Flash taub qab vuam yog cov txheej txheem siv dav hauv kev tsim khoom thiab kev tsim kho kev lag luam rau kev koom nrog hlau. Nws suav nrog kev siv cov tam sim no siab thiab siab los tsim kom muaj zog, ruaj khov ntawm ob daim hlau. Ib qho tseem ceeb ntawm cov txheej txheem flash pob tw yog preheating, uas plays lub luag haujlwm tseem ceeb hauv kev ua tiav welds zoo. Nyob rau hauv tsab xov xwm no, peb yuav tshawb txog qhov tseem ceeb ntawm preheating thiab nws cov teebmeem ntawm qhov zoo thiab kev ncaj ncees ntawm flash butt welds.
Preheating yog tus txheej txheem ntawm kev nce qhov kub ntawm cov ntaub ntawv yuav tsum tau welded ua ntej qhov tseeb vuam ua hauj lwm. Nws feem ntau yog ua los ntawm cov cua kub induction, cov nplaim hluav taws xob, lossis cov txheej txheem cua sov. Lub hom phiaj tseem ceeb ntawm preheating hauv flash butt vuam yog kom txo cov thermal stresses thiab kub sib txawv uas yuav tshwm sim thaum lub vuam txheej txheem.
- Txo kev ntxhov siab: Preheating pab txo cov kev ntxhov siab sab hauv hauv cov khoom siv welded. Thaum cov hlau yog kub ceev thaum vuam, lawv nthuav, thiab thaum lawv txias, lawv cog lus. Qhov kev nthuav dav sai sai no tuaj yeem ua rau muaj kev ntxhov siab nyob hauv qhov sib koom ua ke. Preheating tso cai rau kev hloov pauv hloov pauv ntau dua, txo qhov kev pheej hmoo ntawm kev tawg thiab cuam tshuam hauv cov welded daim.
- Txhim kho cov khoom ntws: Thaum lub sij hawm flash taub qab vuam, cov ntaub ntawv raug mob siab thiab tam sim no, ua rau lawv ua tau zoo heev. Preheating softens cov ntaub ntawv, ua rau lawv ntau ductile thiab txhawb cov ntaub ntawv zoo dua. Qhov kev txhim kho cov khoom siv no ua kom ntseeg tau tias cov hlau fuse ua ke zoo, tsim kom muaj kev ruaj ntseg thiab txhim khu kev qha.
- Txo Hardening thiab Brittleness: Cov cua txias sai sai tom qab vuam tuaj yeem ua rau muaj qhov nyuaj thiab nkig microstructures hauv qhov sib koom ua ke. Preheating slows tus txheej txheem txias, tso cai rau tsim cov softer thiab ntau ductile microstructures. Qhov no, nyob rau hauv lem, txhim khu lub zuag qhia tag nrho toughness thiab ductility ntawm weld, txo qhov kev pheej hmoo ntawm tawg thiab tsis ua hauj lwm.
- Corrosion Resistance: Preheating kuj tuaj yeem muaj qhov cuam tshuam zoo rau kev tiv thaiv corrosion ntawm qhov sib koom ua ke. Los ntawm kev txhawb nqa kev tsim ntawm ib qho kev sib txuam ntau dua thiab tsis tshua muaj nkig, preheating pab txo qhov cuam tshuam ntawm kev sib koom ua ke rau corrosion thiab lwm yam ntaub ntawv ntawm cov khoom degradation.
Nyob rau hauv xaus, preheating yog ib qho tseem ceeb kauj ruam nyob rau hauv flash pob tw welding, raws li nws pab txhawb rau tag nrho cov zoo thiab kev ncaj ncees ntawm lub vuam. Los ntawm kev txo cov kev ntxhov siab sab hauv, txhim kho cov khoom ntws, txo qis hardening thiab brittleness, thiab txhim kho corrosion kuj, preheating xyuas kom meej tias cov welded sib koom ua tau raws li qhov yuav tsum tau muaj kev ua tau zoo thiab durability. Welders thiab manufacturers yuav tsum ua tib zoo xav txog cov kev ntsuas preheating kom ua tiav flash pob tw welds hauv ntau daim ntawv thov.
Post lub sij hawm: Oct-27-2023
