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Raws li lub zog huv huv, lub zog cua tau txhim kho sai hauv xyoo tas los no. Nrog rau txoj kev loj hlob ntawm cov khoom siv hluav taws xob cua, cov hlau phaj siv tau ua kom tuab thiab tuab dua, thiab qee qhov tau dhau 100 hli, uas ua rau muaj kev xav tau ntau dua rau kev vuam. Tam sim no, Q355 lossis DH36 tau siv dav hauv cov cuab yeej siv hluav taws xob cua, thiab cov txheej txheem vuam feem ntau xaiv flux cored hlau roj tiv thaiv vuam (FCAW) thiab submerged arc vuam (SAW).
Nyob rau hauv cov txheej txheem ntawm cua turbine ntauwd manufacturing, nplua kab nrib pleb yuav tshwm sim nyob rau hauv lub fusion kab los yog tshav kub cuam tshuam cheeb tsam txoj hauj lwm tom qab welding ntawm lub qhov rooj ncej, thiab lub thicker lub steel phaj, qhov ntau dua qhov tawg nyiam. Qhov ua rau yog tshwm sim los ntawm kev ua tiav superposition ntawm kev ntxhov siab, vuam qhov kub, vuam ib ntus, hydrogen aggregation, thiab lwm yam, yog li nws yuav tsum tau daws los ntawm ntau qhov sib txuas xws li cov khoom siv vuam, vuam ntu, vuam kub, txheej txheem tswj, thiab lwm yam.
1 、 Kev xaiv cov khoom siv welding
Vim tias qhov vuam yog ib qho tseem ceeb heev, nws yog ib qho tsim nyog yuav tsum nyiam cov khoom siv vuam nrog cov ntsiab lus tsis zoo, zoo toughness thiab zoo tawg tsis kam, xws li peb GFL-71Ni (GB / T10045 T494T1-1 C1 A, AWS A5.20 E71T-1C -J).
Kev ua tau zoo ntawm GFL-71Ni cov khoom:
● Cov ntsiab lus impurity tsawg heev, P + S ≤0.012% (wt%) tuaj yeem tswj tau.
● Zoo heev elongation plasticity, elongation tom qab break≥27%.
● Zoo heev cuam tshuam toughness, -40 ° C cuam tshuam lub zog nqus ≥ ntau tshaj 100J.
● Kev ua tau zoo CTOD zoo heev.
● Diffusion hydrogen cov ntsiab lus H5 los yog tsawg dua.
2, Vuam txheej txheem tswj
(1) Vuam preheating thiab inter-channel kub tswj
Xa mus rau cov qauv tsim nyog thiab kev paub dhau los, nws raug nquahu kom xaiv preheating thiab inter-channel kub:
● 20 ~ 38mm tuab, preheating kub siab tshaj 75 ° C.
● 38 ~ 65mm tuab, preheating kub siab tshaj 100 ° C.
● Ntau tshaj 65mm tuab, preheating kub siab tshaj 125 ° C.
Nyob rau lub caij ntuj no, kev poob cua sov yuav tsum tau txiav txim siab, yog li nws yuav tsum tau kho los ntawm 30 ~ 50 ° C ntawm lub hauv paus no.
(2) Lub workpiece yuav tsum tsis tu ncua rhuab thaum lub sij hawm vuam txheej txheem kom muaj txaus inter-channel kub
● 20 ~ 38mm tuab, nws raug pom zoo kom tswj qhov kub thiab txias ntawm cov channel 130 ~ 160 ° C.
● 38 ~ 65mm tuab, nws raug nquahu kom tswj qhov kub ntawm cov channel 150 ~ 180 ° C.
● Ntau tshaj 65mm tuab, nws raug pom zoo kom tswj qhov kub ntawm cov channel 170 ~ 200 ° C.
Cov cuab yeej ntsuas kub yog qhov zoo tshaj plaws los siv cov cuab yeej ntsuas kub sib cuag, lossis ntsuas ntsuas kub tshwj xeeb.
3, Vuam specification tswj
| Vuam hlau Diameter | Pom zoo tsis | Kub input |
| 1.2 hli | 220-280A / 26-30V 300mm / min | 1.1-2.0KJ / hli |
| 1.4mm ib | 230-300A / 26-32V 300mm / min | 1.1-2.0KJ / hli |
Lus Cim 1: Cov tam sim no me me yuav tsum raug xaiv rau hauv qab vuam, thiab lub hau npog tuaj yeem tsim nyog loj dua, tab sis yuav tsum tsis txhob tshaj tus nqi pom zoo.
Lus Cim 2: Qhov dav ntawm ib lub hlaws hlaws yuav tsum tsis pub tshaj 20mm, thiab cov hlaws hlaws yuav tsum tau teem caij raws li qhov xwm txheej. Thaum qhov zawj dav dav, yuav tsum tau siv ntau qhov kev sib txuas, uas yog qhov zoo rau kev kho cov nplej.
4. Welding sequence tswj
Nws yog qhov zoo tshaj plaws los siv ntau tus neeg symmetrical welding rau annular welds, uas tuaj yeem txo qis kev ntxhov siab, thiab 4 tus neeg symmetrical vuam yog zoo dua li 2 tus neeg symmetrical vuam.
5, Kev tshem tawm hydrogen nyob rau hauv nruab nrab ntawm vuam
Kev tshem tawm hydrogen nyob rau hauv nruab nrab seem yog ib qho kev ntsuas los tiv thaiv cov tsub zuj zuj ntawm diffusible hydrogen nyob rau hauv vuam ntawm daim hlau tuab. Kev tshawb fawb qhia tau hais tias cov nyhuv yog pom tseeb rau cov phaj tuab loj dua 70mm. Cov txheej txheem ua haujlwm yog raws li nram no:
● Tsis txhob vuam mus txog 2/3 ntawm tag nrho cov hlaws.
● Dehydrogenation 250-300 ℃ × 2 ~ 3h.
● Txuas ntxiv mus kom txog thaum ua tiav ntawm kev tshem tawm hydrogen.
● Tom qab vuam, npog nrog rwb thaiv tsev paj rwb thiab maj mam txias rau chav sov.
6. Lwm yam teeb meem xav tau kev saib xyuas
● Ua ntej vuam, cov bevels yuav tsum huv thiab huv.
● Kev ua viav vias yuav tsum zam kom ntau li ntau tau. Nws raug nquahu kom siv cov hlaws ncaj welding thiab cov txheej txheem ntau dhau welding.
● Qhov ntev ntawm qhov txuas hauv qab vuam hlau yuav tsum tsis pub tshaj 25mm. Yog tias qhov zawj tob dhau lawm, thov xaiv lub conical nozzle.
● Tom qab ntxuav cov pa roj carbon monoxide, cov xim hlau yuav tsum tau polished ua ntej txuas ntxiv vuam.
Peb muaj ntau daim ntawv thov piv txwv ntawm vuam consumables siv nyob rau hauv lub tshuab fais fab kev lag luam, txais tos nug!
Post lub sij hawm: Nov-24-2022