Yuav ua li cas Weld HK-40 Cracking Rauv Tubes nrog E310-16 Electrode
HK-40 thiab HP-Nb yog cov classic 25Cr-20Ni cam khwb cia cua sov-cov raj siv tau rau hauv cov ethylene cracking furnaces thiab hydrogen reformers, qhov chaw ua haujlwm kub txog 1000-1100℃. AWS A5.4 E310-16 is the go-to SMAW filler for site butt welds and radiant-tube repairs. Ntawm no yog cov txheej txheem kev cob qhia teb.
Paub meej tias lub hauv paus- qib hlau ua ntej
HK-40 (0.35 - 0.45 % C) → rau tag nrho - lub zog sib tw welds siv lub siab -carbon variant E310H-16 / A432; siv E310-16 nkaus xwb rau kev txhim kho kev tsim kho qhov twg qhov tsis muaj zog me ntsis tau txais.
HP-Nb lossis tus qauv 310/310S/310H → E310-16 yog tus muab tub lim kom raug.
Kev npaj Bevel thiab Preheating
Npaj U-zoo li tus bevel (60℃nrog lub kaum sab xis, 2 hli hauv paus lub ntsej muag) siv machining lossis sib tsoo. Tshem tawm oxide nplai los ntawm cov cheeb tsam txuas ntxiv 25 hli ntawm ob sab ntawm lub bevel kom txog rau thaum cov xim hlau raug nthuav tawm. Preheat rau 100-150℃kom tshem tawm cov dej noo, raws li HK-40 castings nqus dej noo thaum ua haujlwm; cov kauj ruam ua ntej yuav raug tshem tawm tsuas yog rau cov kav dej tshiab.
Tam sim no, polarity thiab vuam dhau ib ntus
| Txoj kab uas hla | DCEP amperage (5G / 6G yeeb nkab txoj haujlwm) |
|---|---|
| Ø 2.5 hli | 60 – 90 A |
| Ø 3.2 hli | 75 – 110 A |
| Ø 4.0 hli | 95 – 150 A |
- Redry electrodes 250 - 350℃× 1 h; khaws cia hauv 80-150℃quiver.
- DCEPnyiam; luv arc,stringer hlaws nkaus xwb(weaving <2 × electrode txoj kab uas hla).
- Interpass kub Tsawg dua los yog sib npaug li 150 degree- E310-16 weld hlau yog tag nrho austenitic (FN ≈ 0) thiab kub-kawg rhiab heev yog lub pas dej ua ke loj.
Tshaj tawm - kev tshuaj xyuas vuam
100% PT (dye penetrant testing) yog ua rau ntawm lub hau thiab cov hauv paus hniav, thiab RT (radiographic test) yog ua rau cov pob qij txha tseem ceeb heev. Post-weld heat treatment (PWHT) tsis ua; E310-16 filler hlau yog siv nyob rau hauv raws li -welded mob, raws li PWHT yuav induce sigma-theem embrittlement.
FAQ
Q: Kuv puas tuaj yeem siv E309-16 hloov?
A: Tsis yog E309-16 (23Cr-13Ni, oxidation txwv ~ 1000 degree) yuav scale sai ntawm HK-40 kev pab kub. Ib txwm phim nrog 25Cr-20Ni tsev neeg.
Q: Thaum twg kuv yuav tsum siv E310H-16 hloov E310-16?
A: Thaum lub raj yog HK-40 (siab C) thiab qhov sib koom ua ke yuav tsum nqa tag nrho creep- tawg lub zog ntawm 1000+℃- qib H muaj C tsawg dua lossis sib npaug li 0.45 % piv rau lub hauv paus cam khwb cia.
Q: Puas yog E310-16 xav tau preheat?
A: Tsuas yog 100 - 150℃kom tshem tawm cov dej noo; tsis muaj metallurgical preheat yuav tsum tau.
