12Cr1MoVG High Pressure Boiler Tube Vuam txheej txheem

1. Vuam txoj kev
Thaum welding high-pressure boiler alloy kav, qhov zoo yuav tsum tau rau hauv qab weld yog kuj siab. Tsis tsuas yog cov welds yuav tsum tau nkag mus rau tag nrho thiab lub nraub qaum nto du thiab tsis muaj qhov tsis xws luag, tab sis lawv kuj yuav tsum tsis txhob muaj slag lossis tsawg slag nyob rau sab nraub qaum, txwv tsis pub kev ua haujlwm ruaj ntseg ntawm cov cuab yeej yuav raug cuam tshuam. . Yog li ntawd, cov txheej txheem vuam ntawm phau ntawv tungsten arc vuam rau lub hauv paus thiab phau ntawv arc vuam rau kev txhaws thiab npog yog siv.
2. Kev xaiv cov khoom siv vuam
Phau ntawv tungsten arc vuam hlau: ER55-B2-MnV (TIG-R31) vuam hlau, hlau txoj kab uas hla φ2.5mm.
Phau ntawv arc vuam electrode: R317 (E5515-B2) electrode, txoj kab uas hla φ3.2mm, φ4mm.
3. Preheating ua ntej vuam
Preheating tuaj yeem ua rau qeeb qeeb ntawm qhov txias ntawm qhov vuam thiab qhov chaw tshav kub, uas yuav pab tau kom tsis txhob tsim cov txheej txheem hardened, pab kom dim ntawm hydrogen nyob rau hauv vuam cheeb tsam, thiab tiv thaiv vuam tawg. Vim muaj cov ntsiab lus carbon siab thiab cov ntsiab lus alloying ntawm 12Cr1MoV steel, qhov kub thiab txias tau xaiv los ua 200 ~ 300 degree. Lub preheating cheeb tsam yog nyob rau hauv lub weld seam thiab yog tsawg kawg yog 100 hli ntawm ob sab. Thaum lub sij hawm tag nrho cov txheej txheem welding, qhov kub ntawm interlayer yuav tsum tsis txhob qis dua qhov preheating kub.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4. Kev ua haujlwm vuam
Kev vuam ntawm 12Cr1MoVG steel tsis tsuas yog yuav tsum tau tswj nruj nruj ntawm cov vuam specification tsis, tab sis kuj vuam ua hauj lwm muaj kev cuam tshuam tseem ceeb rau qhov zoo ntawm kev sib koom tes. Cov kauj ruam ua haujlwm welding yog raws li hauv qab no:

ib. Argon arc vuam primer: Kho cov yeeb nkab haum kab rov tav, siv luv luv arc thaum vuam, thiab khaws cov phom vuam raws li perpendicular mus rau saum npoo ntawm lub workpiece li ua tau, uas yog qhov zoo rau kev tiv thaiv lub vuam pas dej ua ke los ntawm argon roj. Cov phom vuam thiab vuam hlau tuaj yeem ua viav vias me ntsis tom qab kom ntseeg tau tias nkag mus rau ob sab ntawm qhov zawj. Nyob rau tib lub sijhawm, qhov kub ntawm lub pas dej molten yuav tsum tau tswj kom tsis txhob muaj kev sib tsoo thiab vuam tsis xws luag. Ntawm thaj chaw sib koom ua ke, siv lub kaum sab xis grinder txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau tshem tawm qhov tsis xws luag xws li arc kaw cov kab nrib pleb thiab qhov hws ntawm lub arc crater, thiab tom qab ntawd txuas ntxiv arc vuam.

b. Thaum sau nrog arc vuam, luv luv arc vuam yuav tsum tau siv, thiab lub tshav kub input yuav tsum tsis txhob loj dhau. Yog tias siv lub vuam arc ntev, tsis yog tsuas yog yuav muaj teeb meem xws li qhov tsis ruaj tsis khov arc combustion, qhov nkag mus tob, cov hlau loj loj, thiab ua kom tawg ntawm cov hlau tsis zoo, tab sis kuj muaj qhov tsis xws luag xws li undercuts thiab tsis tiav vuam yuav yooj yim tshwm sim. Nyob rau tib lub sijhawm, N 2 thiab O 2 hauv huab cua yuav ua rau cov pa phem xws li vuam tuaj yeem nkag mus rau hauv lub pas dej molten thiab tsim cov pore tsis xws luag hauv cov vuam. Thaum welding, ib tug me me crescent-shaped sawb yuav siv tau. Nyob ntawm ob sab ntawm qhov zawj rau 0.5 ~ 1 thib ob. Vuam slag yuav tsum tau ntxuav kom huv si ntawm cov txheej txheem vuam. Thaum welding tsis xws li pores pom, siv lub kaum sab xis grinder kom tshem tawm cov vuam tsis xws luag. Thaum kaw lub arc, lub arc crater yuav tsum tau ntim kom tsis txhob Crater tawg. Cov pob qij txha ntawm cov khaubncaws sab nraud povtseg yuav tsum tau staggered thiab yuav tsum tsis txhob sib tshooj.

c. Thaum arc vuam lub hau, qhov vuam tam sim no me ntsis me dua li ntawm qhov txhaws. Lub kaum sab xis ntawm lub vuam pas nrig yuav tsum raug xaiv thiab tus pas nrig yuav tsum tau thauj tusyees kom tsis txhob muaj qhov tsis xws luag ntawm ntug ntawm qhov zawj. Lub weld reinforcement yuav tsum tau tswj tsis pub dhau 1 ~ 3 hli kom tsis txhob muaj kev ntxhov siab hauv kev sib koom ua ke thaum siv.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5. Kev kho cua sov tom qab vuam
Tom qab vuam, kev kho cua sov yuav tsum muaj kev ntxhov siab, thiab tag nrho cov vuam sib txuas yog rhuab mus rau 720-760 degree . Tom qab qhov ntsuas kub tsis tu ncua rau 1 mus rau 2 teev, lub vuam seam thiab qhov ze ntawm seam yuav tsum tau them nrog cov khoom siv rwb thaiv tsev kom cov sib koom ua ke maj mam txias mus rau chav sov. Lub hom phiaj ntawm kev kho cua sov yog txhawm rau tshem tawm lossis txo cov txheej txheem tawv tawv hauv thaj tsam cuam tshuam, ua kom cov duab thiab tawv, ua kom zoo dua cov vuam seem, thiab tib lub sijhawm pab txhawb kev khiav tawm ntawm diffuse hydrogen, yog li txo qhov nyiam ntawm qhov txias txias.