ciav hlau thiab silicon yuav txhawb thermal tawg.
Weld leeg yog ib qho yooj yim los ua ib qho kev cocepar crystal crystal cov qauv muaj zog, uas yog qhov ua rau muaj kev phom sij ntawm cov teeb meem impurities thiab cov ntsiab lus. Qhov no txhawb nqa txoj kev tsim ntawm kev ua yeeb yam tsis tu ncua cov zaj duab xis thiab txhim kho qhov rhiab ntawm thermal tawg. Yog hais tias lub vuam tsis yog uniformly rhuab, nws yog ib qho yooj yim los ua cov kev ntxhov siab loj dua thiab txhawb nqa cov khoom siv vuam kub.
Kev tiv thaiv kev ntsuas:
a. Nruj me ntsis tswj cov ntsiab lus ntawm kev ua phem impurities s thiab p.
b. Kho lub koom haum ntawm Weld hlau. Lub dual-theem qauv weld muaj kev tawg ua zoo. Cov theem delta nyob rau hauv weld tuaj yeem kho cov nplej, tshem tawm cov kev coj ua ntawm cov khoom siv tsis zoo ntawm cov khoom siv hluav taws xob thiab cov teeb meem ntawm cov khoom ua kua txiv neej.
c. Kho lub weld hlau alloy muaj pes tsawg leeg. Cov ntsiab lus kev tsim nyog nce cov ntsiab lus ntawm MN, thiab n nyob rau hauv ib-theem Austenitic steel, thiab tantalum (uas tuaj yeem txo cov ntxig ntawm thermal tawg.
d. Cov kev ntsuas ntsuas. Txo qhov dhau ntawm Molten pas dej txhawm rau tiv thaiv kom tiv thaiv kev tsim cov muaju tuab. Siv cov tswv yim me me kub thiab cov ntoo khaub lig me me ntawm Weld hlaws dai. Ib Arc stabilizing ntaus ntawv tuaj yeem txuas ntxiv rau kev siv hluav taws xob rau kev txo thaj tsam ntawm lub nkoj molten, thiab txhim kho cov vuam ua kom zoo.
Piv txwv li, 25-20 autenitic steel yog nquag rau liquefaction tawg. Nws yog ua tau kom nruj me ntsis cov ntsiab lus los ntawm cov khoom siv hluav taws xob, ua kom muaj zog kub thiab ua kom sov me me ntawm cov pob qij txha.
04 embrittlement ntawm welded sib koom tes
Cov tshav kub-muaj zog hlau yuav tsum ua kom muaj cov plasticity welded los tiv thaiv cov kev kub ntxhov siab; Cov hlau tsawg-kub yog qhov yuav tsum muaj qhov qis qis-kub nyuaj los tiv thaiv qis-kub brittle fracture ntawm welded pob qij txha.
05 Loj Vuam Distortion
Vim tias qhov tsawg thermal conductivity thiab loj nthuav cov coefficient, lub vuam deformation yog qhov loj, thiab clamps tuaj yeem siv los tiv thaiv deformation. Lub vuam txoj kev ntawm Austenitic Stainless hlau thiab kev xaiv ntawm cov khoom siv vuam:
Anustenitic Stainless tuaj yeem welded los ntawm argon tungsten arc vuam (Molten Arg Vuam (Paw) thiab submerged arc vuam (paw).
Austenitic Stainless Hlau muaj qhov chaw vuam tsawg vim tias nws qhov kev xav tsis zoo, qis thermal tiv thaiv tau. Cov Nqes Tsaus Ntuj thiab cov hlaws dai yuav tsum tau siv los txo cov kev kub ntxhov siab, tiv thaiv kev kub ntxhov ntau, thiab txo cov thermal tawg rhiab.
Qhov muaj pes tsawg leeg ntawm cov khoom siv vuam, tshwj xeeb tshaj yog CR thiab ALOYING ntsiab, yog siab tshaj qhov ntawm cov khoom siv hauv paus. Siv cov ntaub ntawv vuam muaj cov nyiaj (4-12%) ntawm cov ferrite kom ntseeg tau tias qhov kev tawg ua kom zoo (kub tawg, ntxhov siab corrosion tawg) kev ua tau zoo ntawm Weld.
Thaum cov theem Ferrite tsis tau lossis tsis muaj peev xwm nyob hauv Weld, cov ntaub ntawv vuam yuav tsum yog cov khoom siv vuam uas muaj MO, MN thiab lwm cov khoom alloy.
C, S, P, SI, thiab NB nyob rau hauv lub vuam cov khoom yuav tsum tau tsawg li sai tau. NB yuav ua rau cov sandicification tawg hauv cov ntshiab Austenitic Weld, tab sis ib qho me me ntawm ferrite hauv weld tuaj yeem zam tau zoo.
Rau vuam cov qauv uas yuav tsum tau ua kom ruaj khov los yog kev ntxhov siab-relieved tom qab vuam, nb-uas muaj cov ntaub ntawv vuam feem ntau yog siv. Submerged Arc Vuam yog siv rau weld lub nruab nrab, thiab lub hlawv poob ntawm Flux thiab cov ntsiab lus hauv vuam hlau;
Vim yog qhov tob tob loj, kev saib xyuas yuav tsum tau coj los tiv thaiv qhov tshwm sim ntawm cov kub ntawm Weld thiab qhov kev txo qis ntawm kev cuam tshuam ntawm kev cuam tshuam kub. Saib xyuas yuav tsum tau them los xaiv ib lub pas hlau vuam hlau thiab ib txoj kev sib tw me me tawm. Cov hlau vuam yuav tsum muaj tsawg hauv SI, S, thiab P.
Cov ntsiab lus ferrite nyob rau hauv tshav kub-resistant stainless hlau weld yuav tsum tsis pub tshaj 5%. Rau kev txhawb nqa stainless hlau nrog CR thiab XI cov ntsiab lus ntau dua 20%, siab MN (6-8%)
Qhov tshwj xeeb flux rau Austenitic stainless hlau muaj ntau ntxiv nce ntawm weld thiab them nyiaj rau cov kev xav tau ntawm weld kev ua tau zoo thiab tshuaj lom neeg.
