Nkag siab Flange Vuam-Raws Li Cracking: Ua thiab Tiv Thaiv
Taw qhia:
Flange welding yog ib qho tseem ceeb hauv kev tsim cov khoom siv lub nkoj siab. Thaum lub sij hawm vuam ntawm flanges, koj tuaj yeem ntsib ntau hom kev tawg, uas yuav tsis nyob ntawm qhov vuam nws tus kheej. Hauv kev sib tham no, peb yuav tshawb txog ntau hom kab nrib pleb uas tuaj yeem tshwm sim hauv flanges thaum lub sij hawm vuam thiab delve rau hauv yam uas ua rau lawv tsim. Kev nkag siab txog cov teeb meem no yog qhov tseem ceeb rau kev tiv thaiv thiab tswj cov teeb meem zoo li no.
Hom Cracks hauv Flange Vuam:
1. Kub Cracking:
Kub tawg yog hais txog cov kab nrib pleb uas tsim nyob rau hauv cov hlau thaum lub sij hawm vuam txheej txheem ntawm siab kub. Nws feem ntau tshwm sim nyob rau hauv cov hlau ntawm lub vuam, uas tuaj yeem muab faib ua peb hom subtypes: solidification (liquation) tawg, liquation tawg, thiab polygonization tawg. Cov kab nrib pleb yog feem ntau pom muaj nyob rau hauv ib-theem austenitic stainless hlau, carbon steels nrog ntau dua impurity ntsiab (S, P, Si, thiab C), thiab lwm yam vuam qauv. Cov yam tseem ceeb uas cuam tshuam rau cov kab nrib pleb muaj xws li qib ntawm weld overheating (txheej txheem txheej txheem), qis-melting eutectics nyob rau hauv cov hlau weld, thiab vuam tensile stresses.
2. Reheat Cracking:
Reheat cracking feem ntau tshwm sim nyob rau hauv cov qib steel thiab high-temperature alloys uas muaj nag lossis daus-strengthening ntsiab. Cov kab nrib pleb no tsis pom tam sim ntawd tom qab vuam tab sis txhim kho thaum cov txheej txheem kho cua sov tom qab. Ib txoj hauv kev los tiv thaiv reheat cracking yog siv cov khoom zoo-grained steel.
3. Txias Cracking:
Txias tawg feem ntau tshwm sim nyob rau hauv qhov kub-kho cheeb tsam ntawm siab mus rau nruab nrab carbon steel, qis mus rau nruab nrab alloy steel, thiab, nyob rau hauv tej rooj plaub, super high-strength steel, titanium, thiab titanium alloys. Feem ntau, steel qhov kev xav kom tawv, cov ntsiab lus hydrogen, thiab kev faib tawm hauv qhov sib koom ua ke, thiab lub xeev txwv ntawm kev sib koom ua ke, yog peb yam tseem ceeb uas ua rau muaj kev sib tsoo txias. Kev tsim cov kab mob khaub thuas feem ntau tshwm sim los ntawm txoj kev sib tshuam los yog transgranular thiab tuaj yeem faib ua cov kab nrib pleb, ntiv taw tawg, lossis cov kab nrib pleb.
Kev Tiv Thaiv thiab Tswj Kev Cracking:
Tiv thaiv thiab tswj cov kab nrib pleb uas muaj feem xyuam nrog kev sib tsoo, tshwj xeeb tshaj yog qhov txias txias, tuaj yeem ua tau los ntawm peb qhov tseem ceeb: xaiv cov khoom siv, kev ntsuas txheej txheem, thiab cov tswv yim tiv thaiv.
1. Kev xaiv cov khoom siv:
- Xaiv qhov qis hydrogen vuam rods rau txo hydrogen embrittlement.
- Siv cov ntaub ntawv uas muaj zog tsawg thaum ua haujlwm nrog cov qib steel uas ua rau txias tawg.
- Xav txog kev siv cov ntaub ntawv austenitic muab tub lim rau cov ntaub ntawv uas muaj lub siab txias txias.
2. Cov txheej txheem ntsuas:
- Siv cov cuab yeej siv hluav taws xob tsawg-tsawg vuam siv los txo cov cua sov kom tsawg.
- Siv preheating thiab tom qab vuam kev kho cua sov raws li qhov tsim nyog rau cov khoom siv.
- Txo qhov kev txwv nyob rau hauv kev sib koom ua ke kom txo tau cov kev ntxhov siab seem.
- Xaiv cov txheej txheem vuam tsim nyog thiab cov txheej txheem los txo qhov kev pheej hmoo ntawm kub tawg.
3. Cov tswv yim tiv thaiv:
- Xyuas kom huv huv ntawm lub hauv paus thiab cov ntaub ntawv muab tub lim.
- Txheeb xyuas qhov tsis muaj noo noo lossis cov khoom paug thaum lub sijhawm vuam.
- Xav txog kev hloov kho qhov tsim thiab cov txheej txheem vuam kom txo qis cov ntsiab lus kev ntxhov siab.
Xaus:
Vuam cuam tshuam txog kev tawg hauv flanges yog ib qho kev txhawj xeeb tseem ceeb hauv kev tsim cov khoom siv hluav taws xob. Los ntawm kev nkag siab txog ntau yam ntawm cov kab nrib pleb thiab cov yam ntxwv ua rau lawv tsim, nws muaj peev xwm ua kom muaj kev tiv thaiv zoo thiab kev tswj hwm kev ntsuas. Kev xaiv cov khoom tsim nyog, cov txheej txheem ntsuas, thiab cov tswv yim tiv thaiv tuaj yeem sib sau ua ke txo qhov kev pheej hmoo ntawm kev tawg, ua kom muaj kev ncaj ncees thiab kev ntseeg siab ntawm flange welds.
SINO SPECIAL METAL yog lub chaw tsim khoom muaj koob npe ntawm cov kav dej, flanges, thiab fittings. Peb zoo siab tos txais koj cov lus nug thiab muab cov khoom lag luam zoo raws li koj qhov kev xav tau tshwj xeeb. Tiv tauj peb kom paub ntau ntxiv thiab kev pabcuam kev yuav khoom.
