1. Ua Ntej {-} vuam npaj: Tswj cov khoom nto thiab cov khoom sib xyaw
Nruj ntom nthe tu ntawm lub hauv paus hlau: SMA5570w txoj kev ua yeeb yaj kiab huab cua kev ua tau zoo kawg nkaus rau nws cov lus sib dhos (CU, CR, P). Tshem tawm cov khoom tsis huv los ntawm thaj chaw vuam (tsawg kawg 20mm ntawm ob tog ntawm pob qij txha) siv hlau txhuam, sandblasting, lossis acetone. Cov tsis huv zoo li:
Xuas, oxide nplai, lossis roj tuaj yeem ua rau porosity hauv weld thiab tsis muaj zog ntawm kev sib koom ua ke.
Cov ntsev (piv txwv li, los ntawm cov ntug dej hiav txwv) yuav rhuav tshem tus ncej- Weld patina tsim, txo corrosion tsis kam.
Xaiv Weathering -} Sib Xws Vuam Cov Khoom Siv: Tsis txhob siv cov pa roj carbon steel (piv txwv li, E6013). Xaiv cov neeg siv khoom nrog cov huab cua sib npaug los ua kom ntseeg tau Weld hlau muaj tib lub corrosion tiv taus raws li cov hlau. Cov kev xaiv sib xws muaj:
Cov thaiv kav hlau arc vuam (smaw): E9018-GW (lossis Jis Z 3211 D11-t9nb) electrodes.
Roj Hlau Hlau Arc Vuam (Gmaw): Er90s - gw xov hlau.
Preheat raws li phaj tuab thiab huab cua sov: SMA570W muaj tsawg kawg yog 570 MPa (83 ksi), ua rau nws tshav kub}} sib cuam tshuam rau thaj chaw txias. Yuav tsum muaj cov cai preheating:
Cov phiaj tsawg dua lossis sib npaug rau 12 hli tuab: preheat rau 80-120℃yog ambient temp <15 degree; Tsis muaj preheat yog tias temp ntau dua los yog sib npaug rau 15 degree.
Daim hlau> 12 hli tuab: preheat rau 120-180℃tsis hais txog cov huab cua temp.
Siv qhov kub kub - ntsuas tus pas ntsuas cwj mem lossis infrared tus pas ntsuas hluav taws xob kom paub meej tias muaj kev sib zog ua kom muaj zog (tshaj li xyoo 200 degree), uas tuaj yeem txwv cov hlau nruj.
2. VUAM Txheej Txheem Tswj: Zam kom zam Luv Brittleness thiab Weld Tsis Zoo
Txwv tsis pub sov tawm tswv yim nruj me ntsis: Cov tswv yim kub siab yuav coarsus nplej nyob rau hauv lub haz, txo qis thiab ua kom muaj kev ua haujlwm. Tswj tsis raws li nram no:
Smws: Siv cov ntau tam sim no ntawm 140-180A (rau 4.0mm elotodes) thiab kev nrawm ntawm 15-25cm / min. Cov lus sov sov yuav tsum nyob25-35 KJ /M(Tsis txhob tshaj 40 kj / cm).
Zam "weaving" (dav sab - rau {{sab kev txav ntawm electrode); Khaws cov ntaub qhwv qis qis dua lossis sib npaug rau 3 zaug ntawm cov hluav taws xob ntawm lub taub kom tsawg npaum li cas.
Ua kom muaj tsheb luv luv: Rau smaw, siv luv luv arc (arc ntev ≈ 1/2 lub taub ntawm lub taubcub) rau:
Txo cov pacitogen kev nqus, uas ua rau weld porosity thiab nkig martensite hauv lub haz.
Ua kom ntseeg tau cov fusion txaus ntawm weld hlau thiab luj hlau -}} Tiv thaiv tsis tiav Fusion (ib qho kev ua tsis tiav nyob hauv kev ua tiav qis hauv kev thauj khoom).
Kev tswj qhov kub: Nruab nrab ntawm vuam kis, khaws cov kub sib koom ua ke ntawm120-180 Qib(tib yam li preheat temp rau cov phiaj tuab). Tsis txhob cia cov koom ua ke txias dua 80 degree, raws li qhov no nce cov kev pheej hmoo txias; Yog tias txias tshwm sim, rov {- preheat rau cov temp yuav tsum ua ntej txuas ntxiv.
3. Post {{{- Kev Kho Vuam: Siv zog ua kom huab cua sab xis thiab daws kev ntxhov siab
Yuav tsum muaj kev ntxhov siab rau cov annealing tuab lossis siab -} Kev ntxhov siab tiv thaiv: Yog tias SMA570W yog siv rau thauj khoom - girders, nrog cov bickness ()
Sov tag nrho tivthaiv rau550-600 degree, tuav rau 1-2 teev (ib txog 25 hli tuab), tom qab ntawd txias qeeb (tsawg dua lossis sib npaug nrog 50℃/ teev) rau 300 tawm℃ua ntej cua txias.
Cov kauj ruam no relieves residle vuam kev ntxhov siab (uas tuaj yeem ua rau kev tawg qeeb) thiab ua kom muaj micrubtructure.
Zam kev sib tsoo ntawm weld℃tsis tas: Weld hlau cov huab cua patina cov qauv zoo tshaj plaws ntawm nws tus thawj yog - welded nto. If grinding is needed (eg, to remove spatter), use a fine-grit 砂轮 (>=120 grit) and avoid over-grinding-exposing fresh metal without weathering elements will cause localized rusting.
Post - weld tu rau patina tsim: Tom qab vuam thiab txias, so txoj kev sib koom ua ke nrog daim ntaub huv si dhuav tshem tawm hauv nruab nrab ntawm flux seem. Tsis txhob siv cov kua qaub acidic (piv txwv li, hydrochloric acid) - Lawv yuav corroy cov khoom siv xav tau rau patina.
4. Kev tshuaj xyuas zoo: tsom rau cov huab cua sib raug zoo thiab sib koom ua ke nyuaj
Tsis - Kev sim tshuaj ntsuam (NDT):
Ua Ultrasonic Kuajting (ut) nyob rau tag nrho Weld ntev los xyuas sab hauv tej yam (piv txwv li, tawg, vouch {2 2}} cov kabmob muaj peev xwm.
Kev kuaj xyuas kev coj ua (vt) thiab sib nqus cov kev sim siab (MT) ntawm Weld saum toj los yog sib tsoo- tej yam no raws li kev ntsuas corrosion.
Txheeb xyuas Weld hlau huab cua kev ua haujlwm (rau cov phiaj xwm tseem ceeb): Rau cov qauv nyob rau hauv qhov chaw hnyav (piv txwv li cov kab txuas dav dav), ntsuas qhov ntsuas hluav taws xob ntawm kev ua kom zoo nkauj (txhua xyoo corrosion tsawg dua lossis sib npaug rau 0.03 mm / xyoo).
