Yuav Ua Li Cas Weld 304 Stainless Hlau rau Carbon Steel nrog E309-16
Vuam 304 stainless hlau rau me me los yog qis- alloy carbon steel yog ib qho kev sib txawv tshaj plaws - hlau sib koom ua ke hauv petrochemical, siab- nkoj thiab zaub mov- kev tsim khoom. Kev lag luam- tus qauv muab tub lim yog AWS A5.4 E309-16, a 23Cr-13Ni rutile-coated stick electrode uas ua rau muaj kev cuam tshuam los ntawm cov pa roj carbon-steel sab thaum ua kom lub weld tag nrho austenitic. Ntawm no yog cov txheej txheem kev cob qhia-npaj uas Ocean Vuam siv ntawm nws tus kheej siv cov pob qij txha.
Npaj qhov sib koom ua ke
Sib tsoo cov npoo ntawm ob sab kom txog thaum cov hlau nplaum raug nthuav tawm, tshem tawm cov nplais, cov txheej oxide, thiab cov thermal txiav slag nyob rau hauv ib cheeb tsam tsawg kawg yog 25 hli los ntawm bevel npoo; so nrog acetone kom tshem tawm cov roj thiab roj. Tsis tas yuav tsum tau preheating rau workpieces ntawm standard thickness (< 25 mm); for thicker carbon steel workpieces, preheat only the carbon steel side to 100–150°C.
Teem tam sim no, polarity thiab txoj hauj lwm
| Txoj kab uas hla | DCEP amperage (ntev) | Vertical / OH |
|---|---|---|
| Ø 2.5 hli | 50 – 85 A | 45 – 80 A |
| Ø 3.2 hli | 80 – 120 A | 70 – 110 A |
| Ø 4.0 hli | 100 – 150 A | 90 – 135 A |
Siv DCEP (rov qab DC polarity / electrode mus rau tus ncej zoo) ua kom muaj qhov ruaj khov thiab ua kom yooj yim tshem tawm cov slag molten. Yog tias tsuas muaj AC lub zog muaj, AC vuam kuj tseem siv tau.
Vuam txheej txheem
- Qhuav cov electrodes ntawm 250-300℃rau ib teev ua ntej siv thiab muab cia rau hauv ib tug rhuab pas nrig quiver.
Direct lub arc mus rau sab carbon steel rau 60% -70% ntawm weld hlaws ntev; qhov no rub cov hlau ntau rau hauv lub pas dej ua ke, tso cai rau lub siab -chromium-nickel muab tub lim kom ruaj ntseg nqus cov hlau.
Siv luv luv weld hlaws; ntiav cov vuam qis qis rau cov hauv paus hla thiab kev kub ceev rau kev hla dhau.
- Tuav qhov kub ntawm qhov sib cuam tshuam tsawg dua lossis sib npaug li 150℃txhawm rau tiv thaiv corrosion ntawm sab stainless hlau.
Tej yam tsis xws luag thiab yuav ua li cas tiv thaiv lawv
| Tsis zoo | Ua rau | Kho |
|---|---|---|
| Weld tawg ntawm txoj kab fusion | Tshaj tawm ntawm cov pa roj carbon- sab hlau | Txo cov amperage, siv luv arc, qaij electrode rau carbon steel |
| Porosity | Damp electrode / roj | Redry electrodes; degrease bevels |
| Sensitization ntawm 304 HAZ | Tshaj kub interpass | Khaws interpass Tsawg dua lossis sib npaug li 150 degree; siv hla-weld sequence |
FAQ
Q: Kuv puas yuav tsum tau siv E309L-16 lossis E309-16 zoo?
A: E309-16 (C Tsawg dua lossis sib npaug li 0.15 %) yog qhov zoo rau qhov kev pabcuam welded. Xaiv qhov qis -carbon E309L-16 (C Tsawg dua lossis sib npaug li 0.04 %) yog tias qhov sib koom ua ke yuav pom kev kho cua sov tom qab vuam lossis kev pabcuam ntub dej.
Q: Kuv puas tuaj yeem siv E308-16 rau 304-rau-carbon-steel pob qij txha?
A: Tsis yog. E308-16 (19Cr-9Ni) tsis muaj cov ntsiab lus hlau txaus los nqus cov pa roj carbon-steel sab thiab cov welding yuav kub-dhuav.
Q: Kuv puas xav tau PWHT?
A: Tsis yog feem ntau. Yog tias cov pa roj carbon- sab hlau yuav tsum tau code- yuam PWHT saum toj no ~ 370 degree, hloov mus rau E309L-16 kom tsis txhob muaj kev pheej hmoo ntawm sigma-theem.
